mirror of
https://github.com/1f349/dendrite.git
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74 lines
2.1 KiB
Go
74 lines
2.1 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 common
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import (
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"bytes"
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"encoding/json"
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"net/http"
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"github.com/uber/jaeger-client-go/crossdock/thrift/tracetest"
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"github.com/uber/jaeger-client-go/utils"
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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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)
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// PostJSON sends a POST request to `url` with body containing JSON-serialized `req`.
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// It injects tracing span into the headers (if found in the context).
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// It returns parsed TraceResponse, or error.
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func PostJSON(ctx context.Context, url string, req interface{}) (*tracetest.TraceResponse, error) {
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data, err := json.Marshal(req)
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if err != nil {
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return nil, err
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}
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httpReq, err := http.NewRequest("POST", url, bytes.NewBuffer(data))
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if err != nil {
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return nil, err
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}
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httpReq.Header.Set("Content-Type", "application/json")
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span, err := injectSpan(ctx, httpReq)
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if span != nil {
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defer span.Finish()
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}
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if err != nil {
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return nil, err
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}
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resp, err := http.DefaultClient.Do(httpReq)
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if err != nil {
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return nil, err
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}
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var result tracetest.TraceResponse
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err = utils.ReadJSON(resp, &result)
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return &result, err
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}
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func injectSpan(ctx context.Context, req *http.Request) (opentracing.Span, error) {
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span := opentracing.SpanFromContext(ctx)
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if span == nil {
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return nil, nil
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}
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span = span.Tracer().StartSpan("post", opentracing.ChildOf(span.Context()))
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ext.SpanKindRPCClient.Set(span)
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c := opentracing.HTTPHeadersCarrier(req.Header)
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err := span.Tracer().Inject(span.Context(), opentracing.HTTPHeaders, c)
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return span, err
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}
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