/
datadog.go
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/
datadog.go
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/*
* Copyright 2018 AccelByte Inc
*
* 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.
*/
package datadog
import (
"errors"
"net/http"
"strconv"
"github.com/emicklei/go-restful"
"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"
)
// Start initiates the tracer
func Start(addr string, serviceName string, environment string, debugMode bool) {
tracer.Start(
tracer.WithAgentAddr(addr),
tracer.WithServiceName(serviceName),
tracer.WithGlobalTag(ext.Environment, environment),
tracer.WithDebugMode(debugMode))
}
// Trace is a filter that will trace incoming request
func Trace(req *restful.Request, resp *restful.Response, chain *restful.FilterChain) {
opts := []ddtrace.StartSpanOption{
tracer.ResourceName(req.SelectedRoutePath()),
tracer.SpanType(ext.SpanTypeWeb),
tracer.Tag(ext.HTTPMethod, req.Request.Method),
tracer.Tag(ext.HTTPURL, req.Request.URL.Path),
}
if spanctx, err := tracer.Extract(tracer.HTTPHeadersCarrier(req.Request.Header)); err == nil {
opts = append(opts, tracer.ChildOf(spanctx))
}
span, ctx := tracer.StartSpanFromContext(req.Request.Context(), "http.request", opts...)
defer span.Finish()
// pass the span through the request context
req.Request = req.Request.WithContext(ctx)
chain.ProcessFilter(req, resp)
span.SetTag(ext.HTTPCode, strconv.Itoa(resp.StatusCode()))
if resp.Error() != nil {
span.SetTag(ext.Error, resp.Error())
}
}
// Inject adds tracer header to a HTTP request
func Inject(outRequest *http.Request, restfulRequest *restful.Request) error {
span, ok := tracer.SpanFromContext(restfulRequest.Request.Context())
if !ok {
return errors.New("no trace context in the request, request is not instrumented")
}
return tracer.Inject(span.Context(), tracer.HTTPHeadersCarrier(outRequest.Header))
}