class WriteFileHandler(web.RequestHandler): @web.asynchronous def get(self): print 'handler begin at %s' % datetime.now() self.f = open('test.data', 'w') self.stream = PipeIOStream(self.f.fileno()) self.stream.write(test_data, self.callback) print 'handler async write at %s' % datetime.now() def callback(self): self.f.close() self.finish() print 'handler complete at %s' % datetime.now()
def test_pipe_iostream_big_write(self): r, w = os.pipe() rs = PipeIOStream(r, io_loop=self.io_loop) ws = PipeIOStream(w, io_loop=self.io_loop) NUM_BYTES = 1048576 # Write 1MB of data, which should fill the buffer ws.write(b"1" * NUM_BYTES) rs.read_bytes(NUM_BYTES, self.stop) data = self.wait() self.assertEqual(data, b"1" * NUM_BYTES) ws.close() rs.close()
def test_pipe_iostream_big_write(self): r, w = os.pipe() rs = PipeIOStream(r, io_loop=self.io_loop) ws = PipeIOStream(w, io_loop=self.io_loop) NUM_BYTES = 1048576 # Write 1MB of data, which should fill the buffer ws.write(b"1" * NUM_BYTES) rs.read_bytes(NUM_BYTES, self.stop) data = self.wait() self.assertEqual(data, b"1" * NUM_BYTES) ws.close() rs.close()
class Shell(object): def __init__(self, stdin=sys.stdin, stdout=sys.stdout, context: dict={}): """ Create a new shell. :param stdin: file handle of the stdandard input :param stdout: file handle of the standard output :param context: exposed variables """ self.stdin = PipeIOStream(stdin.fileno()) self.stdout = PipeIOStream(stdout.fileno()) self.input_buffer = [] self.running = False self.context = context def start(self): self.running = True self.stdout.write(b"\r$>") self.stdin.read_until(b'\n', self.on_line) def on_line(self, chunk_bytes: bytes): chunk = chunk_bytes.decode('utf-8', errors='ignore').rstrip('\n') if not chunk.endswith('\\'): self.input_buffer.append(chunk.strip()) line = " ".join(self.input_buffer) self.input_buffer.clear() self.on_command(line) else: self.input_buffer.append(chunk[:-1].strip()) self.stdout.write(b"\r ") if self.running: self.start() @tornado.gen.engine def on_command(self, command): try: if command: code = compile(command + '\n', '<shell>', 'single') res = eval(code, self.context) if res is not None: r = pprint.pformat(res).encode('utf-8') yield tornado.gen.Task(self.stdout.write, r + b'\n') except SystemExit: raise except: yield tornado.gen.Task(self.stdout.write, traceback.format_exc().encode('utf-8'))
def test_pipe_iostream(self): r, w = os.pipe() rs = PipeIOStream(r, io_loop=self.io_loop) ws = PipeIOStream(w, io_loop=self.io_loop) ws.write(b"hel") ws.write(b"lo world") rs.read_until(b' ', callback=self.stop) data = self.wait() self.assertEqual(data, b"hello ") rs.read_bytes(3, self.stop) data = self.wait() self.assertEqual(data, b"wor") ws.close() rs.read_until_close(self.stop) data = self.wait() self.assertEqual(data, b"ld") rs.close()
def test_pipe_iostream(self): r, w = os.pipe() rs = PipeIOStream(r, io_loop=self.io_loop) ws = PipeIOStream(w, io_loop=self.io_loop) ws.write(b"hel") ws.write(b"lo world") rs.read_until(b" ", callback=self.stop) data = self.wait() self.assertEqual(data, b"hello ") rs.read_bytes(3, self.stop) data = self.wait() self.assertEqual(data, b"wor") ws.close() rs.read_until_close(self.stop) data = self.wait() self.assertEqual(data, b"ld") rs.close()
class PipeStream(Stream): def __init__(self, rpipe, wpipe=None, auto_close=False): """Pipe-based stream NOTE: reading from or writing to files, use os.open to get the file descriptor instead of python's open. Socket file descriptors and others are fine. when you use os.pipe to generate one write pipe and one read pipe, you need to pass both of them into init method. :param rpipe: an integer file descriptor which supports read ops :param wpipe: an integer file descriptor which supports write ops :param auto: flag to indicate to close the stream automatically or not """ assert rpipe is not None self._rpipe = rpipe self._wpipe = wpipe self._rs = PipeIOStream(self._rpipe) if self._rpipe is not None else None self._ws = PipeIOStream(self._wpipe) if self._wpipe is not None else None self.auto_close = auto_close self.state = StreamState.init self.exception = None @tornado.gen.coroutine def read(self): if self.exception: raise self.exception if self.state == StreamState.completed or self._rpipe is None: raise tornado.gen.Return("") elif self.state == StreamState.init: self.state = StreamState.streaming chunk = "" try: chunk = yield self._rs.read_bytes(common.MAX_PAYLOAD_SIZE, partial=True) except StreamClosedError: # reach the end of the pipe stream self.state = StreamState.completed finally: if self.exception: raise self.exception raise tornado.gen.Return(chunk) @tornado.gen.coroutine def write(self, chunk): assert self._wpipe is not None if self.exception: raise self.exception try: yield self._ws.write(chunk) self.state = StreamState.streaming except StreamClosedError: self.state = StreamState.completed raise UnexpectedError("Stream has been closed.") finally: if self.exception: raise self.exception def set_exception(self, exception): self.exception = exception self.close() def close(self): self.state = StreamState.completed if self._ws and self.auto_close: self._ws.close() if self._rs and self.auto_close: self._rs.close()