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119 lines
3.7 KiB
Python
119 lines
3.7 KiB
Python
"""Implementation of coroutines using ``async def``/``await`` keywords.
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These keywords replaced ``@asyncio.coroutine`` and ``yield from`` from
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Python 3.5 onwards.
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"""
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import asyncio
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import errno
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import signal
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from sys import version_info as py_version_info
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from pexpect import EOF
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if py_version_info >= (3, 7):
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# get_running_loop, new in 3.7, is preferred to get_event_loop
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_loop_getter = asyncio.get_running_loop
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else:
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# Deprecation warning since 3.10
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_loop_getter = asyncio.get_event_loop
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async def expect_async(expecter, timeout=None):
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# First process data that was previously read - if it maches, we don't need
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# async stuff.
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idx = expecter.existing_data()
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if idx is not None:
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return idx
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if not expecter.spawn.async_pw_transport:
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pattern_waiter = PatternWaiter()
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pattern_waiter.set_expecter(expecter)
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transport, pattern_waiter = await _loop_getter().connect_read_pipe(
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lambda: pattern_waiter, expecter.spawn
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)
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expecter.spawn.async_pw_transport = pattern_waiter, transport
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else:
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pattern_waiter, transport = expecter.spawn.async_pw_transport
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pattern_waiter.set_expecter(expecter)
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transport.resume_reading()
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try:
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return await asyncio.wait_for(pattern_waiter.fut, timeout)
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except asyncio.TimeoutError as exc:
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transport.pause_reading()
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return expecter.timeout(exc)
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async def repl_run_command_async(repl, cmdlines, timeout=-1):
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res = []
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repl.child.sendline(cmdlines[0])
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for line in cmdlines[1:]:
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await repl._expect_prompt(timeout=timeout, async_=True)
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res.append(repl.child.before)
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repl.child.sendline(line)
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# Command was fully submitted, now wait for the next prompt
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prompt_idx = await repl._expect_prompt(timeout=timeout, async_=True)
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if prompt_idx == 1:
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# We got the continuation prompt - command was incomplete
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repl.child.kill(signal.SIGINT)
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await repl._expect_prompt(timeout=1, async_=True)
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raise ValueError("Continuation prompt found - input was incomplete:")
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return "".join(res + [repl.child.before])
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class PatternWaiter(asyncio.Protocol):
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transport = None
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def set_expecter(self, expecter):
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self.expecter = expecter
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self.fut = asyncio.Future()
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def found(self, result):
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if not self.fut.done():
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self.fut.set_result(result)
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self.transport.pause_reading()
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def error(self, exc):
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if not self.fut.done():
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self.fut.set_exception(exc)
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self.transport.pause_reading()
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def connection_made(self, transport):
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self.transport = transport
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def data_received(self, data):
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spawn = self.expecter.spawn
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s = spawn._decoder.decode(data)
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spawn._log(s, "read")
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if self.fut.done():
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spawn._before.write(s)
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spawn._buffer.write(s)
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return
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try:
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index = self.expecter.new_data(s)
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if index is not None:
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# Found a match
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self.found(index)
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except Exception as exc:
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self.expecter.errored()
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self.error(exc)
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def eof_received(self):
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# N.B. If this gets called, async will close the pipe (the spawn object)
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# for us
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try:
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self.expecter.spawn.flag_eof = True
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index = self.expecter.eof()
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except EOF as exc:
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self.error(exc)
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else:
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self.found(index)
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def connection_lost(self, exc):
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if isinstance(exc, OSError) and exc.errno == errno.EIO:
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# We may get here without eof_received being called, e.g on Linux
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self.eof_received()
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elif exc is not None:
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self.error(exc)
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