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