mirror of
https://github.com/1f349/dendrite.git
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102 lines
3.3 KiB
Go
102 lines
3.3 KiB
Go
// Copyright (c) 2017 Uber Technologies, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package server
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import (
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"fmt"
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"github.com/opentracing/opentracing-go"
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"github.com/opentracing/opentracing-go/ext"
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"golang.org/x/net/context"
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"github.com/uber/jaeger-client-go"
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"github.com/uber/jaeger-client-go/crossdock/common"
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"github.com/uber/jaeger-client-go/crossdock/log"
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"github.com/uber/jaeger-client-go/crossdock/thrift/tracetest"
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)
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func (s *Server) doStartTrace(req *tracetest.StartTraceRequest) (*tracetest.TraceResponse, error) {
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span := s.Tracer.StartSpan(req.ServerRole)
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if req.Sampled {
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ext.SamplingPriority.Set(span, 1)
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}
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span.SetBaggageItem(BaggageKey, req.Baggage)
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defer span.Finish()
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ctx := opentracing.ContextWithSpan(context.Background(), span)
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return s.prepareResponse(ctx, req.ServerRole, req.Downstream)
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}
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func (s *Server) doJoinTrace(ctx context.Context, req *tracetest.JoinTraceRequest) (*tracetest.TraceResponse, error) {
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return s.prepareResponse(ctx, req.ServerRole, req.Downstream)
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}
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func (s *Server) prepareResponse(ctx context.Context, role string, reqDwn *tracetest.Downstream) (*tracetest.TraceResponse, error) {
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observedSpan, err := observeSpan(ctx, s.Tracer)
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if err != nil {
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return nil, err
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}
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resp := tracetest.NewTraceResponse()
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resp.Span = observedSpan
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if reqDwn != nil {
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downstreamResp, err := s.callDownstream(ctx, role, reqDwn)
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if err != nil {
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return nil, err
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}
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resp.Downstream = downstreamResp
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}
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return resp, nil
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}
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func (s *Server) callDownstream(ctx context.Context, role string, downstream *tracetest.Downstream) (*tracetest.TraceResponse, error) {
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switch downstream.Transport {
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case tracetest.Transport_HTTP:
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return s.callDownstreamHTTP(ctx, downstream)
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case tracetest.Transport_TCHANNEL:
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return s.callDownstreamTChannel(ctx, downstream)
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case tracetest.Transport_DUMMY:
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return &tracetest.TraceResponse{NotImplementedError: "DUMMY transport not implemented"}, nil
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default:
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return nil, errUnrecognizedProtocol
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}
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}
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func (s *Server) callDownstreamHTTP(ctx context.Context, target *tracetest.Downstream) (*tracetest.TraceResponse, error) {
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req := &tracetest.JoinTraceRequest{
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ServerRole: target.ServerRole,
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Downstream: target.Downstream,
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}
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url := fmt.Sprintf("http://%s:%s/join_trace", target.Host, target.Port)
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log.Printf("Calling downstream service '%s' at %s", target.ServiceName, url)
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return common.PostJSON(ctx, url, req)
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}
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func observeSpan(ctx context.Context, tracer opentracing.Tracer) (*tracetest.ObservedSpan, error) {
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span := opentracing.SpanFromContext(ctx)
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if span == nil {
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return nil, errNoSpanObserved
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}
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sc := span.Context().(jaeger.SpanContext)
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observedSpan := tracetest.NewObservedSpan()
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observedSpan.TraceId = sc.TraceID().String()
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observedSpan.Sampled = sc.IsSampled()
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observedSpan.Baggage = span.BaggageItem(BaggageKey)
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return observedSpan, nil
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}
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