Paul Lecuq
36c5d6f2ed
- web service with json support - web page - cron service to update database infos
127 lines
2.4 KiB
Go
127 lines
2.4 KiB
Go
package packd
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
"time"
|
|
)
|
|
|
|
var _ File = &virtualFile{}
|
|
var _ io.Reader = &virtualFile{}
|
|
var _ io.Writer = &virtualFile{}
|
|
var _ fmt.Stringer = &virtualFile{}
|
|
|
|
type virtualFile struct {
|
|
io.Reader
|
|
name string
|
|
info fileInfo
|
|
original []byte
|
|
}
|
|
|
|
func (f virtualFile) Name() string {
|
|
return f.name
|
|
}
|
|
|
|
func (f *virtualFile) Seek(offset int64, whence int) (int64, error) {
|
|
return f.Reader.(*bytes.Reader).Seek(offset, whence)
|
|
}
|
|
|
|
func (f virtualFile) FileInfo() (os.FileInfo, error) {
|
|
return f.info, nil
|
|
}
|
|
|
|
func (f *virtualFile) Close() error {
|
|
return nil
|
|
}
|
|
|
|
func (f virtualFile) Readdir(count int) ([]os.FileInfo, error) {
|
|
return []os.FileInfo{f.info}, nil
|
|
}
|
|
|
|
func (f virtualFile) Stat() (os.FileInfo, error) {
|
|
return f.info, nil
|
|
}
|
|
|
|
func (f virtualFile) String() string {
|
|
return string(f.original)
|
|
}
|
|
|
|
// Read reads the next len(p) bytes from the virtualFile and
|
|
// rewind read offset to 0 when it met EOF.
|
|
func (f *virtualFile) Read(p []byte) (int, error) {
|
|
i, err := f.Reader.Read(p)
|
|
|
|
if i == 0 || err == io.EOF {
|
|
f.Seek(0, io.SeekStart)
|
|
}
|
|
return i, err
|
|
}
|
|
|
|
// Write copies byte slice p to content of virtualFile.
|
|
func (f *virtualFile) Write(p []byte) (int, error) {
|
|
return f.write(p)
|
|
}
|
|
|
|
// write copies byte slice or data from io.Reader to content of the
|
|
// virtualFile and update related information of the virtualFile.
|
|
func (f *virtualFile) write(d interface{}) (c int, err error) {
|
|
bb := &bytes.Buffer{}
|
|
switch d.(type) {
|
|
case []byte:
|
|
c, err = bb.Write(d.([]byte))
|
|
case io.Reader:
|
|
if d != nil {
|
|
i64, e := io.Copy(bb, d.(io.Reader))
|
|
c = int(i64)
|
|
err = e
|
|
}
|
|
default:
|
|
err = fmt.Errorf("unknown type of argument")
|
|
}
|
|
|
|
if err != nil {
|
|
return c, err
|
|
}
|
|
|
|
f.info.size = int64(c)
|
|
f.info.modTime = time.Now()
|
|
f.original = bb.Bytes()
|
|
f.Reader = bytes.NewReader(f.original)
|
|
return c, nil
|
|
}
|
|
|
|
// NewFile returns a new "virtual" file
|
|
func NewFile(name string, r io.Reader) (File, error) {
|
|
return buildFile(name, r)
|
|
}
|
|
|
|
// NewDir returns a new "virtual" directory
|
|
func NewDir(name string) (File, error) {
|
|
v, err := buildFile(name, nil)
|
|
if err != nil {
|
|
return v, err
|
|
}
|
|
v.info.isDir = true
|
|
return v, nil
|
|
}
|
|
|
|
func buildFile(name string, r io.Reader) (*virtualFile, error) {
|
|
vf := &virtualFile{
|
|
name: name,
|
|
info: fileInfo{
|
|
Path: name,
|
|
modTime: time.Now(),
|
|
},
|
|
}
|
|
|
|
var err error
|
|
if r != nil {
|
|
_, err = vf.write(r)
|
|
} else {
|
|
_, err = vf.write([]byte{}) // for safety
|
|
}
|
|
return vf, err
|
|
}
|