`emicklei/go-restful` is used by:
- `k8s.io/client-go` (Godeps)
Refs:
- e121606b0d/Godeps/Godeps.json
123 lines
3.7 KiB
Go
123 lines
3.7 KiB
Go
package restful
|
|
|
|
// Copyright 2013 Ernest Micklei. All rights reserved.
|
|
// Use of this source code is governed by a license
|
|
// that can be found in the LICENSE file.
|
|
|
|
import (
|
|
"bufio"
|
|
"compress/gzip"
|
|
"compress/zlib"
|
|
"errors"
|
|
"io"
|
|
"net"
|
|
"net/http"
|
|
"strings"
|
|
)
|
|
|
|
// OBSOLETE : use restful.DefaultContainer.EnableContentEncoding(true) to change this setting.
|
|
var EnableContentEncoding = false
|
|
|
|
// CompressingResponseWriter is a http.ResponseWriter that can perform content encoding (gzip and zlib)
|
|
type CompressingResponseWriter struct {
|
|
writer http.ResponseWriter
|
|
compressor io.WriteCloser
|
|
encoding string
|
|
}
|
|
|
|
// Header is part of http.ResponseWriter interface
|
|
func (c *CompressingResponseWriter) Header() http.Header {
|
|
return c.writer.Header()
|
|
}
|
|
|
|
// WriteHeader is part of http.ResponseWriter interface
|
|
func (c *CompressingResponseWriter) WriteHeader(status int) {
|
|
c.writer.WriteHeader(status)
|
|
}
|
|
|
|
// Write is part of http.ResponseWriter interface
|
|
// It is passed through the compressor
|
|
func (c *CompressingResponseWriter) Write(bytes []byte) (int, error) {
|
|
if c.isCompressorClosed() {
|
|
return -1, errors.New("Compressing error: tried to write data using closed compressor")
|
|
}
|
|
return c.compressor.Write(bytes)
|
|
}
|
|
|
|
// CloseNotify is part of http.CloseNotifier interface
|
|
func (c *CompressingResponseWriter) CloseNotify() <-chan bool {
|
|
return c.writer.(http.CloseNotifier).CloseNotify()
|
|
}
|
|
|
|
// Close the underlying compressor
|
|
func (c *CompressingResponseWriter) Close() error {
|
|
if c.isCompressorClosed() {
|
|
return errors.New("Compressing error: tried to close already closed compressor")
|
|
}
|
|
|
|
c.compressor.Close()
|
|
if ENCODING_GZIP == c.encoding {
|
|
currentCompressorProvider.ReleaseGzipWriter(c.compressor.(*gzip.Writer))
|
|
}
|
|
if ENCODING_DEFLATE == c.encoding {
|
|
currentCompressorProvider.ReleaseZlibWriter(c.compressor.(*zlib.Writer))
|
|
}
|
|
// gc hint needed?
|
|
c.compressor = nil
|
|
return nil
|
|
}
|
|
|
|
func (c *CompressingResponseWriter) isCompressorClosed() bool {
|
|
return nil == c.compressor
|
|
}
|
|
|
|
// Hijack implements the Hijacker interface
|
|
// This is especially useful when combining Container.EnabledContentEncoding
|
|
// in combination with websockets (for instance gorilla/websocket)
|
|
func (c *CompressingResponseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
|
|
hijacker, ok := c.writer.(http.Hijacker)
|
|
if !ok {
|
|
return nil, nil, errors.New("ResponseWriter doesn't support Hijacker interface")
|
|
}
|
|
return hijacker.Hijack()
|
|
}
|
|
|
|
// WantsCompressedResponse reads the Accept-Encoding header to see if and which encoding is requested.
|
|
func wantsCompressedResponse(httpRequest *http.Request) (bool, string) {
|
|
header := httpRequest.Header.Get(HEADER_AcceptEncoding)
|
|
gi := strings.Index(header, ENCODING_GZIP)
|
|
zi := strings.Index(header, ENCODING_DEFLATE)
|
|
// use in order of appearance
|
|
if gi == -1 {
|
|
return zi != -1, ENCODING_DEFLATE
|
|
} else if zi == -1 {
|
|
return gi != -1, ENCODING_GZIP
|
|
} else {
|
|
if gi < zi {
|
|
return true, ENCODING_GZIP
|
|
}
|
|
return true, ENCODING_DEFLATE
|
|
}
|
|
}
|
|
|
|
// NewCompressingResponseWriter create a CompressingResponseWriter for a known encoding = {gzip,deflate}
|
|
func NewCompressingResponseWriter(httpWriter http.ResponseWriter, encoding string) (*CompressingResponseWriter, error) {
|
|
httpWriter.Header().Set(HEADER_ContentEncoding, encoding)
|
|
c := new(CompressingResponseWriter)
|
|
c.writer = httpWriter
|
|
var err error
|
|
if ENCODING_GZIP == encoding {
|
|
w := currentCompressorProvider.AcquireGzipWriter()
|
|
w.Reset(httpWriter)
|
|
c.compressor = w
|
|
c.encoding = ENCODING_GZIP
|
|
} else if ENCODING_DEFLATE == encoding {
|
|
w := currentCompressorProvider.AcquireZlibWriter()
|
|
w.Reset(httpWriter)
|
|
c.compressor = w
|
|
c.encoding = ENCODING_DEFLATE
|
|
} else {
|
|
return nil, errors.New("Unknown encoding:" + encoding)
|
|
}
|
|
return c, err
|
|
}
|