/
tracer.go
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/
tracer.go
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// Copyright (c) 2018 Palantir Technologies. All rights reserved.
//
// 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 wtracing
import (
"net"
)
type Tracer interface {
StartSpan(name string, options ...SpanOption) Span
}
type TracerOption interface {
apply(impl *TracerOptionImpl)
}
func FromTracerOptions(opts ...TracerOption) *TracerOptionImpl {
impl := &TracerOptionImpl{}
for _, opt := range opts {
if opt == nil {
continue
}
opt.apply(impl)
}
return impl
}
type tracerOptionFn func(impl *TracerOptionImpl)
func (t tracerOptionFn) apply(impl *TracerOptionImpl) {
t(impl)
}
type TracerOptionImpl struct {
Sampler Sampler
LocalEndpoint *Endpoint
}
type Sampler func(id uint64) bool
func WithSampler(sampler Sampler) TracerOption {
return tracerOptionFn(func(impl *TracerOptionImpl) {
impl.Sampler = sampler
})
}
func WithLocalEndpoint(endpoint *Endpoint) TracerOption {
return tracerOptionFn(func(impl *TracerOptionImpl) {
impl.LocalEndpoint = endpoint
})
}
type Endpoint struct {
ServiceName string
IPv4 net.IP
IPv6 net.IP
Port uint16
}