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77 lines
3.0 KiB
Python
77 lines
3.0 KiB
Python
# SPDX-FileCopyrightText: 2015-2022 Espressif Systems (Shanghai) CO LTD
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# SPDX-License-Identifier: Apache-2.0
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import os
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import queue
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import time
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from serial.tools.miniterm import Console
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from .console_parser import ConsoleParser
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from .constants import CMD_STOP, TAG_CMD
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from .stoppable_thread import StoppableThread
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class ConsoleReader(StoppableThread):
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""" Read input keys from the console and push them to the queue,
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until stopped.
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"""
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def __init__(self, console, event_queue, cmd_queue, parser, test_mode):
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# type: (Console, queue.Queue, queue.Queue, ConsoleParser, bool) -> None
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super(ConsoleReader, self).__init__()
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self.console = console
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self.event_queue = event_queue
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self.cmd_queue = cmd_queue
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self.parser = parser
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self.test_mode = test_mode
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def run(self):
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# type: () -> None
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self.console.setup()
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if os.name == 'posix':
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# Use non-blocking busy read to avoid using unsecure TIOCSTI from console.cancel().
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# TIOCSTI is not supported on kernels newer than 6.2.
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import termios
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new = termios.tcgetattr(self.console.fd)
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# new[6] - 'cc': a list of the tty special characters
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new[6][termios.VMIN] = 0 # minimum bytes to read
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new[6][termios.VTIME] = 2 # timer of 0.1 second granularity
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termios.tcsetattr(self.console.fd, termios.TCSANOW, new)
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try:
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while self.alive:
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try:
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if os.name == 'nt':
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# Windows kludge: because the console.cancel() method doesn't
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# seem to work to unblock getkey() on the Windows implementation.
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#
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# So we only call getkey() if we know there's a key waiting for us.
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import msvcrt
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while not msvcrt.kbhit() and self.alive: # type: ignore
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time.sleep(0.1)
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if not self.alive:
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break
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elif self.test_mode:
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# In testing mode the stdin is connected to PTY but is not used for input anything. For PTY
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# the canceling by fcntl.ioctl isn't working and would hang in self.console.getkey().
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# Therefore, we avoid calling it.
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while self.alive:
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time.sleep(0.1)
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break
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c = self.console.getkey()
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except KeyboardInterrupt:
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c = '\x03'
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if c:
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ret = self.parser.parse(c)
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if ret is not None:
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(tag, cmd) = ret
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# stop command should be executed last
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if tag == TAG_CMD and cmd != CMD_STOP:
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self.cmd_queue.put(ret)
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else:
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self.event_queue.put(ret)
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finally:
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self.console.cleanup()
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