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#!/usr/bin/env python |
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# -*- coding: utf-8 -*- |
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# These imports are for python3 compatibility inside python2 |
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from __future__ import absolute_import |
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from __future__ import division |
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from __future__ import print_function |
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import threading |
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import time |
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import cachetools |
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from apex.aprs import util as aprs_util |
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from .util import echo_colorized_frame |
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from .util import echo_colorized_warning |
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class NonrepeatingBuffer(object): |
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def __init__(self, base_tnc, base_name, base_port=None, echo_packets=True, buffer_size=10000, buffer_time=30): |
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self.packet_cache = cachetools.TTLCache(buffer_size, buffer_time) |
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self.lock = threading.Lock() |
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self.base_tnc = base_tnc |
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self.base_port = base_port |
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self.base_name = base_name |
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self.echo_packets = echo_packets |
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@property |
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def port(self): |
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return self.base_port |
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@property |
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def name(self): |
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return self.base_name |
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def connect(self, *args, **kwargs): |
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self.base_tnc.connect(*args, **kwargs) |
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def close(self, *args, **kwargs): |
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self.base_tnc.close(*args, **kwargs) |
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def write(self, frame, *args, **kwargs): |
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with self.lock: |
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frame_hash = str(aprs_util.hash_frame(frame)) |
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if frame_hash not in self.packet_cache: |
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self.packet_cache[frame_hash] = frame |
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if self.base_port: |
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self.base_tnc.write(frame, self.base_port) |
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else: |
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self.base_tnc.write(frame) |
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if self.echo_packets: |
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echo_colorized_frame(frame, self.base_name, False) |
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def read(self, *args, **kwargs): |
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with self.lock: |
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frame = self.base_tnc.read(*args, **kwargs) |
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if not frame: |
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return frame |
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frame_hash = str(aprs_util.hash_frame(frame)) |
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if frame_hash not in self.packet_cache: |
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self.packet_cache[frame_hash] = frame |
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if self.echo_packets: |
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echo_colorized_frame(frame, self.base_name, True) |
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return frame |
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else: |
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return None |
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class ReconnectingPacketBuffer(object): |
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STARTING_WAIT_TIME = 2 |
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MAX_WAIT_TIME = 300 |
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WAIT_TIME_MULTIPLIER = 2 |
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MAX_INDEX = 1000000 |
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def __init__(self, packet_layer): |
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self.packet_layer = packet_layer |
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self.to_packet_layer = cachetools.TTLCache(10, 30) |
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self.current_index = 0 |
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self.from_packet_layer = cachetools.TTLCache(10, 30) |
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self.connect_thread = None |
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self.lock = threading.Lock() |
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self.running = False |
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self.reconnect_wait_time = self.STARTING_WAIT_TIME |
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self.last_connect_attempt = None |
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self.connect_args = None |
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self.connect_kwargs = None |
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self.connected = False |
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def __increment_wait_time(self): |
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self.reconnect_wait_time *= self.WAIT_TIME_MULTIPLIER |
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if self.reconnect_wait_time > self.MAX_WAIT_TIME: |
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self.reconnect_wait_time = self.MAX_WAIT_TIME |
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def __reset_wait_time(self): |
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self.reconnect_wait_time = self.STARTING_WAIT_TIME |
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def __run(self): |
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while self.running: |
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if not self.connected: |
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if not self.last_connect_attempt or time.time() - self.last_connect_attempt > self.reconnect_wait_time: |
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try: |
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self.last_connect_attempt = time.time() |
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self.packet_layer.connect(*self.connect_args, **self.connect_kwargs) |
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self.connected = True |
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except IOError: |
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echo_colorized_warning('Could not connect, will reattempt.') |
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try: |
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self.packet_layer.close() |
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except IOError: |
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pass |
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self.__increment_wait_time() |
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else: |
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time.sleep(1) |
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else: |
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io_occured = False |
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# lets attempt to read in a packet |
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try: |
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read_packet = self.packet_layer.read() |
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self.__reset_wait_time() |
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if read_packet: |
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with self.lock: |
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self.from_packet_layer[str(aprs_util.hash_frame(read_packet))] = read_packet |
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io_occured = True |
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except IOError: |
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echo_colorized_warning('Read failed. Will disconnect and attempt to reconnect.') |
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try: |
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self.packet_layer.close() |
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except IOError: |
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pass |
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self.connected = False |
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continue |
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# lets try to write a packet, if any are waiting. |
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write_packet = None |
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with self.lock: |
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if self.to_packet_layer: |
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write_packet = self.to_packet_layer.popitem()[1] |
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if write_packet: |
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try: |
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self.packet_layer.write(write_packet) |
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io_occured = True |
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self.__reset_wait_time() |
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except IOError: |
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echo_colorized_warning('Write failed. Will disconnect and attempt to reconnect.') |
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self.to_packet_layer[str(aprs_util.hash_frame(read_packet))] = write_packet |
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try: |
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self.packet_layer.close() |
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except IOError: |
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pass |
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self.connected = False |
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continue |
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if not io_occured: |
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time.sleep(1) |
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try: |
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self.packet_layer.close() |
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except IOError: |
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pass |
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def connect(self, *args, **kwargs): |
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with self.lock: |
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if self.connect_thread: |
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raise RuntimeError('already connected') |
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self.running = True |
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self.connect_args = args |
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self.connect_kwargs = kwargs |
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self.connect_thread = threading.Thread(target=self.__run) |
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self.connect_thread.start() |
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def close(self): |
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with self.lock: |
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if not self.connect_thread: |
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raise RuntimeError('not connected') |
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self.running = False |
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self.connect_thread.join() |
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self.connect_thread = None |
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def read(self): |
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with self.lock: |
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if self.from_packet_layer: |
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return self.from_packet_layer.popitem()[1] |
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return None |
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def write(self, packet): |
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with self.lock: |
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self.to_packet_layer[str(aprs_util.hash_frame(packet))] = packet |
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