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tracer.go
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tracer.go
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// Copyright 2020 Nelson Elhage
//
// 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:https://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 tracing
import "time"
type Tracer interface {
Submit(span *Span)
}
type SpanBuilder struct {
tracer Tracer
span Span
}
func (sp *SpanBuilder) ensureFields() {
if sp.span.Fields == nil {
sp.span.Fields = make(map[string]interface{})
}
}
func (sp *SpanBuilder) AddField(name string, v interface{}) {
sp.ensureFields()
sp.span.Fields[name] = v
}
func (sp *SpanBuilder) End() *Span {
sp.span.Duration = time.Since(sp.span.Start)
if sp.tracer != nil {
sp.tracer.Submit(&sp.span)
}
return &sp.span
}
func (sp *SpanBuilder) TraceId() string {
return sp.span.TraceId
}
func (sp *SpanBuilder) Id() string {
return sp.span.SpanId
}
func (sp *SpanBuilder) WillSubmit() bool {
return sp.tracer != nil
}
func (sp *SpanBuilder) Propagation() *Propagation {
return &Propagation{
TraceId: sp.span.TraceId,
ParentId: sp.span.SpanId,
}
}