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trace.go
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trace.go
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// Copyright 2020 Douyu
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package xtrace
import (
"context"
"github.com/douyu/jupiter/pkg/xlog"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/trace"
)
// SetGlobalTracer ...
func SetGlobalTracer(tp trace.TracerProvider) {
xlog.Jupiter().Info("set global tracer", xlog.FieldMod("trace"))
otel.SetTracerProvider(tp)
}
type options struct {
propagator propagation.TextMapPropagator
}
// Option is tracing option.
type Option func(*options)
// Tracer is otel span tracer
type Tracer struct {
tracer trace.Tracer
kind trace.SpanKind
opt *options
}
// NewTracer create tracer instance
func NewTracer(kind trace.SpanKind, opts ...Option) *Tracer {
op := options{
propagator: propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}),
//propagator: propagation.NewCompositeTextMapPropagator(Metadata{}, propagation.Baggage{}, propagation.TraceContext{}),
}
for _, o := range opts {
o(&op)
}
return &Tracer{tracer: otel.Tracer("jupiter"), kind: kind, opt: &op}
}
// Start start tracing span
func (t *Tracer) Start(ctx context.Context, operation string, carrier propagation.TextMapCarrier, opts ...trace.SpanStartOption) (context.Context, trace.Span) {
if (t.kind == trace.SpanKindServer || t.kind == trace.SpanKindConsumer) && carrier != nil {
ctx = t.opt.propagator.Extract(ctx, carrier)
}
opts = append(opts, trace.WithSpanKind(t.kind))
ctx, span := t.tracer.Start(ctx, operation, opts...)
if (t.kind == trace.SpanKindClient || t.kind == trace.SpanKindProducer) && carrier != nil {
t.opt.propagator.Inject(ctx, carrier)
}
return ctx, span
}