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gziphandler.go
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gziphandler.go
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// Copyright (C) 2023 Gobalsky Labs Limited
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package rest
import (
"compress/gzip"
"net/http"
"strings"
"sync"
"code.vegaprotocol.io/vega/logging"
)
type gzipResponseWriter struct {
http.ResponseWriter
w *gzip.Writer
statusCode int
headerWritten bool
}
var pool = sync.Pool{
New: func() interface{} {
w, _ := gzip.NewWriterLevel(nil, gzip.BestSpeed)
return &gzipResponseWriter{
w: w,
}
},
}
func (gzr *gzipResponseWriter) WriteHeader(statusCode int) {
gzr.statusCode = statusCode
gzr.headerWritten = true
if gzr.statusCode != http.StatusNotModified && gzr.statusCode != http.StatusNoContent {
gzr.ResponseWriter.Header().Del("Content-Length")
gzr.ResponseWriter.Header().Set("Content-Encoding", "gzip")
}
gzr.ResponseWriter.WriteHeader(statusCode)
}
func (gzr *gzipResponseWriter) Write(b []byte) (int, error) {
if _, ok := gzr.Header()["Content-Type"]; !ok {
// If no content type, apply sniffing algorithm to un-gzipped body.
gzr.ResponseWriter.Header().Set("Content-Type", http.DetectContentType(b))
}
if !gzr.headerWritten {
// This is exactly what Go would also do if it hasn't been written yet.
gzr.WriteHeader(http.StatusOK)
}
return gzr.w.Write(b)
}
func (gzr *gzipResponseWriter) Flush() {
if gzr.w != nil {
gzr.w.Flush()
}
if fw, ok := gzr.ResponseWriter.(http.Flusher); ok {
fw.Flush()
}
}
func NewGzipHandler(logger logging.Logger, fn http.HandlerFunc) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if !strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
fn(w, r)
return
}
gzr := pool.Get().(*gzipResponseWriter)
gzr.statusCode = 0
gzr.headerWritten = false
gzr.ResponseWriter = w
gzr.w.Reset(w)
defer func() {
// gzr.w.Close will write a footer even if no data has been written.
// StatusNotModified and StatusNoContent expect an empty body so don't close it.
if gzr.statusCode != http.StatusNotModified && gzr.statusCode != http.StatusNoContent {
if err := gzr.w.Close(); err != nil {
logger.Error("Failed to Gzip output from REST proxy", logging.Error(err))
}
}
pool.Put(gzr)
}()
fn(gzr, r)
}
}