| /* |
| * |
| * Copyright 2018 gRPC authors. |
| * |
| * 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 testutils contains testing helpers. |
| package testutils |
| |
| import ( |
| "errors" |
| "net" |
| "time" |
| ) |
| |
| var errClosed = errors.New("closed") |
| |
| type pipeAddr struct{} |
| |
| func (p pipeAddr) Network() string { return "pipe" } |
| func (p pipeAddr) String() string { return "pipe" } |
| |
| // PipeListener is a listener with an unbuffered pipe. Each write will complete only once the other side reads. It |
| // should only be created using NewPipeListener. |
| type PipeListener struct { |
| c chan chan<- net.Conn |
| done chan struct{} |
| } |
| |
| // NewPipeListener creates a new pipe listener. |
| func NewPipeListener() *PipeListener { |
| return &PipeListener{ |
| c: make(chan chan<- net.Conn), |
| done: make(chan struct{}), |
| } |
| } |
| |
| // Accept accepts a connection. |
| func (p *PipeListener) Accept() (net.Conn, error) { |
| var connChan chan<- net.Conn |
| select { |
| case <-p.done: |
| return nil, errClosed |
| case connChan = <-p.c: |
| select { |
| case <-p.done: |
| close(connChan) |
| return nil, errClosed |
| default: |
| } |
| } |
| c1, c2 := net.Pipe() |
| connChan <- c1 |
| close(connChan) |
| return c2, nil |
| } |
| |
| // Close closes the listener. |
| func (p *PipeListener) Close() error { |
| close(p.done) |
| return nil |
| } |
| |
| // Addr returns a pipe addr. |
| func (p *PipeListener) Addr() net.Addr { |
| return pipeAddr{} |
| } |
| |
| // Dialer dials a connection. |
| func (p *PipeListener) Dialer() func(string, time.Duration) (net.Conn, error) { |
| return func(string, time.Duration) (net.Conn, error) { |
| connChan := make(chan net.Conn) |
| select { |
| case p.c <- connChan: |
| case <-p.done: |
| return nil, errClosed |
| } |
| conn, ok := <-connChan |
| if !ok { |
| return nil, errClosed |
| } |
| return conn, nil |
| } |
| } |