68 lines
1.6 KiB
Go
68 lines
1.6 KiB
Go
package http
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import (
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"bytes"
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"context"
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"encoding/json"
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"fmt"
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"net/http"
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"net/url"
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"strings"
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opentracing "github.com/opentracing/opentracing-go"
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"github.com/opentracing/opentracing-go/ext"
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)
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// PostJSON performs a POST request with JSON on an internal HTTP API
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func PostJSON(
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ctx context.Context, span opentracing.Span, httpClient *http.Client,
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apiURL string, request, response interface{},
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) error {
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jsonBytes, err := json.Marshal(request)
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if err != nil {
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return err
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}
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parsedAPIURL, err := url.Parse(apiURL)
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if err != nil {
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return err
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}
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parsedAPIURL.Path = "/api/" + strings.TrimLeft(parsedAPIURL.Path, "/")
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apiURL = parsedAPIURL.String()
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req, err := http.NewRequest(http.MethodPost, apiURL, bytes.NewReader(jsonBytes))
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if err != nil {
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return err
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}
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// Mark the span as being an RPC client.
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ext.SpanKindRPCClient.Set(span)
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carrier := opentracing.HTTPHeadersCarrier(req.Header)
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tracer := opentracing.GlobalTracer()
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if err = tracer.Inject(span.Context(), opentracing.HTTPHeaders, carrier); err != nil {
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return err
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}
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req.Header.Set("Content-Type", "application/json")
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res, err := httpClient.Do(req.WithContext(ctx))
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if res != nil {
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defer (func() { err = res.Body.Close() })()
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}
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if err != nil {
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return err
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}
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if res.StatusCode != http.StatusOK {
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var errorBody struct {
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Message string `json:"message"`
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}
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if msgerr := json.NewDecoder(res.Body).Decode(&errorBody); msgerr == nil {
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return fmt.Errorf("api: %d from %s: %s", res.StatusCode, apiURL, errorBody.Message)
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}
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return fmt.Errorf("api: %d from %s", res.StatusCode, apiURL)
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}
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return json.NewDecoder(res.Body).Decode(response)
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}
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