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lib/httpserver: add -http.disableResponseCompression flag, which may help saving CPU resources at the cost of higher network bandwidth usage

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This commit is contained in:
Aliaksandr Valialkin 2019-05-24 12:18:40 +03:00
parent 8e3eb5b39d
commit a26e774eca
1 changed files with 8 additions and 0 deletions
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8
lib/httpserver/httpserver.go
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@ -5,6 +5,7 @@ import (
"compress/gzip" "compress/gzip"
"context" "context"
"crypto/tls" "crypto/tls"
"flag"
"fmt" "fmt"
"io" "io"
"net" "net"
@ -22,6 +23,8 @@ import (
) )
var ( var (
disableResponseCompression = flag.Bool("http.disableResponseCompression", false, "Disable compression of HTTP responses for saving CPU resources. By default compression is enabled to save network bandwidth")
servers = make(map[string]*http.Server) servers = make(map[string]*http.Server)
serversLock sync.Mutex serversLock sync.Mutex
) )
@ -39,6 +42,8 @@ type RequestHandler func(w http.ResponseWriter, r *http.Request) bool
// By default all the responses are transparently compressed, since Google // By default all the responses are transparently compressed, since Google
// charges a lot for the egress traffic. The compression may be disabled // charges a lot for the egress traffic. The compression may be disabled
// by calling DisableResponseCompression before writing the first byte to w. // by calling DisableResponseCompression before writing the first byte to w.
//
// The compression is also disabled if -http.disableResponseCompression flag is set.
func Serve(addr string, rh RequestHandler) { func Serve(addr string, rh RequestHandler) {
logger.Infof("starting http server at http://%s/", addr) logger.Infof("starting http server at http://%s/", addr)
logger.Infof("pprof handlers are exposed at http://%s/debug/pprof/", addr) logger.Infof("pprof handlers are exposed at http://%s/debug/pprof/", addr)
@ -157,6 +162,9 @@ func handlerWrapper(w http.ResponseWriter, r *http.Request, rh RequestHandler) {
} }
func maybeGzipResponseWriter(w http.ResponseWriter, r *http.Request) http.ResponseWriter { func maybeGzipResponseWriter(w http.ResponseWriter, r *http.Request) http.ResponseWriter {
if *disableResponseCompression {
return w
}
ae := r.Header.Get("Accept-Encoding") ae := r.Header.Get("Accept-Encoding")
if ae == "" { if ae == "" {
return w return w