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tracer.go
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tracer.go
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package tracer
import (
"log"
"os"
"path/filepath"
"strconv"
lightstep "github.com/lightstep/lightstep-tracer-go"
opentracing "github.com/opentracing/opentracing-go"
jaeger "github.com/uber/jaeger-client-go"
jaegercfg "github.com/uber/jaeger-client-go/config"
jaegerlog "github.com/uber/jaeger-client-go/log"
jaegermetrics "github.com/uber/jaeger-lib/metrics"
)
var (
lightstepAccessToken = os.Getenv("LIGHTSTEP_ACCESS_TOKEN")
lightstepProject = os.Getenv("LIGHTSTEP_PROJECT")
lightstepIncludeSensitive, _ = strconv.ParseBool(os.Getenv("LIGHTSTEP_INCLUDE_SENSITIVE"))
useJaeger, _ = strconv.ParseBool(os.Getenv("USE_JAEGER"))
)
func Init() {
serviceName := filepath.Base(os.Args[0])
if useJaeger {
log.Println("Distributed tracing enabled", "tracer", "jaeger")
cfg := jaegercfg.Configuration{
Sampler: &jaegercfg.SamplerConfig{
Type: jaeger.SamplerTypeConst,
Param: 1,
},
}
_, err := cfg.InitGlobalTracer(
serviceName,
jaegercfg.Logger(jaegerlog.StdLogger),
jaegercfg.Metrics(jaegermetrics.NullFactory),
)
if err != nil {
log.Printf("Could not initialize jaeger tracer: %s", err.Error())
return
}
return
}
if lightstepAccessToken != "" {
log.Println("Distributed tracing enabled", "tracer", "Lightstep")
opentracing.InitGlobalTracer(lightstep.NewTracer(lightstep.Options{
AccessToken: lightstepAccessToken,
UseGRPC: true,
Tags: opentracing.Tags{
lightstep.ComponentNameKey: serviceName,
},
DropSpanLogs: !lightstepIncludeSensitive,
}))
// Ignore warnings from the tracer about SetTag calls with unrecognized value types. The
// github.com/lightstep/lightstep-tracer-go package calls fmt.Sprintf("%#v", ...) on them, which is fine.
defaultHandler := lightstep.NewEventLogOneError()
lightstep.SetGlobalEventHandler(func(e lightstep.Event) {
if _, ok := e.(lightstep.EventUnsupportedValue); ok {
// ignore
} else {
defaultHandler(e)
}
})
}
}