| // Copyright 2022 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| package device |
| |
| import ( |
| "bufio" |
| "fmt" |
| "net" |
| "sync" |
| ) |
| |
| type SerialConn struct { |
| serial net.Conn |
| mu sync.Mutex |
| bufReader *bufio.Reader |
| } |
| |
| // Create the new serial connection. |
| func NewSerialConn(serialSocketPath string) (*SerialConn, error) { |
| if serialSocketPath == "" { |
| return nil, fmt.Errorf("serialSocketPath not set") |
| } |
| |
| serial, err := net.Dial("unix", serialSocketPath) |
| |
| if err != nil { |
| return nil, fmt.Errorf("failed to open serial socket connection: %w", err) |
| } |
| |
| bufReader := bufio.NewReader(serial) |
| |
| s := &SerialConn{ |
| serial: serial, |
| bufReader: bufReader, |
| } |
| |
| return s, nil |
| } |
| |
| // Write a line into the serial connection. |
| func (s *SerialConn) WriteLine(cmd []byte) error { |
| s.mu.Lock() |
| defer s.mu.Unlock() |
| _, err := s.serial.Write(cmd) |
| return err |
| } |
| |
| // Read a line from the serial connection. |
| func (s *SerialConn) ReadLine() (string, error) { |
| s.mu.Lock() |
| defer s.mu.Unlock() |
| bytes, err := s.bufReader.ReadBytes('\n') |
| return string(bytes), err |
| } |