7c9314f231
* swarm: propagate ctx, enable opentracing * swarm/tracing: log error when tracing is misconfigured
55 lines
1.4 KiB
Go
55 lines
1.4 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 utils
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import (
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"encoding/json"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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)
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// GetJSON makes an HTTP call to the specified URL and parses the returned JSON into `out`.
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func GetJSON(url string, out interface{}) error {
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resp, err := http.Get(url)
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if err != nil {
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return err
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}
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return ReadJSON(resp, out)
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}
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// ReadJSON reads JSON from http.Response and parses it into `out`
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func ReadJSON(resp *http.Response, out interface{}) error {
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defer resp.Body.Close()
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if resp.StatusCode >= 400 {
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return err
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}
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return fmt.Errorf("StatusCode: %d, Body: %s", resp.StatusCode, body)
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}
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if out == nil {
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io.Copy(ioutil.Discard, resp.Body)
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return nil
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}
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decoder := json.NewDecoder(resp.Body)
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return decoder.Decode(out)
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}
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