Current File : //usr/lib/python3/dist-packages/pexpect/_async_pre_await.py
"""Implementation of coroutines without using ``async def``/``await`` keywords.
``@asyncio.coroutine`` and ``yield from`` are used here instead.
"""
import asyncio
import errno
import signal
from pexpect import EOF
@asyncio.coroutine
def expect_async(expecter, timeout=None):
# First process data that was previously read - if it maches, we don't need
# async stuff.
idx = expecter.existing_data()
if idx is not None:
return idx
if not expecter.spawn.async_pw_transport:
pw = PatternWaiter()
pw.set_expecter(expecter)
transport, pw = yield from asyncio.get_event_loop().connect_read_pipe(
lambda: pw, expecter.spawn
)
expecter.spawn.async_pw_transport = pw, transport
else:
pw, transport = expecter.spawn.async_pw_transport
pw.set_expecter(expecter)
transport.resume_reading()
try:
return (yield from asyncio.wait_for(pw.fut, timeout))
except asyncio.TimeoutError as e:
transport.pause_reading()
return expecter.timeout(e)
@asyncio.coroutine
def repl_run_command_async(repl, cmdlines, timeout=-1):
res = []
repl.child.sendline(cmdlines[0])
for line in cmdlines[1:]:
yield from repl._expect_prompt(timeout=timeout, async_=True)
res.append(repl.child.before)
repl.child.sendline(line)
# Command was fully submitted, now wait for the next prompt
prompt_idx = yield from repl._expect_prompt(timeout=timeout, async_=True)
if prompt_idx == 1:
# We got the continuation prompt - command was incomplete
repl.child.kill(signal.SIGINT)
yield from repl._expect_prompt(timeout=1, async_=True)
raise ValueError("Continuation prompt found - input was incomplete:")
return "".join(res + [repl.child.before])
class PatternWaiter(asyncio.Protocol):
transport = None
def set_expecter(self, expecter):
self.expecter = expecter
self.fut = asyncio.Future()
def found(self, result):
if not self.fut.done():
self.fut.set_result(result)
self.transport.pause_reading()
def error(self, exc):
if not self.fut.done():
self.fut.set_exception(exc)
self.transport.pause_reading()
def connection_made(self, transport):
self.transport = transport
def data_received(self, data):
spawn = self.expecter.spawn
s = spawn._decoder.decode(data)
spawn._log(s, "read")
if self.fut.done():
spawn._before.write(s)
spawn._buffer.write(s)
return
try:
index = self.expecter.new_data(s)
if index is not None:
# Found a match
self.found(index)
except Exception as e:
self.expecter.errored()
self.error(e)
def eof_received(self):
# N.B. If this gets called, async will close the pipe (the spawn object)
# for us
try:
self.expecter.spawn.flag_eof = True
index = self.expecter.eof()
except EOF as e:
self.error(e)
else:
self.found(index)
def connection_lost(self, exc):
if isinstance(exc, OSError) and exc.errno == errno.EIO:
# We may get here without eof_received being called, e.g on Linux
self.eof_received()
elif exc is not None:
self.error(exc)
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