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options.go
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options.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// 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 config
import (
opentracing "github.com/opentracing/opentracing-go"
"github.com/uber/jaeger-lib/metrics"
"github.com/uber/jaeger-client-go"
)
// Option is a function that sets some option on the client.
type Option func(c *Options)
// Options control behavior of the client.
type Options struct {
metrics metrics.Factory
logger jaeger.Logger
reporter jaeger.Reporter
contribObservers []jaeger.ContribObserver
observers []jaeger.Observer
gen128Bit bool
zipkinSharedRPCSpan bool
tags []opentracing.Tag
}
// Metrics creates an Option that initializes Metrics in the tracer,
// which is used to emit statistics about spans.
func Metrics(factory metrics.Factory) Option {
return func(c *Options) {
c.metrics = factory
}
}
// Logger can be provided to log Reporter errors, as well as to log spans
// if Reporter.LogSpans is set to true.
func Logger(logger jaeger.Logger) Option {
return func(c *Options) {
c.logger = logger
}
}
// Reporter can be provided explicitly to override the configuration.
// Useful for testing, e.g. by passing InMemoryReporter.
func Reporter(reporter jaeger.Reporter) Option {
return func(c *Options) {
c.reporter = reporter
}
}
// Observer can be registered with the Tracer to receive notifications about new Spans.
func Observer(observer jaeger.Observer) Option {
return func(c *Options) {
c.observers = append(c.observers, observer)
}
}
// ContribObserver can be registered with the Tracer to recieve notifications
// about new spans.
func ContribObserver(observer jaeger.ContribObserver) Option {
return func(c *Options) {
c.contribObservers = append(c.contribObservers, observer)
}
}
// Gen128Bit specifies whether to generate 128bit trace IDs.
func Gen128Bit(gen128Bit bool) Option {
return func(c *Options) {
c.gen128Bit = gen128Bit
}
}
// ZipkinSharedRPCSpan creates an option that enables sharing span ID between client
// and server spans a la zipkin. If false, client and server spans will be assigned
// different IDs.
func ZipkinSharedRPCSpan(zipkinSharedRPCSpan bool) Option {
return func(c *Options) {
c.zipkinSharedRPCSpan = zipkinSharedRPCSpan
}
}
// Tag creates an option that adds a tracer-level tag.
func Tag(key string, value interface{}) Option {
return func(c *Options) {
c.tags = append(c.tags, opentracing.Tag{Key: key, Value: value})
}
}
func applyOptions(options ...Option) Options {
opts := Options{}
for _, option := range options {
option(&opts)
}
if opts.metrics == nil {
opts.metrics = metrics.NullFactory
}
if opts.logger == nil {
opts.logger = jaeger.NullLogger
}
return opts
}