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961aa0533f
This change adds support for gzip encoding on HTTP responses. Gzip encoding is used when the client sets the 'accept-encoding: gzip' header. Original change by @brianosaurus, with fixes from @SjonHortensius.
67 lines
1.7 KiB
Go
67 lines
1.7 KiB
Go
// Copyright 2019 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package rpc
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import (
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"compress/gzip"
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"io"
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"io/ioutil"
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"net/http"
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"strings"
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"sync"
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)
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var gzPool = sync.Pool{
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New: func() interface{} {
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w := gzip.NewWriter(ioutil.Discard)
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return w
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},
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}
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type gzipResponseWriter struct {
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io.Writer
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http.ResponseWriter
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}
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func (w *gzipResponseWriter) WriteHeader(status int) {
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w.Header().Del("Content-Length")
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w.ResponseWriter.WriteHeader(status)
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}
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func (w *gzipResponseWriter) Write(b []byte) (int, error) {
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return w.Writer.Write(b)
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}
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func newGzipHandler(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if !strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
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next.ServeHTTP(w, r)
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return
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}
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w.Header().Set("Content-Encoding", "gzip")
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gz := gzPool.Get().(*gzip.Writer)
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defer gzPool.Put(gz)
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gz.Reset(w)
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defer gz.Close()
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next.ServeHTTP(&gzipResponseWriter{ResponseWriter: w, Writer: gz}, r)
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})
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}
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