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import asyncio
import errno
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.
previously_read = expecter.spawn.buffer
expecter.spawn.buffer = expecter.spawn.string_type()
idx = expecter.new_data(previously_read)
if idx is not None:
return idx
transport, pw = yield from asyncio.get_event_loop()\
.connect_read_pipe(lambda: PatternWaiter(expecter), expecter.spawn)
try:
return (yield from asyncio.wait_for(pw.fut, timeout))
except asyncio.TimeoutError as e:
transport.pause_reading()
return expecter.timeout(e)
class PatternWaiter(asyncio.Protocol):
def __init__(self, expecter):
self.expecter = expecter
self.fut = asyncio.Future()
def found(self, result):
if not self.fut.done():
self.fut.set_result(result)
def error(self, exc):
if not self.fut.done():
self.fut.set_exception(exc)
def data_received(self, data):
spawn = self.expecter.spawn
s = spawn._decoder.decode(data)
spawn._log(s, 'read')
if self.fut.done():
spawn.buffer += data
return
try:
index = self.expecter.new_data(data)
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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