Switch from encoding/json -> jsoniter (#570)

* Switch from encoding/json -> jsoniter

Signed-off-by: Thomas Jackson <jacksontj.89@gmail.com>

api/client_test.go

@@ -20,8 +20,6 @@ import (
 	"net/http/httptest"
 	"net/url"
 	"testing"
-
-	"github.com/prometheus/tsdb/testutil"
 )
 
 func TestConfig(t *testing.T) {
@@ -148,7 +146,9 @@ func TestDoGetFallback(t *testing.T) {
 	defer server.Close()
 
 	u, err := url.Parse(server.URL)
-	testutil.Ok(t, err)
+	if err != nil {
+		t.Fatal(err)
+	}
 	client := &httpClient{client: *(server.Client())}
 
 	// Do a post, and ensure that the post succeeds.
@@ -158,7 +158,7 @@ func TestDoGetFallback(t *testing.T) {
 	}
 	resp := &testResponse{}
 	if err := json.Unmarshal(b, resp); err != nil {
-		testutil.Ok(t, err)
+		t.Fatal(err)
 	}
 	if resp.Method != http.MethodPost {
 		t.Fatalf("Mismatch method")
@@ -174,7 +174,7 @@ func TestDoGetFallback(t *testing.T) {
 		t.Fatalf("Error doing local request: %v", err)
 	}
 	if err := json.Unmarshal(b, resp); err != nil {
-		testutil.Ok(t, err)
+		t.Fatal(err)
 	}
 	if resp.Method != http.MethodGet {
 		t.Fatalf("Mismatch method")

api/prometheus/v1/api.go

@@ -17,18 +17,105 @@ package v1
 
 import (
 	"context"
-	"encoding/json"
 	"errors"
 	"fmt"
+	"math"
 	"net/http"
 	"strconv"
 	"strings"
 	"time"
+	"unsafe"
+
+	json "github.com/json-iterator/go"
+
+	"github.com/prometheus/common/model"
 
 	"github.com/prometheus/client_golang/api"
-	"github.com/prometheus/common/model"
 )
 
+func init() {
+	json.RegisterTypeEncoderFunc("model.SamplePair", marshalPointJSON, marshalPointJSONIsEmpty)
+	json.RegisterTypeDecoderFunc("model.SamplePair", unMarshalPointJSON)
+}
+
+func unMarshalPointJSON(ptr unsafe.Pointer, iter *json.Iterator) {
+	p := (*model.SamplePair)(ptr)
+	if !iter.ReadArray() {
+		iter.ReportError("unmarshal model.SamplePair", "SamplePair must be [timestamp, value]")
+		return
+	}
+	t := iter.ReadNumber()
+	if err := p.Timestamp.UnmarshalJSON([]byte(t)); err != nil {
+		iter.ReportError("unmarshal model.SamplePair", err.Error())
+		return
+	}
+	if !iter.ReadArray() {
+		iter.ReportError("unmarshal model.SamplePair", "SamplePair missing value")
+		return
+	}
+
+	f, err := strconv.ParseFloat(iter.ReadString(), 64)
+	if err != nil {
+		iter.ReportError("unmarshal model.SamplePair", err.Error())
+		return
+	}
+	p.Value = model.SampleValue(f)
+
+	if iter.ReadArray() {
+		iter.ReportError("unmarshal model.SamplePair", "SamplePair has too many values, must be [timestamp, value]")
+		return
+	}
+}
+
+func marshalPointJSON(ptr unsafe.Pointer, stream *json.Stream) {
+	p := *((*model.SamplePair)(ptr))
+	stream.WriteArrayStart()
+	// Write out the timestamp as a float divided by 1000.
+	// This is ~3x faster than converting to a float.
+	t := int64(p.Timestamp)
+	if t < 0 {
+		stream.WriteRaw(`-`)
+		t = -t
+	}
+	stream.WriteInt64(t / 1000)
+	fraction := t % 1000
+	if fraction != 0 {
+		stream.WriteRaw(`.`)
+		if fraction < 100 {
+			stream.WriteRaw(`0`)
+		}
+		if fraction < 10 {
+			stream.WriteRaw(`0`)
+		}
+		stream.WriteInt64(fraction)
+	}
+	stream.WriteMore()
+	stream.WriteRaw(`"`)
+
+	// Taken from https://github.com/json-iterator/go/blob/master/stream_float.go#L71 as a workaround
+	// to https://github.com/json-iterator/go/issues/365 (jsoniter, to follow json standard, doesn't allow inf/nan)
+	buf := stream.Buffer()
+	abs := math.Abs(float64(p.Value))
+	fmt := byte('f')
+	// Note: Must use float32 comparisons for underlying float32 value to get precise cutoffs right.
+	if abs != 0 {
+		if abs < 1e-6 || abs >= 1e21 {
+			fmt = 'e'
+			fmt = 'e'
+		}
+	}
+	buf = strconv.AppendFloat(buf, float64(p.Value), fmt, -1, 64)
+	stream.SetBuffer(buf)
+
+	stream.WriteRaw(`"`)
+	stream.WriteArrayEnd()
+
+}
+
+func marshalPointJSONIsEmpty(ptr unsafe.Pointer) bool {
+	return false
+}
+
 const (
 	statusAPIError = 422
 

api/prometheus/v1/api_bench_test.go

@@ -0,0 +1,112 @@
+// Copyright 2019 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package v1
+
+import (
+	"encoding/json"
+	"strconv"
+	"testing"
+	"time"
+
+	jsoniter "github.com/json-iterator/go"
+
+	"github.com/prometheus/common/model"
+)
+
+func generateData(timeseries, datapoints int) model.Matrix {
+	m := make(model.Matrix, 0)
+
+	for i := 0; i < timeseries; i++ {
+		lset := map[model.LabelName]model.LabelValue{
+			model.MetricNameLabel: model.LabelValue("timeseries_" + strconv.Itoa(i)),
+		}
+		now := model.Now()
+		values := make([]model.SamplePair, datapoints)
+
+		for x := datapoints; x > 0; x-- {
+			values[x-1] = model.SamplePair{
+				// Set the time back assuming a 15s interval. Since this is used for
+				// Marshal/Unmarshal testing the actual interval doesn't matter.
+				Timestamp: now.Add(time.Second * -15 * time.Duration(x)),
+				Value:     model.SampleValue(float64(x)),
+			}
+		}
+
+		ss := &model.SampleStream{
+			Metric: model.Metric(lset),
+			Values: values,
+		}
+
+		m = append(m, ss)
+	}
+	return m
+}
+
+func BenchmarkSamplesJsonSerialization(b *testing.B) {
+	for _, timeseriesCount := range []int{10, 100, 1000} {
+		b.Run(strconv.Itoa(timeseriesCount), func(b *testing.B) {
+			for _, datapointCount := range []int{10, 100, 1000} {
+				b.Run(strconv.Itoa(datapointCount), func(b *testing.B) {
+					data := generateData(timeseriesCount, datapointCount)
+
+					dataBytes, err := json.Marshal(data)
+					if err != nil {
+						b.Fatalf("Error marshaling: %v", err)
+					}
+
+					b.Run("marshal", func(b *testing.B) {
+						b.Run("encoding/json", func(b *testing.B) {
+							b.ReportAllocs()
+							for i := 0; i < b.N; i++ {
+								if _, err := json.Marshal(data); err != nil {
+									b.Fatal(err)
+								}
+							}
+						})
+
+						b.Run("jsoniter", func(b *testing.B) {
+							b.ReportAllocs()
+							for i := 0; i < b.N; i++ {
+								if _, err := jsoniter.Marshal(data); err != nil {
+									b.Fatal(err)
+								}
+							}
+						})
+					})
+
+					b.Run("unmarshal", func(b *testing.B) {
+						b.Run("encoding/json", func(b *testing.B) {
+							b.ReportAllocs()
+							var m model.Matrix
+							for i := 0; i < b.N; i++ {
+								if err := json.Unmarshal(dataBytes, &m); err != nil {
+									b.Fatal(err)
+								}
+							}
+						})
+
+						b.Run("jsoniter", func(b *testing.B) {
+							b.ReportAllocs()
+							var m model.Matrix
+							for i := 0; i < b.N; i++ {
+								if err := jsoniter.Unmarshal(dataBytes, &m); err != nil {
+									b.Fatal(err)
+								}
+							}
+						})
+					})
+				})
+			}
+		})
+	}
+}

api/prometheus/v1/api_test.go

@@ -15,9 +15,9 @@ package v1
 
 import (
 	"context"
-	"encoding/json"
 	"errors"
 	"fmt"
+	"math"
 	"net/http"
 	"net/url"
 	"reflect"
@@ -25,9 +25,12 @@ import (
 	"testing"
 	"time"
 
-	"github.com/prometheus/client_golang/api"
+	json "github.com/json-iterator/go"
+
 	"github.com/prometheus/common/model"
 	"github.com/prometheus/tsdb/testutil"
+
+	"github.com/prometheus/client_golang/api"
 )
 
 type apiTest struct {
@@ -792,7 +795,7 @@ func TestAPIClientDo(t *testing.T) {
 			response: "bad json",
 			expectedErr: &Error{
 				Type: ErrBadResponse,
-				Msg:  "invalid character 'b' looking for beginning of value",
+				Msg:  "readObjectStart: expect { or n, but found b, error found in #1 byte of ...|bad json|..., bigger context ...|bad json|...",
 			},
 		},
 		{
@@ -882,3 +885,99 @@ func TestAPIClientDo(t *testing.T) {
 
 	}
 }
+
+func TestSamplesJsonSerialization(t *testing.T) {
+	tests := []struct {
+		point    model.SamplePair
+		expected string
+	}{
+		{
+			point:    model.SamplePair{0, 0},
+			expected: `[0,"0"]`,
+		},
+		{
+			point:    model.SamplePair{1, 20},
+			expected: `[0.001,"20"]`,
+		},
+		{
+			point:    model.SamplePair{10, 20},
+			expected: `[0.010,"20"]`,
+		},
+		{
+			point:    model.SamplePair{100, 20},
+			expected: `[0.100,"20"]`,
+		},
+		{
+			point:    model.SamplePair{1001, 20},
+			expected: `[1.001,"20"]`,
+		},
+		{
+			point:    model.SamplePair{1010, 20},
+			expected: `[1.010,"20"]`,
+		},
+		{
+			point:    model.SamplePair{1100, 20},
+			expected: `[1.100,"20"]`,
+		},
+		{
+			point:    model.SamplePair{12345678123456555, 20},
+			expected: `[12345678123456.555,"20"]`,
+		},
+		{
+			point:    model.SamplePair{-1, 20},
+			expected: `[-0.001,"20"]`,
+		},
+		{
+			point:    model.SamplePair{0, model.SampleValue(math.NaN())},
+			expected: `[0,"NaN"]`,
+		},
+		{
+			point:    model.SamplePair{0, model.SampleValue(math.Inf(1))},
+			expected: `[0,"+Inf"]`,
+		},
+		{
+			point:    model.SamplePair{0, model.SampleValue(math.Inf(-1))},
+			expected: `[0,"-Inf"]`,
+		},
+		{
+			point:    model.SamplePair{0, model.SampleValue(1.2345678e6)},
+			expected: `[0,"1234567.8"]`,
+		},
+		{
+			point:    model.SamplePair{0, 1.2345678e-6},
+			expected: `[0,"0.0000012345678"]`,
+		},
+		{
+			point:    model.SamplePair{0, 1.2345678e-67},
+			expected: `[0,"1.2345678e-67"]`,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.expected, func(t *testing.T) {
+			b, err := json.Marshal(test.point)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if string(b) != test.expected {
+				t.Fatalf("Mismatch marshal expected=%s actual=%s", test.expected, string(b))
+			}
+
+			// To test Unmarshal we will Unmarshal then re-Marshal this way we
+			// can do a string compare, otherwise Nan values don't show equivalence
+			// properly.
+			var sp model.SamplePair
+			if err = json.Unmarshal(b, &sp); err != nil {
+				t.Fatal(err)
+			}
+
+			b, err = json.Marshal(sp)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if string(b) != test.expected {
+				t.Fatalf("Mismatch marshal expected=%s actual=%s", test.expected, string(b))
+			}
+		})
+	}
+}

go.mod

@@ -4,8 +4,12 @@ require (
 	github.com/beorn7/perks v1.0.0
 	github.com/go-logfmt/logfmt v0.4.0 // indirect
 	github.com/golang/protobuf v1.3.1
+	github.com/json-iterator/go v1.1.6
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.1 // indirect
 	github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90
-	github.com/prometheus/common v0.4.0
+	github.com/prometheus/common v0.4.1
-	github.com/prometheus/procfs v0.0.0-20190507164030-5867b95ac084
+	github.com/prometheus/procfs v0.0.0-20190522114515-bc1a522cf7b1
 	github.com/prometheus/tsdb v0.7.1
+	github.com/stretchr/testify v1.3.0 // indirect
 )

go.sum

@@ -8,6 +8,7 @@ github.com/beorn7/perks v1.0.0 h1:HWo1m869IqiPhD389kmkxeTalrjNbbJTC8LXupb+sl0=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
 github.com/cespare/xxhash v1.1.0 h1:a6HrQnmkObjyL+Gs60czilIUGqrzKutQD6XZog3p+ko=
 github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dgryski/go-sip13 v0.0.0-20181026042036-e10d5fee7954/go.mod h1:vAd38F8PWV+bWy6jNmig1y/TA+kYO4g3RSRF0IAv0no=
@@ -24,12 +25,18 @@ github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.1 h1:YF8+flBXS5eO826T4nzqPrxfhQThhXl0YzfuUPu4SBg=
 github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/json-iterator/go v1.1.6 h1:MrUvLMLTMxbqFJ9kzlvat/rYZqZnW3u4wkLzWTaFwKs=
+github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
 github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/kr/logfmt v0.0.0-20140226030751-b84e30acd515 h1:T+h1c/A9Gawja4Y9mFVWj2vyii2bbUNDw3kt9VxK2EY=
 github.com/kr/logfmt v0.0.0-20140226030751-b84e30acd515/go.mod h1:+0opPa2QZZtGFBFZlji/RkVcI2GknAs/DXo4wKdlNEc=
 github.com/matttproud/golang_protobuf_extensions v1.0.1 h1:4hp9jkHxhMHkqkrB3Ix0jegS5sx/RkqARlsWZ6pIwiU=
 github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
+github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w8PVh93nsPXa1VrQ6jlwL5oN8l14QlcNfg=
+github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
+github.com/modern-go/reflect2 v1.0.1 h1:9f412s+6RmYXLWZSEzVVgPGK7C2PphHj5RJrvfx9AWI=
+github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
 github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
 github.com/oklog/ulid v1.3.1/go.mod h1:CirwcVhetQ6Lv90oh/F+FBtV6XMibvdAFo93nm5qn4U=
 github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
@@ -41,19 +48,22 @@ github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910/go.mod h1:
 github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90 h1:S/YWwWx/RA8rT8tKFRuGUZhuA90OyIBpPCXkcbwU8DE=
 github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/prometheus/common v0.0.0-20181113130724-41aa239b4cce/go.mod h1:daVV7qP5qjZbuso7PdcryaAu0sAZbrN9i7WWcTMWvro=
-github.com/prometheus/common v0.4.0 h1:7etb9YClo3a6HjLzfl6rIQaU+FDfi0VSX39io3aQ+DM=
+github.com/prometheus/common v0.4.1 h1:K0MGApIoQvMw27RTdJkPbr3JZ7DNbtxQNyi5STVM6Kw=
-github.com/prometheus/common v0.4.0/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y86RQel1bk4=
+github.com/prometheus/common v0.4.1/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y86RQel1bk4=
 github.com/prometheus/procfs v0.0.0-20181005140218-185b4288413d/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
-github.com/prometheus/procfs v0.0.0-20190507164030-5867b95ac084 h1:sofwID9zm4tzrgykg80hfFph1mryUeLRsUfoocVVmRY=
+github.com/prometheus/procfs v0.0.0-20190522114515-bc1a522cf7b1 h1:Lo6mRUjdS99f3zxYOUalftWHUoOGaDRqFk1+j0Q57/I=
-github.com/prometheus/procfs v0.0.0-20190507164030-5867b95ac084/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
+github.com/prometheus/procfs v0.0.0-20190522114515-bc1a522cf7b1/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
 github.com/prometheus/tsdb v0.7.1 h1:YZcsG11NqnK4czYLrWd9mpEuAJIHVQLwdrleYfszMAA=
 github.com/prometheus/tsdb v0.7.1/go.mod h1:qhTCs0VvXwvX/y3TZrWD7rabWM+ijKTux40TwIPHuXU=
 github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
 github.com/spaolacci/murmur3 v0.0.0-20180118202830-f09979ecbc72 h1:qLC7fQah7D6K1B0ujays3HV9gkFtllcxhzImRR7ArPQ=
 github.com/spaolacci/murmur3 v0.0.0-20180118202830-f09979ecbc72/go.mod h1:JwIasOWyU6f++ZhiEuf87xNszmSA2myDM2Kzu9HwQUA=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
+github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/net v0.0.0-20181114220301-adae6a3d119a/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/sync v0.0.0-20181108010431-42b317875d0f h1:Bl/8QSvNqXvPGPGXa2z5xUTmV7VDcZyvRZ+QQXkXTZQ=