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package opentelemetry
import (
"gitee.com/mosache/YFrame/rest"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/trace"
)
const instrumentationName = "gitee.com/mosache/YFrame/rest/middle/opentelemetry"
type MiddlewareBuilder struct {
Tracer trace.Tracer
}
func (m MiddlewareBuilder) Build() rest.MiddleWare {
if m.Tracer == nil {
m.Tracer = otel.GetTracerProvider().Tracer(instrumentationName)
}
return func(next rest.HandleFunc) rest.HandleFunc {
return func(ctx *rest.Context) {
reqCtx := ctx.Req.Context()
reqCtx = otel.GetTextMapPropagator().Extract(reqCtx, propagation.HeaderCarrier(ctx.Req.Header))
reqCtx, span := m.Tracer.Start(reqCtx, "unknown")
defer span.End()
span.SetAttributes(attribute.String("http.method", ctx.Req.Method))
span.SetAttributes(attribute.String("http.url", ctx.Req.URL.String()))
ctx.Req = ctx.Req.WithContext(reqCtx)
next(ctx)
span.SetName(ctx.MatchedRoute)
span.SetAttributes(attribute.Int("http.status", ctx.RespStatusCode))
}
}
}
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