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import logging |
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2
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import os |
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3
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from concurrent.futures import Future |
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4
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import functools |
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5
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import threading |
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try: |
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# we prefer to use bundles asyncio version, otherwise fallback to trollius |
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8
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import asyncio |
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except ImportError: |
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10
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import trollius as asyncio |
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11
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from trollius import From |
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12
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13
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1 |
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class ServiceError(Exception): |
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1 |
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def __init__(self, code): |
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super(ServiceError, self).__init__('UA service error') |
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self.code = code |
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1 |
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class NotEnoughData(Exception): |
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pass |
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class Buffer(object): |
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""" |
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alternative to io.BytesIO making debug easier |
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and added a few conveniance methods |
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""" |
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1 |
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def __init__(self, data, start_pos=0, size=-1): |
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# self.logger = logging.getLogger(__name__) |
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self._data = data |
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self._cur_pos = start_pos |
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if size == -1: |
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size = len(data) - start_pos |
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self._size = size |
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36
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1 |
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def __str__(self): |
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return "Buffer(size:{}, data:{})".format( |
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self._size, |
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self._data[self._cur_pos:self._cur_pos + self._size]) |
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40
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__repr__ = __str__ |
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def __len__(self): |
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return self._size |
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1 |
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def read(self, size): |
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""" |
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read and pop number of bytes for buffer |
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48
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""" |
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49
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1 |
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if size > self._size: |
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raise NotEnoughData("Not enough data left in buffer, request for {}, we have {}".format(size, self)) |
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# self.logger.debug("Request for %s bytes, from %s", size, self) |
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self._size -= size |
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pos = self._cur_pos |
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self._cur_pos += size |
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data = self._data[pos:self._cur_pos] |
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# self.logger.debug("Returning: %s ", data) |
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return data |
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59
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def copy(self, size=-1): |
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""" |
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return a shadow copy, optionnaly only copy 'size' bytes |
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""" |
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63
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1 |
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if size == -1 or size > self._size: |
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size = self._size |
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65
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return Buffer(self._data, self._cur_pos, size) |
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66
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67
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1 |
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def skip(self, size): |
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68
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""" |
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skip size bytes in buffer |
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""" |
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71
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if size > self._size: |
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raise NotEnoughData("Not enough data left in buffer, request for {}, we have {}".format(size, self)) |
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self._size -= size |
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self._cur_pos += size |
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75
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76
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77
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class SocketClosedException(Exception): |
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pass |
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80
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81
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class SocketWrapper(object): |
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82
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""" |
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83
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wrapper to make it possible to have same api for |
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84
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normal sockets, socket from asyncio, StringIO, etc.... |
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85
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""" |
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86
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def __init__(self, sock): |
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87
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self.socket = sock |
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88
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89
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1 |
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def read(self, size): |
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90
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""" |
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91
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Receive up to size bytes from socket |
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92
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""" |
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93
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data = b'' |
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94
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while size > 0: |
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95
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chunk = self.socket.recv(size) |
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96
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if not chunk: |
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raise SocketClosedException("Server socket has closed") |
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data += chunk |
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size -= len(chunk) |
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return data |
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def write(self, data): |
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self.socket.sendall(data) |
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105
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106
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107
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def create_nonce(size=32): |
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108
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return os.urandom(size) |
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109
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110
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111
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112
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113
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1 |
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class ThreadLoop(threading.Thread): |
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114
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""" |
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115
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run an asyncio loop in a thread |
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116
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""" |
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117
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118
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1 |
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def __init__(self): |
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119
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1 |
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threading.Thread.__init__(self) |
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120
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1 |
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self.logger = logging.getLogger(__name__) |
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121
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1 |
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self.loop = None |
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122
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1 |
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self._cond = threading.Condition() |
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123
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124
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1 |
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def start(self): |
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125
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1 |
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with self._cond: |
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126
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1 |
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threading.Thread.start(self) |
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127
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1 |
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self._cond.wait() |
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128
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129
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1 |
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def run(self): |
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130
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1 |
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self.logger.debug("Starting subscription thread") |
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131
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1 |
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self.loop = asyncio.new_event_loop() |
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132
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1 |
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asyncio.set_event_loop(self.loop) |
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133
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1 |
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with self._cond: |
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134
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1 |
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self._cond.notify_all() |
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135
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1 |
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self.loop.run_forever() |
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136
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1 |
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self.logger.debug("subscription thread ended") |
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137
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138
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1 |
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def create_server(self, proto, hostname, port): |
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139
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1 |
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return self.loop.create_server(proto, hostname, port) |
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140
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141
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1 |
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def stop(self): |
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142
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""" |
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143
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stop subscription loop, thus the subscription thread |
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144
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""" |
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145
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1 |
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self.loop.call_soon_threadsafe(self.loop.stop) |
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146
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147
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1 |
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def call_soon(self, callback): |
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148
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1 |
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self.loop.call_soon_threadsafe(callback) |
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149
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150
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1 |
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def call_later(self, delay, callback): |
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151
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""" |
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152
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threadsafe call_later from asyncio |
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153
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""" |
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154
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1 |
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p = functools.partial(self.loop.call_later, delay, callback) |
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155
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1 |
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self.loop.call_soon_threadsafe(p) |
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156
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157
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1 |
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def _create_task(self, future, coro, cb=None): |
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158
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#task = self.loop.create_task(coro) |
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159
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1 |
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task = asyncio.async(coro, loop=self.loop) |
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160
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1 |
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if cb: |
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161
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1 |
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task.add_done_callback(cb) |
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162
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1 |
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future.set_result(task) |
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163
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164
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1 |
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def create_task(self, coro, cb=None): |
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165
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""" |
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166
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threadsafe create_task from asyncio |
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167
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""" |
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168
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1 |
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future = Future() |
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169
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1 |
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p = functools.partial(self._create_task, future, coro, cb) |
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170
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1 |
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self.loop.call_soon_threadsafe(p) |
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171
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1 |
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return future.result() |
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172
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173
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1 |
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def run_coro_and_wait(self, coro): |
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174
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1 |
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cond = threading.Condition() |
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175
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1 |
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def cb(_): |
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176
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1 |
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with cond: |
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177
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1 |
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cond.notify_all() |
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178
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1 |
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with cond: |
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179
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1 |
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task = self.create_task(coro, cb) |
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180
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1 |
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cond.wait() |
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181
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1 |
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return task.result() |
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182
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183
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1 |
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def _run_until_complete(self, future, coro): |
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184
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task = self.loop.run_until_complete(coro) |
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185
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future.set_result(task) |
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186
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187
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1 |
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def run_until_complete(self, coro): |
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188
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""" |
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189
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threadsafe run_until_completed from asyncio |
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190
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""" |
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191
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future = Future() |
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192
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p = functools.partial(self._run_until_complete, future, coro) |
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193
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self.loop.call_soon_threadsafe(p) |
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194
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return future.result() |
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195
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196
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197
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198
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FreeOpcUa /
python-opcua
