1// Licensed to Elasticsearch B.V. under one or more contributor
2// license agreements. See the NOTICE file distributed with
3// this work for additional information regarding copyright
4// ownership. Elasticsearch B.V. licenses this file to you under
5// the Apache License, Version 2.0 (the "License"); you may
6// not use this file except in compliance with the License.
7// You may obtain a copy of the License at
8//
9//     http://www.apache.org/licenses/LICENSE-2.0
10//
11// Unless required by applicable law or agreed to in writing,
12// software distributed under the License is distributed on an
13// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
14// KIND, either express or implied.  See the License for the
15// specific language governing permissions and limitations
16// under the License.
17
18package transporttest
19
20import (
21	"context"
22	"io"
23	"io/ioutil"
24
25	"go.elastic.co/apm/transport"
26)
27
28// Discard is a transport.Transport which discards
29// all streams, and returns no errors.
30var Discard transport.Transport = ErrorTransport{}
31
32// ErrorTransport is a transport that returns the stored error
33// for each method call.
34type ErrorTransport struct {
35	Error error
36}
37
38// SendStream discards the stream and returns t.Error.
39func (t ErrorTransport) SendStream(ctx context.Context, r io.Reader) error {
40	errc := make(chan error, 1)
41	go func() {
42		_, err := io.Copy(ioutil.Discard, r)
43		errc <- err
44	}()
45	select {
46	case err := <-errc:
47		if err != nil {
48			return err
49		}
50		return t.Error
51	case <-ctx.Done():
52		return ctx.Err()
53	}
54}
55