371 lines
10 KiB
Go
371 lines
10 KiB
Go
// Copyright (c) 2016 Uber Technologies, Inc.
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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package jaeger
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import (
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"fmt"
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"io"
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"os"
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"reflect"
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"sync"
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"time"
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"github.com/opentracing/opentracing-go"
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"github.com/opentracing/opentracing-go/ext"
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"github.com/uber/jaeger-client-go/log"
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"github.com/uber/jaeger-client-go/utils"
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)
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// Tracer implements opentracing.Tracer.
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type Tracer struct {
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serviceName string
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hostIPv4 uint32 // this is for zipkin endpoint conversion
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sampler Sampler
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reporter Reporter
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metrics Metrics
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logger log.Logger
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timeNow func() time.Time
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randomNumber func() uint64
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options struct {
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poolSpans bool
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gen128Bit bool // whether to generate 128bit trace IDs
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zipkinSharedRPCSpan bool
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// more options to come
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}
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// pool for Span objects
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spanPool sync.Pool
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injectors map[interface{}]Injector
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extractors map[interface{}]Extractor
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observer compositeObserver
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tags []Tag
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}
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// NewTracer creates Tracer implementation that reports tracing to Jaeger.
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// The returned io.Closer can be used in shutdown hooks to ensure that the internal
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// queue of the Reporter is drained and all buffered spans are submitted to collectors.
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func NewTracer(
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serviceName string,
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sampler Sampler,
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reporter Reporter,
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options ...TracerOption,
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) (opentracing.Tracer, io.Closer) {
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t := &Tracer{
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serviceName: serviceName,
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sampler: sampler,
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reporter: reporter,
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injectors: make(map[interface{}]Injector),
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extractors: make(map[interface{}]Extractor),
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metrics: *NewNullMetrics(),
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spanPool: sync.Pool{New: func() interface{} {
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return &Span{}
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}},
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}
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// register default injectors/extractors
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textPropagator := newTextMapPropagator(t)
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t.injectors[opentracing.TextMap] = textPropagator
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t.extractors[opentracing.TextMap] = textPropagator
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httpHeaderPropagator := newHTTPHeaderPropagator(t)
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t.injectors[opentracing.HTTPHeaders] = httpHeaderPropagator
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t.extractors[opentracing.HTTPHeaders] = httpHeaderPropagator
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binaryPropagator := newBinaryPropagator(t)
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t.injectors[opentracing.Binary] = binaryPropagator
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t.extractors[opentracing.Binary] = binaryPropagator
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// TODO remove after TChannel supports OpenTracing
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interopPropagator := &jaegerTraceContextPropagator{tracer: t}
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t.injectors[SpanContextFormat] = interopPropagator
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t.extractors[SpanContextFormat] = interopPropagator
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zipkinPropagator := &zipkinPropagator{tracer: t}
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t.injectors[ZipkinSpanFormat] = zipkinPropagator
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t.extractors[ZipkinSpanFormat] = zipkinPropagator
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for _, option := range options {
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option(t)
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}
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if t.randomNumber == nil {
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rng := utils.NewRand(time.Now().UnixNano())
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t.randomNumber = func() uint64 {
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return uint64(rng.Int63())
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}
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}
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if t.timeNow == nil {
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t.timeNow = time.Now
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}
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if t.logger == nil {
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t.logger = log.NullLogger
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}
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// Set tracer-level tags
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t.tags = append(t.tags, Tag{key: JaegerClientVersionTagKey, value: JaegerClientVersion})
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if hostname, err := os.Hostname(); err == nil {
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t.tags = append(t.tags, Tag{key: TracerHostnameTagKey, value: hostname})
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}
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if ip, err := utils.HostIP(); err == nil {
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t.tags = append(t.tags, Tag{key: TracerIPTagKey, value: ip.String()})
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t.hostIPv4 = utils.PackIPAsUint32(ip)
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} else {
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t.logger.Error("Unable to determine this host's IP address: " + err.Error())
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}
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return t, t
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}
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// StartSpan implements StartSpan() method of opentracing.Tracer.
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func (t *Tracer) StartSpan(
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operationName string,
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options ...opentracing.StartSpanOption,
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) opentracing.Span {
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sso := opentracing.StartSpanOptions{}
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for _, o := range options {
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o.Apply(&sso)
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}
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return t.startSpanWithOptions(operationName, sso)
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}
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func (t *Tracer) startSpanWithOptions(
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operationName string,
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options opentracing.StartSpanOptions,
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) opentracing.Span {
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if options.StartTime.IsZero() {
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options.StartTime = t.timeNow()
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}
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var references []Reference
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var parent SpanContext
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var hasParent bool // need this because `parent` is a value, not reference
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for _, ref := range options.References {
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ctx, ok := ref.ReferencedContext.(SpanContext)
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if !ok {
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t.logger.Error(fmt.Sprintf(
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"Reference contains invalid type of SpanReference: %s",
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reflect.ValueOf(ref.ReferencedContext)))
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continue
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}
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if !(ctx.IsValid() || ctx.isDebugIDContainerOnly() || len(ctx.baggage) != 0) {
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continue
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}
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references = append(references, Reference{Type: ref.Type, Context: ctx})
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if !hasParent {
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parent = ctx
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hasParent = ref.Type == opentracing.ChildOfRef
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}
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}
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if !hasParent && parent.IsValid() {
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// If ChildOfRef wasn't found but a FollowFromRef exists, use the context from
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// the FollowFromRef as the parent
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hasParent = true
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}
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rpcServer := false
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if v, ok := options.Tags[ext.SpanKindRPCServer.Key]; ok {
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rpcServer = (v == ext.SpanKindRPCServerEnum || v == string(ext.SpanKindRPCServerEnum))
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}
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var samplerTags []Tag
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var ctx SpanContext
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newTrace := false
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if !hasParent || !parent.IsValid() {
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newTrace = true
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ctx.traceID.Low = t.randomID()
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if t.options.gen128Bit {
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ctx.traceID.High = t.randomID()
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}
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ctx.spanID = SpanID(ctx.traceID.Low)
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ctx.parentID = 0
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ctx.flags = byte(0)
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if hasParent && parent.isDebugIDContainerOnly() {
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ctx.flags |= (flagSampled | flagDebug)
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samplerTags = []Tag{{key: JaegerDebugHeader, value: parent.debugID}}
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} else if sampled, tags := t.sampler.IsSampled(ctx.traceID, operationName); sampled {
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ctx.flags |= flagSampled
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samplerTags = tags
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}
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} else {
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ctx.traceID = parent.traceID
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if rpcServer && t.options.zipkinSharedRPCSpan {
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// Support Zipkin's one-span-per-RPC model
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ctx.spanID = parent.spanID
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ctx.parentID = parent.parentID
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} else {
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ctx.spanID = SpanID(t.randomID())
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ctx.parentID = parent.spanID
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}
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ctx.flags = parent.flags
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}
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if hasParent {
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// copy baggage items
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if l := len(parent.baggage); l > 0 {
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ctx.baggage = make(map[string]string, len(parent.baggage))
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for k, v := range parent.baggage {
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ctx.baggage[k] = v
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}
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}
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}
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sp := t.newSpan()
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sp.context = ctx
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sp.observer = t.observer.OnStartSpan(sp, operationName, options)
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return t.startSpanInternal(
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sp,
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operationName,
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options.StartTime,
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samplerTags,
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options.Tags,
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newTrace,
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rpcServer,
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references,
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)
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}
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// Inject implements Inject() method of opentracing.Tracer
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func (t *Tracer) Inject(ctx opentracing.SpanContext, format interface{}, carrier interface{}) error {
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c, ok := ctx.(SpanContext)
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if !ok {
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return opentracing.ErrInvalidSpanContext
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}
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if injector, ok := t.injectors[format]; ok {
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return injector.Inject(c, carrier)
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}
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return opentracing.ErrUnsupportedFormat
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}
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// Extract implements Extract() method of opentracing.Tracer
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func (t *Tracer) Extract(
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format interface{},
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carrier interface{},
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) (opentracing.SpanContext, error) {
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if extractor, ok := t.extractors[format]; ok {
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return extractor.Extract(carrier)
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}
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return nil, opentracing.ErrUnsupportedFormat
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}
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// Close releases all resources used by the Tracer and flushes any remaining buffered spans.
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func (t *Tracer) Close() error {
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t.reporter.Close()
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t.sampler.Close()
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return nil
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}
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// Tags returns a slice of tracer-level tags.
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func (t *Tracer) Tags() []opentracing.Tag {
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tags := make([]opentracing.Tag, len(t.tags))
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for i, tag := range t.tags {
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tags[i] = opentracing.Tag{Key: tag.key, Value: tag.value}
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}
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return tags
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}
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// newSpan returns an instance of a clean Span object.
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// If options.PoolSpans is true, the spans are retrieved from an object pool.
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func (t *Tracer) newSpan() *Span {
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if !t.options.poolSpans {
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return &Span{}
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}
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sp := t.spanPool.Get().(*Span)
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sp.context = emptyContext
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sp.tracer = nil
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sp.tags = nil
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sp.logs = nil
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return sp
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}
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func (t *Tracer) startSpanInternal(
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sp *Span,
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operationName string,
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startTime time.Time,
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internalTags []Tag,
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tags opentracing.Tags,
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newTrace bool,
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rpcServer bool,
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references []Reference,
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) *Span {
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sp.tracer = t
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sp.operationName = operationName
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sp.startTime = startTime
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sp.duration = 0
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sp.references = references
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sp.firstInProcess = rpcServer || sp.context.parentID == 0
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if len(tags) > 0 || len(internalTags) > 0 {
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sp.tags = make([]Tag, len(internalTags), len(tags)+len(internalTags))
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copy(sp.tags, internalTags)
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for k, v := range tags {
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sp.observer.OnSetTag(k, v)
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if k == string(ext.SamplingPriority) && setSamplingPriority(sp, v) {
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continue
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}
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sp.setTagNoLocking(k, v)
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}
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}
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// emit metrics
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t.metrics.SpansStarted.Inc(1)
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if sp.context.IsSampled() {
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t.metrics.SpansSampled.Inc(1)
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if newTrace {
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// We cannot simply check for parentID==0 because in Zipkin model the
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// server-side RPC span has the exact same trace/span/parent IDs as the
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// calling client-side span, but obviously the server side span is
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// no longer a root span of the trace.
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t.metrics.TracesStartedSampled.Inc(1)
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} else if sp.firstInProcess {
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t.metrics.TracesJoinedSampled.Inc(1)
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}
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} else {
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t.metrics.SpansNotSampled.Inc(1)
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if newTrace {
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t.metrics.TracesStartedNotSampled.Inc(1)
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} else if sp.firstInProcess {
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t.metrics.TracesJoinedNotSampled.Inc(1)
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}
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}
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return sp
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}
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func (t *Tracer) reportSpan(sp *Span) {
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t.metrics.SpansFinished.Inc(1)
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if sp.context.IsSampled() {
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t.reporter.Report(sp)
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}
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if t.options.poolSpans {
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t.spanPool.Put(sp)
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}
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}
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// randomID generates a random trace/span ID, using tracer.random() generator.
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// It never returns 0.
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func (t *Tracer) randomID() uint64 {
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val := t.randomNumber()
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for val == 0 {
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val = t.randomNumber()
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}
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return val
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}
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