gzip for v3 #153 (#183)

Co-authored-by: Кирилл Горбунов <kirya_gorbunov_2015@mail.ru>
Co-committed-by: Кирилл Горбунов <kirya_gorbunov_2015@mail.ru>
This commit is contained in:
Кирилл Горбунов 2024-03-11 13:21:11 +03:00 committed by Василий Толстов
parent abe5be3ddc
commit 95dcdd6025

View File

@ -2,13 +2,36 @@ package meter // import "go.unistack.org/micro-server-http/v3/handler/meter"
import (
"bytes"
"compress/gzip"
"context"
"io"
"strings"
"sync"
codecpb "go.unistack.org/micro-proto/v3/codec"
"go.unistack.org/micro/v3/errors"
"go.unistack.org/micro/v3/logger"
"go.unistack.org/micro/v3/metadata"
"go.unistack.org/micro/v3/meter"
)
const (
contentEncodingHeader = "Content-Encoding"
acceptEncodingHeader = "Accept-Encoding"
)
var gzipPool = sync.Pool{
New: func() interface{} {
return gzip.NewWriter(nil)
},
}
var bufPool = sync.Pool{
New: func() interface{} {
return bytes.NewBuffer(nil)
},
}
// guard to fail early
var _ MeterServiceServer = &Handler{}
@ -56,12 +79,46 @@ func NewHandler(opts ...Option) *Handler {
}
func (h *Handler) Metrics(ctx context.Context, req *codecpb.Frame, rsp *codecpb.Frame) error {
buf := bytes.NewBuffer(nil)
if err := h.opts.Meter.Write(buf, h.opts.MeterOptions...); err != nil {
return errors.InternalServerError(h.opts.Name, "%v", err)
log, ok := logger.FromContext(ctx)
if !ok {
log = logger.DefaultLogger()
}
buf := bufPool.Get().(*bytes.Buffer)
defer bufPool.Put(buf)
buf.Reset()
w := io.Writer(buf)
if md, ok := metadata.FromIncomingContext(ctx); gzipAccepted(md) && ok {
md.Set(contentEncodingHeader, "gzip")
gz := gzipPool.Get().(*gzip.Writer)
defer gzipPool.Put(gz)
gz.Reset(w)
defer gz.Close()
w = gz
}
if err := h.opts.Meter.Write(w, h.opts.MeterOptions...); err != nil {
log.Error(ctx, errors.InternalServerError(h.opts.Name, "%v", err))
return nil
}
rsp.Data = buf.Bytes()
return nil
}
// gzipAccepted returns whether the client will accept gzip-encoded content.
func gzipAccepted(md metadata.Metadata) bool {
a, ok := md.Get(acceptEncodingHeader)
if !ok {
return false
}
if strings.Contains(a, "gzip") {
return true
}
return false
}