add zstd and snappy compression for query api

pkg/api/queryapi/compression.go

@@ -0,0 +1,90 @@
+package queryapi
+
+import (
+	"io"
+	"net/http"
+	"strings"
+
+	"github.com/klauspost/compress/gzip"
+	"github.com/klauspost/compress/snappy"
+	"github.com/klauspost/compress/zlib"
+	"github.com/klauspost/compress/zstd"
+)
+
+const (
+	acceptEncodingHeader  = "Accept-Encoding"
+	contentEncodingHeader = "Content-Encoding"
+	gzipEncoding          = "gzip"
+	deflateEncoding       = "deflate"
+	snappyEncoding        = "snappy"
+	zstdEncoding          = "zstd"
+)
+
+// Wrapper around http.Handler which adds suitable response compression based
+// on the client's Accept-Encoding headers.
+type compressedResponseWriter struct {
+	http.ResponseWriter
+	writer io.Writer
+}
+
+// Writes HTTP response content data.
+func (c *compressedResponseWriter) Write(p []byte) (int, error) {
+	return c.writer.Write(p)
+}
+
+// Closes the compressedResponseWriter and ensures to flush all data before.
+func (c *compressedResponseWriter) Close() {
+	if zstdWriter, ok := c.writer.(*zstd.Encoder); ok {
+		zstdWriter.Flush()
+	}
+	if snappyWriter, ok := c.writer.(*snappy.Writer); ok {
+		snappyWriter.Flush()
+	}
+	if zlibWriter, ok := c.writer.(*zlib.Writer); ok {
+		zlibWriter.Flush()
+	}
+	if gzipWriter, ok := c.writer.(*gzip.Writer); ok {
+		gzipWriter.Flush()
+	}
+	if closer, ok := c.writer.(io.Closer); ok {
+		defer closer.Close()
+	}
+}
+
+// Constructs a new compressedResponseWriter based on client request headers.
+func newCompressedResponseWriter(writer http.ResponseWriter, req *http.Request) *compressedResponseWriter {
+	encodings := strings.Split(req.Header.Get(acceptEncodingHeader), ",")
+	for _, encoding := range encodings {
+		switch strings.TrimSpace(encoding) {
+		case zstdEncoding:
+			encoder, err := zstd.NewWriter(writer)
+			if err == nil {
+				writer.Header().Set(contentEncodingHeader, zstdEncoding)
+				return &compressedResponseWriter{ResponseWriter: writer, writer: encoder}
+			}
+		case snappyEncoding:
+			writer.Header().Set(contentEncodingHeader, snappyEncoding)
+			return &compressedResponseWriter{ResponseWriter: writer, writer: snappy.NewBufferedWriter(writer)}
+		case gzipEncoding:
+			writer.Header().Set(contentEncodingHeader, gzipEncoding)
+			return &compressedResponseWriter{ResponseWriter: writer, writer: gzip.NewWriter(writer)}
+		case deflateEncoding:
+			writer.Header().Set(contentEncodingHeader, deflateEncoding)
+			return &compressedResponseWriter{ResponseWriter: writer, writer: zlib.NewWriter(writer)}
+		}
+	}
+	return &compressedResponseWriter{ResponseWriter: writer, writer: writer}
+}
+
+// CompressionHandler is a wrapper around http.Handler which adds suitable
+// response compression based on the client's Accept-Encoding headers.
+type CompressionHandler struct {
+	Handler http.Handler
+}
+
+// ServeHTTP adds compression to the original http.Handler's ServeHTTP() method.
+func (c CompressionHandler) ServeHTTP(writer http.ResponseWriter, req *http.Request) {
+	compWriter := newCompressedResponseWriter(writer, req)
+	c.Handler.ServeHTTP(compWriter, req)
+	compWriter.Close()
+}

pkg/api/queryapi/query_api.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"net/http"
+	"strconv"
 	"time"
 
 	"github.com/go-kit/log"
@@ -208,7 +209,7 @@ func (q *QueryAPI) Wrap(f apiFunc) http.HandlerFunc {
 		w.WriteHeader(http.StatusNoContent)
 	}
 
-	return httputil.CompressionHandler{
+	return CompressionHandler{
 		Handler: http.HandlerFunc(hf),
 	}.ServeHTTP
 }
@@ -237,6 +238,7 @@ func (q *QueryAPI) respond(w http.ResponseWriter, req *http.Request, data interf
 	}
 
 	w.Header().Set("Content-Type", codec.ContentType().String())
+	w.Header().Set("X-Uncompressed-Length", strconv.Itoa(len(b)))
 	w.WriteHeader(http.StatusOK)
 	if n, err := w.Write(b); err != nil {
 		level.Error(q.logger).Log("error writing response", "url", req.URL, "bytesWritten", n, "err", err)

pkg/frontend/transport/handler.go

@@ -76,8 +76,6 @@ const (
 	limitBytesStoreGateway  = `exceeded bytes limit`
 )
 
-var noopResponseSizeLimiter = limiter.NewResponseSizeLimiter(0)
-
 // Config for a Handler.
 type HandlerConfig struct {
 	LogQueriesLongerThan      time.Duration `yaml:"log_queries_longer_than"`
@@ -308,7 +306,7 @@ func (f *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 			// If the response status code is not 2xx, try to get the
 			// error message from response body.
 			if resp.StatusCode/100 != 2 {
-				body, err2 := tripperware.BodyBytes(resp, noopResponseSizeLimiter, f.log)
+				body, err2 := tripperware.BodyBytes(resp, f.log)
 				if err2 == nil {
 					err = httpgrpc.Errorf(resp.StatusCode, "%s", string(body))
 				}

pkg/querier/tripperware/instantquery/instant_query.go

@@ -6,6 +6,7 @@ import (
 	"io"
 	"net/http"
 	"net/url"
+	"strconv"
 	"strings"
 	"time"
 
@@ -45,8 +46,15 @@ type instantQueryCodec struct {
 
 func NewInstantQueryCodec(compressionStr string, defaultCodecTypeStr string) instantQueryCodec {
 	compression := tripperware.NonCompression // default
-	if compressionStr == string(tripperware.GzipCompression) {
+	switch compressionStr {
+	case string(tripperware.GzipCompression):
 		compression = tripperware.GzipCompression
+
+	case string(tripperware.SnappyCompression):
+		compression = tripperware.SnappyCompression
+
+	case string(tripperware.ZstdCompression):
+		compression = tripperware.ZstdCompression
 	}
 
 	defaultCodecType := tripperware.JsonCodecType // default
@@ -100,8 +108,18 @@ func (c instantQueryCodec) DecodeResponse(ctx context.Context, r *http.Response,
 		return nil, err
 	}
 
+	responseSize, err := strconv.Atoi(r.Header.Get("X-Uncompressed-Length"))
+	if err != nil {
+		log.Error(err)
+		return nil, err
+	}
+
 	responseSizeLimiter := limiter.ResponseSizeLimiterFromContextWithFallback(ctx)
-	body, err := tripperware.BodyBytes(r, responseSizeLimiter, log)
+	if err := responseSizeLimiter.AddResponseBytes(responseSize); err != nil {
+		return nil, httpgrpc.Errorf(http.StatusUnprocessableEntity, "%s", err.Error())
+	}
+
+	body, err := tripperware.BodyBytes(r, log)
 	if err != nil {
 		log.Error(err)
 		return nil, err

pkg/querier/tripperware/query.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"compress/gzip"
 	"context"
-	"encoding/binary"
 	"fmt"
 	"io"
 	"net/http"
@@ -16,6 +15,8 @@ import (
 	"github.com/go-kit/log"
 	"github.com/gogo/protobuf/proto"
 	jsoniter "github.com/json-iterator/go"
+	"github.com/klauspost/compress/snappy"
+	"github.com/klauspost/compress/zstd"
 	"github.com/opentracing/opentracing-go"
 	otlog "github.com/opentracing/opentracing-go/log"
 	"github.com/pkg/errors"
@@ -27,7 +28,6 @@ import (
 
 	"github.com/cortexproject/cortex/pkg/chunk"
 	"github.com/cortexproject/cortex/pkg/cortexpb"
-	"github.com/cortexproject/cortex/pkg/util/limiter"
 	"github.com/cortexproject/cortex/pkg/util/runutil"
 )
 
@@ -44,6 +44,8 @@ type Compression string
 
 const (
 	GzipCompression     Compression = "gzip"
+	ZstdCompression     Compression = "zstd"
+	SnappyCompression   Compression = "snappy"
 	NonCompression      Compression = ""
 	JsonCodecType       CodecType   = "json"
 	ProtobufCodecType   CodecType   = "protobuf"
@@ -434,7 +436,7 @@ type Buffer interface {
 	Bytes() []byte
 }
 
-func BodyBytes(res *http.Response, responseSizeLimiter *limiter.ResponseSizeLimiter, logger log.Logger) ([]byte, error) {
+func BodyBytes(res *http.Response, logger log.Logger) ([]byte, error) {
 	var buf *bytes.Buffer
 
 	// Attempt to cast the response body to a Buffer and use it if possible.
@@ -452,11 +454,6 @@ func BodyBytes(res *http.Response, responseSizeLimiter *limiter.ResponseSizeLimi
 		}
 	}
 
-	responseSize := getResponseSize(res, buf)
-	if err := responseSizeLimiter.AddResponseBytes(responseSize); err != nil {
-		return nil, httpgrpc.Errorf(http.StatusUnprocessableEntity, "%s", err.Error())
-	}
-
 	// if the response is gzipped, lets unzip it here
 	if strings.EqualFold(res.Header.Get("Content-Encoding"), "gzip") {
 		gReader, err := gzip.NewReader(buf)
@@ -468,15 +465,33 @@ func BodyBytes(res *http.Response, responseSizeLimiter *limiter.ResponseSizeLimi
 		return io.ReadAll(gReader)
 	}
 
+	// if the response is snappy compressed, decode it here
+	if strings.EqualFold(res.Header.Get("Content-Encoding"), "snappy") {
+		sReader := snappy.NewReader(buf)
+		return io.ReadAll(sReader)
+	}
+
+	// if the response is zstd compressed, decode it here
+	if strings.EqualFold(res.Header.Get("Content-Encoding"), "zstd") {
+		zReader, err := zstd.NewReader(buf)
+		if err != nil {
+			return nil, err
+		}
+		defer runutil.CloseWithLogOnErr(logger, io.NopCloser(zReader), "close zstd decoder")
+
+		return io.ReadAll(zReader)
+	}
+
 	return buf.Bytes(), nil
 }
 
 func BodyBytesFromHTTPGRPCResponse(res *httpgrpc.HTTPResponse, logger log.Logger) ([]byte, error) {
-	// if the response is gzipped, lets unzip it here
 	headers := http.Header{}
 	for _, h := range res.Headers {
 		headers[h.Key] = h.Values
 	}
+
+	// if the response is gzipped, lets unzip it here
 	if strings.EqualFold(headers.Get("Content-Encoding"), "gzip") {
 		gReader, err := gzip.NewReader(bytes.NewBuffer(res.Body))
 		if err != nil {
@@ -487,16 +502,24 @@ func BodyBytesFromHTTPGRPCResponse(res *httpgrpc.HTTPResponse, logger log.Logger
 		return io.ReadAll(gReader)
 	}
 
-	return res.Body, nil
-}
+	// if the response is snappy compressed, decode it here
+	if strings.EqualFold(headers.Get("Content-Encoding"), "snappy") {
+		sReader := snappy.NewReader(bytes.NewBuffer(res.Body))
+		return io.ReadAll(sReader)
+	}
+
+	// if the response is zstd compressed, decode it here
+	if strings.EqualFold(headers.Get("Content-Encoding"), "zstd") {
+		zReader, err := zstd.NewReader(bytes.NewBuffer(res.Body))
+		if err != nil {
+			return nil, err
+		}
+		defer runutil.CloseWithLogOnErr(logger, io.NopCloser(zReader), "close zstd decoder")
 
-func getResponseSize(res *http.Response, buf *bytes.Buffer) int {
-	if strings.EqualFold(res.Header.Get("Content-Encoding"), "gzip") && len(buf.Bytes()) >= 4 {
-		// GZIP body contains the size of the original (uncompressed) input data
-		// modulo 2^32 in the last 4 bytes (https://www.ietf.org/rfc/rfc1952.txt).
-		return int(binary.LittleEndian.Uint32(buf.Bytes()[len(buf.Bytes())-4:]))
+		return io.ReadAll(zReader)
 	}
-	return len(buf.Bytes())
+
+	return res.Body, nil
 }
 
 // UnmarshalJSON implements json.Unmarshaler.
@@ -755,9 +778,17 @@ func (s *PrometheusResponseStats) MarshalJSON() ([]byte, error) {
 }
 
 func SetRequestHeaders(h http.Header, defaultCodecType CodecType, compression Compression) {
-	if compression == GzipCompression {
+	switch compression {
+	case GzipCompression:
 		h.Set("Accept-Encoding", string(GzipCompression))
+
+	case SnappyCompression:
+		h.Set("Accept-Encoding", string(SnappyCompression))
+
+	case ZstdCompression:
+		h.Set("Accept-Encoding", string(ZstdCompression))
 	}
+
 	if defaultCodecType == ProtobufCodecType {
 		h.Set("Accept", ApplicationProtobuf+", "+ApplicationJson)
 	} else {

pkg/querier/tripperware/query_test.go

@@ -1,10 +1,7 @@
 package tripperware
 
 import (
-	"bytes"
-	"compress/gzip"
 	"math"
-	"net/http"
 	"strconv"
 	"testing"
 	"time"
@@ -196,50 +193,3 @@ func generateData(timeseries, datapoints int) (floatMatrix, histogramMatrix []*S
 	}
 	return
 }
-
-func Test_getResponseSize(t *testing.T) {
-	tests := []struct {
-		body    []byte
-		useGzip bool
-	}{
-		{
-			body:    []byte(`foo`),
-			useGzip: false,
-		},
-		{
-			body:    []byte(`foo`),
-			useGzip: true,
-		},
-		{
-			body:    []byte(`{"status":"success","data":{"resultType":"vector","result":[]}}`),
-			useGzip: false,
-		},
-		{
-			body:    []byte(`{"status":"success","data":{"resultType":"vector","result":[]}}`),
-			useGzip: true,
-		},
-	}
-
-	for i, test := range tests {
-		t.Run(strconv.Itoa(i), func(t *testing.T) {
-			expectedBodyLength := len(test.body)
-			buf := &bytes.Buffer{}
-			response := &http.Response{}
-
-			if test.useGzip {
-				response = &http.Response{
-					Header: http.Header{"Content-Encoding": []string{"gzip"}},
-				}
-				w := gzip.NewWriter(buf)
-				_, err := w.Write(test.body)
-				require.NoError(t, err)
-				w.Close()
-			} else {
-				buf = bytes.NewBuffer(test.body)
-			}
-
-			bodyLength := getResponseSize(response, buf)
-			require.Equal(t, expectedBodyLength, bodyLength)
-		})
-	}
-}