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tracer.go
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tracer.go
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package ginplus
import (
"time"
"github.com/gin-gonic/gin"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/exporters/jaeger"
"go.opentelemetry.io/otel/sdk/resource"
tracesdk "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.21.0"
oteltrace "go.opentelemetry.io/otel/trace"
"gorm.io/gorm"
)
// 告诉编译器这个结构体实现了gorm.Plugin接口
var _ gorm.Plugin = (*OpentracingPlugin)(nil)
type tracingConfig struct {
// URL 上报地址
URL string
KeyValue func(c *gin.Context) []attribute.KeyValue
}
type TracingOption func(*tracingConfig)
// WithTracingURL 设置上报地址
func WithTracingURL(url string) TracingOption {
return func(c *tracingConfig) {
c.URL = url
}
}
// WithTracingKeyValueFunc 设置KeyValueFunc
func WithTracingKeyValueFunc(keyValue func(c *gin.Context) []attribute.KeyValue) TracingOption {
return func(c *tracingConfig) {
c.KeyValue = keyValue
}
}
func defaultKeyValueFunc(c *gin.Context) []attribute.KeyValue {
return []attribute.KeyValue{
attribute.String("http.method", c.Request.Method),
attribute.String("http.host", c.Request.Host),
attribute.String("http.user_agent", c.Request.UserAgent()),
attribute.String("http.client_ip", c.ClientIP()),
}
}
func tracerProvider(url, serviceName, environment, id string) *tracesdk.TracerProvider {
// Create the Jaeger exporter
exp, err := jaeger.New(jaeger.WithCollectorEndpoint(jaeger.WithEndpoint(url)))
if err != nil {
panic(err)
}
tp := tracesdk.NewTracerProvider(
// Always be sure to batch in production.
tracesdk.WithBatcher(exp),
// Record information about this application in a Resource.
tracesdk.WithResource(resource.NewWithAttributes(
semconv.SchemaURL,
semconv.ServiceNameKey.String(serviceName),
attribute.String("environment", environment),
attribute.String("ID", id),
)),
)
otel.SetTracerProvider(tp)
return tp
}
const gormSpanKey = "__gorm_span"
const gormTime = "__gorm_time"
func before(db *gorm.DB) {
// 先从父级spans生成子span ---> 这里命名为gorm,但实际上可以自定义
// 自己喜欢的operationName
ctx, span := otel.Tracer("gorm").Start(db.Statement.Context, "gorm")
// 利用db实例去传递span
db.InstanceSet(gormSpanKey, span)
db.InstanceSet(gormTime, time.Now())
// 设置context
db.WithContext(ctx)
}
func after(db *gorm.DB) {
// 从GORM的DB实例中取出span
_span, isExist := db.InstanceGet(gormSpanKey)
if !isExist {
// 不存在就直接抛弃掉
return
}
// 断言进行类型转换
span, ok := _span.(oteltrace.Span)
if !ok {
return
}
defer span.End()
// Error
if db.Error != nil {
span.SetAttributes(attribute.String("error", db.Error.Error()))
}
// sql --> 写法来源GORM V2的日志
span.SetAttributes(attribute.String("sql", db.Dialector.Explain(db.Statement.SQL.String(), db.Statement.Vars...)))
// rows
span.SetAttributes(attribute.Int64("rows", db.RowsAffected))
// elapsed
_time, isExist := db.InstanceGet(gormTime)
if !isExist {
return
}
startTime, ok := _time.(time.Time)
if ok {
span.SetAttributes(attribute.String("elapsed", time.Since(startTime).String()))
}
}
const (
callBackBeforeName = "opentracing:before"
callBackAfterName = "opentracing:after"
)
type OpentracingPlugin struct{}
// NewOpentracingPlugin 创建一个opentracing插件
func NewOpentracingPlugin() *OpentracingPlugin {
return &OpentracingPlugin{}
}
func (op *OpentracingPlugin) Name() string {
return "opentracingPlugin"
}
func (op *OpentracingPlugin) Initialize(db *gorm.DB) (err error) {
// 开始前 - 并不是都用相同的方法,可以自己自定义
if err = db.Callback().Create().Before("gorm:before_create").Register(callBackBeforeName, before); err != nil {
return err
}
if err = db.Callback().Query().Before("gorm:query").Register(callBackBeforeName, before); err != nil {
return err
}
if err = db.Callback().Delete().Before("gorm:before_delete").Register(callBackBeforeName, before); err != nil {
return err
}
if err = db.Callback().Update().Before("gorm:setup_reflect_value").Register(callBackBeforeName, before); err != nil {
return err
}
if err = db.Callback().Row().Before("gorm:row").Register(callBackBeforeName, before); err != nil {
return err
}
if err = db.Callback().Raw().Before("gorm:raw").Register(callBackBeforeName, before); err != nil {
return err
}
// 结束后 - 并不是都用相同的方法,可以自己自定义
if err = db.Callback().Create().After("gorm:after_create").Register(callBackAfterName, after); err != nil {
return err
}
if err = db.Callback().Query().After("gorm:after_query").Register(callBackAfterName, after); err != nil {
return err
}
if err = db.Callback().Delete().After("gorm:after_delete").Register(callBackAfterName, after); err != nil {
return err
}
if err = db.Callback().Update().After("gorm:after_update").Register(callBackAfterName, after); err != nil {
return err
}
if err = db.Callback().Row().After("gorm:row").Register(callBackAfterName, after); err != nil {
return err
}
if err = db.Callback().Raw().After("gorm:raw").Register(callBackAfterName, after); err != nil {
return err
}
return
}