github.com/waldiirawan/apm-agent-go/v2@v2.2.2/transport/transporttest/err.go (about)

     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  
    18  package transporttest // import "github.com/waldiirawan/apm-agent-go/v2/transport/transporttest"
    19  
    20  import (
    21  	"context"
    22  	"io"
    23  	"io/ioutil"
    24  
    25  	"github.com/waldiirawan/apm-agent-go/v2/transport"
    26  )
    27  
    28  // Discard is a transport.Transport which discards
    29  // all streams, and returns no errors.
    30  var Discard transport.Transport = ErrorTransport{}
    31  
    32  // ErrorTransport is a transport that returns the stored error
    33  // for each method call.
    34  type ErrorTransport struct {
    35  	Error error
    36  }
    37  
    38  // SendStream discards the stream and returns t.Error.
    39  func (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  }