Fantom-foundation/go-lachesis

package tracing

import (
    opentracing "github.com/opentracing/opentracing-go"
    jaegercfg "github.com/uber/jaeger-client-go/config"
    jaegerlog "github.com/uber/jaeger-client-go/log"
    "github.com/uber/jaeger-lib/metrics"
    "gopkg.in/urfave/cli.v1"

    "github.com/Fantom-foundation/go-lachesis/tracing"
)

var EnableFlag = cli.BoolFlag{
    Name:  "tracing",
    Usage: "Enable traces collection and reporting",
}

func Start(ctx *cli.Context) (stop func(), err error) {
    stop = func() {}

    if !ctx.Bool(EnableFlag.Name) {
        return
    }

    var cfg *jaegercfg.Configuration
    cfg, err = jaegercfg.FromEnv()
    if err != nil {
        return
    }

    cfg.ServiceName = "lachesis"

    tracer, closer, err := cfg.NewTracer(
        jaegercfg.Logger(jaegerlog.StdLogger),
        jaegercfg.Metrics(metrics.NullFactory),
    )
    if err != nil {
        return
    }
    stop = func() {
        closer.Close()
    }

    opentracing.SetGlobalTracer(tracer)
    tracing.SetEnabled(true)
    return
}