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restful.go
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restful.go
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// Unless explicitly stated otherwise all files in this repository are licensed
// under the Apache License Version 2.0.
// This product includes software developed at Datadog (https://www.datadoghq.com/).
// Copyright 2016 Datadog, Inc.
// Package restful provides functions to trace the emicklei/go-restful package (https://github.com/emicklei/go-restful).
package restful
import (
"math"
"gopkg.in/DataDog/dd-trace-go.v1/contrib/internal/httptrace"
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace"
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/ext"
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer"
"gopkg.in/DataDog/dd-trace-go.v1/internal/log"
"github.com/emicklei/go-restful"
)
// FilterFunc returns a restful.FilterFunction which will automatically trace incoming request.
func FilterFunc(configOpts ...Option) restful.FilterFunction {
cfg := newConfig()
for _, opt := range configOpts {
opt(cfg)
}
log.Debug("contrib/emicklei/go-restful: Creating tracing filter: %#v", cfg)
spanOpts := []ddtrace.StartSpanOption{tracer.ServiceName(cfg.serviceName)}
return func(req *restful.Request, resp *restful.Response, chain *restful.FilterChain) {
spanOpts := append(spanOpts, tracer.ResourceName(req.SelectedRoutePath()))
if !math.IsNaN(cfg.analyticsRate) {
spanOpts = append(spanOpts, tracer.Tag(ext.EventSampleRate, cfg.analyticsRate))
}
span, ctx := httptrace.StartRequestSpan(req.Request, spanOpts...)
defer func() {
httptrace.FinishRequestSpan(span, resp.StatusCode(), tracer.WithError(resp.Error()))
}()
// pass the span through the request context
req.Request = req.Request.WithContext(ctx)
chain.ProcessFilter(req, resp)
}
}
// Filter is deprecated. Please use FilterFunc.
func Filter(req *restful.Request, resp *restful.Response, chain *restful.FilterChain) {
span, ctx := httptrace.StartRequestSpan(req.Request, tracer.ResourceName(req.SelectedRoutePath()))
defer func() {
httptrace.FinishRequestSpan(span, resp.StatusCode(), tracer.WithError(resp.Error()))
}()
// pass the span through the request context
req.Request = req.Request.WithContext(ctx)
chain.ProcessFilter(req, resp)
}