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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 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) 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.buffer += 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)