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tracer.go
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/
tracer.go
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package config
import (
"context"
"io"
"net/http"
"github.com/gin-gonic/gin"
"github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/ext"
"github.com/opentracing/opentracing-go/log"
llog "github.com/stonemylove/cc-lib/pkg/log"
"github.com/uber/jaeger-client-go"
jaegercfg "github.com/uber/jaeger-client-go/config"
"go.uber.org/zap"
)
// Tracer唐僧叨叨Tracer
type Tracer struct {
jaegerconfig jaegercfg.Configuration
cfg *Config
tracer opentracing.Tracer
closer io.Closer
llog.Log
}
// NewTracer NewTracer
func NewTracer(cfg *Config) (*Tracer, error) {
if !cfg.Tracing.On {
return &Tracer{
cfg: cfg,
}, nil
}
t := &Tracer{
cfg: cfg,
Log: llog.NewTLog("Tracer"),
}
t.jaegerconfig = jaegercfg.Configuration{
ServiceName: cfg.AppID,
Headers: &jaeger.HeadersConfig{
TraceContextHeaderName: "wukongchat-trace-id",
},
Sampler: &jaegercfg.SamplerConfig{
Type: jaeger.SamplerTypeConst,
Param: 1,
},
Reporter: &jaegercfg.ReporterConfig{
LogSpans: true,
LocalAgentHostPort: cfg.Tracing.Addr,
},
}
var err error
t.tracer, t.closer, err = t.jaegerconfig.New(cfg.AppID, jaegercfg.Logger(jaeger.StdLogger))
if err != nil {
return nil, err
}
opentracing.SetGlobalTracer(t.tracer)
return t, nil
}
// Close 关闭
func (t *Tracer) Close() error {
if t.closer != nil {
return t.closer.Close()
}
return nil
}
// StartSpanFromContext StartSpanFromContext
func (t *Tracer) StartSpanFromContext(ctx context.Context, operationName string, opts ...opentracing.StartSpanOption) (opentracing.Span, context.Context) {
if !t.cfg.Tracing.On {
return &EmptySpan{}, ctx
}
return opentracing.StartSpanFromContext(ctx, operationName, opts...)
}
// StartSpan StartSpan
func (t *Tracer) StartSpan(operationName string, opts ...opentracing.StartSpanOption) opentracing.Span {
if !t.cfg.Tracing.On {
return &EmptySpan{}
}
return t.tracer.StartSpan(operationName, opts...)
}
// ContextWithSpan ContextWithSpan
func (t *Tracer) ContextWithSpan(ctx context.Context, span opentracing.Span) context.Context {
return opentracing.ContextWithSpan(ctx, span)
}
// Inject Inject
func (t *Tracer) Inject(sm opentracing.SpanContext, format interface{}, carrier interface{}) error {
if !t.cfg.Tracing.On {
return nil
}
return t.tracer.Inject(sm, format, carrier)
}
// InjectHTTPHeader InjectHTTPHeader
func (t *Tracer) InjectHTTPHeader(sm opentracing.SpanContext, header http.Header) error {
if !t.cfg.Tracing.On {
return nil
}
return t.tracer.Inject(sm, opentracing.HTTPHeaders, opentracing.HTTPHeadersCarrier(header))
}
// Extract Extract
func (t *Tracer) Extract(format interface{}, carrier interface{}) (opentracing.SpanContext, error) {
if !t.cfg.Tracing.On {
return &EmptySpanContext{}, nil
}
return t.tracer.Extract(format, carrier)
}
// ExtractHTTPHeader ExtractHTTPHeader
func (t *Tracer) ExtractHTTPHeader(header http.Header) (opentracing.SpanContext, error) {
return t.Extract(opentracing.HTTPHeaders, opentracing.HTTPHeadersCarrier(header))
}
// GinMiddle gin的中间件
func (t *Tracer) GinMiddle() gin.HandlerFunc {
return func(c *gin.Context) {
var spanContext opentracing.SpanContext
if t.cfg.Tracing.On {
var parentSpan opentracing.Span
spCtx, err := t.ExtractHTTPHeader(c.Request.Header)
if err != nil {
//t.Warn("从http header里获取span失败!", zap.Error(err))
parentSpan, _ = t.StartSpanFromContext(context.Background(), c.FullPath())
} else {
parentSpan = t.StartSpan(
c.FullPath(),
opentracing.ChildOf(spCtx),
opentracing.Tag{Key: string(ext.Component), Value: "HTTP"},
)
}
defer parentSpan.Finish()
spanContext = parentSpan.Context()
} else {
spanContext = &EmptySpanContext{}
}
c.Set("spanContext", spanContext)
c.Next()
if t.cfg.Tracing.On {
err := t.InjectHTTPHeader(spanContext, c.Request.Header)
if err != nil {
t.Warn("注入tracing的http header失败!", zap.Error(err))
}
}
}
}
// EmptySpan 空的span
type EmptySpan struct {
}
// Finish Finish
func (e *EmptySpan) Finish() {
}
// FinishWithOptions FinishWithOptions
func (e *EmptySpan) FinishWithOptions(opts opentracing.FinishOptions) {
}
// Context Context
func (e *EmptySpan) Context() opentracing.SpanContext {
return nil
}
// SetOperationName SetOperationName
func (e *EmptySpan) SetOperationName(operationName string) opentracing.Span {
return e
}
// SetTag SetTag
func (e *EmptySpan) SetTag(key string, value interface{}) opentracing.Span {
return e
}
// LogFields LogFields
func (e *EmptySpan) LogFields(fields ...log.Field) {
}
// LogKV LogKV
func (e *EmptySpan) LogKV(alternatingKeyValues ...interface{}) {
}
// SetBaggageItem SetBaggageItem
func (e *EmptySpan) SetBaggageItem(restrictedKey, value string) opentracing.Span {
return e
}
// BaggageItem BaggageItem
func (e *EmptySpan) BaggageItem(restrictedKey string) string {
return ""
}
// Tracer Tracer
func (e *EmptySpan) Tracer() opentracing.Tracer {
return nil
}
// LogEvent LogEvent
func (e *EmptySpan) LogEvent(event string) {
}
// LogEventWithPayload LogEventWithPayload
func (e *EmptySpan) LogEventWithPayload(event string, payload interface{}) {
}
// Log Log
func (e *EmptySpan) Log(data opentracing.LogData) {
}
// EmptySpanContext EmptySpanContext
type EmptySpanContext struct {
}
// ForeachBaggageItem ForeachBaggageItem
func (e *EmptySpanContext) ForeachBaggageItem(handler func(k, v string) bool) {
}