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trace.go
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trace.go
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//
// Copyright (C) 2019-2024 vdaas.org vald team <vald@vdaas.org>
//
// 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
//
// https://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 trace provides trace functions.
package trace
import (
"context"
"reflect"
"github.com/vdaas/vald/internal/errors"
"github.com/vdaas/vald/internal/log"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/trace"
)
const (
tracerName = "vdaas/vald"
)
var (
enabled bool
FromContext = trace.SpanFromContext
)
type Span = trace.Span
type Tracer interface {
Start(ctx context.Context) error
}
type tracer struct{}
func StartSpan(ctx context.Context, name string, opts ...trace.SpanStartOption) (context.Context, Span) {
if !enabled {
return ctx, nil
}
return otel.Tracer(tracerName).Start(ctx, name, opts...)
}
func New(opts ...TraceOption) (Tracer, error) {
t := &tracer{}
for _, opt := range append(traceDefaultOpts, opts...) {
if err := opt(t); err != nil {
oerr := errors.ErrOptionFailed(err, reflect.ValueOf(err))
e := &errors.ErrCriticalOption{}
if errors.As(oerr, &e) {
log.Error(oerr)
return nil, oerr
}
log.Warn(oerr)
}
}
enabled = true
return t, nil
}
func (*tracer) Start(context.Context) error {
otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))
return nil
}