V1.0.x (#1713)

* add jaeger config

* add probability

pkg/net/trace/config.go

@@ -58,7 +58,7 @@ func TracerFromEnvFlag() (Tracer, error) {
 		return nil, err
 	}
 	report := newReport(cfg.Network, cfg.Addr, time.Duration(cfg.Timeout), cfg.ProtocolVersion)
-	return NewTracer(env.AppID, report, cfg.DisableSample), nil
+	return NewTracer(env.AppID, report, cfg.DisableSample, _probability), nil
 }
 
 // Init init trace report.
@@ -71,5 +71,5 @@ func Init(cfg *Config) {
 		}
 	}
 	report := newReport(cfg.Network, cfg.Addr, time.Duration(cfg.Timeout), cfg.ProtocolVersion)
-	SetGlobalTracer(NewTracer(env.AppID, report, cfg.DisableSample))
+	SetGlobalTracer(NewTracer(env.AppID, report, cfg.DisableSample, _probability))
 }

pkg/net/trace/dapper.go

@@ -14,8 +14,8 @@ const (
 )
 
 // NewTracer new a tracer.
-func NewTracer(serviceName string, report reporter, disableSample bool) Tracer {
-	sampler := newSampler(_probability)
+func NewTracer(serviceName string, report reporter, disableSample bool, probability float32) Tracer {
+	sampler := newSampler(probability)
 
 	// default internal tags
 	tags := extendTag()

pkg/net/trace/jaeger/config.go

@@ -11,6 +11,7 @@ import (
 var (
 	_jaegerAppID    = env.AppID
 	_jaegerEndpoint = "http://127.0.0.1:9191"
+	_probability    = 0.00025
 )
 
 func init() {
@@ -27,7 +28,10 @@ func init() {
 }
 
 // Init Init
-func Init() {
-	c := &Config{Endpoint: _jaegerEndpoint, BatchSize: 120}
-	trace.SetGlobalTracer(trace.NewTracer(_jaegerAppID, newReport(c), true))
+func Init(cfg *Config) {
+	c := cfg
+	if c == nil {
+		c = &Config{AppID: _jaegerAppID, Endpoint: _jaegerEndpoint, BatchSize: 120, Probability: float32(_probability)}
+	}
+	trace.SetGlobalTracer(trace.NewTracer(c.AppID, newReport(c), true, c.Probability))
 }

pkg/net/trace/jaeger/jaeger.go

@@ -6,8 +6,10 @@ import (
 )
 
 type Config struct {
-	Endpoint  string
-	BatchSize int
+	AppID       string
+	Endpoint    string
+	BatchSize   int
+	Probability float32
 }
 
 type JaegerReporter struct {