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provider.go
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provider.go
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// Copyright The Perses Authors
// 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 otel
import (
"context"
"fmt"
"time"
"github.com/perses/common/async"
"github.com/prometheus/common/version"
"github.com/sirupsen/logrus"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/sdk/resource"
"go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.12.0"
)
type Builder struct {
resource *resource.Resource
exporter trace.SpanExporter
provider *trace.TracerProvider
err error
}
func NewBuilder() *Builder {
return &Builder{}
}
func (b *Builder) WithDefaultResource(serviceName string) *Builder {
b.resource, b.err = b.createDefaultResource(serviceName)
return b
}
func (b *Builder) SetResource(r *resource.Resource) *Builder {
b.resource = r
return b
}
func (b *Builder) SetExporter(exp trace.SpanExporter) *Builder {
b.exporter = exp
return b
}
func (b *Builder) SetProvider(provider *trace.TracerProvider) *Builder {
b.provider = provider
return b
}
func (b *Builder) Build() (async.Task, error) {
if b.err != nil {
return nil, b.err
}
if b.provider != nil {
return &provider{provider: b.provider}, nil
}
if b.resource == nil {
return nil, fmt.Errorf("otel resource is empty, use the default one or set one")
}
otelProvider := trace.NewTracerProvider(
trace.WithBatcher(b.exporter),
trace.WithResource(b.resource))
return &provider{provider: otelProvider}, nil
}
func (b *Builder) createDefaultResource(serviceName string) (*resource.Resource, error) {
return resource.Merge(
resource.Default(),
resource.NewWithAttributes(
semconv.SchemaURL,
semconv.ServiceNameKey.String(serviceName),
semconv.ServiceVersionKey.String(version.Version)))
}
type otelErrHandler func(err error)
func (o otelErrHandler) Handle(err error) {
o(err)
}
type provider struct {
async.Task
provider *trace.TracerProvider
}
func (p *provider) String() string {
return "otel provider"
}
func (p *provider) Initialize() error {
return nil
}
func (p *provider) Execute(ctx context.Context, _ context.CancelFunc) error {
// start provider
otel.SetTracerProvider(p.provider)
otel.SetErrorHandler(otelErrHandler(func(err error) {
logrus.WithError(err).Error("OpenTelemetry handler returned an error")
}))
<-ctx.Done()
return nil
}
func (p *provider) Finalize() error {
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
return p.provider.Shutdown(ctx)
}