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trace.go
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trace.go
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// Copyright (c) 2016 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package server
import (
"fmt"
"github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/ext"
"golang.org/x/net/context"
"github.com/uber/jaeger-client-go"
"github.com/uber/jaeger-client-go/crossdock/common"
"github.com/uber/jaeger-client-go/crossdock/log"
"github.com/uber/jaeger-client-go/crossdock/thrift/tracetest"
)
func (s *Server) doStartTrace(req *tracetest.StartTraceRequest) (*tracetest.TraceResponse, error) {
span := s.Tracer.StartSpan(req.ServerRole)
if req.Sampled {
ext.SamplingPriority.Set(span, 1)
}
span.SetBaggageItem(BaggageKey, req.Baggage)
defer span.Finish()
ctx := opentracing.ContextWithSpan(context.Background(), span)
return s.prepareResponse(ctx, req.ServerRole, req.Downstream)
}
func (s *Server) doJoinTrace(ctx context.Context, req *tracetest.JoinTraceRequest) (*tracetest.TraceResponse, error) {
return s.prepareResponse(ctx, req.ServerRole, req.Downstream)
}
func (s *Server) prepareResponse(ctx context.Context, role string, reqDwn *tracetest.Downstream) (*tracetest.TraceResponse, error) {
observedSpan, err := observeSpan(ctx, s.Tracer)
if err != nil {
return nil, err
}
resp := tracetest.NewTraceResponse()
resp.Span = observedSpan
if reqDwn != nil {
downstreamResp, err := s.callDownstream(ctx, role, reqDwn)
if err != nil {
return nil, err
}
resp.Downstream = downstreamResp
}
return resp, nil
}
func (s *Server) callDownstream(ctx context.Context, role string, downstream *tracetest.Downstream) (*tracetest.TraceResponse, error) {
switch downstream.Transport {
case tracetest.Transport_HTTP:
return s.callDownstreamHTTP(ctx, downstream)
case tracetest.Transport_TCHANNEL:
return s.callDownstreamTChannel(ctx, downstream)
case tracetest.Transport_DUMMY:
return &tracetest.TraceResponse{NotImplementedError: "DUMMY transport not implemented"}, nil
default:
return nil, errUnrecognizedProtocol
}
}
func (s *Server) callDownstreamHTTP(ctx context.Context, target *tracetest.Downstream) (*tracetest.TraceResponse, error) {
req := &tracetest.JoinTraceRequest{
ServerRole: target.ServerRole,
Downstream: target.Downstream,
}
url := fmt.Sprintf("http://%s:%s/join_trace", target.Host, target.Port)
log.Printf("Calling downstream service '%s' at %s", target.ServiceName, url)
return common.PostJSON(ctx, url, req)
}
func observeSpan(ctx context.Context, tracer opentracing.Tracer) (*tracetest.ObservedSpan, error) {
span := opentracing.SpanFromContext(ctx)
if span == nil {
return nil, errNoSpanObserved
}
sc := span.Context().(jaeger.SpanContext)
observedSpan := tracetest.NewObservedSpan()
observedSpan.TraceId = sc.TraceID().String()
observedSpan.Sampled = sc.IsSampled()
observedSpan.Baggage = span.BaggageItem(BaggageKey)
return observedSpan, nil
}