Python DefaultSelector.select方法代码示例

# 需要导入模块: from selectors import DefaultSelector [as 别名]
# 或者: from selectors.DefaultSelector import select [as 别名]
 def selector():
     sel = DefaultSelector()
     sel.register(proc.stdout, EVENT_READ, 0)
     sel.register(proc.stderr, EVENT_READ, 1)
     while True:
         for key, mask in sel.select():
             yield key.data, decode(key.fileobj.readline(linesize))

# 需要导入模块: from selectors import DefaultSelector [as 别名]
# 或者: from selectors.DefaultSelector import select [as 别名]
class Loop:
    def __init__(self):
        self.sel = DefaultSelector()
        self.queue = deque()

    def create_task(self, coro):
        sock = coro.send(None)
        self.sel.register(sock, EVENT_WRITE, coro)
        self.queue.append(coro)

    def run(self):
        while self.queue:
            events = self.sel.select()
            for key, _ in events:
                coro = key.data
                event = key.events
                file_obj = key.fileobj
                self.sel.unregister(file_obj)
                try:
                    if event == EVENT_WRITE:
                        self.sel.register(file_obj, EVENT_READ, coro)
                    elif event == EVENT_READ:
                        self.sel.register(file_obj, EVENT_WRITE, coro)
                    coro.send(None)
                except StopIteration:
                    self.queue.popleft()
                except:
                    pass
        else: return

# 需要导入模块: from selectors import DefaultSelector [as 别名]
# 或者: from selectors.DefaultSelector import select [as 别名]
class Loop:
    def __init__(self):
        self.ready = deque()
        self.selector = DefaultSelector()
        self.futures = {}
    def create_task(self, task):
        self.ready.append(task)
    def run_forever(self):
        while True:

            while not self.ready:
                completed_futures = [future for future in self.futures if not future.running()]
                for future in completed_futures:
                    self.ready.append(self.futures.pop(future))

                # so select() is blocking. If set a negative time out it won't block.
                events = self.selector.select(-1)
                # add these socket events and unregister them from listened to:
                for key, _ in events:
                    self.ready.append(key.data) # add the task to the ready queue
                    self.selector.unregister(key.fileobj)

            while self.ready:
                self.current_task = self.ready.popleft()
                # try to run current_task...
                try:
                    # run task to next yield point
                    reason, what = self.current_task.send(None)
                    # reason, what = self.current_task.send(None)
                    if reason == 'waiting_to_accept':
                        self.selector.register(what, EVENT_READ, self.current_task)
                    elif reason == 'waiting_to_read':
                        self.selector.register(what, EVENT_READ, self.current_task)
                    elif reason == 'waiting_to_write':
                        self.selector.register(what, EVENT_WRITE, self.current_task)
                    elif reason == 'waiting_for_future':
                        self.futures[what] = self.current_task
                    else:
                        raise RuntimeError(
                            'Something bad happened... er. reason={}'.format(reason))
                except StopIteration:
                    pass

    async def sock_recv(self, sock, maxbytes):
        # wait to read from the socket
        await read_wait(sock)
        return sock.recv(maxbytes)
    async def sock_accept(self, sock):
        # wait to read/hear from the socket
        await accept_wait(sock)
        return sock.accept()
    async def sock_sendall(self, sock, data):
        while data:
            # wait to be able to write to the socket
            await write_wait(sock)
            nsent = sock.send(data)
            data = data[nsent:]

    def run_in_executor(self, executor, func, *args):
        return executor.submit(func, *args)

# 需要导入模块: from selectors import DefaultSelector [as 别名]
# 或者: from selectors.DefaultSelector import select [as 别名]
 def selector():
     sel = DefaultSelector()
     sel.register(proc.stdout, EVENT_READ, 0)
     sel.register(proc.stderr, EVENT_READ, 1)
     while True:
         ready = sel.select(line_timeout)
         if not ready and line_timeout:
             raise ProcessLineTimedOut("popen line timeout expired", getattr(proc, "argv", None), getattr(proc, "machine", None))
         for key, mask in ready:
             yield key.data, decode(key.fileobj.readline(linesize))

# 需要导入模块: from selectors import DefaultSelector [as 别名]
# 或者: from selectors.DefaultSelector import select [as 别名]
class IRC(Service):
	DEFAULT_PORT = 6667
	TIMEOUT = 3
	def __init__(self,events):
		super().__init__(events,'irc')
		self.servers = set()
		self.selector = DefaultSelector()
		self.events = events
		self.has_servers = Event()
		self.channels = {}#server:[channels]
	def respond(self,addr,command):
		if command['action']=='connect':
			server = command['host']
			nick = command['nick']
			port = command.get('port',self.DEFAULT_PORT)
			self.connect((server,port),nick)
		if command['action']=='status':
			print(self.servers)
			self.broadcast({
				'kind':'status',
				'status':{
					'servers':{
						s: {
							'channels':v
						} for s,v in self.channels.items()
					}
				}
			})
	def connect(self,addr,nick):
		host = addr[0]
		if host not in self.servers:
			print(nick)
			sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
			print(addr)
			sock.connect(addr)
			self.events.listen(host,self.check_channels)
			self.selector.register(sock,EVENT_READ|EVENT_WRITE,ChatServerInterface(addr[0],nick,self.events))
			self.servers.add(host)
			self.channels[host] = list()
			if not self.has_servers.is_set():
				self.has_servers.set()
	def check_channels(self,addr,event):
		if event['kind']=='irc':
			if event['command']=='332':
				print(event['event'],event['arguments'])
				self.channels[event['event']].append(event['arguments'][1].lower())
	def loop(self):
		while True:
			self.has_servers.wait()
			for key,mask in self.selector.select():
				if mask&EVENT_READ==EVENT_READ:
					key.data.read_data(key.fileobj)
				if mask&EVENT_WRITE==EVENT_WRITE:
					key.data.write_data(key.fileobj)

# 需要导入模块: from selectors import DefaultSelector [as 别名]
# 或者: from selectors.DefaultSelector import select [as 别名]
 def loop():
     pre_loop_barrier.wait(1)
     selector = DefaultSelector()
     selector.register(sig_r_fd, EVENT_READ)
     with suppress(StopIteration):
         while True:
             events = selector.select(timeout=5)
             if len(events) == 0:
                 raise StopIteration
             for key, mask in events:
                 if key.fd == sig_r_fd:
                     data = os.read(sig_r_fd, 4)
                     self._sigchld_caught = True
                     raise StopIteration
     self._post_loop_barrier.wait(1)

# 需要导入模块: from selectors import DefaultSelector [as 别名]
# 或者: from selectors.DefaultSelector import select [as 别名]
class Loop:
    def __init__(self):
        self.ready = deque()
        self.selector = DefaultSelector()

    async def sock_recv(self, sock, maxbytes):
        await read_wait(sock)
        return sock.recv(maxbytes)

    async def sock_accept(self, sock):
        await read_wait(sock)
        return sock.accept()

    async def sock_sendall(self, sock, data):
        while data:
            try:
                nsent = sock.send(data)
                data = data[nsent:]
            except BlockingIOError:
                await write_wait(sock)

    def create_task(self, coro):
        self.ready.append(coro)

    def run_forever(self):
        while True:
            while not self.ready:
                events = self.selector.select()
                for key, _ in events:
                    self.ready.append(key.data)
                    self.selector.unregister(key.fileobj)

            while self.ready:
                self.current_task = self.ready.popleft()
                try:
                    op, *args = self.current_task.send(None)
                    getattr(self, op)(*args)
                except StopIteration:
                    pass
                
    def read_wait(self, sock):
        self.selector.register(sock, EVENT_READ, self.current_task)

    def write_wait(self, sock):
        self.selector.register(sock, EVENT_WRITE, self.current_task)

# 需要导入模块: from selectors import DefaultSelector [as 别名]
# 或者: from selectors.DefaultSelector import select [as 别名]
class Loop:
    def __init__(self):
        self.ready = deque()
        self.selector = DefaultSelector()
    def create_task(self, task):
        self.ready.append(task)
    def run_forever(self):
        while True:
            # hmmn, nothing to run -> must be waiting on stuff...
            while not self.ready:
                events = self.selector.select()
                # add these events and unregister them from listened to:
                for key, _ in events:
                    self.ready.append(key.data)
                    self.selector.unregister(key.fileobj)
            while self.ready:
                self.current_task = self.ready.popleft()
                # try to run current_task...
                try:
                    # run task to next yield point
                    reason, sock = next(self.current_task)
                    if reason == 'waiting_to_accept':
                        self.selector.register(sock, EVENT_READ, self.current_task)
                    elif reason == 'waiting_to_read':
                        self.selector.register(sock, EVENT_READ, self.current_task)
                    elif reason == 'waiting_to_write':
                        self.selector.register(sock, EVENT_WRITE, self.current_task)
                    else:
                        raise RuntimeError('Something bad happened... er. reason={}'.format(reason))
                except StopIteration:
                    pass

    def sock_recv(self, sock, maxbytes):
        # wait to read from the socket
        return sock.recv(maxbytes)
    def sock_accept(self, sock):
        # wait to read/hear from the socket
        return sock.accept()
    def sock_sendall(self, sock, data):
        while data:
            # wait to be able to write to the socket
            nsent = sock.send(data)
            data = data[nsent:]

# 需要导入模块: from selectors import DefaultSelector [as 别名]
# 或者: from selectors.DefaultSelector import select [as 别名]
class Loop:
    def __init__(self):
        self.ready = deque()
        self.selectors = DefaultSelector() # a way to watch socket IO
    async def sock_recv(self, sock, maxbytes):
        await read_wait(sock) # wait for something happen
        return sock.recv(maxbytes)
    async def sock_accept(self, sock):
        await read_wait(sock)
        return sock.sock_accept()
    async def sock_sendall(self, sock, data):
        while data :
            try:
                nsent = sock.send(data)
                data = data[nsent:] # send partial data
            except BlockingIOError:
                await write_wait(sock)
    def create_task(self, coro):
        self.ready.append(coro)
    def run_forever(self):
        while True:
            while not self.ready:
                events = self.selectors.select()
                for key, _  in events:
                    self.ready.append(key.data)
                    self.selectors.unregister(key.fileobj)
        while self.ready:
            self.current_task = self.ready.popleft()
            try:
                op, *args = self.current_task.send(None) # run to the yield

                getattr(self,op)(*args) # Sneaky method call

            except StopIteration:
                pass
    def read_wait(self, sock):
        self.selectors.register(sock, EVENT_READ, self.current_task)
    def write_wait(self, sock):
        self.selectors.register

# 需要导入模块: from selectors import DefaultSelector [as 别名]
# 或者: from selectors.DefaultSelector import select [as 别名]
class TCPServer:

    def __init__(self, port):
        self.port = port
        self.sock = None
        self.selector = DefaultSelector()

        # Advance self.listen() method. A future has been attached to the
        # server socket, that has been registered in selector. And a callback
        # has been attached to this future.
        Task(self.listen())

    def run(self):
        while True:
            ready = self.selector.select()
            for key, events in ready:
                fut = key.data
                fut.resolve()

    def listen(self):
        server_sock = self._create_socket()
        with server_sock:
            try:
                client_sock, remote_addr = self.sock.accept()
            except BlockingIOError:
                pass

            fut = Future()
            self.selector.register(self.sock, EVENT_READ, fut)
            while True:
                yield fut
                Task(self.handle_client())

    def handle_client(self):
        client_sock, remote_addr = self.sock.accept()
        client_sock.setblocking(False)
        client_name = '{} {}'.format(*client_sock.getpeername())
        print('Connected', client_name)

        # Register client socket for reading and wait for this event
        fut = Future()
        self.selector.register(client_sock, EVENT_READ, fut)
        yield fut

        buffer = []
        while True:
            try:
                chunk = client_sock.recv(1024)
                buffer.append(chunk)
            except BlockingIOError:
                # Yield the same future, so we don't need to register
                # it again. By the way, callback is the same for all
                # futures, so it doesn't matter in my case.
                yield fut
                continue

            print('Received chunk from client', client_name)
            if chunk.endswith(b'end'):
                print('Got all data from client', client_name)
                request = b''.join(buffer).decode('utf8')
                response = (request.upper() * 100).encode('utf8')
                self.selector.unregister(client_sock)
                fut = Future()
                self.selector.register(client_sock, EVENT_WRITE, fut)
                break

        # This future was attached to the client_sock
        yield fut
        while True:
            try:
                bytes_sent = client_sock.send(response)
                print(bytes_sent, 'bytes sent to client', client_name)
                response = response[bytes_sent:]
            except BlockingIOError:
                print('Socket blockes for', client_name)
                yield fut
                continue
            else:
                if not response:
                    # All response sent
                    print('Response sent to client', client_name)
                    self.selector.unregister(client_sock)
                    client_sock.close()
                    break

    def _create_socket(self):
        self.sock = socket.socket()
        self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_SNDBUF, 10)
        self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        self.sock.bind(('', self.port))
        self.sock.setblocking(False)
        self.sock.listen(10)
        self.responses = {}
        return self.sock

# 需要导入模块: from selectors import DefaultSelector [as 别名]
# 或者: from selectors.DefaultSelector import select [as 别名]
 def selector():
     sel = DefaultSelector()
     sel.register(proc.stdout.channel, EVENT_READ)
     while True:
         for key, mask in sel.select():
             yield

# 需要导入模块: from selectors import DefaultSelector [as 别名]
# 或者: from selectors.DefaultSelector import select [as 别名]
class Loop:
    """
    Событийный цикл, который использует очередь сдвухсторонним доступом
    Цикл опрашивает селектор на предмет готовности событий для чтения и записи
    в сокет
    """
    def __init__(self):
        """
        Конструктор событийного цикла, который хранит очередь
        :return:
        """
        self.ready = deque()
        self.selector = DefaultSelector()

    async def sock_recv(self, sock, max_bytes):
        """
        курутина для чтения данных из сокета в асинхронный способ
        :param sock: дескриптор сокета
        :param max_bytes: максимальное количество байт, который могут быть
        прочитаны за один раз без блокировки
        :return: принятые из сокета данные в банарном виде
        """
        await read_wait(sock)
        return sock.recv(max_bytes)

    async def sock_accept(self, sock):
        await read_wait(sock)
        return sock.accept()

    async def sock_sendall(self, sock, data):
        while data:
            try:
                n_sent = sock.send(data)
                data = data[n_sent:]
            except BlockingIOError:
                await write_wait(sock)

    def create_task(self, coro):
        self.ready.append(coro)

    def run_forever(self):
        while True:
            while not self.ready:
                events = self.selector.select()
                for key, _ in events:
                    self.ready.append(key.data)
                    self.selector.unregister(key.fileobj)

            while self.ready:
                self.current_task = self.ready.popleft()
                try:
                    # запускаем генератор до появления yield
                    op, *args = self.current_task.send(None)
                    getattr(self, op)(*args)
                except StopIteration:
                    pass

    def read_wait(self, sock):
        self.selector.register(sock, EVENT_READ, self.current_task)

    def write_wait(self, sock):
        self.selector.register(sock, EVENT_WRITE, self.current_task)

# 需要导入模块: from selectors import DefaultSelector [as 别名]
# 或者: from selectors.DefaultSelector import select [as 别名]
class SimpleServer(object):
    """ This is a simple server receiving and sending utf-8 plain text lines
        over TCP/IP. It should use epoll or other efficient mechanisms if
        available to support a large number of clients without cpu hogging.

        All data sent to connections will be utf-8 encoded. All received lines
        from clients are expected to be utf-8 encoded.

        Lines longer than 10KB will be quietly dropped.
    """
    def __init__(self, port, callback):
        logging.basicConfig(level=logging.INFO)
        self.clients_kept_for_sending = []
        self.selector = DefaultSelector()
        self.callback = callback
        self.server_socket = socket.socket(family=socket.AF_INET6,
            type=socket.SOCK_STREAM)
        self.server_socket.bind(("::0", port))
        self.server_socket.listen(5)
        self.selector.register(self.server_socket, EVENT_READ, data=None)
        self.server_socket.setblocking(False)

    def close(self):
        self.server_socket.close()

    def _remove_socket(self, socket):
        try:
            self.selector.unregister(socket)
        except KeyError:
            pass

    def _handle_new_client(self, socket, addr):
        client = SimpleClient(socket, self, addr)
        self.selector.register(socket, EVENT_READ, data=client)
        self.callback(client)

    def _mark_client_for_sending(self, client, marked):
        if marked:
            self.selector.modify(client.socket, EVENT_READ | EVENT_WRITE,
                data=client)
        else:
            self.selector.modify(client.socket, EVENT_READ, data=client)

    def tick(self, timeout=0):
        """ This will check for any server events and process them.

            If timeout is greater than zero, it will wait at most that
            amount of time in seconds until something happens.
            (This is useful if you want to save some cpu time and you have
            nothing else to do)

            For debugging purposes, it returns the amount of events processed.
        """
        # get rid of old connections we kept around for sending:
        entry_removed = True
        while entry_removed:
            entry_removed = False
            for entry in self.clients_kept_for_sending:
                if entry[1] <= time.time() or len(entry[0].send_buffer) == 0:
                    try:
                        entry[0].close()
                    except:
                        pass
                    self.clients_kept_for_sending.remove(entry)
                    entry_removed = True

        # wait for socket events:
        events = self.selector.select(timeout=timeout)
        events_processed = 0
        for key, mask in events:
            if mask & EVENT_READ != 0:
                events_processed = events_processed + 1
                # handle accept for server socket:
                if key.data == None:
                    conn, addr = self.server_socket.accept()
                    self._handle_new_client(conn, addr)
                    continue
                # handle client socket receive:
                key.data._do_recv()
                continue
            if mask & EVENT_WRITE != 0:
                events_processed = events_processed + 1
                # handle client socket send:
                key.data._do_outstanding_send()
                continue
            logging.debugging("unknown socket event happening, bug?")
        return events_processed

# 需要导入模块: from selectors import DefaultSelector [as 别名]
# 或者: from selectors.DefaultSelector import select [as 别名]
class Main(object):
    def __init__(self, fb):
        assert isinstance(fb, Framebuffer)
        self._fb = fb

        # get all input devices
        devices = [InputDevice(fn) for fn in evdev.list_devices()]
        # filter out non key devices
        for device in devices.copy():
            cap = device.capabilities()
            if ecodes.EV_KEY not in cap:
                devices.remove(device)
                continue

        self._selector = DefaultSelector()
        # This works because InputDevice has a `fileno()` method.
        for device in devices:
            self._selector.register(device, EVENT_READ)

    def _color565(self, r, g, b):
        """Convert red, green, blue components to a 16-bit 565 RGB value. Components
        should be values 0 to 255.
        """
        return (((r & 0xF8) << 8) | ((g & 0xFC) << 3) | (b >> 3))

    def _img_to_rgb565_bytes(self):
        pixels = [self._color565(r, g, b) for (r, g, b) in self._img.getdata()]
        return pack('H' * len(pixels), *pixels)

    def _write_image(self, img):
        if (1 == self._fb.bits_per_pixel):
            image_bytes = img.tobytes("raw", "1;IR", self._fb.line_length)
        else:
            self._img = img
            image_bytes = self._img_to_rgb565_bytes()
        self._fb.write_raw(image_bytes)

    def _do_countdown(self):
        if (1 == self._fb.bits_per_pixel):
            img = Image.new("1", self._fb.resolution, 1)
        else:
            img = Image.new("RGB", self._fb.resolution, 'black')

        fnt = ImageFont.truetype(font="/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf", size=96)
        d = ImageDraw.Draw(img)
        for i in range(3, 0, -1):
            # clear the image
            d.rectangle(((0, 0), self._fb.resolution), fill=1)
            # draw the text
            text_width, text_height = d.textsize(str(i), font=fnt)
            x = (self._fb.resolution.x - text_width) / 2
            y = (self._fb.resolution.y - text_height) / 2
            d.text((x, y), str(i), font=fnt)
            self._write_image(img)
            # give some time to read
            time.sleep(1.25)

    def _draw_text(self, text, size):
        if (1 == self._fb.bits_per_pixel):
            img = Image.new("1", self._fb.resolution, 1)
        else:
            img = Image.new("RGB", self._fb.resolution, 'black')
        fnt = ImageFont.truetype(font="/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf", size=size)
        d = ImageDraw.Draw(img)
        text_width, text_height = d.textsize(text, font=fnt)
        x = (self._fb.resolution.x - text_width) / 2
        y = (self._fb.resolution.y - text_height) / 2
        d.text((x, y), text, font=fnt)
        self._write_image(img)

    def _take_picture(self):
        args = 'fswebcam --quiet --no-banner'
        args += ' --scale {0}x{1}'.format(self._fb.resolution.x, self._fb.resolution.y)
        if self._fb.grayscale or self._fb.bits_per_pixel == 1:
            args += ' --greyscale'
        args += ' --png --save {0}'.format(self._filename)
        fswebcam = Popen(args, shell=True)
        fswebcam.wait()

    def _show_picture(self):
        if (1 == self._fb.bits_per_pixel):
            self._write_image(ImageMath.eval('convert(img, "1")', img=Image.open(self._filename)))
        else:
            self._write_image(img=Image.open(self._filename))

    def run(self):
        self._draw_text('Ready!', 36)
        # TODO: listen for keypresses on a background thread, otherwise they pile up while taking a picture.
        while True:
            for key, mask in self._selector.select():
                device = key.fileobj
                for event in device.read():
                    if event.type != ecodes.EV_KEY:
                        # ignore non-key events
                        continue
                    if not event.value:
                        # ignore key up events
                        continue
                    if event.code in [ecodes.KEY_ENTER, ecodes.KEY_CAMERA]:
                        # enter button or camera button takes a picture
#.........这里部分代码省略.........

# 需要导入模块: from selectors import DefaultSelector [as 别名]
# 或者: from selectors.DefaultSelector import select [as 别名]
# a task get a generator
# then call next to execute the first part, before yied
Task(get('/?q=python+socket+&t=lm&ia=about'))
Task(get('/?q=golang+socket+&t=lm&ia=about'))
Task(get('/?q=rust+socket+&t=lm&ia=about'))
Task(get('/?q=erlang+socket+&t=lm&ia=about'))
Task(get('/?q=python+socket+&t=lm&ia=about'))
Task(get('/?q=golang+socket+&t=lm&ia=about'))
Task(get('/?q=rust+socket+&t=lm&ia=about'))
Task(get('/?q=erlang+socket+&t=lm&ia=about'))
Task(get('/?q=python+socket+&t=lm&ia=about'))
Task(get('/?q=golang+socket+&t=lm&ia=about'))
Task(get('/?q=rust+socket+&t=lm&ia=about'))
Task(get('/?q=erlang+socket+&t=lm&ia=about'))
Task(get('/?q=python+socket+&t=lm&ia=about'))
Task(get('/?q=golang+socket+&t=lm&ia=about'))
Task(get('/?q=rust+socket+&t=lm&ia=about'))
Task(get('/?q=erlang+socket+&t=lm&ia=about'))


while n_tasks:
    # retrieve events
    events = selector.select()
    for event, mask in events:
        future = event.data # retrieve the future
        # call the callbacks associated to the future
        future.resolve()

# get launched serially, so final time is time for one request times number of requests
print("took %.1f sec" % (time.time() - start))