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tracer.go
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tracer.go
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// Copyright 2016-2022 The Libsacloud 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 (
"github.com/sacloud/libsacloud/v2"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/trace"
)
type config struct {
Tracer trace.Tracer
TracerProvider trace.TracerProvider
SpanStartOptions []trace.SpanStartOption
}
type Option interface {
Apply(*config)
}
type OptionFunc func(*config)
func (o OptionFunc) Apply(c *config) {
o(c)
}
func newConfig(opts ...Option) *config {
c := &config{
TracerProvider: otel.GetTracerProvider(),
}
for _, opt := range opts {
opt.Apply(c)
}
c.Tracer = c.TracerProvider.Tracer(
"github.com/sacloud/libsacloud",
trace.WithInstrumentationVersion(libsacloud.Version),
)
return c
}
func WithTracerProvider(provider trace.TracerProvider) Option {
return OptionFunc(func(cfg *config) {
cfg.TracerProvider = provider
})
}
func WithSpanOptions(opts ...trace.SpanStartOption) Option {
return OptionFunc(func(c *config) {
c.SpanStartOptions = append(c.SpanStartOptions, opts...)
})
}