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trace.go
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trace.go
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// 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.
//
// author: wsfuyibing <websearch@163.com>
// date: 2023-03-03
package tracers
import (
"context"
"github.com/fuyibing/log/v5/configurer"
"github.com/fuyibing/log/v5/loggers"
"net/http"
)
const (
ContextKey = "__LOG_TRACE_CONTEXT_KEY__"
)
type (
// Trace
// 跨度组件.
Trace interface {
// Context
// 上下文.
Context() context.Context
// Kv
// 链路Key/Value属性.
Kv() loggers.Kv
// Name
// 链路名.
Name() string
// New
// 创建跨度.
//
// 基于 Trace 生成新的链路跨度 Span.
New(name string) Span
// SpanId
// 跨度ID.
SpanId() SpanId
// TraceId
// 链路ID.
TraceId() TraceId
}
// 链路组件.
trace struct {
ctx context.Context
kv loggers.Kv
name string
spanId SpanId
traceId TraceId
}
)
// /////////////////////////////////////////////////////////////////////////////
// Interface methods
// /////////////////////////////////////////////////////////////////////////////
func (o *trace) Context() context.Context { return o.ctx }
func (o *trace) Kv() loggers.Kv { return o.kv }
func (o *trace) Name() string { return o.name }
func (o *trace) New(name string) Span {
v := (&span{name: name}).init()
v.kv.Copy(o.kv)
v.parentSpanId = o.spanId
v.trace = o
v.ctx = context.WithValue(o.ctx, ContextKey, v)
return v
}
func (o *trace) SpanId() SpanId { return o.spanId }
func (o *trace) TraceId() TraceId { return o.traceId }
// /////////////////////////////////////////////////////////////////////////////
// Access and constructor
// /////////////////////////////////////////////////////////////////////////////
func (o *trace) init() *trace {
o.kv = loggers.Kv{}
return o
}
func (o *trace) parseRequestField(req *http.Request) {
o.kv.Add("http.protocol", req.Proto).
Add("http.request.header", req.Header).
Add("http.request.method", req.Method).
Add("http.request.url", req.RequestURI).
Add("http.user.agent", req.UserAgent())
}
func (o *trace) parseRequestId(req *http.Request) {
// 获取 X-B3 Trace id.
//
// {
// "X-B3-Traceid": "trace id"
// }
if s := req.Header.Get(configurer.Config.GetOpenTracingTraceId()); s != "" {
if v := Operator.Generator().TraceIdFromHex(s); v.IsValid() {
o.traceId = v
}
}
// 获取 X-B3 Span id.
//
// {
// "X-B3-Spanid": "span id"
// }
if s := req.Header.Get(configurer.Config.GetOpenTracingSpanId()); s != "" {
if v := Operator.Generator().SpanIdFromHex(s); v.IsValid() {
o.spanId = v
}
}
}