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tracer.go
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tracer.go
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// Copyright (c) 2021 The Houyi 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 houyi
import (
"fmt"
"github.com/opentracing/opentracing-go"
"github.com/uber/jaeger-client-go/utils"
"go.uber.org/zap"
"io"
"math/rand"
"strconv"
"sync"
"time"
)
type Tracer interface {
opentracing.Tracer
io.Closer
Sampler() Sampler
Tags() []opentracing.Tag
}
type TracerParams struct {
Logger *zap.Logger
Reporter Reporter
Sampler Sampler
}
type houyiTracer struct {
logger *zap.Logger
spanAllocator sync.Pool
serviceName string
reporter Reporter
sampler Sampler
process Process
randomNumber func() uint64
injectors map[interface{}]Injector
extractors map[interface{}]Extractor
tags []opentracing.Tag
}
func NewTracer(serviceName string, params *TracerParams) Tracer {
t := &houyiTracer{
serviceName: serviceName,
logger: params.Logger,
reporter: params.Reporter,
sampler: params.Sampler,
injectors: make(map[interface{}]Injector),
extractors: make(map[interface{}]Extractor),
spanAllocator: sync.Pool{
New: func() interface{} {
return &Span{}
},
},
}
bp := &BinaryPropagator{
buffers: sync.Pool{},
}
t.injectors[opentracing.Binary] = bp
t.extractors[opentracing.Binary] = bp
hdp := &HttpHeadersPropagator{}
t.injectors[opentracing.HTTPHeaders] = hdp
t.extractors[opentracing.HTTPHeaders] = hdp
seedGenerator := utils.NewRand(time.Now().UnixNano())
pool := sync.Pool{
New: func() interface{} {
return rand.NewSource(seedGenerator.Int63())
},
}
t.randomNumber = func() uint64 {
generator := pool.Get().(rand.Source)
number := uint64(generator.Int63())
pool.Put(generator)
return number
}
t.tags = make([]opentracing.Tag, 0)
t.process = Process{
Service: serviceName,
UUID: strconv.FormatUint(t.randomNumber(), 16),
Tags: t.tags,
}
return t
}
func (t *houyiTracer) StartSpan(operationName string, opts ...opentracing.StartSpanOption) opentracing.Span {
sso := opentracing.StartSpanOptions{}
for _, o := range opts {
o.Apply(&sso)
}
return t.startSpanWithOptions(operationName, sso)
}
// startSpanWithOptions is similar with the Jaeger version
func (t *houyiTracer) startSpanWithOptions(operationName string, options opentracing.StartSpanOptions) opentracing.Span {
if options.StartTime.IsZero() {
options.StartTime = time.Now()
}
var parentCtx SpanContext
var ctx SpanContext
var hasParent bool
references := make([]opentracing.SpanReference, 0)
for _, ref := range options.References {
ctxRef, ok := ref.ReferencedContext.(SpanContext)
if !ok {
t.logger.Error("ReferencedContext is not type of SpanContext")
continue
}
references = append(references, opentracing.SpanReference{
Type: ref.Type,
ReferencedContext: ctxRef,
})
if !hasParent {
hasParent = ref.Type == opentracing.ChildOfRef
parentCtx = ctxRef
}
}
ctx.baggage = make(map[string]string)
if !hasParent {
ctx.traceID.High = t.randomNumber()
ctx.traceID.Low = t.randomNumber()
ctx.spanID = SpanID(ctx.traceID.Low)
ctx.parentID = 0
} else {
ctx.traceID = parentCtx.traceID
ctx.spanID = SpanID(t.randomNumber())
ctx.parentID = parentCtx.spanID
ctx.flags = parentCtx.flags
ctx.baggage = parentCtx.baggage
}
if ctx.baggage == nil {
ctx.baggage = make(map[string]string)
}
sp := t.spanAllocator.Get().(*Span)
sp.context = ctx
sp.tracer = t
sp.operationName = operationName
sp.startTime = options.StartTime
sp.duration = 0
sp.ref = references
sp.isIngress = sp.context.parentID == 0
sp.logs = make([]opentracing.LogRecord, 0)
sp.tags = make([]opentracing.Tag, 0)
for key, tag := range options.Tags {
sp.SetTag(key, tag)
}
// making sampling decision for every span due to calculate QPS
decision := t.sampler.OnCreateSpan(sp)
if !hasParent {
sp.tags = append(sp.tags, decision.Tag...)
if decision.Sampled {
sp.context.flags = 1
} else {
sp.context.flags = 0
}
} else if parentCtx.baggage != nil {
if v, ok := parentCtx.baggage[BaggageServiceNameKey]; ok {
sp.tags = append(sp.tags, opentracing.Tag{
Key: ParentServiceNameTagKey,
Value: v,
})
} else {
fmt.Println("Not found service name: ", parentCtx.baggage)
}
if v, ok := parentCtx.baggage[BaggageOperationNameKey]; ok {
sp.tags = append(sp.tags, opentracing.Tag{
Key: ParentOperationNameTagKey,
Value: v,
})
}
}
sp.context.baggage[BaggageServiceNameKey] = t.serviceName
sp.context.baggage[BaggageOperationNameKey] = operationName
return sp
}
func (t *houyiTracer) Inject(ctx opentracing.SpanContext, format interface{}, carrier interface{}) error {
if injector, ok := t.injectors[format]; ok {
return injector.Inject(ctx.(SpanContext), carrier)
} else {
return opentracing.ErrUnsupportedFormat
}
}
func (t *houyiTracer) Extract(format interface{}, carrier interface{}) (opentracing.SpanContext, error) {
if extractor, ok := t.extractors[format]; ok {
return extractor.Extract(carrier)
} else {
return emptyContext, opentracing.ErrUnsupportedFormat
}
}
func (t *houyiTracer) Close() error {
if err := t.reporter.Close(); err != nil {
return err
}
if err := t.sampler.Close(); err != nil {
return err
}
return nil
}
func (t *houyiTracer) Sampler() Sampler {
return t.sampler
}
func (t *houyiTracer) Tags() []opentracing.Tag {
return t.tags
}
func (t *houyiTracer) reportSpan(span *Span) {
t.reporter.Report(span)
t.spanAllocator.Put(span)
}