77e69b9cf3
Signed-off-by: Olivier Gambier <olivier@docker.com>
80 lines
1.8 KiB
Go
80 lines
1.8 KiB
Go
// Copyright 2015 Google Inc. All Rights Reserved.
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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 transport
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import (
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"bytes"
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"io/ioutil"
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"net/http"
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"github.com/golang/protobuf/proto"
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"golang.org/x/net/context"
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)
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type ProtoClient struct {
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client *http.Client
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endpoint string
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userAgent string
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}
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func (c *ProtoClient) Call(ctx context.Context, method string, req, resp proto.Message) error {
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payload, err := proto.Marshal(req)
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if err != nil {
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return err
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}
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httpReq, err := http.NewRequest("POST", c.endpoint+method, bytes.NewReader(payload))
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if err != nil {
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return err
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}
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httpReq.Header.Set("Content-Type", "application/x-protobuf")
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if ua := c.userAgent; ua != "" {
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httpReq.Header.Set("User-Agent", ua)
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}
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errc := make(chan error, 1)
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cancel := makeReqCancel(httpReq)
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go func() {
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r, err := c.client.Do(httpReq)
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if err != nil {
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errc <- err
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return
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}
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defer r.Body.Close()
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body, err := ioutil.ReadAll(r.Body)
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if r.StatusCode != http.StatusOK {
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err = &ErrHTTP{
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StatusCode: r.StatusCode,
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Body: body,
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err: err,
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}
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}
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if err != nil {
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errc <- err
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return
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}
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errc <- proto.Unmarshal(body, resp)
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}()
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select {
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case <-ctx.Done():
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cancel(c.client.Transport) // Cancel the HTTP request.
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return ctx.Err()
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case err := <-errc:
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return err
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}
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}
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