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stdout.go
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stdout.go
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/*
* Copyright 2018 The Trickster 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 stdout provides a Stdout Tracer
package stdout
import (
"github.com/trickstercache/trickster/v2/pkg/observability/tracing"
"github.com/trickstercache/trickster/v2/pkg/observability/tracing/options"
"go.opentelemetry.io/otel/attribute"
stdout "go.opentelemetry.io/otel/exporters/stdout/stdouttrace"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
)
// New returns a new Stdout Tracer
func New(opts *options.Options) (*tracing.Tracer, error) {
var exp *stdout.Exporter
var err error
o := []stdout.Option{}
if opts == nil {
opts = &options.Options{
SampleRate: 1,
ServiceName: options.DefaultTracerServiceName,
Provider: "stdout",
}
}
if opts != nil && opts.StdOutOptions != nil {
if opts.StdOutOptions.PrettyPrint {
o = append(o, stdout.WithPrettyPrint())
}
}
// Create Basic Stdout Exporter
exp, err = stdout.New(o...)
if err != nil {
return nil, err
}
var sampler sdktrace.Sampler
switch opts.SampleRate {
case 0:
sampler = sdktrace.NeverSample()
case 1:
sampler = sdktrace.AlwaysSample()
default:
sampler = sdktrace.TraceIDRatioBased(opts.SampleRate)
}
serviceKey := attribute.String("service.name", opts.ServiceName)
var tags []attribute.KeyValue
if opts.Tags != nil && len(opts.Tags) > 0 {
tags = make([]attribute.KeyValue, 1, len(opts.Tags)+1)
tags[0] = serviceKey
for k, v := range opts.Tags {
tags = append(tags, attribute.String(k, v))
}
} else {
tags = []attribute.KeyValue{serviceKey}
}
tp := sdktrace.NewTracerProvider(sdktrace.WithSyncer(exp),
sdktrace.WithSampler(sampler),
sdktrace.WithResource(resource.NewWithAttributes("", tags...)),
)
tracer := tp.Tracer(opts.Name)
return &tracing.Tracer{
Name: opts.Name,
Tracer: tracer,
Options: opts,
}, nil
}