import (
    "context"

    "github.com/fredbi/go-trace/log"
	"go.opencensus.io/trace"
)

func tracedFunc() {
    ctx := context.Background()
    zlg, closer := log.MustGetLogger("root") // builds a named zap logger with sensible defaults
    defer closer()

    lgf := log.NewFactory(zlg) // builds a logger with trace propagation

    ctx, span := trace.StartSpan(ctx, "span name")
    defer span.End()
    lg := lgf.For(ctx)

    lg.Info("log propagated as a trace span")
}

import (
    "context"

    "github.com/fredbi/go-trace/log"
	"go.opentelemetry.io/otel"
)


func tracedFunc() {
    tracer := otel.Tracer("") // returns the global default tracer
    ctx := context.Background()
    zlg, closer := log.MustGetLogger("root")
    defer closer()

    lgf := log.NewFactory(zlg) // builds a logger with trace propagation

    ctx, span := tracer.Start(ctx, "span name")
    defer span.End()
    lg := lgf.For(ctx)

    lg.Info("log propagated as a trace span")
}

import (
    "context"

    "github.com/fredbi/go-trace/log"
    "github.com/fredbi/go-trace/opencensus/tracer"
)

type loggable struct {
    lgf log.Factory
}

func (l *loggable) Logger() log.Factory {
    return l.lgf
}

func tracedFunc() {
    zlg := log.MustGetLogger("root") // builds a named zap logger with sensible defaults
    lgf := log.NewFactory(zlg) // builds a logger with trace propagation
    component := loggable{lfg:  lgf}

    ctx, span, lg := tracer.StartSpan(context.Background(), component) // the span is named automatically from the calling function
    defer span.End()

    lg.Info("log propagated as a trace span")
}

import (
    "context"

    "github.com/fredbi/go-trace/log"
    "github.com/fredbi/go-trace/otel/tracer"
)

type loggable struct {
    lgf log.Factory
    tracer trace.Tracer
}

func (l *loggable) Logger() log.Factory {
    return l.lgf
}

// Tracer returns the configured tracer. If this method, is not provided,
// the default globally registered OTEL tracer is returned.
func (l *loggable) Tracer() trace.Tracer {
    return l.tracer 
}

func tracedFunc() {
    zlg := log.MustGetLogger("root") // builds a named zap logger with sensible defaults
    lgf := log.NewFactory(zlg, log.WithOTEL(true)) // builds a logger with trace propagation
    component := loggable{lfg:  lgf}

    ctx, span, lg := tracer.StartSpan(context.Background(), component) // the span is named automatically from the calling function
    defer span.End()

    lg.Info("log propagated as a trace span")
}