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http.go
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http.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package tracing
import (
"context"
"encoding/json"
"errors"
"io/ioutil"
"net/http"
"github.com/opentracing-contrib/go-stdlib/nethttp"
"github.com/opentracing/opentracing-go"
)
// HTTPClient wraps an http.Client with tracing instrumentation.
type HTTPClient struct {
Tracer opentracing.Tracer
Client *http.Client
}
// GetJSON executes HTTP GET against specified url and tried to parse
// the response into out object.
func (c *HTTPClient) GetJSON(ctx context.Context, endpoint string, url string, out interface{}) error {
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return err
}
req = req.WithContext(ctx)
req, ht := nethttp.TraceRequest(c.Tracer, req, nethttp.OperationName("HTTP GET: "+endpoint))
defer ht.Finish()
res, err := c.Client.Do(req)
if err != nil {
return err
}
defer res.Body.Close()
if res.StatusCode >= 400 {
body, err := ioutil.ReadAll(res.Body)
if err != nil {
return err
}
return errors.New(string(body))
}
decoder := json.NewDecoder(res.Body)
return decoder.Decode(out)
}