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buffer.go
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buffer.go
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// Package httpbuffer provides a buffer for HTTP requests so that the
// Content-Length may be set and compression applied for dynamic pages.
package httpbuffer // import "vimagination.zapto.org/httpbuffer"
import (
"io"
"net/http"
"strconv"
"sync"
"vimagination.zapto.org/httpencoding"
"vimagination.zapto.org/httpwrap"
"vimagination.zapto.org/memio"
)
var (
// BufferSize determines the initial size of the buffer
BufferSize = 128 << 10
responsePool = sync.Pool{
New: func() interface{} {
return &responseWriter{
Buffer: make(memio.Buffer, 0, BufferSize),
}
},
}
)
// Handler wraps a http.Handler and provides a buffer and possible gzip
// compression. It buffers the Writes and sends the Content-Length header
// before Writing the buffer to the client.
type Handler struct {
http.Handler
}
type encodingType struct {
Encoding
}
func (e *encodingType) Handle(encoding httpencoding.Encoding) (ok bool) {
e.Encoding, ok = encodings[encoding]
return ok
}
// ServeHTTP implements the http.Handler interface
func (h Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
var encoding encodingType
httpencoding.HandleEncoding(r, &encoding)
if encoding.Encoding == nil {
httpencoding.InvalidEncoding(w)
return
}
httpencoding.ClearEncoding(r)
resp := responsePool.Get().(*responseWriter)
resp.Writer = encoding.Open(&resp.Buffer)
sw, _ := resp.Writer.(httpwrap.StringWriter)
h.Handler.ServeHTTP(
httpwrap.Wrap(w, httpwrap.OverrideWriter(resp), httpwrap.OverrideHeaderWriter(resp), httpwrap.OverrideStringWriter(sw), httpwrap.OverrideFlusher(nil), httpwrap.OverrideHijacker(nil)),
r,
)
encoding.Close(resp.Writer)
if resp.Written == 0 {
} else if enc := encoding.Name(); enc != "" {
w.Header().Set("Content-Encoding", enc)
}
w.Header().Set("Content-Length", strconv.Itoa(len(resp.Buffer)))
if resp.Status > 0 {
w.WriteHeader(resp.Status)
}
if resp.Written > 0 {
w.Write(resp.Buffer)
}
*resp = responseWriter{
Buffer: resp.Buffer[:0],
}
responsePool.Put(resp)
}
type responseWriter struct {
Status int
Writer io.Writer
Written int64
Buffer memio.Buffer
}
func (r *responseWriter) Write(p []byte) (int, error) {
n, err := r.Writer.Write(p)
r.Written += int64(n)
return n, err
}
func (r *responseWriter) WriteHeader(s int) {
r.Status = s
}