3067 lines
85 KiB
Go
3067 lines
85 KiB
Go
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Transport code.
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package http2
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import (
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"bufio"
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"bytes"
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"compress/gzip"
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"context"
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"crypto/rand"
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"crypto/tls"
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"errors"
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"fmt"
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"io"
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"log"
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"math"
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mathrand "math/rand"
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"net"
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"net/http"
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"net/http/httptrace"
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"net/textproto"
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"os"
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"sort"
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"strconv"
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"strings"
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"sync"
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"sync/atomic"
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"time"
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"golang.org/x/net/http/httpguts"
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"golang.org/x/net/http2/hpack"
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"golang.org/x/net/idna"
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)
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const (
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// transportDefaultConnFlow is how many connection-level flow control
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// tokens we give the server at start-up, past the default 64k.
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transportDefaultConnFlow = 1 << 30
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// transportDefaultStreamFlow is how many stream-level flow
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// control tokens we announce to the peer, and how many bytes
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// we buffer per stream.
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transportDefaultStreamFlow = 4 << 20
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// transportDefaultStreamMinRefresh is the minimum number of bytes we'll send
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// a stream-level WINDOW_UPDATE for at a time.
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transportDefaultStreamMinRefresh = 4 << 10
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defaultUserAgent = "Go-http-client/2.0"
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// initialMaxConcurrentStreams is a connections maxConcurrentStreams until
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// it's received servers initial SETTINGS frame, which corresponds with the
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// spec's minimum recommended value.
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initialMaxConcurrentStreams = 100
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// defaultMaxConcurrentStreams is a connections default maxConcurrentStreams
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// if the server doesn't include one in its initial SETTINGS frame.
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defaultMaxConcurrentStreams = 1000
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)
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// Transport is an HTTP/2 Transport.
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//
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// A Transport internally caches connections to servers. It is safe
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// for concurrent use by multiple goroutines.
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type Transport struct {
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// DialTLSContext specifies an optional dial function with context for
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// creating TLS connections for requests.
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//
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// If DialTLSContext and DialTLS is nil, tls.Dial is used.
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//
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// If the returned net.Conn has a ConnectionState method like tls.Conn,
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// it will be used to set http.Response.TLS.
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DialTLSContext func(ctx context.Context, network, addr string, cfg *tls.Config) (net.Conn, error)
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// DialTLS specifies an optional dial function for creating
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// TLS connections for requests.
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//
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// If DialTLSContext and DialTLS is nil, tls.Dial is used.
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//
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// Deprecated: Use DialTLSContext instead, which allows the transport
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// to cancel dials as soon as they are no longer needed.
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// If both are set, DialTLSContext takes priority.
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DialTLS func(network, addr string, cfg *tls.Config) (net.Conn, error)
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// TLSClientConfig specifies the TLS configuration to use with
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// tls.Client. If nil, the default configuration is used.
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TLSClientConfig *tls.Config
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// ConnPool optionally specifies an alternate connection pool to use.
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// If nil, the default is used.
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ConnPool ClientConnPool
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// DisableCompression, if true, prevents the Transport from
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// requesting compression with an "Accept-Encoding: gzip"
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// request header when the Request contains no existing
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// Accept-Encoding value. If the Transport requests gzip on
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// its own and gets a gzipped response, it's transparently
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// decoded in the Response.Body. However, if the user
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// explicitly requested gzip it is not automatically
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// uncompressed.
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DisableCompression bool
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// AllowHTTP, if true, permits HTTP/2 requests using the insecure,
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// plain-text "http" scheme. Note that this does not enable h2c support.
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AllowHTTP bool
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// MaxHeaderListSize is the http2 SETTINGS_MAX_HEADER_LIST_SIZE to
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// send in the initial settings frame. It is how many bytes
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// of response headers are allowed. Unlike the http2 spec, zero here
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// means to use a default limit (currently 10MB). If you actually
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// want to advertise an unlimited value to the peer, Transport
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// interprets the highest possible value here (0xffffffff or 1<<32-1)
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// to mean no limit.
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MaxHeaderListSize uint32
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// StrictMaxConcurrentStreams controls whether the server's
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// SETTINGS_MAX_CONCURRENT_STREAMS should be respected
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// globally. If false, new TCP connections are created to the
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// server as needed to keep each under the per-connection
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// SETTINGS_MAX_CONCURRENT_STREAMS limit. If true, the
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// server's SETTINGS_MAX_CONCURRENT_STREAMS is interpreted as
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// a global limit and callers of RoundTrip block when needed,
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// waiting for their turn.
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StrictMaxConcurrentStreams bool
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// ReadIdleTimeout is the timeout after which a health check using ping
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// frame will be carried out if no frame is received on the connection.
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// Note that a ping response will is considered a received frame, so if
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// there is no other traffic on the connection, the health check will
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// be performed every ReadIdleTimeout interval.
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// If zero, no health check is performed.
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ReadIdleTimeout time.Duration
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// PingTimeout is the timeout after which the connection will be closed
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// if a response to Ping is not received.
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// Defaults to 15s.
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PingTimeout time.Duration
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// WriteByteTimeout is the timeout after which the connection will be
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// closed no data can be written to it. The timeout begins when data is
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// available to write, and is extended whenever any bytes are written.
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WriteByteTimeout time.Duration
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// CountError, if non-nil, is called on HTTP/2 transport errors.
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// It's intended to increment a metric for monitoring, such
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// as an expvar or Prometheus metric.
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// The errType consists of only ASCII word characters.
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CountError func(errType string)
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// t1, if non-nil, is the standard library Transport using
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// this transport. Its settings are used (but not its
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// RoundTrip method, etc).
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t1 *http.Transport
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connPoolOnce sync.Once
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connPoolOrDef ClientConnPool // non-nil version of ConnPool
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}
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func (t *Transport) maxHeaderListSize() uint32 {
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if t.MaxHeaderListSize == 0 {
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return 10 << 20
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}
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if t.MaxHeaderListSize == 0xffffffff {
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return 0
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}
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return t.MaxHeaderListSize
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}
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func (t *Transport) disableCompression() bool {
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return t.DisableCompression || (t.t1 != nil && t.t1.DisableCompression)
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}
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func (t *Transport) pingTimeout() time.Duration {
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if t.PingTimeout == 0 {
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return 15 * time.Second
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}
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return t.PingTimeout
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}
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// ConfigureTransport configures a net/http HTTP/1 Transport to use HTTP/2.
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// It returns an error if t1 has already been HTTP/2-enabled.
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//
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// Use ConfigureTransports instead to configure the HTTP/2 Transport.
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func ConfigureTransport(t1 *http.Transport) error {
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_, err := ConfigureTransports(t1)
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return err
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}
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// ConfigureTransports configures a net/http HTTP/1 Transport to use HTTP/2.
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// It returns a new HTTP/2 Transport for further configuration.
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// It returns an error if t1 has already been HTTP/2-enabled.
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func ConfigureTransports(t1 *http.Transport) (*Transport, error) {
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return configureTransports(t1)
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}
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func configureTransports(t1 *http.Transport) (*Transport, error) {
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connPool := new(clientConnPool)
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t2 := &Transport{
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ConnPool: noDialClientConnPool{connPool},
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t1: t1,
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}
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connPool.t = t2
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if err := registerHTTPSProtocol(t1, noDialH2RoundTripper{t2}); err != nil {
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return nil, err
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}
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if t1.TLSClientConfig == nil {
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t1.TLSClientConfig = new(tls.Config)
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}
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if !strSliceContains(t1.TLSClientConfig.NextProtos, "h2") {
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t1.TLSClientConfig.NextProtos = append([]string{"h2"}, t1.TLSClientConfig.NextProtos...)
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}
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if !strSliceContains(t1.TLSClientConfig.NextProtos, "http/1.1") {
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t1.TLSClientConfig.NextProtos = append(t1.TLSClientConfig.NextProtos, "http/1.1")
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}
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upgradeFn := func(authority string, c *tls.Conn) http.RoundTripper {
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addr := authorityAddr("https", authority)
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if used, err := connPool.addConnIfNeeded(addr, t2, c); err != nil {
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go c.Close()
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return erringRoundTripper{err}
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} else if !used {
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// Turns out we don't need this c.
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// For example, two goroutines made requests to the same host
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// at the same time, both kicking off TCP dials. (since protocol
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// was unknown)
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go c.Close()
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}
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return t2
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}
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if m := t1.TLSNextProto; len(m) == 0 {
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t1.TLSNextProto = map[string]func(string, *tls.Conn) http.RoundTripper{
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"h2": upgradeFn,
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}
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} else {
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m["h2"] = upgradeFn
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}
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return t2, nil
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}
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func (t *Transport) connPool() ClientConnPool {
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t.connPoolOnce.Do(t.initConnPool)
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return t.connPoolOrDef
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}
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func (t *Transport) initConnPool() {
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if t.ConnPool != nil {
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t.connPoolOrDef = t.ConnPool
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} else {
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t.connPoolOrDef = &clientConnPool{t: t}
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}
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}
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// ClientConn is the state of a single HTTP/2 client connection to an
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// HTTP/2 server.
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type ClientConn struct {
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t *Transport
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tconn net.Conn // usually *tls.Conn, except specialized impls
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tlsState *tls.ConnectionState // nil only for specialized impls
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reused uint32 // whether conn is being reused; atomic
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singleUse bool // whether being used for a single http.Request
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getConnCalled bool // used by clientConnPool
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// readLoop goroutine fields:
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readerDone chan struct{} // closed on error
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readerErr error // set before readerDone is closed
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idleTimeout time.Duration // or 0 for never
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idleTimer *time.Timer
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mu sync.Mutex // guards following
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cond *sync.Cond // hold mu; broadcast on flow/closed changes
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flow flow // our conn-level flow control quota (cs.flow is per stream)
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inflow flow // peer's conn-level flow control
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doNotReuse bool // whether conn is marked to not be reused for any future requests
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closing bool
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closed bool
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seenSettings bool // true if we've seen a settings frame, false otherwise
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wantSettingsAck bool // we sent a SETTINGS frame and haven't heard back
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goAway *GoAwayFrame // if non-nil, the GoAwayFrame we received
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goAwayDebug string // goAway frame's debug data, retained as a string
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streams map[uint32]*clientStream // client-initiated
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streamsReserved int // incr by ReserveNewRequest; decr on RoundTrip
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nextStreamID uint32
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pendingRequests int // requests blocked and waiting to be sent because len(streams) == maxConcurrentStreams
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pings map[[8]byte]chan struct{} // in flight ping data to notification channel
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br *bufio.Reader
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lastActive time.Time
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lastIdle time.Time // time last idle
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// Settings from peer: (also guarded by wmu)
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maxFrameSize uint32
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maxConcurrentStreams uint32
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peerMaxHeaderListSize uint64
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initialWindowSize uint32
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// reqHeaderMu is a 1-element semaphore channel controlling access to sending new requests.
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// Write to reqHeaderMu to lock it, read from it to unlock.
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// Lock reqmu BEFORE mu or wmu.
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reqHeaderMu chan struct{}
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// wmu is held while writing.
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// Acquire BEFORE mu when holding both, to avoid blocking mu on network writes.
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// Only acquire both at the same time when changing peer settings.
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wmu sync.Mutex
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bw *bufio.Writer
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fr *Framer
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werr error // first write error that has occurred
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hbuf bytes.Buffer // HPACK encoder writes into this
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henc *hpack.Encoder
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}
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// clientStream is the state for a single HTTP/2 stream. One of these
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// is created for each Transport.RoundTrip call.
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type clientStream struct {
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cc *ClientConn
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// Fields of Request that we may access even after the response body is closed.
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ctx context.Context
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reqCancel <-chan struct{}
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trace *httptrace.ClientTrace // or nil
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ID uint32
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bufPipe pipe // buffered pipe with the flow-controlled response payload
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requestedGzip bool
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isHead bool
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abortOnce sync.Once
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abort chan struct{} // closed to signal stream should end immediately
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abortErr error // set if abort is closed
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peerClosed chan struct{} // closed when the peer sends an END_STREAM flag
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donec chan struct{} // closed after the stream is in the closed state
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on100 chan struct{} // buffered; written to if a 100 is received
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respHeaderRecv chan struct{} // closed when headers are received
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res *http.Response // set if respHeaderRecv is closed
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flow flow // guarded by cc.mu
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inflow flow // guarded by cc.mu
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bytesRemain int64 // -1 means unknown; owned by transportResponseBody.Read
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readErr error // sticky read error; owned by transportResponseBody.Read
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reqBody io.ReadCloser
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reqBodyContentLength int64 // -1 means unknown
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reqBodyClosed bool // body has been closed; guarded by cc.mu
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// owned by writeRequest:
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sentEndStream bool // sent an END_STREAM flag to the peer
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sentHeaders bool
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// owned by clientConnReadLoop:
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firstByte bool // got the first response byte
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pastHeaders bool // got first MetaHeadersFrame (actual headers)
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pastTrailers bool // got optional second MetaHeadersFrame (trailers)
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num1xx uint8 // number of 1xx responses seen
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readClosed bool // peer sent an END_STREAM flag
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readAborted bool // read loop reset the stream
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trailer http.Header // accumulated trailers
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resTrailer *http.Header // client's Response.Trailer
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}
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var got1xxFuncForTests func(int, textproto.MIMEHeader) error
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// get1xxTraceFunc returns the value of request's httptrace.ClientTrace.Got1xxResponse func,
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// if any. It returns nil if not set or if the Go version is too old.
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func (cs *clientStream) get1xxTraceFunc() func(int, textproto.MIMEHeader) error {
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if fn := got1xxFuncForTests; fn != nil {
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return fn
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}
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return traceGot1xxResponseFunc(cs.trace)
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}
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func (cs *clientStream) abortStream(err error) {
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cs.cc.mu.Lock()
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defer cs.cc.mu.Unlock()
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cs.abortStreamLocked(err)
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}
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func (cs *clientStream) abortStreamLocked(err error) {
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cs.abortOnce.Do(func() {
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cs.abortErr = err
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close(cs.abort)
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})
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if cs.reqBody != nil && !cs.reqBodyClosed {
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cs.reqBody.Close()
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cs.reqBodyClosed = true
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}
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// TODO(dneil): Clean up tests where cs.cc.cond is nil.
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if cs.cc.cond != nil {
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// Wake up writeRequestBody if it is waiting on flow control.
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cs.cc.cond.Broadcast()
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}
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}
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func (cs *clientStream) abortRequestBodyWrite() {
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cc := cs.cc
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cc.mu.Lock()
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defer cc.mu.Unlock()
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if cs.reqBody != nil && !cs.reqBodyClosed {
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cs.reqBody.Close()
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cs.reqBodyClosed = true
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cc.cond.Broadcast()
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}
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}
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type stickyErrWriter struct {
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conn net.Conn
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timeout time.Duration
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err *error
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}
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func (sew stickyErrWriter) Write(p []byte) (n int, err error) {
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if *sew.err != nil {
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return 0, *sew.err
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}
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for {
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if sew.timeout != 0 {
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sew.conn.SetWriteDeadline(time.Now().Add(sew.timeout))
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}
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nn, err := sew.conn.Write(p[n:])
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n += nn
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if n < len(p) && nn > 0 && errors.Is(err, os.ErrDeadlineExceeded) {
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// Keep extending the deadline so long as we're making progress.
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continue
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}
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if sew.timeout != 0 {
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sew.conn.SetWriteDeadline(time.Time{})
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}
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*sew.err = err
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return n, err
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}
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}
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// noCachedConnError is the concrete type of ErrNoCachedConn, which
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// needs to be detected by net/http regardless of whether it's its
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// bundled version (in h2_bundle.go with a rewritten type name) or
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// from a user's x/net/http2. As such, as it has a unique method name
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// (IsHTTP2NoCachedConnError) that net/http sniffs for via func
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// isNoCachedConnError.
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type noCachedConnError struct{}
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func (noCachedConnError) IsHTTP2NoCachedConnError() {}
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func (noCachedConnError) Error() string { return "http2: no cached connection was available" }
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// isNoCachedConnError reports whether err is of type noCachedConnError
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// or its equivalent renamed type in net/http2's h2_bundle.go. Both types
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// may coexist in the same running program.
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func isNoCachedConnError(err error) bool {
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_, ok := err.(interface{ IsHTTP2NoCachedConnError() })
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return ok
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}
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var ErrNoCachedConn error = noCachedConnError{}
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// RoundTripOpt are options for the Transport.RoundTripOpt method.
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type RoundTripOpt struct {
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// OnlyCachedConn controls whether RoundTripOpt may
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// create a new TCP connection. If set true and
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// no cached connection is available, RoundTripOpt
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// will return ErrNoCachedConn.
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OnlyCachedConn bool
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}
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func (t *Transport) RoundTrip(req *http.Request) (*http.Response, error) {
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return t.RoundTripOpt(req, RoundTripOpt{})
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}
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// authorityAddr returns a given authority (a host/IP, or host:port / ip:port)
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// and returns a host:port. The port 443 is added if needed.
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func authorityAddr(scheme string, authority string) (addr string) {
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host, port, err := net.SplitHostPort(authority)
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if err != nil { // authority didn't have a port
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port = "443"
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if scheme == "http" {
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port = "80"
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}
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host = authority
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}
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if a, err := idna.ToASCII(host); err == nil {
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host = a
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}
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// IPv6 address literal, without a port:
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if strings.HasPrefix(host, "[") && strings.HasSuffix(host, "]") {
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return host + ":" + port
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}
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return net.JoinHostPort(host, port)
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}
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// RoundTripOpt is like RoundTrip, but takes options.
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func (t *Transport) RoundTripOpt(req *http.Request, opt RoundTripOpt) (*http.Response, error) {
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if !(req.URL.Scheme == "https" || (req.URL.Scheme == "http" && t.AllowHTTP)) {
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return nil, errors.New("http2: unsupported scheme")
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}
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|
addr := authorityAddr(req.URL.Scheme, req.URL.Host)
|
|
for retry := 0; ; retry++ {
|
|
cc, err := t.connPool().GetClientConn(req, addr)
|
|
if err != nil {
|
|
t.vlogf("http2: Transport failed to get client conn for %s: %v", addr, err)
|
|
return nil, err
|
|
}
|
|
reused := !atomic.CompareAndSwapUint32(&cc.reused, 0, 1)
|
|
traceGotConn(req, cc, reused)
|
|
res, err := cc.RoundTrip(req)
|
|
if err != nil && retry <= 6 {
|
|
if req, err = shouldRetryRequest(req, err); err == nil {
|
|
// After the first retry, do exponential backoff with 10% jitter.
|
|
if retry == 0 {
|
|
t.vlogf("RoundTrip retrying after failure: %v", err)
|
|
continue
|
|
}
|
|
backoff := float64(uint(1) << (uint(retry) - 1))
|
|
backoff += backoff * (0.1 * mathrand.Float64())
|
|
select {
|
|
case <-time.After(time.Second * time.Duration(backoff)):
|
|
t.vlogf("RoundTrip retrying after failure: %v", err)
|
|
continue
|
|
case <-req.Context().Done():
|
|
err = req.Context().Err()
|
|
}
|
|
}
|
|
}
|
|
if err != nil {
|
|
t.vlogf("RoundTrip failure: %v", err)
|
|
return nil, err
|
|
}
|
|
return res, nil
|
|
}
|
|
}
|
|
|
|
// CloseIdleConnections closes any connections which were previously
|
|
// connected from previous requests but are now sitting idle.
|
|
// It does not interrupt any connections currently in use.
|
|
func (t *Transport) CloseIdleConnections() {
|
|
if cp, ok := t.connPool().(clientConnPoolIdleCloser); ok {
|
|
cp.closeIdleConnections()
|
|
}
|
|
}
|
|
|
|
var (
|
|
errClientConnClosed = errors.New("http2: client conn is closed")
|
|
errClientConnUnusable = errors.New("http2: client conn not usable")
|
|
errClientConnGotGoAway = errors.New("http2: Transport received Server's graceful shutdown GOAWAY")
|
|
)
|
|
|
|
// shouldRetryRequest is called by RoundTrip when a request fails to get
|
|
// response headers. It is always called with a non-nil error.
|
|
// It returns either a request to retry (either the same request, or a
|
|
// modified clone), or an error if the request can't be replayed.
|
|
func shouldRetryRequest(req *http.Request, err error) (*http.Request, error) {
|
|
if !canRetryError(err) {
|
|
return nil, err
|
|
}
|
|
// If the Body is nil (or http.NoBody), it's safe to reuse
|
|
// this request and its Body.
|
|
if req.Body == nil || req.Body == http.NoBody {
|
|
return req, nil
|
|
}
|
|
|
|
// If the request body can be reset back to its original
|
|
// state via the optional req.GetBody, do that.
|
|
if req.GetBody != nil {
|
|
body, err := req.GetBody()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
newReq := *req
|
|
newReq.Body = body
|
|
return &newReq, nil
|
|
}
|
|
|
|
// The Request.Body can't reset back to the beginning, but we
|
|
// don't seem to have started to read from it yet, so reuse
|
|
// the request directly.
|
|
if err == errClientConnUnusable {
|
|
return req, nil
|
|
}
|
|
|
|
return nil, fmt.Errorf("http2: Transport: cannot retry err [%v] after Request.Body was written; define Request.GetBody to avoid this error", err)
|
|
}
|
|
|
|
func canRetryError(err error) bool {
|
|
if err == errClientConnUnusable || err == errClientConnGotGoAway {
|
|
return true
|
|
}
|
|
if se, ok := err.(StreamError); ok {
|
|
if se.Code == ErrCodeProtocol && se.Cause == errFromPeer {
|
|
// See golang/go#47635, golang/go#42777
|
|
return true
|
|
}
|
|
return se.Code == ErrCodeRefusedStream
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (t *Transport) dialClientConn(ctx context.Context, addr string, singleUse bool) (*ClientConn, error) {
|
|
host, _, err := net.SplitHostPort(addr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
tconn, err := t.dialTLS(ctx, "tcp", addr, t.newTLSConfig(host))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return t.newClientConn(tconn, singleUse)
|
|
}
|
|
|
|
func (t *Transport) newTLSConfig(host string) *tls.Config {
|
|
cfg := new(tls.Config)
|
|
if t.TLSClientConfig != nil {
|
|
*cfg = *t.TLSClientConfig.Clone()
|
|
}
|
|
if !strSliceContains(cfg.NextProtos, NextProtoTLS) {
|
|
cfg.NextProtos = append([]string{NextProtoTLS}, cfg.NextProtos...)
|
|
}
|
|
if cfg.ServerName == "" {
|
|
cfg.ServerName = host
|
|
}
|
|
return cfg
|
|
}
|
|
|
|
func (t *Transport) dialTLS(ctx context.Context, network, addr string, tlsCfg *tls.Config) (net.Conn, error) {
|
|
if t.DialTLSContext != nil {
|
|
return t.DialTLSContext(ctx, network, addr, tlsCfg)
|
|
} else if t.DialTLS != nil {
|
|
return t.DialTLS(network, addr, tlsCfg)
|
|
}
|
|
|
|
tlsCn, err := t.dialTLSWithContext(ctx, network, addr, tlsCfg)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
state := tlsCn.ConnectionState()
|
|
if p := state.NegotiatedProtocol; p != NextProtoTLS {
|
|
return nil, fmt.Errorf("http2: unexpected ALPN protocol %q; want %q", p, NextProtoTLS)
|
|
}
|
|
if !state.NegotiatedProtocolIsMutual {
|
|
return nil, errors.New("http2: could not negotiate protocol mutually")
|
|
}
|
|
return tlsCn, nil
|
|
}
|
|
|
|
// disableKeepAlives reports whether connections should be closed as
|
|
// soon as possible after handling the first request.
|
|
func (t *Transport) disableKeepAlives() bool {
|
|
return t.t1 != nil && t.t1.DisableKeepAlives
|
|
}
|
|
|
|
func (t *Transport) expectContinueTimeout() time.Duration {
|
|
if t.t1 == nil {
|
|
return 0
|
|
}
|
|
return t.t1.ExpectContinueTimeout
|
|
}
|
|
|
|
func (t *Transport) NewClientConn(c net.Conn) (*ClientConn, error) {
|
|
return t.newClientConn(c, t.disableKeepAlives())
|
|
}
|
|
|
|
func (t *Transport) newClientConn(c net.Conn, singleUse bool) (*ClientConn, error) {
|
|
cc := &ClientConn{
|
|
t: t,
|
|
tconn: c,
|
|
readerDone: make(chan struct{}),
|
|
nextStreamID: 1,
|
|
maxFrameSize: 16 << 10, // spec default
|
|
initialWindowSize: 65535, // spec default
|
|
maxConcurrentStreams: initialMaxConcurrentStreams, // "infinite", per spec. Use a smaller value until we have received server settings.
|
|
peerMaxHeaderListSize: 0xffffffffffffffff, // "infinite", per spec. Use 2^64-1 instead.
|
|
streams: make(map[uint32]*clientStream),
|
|
singleUse: singleUse,
|
|
wantSettingsAck: true,
|
|
pings: make(map[[8]byte]chan struct{}),
|
|
reqHeaderMu: make(chan struct{}, 1),
|
|
}
|
|
if d := t.idleConnTimeout(); d != 0 {
|
|
cc.idleTimeout = d
|
|
cc.idleTimer = time.AfterFunc(d, cc.onIdleTimeout)
|
|
}
|
|
if VerboseLogs {
|
|
t.vlogf("http2: Transport creating client conn %p to %v", cc, c.RemoteAddr())
|
|
}
|
|
|
|
cc.cond = sync.NewCond(&cc.mu)
|
|
cc.flow.add(int32(initialWindowSize))
|
|
|
|
// TODO: adjust this writer size to account for frame size +
|
|
// MTU + crypto/tls record padding.
|
|
cc.bw = bufio.NewWriter(stickyErrWriter{
|
|
conn: c,
|
|
timeout: t.WriteByteTimeout,
|
|
err: &cc.werr,
|
|
})
|
|
cc.br = bufio.NewReader(c)
|
|
cc.fr = NewFramer(cc.bw, cc.br)
|
|
if t.CountError != nil {
|
|
cc.fr.countError = t.CountError
|
|
}
|
|
cc.fr.ReadMetaHeaders = hpack.NewDecoder(initialHeaderTableSize, nil)
|
|
cc.fr.MaxHeaderListSize = t.maxHeaderListSize()
|
|
|
|
// TODO: SetMaxDynamicTableSize, SetMaxDynamicTableSizeLimit on
|
|
// henc in response to SETTINGS frames?
|
|
cc.henc = hpack.NewEncoder(&cc.hbuf)
|
|
|
|
if t.AllowHTTP {
|
|
cc.nextStreamID = 3
|
|
}
|
|
|
|
if cs, ok := c.(connectionStater); ok {
|
|
state := cs.ConnectionState()
|
|
cc.tlsState = &state
|
|
}
|
|
|
|
initialSettings := []Setting{
|
|
{ID: SettingEnablePush, Val: 0},
|
|
{ID: SettingInitialWindowSize, Val: transportDefaultStreamFlow},
|
|
}
|
|
if max := t.maxHeaderListSize(); max != 0 {
|
|
initialSettings = append(initialSettings, Setting{ID: SettingMaxHeaderListSize, Val: max})
|
|
}
|
|
|
|
cc.bw.Write(clientPreface)
|
|
cc.fr.WriteSettings(initialSettings...)
|
|
cc.fr.WriteWindowUpdate(0, transportDefaultConnFlow)
|
|
cc.inflow.add(transportDefaultConnFlow + initialWindowSize)
|
|
cc.bw.Flush()
|
|
if cc.werr != nil {
|
|
cc.Close()
|
|
return nil, cc.werr
|
|
}
|
|
|
|
go cc.readLoop()
|
|
return cc, nil
|
|
}
|
|
|
|
func (cc *ClientConn) healthCheck() {
|
|
pingTimeout := cc.t.pingTimeout()
|
|
// We don't need to periodically ping in the health check, because the readLoop of ClientConn will
|
|
// trigger the healthCheck again if there is no frame received.
|
|
ctx, cancel := context.WithTimeout(context.Background(), pingTimeout)
|
|
defer cancel()
|
|
cc.vlogf("http2: Transport sending health check")
|
|
err := cc.Ping(ctx)
|
|
if err != nil {
|
|
cc.vlogf("http2: Transport health check failure: %v", err)
|
|
cc.closeForLostPing()
|
|
} else {
|
|
cc.vlogf("http2: Transport health check success")
|
|
}
|
|
}
|
|
|
|
// SetDoNotReuse marks cc as not reusable for future HTTP requests.
|
|
func (cc *ClientConn) SetDoNotReuse() {
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
cc.doNotReuse = true
|
|
}
|
|
|
|
func (cc *ClientConn) setGoAway(f *GoAwayFrame) {
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
|
|
old := cc.goAway
|
|
cc.goAway = f
|
|
|
|
// Merge the previous and current GoAway error frames.
|
|
if cc.goAwayDebug == "" {
|
|
cc.goAwayDebug = string(f.DebugData())
|
|
}
|
|
if old != nil && old.ErrCode != ErrCodeNo {
|
|
cc.goAway.ErrCode = old.ErrCode
|
|
}
|
|
last := f.LastStreamID
|
|
for streamID, cs := range cc.streams {
|
|
if streamID > last {
|
|
cs.abortStreamLocked(errClientConnGotGoAway)
|
|
}
|
|
}
|
|
}
|
|
|
|
// CanTakeNewRequest reports whether the connection can take a new request,
|
|
// meaning it has not been closed or received or sent a GOAWAY.
|
|
//
|
|
// If the caller is going to immediately make a new request on this
|
|
// connection, use ReserveNewRequest instead.
|
|
func (cc *ClientConn) CanTakeNewRequest() bool {
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
return cc.canTakeNewRequestLocked()
|
|
}
|
|
|
|
// ReserveNewRequest is like CanTakeNewRequest but also reserves a
|
|
// concurrent stream in cc. The reservation is decremented on the
|
|
// next call to RoundTrip.
|
|
func (cc *ClientConn) ReserveNewRequest() bool {
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
if st := cc.idleStateLocked(); !st.canTakeNewRequest {
|
|
return false
|
|
}
|
|
cc.streamsReserved++
|
|
return true
|
|
}
|
|
|
|
// ClientConnState describes the state of a ClientConn.
|
|
type ClientConnState struct {
|
|
// Closed is whether the connection is closed.
|
|
Closed bool
|
|
|
|
// Closing is whether the connection is in the process of
|
|
// closing. It may be closing due to shutdown, being a
|
|
// single-use connection, being marked as DoNotReuse, or
|
|
// having received a GOAWAY frame.
|
|
Closing bool
|
|
|
|
// StreamsActive is how many streams are active.
|
|
StreamsActive int
|
|
|
|
// StreamsReserved is how many streams have been reserved via
|
|
// ClientConn.ReserveNewRequest.
|
|
StreamsReserved int
|
|
|
|
// StreamsPending is how many requests have been sent in excess
|
|
// of the peer's advertised MaxConcurrentStreams setting and
|
|
// are waiting for other streams to complete.
|
|
StreamsPending int
|
|
|
|
// MaxConcurrentStreams is how many concurrent streams the
|
|
// peer advertised as acceptable. Zero means no SETTINGS
|
|
// frame has been received yet.
|
|
MaxConcurrentStreams uint32
|
|
|
|
// LastIdle, if non-zero, is when the connection last
|
|
// transitioned to idle state.
|
|
LastIdle time.Time
|
|
}
|
|
|
|
// State returns a snapshot of cc's state.
|
|
func (cc *ClientConn) State() ClientConnState {
|
|
cc.wmu.Lock()
|
|
maxConcurrent := cc.maxConcurrentStreams
|
|
if !cc.seenSettings {
|
|
maxConcurrent = 0
|
|
}
|
|
cc.wmu.Unlock()
|
|
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
return ClientConnState{
|
|
Closed: cc.closed,
|
|
Closing: cc.closing || cc.singleUse || cc.doNotReuse || cc.goAway != nil,
|
|
StreamsActive: len(cc.streams),
|
|
StreamsReserved: cc.streamsReserved,
|
|
StreamsPending: cc.pendingRequests,
|
|
LastIdle: cc.lastIdle,
|
|
MaxConcurrentStreams: maxConcurrent,
|
|
}
|
|
}
|
|
|
|
// clientConnIdleState describes the suitability of a client
|
|
// connection to initiate a new RoundTrip request.
|
|
type clientConnIdleState struct {
|
|
canTakeNewRequest bool
|
|
}
|
|
|
|
func (cc *ClientConn) idleState() clientConnIdleState {
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
return cc.idleStateLocked()
|
|
}
|
|
|
|
func (cc *ClientConn) idleStateLocked() (st clientConnIdleState) {
|
|
if cc.singleUse && cc.nextStreamID > 1 {
|
|
return
|
|
}
|
|
var maxConcurrentOkay bool
|
|
if cc.t.StrictMaxConcurrentStreams {
|
|
// We'll tell the caller we can take a new request to
|
|
// prevent the caller from dialing a new TCP
|
|
// connection, but then we'll block later before
|
|
// writing it.
|
|
maxConcurrentOkay = true
|
|
} else {
|
|
maxConcurrentOkay = int64(len(cc.streams)+cc.streamsReserved+1) <= int64(cc.maxConcurrentStreams)
|
|
}
|
|
|
|
st.canTakeNewRequest = cc.goAway == nil && !cc.closed && !cc.closing && maxConcurrentOkay &&
|
|
!cc.doNotReuse &&
|
|
int64(cc.nextStreamID)+2*int64(cc.pendingRequests) < math.MaxInt32 &&
|
|
!cc.tooIdleLocked()
|
|
return
|
|
}
|
|
|
|
func (cc *ClientConn) canTakeNewRequestLocked() bool {
|
|
st := cc.idleStateLocked()
|
|
return st.canTakeNewRequest
|
|
}
|
|
|
|
// tooIdleLocked reports whether this connection has been been sitting idle
|
|
// for too much wall time.
|
|
func (cc *ClientConn) tooIdleLocked() bool {
|
|
// The Round(0) strips the monontonic clock reading so the
|
|
// times are compared based on their wall time. We don't want
|
|
// to reuse a connection that's been sitting idle during
|
|
// VM/laptop suspend if monotonic time was also frozen.
|
|
return cc.idleTimeout != 0 && !cc.lastIdle.IsZero() && time.Since(cc.lastIdle.Round(0)) > cc.idleTimeout
|
|
}
|
|
|
|
// onIdleTimeout is called from a time.AfterFunc goroutine. It will
|
|
// only be called when we're idle, but because we're coming from a new
|
|
// goroutine, there could be a new request coming in at the same time,
|
|
// so this simply calls the synchronized closeIfIdle to shut down this
|
|
// connection. The timer could just call closeIfIdle, but this is more
|
|
// clear.
|
|
func (cc *ClientConn) onIdleTimeout() {
|
|
cc.closeIfIdle()
|
|
}
|
|
|
|
func (cc *ClientConn) closeConn() error {
|
|
t := time.AfterFunc(250*time.Millisecond, cc.forceCloseConn)
|
|
defer t.Stop()
|
|
return cc.tconn.Close()
|
|
}
|
|
|
|
// A tls.Conn.Close can hang for a long time if the peer is unresponsive.
|
|
// Try to shut it down more aggressively.
|
|
func (cc *ClientConn) forceCloseConn() {
|
|
tc, ok := cc.tconn.(*tls.Conn)
|
|
if !ok {
|
|
return
|
|
}
|
|
if nc := tlsUnderlyingConn(tc); nc != nil {
|
|
nc.Close()
|
|
}
|
|
}
|
|
|
|
func (cc *ClientConn) closeIfIdle() {
|
|
cc.mu.Lock()
|
|
if len(cc.streams) > 0 || cc.streamsReserved > 0 {
|
|
cc.mu.Unlock()
|
|
return
|
|
}
|
|
cc.closed = true
|
|
nextID := cc.nextStreamID
|
|
// TODO: do clients send GOAWAY too? maybe? Just Close:
|
|
cc.mu.Unlock()
|
|
|
|
if VerboseLogs {
|
|
cc.vlogf("http2: Transport closing idle conn %p (forSingleUse=%v, maxStream=%v)", cc, cc.singleUse, nextID-2)
|
|
}
|
|
cc.closeConn()
|
|
}
|
|
|
|
func (cc *ClientConn) isDoNotReuseAndIdle() bool {
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
return cc.doNotReuse && len(cc.streams) == 0
|
|
}
|
|
|
|
var shutdownEnterWaitStateHook = func() {}
|
|
|
|
// Shutdown gracefully closes the client connection, waiting for running streams to complete.
|
|
func (cc *ClientConn) Shutdown(ctx context.Context) error {
|
|
if err := cc.sendGoAway(); err != nil {
|
|
return err
|
|
}
|
|
// Wait for all in-flight streams to complete or connection to close
|
|
done := make(chan struct{})
|
|
cancelled := false // guarded by cc.mu
|
|
go func() {
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
for {
|
|
if len(cc.streams) == 0 || cc.closed {
|
|
cc.closed = true
|
|
close(done)
|
|
break
|
|
}
|
|
if cancelled {
|
|
break
|
|
}
|
|
cc.cond.Wait()
|
|
}
|
|
}()
|
|
shutdownEnterWaitStateHook()
|
|
select {
|
|
case <-done:
|
|
return cc.closeConn()
|
|
case <-ctx.Done():
|
|
cc.mu.Lock()
|
|
// Free the goroutine above
|
|
cancelled = true
|
|
cc.cond.Broadcast()
|
|
cc.mu.Unlock()
|
|
return ctx.Err()
|
|
}
|
|
}
|
|
|
|
func (cc *ClientConn) sendGoAway() error {
|
|
cc.mu.Lock()
|
|
closing := cc.closing
|
|
cc.closing = true
|
|
maxStreamID := cc.nextStreamID
|
|
cc.mu.Unlock()
|
|
if closing {
|
|
// GOAWAY sent already
|
|
return nil
|
|
}
|
|
|
|
cc.wmu.Lock()
|
|
defer cc.wmu.Unlock()
|
|
// Send a graceful shutdown frame to server
|
|
if err := cc.fr.WriteGoAway(maxStreamID, ErrCodeNo, nil); err != nil {
|
|
return err
|
|
}
|
|
if err := cc.bw.Flush(); err != nil {
|
|
return err
|
|
}
|
|
// Prevent new requests
|
|
return nil
|
|
}
|
|
|
|
// closes the client connection immediately. In-flight requests are interrupted.
|
|
// err is sent to streams.
|
|
func (cc *ClientConn) closeForError(err error) error {
|
|
cc.mu.Lock()
|
|
cc.closed = true
|
|
for _, cs := range cc.streams {
|
|
cs.abortStreamLocked(err)
|
|
}
|
|
cc.cond.Broadcast()
|
|
cc.mu.Unlock()
|
|
return cc.closeConn()
|
|
}
|
|
|
|
// Close closes the client connection immediately.
|
|
//
|
|
// In-flight requests are interrupted. For a graceful shutdown, use Shutdown instead.
|
|
func (cc *ClientConn) Close() error {
|
|
err := errors.New("http2: client connection force closed via ClientConn.Close")
|
|
return cc.closeForError(err)
|
|
}
|
|
|
|
// closes the client connection immediately. In-flight requests are interrupted.
|
|
func (cc *ClientConn) closeForLostPing() error {
|
|
err := errors.New("http2: client connection lost")
|
|
if f := cc.t.CountError; f != nil {
|
|
f("conn_close_lost_ping")
|
|
}
|
|
return cc.closeForError(err)
|
|
}
|
|
|
|
// errRequestCanceled is a copy of net/http's errRequestCanceled because it's not
|
|
// exported. At least they'll be DeepEqual for h1-vs-h2 comparisons tests.
|
|
var errRequestCanceled = errors.New("net/http: request canceled")
|
|
|
|
func commaSeparatedTrailers(req *http.Request) (string, error) {
|
|
keys := make([]string, 0, len(req.Trailer))
|
|
for k := range req.Trailer {
|
|
k = http.CanonicalHeaderKey(k)
|
|
switch k {
|
|
case "Transfer-Encoding", "Trailer", "Content-Length":
|
|
return "", fmt.Errorf("invalid Trailer key %q", k)
|
|
}
|
|
keys = append(keys, k)
|
|
}
|
|
if len(keys) > 0 {
|
|
sort.Strings(keys)
|
|
return strings.Join(keys, ","), nil
|
|
}
|
|
return "", nil
|
|
}
|
|
|
|
func (cc *ClientConn) responseHeaderTimeout() time.Duration {
|
|
if cc.t.t1 != nil {
|
|
return cc.t.t1.ResponseHeaderTimeout
|
|
}
|
|
// No way to do this (yet?) with just an http2.Transport. Probably
|
|
// no need. Request.Cancel this is the new way. We only need to support
|
|
// this for compatibility with the old http.Transport fields when
|
|
// we're doing transparent http2.
|
|
return 0
|
|
}
|
|
|
|
// checkConnHeaders checks whether req has any invalid connection-level headers.
|
|
// per RFC 7540 section 8.1.2.2: Connection-Specific Header Fields.
|
|
// Certain headers are special-cased as okay but not transmitted later.
|
|
func checkConnHeaders(req *http.Request) error {
|
|
if v := req.Header.Get("Upgrade"); v != "" {
|
|
return fmt.Errorf("http2: invalid Upgrade request header: %q", req.Header["Upgrade"])
|
|
}
|
|
if vv := req.Header["Transfer-Encoding"]; len(vv) > 0 && (len(vv) > 1 || vv[0] != "" && vv[0] != "chunked") {
|
|
return fmt.Errorf("http2: invalid Transfer-Encoding request header: %q", vv)
|
|
}
|
|
if vv := req.Header["Connection"]; len(vv) > 0 && (len(vv) > 1 || vv[0] != "" && !asciiEqualFold(vv[0], "close") && !asciiEqualFold(vv[0], "keep-alive")) {
|
|
return fmt.Errorf("http2: invalid Connection request header: %q", vv)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// actualContentLength returns a sanitized version of
|
|
// req.ContentLength, where 0 actually means zero (not unknown) and -1
|
|
// means unknown.
|
|
func actualContentLength(req *http.Request) int64 {
|
|
if req.Body == nil || req.Body == http.NoBody {
|
|
return 0
|
|
}
|
|
if req.ContentLength != 0 {
|
|
return req.ContentLength
|
|
}
|
|
return -1
|
|
}
|
|
|
|
func (cc *ClientConn) decrStreamReservations() {
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
cc.decrStreamReservationsLocked()
|
|
}
|
|
|
|
func (cc *ClientConn) decrStreamReservationsLocked() {
|
|
if cc.streamsReserved > 0 {
|
|
cc.streamsReserved--
|
|
}
|
|
}
|
|
|
|
func (cc *ClientConn) RoundTrip(req *http.Request) (*http.Response, error) {
|
|
ctx := req.Context()
|
|
cs := &clientStream{
|
|
cc: cc,
|
|
ctx: ctx,
|
|
reqCancel: req.Cancel,
|
|
isHead: req.Method == "HEAD",
|
|
reqBody: req.Body,
|
|
reqBodyContentLength: actualContentLength(req),
|
|
trace: httptrace.ContextClientTrace(ctx),
|
|
peerClosed: make(chan struct{}),
|
|
abort: make(chan struct{}),
|
|
respHeaderRecv: make(chan struct{}),
|
|
donec: make(chan struct{}),
|
|
}
|
|
go cs.doRequest(req)
|
|
|
|
waitDone := func() error {
|
|
select {
|
|
case <-cs.donec:
|
|
return nil
|
|
case <-ctx.Done():
|
|
return ctx.Err()
|
|
case <-cs.reqCancel:
|
|
return errRequestCanceled
|
|
}
|
|
}
|
|
|
|
handleResponseHeaders := func() (*http.Response, error) {
|
|
res := cs.res
|
|
if res.StatusCode > 299 {
|
|
// On error or status code 3xx, 4xx, 5xx, etc abort any
|
|
// ongoing write, assuming that the server doesn't care
|
|
// about our request body. If the server replied with 1xx or
|
|
// 2xx, however, then assume the server DOES potentially
|
|
// want our body (e.g. full-duplex streaming:
|
|
// golang.org/issue/13444). If it turns out the server
|
|
// doesn't, they'll RST_STREAM us soon enough. This is a
|
|
// heuristic to avoid adding knobs to Transport. Hopefully
|
|
// we can keep it.
|
|
cs.abortRequestBodyWrite()
|
|
}
|
|
res.Request = req
|
|
res.TLS = cc.tlsState
|
|
if res.Body == noBody && actualContentLength(req) == 0 {
|
|
// If there isn't a request or response body still being
|
|
// written, then wait for the stream to be closed before
|
|
// RoundTrip returns.
|
|
if err := waitDone(); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
return res, nil
|
|
}
|
|
|
|
for {
|
|
select {
|
|
case <-cs.respHeaderRecv:
|
|
return handleResponseHeaders()
|
|
case <-cs.abort:
|
|
select {
|
|
case <-cs.respHeaderRecv:
|
|
// If both cs.respHeaderRecv and cs.abort are signaling,
|
|
// pick respHeaderRecv. The server probably wrote the
|
|
// response and immediately reset the stream.
|
|
// golang.org/issue/49645
|
|
return handleResponseHeaders()
|
|
default:
|
|
waitDone()
|
|
return nil, cs.abortErr
|
|
}
|
|
case <-ctx.Done():
|
|
err := ctx.Err()
|
|
cs.abortStream(err)
|
|
return nil, err
|
|
case <-cs.reqCancel:
|
|
cs.abortStream(errRequestCanceled)
|
|
return nil, errRequestCanceled
|
|
}
|
|
}
|
|
}
|
|
|
|
// doRequest runs for the duration of the request lifetime.
|
|
//
|
|
// It sends the request and performs post-request cleanup (closing Request.Body, etc.).
|
|
func (cs *clientStream) doRequest(req *http.Request) {
|
|
err := cs.writeRequest(req)
|
|
cs.cleanupWriteRequest(err)
|
|
}
|
|
|
|
// writeRequest sends a request.
|
|
//
|
|
// It returns nil after the request is written, the response read,
|
|
// and the request stream is half-closed by the peer.
|
|
//
|
|
// It returns non-nil if the request ends otherwise.
|
|
// If the returned error is StreamError, the error Code may be used in resetting the stream.
|
|
func (cs *clientStream) writeRequest(req *http.Request) (err error) {
|
|
cc := cs.cc
|
|
ctx := cs.ctx
|
|
|
|
if err := checkConnHeaders(req); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Acquire the new-request lock by writing to reqHeaderMu.
|
|
// This lock guards the critical section covering allocating a new stream ID
|
|
// (requires mu) and creating the stream (requires wmu).
|
|
if cc.reqHeaderMu == nil {
|
|
panic("RoundTrip on uninitialized ClientConn") // for tests
|
|
}
|
|
select {
|
|
case cc.reqHeaderMu <- struct{}{}:
|
|
case <-cs.reqCancel:
|
|
return errRequestCanceled
|
|
case <-ctx.Done():
|
|
return ctx.Err()
|
|
}
|
|
|
|
cc.mu.Lock()
|
|
if cc.idleTimer != nil {
|
|
cc.idleTimer.Stop()
|
|
}
|
|
cc.decrStreamReservationsLocked()
|
|
if err := cc.awaitOpenSlotForStreamLocked(cs); err != nil {
|
|
cc.mu.Unlock()
|
|
<-cc.reqHeaderMu
|
|
return err
|
|
}
|
|
cc.addStreamLocked(cs) // assigns stream ID
|
|
if isConnectionCloseRequest(req) {
|
|
cc.doNotReuse = true
|
|
}
|
|
cc.mu.Unlock()
|
|
|
|
// TODO(bradfitz): this is a copy of the logic in net/http. Unify somewhere?
|
|
if !cc.t.disableCompression() &&
|
|
req.Header.Get("Accept-Encoding") == "" &&
|
|
req.Header.Get("Range") == "" &&
|
|
!cs.isHead {
|
|
// Request gzip only, not deflate. Deflate is ambiguous and
|
|
// not as universally supported anyway.
|
|
// See: https://zlib.net/zlib_faq.html#faq39
|
|
//
|
|
// Note that we don't request this for HEAD requests,
|
|
// due to a bug in nginx:
|
|
// http://trac.nginx.org/nginx/ticket/358
|
|
// https://golang.org/issue/5522
|
|
//
|
|
// We don't request gzip if the request is for a range, since
|
|
// auto-decoding a portion of a gzipped document will just fail
|
|
// anyway. See https://golang.org/issue/8923
|
|
cs.requestedGzip = true
|
|
}
|
|
|
|
continueTimeout := cc.t.expectContinueTimeout()
|
|
if continueTimeout != 0 {
|
|
if !httpguts.HeaderValuesContainsToken(req.Header["Expect"], "100-continue") {
|
|
continueTimeout = 0
|
|
} else {
|
|
cs.on100 = make(chan struct{}, 1)
|
|
}
|
|
}
|
|
|
|
// Past this point (where we send request headers), it is possible for
|
|
// RoundTrip to return successfully. Since the RoundTrip contract permits
|
|
// the caller to "mutate or reuse" the Request after closing the Response's Body,
|
|
// we must take care when referencing the Request from here on.
|
|
err = cs.encodeAndWriteHeaders(req)
|
|
<-cc.reqHeaderMu
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
hasBody := cs.reqBodyContentLength != 0
|
|
if !hasBody {
|
|
cs.sentEndStream = true
|
|
} else {
|
|
if continueTimeout != 0 {
|
|
traceWait100Continue(cs.trace)
|
|
timer := time.NewTimer(continueTimeout)
|
|
select {
|
|
case <-timer.C:
|
|
err = nil
|
|
case <-cs.on100:
|
|
err = nil
|
|
case <-cs.abort:
|
|
err = cs.abortErr
|
|
case <-ctx.Done():
|
|
err = ctx.Err()
|
|
case <-cs.reqCancel:
|
|
err = errRequestCanceled
|
|
}
|
|
timer.Stop()
|
|
if err != nil {
|
|
traceWroteRequest(cs.trace, err)
|
|
return err
|
|
}
|
|
}
|
|
|
|
if err = cs.writeRequestBody(req); err != nil {
|
|
if err != errStopReqBodyWrite {
|
|
traceWroteRequest(cs.trace, err)
|
|
return err
|
|
}
|
|
} else {
|
|
cs.sentEndStream = true
|
|
}
|
|
}
|
|
|
|
traceWroteRequest(cs.trace, err)
|
|
|
|
var respHeaderTimer <-chan time.Time
|
|
var respHeaderRecv chan struct{}
|
|
if d := cc.responseHeaderTimeout(); d != 0 {
|
|
timer := time.NewTimer(d)
|
|
defer timer.Stop()
|
|
respHeaderTimer = timer.C
|
|
respHeaderRecv = cs.respHeaderRecv
|
|
}
|
|
// Wait until the peer half-closes its end of the stream,
|
|
// or until the request is aborted (via context, error, or otherwise),
|
|
// whichever comes first.
|
|
for {
|
|
select {
|
|
case <-cs.peerClosed:
|
|
return nil
|
|
case <-respHeaderTimer:
|
|
return errTimeout
|
|
case <-respHeaderRecv:
|
|
respHeaderRecv = nil
|
|
respHeaderTimer = nil // keep waiting for END_STREAM
|
|
case <-cs.abort:
|
|
return cs.abortErr
|
|
case <-ctx.Done():
|
|
return ctx.Err()
|
|
case <-cs.reqCancel:
|
|
return errRequestCanceled
|
|
}
|
|
}
|
|
}
|
|
|
|
func (cs *clientStream) encodeAndWriteHeaders(req *http.Request) error {
|
|
cc := cs.cc
|
|
ctx := cs.ctx
|
|
|
|
cc.wmu.Lock()
|
|
defer cc.wmu.Unlock()
|
|
|
|
// If the request was canceled while waiting for cc.mu, just quit.
|
|
select {
|
|
case <-cs.abort:
|
|
return cs.abortErr
|
|
case <-ctx.Done():
|
|
return ctx.Err()
|
|
case <-cs.reqCancel:
|
|
return errRequestCanceled
|
|
default:
|
|
}
|
|
|
|
// Encode headers.
|
|
//
|
|
// we send: HEADERS{1}, CONTINUATION{0,} + DATA{0,} (DATA is
|
|
// sent by writeRequestBody below, along with any Trailers,
|
|
// again in form HEADERS{1}, CONTINUATION{0,})
|
|
trailers, err := commaSeparatedTrailers(req)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
hasTrailers := trailers != ""
|
|
contentLen := actualContentLength(req)
|
|
hasBody := contentLen != 0
|
|
hdrs, err := cc.encodeHeaders(req, cs.requestedGzip, trailers, contentLen)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Write the request.
|
|
endStream := !hasBody && !hasTrailers
|
|
cs.sentHeaders = true
|
|
err = cc.writeHeaders(cs.ID, endStream, int(cc.maxFrameSize), hdrs)
|
|
traceWroteHeaders(cs.trace)
|
|
return err
|
|
}
|
|
|
|
// cleanupWriteRequest performs post-request tasks.
|
|
//
|
|
// If err (the result of writeRequest) is non-nil and the stream is not closed,
|
|
// cleanupWriteRequest will send a reset to the peer.
|
|
func (cs *clientStream) cleanupWriteRequest(err error) {
|
|
cc := cs.cc
|
|
|
|
if cs.ID == 0 {
|
|
// We were canceled before creating the stream, so return our reservation.
|
|
cc.decrStreamReservations()
|
|
}
|
|
|
|
// TODO: write h12Compare test showing whether
|
|
// Request.Body is closed by the Transport,
|
|
// and in multiple cases: server replies <=299 and >299
|
|
// while still writing request body
|
|
cc.mu.Lock()
|
|
bodyClosed := cs.reqBodyClosed
|
|
cs.reqBodyClosed = true
|
|
cc.mu.Unlock()
|
|
if !bodyClosed && cs.reqBody != nil {
|
|
cs.reqBody.Close()
|
|
}
|
|
|
|
if err != nil && cs.sentEndStream {
|
|
// If the connection is closed immediately after the response is read,
|
|
// we may be aborted before finishing up here. If the stream was closed
|
|
// cleanly on both sides, there is no error.
|
|
select {
|
|
case <-cs.peerClosed:
|
|
err = nil
|
|
default:
|
|
}
|
|
}
|
|
if err != nil {
|
|
cs.abortStream(err) // possibly redundant, but harmless
|
|
if cs.sentHeaders {
|
|
if se, ok := err.(StreamError); ok {
|
|
if se.Cause != errFromPeer {
|
|
cc.writeStreamReset(cs.ID, se.Code, err)
|
|
}
|
|
} else {
|
|
cc.writeStreamReset(cs.ID, ErrCodeCancel, err)
|
|
}
|
|
}
|
|
cs.bufPipe.CloseWithError(err) // no-op if already closed
|
|
} else {
|
|
if cs.sentHeaders && !cs.sentEndStream {
|
|
cc.writeStreamReset(cs.ID, ErrCodeNo, nil)
|
|
}
|
|
cs.bufPipe.CloseWithError(errRequestCanceled)
|
|
}
|
|
if cs.ID != 0 {
|
|
cc.forgetStreamID(cs.ID)
|
|
}
|
|
|
|
cc.wmu.Lock()
|
|
werr := cc.werr
|
|
cc.wmu.Unlock()
|
|
if werr != nil {
|
|
cc.Close()
|
|
}
|
|
|
|
close(cs.donec)
|
|
}
|
|
|
|
// awaitOpenSlotForStream waits until len(streams) < maxConcurrentStreams.
|
|
// Must hold cc.mu.
|
|
func (cc *ClientConn) awaitOpenSlotForStreamLocked(cs *clientStream) error {
|
|
for {
|
|
cc.lastActive = time.Now()
|
|
if cc.closed || !cc.canTakeNewRequestLocked() {
|
|
return errClientConnUnusable
|
|
}
|
|
cc.lastIdle = time.Time{}
|
|
if int64(len(cc.streams)) < int64(cc.maxConcurrentStreams) {
|
|
return nil
|
|
}
|
|
cc.pendingRequests++
|
|
cc.cond.Wait()
|
|
cc.pendingRequests--
|
|
select {
|
|
case <-cs.abort:
|
|
return cs.abortErr
|
|
default:
|
|
}
|
|
}
|
|
}
|
|
|
|
// requires cc.wmu be held
|
|
func (cc *ClientConn) writeHeaders(streamID uint32, endStream bool, maxFrameSize int, hdrs []byte) error {
|
|
first := true // first frame written (HEADERS is first, then CONTINUATION)
|
|
for len(hdrs) > 0 && cc.werr == nil {
|
|
chunk := hdrs
|
|
if len(chunk) > maxFrameSize {
|
|
chunk = chunk[:maxFrameSize]
|
|
}
|
|
hdrs = hdrs[len(chunk):]
|
|
endHeaders := len(hdrs) == 0
|
|
if first {
|
|
cc.fr.WriteHeaders(HeadersFrameParam{
|
|
StreamID: streamID,
|
|
BlockFragment: chunk,
|
|
EndStream: endStream,
|
|
EndHeaders: endHeaders,
|
|
})
|
|
first = false
|
|
} else {
|
|
cc.fr.WriteContinuation(streamID, endHeaders, chunk)
|
|
}
|
|
}
|
|
cc.bw.Flush()
|
|
return cc.werr
|
|
}
|
|
|
|
// internal error values; they don't escape to callers
|
|
var (
|
|
// abort request body write; don't send cancel
|
|
errStopReqBodyWrite = errors.New("http2: aborting request body write")
|
|
|
|
// abort request body write, but send stream reset of cancel.
|
|
errStopReqBodyWriteAndCancel = errors.New("http2: canceling request")
|
|
|
|
errReqBodyTooLong = errors.New("http2: request body larger than specified content length")
|
|
)
|
|
|
|
// frameScratchBufferLen returns the length of a buffer to use for
|
|
// outgoing request bodies to read/write to/from.
|
|
//
|
|
// It returns max(1, min(peer's advertised max frame size,
|
|
// Request.ContentLength+1, 512KB)).
|
|
func (cs *clientStream) frameScratchBufferLen(maxFrameSize int) int {
|
|
const max = 512 << 10
|
|
n := int64(maxFrameSize)
|
|
if n > max {
|
|
n = max
|
|
}
|
|
if cl := cs.reqBodyContentLength; cl != -1 && cl+1 < n {
|
|
// Add an extra byte past the declared content-length to
|
|
// give the caller's Request.Body io.Reader a chance to
|
|
// give us more bytes than they declared, so we can catch it
|
|
// early.
|
|
n = cl + 1
|
|
}
|
|
if n < 1 {
|
|
return 1
|
|
}
|
|
return int(n) // doesn't truncate; max is 512K
|
|
}
|
|
|
|
var bufPool sync.Pool // of *[]byte
|
|
|
|
func (cs *clientStream) writeRequestBody(req *http.Request) (err error) {
|
|
cc := cs.cc
|
|
body := cs.reqBody
|
|
sentEnd := false // whether we sent the final DATA frame w/ END_STREAM
|
|
|
|
hasTrailers := req.Trailer != nil
|
|
remainLen := cs.reqBodyContentLength
|
|
hasContentLen := remainLen != -1
|
|
|
|
cc.mu.Lock()
|
|
maxFrameSize := int(cc.maxFrameSize)
|
|
cc.mu.Unlock()
|
|
|
|
// Scratch buffer for reading into & writing from.
|
|
scratchLen := cs.frameScratchBufferLen(maxFrameSize)
|
|
var buf []byte
|
|
if bp, ok := bufPool.Get().(*[]byte); ok && len(*bp) >= scratchLen {
|
|
defer bufPool.Put(bp)
|
|
buf = *bp
|
|
} else {
|
|
buf = make([]byte, scratchLen)
|
|
defer bufPool.Put(&buf)
|
|
}
|
|
|
|
var sawEOF bool
|
|
for !sawEOF {
|
|
n, err := body.Read(buf[:len(buf)])
|
|
if hasContentLen {
|
|
remainLen -= int64(n)
|
|
if remainLen == 0 && err == nil {
|
|
// The request body's Content-Length was predeclared and
|
|
// we just finished reading it all, but the underlying io.Reader
|
|
// returned the final chunk with a nil error (which is one of
|
|
// the two valid things a Reader can do at EOF). Because we'd prefer
|
|
// to send the END_STREAM bit early, double-check that we're actually
|
|
// at EOF. Subsequent reads should return (0, EOF) at this point.
|
|
// If either value is different, we return an error in one of two ways below.
|
|
var scratch [1]byte
|
|
var n1 int
|
|
n1, err = body.Read(scratch[:])
|
|
remainLen -= int64(n1)
|
|
}
|
|
if remainLen < 0 {
|
|
err = errReqBodyTooLong
|
|
return err
|
|
}
|
|
}
|
|
if err != nil {
|
|
cc.mu.Lock()
|
|
bodyClosed := cs.reqBodyClosed
|
|
cc.mu.Unlock()
|
|
switch {
|
|
case bodyClosed:
|
|
return errStopReqBodyWrite
|
|
case err == io.EOF:
|
|
sawEOF = true
|
|
err = nil
|
|
default:
|
|
return err
|
|
}
|
|
}
|
|
|
|
remain := buf[:n]
|
|
for len(remain) > 0 && err == nil {
|
|
var allowed int32
|
|
allowed, err = cs.awaitFlowControl(len(remain))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
cc.wmu.Lock()
|
|
data := remain[:allowed]
|
|
remain = remain[allowed:]
|
|
sentEnd = sawEOF && len(remain) == 0 && !hasTrailers
|
|
err = cc.fr.WriteData(cs.ID, sentEnd, data)
|
|
if err == nil {
|
|
// TODO(bradfitz): this flush is for latency, not bandwidth.
|
|
// Most requests won't need this. Make this opt-in or
|
|
// opt-out? Use some heuristic on the body type? Nagel-like
|
|
// timers? Based on 'n'? Only last chunk of this for loop,
|
|
// unless flow control tokens are low? For now, always.
|
|
// If we change this, see comment below.
|
|
err = cc.bw.Flush()
|
|
}
|
|
cc.wmu.Unlock()
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
if sentEnd {
|
|
// Already sent END_STREAM (which implies we have no
|
|
// trailers) and flushed, because currently all
|
|
// WriteData frames above get a flush. So we're done.
|
|
return nil
|
|
}
|
|
|
|
// Since the RoundTrip contract permits the caller to "mutate or reuse"
|
|
// a request after the Response's Body is closed, verify that this hasn't
|
|
// happened before accessing the trailers.
|
|
cc.mu.Lock()
|
|
trailer := req.Trailer
|
|
err = cs.abortErr
|
|
cc.mu.Unlock()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
cc.wmu.Lock()
|
|
defer cc.wmu.Unlock()
|
|
var trls []byte
|
|
if len(trailer) > 0 {
|
|
trls, err = cc.encodeTrailers(trailer)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// Two ways to send END_STREAM: either with trailers, or
|
|
// with an empty DATA frame.
|
|
if len(trls) > 0 {
|
|
err = cc.writeHeaders(cs.ID, true, maxFrameSize, trls)
|
|
} else {
|
|
err = cc.fr.WriteData(cs.ID, true, nil)
|
|
}
|
|
if ferr := cc.bw.Flush(); ferr != nil && err == nil {
|
|
err = ferr
|
|
}
|
|
return err
|
|
}
|
|
|
|
// awaitFlowControl waits for [1, min(maxBytes, cc.cs.maxFrameSize)] flow
|
|
// control tokens from the server.
|
|
// It returns either the non-zero number of tokens taken or an error
|
|
// if the stream is dead.
|
|
func (cs *clientStream) awaitFlowControl(maxBytes int) (taken int32, err error) {
|
|
cc := cs.cc
|
|
ctx := cs.ctx
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
for {
|
|
if cc.closed {
|
|
return 0, errClientConnClosed
|
|
}
|
|
if cs.reqBodyClosed {
|
|
return 0, errStopReqBodyWrite
|
|
}
|
|
select {
|
|
case <-cs.abort:
|
|
return 0, cs.abortErr
|
|
case <-ctx.Done():
|
|
return 0, ctx.Err()
|
|
case <-cs.reqCancel:
|
|
return 0, errRequestCanceled
|
|
default:
|
|
}
|
|
if a := cs.flow.available(); a > 0 {
|
|
take := a
|
|
if int(take) > maxBytes {
|
|
|
|
take = int32(maxBytes) // can't truncate int; take is int32
|
|
}
|
|
if take > int32(cc.maxFrameSize) {
|
|
take = int32(cc.maxFrameSize)
|
|
}
|
|
cs.flow.take(take)
|
|
return take, nil
|
|
}
|
|
cc.cond.Wait()
|
|
}
|
|
}
|
|
|
|
var errNilRequestURL = errors.New("http2: Request.URI is nil")
|
|
|
|
// requires cc.wmu be held.
|
|
func (cc *ClientConn) encodeHeaders(req *http.Request, addGzipHeader bool, trailers string, contentLength int64) ([]byte, error) {
|
|
cc.hbuf.Reset()
|
|
if req.URL == nil {
|
|
return nil, errNilRequestURL
|
|
}
|
|
|
|
host := req.Host
|
|
if host == "" {
|
|
host = req.URL.Host
|
|
}
|
|
host, err := httpguts.PunycodeHostPort(host)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
var path string
|
|
if req.Method != "CONNECT" {
|
|
path = req.URL.RequestURI()
|
|
if !validPseudoPath(path) {
|
|
orig := path
|
|
path = strings.TrimPrefix(path, req.URL.Scheme+"://"+host)
|
|
if !validPseudoPath(path) {
|
|
if req.URL.Opaque != "" {
|
|
return nil, fmt.Errorf("invalid request :path %q from URL.Opaque = %q", orig, req.URL.Opaque)
|
|
} else {
|
|
return nil, fmt.Errorf("invalid request :path %q", orig)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Check for any invalid headers and return an error before we
|
|
// potentially pollute our hpack state. (We want to be able to
|
|
// continue to reuse the hpack encoder for future requests)
|
|
for k, vv := range req.Header {
|
|
if !httpguts.ValidHeaderFieldName(k) {
|
|
return nil, fmt.Errorf("invalid HTTP header name %q", k)
|
|
}
|
|
for _, v := range vv {
|
|
if !httpguts.ValidHeaderFieldValue(v) {
|
|
// Don't include the value in the error, because it may be sensitive.
|
|
return nil, fmt.Errorf("invalid HTTP header value for header %q", k)
|
|
}
|
|
}
|
|
}
|
|
|
|
enumerateHeaders := func(f func(name, value string)) {
|
|
// 8.1.2.3 Request Pseudo-Header Fields
|
|
// The :path pseudo-header field includes the path and query parts of the
|
|
// target URI (the path-absolute production and optionally a '?' character
|
|
// followed by the query production (see Sections 3.3 and 3.4 of
|
|
// [RFC3986]).
|
|
f(":authority", host)
|
|
m := req.Method
|
|
if m == "" {
|
|
m = http.MethodGet
|
|
}
|
|
f(":method", m)
|
|
if req.Method != "CONNECT" {
|
|
f(":path", path)
|
|
f(":scheme", req.URL.Scheme)
|
|
}
|
|
if trailers != "" {
|
|
f("trailer", trailers)
|
|
}
|
|
|
|
var didUA bool
|
|
for k, vv := range req.Header {
|
|
if asciiEqualFold(k, "host") || asciiEqualFold(k, "content-length") {
|
|
// Host is :authority, already sent.
|
|
// Content-Length is automatic, set below.
|
|
continue
|
|
} else if asciiEqualFold(k, "connection") ||
|
|
asciiEqualFold(k, "proxy-connection") ||
|
|
asciiEqualFold(k, "transfer-encoding") ||
|
|
asciiEqualFold(k, "upgrade") ||
|
|
asciiEqualFold(k, "keep-alive") {
|
|
// Per 8.1.2.2 Connection-Specific Header
|
|
// Fields, don't send connection-specific
|
|
// fields. We have already checked if any
|
|
// are error-worthy so just ignore the rest.
|
|
continue
|
|
} else if asciiEqualFold(k, "user-agent") {
|
|
// Match Go's http1 behavior: at most one
|
|
// User-Agent. If set to nil or empty string,
|
|
// then omit it. Otherwise if not mentioned,
|
|
// include the default (below).
|
|
didUA = true
|
|
if len(vv) < 1 {
|
|
continue
|
|
}
|
|
vv = vv[:1]
|
|
if vv[0] == "" {
|
|
continue
|
|
}
|
|
} else if asciiEqualFold(k, "cookie") {
|
|
// Per 8.1.2.5 To allow for better compression efficiency, the
|
|
// Cookie header field MAY be split into separate header fields,
|
|
// each with one or more cookie-pairs.
|
|
for _, v := range vv {
|
|
for {
|
|
p := strings.IndexByte(v, ';')
|
|
if p < 0 {
|
|
break
|
|
}
|
|
f("cookie", v[:p])
|
|
p++
|
|
// strip space after semicolon if any.
|
|
for p+1 <= len(v) && v[p] == ' ' {
|
|
p++
|
|
}
|
|
v = v[p:]
|
|
}
|
|
if len(v) > 0 {
|
|
f("cookie", v)
|
|
}
|
|
}
|
|
continue
|
|
}
|
|
|
|
for _, v := range vv {
|
|
f(k, v)
|
|
}
|
|
}
|
|
if shouldSendReqContentLength(req.Method, contentLength) {
|
|
f("content-length", strconv.FormatInt(contentLength, 10))
|
|
}
|
|
if addGzipHeader {
|
|
f("accept-encoding", "gzip")
|
|
}
|
|
if !didUA {
|
|
f("user-agent", defaultUserAgent)
|
|
}
|
|
}
|
|
|
|
// Do a first pass over the headers counting bytes to ensure
|
|
// we don't exceed cc.peerMaxHeaderListSize. This is done as a
|
|
// separate pass before encoding the headers to prevent
|
|
// modifying the hpack state.
|
|
hlSize := uint64(0)
|
|
enumerateHeaders(func(name, value string) {
|
|
hf := hpack.HeaderField{Name: name, Value: value}
|
|
hlSize += uint64(hf.Size())
|
|
})
|
|
|
|
if hlSize > cc.peerMaxHeaderListSize {
|
|
return nil, errRequestHeaderListSize
|
|
}
|
|
|
|
trace := httptrace.ContextClientTrace(req.Context())
|
|
traceHeaders := traceHasWroteHeaderField(trace)
|
|
|
|
// Header list size is ok. Write the headers.
|
|
enumerateHeaders(func(name, value string) {
|
|
name, ascii := asciiToLower(name)
|
|
if !ascii {
|
|
// Skip writing invalid headers. Per RFC 7540, Section 8.1.2, header
|
|
// field names have to be ASCII characters (just as in HTTP/1.x).
|
|
return
|
|
}
|
|
cc.writeHeader(name, value)
|
|
if traceHeaders {
|
|
traceWroteHeaderField(trace, name, value)
|
|
}
|
|
})
|
|
|
|
return cc.hbuf.Bytes(), nil
|
|
}
|
|
|
|
// shouldSendReqContentLength reports whether the http2.Transport should send
|
|
// a "content-length" request header. This logic is basically a copy of the net/http
|
|
// transferWriter.shouldSendContentLength.
|
|
// The contentLength is the corrected contentLength (so 0 means actually 0, not unknown).
|
|
// -1 means unknown.
|
|
func shouldSendReqContentLength(method string, contentLength int64) bool {
|
|
if contentLength > 0 {
|
|
return true
|
|
}
|
|
if contentLength < 0 {
|
|
return false
|
|
}
|
|
// For zero bodies, whether we send a content-length depends on the method.
|
|
// It also kinda doesn't matter for http2 either way, with END_STREAM.
|
|
switch method {
|
|
case "POST", "PUT", "PATCH":
|
|
return true
|
|
default:
|
|
return false
|
|
}
|
|
}
|
|
|
|
// requires cc.wmu be held.
|
|
func (cc *ClientConn) encodeTrailers(trailer http.Header) ([]byte, error) {
|
|
cc.hbuf.Reset()
|
|
|
|
hlSize := uint64(0)
|
|
for k, vv := range trailer {
|
|
for _, v := range vv {
|
|
hf := hpack.HeaderField{Name: k, Value: v}
|
|
hlSize += uint64(hf.Size())
|
|
}
|
|
}
|
|
if hlSize > cc.peerMaxHeaderListSize {
|
|
return nil, errRequestHeaderListSize
|
|
}
|
|
|
|
for k, vv := range trailer {
|
|
lowKey, ascii := asciiToLower(k)
|
|
if !ascii {
|
|
// Skip writing invalid headers. Per RFC 7540, Section 8.1.2, header
|
|
// field names have to be ASCII characters (just as in HTTP/1.x).
|
|
continue
|
|
}
|
|
// Transfer-Encoding, etc.. have already been filtered at the
|
|
// start of RoundTrip
|
|
for _, v := range vv {
|
|
cc.writeHeader(lowKey, v)
|
|
}
|
|
}
|
|
return cc.hbuf.Bytes(), nil
|
|
}
|
|
|
|
func (cc *ClientConn) writeHeader(name, value string) {
|
|
if VerboseLogs {
|
|
log.Printf("http2: Transport encoding header %q = %q", name, value)
|
|
}
|
|
cc.henc.WriteField(hpack.HeaderField{Name: name, Value: value})
|
|
}
|
|
|
|
type resAndError struct {
|
|
_ incomparable
|
|
res *http.Response
|
|
err error
|
|
}
|
|
|
|
// requires cc.mu be held.
|
|
func (cc *ClientConn) addStreamLocked(cs *clientStream) {
|
|
cs.flow.add(int32(cc.initialWindowSize))
|
|
cs.flow.setConnFlow(&cc.flow)
|
|
cs.inflow.add(transportDefaultStreamFlow)
|
|
cs.inflow.setConnFlow(&cc.inflow)
|
|
cs.ID = cc.nextStreamID
|
|
cc.nextStreamID += 2
|
|
cc.streams[cs.ID] = cs
|
|
if cs.ID == 0 {
|
|
panic("assigned stream ID 0")
|
|
}
|
|
}
|
|
|
|
func (cc *ClientConn) forgetStreamID(id uint32) {
|
|
cc.mu.Lock()
|
|
slen := len(cc.streams)
|
|
delete(cc.streams, id)
|
|
if len(cc.streams) != slen-1 {
|
|
panic("forgetting unknown stream id")
|
|
}
|
|
cc.lastActive = time.Now()
|
|
if len(cc.streams) == 0 && cc.idleTimer != nil {
|
|
cc.idleTimer.Reset(cc.idleTimeout)
|
|
cc.lastIdle = time.Now()
|
|
}
|
|
// Wake up writeRequestBody via clientStream.awaitFlowControl and
|
|
// wake up RoundTrip if there is a pending request.
|
|
cc.cond.Broadcast()
|
|
|
|
closeOnIdle := cc.singleUse || cc.doNotReuse || cc.t.disableKeepAlives()
|
|
if closeOnIdle && cc.streamsReserved == 0 && len(cc.streams) == 0 {
|
|
if VerboseLogs {
|
|
cc.vlogf("http2: Transport closing idle conn %p (forSingleUse=%v, maxStream=%v)", cc, cc.singleUse, cc.nextStreamID-2)
|
|
}
|
|
cc.closed = true
|
|
defer cc.closeConn()
|
|
}
|
|
|
|
cc.mu.Unlock()
|
|
}
|
|
|
|
// clientConnReadLoop is the state owned by the clientConn's frame-reading readLoop.
|
|
type clientConnReadLoop struct {
|
|
_ incomparable
|
|
cc *ClientConn
|
|
}
|
|
|
|
// readLoop runs in its own goroutine and reads and dispatches frames.
|
|
func (cc *ClientConn) readLoop() {
|
|
rl := &clientConnReadLoop{cc: cc}
|
|
defer rl.cleanup()
|
|
cc.readerErr = rl.run()
|
|
if ce, ok := cc.readerErr.(ConnectionError); ok {
|
|
cc.wmu.Lock()
|
|
cc.fr.WriteGoAway(0, ErrCode(ce), nil)
|
|
cc.wmu.Unlock()
|
|
}
|
|
}
|
|
|
|
// GoAwayError is returned by the Transport when the server closes the
|
|
// TCP connection after sending a GOAWAY frame.
|
|
type GoAwayError struct {
|
|
LastStreamID uint32
|
|
ErrCode ErrCode
|
|
DebugData string
|
|
}
|
|
|
|
func (e GoAwayError) Error() string {
|
|
return fmt.Sprintf("http2: server sent GOAWAY and closed the connection; LastStreamID=%v, ErrCode=%v, debug=%q",
|
|
e.LastStreamID, e.ErrCode, e.DebugData)
|
|
}
|
|
|
|
func isEOFOrNetReadError(err error) bool {
|
|
if err == io.EOF {
|
|
return true
|
|
}
|
|
ne, ok := err.(*net.OpError)
|
|
return ok && ne.Op == "read"
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) cleanup() {
|
|
cc := rl.cc
|
|
cc.t.connPool().MarkDead(cc)
|
|
defer cc.closeConn()
|
|
defer close(cc.readerDone)
|
|
|
|
if cc.idleTimer != nil {
|
|
cc.idleTimer.Stop()
|
|
}
|
|
|
|
// Close any response bodies if the server closes prematurely.
|
|
// TODO: also do this if we've written the headers but not
|
|
// gotten a response yet.
|
|
err := cc.readerErr
|
|
cc.mu.Lock()
|
|
if cc.goAway != nil && isEOFOrNetReadError(err) {
|
|
err = GoAwayError{
|
|
LastStreamID: cc.goAway.LastStreamID,
|
|
ErrCode: cc.goAway.ErrCode,
|
|
DebugData: cc.goAwayDebug,
|
|
}
|
|
} else if err == io.EOF {
|
|
err = io.ErrUnexpectedEOF
|
|
}
|
|
cc.closed = true
|
|
for _, cs := range cc.streams {
|
|
select {
|
|
case <-cs.peerClosed:
|
|
// The server closed the stream before closing the conn,
|
|
// so no need to interrupt it.
|
|
default:
|
|
cs.abortStreamLocked(err)
|
|
}
|
|
}
|
|
cc.cond.Broadcast()
|
|
cc.mu.Unlock()
|
|
}
|
|
|
|
// countReadFrameError calls Transport.CountError with a string
|
|
// representing err.
|
|
func (cc *ClientConn) countReadFrameError(err error) {
|
|
f := cc.t.CountError
|
|
if f == nil || err == nil {
|
|
return
|
|
}
|
|
if ce, ok := err.(ConnectionError); ok {
|
|
errCode := ErrCode(ce)
|
|
f(fmt.Sprintf("read_frame_conn_error_%s", errCode.stringToken()))
|
|
return
|
|
}
|
|
if errors.Is(err, io.EOF) {
|
|
f("read_frame_eof")
|
|
return
|
|
}
|
|
if errors.Is(err, io.ErrUnexpectedEOF) {
|
|
f("read_frame_unexpected_eof")
|
|
return
|
|
}
|
|
if errors.Is(err, ErrFrameTooLarge) {
|
|
f("read_frame_too_large")
|
|
return
|
|
}
|
|
f("read_frame_other")
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) run() error {
|
|
cc := rl.cc
|
|
gotSettings := false
|
|
readIdleTimeout := cc.t.ReadIdleTimeout
|
|
var t *time.Timer
|
|
if readIdleTimeout != 0 {
|
|
t = time.AfterFunc(readIdleTimeout, cc.healthCheck)
|
|
defer t.Stop()
|
|
}
|
|
for {
|
|
f, err := cc.fr.ReadFrame()
|
|
if t != nil {
|
|
t.Reset(readIdleTimeout)
|
|
}
|
|
if err != nil {
|
|
cc.vlogf("http2: Transport readFrame error on conn %p: (%T) %v", cc, err, err)
|
|
}
|
|
if se, ok := err.(StreamError); ok {
|
|
if cs := rl.streamByID(se.StreamID); cs != nil {
|
|
if se.Cause == nil {
|
|
se.Cause = cc.fr.errDetail
|
|
}
|
|
rl.endStreamError(cs, se)
|
|
}
|
|
continue
|
|
} else if err != nil {
|
|
cc.countReadFrameError(err)
|
|
return err
|
|
}
|
|
if VerboseLogs {
|
|
cc.vlogf("http2: Transport received %s", summarizeFrame(f))
|
|
}
|
|
if !gotSettings {
|
|
if _, ok := f.(*SettingsFrame); !ok {
|
|
cc.logf("protocol error: received %T before a SETTINGS frame", f)
|
|
return ConnectionError(ErrCodeProtocol)
|
|
}
|
|
gotSettings = true
|
|
}
|
|
|
|
switch f := f.(type) {
|
|
case *MetaHeadersFrame:
|
|
err = rl.processHeaders(f)
|
|
case *DataFrame:
|
|
err = rl.processData(f)
|
|
case *GoAwayFrame:
|
|
err = rl.processGoAway(f)
|
|
case *RSTStreamFrame:
|
|
err = rl.processResetStream(f)
|
|
case *SettingsFrame:
|
|
err = rl.processSettings(f)
|
|
case *PushPromiseFrame:
|
|
err = rl.processPushPromise(f)
|
|
case *WindowUpdateFrame:
|
|
err = rl.processWindowUpdate(f)
|
|
case *PingFrame:
|
|
err = rl.processPing(f)
|
|
default:
|
|
cc.logf("Transport: unhandled response frame type %T", f)
|
|
}
|
|
if err != nil {
|
|
if VerboseLogs {
|
|
cc.vlogf("http2: Transport conn %p received error from processing frame %v: %v", cc, summarizeFrame(f), err)
|
|
}
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) processHeaders(f *MetaHeadersFrame) error {
|
|
cs := rl.streamByID(f.StreamID)
|
|
if cs == nil {
|
|
// We'd get here if we canceled a request while the
|
|
// server had its response still in flight. So if this
|
|
// was just something we canceled, ignore it.
|
|
return nil
|
|
}
|
|
if cs.readClosed {
|
|
rl.endStreamError(cs, StreamError{
|
|
StreamID: f.StreamID,
|
|
Code: ErrCodeProtocol,
|
|
Cause: errors.New("protocol error: headers after END_STREAM"),
|
|
})
|
|
return nil
|
|
}
|
|
if !cs.firstByte {
|
|
if cs.trace != nil {
|
|
// TODO(bradfitz): move first response byte earlier,
|
|
// when we first read the 9 byte header, not waiting
|
|
// until all the HEADERS+CONTINUATION frames have been
|
|
// merged. This works for now.
|
|
traceFirstResponseByte(cs.trace)
|
|
}
|
|
cs.firstByte = true
|
|
}
|
|
if !cs.pastHeaders {
|
|
cs.pastHeaders = true
|
|
} else {
|
|
return rl.processTrailers(cs, f)
|
|
}
|
|
|
|
res, err := rl.handleResponse(cs, f)
|
|
if err != nil {
|
|
if _, ok := err.(ConnectionError); ok {
|
|
return err
|
|
}
|
|
// Any other error type is a stream error.
|
|
rl.endStreamError(cs, StreamError{
|
|
StreamID: f.StreamID,
|
|
Code: ErrCodeProtocol,
|
|
Cause: err,
|
|
})
|
|
return nil // return nil from process* funcs to keep conn alive
|
|
}
|
|
if res == nil {
|
|
// (nil, nil) special case. See handleResponse docs.
|
|
return nil
|
|
}
|
|
cs.resTrailer = &res.Trailer
|
|
cs.res = res
|
|
close(cs.respHeaderRecv)
|
|
if f.StreamEnded() {
|
|
rl.endStream(cs)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// may return error types nil, or ConnectionError. Any other error value
|
|
// is a StreamError of type ErrCodeProtocol. The returned error in that case
|
|
// is the detail.
|
|
//
|
|
// As a special case, handleResponse may return (nil, nil) to skip the
|
|
// frame (currently only used for 1xx responses).
|
|
func (rl *clientConnReadLoop) handleResponse(cs *clientStream, f *MetaHeadersFrame) (*http.Response, error) {
|
|
if f.Truncated {
|
|
return nil, errResponseHeaderListSize
|
|
}
|
|
|
|
status := f.PseudoValue("status")
|
|
if status == "" {
|
|
return nil, errors.New("malformed response from server: missing status pseudo header")
|
|
}
|
|
statusCode, err := strconv.Atoi(status)
|
|
if err != nil {
|
|
return nil, errors.New("malformed response from server: malformed non-numeric status pseudo header")
|
|
}
|
|
|
|
regularFields := f.RegularFields()
|
|
strs := make([]string, len(regularFields))
|
|
header := make(http.Header, len(regularFields))
|
|
res := &http.Response{
|
|
Proto: "HTTP/2.0",
|
|
ProtoMajor: 2,
|
|
Header: header,
|
|
StatusCode: statusCode,
|
|
Status: status + " " + http.StatusText(statusCode),
|
|
}
|
|
for _, hf := range regularFields {
|
|
key := http.CanonicalHeaderKey(hf.Name)
|
|
if key == "Trailer" {
|
|
t := res.Trailer
|
|
if t == nil {
|
|
t = make(http.Header)
|
|
res.Trailer = t
|
|
}
|
|
foreachHeaderElement(hf.Value, func(v string) {
|
|
t[http.CanonicalHeaderKey(v)] = nil
|
|
})
|
|
} else {
|
|
vv := header[key]
|
|
if vv == nil && len(strs) > 0 {
|
|
// More than likely this will be a single-element key.
|
|
// Most headers aren't multi-valued.
|
|
// Set the capacity on strs[0] to 1, so any future append
|
|
// won't extend the slice into the other strings.
|
|
vv, strs = strs[:1:1], strs[1:]
|
|
vv[0] = hf.Value
|
|
header[key] = vv
|
|
} else {
|
|
header[key] = append(vv, hf.Value)
|
|
}
|
|
}
|
|
}
|
|
|
|
if statusCode >= 100 && statusCode <= 199 {
|
|
if f.StreamEnded() {
|
|
return nil, errors.New("1xx informational response with END_STREAM flag")
|
|
}
|
|
cs.num1xx++
|
|
const max1xxResponses = 5 // arbitrary bound on number of informational responses, same as net/http
|
|
if cs.num1xx > max1xxResponses {
|
|
return nil, errors.New("http2: too many 1xx informational responses")
|
|
}
|
|
if fn := cs.get1xxTraceFunc(); fn != nil {
|
|
if err := fn(statusCode, textproto.MIMEHeader(header)); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
if statusCode == 100 {
|
|
traceGot100Continue(cs.trace)
|
|
select {
|
|
case cs.on100 <- struct{}{}:
|
|
default:
|
|
}
|
|
}
|
|
cs.pastHeaders = false // do it all again
|
|
return nil, nil
|
|
}
|
|
|
|
res.ContentLength = -1
|
|
if clens := res.Header["Content-Length"]; len(clens) == 1 {
|
|
if cl, err := strconv.ParseUint(clens[0], 10, 63); err == nil {
|
|
res.ContentLength = int64(cl)
|
|
} else {
|
|
// TODO: care? unlike http/1, it won't mess up our framing, so it's
|
|
// more safe smuggling-wise to ignore.
|
|
}
|
|
} else if len(clens) > 1 {
|
|
// TODO: care? unlike http/1, it won't mess up our framing, so it's
|
|
// more safe smuggling-wise to ignore.
|
|
} else if f.StreamEnded() && !cs.isHead {
|
|
res.ContentLength = 0
|
|
}
|
|
|
|
if cs.isHead {
|
|
res.Body = noBody
|
|
return res, nil
|
|
}
|
|
|
|
if f.StreamEnded() {
|
|
if res.ContentLength > 0 {
|
|
res.Body = missingBody{}
|
|
} else {
|
|
res.Body = noBody
|
|
}
|
|
return res, nil
|
|
}
|
|
|
|
cs.bufPipe.setBuffer(&dataBuffer{expected: res.ContentLength})
|
|
cs.bytesRemain = res.ContentLength
|
|
res.Body = transportResponseBody{cs}
|
|
|
|
if cs.requestedGzip && asciiEqualFold(res.Header.Get("Content-Encoding"), "gzip") {
|
|
res.Header.Del("Content-Encoding")
|
|
res.Header.Del("Content-Length")
|
|
res.ContentLength = -1
|
|
res.Body = &gzipReader{body: res.Body}
|
|
res.Uncompressed = true
|
|
}
|
|
return res, nil
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) processTrailers(cs *clientStream, f *MetaHeadersFrame) error {
|
|
if cs.pastTrailers {
|
|
// Too many HEADERS frames for this stream.
|
|
return ConnectionError(ErrCodeProtocol)
|
|
}
|
|
cs.pastTrailers = true
|
|
if !f.StreamEnded() {
|
|
// We expect that any headers for trailers also
|
|
// has END_STREAM.
|
|
return ConnectionError(ErrCodeProtocol)
|
|
}
|
|
if len(f.PseudoFields()) > 0 {
|
|
// No pseudo header fields are defined for trailers.
|
|
// TODO: ConnectionError might be overly harsh? Check.
|
|
return ConnectionError(ErrCodeProtocol)
|
|
}
|
|
|
|
trailer := make(http.Header)
|
|
for _, hf := range f.RegularFields() {
|
|
key := http.CanonicalHeaderKey(hf.Name)
|
|
trailer[key] = append(trailer[key], hf.Value)
|
|
}
|
|
cs.trailer = trailer
|
|
|
|
rl.endStream(cs)
|
|
return nil
|
|
}
|
|
|
|
// transportResponseBody is the concrete type of Transport.RoundTrip's
|
|
// Response.Body. It is an io.ReadCloser.
|
|
type transportResponseBody struct {
|
|
cs *clientStream
|
|
}
|
|
|
|
func (b transportResponseBody) Read(p []byte) (n int, err error) {
|
|
cs := b.cs
|
|
cc := cs.cc
|
|
|
|
if cs.readErr != nil {
|
|
return 0, cs.readErr
|
|
}
|
|
n, err = b.cs.bufPipe.Read(p)
|
|
if cs.bytesRemain != -1 {
|
|
if int64(n) > cs.bytesRemain {
|
|
n = int(cs.bytesRemain)
|
|
if err == nil {
|
|
err = errors.New("net/http: server replied with more than declared Content-Length; truncated")
|
|
cs.abortStream(err)
|
|
}
|
|
cs.readErr = err
|
|
return int(cs.bytesRemain), err
|
|
}
|
|
cs.bytesRemain -= int64(n)
|
|
if err == io.EOF && cs.bytesRemain > 0 {
|
|
err = io.ErrUnexpectedEOF
|
|
cs.readErr = err
|
|
return n, err
|
|
}
|
|
}
|
|
if n == 0 {
|
|
// No flow control tokens to send back.
|
|
return
|
|
}
|
|
|
|
cc.mu.Lock()
|
|
var connAdd, streamAdd int32
|
|
// Check the conn-level first, before the stream-level.
|
|
if v := cc.inflow.available(); v < transportDefaultConnFlow/2 {
|
|
connAdd = transportDefaultConnFlow - v
|
|
cc.inflow.add(connAdd)
|
|
}
|
|
if err == nil { // No need to refresh if the stream is over or failed.
|
|
// Consider any buffered body data (read from the conn but not
|
|
// consumed by the client) when computing flow control for this
|
|
// stream.
|
|
v := int(cs.inflow.available()) + cs.bufPipe.Len()
|
|
if v < transportDefaultStreamFlow-transportDefaultStreamMinRefresh {
|
|
streamAdd = int32(transportDefaultStreamFlow - v)
|
|
cs.inflow.add(streamAdd)
|
|
}
|
|
}
|
|
cc.mu.Unlock()
|
|
|
|
if connAdd != 0 || streamAdd != 0 {
|
|
cc.wmu.Lock()
|
|
defer cc.wmu.Unlock()
|
|
if connAdd != 0 {
|
|
cc.fr.WriteWindowUpdate(0, mustUint31(connAdd))
|
|
}
|
|
if streamAdd != 0 {
|
|
cc.fr.WriteWindowUpdate(cs.ID, mustUint31(streamAdd))
|
|
}
|
|
cc.bw.Flush()
|
|
}
|
|
return
|
|
}
|
|
|
|
var errClosedResponseBody = errors.New("http2: response body closed")
|
|
|
|
func (b transportResponseBody) Close() error {
|
|
cs := b.cs
|
|
cc := cs.cc
|
|
|
|
unread := cs.bufPipe.Len()
|
|
if unread > 0 {
|
|
cc.mu.Lock()
|
|
// Return connection-level flow control.
|
|
if unread > 0 {
|
|
cc.inflow.add(int32(unread))
|
|
}
|
|
cc.mu.Unlock()
|
|
|
|
// TODO(dneil): Acquiring this mutex can block indefinitely.
|
|
// Move flow control return to a goroutine?
|
|
cc.wmu.Lock()
|
|
// Return connection-level flow control.
|
|
if unread > 0 {
|
|
cc.fr.WriteWindowUpdate(0, uint32(unread))
|
|
}
|
|
cc.bw.Flush()
|
|
cc.wmu.Unlock()
|
|
}
|
|
|
|
cs.bufPipe.BreakWithError(errClosedResponseBody)
|
|
cs.abortStream(errClosedResponseBody)
|
|
|
|
select {
|
|
case <-cs.donec:
|
|
case <-cs.ctx.Done():
|
|
// See golang/go#49366: The net/http package can cancel the
|
|
// request context after the response body is fully read.
|
|
// Don't treat this as an error.
|
|
return nil
|
|
case <-cs.reqCancel:
|
|
return errRequestCanceled
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) processData(f *DataFrame) error {
|
|
cc := rl.cc
|
|
cs := rl.streamByID(f.StreamID)
|
|
data := f.Data()
|
|
if cs == nil {
|
|
cc.mu.Lock()
|
|
neverSent := cc.nextStreamID
|
|
cc.mu.Unlock()
|
|
if f.StreamID >= neverSent {
|
|
// We never asked for this.
|
|
cc.logf("http2: Transport received unsolicited DATA frame; closing connection")
|
|
return ConnectionError(ErrCodeProtocol)
|
|
}
|
|
// We probably did ask for this, but canceled. Just ignore it.
|
|
// TODO: be stricter here? only silently ignore things which
|
|
// we canceled, but not things which were closed normally
|
|
// by the peer? Tough without accumulating too much state.
|
|
|
|
// But at least return their flow control:
|
|
if f.Length > 0 {
|
|
cc.mu.Lock()
|
|
cc.inflow.add(int32(f.Length))
|
|
cc.mu.Unlock()
|
|
|
|
cc.wmu.Lock()
|
|
cc.fr.WriteWindowUpdate(0, uint32(f.Length))
|
|
cc.bw.Flush()
|
|
cc.wmu.Unlock()
|
|
}
|
|
return nil
|
|
}
|
|
if cs.readClosed {
|
|
cc.logf("protocol error: received DATA after END_STREAM")
|
|
rl.endStreamError(cs, StreamError{
|
|
StreamID: f.StreamID,
|
|
Code: ErrCodeProtocol,
|
|
})
|
|
return nil
|
|
}
|
|
if !cs.firstByte {
|
|
cc.logf("protocol error: received DATA before a HEADERS frame")
|
|
rl.endStreamError(cs, StreamError{
|
|
StreamID: f.StreamID,
|
|
Code: ErrCodeProtocol,
|
|
})
|
|
return nil
|
|
}
|
|
if f.Length > 0 {
|
|
if cs.isHead && len(data) > 0 {
|
|
cc.logf("protocol error: received DATA on a HEAD request")
|
|
rl.endStreamError(cs, StreamError{
|
|
StreamID: f.StreamID,
|
|
Code: ErrCodeProtocol,
|
|
})
|
|
return nil
|
|
}
|
|
// Check connection-level flow control.
|
|
cc.mu.Lock()
|
|
if cs.inflow.available() >= int32(f.Length) {
|
|
cs.inflow.take(int32(f.Length))
|
|
} else {
|
|
cc.mu.Unlock()
|
|
return ConnectionError(ErrCodeFlowControl)
|
|
}
|
|
// Return any padded flow control now, since we won't
|
|
// refund it later on body reads.
|
|
var refund int
|
|
if pad := int(f.Length) - len(data); pad > 0 {
|
|
refund += pad
|
|
}
|
|
|
|
didReset := false
|
|
var err error
|
|
if len(data) > 0 {
|
|
if _, err = cs.bufPipe.Write(data); err != nil {
|
|
// Return len(data) now if the stream is already closed,
|
|
// since data will never be read.
|
|
didReset = true
|
|
refund += len(data)
|
|
}
|
|
}
|
|
|
|
if refund > 0 {
|
|
cc.inflow.add(int32(refund))
|
|
if !didReset {
|
|
cs.inflow.add(int32(refund))
|
|
}
|
|
}
|
|
cc.mu.Unlock()
|
|
|
|
if refund > 0 {
|
|
cc.wmu.Lock()
|
|
cc.fr.WriteWindowUpdate(0, uint32(refund))
|
|
if !didReset {
|
|
cc.fr.WriteWindowUpdate(cs.ID, uint32(refund))
|
|
}
|
|
cc.bw.Flush()
|
|
cc.wmu.Unlock()
|
|
}
|
|
|
|
if err != nil {
|
|
rl.endStreamError(cs, err)
|
|
return nil
|
|
}
|
|
}
|
|
|
|
if f.StreamEnded() {
|
|
rl.endStream(cs)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) endStream(cs *clientStream) {
|
|
// TODO: check that any declared content-length matches, like
|
|
// server.go's (*stream).endStream method.
|
|
if !cs.readClosed {
|
|
cs.readClosed = true
|
|
// Close cs.bufPipe and cs.peerClosed with cc.mu held to avoid a
|
|
// race condition: The caller can read io.EOF from Response.Body
|
|
// and close the body before we close cs.peerClosed, causing
|
|
// cleanupWriteRequest to send a RST_STREAM.
|
|
rl.cc.mu.Lock()
|
|
defer rl.cc.mu.Unlock()
|
|
cs.bufPipe.closeWithErrorAndCode(io.EOF, cs.copyTrailers)
|
|
close(cs.peerClosed)
|
|
}
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) endStreamError(cs *clientStream, err error) {
|
|
cs.readAborted = true
|
|
cs.abortStream(err)
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) streamByID(id uint32) *clientStream {
|
|
rl.cc.mu.Lock()
|
|
defer rl.cc.mu.Unlock()
|
|
cs := rl.cc.streams[id]
|
|
if cs != nil && !cs.readAborted {
|
|
return cs
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (cs *clientStream) copyTrailers() {
|
|
for k, vv := range cs.trailer {
|
|
t := cs.resTrailer
|
|
if *t == nil {
|
|
*t = make(http.Header)
|
|
}
|
|
(*t)[k] = vv
|
|
}
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) processGoAway(f *GoAwayFrame) error {
|
|
cc := rl.cc
|
|
cc.t.connPool().MarkDead(cc)
|
|
if f.ErrCode != 0 {
|
|
// TODO: deal with GOAWAY more. particularly the error code
|
|
cc.vlogf("transport got GOAWAY with error code = %v", f.ErrCode)
|
|
if fn := cc.t.CountError; fn != nil {
|
|
fn("recv_goaway_" + f.ErrCode.stringToken())
|
|
}
|
|
|
|
}
|
|
cc.setGoAway(f)
|
|
return nil
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) processSettings(f *SettingsFrame) error {
|
|
cc := rl.cc
|
|
// Locking both mu and wmu here allows frame encoding to read settings with only wmu held.
|
|
// Acquiring wmu when f.IsAck() is unnecessary, but convenient and mostly harmless.
|
|
cc.wmu.Lock()
|
|
defer cc.wmu.Unlock()
|
|
|
|
if err := rl.processSettingsNoWrite(f); err != nil {
|
|
return err
|
|
}
|
|
if !f.IsAck() {
|
|
cc.fr.WriteSettingsAck()
|
|
cc.bw.Flush()
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) processSettingsNoWrite(f *SettingsFrame) error {
|
|
cc := rl.cc
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
|
|
if f.IsAck() {
|
|
if cc.wantSettingsAck {
|
|
cc.wantSettingsAck = false
|
|
return nil
|
|
}
|
|
return ConnectionError(ErrCodeProtocol)
|
|
}
|
|
|
|
var seenMaxConcurrentStreams bool
|
|
err := f.ForeachSetting(func(s Setting) error {
|
|
switch s.ID {
|
|
case SettingMaxFrameSize:
|
|
cc.maxFrameSize = s.Val
|
|
case SettingMaxConcurrentStreams:
|
|
cc.maxConcurrentStreams = s.Val
|
|
seenMaxConcurrentStreams = true
|
|
case SettingMaxHeaderListSize:
|
|
cc.peerMaxHeaderListSize = uint64(s.Val)
|
|
case SettingInitialWindowSize:
|
|
// Values above the maximum flow-control
|
|
// window size of 2^31-1 MUST be treated as a
|
|
// connection error (Section 5.4.1) of type
|
|
// FLOW_CONTROL_ERROR.
|
|
if s.Val > math.MaxInt32 {
|
|
return ConnectionError(ErrCodeFlowControl)
|
|
}
|
|
|
|
// Adjust flow control of currently-open
|
|
// frames by the difference of the old initial
|
|
// window size and this one.
|
|
delta := int32(s.Val) - int32(cc.initialWindowSize)
|
|
for _, cs := range cc.streams {
|
|
cs.flow.add(delta)
|
|
}
|
|
cc.cond.Broadcast()
|
|
|
|
cc.initialWindowSize = s.Val
|
|
default:
|
|
// TODO(bradfitz): handle more settings? SETTINGS_HEADER_TABLE_SIZE probably.
|
|
cc.vlogf("Unhandled Setting: %v", s)
|
|
}
|
|
return nil
|
|
})
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if !cc.seenSettings {
|
|
if !seenMaxConcurrentStreams {
|
|
// This was the servers initial SETTINGS frame and it
|
|
// didn't contain a MAX_CONCURRENT_STREAMS field so
|
|
// increase the number of concurrent streams this
|
|
// connection can establish to our default.
|
|
cc.maxConcurrentStreams = defaultMaxConcurrentStreams
|
|
}
|
|
cc.seenSettings = true
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) processWindowUpdate(f *WindowUpdateFrame) error {
|
|
cc := rl.cc
|
|
cs := rl.streamByID(f.StreamID)
|
|
if f.StreamID != 0 && cs == nil {
|
|
return nil
|
|
}
|
|
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
|
|
fl := &cc.flow
|
|
if cs != nil {
|
|
fl = &cs.flow
|
|
}
|
|
if !fl.add(int32(f.Increment)) {
|
|
return ConnectionError(ErrCodeFlowControl)
|
|
}
|
|
cc.cond.Broadcast()
|
|
return nil
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) processResetStream(f *RSTStreamFrame) error {
|
|
cs := rl.streamByID(f.StreamID)
|
|
if cs == nil {
|
|
// TODO: return error if server tries to RST_STREAM an idle stream
|
|
return nil
|
|
}
|
|
serr := streamError(cs.ID, f.ErrCode)
|
|
serr.Cause = errFromPeer
|
|
if f.ErrCode == ErrCodeProtocol {
|
|
rl.cc.SetDoNotReuse()
|
|
}
|
|
if fn := cs.cc.t.CountError; fn != nil {
|
|
fn("recv_rststream_" + f.ErrCode.stringToken())
|
|
}
|
|
cs.abortStream(serr)
|
|
|
|
cs.bufPipe.CloseWithError(serr)
|
|
return nil
|
|
}
|
|
|
|
// Ping sends a PING frame to the server and waits for the ack.
|
|
func (cc *ClientConn) Ping(ctx context.Context) error {
|
|
c := make(chan struct{})
|
|
// Generate a random payload
|
|
var p [8]byte
|
|
for {
|
|
if _, err := rand.Read(p[:]); err != nil {
|
|
return err
|
|
}
|
|
cc.mu.Lock()
|
|
// check for dup before insert
|
|
if _, found := cc.pings[p]; !found {
|
|
cc.pings[p] = c
|
|
cc.mu.Unlock()
|
|
break
|
|
}
|
|
cc.mu.Unlock()
|
|
}
|
|
errc := make(chan error, 1)
|
|
go func() {
|
|
cc.wmu.Lock()
|
|
defer cc.wmu.Unlock()
|
|
if err := cc.fr.WritePing(false, p); err != nil {
|
|
errc <- err
|
|
return
|
|
}
|
|
if err := cc.bw.Flush(); err != nil {
|
|
errc <- err
|
|
return
|
|
}
|
|
}()
|
|
select {
|
|
case <-c:
|
|
return nil
|
|
case err := <-errc:
|
|
return err
|
|
case <-ctx.Done():
|
|
return ctx.Err()
|
|
case <-cc.readerDone:
|
|
// connection closed
|
|
return cc.readerErr
|
|
}
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) processPing(f *PingFrame) error {
|
|
if f.IsAck() {
|
|
cc := rl.cc
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
// If ack, notify listener if any
|
|
if c, ok := cc.pings[f.Data]; ok {
|
|
close(c)
|
|
delete(cc.pings, f.Data)
|
|
}
|
|
return nil
|
|
}
|
|
cc := rl.cc
|
|
cc.wmu.Lock()
|
|
defer cc.wmu.Unlock()
|
|
if err := cc.fr.WritePing(true, f.Data); err != nil {
|
|
return err
|
|
}
|
|
return cc.bw.Flush()
|
|
}
|
|
|
|
func (rl *clientConnReadLoop) processPushPromise(f *PushPromiseFrame) error {
|
|
// We told the peer we don't want them.
|
|
// Spec says:
|
|
// "PUSH_PROMISE MUST NOT be sent if the SETTINGS_ENABLE_PUSH
|
|
// setting of the peer endpoint is set to 0. An endpoint that
|
|
// has set this setting and has received acknowledgement MUST
|
|
// treat the receipt of a PUSH_PROMISE frame as a connection
|
|
// error (Section 5.4.1) of type PROTOCOL_ERROR."
|
|
return ConnectionError(ErrCodeProtocol)
|
|
}
|
|
|
|
func (cc *ClientConn) writeStreamReset(streamID uint32, code ErrCode, err error) {
|
|
// TODO: map err to more interesting error codes, once the
|
|
// HTTP community comes up with some. But currently for
|
|
// RST_STREAM there's no equivalent to GOAWAY frame's debug
|
|
// data, and the error codes are all pretty vague ("cancel").
|
|
cc.wmu.Lock()
|
|
cc.fr.WriteRSTStream(streamID, code)
|
|
cc.bw.Flush()
|
|
cc.wmu.Unlock()
|
|
}
|
|
|
|
var (
|
|
errResponseHeaderListSize = errors.New("http2: response header list larger than advertised limit")
|
|
errRequestHeaderListSize = errors.New("http2: request header list larger than peer's advertised limit")
|
|
)
|
|
|
|
func (cc *ClientConn) logf(format string, args ...interface{}) {
|
|
cc.t.logf(format, args...)
|
|
}
|
|
|
|
func (cc *ClientConn) vlogf(format string, args ...interface{}) {
|
|
cc.t.vlogf(format, args...)
|
|
}
|
|
|
|
func (t *Transport) vlogf(format string, args ...interface{}) {
|
|
if VerboseLogs {
|
|
t.logf(format, args...)
|
|
}
|
|
}
|
|
|
|
func (t *Transport) logf(format string, args ...interface{}) {
|
|
log.Printf(format, args...)
|
|
}
|
|
|
|
var noBody io.ReadCloser = noBodyReader{}
|
|
|
|
type noBodyReader struct{}
|
|
|
|
func (noBodyReader) Close() error { return nil }
|
|
func (noBodyReader) Read([]byte) (int, error) { return 0, io.EOF }
|
|
|
|
type missingBody struct{}
|
|
|
|
func (missingBody) Close() error { return nil }
|
|
func (missingBody) Read([]byte) (int, error) { return 0, io.ErrUnexpectedEOF }
|
|
|
|
func strSliceContains(ss []string, s string) bool {
|
|
for _, v := range ss {
|
|
if v == s {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
type erringRoundTripper struct{ err error }
|
|
|
|
func (rt erringRoundTripper) RoundTripErr() error { return rt.err }
|
|
func (rt erringRoundTripper) RoundTrip(*http.Request) (*http.Response, error) { return nil, rt.err }
|
|
|
|
// gzipReader wraps a response body so it can lazily
|
|
// call gzip.NewReader on the first call to Read
|
|
type gzipReader struct {
|
|
_ incomparable
|
|
body io.ReadCloser // underlying Response.Body
|
|
zr *gzip.Reader // lazily-initialized gzip reader
|
|
zerr error // sticky error
|
|
}
|
|
|
|
func (gz *gzipReader) Read(p []byte) (n int, err error) {
|
|
if gz.zerr != nil {
|
|
return 0, gz.zerr
|
|
}
|
|
if gz.zr == nil {
|
|
gz.zr, err = gzip.NewReader(gz.body)
|
|
if err != nil {
|
|
gz.zerr = err
|
|
return 0, err
|
|
}
|
|
}
|
|
return gz.zr.Read(p)
|
|
}
|
|
|
|
func (gz *gzipReader) Close() error {
|
|
return gz.body.Close()
|
|
}
|
|
|
|
type errorReader struct{ err error }
|
|
|
|
func (r errorReader) Read(p []byte) (int, error) { return 0, r.err }
|
|
|
|
// isConnectionCloseRequest reports whether req should use its own
|
|
// connection for a single request and then close the connection.
|
|
func isConnectionCloseRequest(req *http.Request) bool {
|
|
return req.Close || httpguts.HeaderValuesContainsToken(req.Header["Connection"], "close")
|
|
}
|
|
|
|
// registerHTTPSProtocol calls Transport.RegisterProtocol but
|
|
// converting panics into errors.
|
|
func registerHTTPSProtocol(t *http.Transport, rt noDialH2RoundTripper) (err error) {
|
|
defer func() {
|
|
if e := recover(); e != nil {
|
|
err = fmt.Errorf("%v", e)
|
|
}
|
|
}()
|
|
t.RegisterProtocol("https", rt)
|
|
return nil
|
|
}
|
|
|
|
// noDialH2RoundTripper is a RoundTripper which only tries to complete the request
|
|
// if there's already has a cached connection to the host.
|
|
// (The field is exported so it can be accessed via reflect from net/http; tested
|
|
// by TestNoDialH2RoundTripperType)
|
|
type noDialH2RoundTripper struct{ *Transport }
|
|
|
|
func (rt noDialH2RoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
|
|
res, err := rt.Transport.RoundTrip(req)
|
|
if isNoCachedConnError(err) {
|
|
return nil, http.ErrSkipAltProtocol
|
|
}
|
|
return res, err
|
|
}
|
|
|
|
func (t *Transport) idleConnTimeout() time.Duration {
|
|
if t.t1 != nil {
|
|
return t.t1.IdleConnTimeout
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func traceGetConn(req *http.Request, hostPort string) {
|
|
trace := httptrace.ContextClientTrace(req.Context())
|
|
if trace == nil || trace.GetConn == nil {
|
|
return
|
|
}
|
|
trace.GetConn(hostPort)
|
|
}
|
|
|
|
func traceGotConn(req *http.Request, cc *ClientConn, reused bool) {
|
|
trace := httptrace.ContextClientTrace(req.Context())
|
|
if trace == nil || trace.GotConn == nil {
|
|
return
|
|
}
|
|
ci := httptrace.GotConnInfo{Conn: cc.tconn}
|
|
ci.Reused = reused
|
|
cc.mu.Lock()
|
|
ci.WasIdle = len(cc.streams) == 0 && reused
|
|
if ci.WasIdle && !cc.lastActive.IsZero() {
|
|
ci.IdleTime = time.Now().Sub(cc.lastActive)
|
|
}
|
|
cc.mu.Unlock()
|
|
|
|
trace.GotConn(ci)
|
|
}
|
|
|
|
func traceWroteHeaders(trace *httptrace.ClientTrace) {
|
|
if trace != nil && trace.WroteHeaders != nil {
|
|
trace.WroteHeaders()
|
|
}
|
|
}
|
|
|
|
func traceGot100Continue(trace *httptrace.ClientTrace) {
|
|
if trace != nil && trace.Got100Continue != nil {
|
|
trace.Got100Continue()
|
|
}
|
|
}
|
|
|
|
func traceWait100Continue(trace *httptrace.ClientTrace) {
|
|
if trace != nil && trace.Wait100Continue != nil {
|
|
trace.Wait100Continue()
|
|
}
|
|
}
|
|
|
|
func traceWroteRequest(trace *httptrace.ClientTrace, err error) {
|
|
if trace != nil && trace.WroteRequest != nil {
|
|
trace.WroteRequest(httptrace.WroteRequestInfo{Err: err})
|
|
}
|
|
}
|
|
|
|
func traceFirstResponseByte(trace *httptrace.ClientTrace) {
|
|
if trace != nil && trace.GotFirstResponseByte != nil {
|
|
trace.GotFirstResponseByte()
|
|
}
|
|
}
|