| 1 | |
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| 2 | |
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| 3 | |
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| 4 | |
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| 5 | """ |
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| 6 | Very basic functionality for a Reactor implementation. |
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| 7 | """ |
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| 8 | |
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| 9 | import socket |
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| 10 | from zope.interface import implements, classImplements |
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| 11 | |
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| 12 | import sys |
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| 13 | import warnings |
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| 14 | from heapq import heappush, heappop, heapify |
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| 15 | |
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| 16 | import traceback |
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| 17 | |
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| 18 | from twisted.python.compat import set |
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| 19 | from twisted.python.util import unsignedID |
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| 20 | from twisted.internet.interfaces import IReactorCore, IReactorTime, IReactorThreads |
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| 21 | from twisted.internet.interfaces import IResolverSimple, IReactorPluggableResolver |
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| 22 | from twisted.internet.interfaces import IConnector, IDelayedCall |
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| 23 | from twisted.internet import fdesc, main, error, abstract, defer, threads |
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| 24 | from twisted.python import log, failure, reflect |
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| 25 | from twisted.python.runtime import seconds as runtimeSeconds, platform |
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| 26 | from twisted.internet.defer import Deferred, DeferredList |
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| 27 | from twisted.persisted import styles |
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| 28 | |
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| 29 | |
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| 30 | |
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| 31 | from twisted.python import threadable |
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| 32 | |
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| 33 | |
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| 34 | class DelayedCall(styles.Ephemeral): |
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| 35 | |
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| 36 | implements(IDelayedCall) |
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| 37 | |
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| 38 | |
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| 39 | debug = False |
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| 40 | _str = None |
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| 41 | |
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| 42 | def __init__(self, time, func, args, kw, cancel, reset, |
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| 43 | seconds=runtimeSeconds): |
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| 44 | """ |
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| 45 | @param time: Seconds from the epoch at which to call C{func}. |
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| 46 | @param func: The callable to call. |
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| 47 | @param args: The positional arguments to pass to the callable. |
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| 48 | @param kw: The keyword arguments to pass to the callable. |
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| 49 | @param cancel: A callable which will be called with this |
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| 50 | DelayedCall before cancellation. |
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| 51 | @param reset: A callable which will be called with this |
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| 52 | DelayedCall after changing this DelayedCall's scheduled |
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| 53 | execution time. The callable should adjust any necessary |
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| 54 | scheduling details to ensure this DelayedCall is invoked |
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| 55 | at the new appropriate time. |
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| 56 | @param seconds: If provided, a no-argument callable which will be |
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| 57 | used to determine the current time any time that information is |
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| 58 | needed. |
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| 59 | """ |
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| 60 | self.time, self.func, self.args, self.kw = time, func, args, kw |
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| 61 | self.resetter = reset |
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| 62 | self.canceller = cancel |
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| 63 | self.seconds = seconds |
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| 64 | self.cancelled = self.called = 0 |
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| 65 | self.delayed_time = 0 |
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| 66 | if self.debug: |
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| 67 | self.creator = traceback.format_stack()[:-2] |
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| 68 | |
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| 69 | def getTime(self): |
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| 70 | """Return the time at which this call will fire |
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| 71 | |
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| 72 | @rtype: C{float} |
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| 73 | @return: The number of seconds after the epoch at which this call is |
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| 74 | scheduled to be made. |
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| 75 | """ |
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| 76 | return self.time + self.delayed_time |
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| 77 | |
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| 78 | def cancel(self): |
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| 79 | """Unschedule this call |
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| 80 | |
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| 81 | @raise AlreadyCancelled: Raised if this call has already been |
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| 82 | unscheduled. |
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| 83 | |
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| 84 | @raise AlreadyCalled: Raised if this call has already been made. |
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| 85 | """ |
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| 86 | if self.cancelled: |
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| 87 | raise error.AlreadyCancelled |
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| 88 | elif self.called: |
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| 89 | raise error.AlreadyCalled |
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| 90 | else: |
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| 91 | self.canceller(self) |
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| 92 | self.cancelled = 1 |
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| 93 | if self.debug: |
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| 94 | self._str = str(self) |
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| 95 | del self.func, self.args, self.kw |
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| 96 | |
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| 97 | def reset(self, secondsFromNow): |
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| 98 | """Reschedule this call for a different time |
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| 99 | |
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| 100 | @type secondsFromNow: C{float} |
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| 101 | @param secondsFromNow: The number of seconds from the time of the |
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| 102 | C{reset} call at which this call will be scheduled. |
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| 103 | |
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| 104 | @raise AlreadyCancelled: Raised if this call has been cancelled. |
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| 105 | @raise AlreadyCalled: Raised if this call has already been made. |
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| 106 | """ |
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| 107 | if self.cancelled: |
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| 108 | raise error.AlreadyCancelled |
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| 109 | elif self.called: |
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| 110 | raise error.AlreadyCalled |
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| 111 | else: |
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| 112 | newTime = self.seconds() + secondsFromNow |
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| 113 | if newTime < self.time: |
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| 114 | self.delayed_time = 0 |
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| 115 | self.time = newTime |
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| 116 | self.resetter(self) |
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| 117 | else: |
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| 118 | self.delayed_time = newTime - self.time |
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| 119 | |
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| 120 | def delay(self, secondsLater): |
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| 121 | """Reschedule this call for a later time |
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| 122 | |
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| 123 | @type secondsLater: C{float} |
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| 124 | @param secondsLater: The number of seconds after the originally |
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| 125 | scheduled time for which to reschedule this call. |
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| 126 | |
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| 127 | @raise AlreadyCancelled: Raised if this call has been cancelled. |
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| 128 | @raise AlreadyCalled: Raised if this call has already been made. |
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| 129 | """ |
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| 130 | if self.cancelled: |
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| 131 | raise error.AlreadyCancelled |
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| 132 | elif self.called: |
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| 133 | raise error.AlreadyCalled |
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| 134 | else: |
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| 135 | self.delayed_time += secondsLater |
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| 136 | if self.delayed_time < 0: |
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| 137 | self.activate_delay() |
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| 138 | self.resetter(self) |
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| 139 | |
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| 140 | def activate_delay(self): |
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| 141 | self.time += self.delayed_time |
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| 142 | self.delayed_time = 0 |
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| 143 | |
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| 144 | def active(self): |
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| 145 | """Determine whether this call is still pending |
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| 146 | |
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| 147 | @rtype: C{bool} |
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| 148 | @return: True if this call has not yet been made or cancelled, |
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| 149 | False otherwise. |
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| 150 | """ |
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| 151 | return not (self.cancelled or self.called) |
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| 152 | |
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| 153 | |
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| 154 | def __le__(self, other): |
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| 155 | """ |
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| 156 | Implement C{<=} operator between two L{DelayedCall} instances. |
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| 157 | |
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| 158 | Comparison is based on the C{time} attribute (unadjusted by the |
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| 159 | delayed time). |
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| 160 | """ |
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| 161 | return self.time <= other.time |
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| 162 | |
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| 163 | |
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| 164 | def __lt__(self, other): |
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| 165 | """ |
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| 166 | Implement C{<} operator between two L{DelayedCall} instances. |
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| 167 | |
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| 168 | Comparison is based on the C{time} attribute (unadjusted by the |
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| 169 | delayed time). |
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| 170 | """ |
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| 171 | return self.time < other.time |
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| 172 | |
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| 173 | |
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| 174 | def __str__(self): |
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| 175 | if self._str is not None: |
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| 176 | return self._str |
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| 177 | if hasattr(self, 'func'): |
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| 178 | if hasattr(self.func, 'func_name'): |
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| 179 | func = self.func.func_name |
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| 180 | if hasattr(self.func, 'im_class'): |
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| 181 | func = self.func.im_class.__name__ + '.' + func |
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| 182 | else: |
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| 183 | func = reflect.safe_repr(self.func) |
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| 184 | else: |
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| 185 | func = None |
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| 186 | |
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| 187 | now = self.seconds() |
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| 188 | L = ["<DelayedCall 0x%x [%ss] called=%s cancelled=%s" % ( |
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| 189 | unsignedID(self), self.time - now, self.called, |
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| 190 | self.cancelled)] |
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| 191 | if func is not None: |
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| 192 | L.extend((" ", func, "(")) |
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| 193 | if self.args: |
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| 194 | L.append(", ".join([reflect.safe_repr(e) for e in self.args])) |
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| 195 | if self.kw: |
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| 196 | L.append(", ") |
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| 197 | if self.kw: |
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| 198 | L.append(", ".join(['%s=%s' % (k, reflect.safe_repr(v)) for (k, v) in self.kw.iteritems()])) |
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| 199 | L.append(")") |
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| 200 | |
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| 201 | if self.debug: |
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| 202 | L.append("\n\ntraceback at creation: \n\n%s" % (' '.join(self.creator))) |
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| 203 | L.append('>') |
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| 204 | |
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| 205 | return "".join(L) |
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| 206 | |
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| 207 | |
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| 208 | |
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| 209 | class ThreadedResolver(object): |
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| 210 | """ |
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| 211 | L{ThreadedResolver} uses a reactor, a threadpool, and |
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| 212 | L{socket.gethostbyname} to perform name lookups without blocking the |
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| 213 | reactor thread. It also supports timeouts indepedently from whatever |
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| 214 | timeout logic L{socket.gethostbyname} might have. |
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| 215 | |
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| 216 | @ivar reactor: The reactor the threadpool of which will be used to call |
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| 217 | L{socket.gethostbyname} and the I/O thread of which the result will be |
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| 218 | delivered. |
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| 219 | """ |
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| 220 | implements(IResolverSimple) |
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| 221 | |
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| 222 | def __init__(self, reactor): |
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| 223 | self.reactor = reactor |
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| 224 | self._runningQueries = {} |
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| 225 | |
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| 226 | |
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| 227 | def _fail(self, name, err): |
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| 228 | err = error.DNSLookupError("address %r not found: %s" % (name, err)) |
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| 229 | return failure.Failure(err) |
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| 230 | |
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| 231 | |
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| 232 | def _cleanup(self, name, lookupDeferred): |
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| 233 | userDeferred, cancelCall = self._runningQueries[lookupDeferred] |
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| 234 | del self._runningQueries[lookupDeferred] |
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| 235 | userDeferred.errback(self._fail(name, "timeout error")) |
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| 236 | |
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| 237 | |
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| 238 | def _checkTimeout(self, result, name, lookupDeferred): |
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| 239 | try: |
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| 240 | userDeferred, cancelCall = self._runningQueries[lookupDeferred] |
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| 241 | except KeyError: |
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| 242 | pass |
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| 243 | else: |
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| 244 | del self._runningQueries[lookupDeferred] |
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| 245 | cancelCall.cancel() |
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| 246 | |
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| 247 | if isinstance(result, failure.Failure): |
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| 248 | userDeferred.errback(self._fail(name, result.getErrorMessage())) |
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| 249 | else: |
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| 250 | userDeferred.callback(result) |
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| 251 | |
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| 252 | |
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| 253 | def getHostByName(self, name, timeout = (1, 3, 11, 45)): |
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| 254 | """ |
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| 255 | See L{twisted.internet.interfaces.IResolverSimple.getHostByName}. |
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| 256 | |
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| 257 | Note that the elements of C{timeout} are summed and the result is used |
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| 258 | as a timeout for the lookup. Any intermediate timeout or retry logic |
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| 259 | is left up to the platform via L{socket.gethostbyname}. |
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| 260 | """ |
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| 261 | if timeout: |
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| 262 | timeoutDelay = sum(timeout) |
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| 263 | else: |
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| 264 | timeoutDelay = 60 |
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| 265 | userDeferred = defer.Deferred() |
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| 266 | lookupDeferred = threads.deferToThreadPool( |
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| 267 | self.reactor, self.reactor.getThreadPool(), |
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| 268 | socket.gethostbyname, name) |
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| 269 | cancelCall = self.reactor.callLater( |
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| 270 | timeoutDelay, self._cleanup, name, lookupDeferred) |
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| 271 | self._runningQueries[lookupDeferred] = (userDeferred, cancelCall) |
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| 272 | lookupDeferred.addBoth(self._checkTimeout, name, lookupDeferred) |
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| 273 | return userDeferred |
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| 274 | |
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| 275 | |
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| 276 | |
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| 277 | class BlockingResolver: |
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| 278 | implements(IResolverSimple) |
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| 279 | |
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| 280 | def getHostByName(self, name, timeout = (1, 3, 11, 45)): |
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| 281 | try: |
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| 282 | address = socket.gethostbyname(name) |
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| 283 | except socket.error: |
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| 284 | msg = "address %r not found" % (name,) |
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| 285 | err = error.DNSLookupError(msg) |
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| 286 | return defer.fail(err) |
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| 287 | else: |
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| 288 | return defer.succeed(address) |
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| 289 | |
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| 290 | |
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| 291 | class _ThreePhaseEvent(object): |
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| 292 | """ |
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| 293 | Collection of callables (with arguments) which can be invoked as a group in |
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| 294 | a particular order. |
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| 295 | |
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| 296 | This provides the underlying implementation for the reactor's system event |
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| 297 | triggers. An instance of this class tracks triggers for all phases of a |
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| 298 | single type of event. |
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| 299 | |
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| 300 | @ivar before: A list of the before-phase triggers containing three-tuples |
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| 301 | of a callable, a tuple of positional arguments, and a dict of keyword |
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| 302 | arguments |
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| 303 | |
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| 304 | @ivar finishedBefore: A list of the before-phase triggers which have |
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| 305 | already been executed. This is only populated in the C{'BEFORE'} state. |
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| 306 | |
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| 307 | @ivar during: A list of the during-phase triggers containing three-tuples |
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| 308 | of a callable, a tuple of positional arguments, and a dict of keyword |
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| 309 | arguments |
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| 310 | |
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| 311 | @ivar after: A list of the after-phase triggers containing three-tuples |
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| 312 | of a callable, a tuple of positional arguments, and a dict of keyword |
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| 313 | arguments |
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| 314 | |
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| 315 | @ivar state: A string indicating what is currently going on with this |
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| 316 | object. One of C{'BASE'} (for when nothing in particular is happening; |
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| 317 | this is the initial value), C{'BEFORE'} (when the before-phase triggers |
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| 318 | are in the process of being executed). |
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| 319 | """ |
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| 320 | def __init__(self): |
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| 321 | self.before = [] |
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| 322 | self.during = [] |
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| 323 | self.after = [] |
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| 324 | self.state = 'BASE' |
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| 325 | |
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| 326 | |
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| 327 | def addTrigger(self, phase, callable, *args, **kwargs): |
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| 328 | """ |
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| 329 | Add a trigger to the indicate phase. |
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| 330 | |
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| 331 | @param phase: One of C{'before'}, C{'during'}, or C{'after'}. |
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| 332 | |
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| 333 | @param callable: An object to be called when this event is triggered. |
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| 334 | @param *args: Positional arguments to pass to C{callable}. |
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| 335 | @param **kwargs: Keyword arguments to pass to C{callable}. |
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| 336 | |
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| 337 | @return: An opaque handle which may be passed to L{removeTrigger} to |
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| 338 | reverse the effects of calling this method. |
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| 339 | """ |
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| 340 | if phase not in ('before', 'during', 'after'): |
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| 341 | raise KeyError("invalid phase") |
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| 342 | getattr(self, phase).append((callable, args, kwargs)) |
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| 343 | return phase, callable, args, kwargs |
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| 344 | |
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| 345 | |
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| 346 | def removeTrigger(self, handle): |
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| 347 | """ |
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| 348 | Remove a previously added trigger callable. |
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| 349 | |
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| 350 | @param handle: An object previously returned by L{addTrigger}. The |
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| 351 | trigger added by that call will be removed. |
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| 352 | |
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| 353 | @raise ValueError: If the trigger associated with C{handle} has already |
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| 354 | been removed or if C{handle} is not a valid handle. |
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| 355 | """ |
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| 356 | return getattr(self, 'removeTrigger_' + self.state)(handle) |
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| 357 | |
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| 358 | |
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| 359 | def removeTrigger_BASE(self, handle): |
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| 360 | """ |
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| 361 | Just try to remove the trigger. |
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| 362 | |
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| 363 | @see: removeTrigger |
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| 364 | """ |
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| 365 | try: |
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| 366 | phase, callable, args, kwargs = handle |
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| 367 | except (TypeError, ValueError), e: |
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| 368 | raise ValueError("invalid trigger handle") |
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| 369 | else: |
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| 370 | if phase not in ('before', 'during', 'after'): |
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| 371 | raise KeyError("invalid phase") |
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| 372 | getattr(self, phase).remove((callable, args, kwargs)) |
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| 373 | |
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| 374 | |
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| 375 | def removeTrigger_BEFORE(self, handle): |
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| 376 | """ |
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| 377 | Remove the trigger if it has yet to be executed, otherwise emit a |
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| 378 | warning that in the future an exception will be raised when removing an |
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| 379 | already-executed trigger. |
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| 380 | |
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| 381 | @see: removeTrigger |
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| 382 | """ |
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| 383 | phase, callable, args, kwargs = handle |
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| 384 | if phase != 'before': |
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| 385 | return self.removeTrigger_BASE(handle) |
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| 386 | if (callable, args, kwargs) in self.finishedBefore: |
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| 387 | warnings.warn( |
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| 388 | "Removing already-fired system event triggers will raise an " |
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| 389 | "exception in a future version of Twisted.", |
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| 390 | category=DeprecationWarning, |
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| 391 | stacklevel=3) |
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| 392 | else: |
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| 393 | self.removeTrigger_BASE(handle) |
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| 394 | |
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| 395 | |
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| 396 | def fireEvent(self): |
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| 397 | """ |
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| 398 | Call the triggers added to this event. |
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| 399 | """ |
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| 400 | self.state = 'BEFORE' |
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| 401 | self.finishedBefore = [] |
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| 402 | beforeResults = [] |
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| 403 | while self.before: |
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| 404 | callable, args, kwargs = self.before.pop(0) |
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| 405 | self.finishedBefore.append((callable, args, kwargs)) |
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| 406 | try: |
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| 407 | result = callable(*args, **kwargs) |
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| 408 | except: |
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| 409 | log.err() |
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| 410 | else: |
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| 411 | if isinstance(result, Deferred): |
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| 412 | beforeResults.append(result) |
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| 413 | DeferredList(beforeResults).addCallback(self._continueFiring) |
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| 414 | |
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| 415 | |
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| 416 | def _continueFiring(self, ignored): |
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| 417 | """ |
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| 418 | Call the during and after phase triggers for this event. |
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| 419 | """ |
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| 420 | self.state = 'BASE' |
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| 421 | self.finishedBefore = [] |
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| 422 | for phase in self.during, self.after: |
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| 423 | while phase: |
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| 424 | callable, args, kwargs = phase.pop(0) |
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| 425 | try: |
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| 426 | callable(*args, **kwargs) |
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| 427 | except: |
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| 428 | log.err() |
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| 429 | |
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| 430 | |
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| 431 | |
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| 432 | class ReactorBase(object): |
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| 433 | """ |
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| 434 | Default base class for Reactors. |
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| 435 | |
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| 436 | @type _stopped: C{bool} |
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| 437 | @ivar _stopped: A flag which is true between paired calls to C{reactor.run} |
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| 438 | and C{reactor.stop}. This should be replaced with an explicit state |
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| 439 | machine. |
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| 440 | |
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| 441 | @type _justStopped: C{bool} |
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| 442 | @ivar _justStopped: A flag which is true between the time C{reactor.stop} |
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| 443 | is called and the time the shutdown system event is fired. This is |
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| 444 | used to determine whether that event should be fired after each |
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| 445 | iteration through the mainloop. This should be replaced with an |
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| 446 | explicit state machine. |
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| 447 | |
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| 448 | @type _started: C{bool} |
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| 449 | @ivar _started: A flag which is true from the time C{reactor.run} is called |
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| 450 | until the time C{reactor.run} returns. This is used to prevent calls |
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| 451 | to C{reactor.run} on a running reactor. This should be replaced with |
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| 452 | an explicit state machine. |
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| 453 | |
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| 454 | @ivar running: See L{IReactorCore.running} |
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| 455 | """ |
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| 456 | implements(IReactorCore, IReactorTime, IReactorPluggableResolver) |
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| 457 | |
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| 458 | _stopped = True |
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| 459 | installed = False |
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| 460 | usingThreads = False |
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| 461 | resolver = BlockingResolver() |
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| 462 | |
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| 463 | __name__ = "twisted.internet.reactor" |
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| 464 | |
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| 465 | def __init__(self): |
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| 466 | self.threadCallQueue = [] |
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| 467 | self._eventTriggers = {} |
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| 468 | self._pendingTimedCalls = [] |
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| 469 | self._newTimedCalls = [] |
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| 470 | self._cancellations = 0 |
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| 471 | self.running = False |
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| 472 | self._started = False |
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| 473 | self._justStopped = False |
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| 474 | |
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| 475 | self._internalReaders = set() |
|---|
| 476 | self.waker = None |
|---|
| 477 | |
|---|
| 478 | |
|---|
| 479 | |
|---|
| 480 | |
|---|
| 481 | self.addSystemEventTrigger( |
|---|
| 482 | 'during', 'startup', self._reallyStartRunning) |
|---|
| 483 | self.addSystemEventTrigger('during', 'shutdown', self.crash) |
|---|
| 484 | self.addSystemEventTrigger('during', 'shutdown', self.disconnectAll) |
|---|
| 485 | |
|---|
| 486 | if platform.supportsThreads(): |
|---|
| 487 | self._initThreads() |
|---|
| 488 | self.installWaker() |
|---|
| 489 | |
|---|
| 490 | |
|---|
| 491 | |
|---|
| 492 | _lock = None |
|---|
| 493 | |
|---|
| 494 | def installWaker(self): |
|---|
| 495 | raise NotImplementedError( |
|---|
| 496 | reflect.qual(self.__class__) + " did not implement installWaker") |
|---|
| 497 | |
|---|
| 498 | def installResolver(self, resolver): |
|---|
| 499 | assert IResolverSimple.providedBy(resolver) |
|---|
| 500 | oldResolver = self.resolver |
|---|
| 501 | self.resolver = resolver |
|---|
| 502 | return oldResolver |
|---|
| 503 | |
|---|
| 504 | def wakeUp(self): |
|---|
| 505 | """ |
|---|
| 506 | Wake up the event loop. |
|---|
| 507 | """ |
|---|
| 508 | if self.waker: |
|---|
| 509 | self.waker.wakeUp() |
|---|
| 510 | |
|---|
| 511 | |
|---|
| 512 | |
|---|
| 513 | def doIteration(self, delay): |
|---|
| 514 | """ |
|---|
| 515 | Do one iteration over the readers and writers which have been added. |
|---|
| 516 | """ |
|---|
| 517 | raise NotImplementedError( |
|---|
| 518 | reflect.qual(self.__class__) + " did not implement doIteration") |
|---|
| 519 | |
|---|
| 520 | def addReader(self, reader): |
|---|
| 521 | raise NotImplementedError( |
|---|
| 522 | reflect.qual(self.__class__) + " did not implement addReader") |
|---|
| 523 | |
|---|
| 524 | def addWriter(self, writer): |
|---|
| 525 | raise NotImplementedError( |
|---|
| 526 | reflect.qual(self.__class__) + " did not implement addWriter") |
|---|
| 527 | |
|---|
| 528 | def removeReader(self, reader): |
|---|
| 529 | raise NotImplementedError( |
|---|
| 530 | reflect.qual(self.__class__) + " did not implement removeReader") |
|---|
| 531 | |
|---|
| 532 | def removeWriter(self, writer): |
|---|
| 533 | raise NotImplementedError( |
|---|
| 534 | reflect.qual(self.__class__) + " did not implement removeWriter") |
|---|
| 535 | |
|---|
| 536 | def removeAll(self): |
|---|
| 537 | raise NotImplementedError( |
|---|
| 538 | reflect.qual(self.__class__) + " did not implement removeAll") |
|---|
| 539 | |
|---|
| 540 | |
|---|
| 541 | def getReaders(self): |
|---|
| 542 | raise NotImplementedError( |
|---|
| 543 | reflect.qual(self.__class__) + " did not implement getReaders") |
|---|
| 544 | |
|---|
| 545 | |
|---|
| 546 | def getWriters(self): |
|---|
| 547 | raise NotImplementedError( |
|---|
| 548 | reflect.qual(self.__class__) + " did not implement getWriters") |
|---|
| 549 | |
|---|
| 550 | |
|---|
| 551 | def resolve(self, name, timeout = (1, 3, 11, 45)): |
|---|
| 552 | """Return a Deferred that will resolve a hostname. |
|---|
| 553 | """ |
|---|
| 554 | if not name: |
|---|
| 555 | |
|---|
| 556 | return defer.succeed('0.0.0.0') |
|---|
| 557 | if abstract.isIPAddress(name): |
|---|
| 558 | return defer.succeed(name) |
|---|
| 559 | return self.resolver.getHostByName(name, timeout) |
|---|
| 560 | |
|---|
| 561 | |
|---|
| 562 | |
|---|
| 563 | |
|---|
| 564 | def stop(self): |
|---|
| 565 | """ |
|---|
| 566 | See twisted.internet.interfaces.IReactorCore.stop. |
|---|
| 567 | """ |
|---|
| 568 | if self._stopped: |
|---|
| 569 | raise error.ReactorNotRunning( |
|---|
| 570 | "Can't stop reactor that isn't running.") |
|---|
| 571 | self._stopped = True |
|---|
| 572 | self._justStopped = True |
|---|
| 573 | |
|---|
| 574 | |
|---|
| 575 | def crash(self): |
|---|
| 576 | """ |
|---|
| 577 | See twisted.internet.interfaces.IReactorCore.crash. |
|---|
| 578 | |
|---|
| 579 | Reset reactor state tracking attributes and re-initialize certain |
|---|
| 580 | state-transition helpers which were set up in C{__init__} but later |
|---|
| 581 | destroyed (through use). |
|---|
| 582 | """ |
|---|
| 583 | self._started = False |
|---|
| 584 | self.running = False |
|---|
| 585 | self.addSystemEventTrigger( |
|---|
| 586 | 'during', 'startup', self._reallyStartRunning) |
|---|
| 587 | |
|---|
| 588 | def sigInt(self, *args): |
|---|
| 589 | """Handle a SIGINT interrupt. |
|---|
| 590 | """ |
|---|
| 591 | log.msg("Received SIGINT, shutting down.") |
|---|
| 592 | self.callFromThread(self.stop) |
|---|
| 593 | |
|---|
| 594 | def sigBreak(self, *args): |
|---|
| 595 | """Handle a SIGBREAK interrupt. |
|---|
| 596 | """ |
|---|
| 597 | log.msg("Received SIGBREAK, shutting down.") |
|---|
| 598 | self.callFromThread(self.stop) |
|---|
| 599 | |
|---|
| 600 | def sigTerm(self, *args): |
|---|
| 601 | """Handle a SIGTERM interrupt. |
|---|
| 602 | """ |
|---|
| 603 | log.msg("Received SIGTERM, shutting down.") |
|---|
| 604 | self.callFromThread(self.stop) |
|---|
| 605 | |
|---|
| 606 | def disconnectAll(self): |
|---|
| 607 | """Disconnect every reader, and writer in the system. |
|---|
| 608 | """ |
|---|
| 609 | selectables = self.removeAll() |
|---|
| 610 | for reader in selectables: |
|---|
| 611 | log.callWithLogger(reader, |
|---|
| 612 | reader.connectionLost, |
|---|
| 613 | failure.Failure(main.CONNECTION_LOST)) |
|---|
| 614 | |
|---|
| 615 | |
|---|
| 616 | def iterate(self, delay=0): |
|---|
| 617 | """See twisted.internet.interfaces.IReactorCore.iterate. |
|---|
| 618 | """ |
|---|
| 619 | self.runUntilCurrent() |
|---|
| 620 | self.doIteration(delay) |
|---|
| 621 | |
|---|
| 622 | |
|---|
| 623 | def fireSystemEvent(self, eventType): |
|---|
| 624 | """See twisted.internet.interfaces.IReactorCore.fireSystemEvent. |
|---|
| 625 | """ |
|---|
| 626 | event = self._eventTriggers.get(eventType) |
|---|
| 627 | if event is not None: |
|---|
| 628 | event.fireEvent() |
|---|
| 629 | |
|---|
| 630 | |
|---|
| 631 | def addSystemEventTrigger(self, _phase, _eventType, _f, *args, **kw): |
|---|
| 632 | """See twisted.internet.interfaces.IReactorCore.addSystemEventTrigger. |
|---|
| 633 | """ |
|---|
| 634 | assert callable(_f), "%s is not callable" % _f |
|---|
| 635 | if _eventType not in self._eventTriggers: |
|---|
| 636 | self._eventTriggers[_eventType] = _ThreePhaseEvent() |
|---|
| 637 | return (_eventType, self._eventTriggers[_eventType].addTrigger( |
|---|
| 638 | _phase, _f, *args, **kw)) |
|---|
| 639 | |
|---|
| 640 | |
|---|
| 641 | def removeSystemEventTrigger(self, triggerID): |
|---|
| 642 | """See twisted.internet.interfaces.IReactorCore.removeSystemEventTrigger. |
|---|
| 643 | """ |
|---|
| 644 | eventType, handle = triggerID |
|---|
| 645 | self._eventTriggers[eventType].removeTrigger(handle) |
|---|
| 646 | |
|---|
| 647 | |
|---|
| 648 | def callWhenRunning(self, _callable, *args, **kw): |
|---|
| 649 | """See twisted.internet.interfaces.IReactorCore.callWhenRunning. |
|---|
| 650 | """ |
|---|
| 651 | if self.running: |
|---|
| 652 | _callable(*args, **kw) |
|---|
| 653 | else: |
|---|
| 654 | return self.addSystemEventTrigger('after', 'startup', |
|---|
| 655 | _callable, *args, **kw) |
|---|
| 656 | |
|---|
| 657 | def startRunning(self): |
|---|
| 658 | """ |
|---|
| 659 | Method called when reactor starts: do some initialization and fire |
|---|
| 660 | startup events. |
|---|
| 661 | |
|---|
| 662 | Don't call this directly, call reactor.run() instead: it should take |
|---|
| 663 | care of calling this. |
|---|
| 664 | |
|---|
| 665 | This method is somewhat misnamed. The reactor will not necessarily be |
|---|
| 666 | in the running state by the time this method returns. The only |
|---|
| 667 | guarantee is that it will be on its way to the running state. |
|---|
| 668 | """ |
|---|
| 669 | if self._started: |
|---|
| 670 | raise error.ReactorAlreadyRunning() |
|---|
| 671 | self._started = True |
|---|
| 672 | self._stopped = False |
|---|
| 673 | threadable.registerAsIOThread() |
|---|
| 674 | self.fireSystemEvent('startup') |
|---|
| 675 | |
|---|
| 676 | |
|---|
| 677 | def _reallyStartRunning(self): |
|---|
| 678 | """ |
|---|
| 679 | Method called to transition to the running state. This should happen |
|---|
| 680 | in the I{during startup} event trigger phase. |
|---|
| 681 | """ |
|---|
| 682 | self.running = True |
|---|
| 683 | |
|---|
| 684 | |
|---|
| 685 | |
|---|
| 686 | seconds = staticmethod(runtimeSeconds) |
|---|
| 687 | |
|---|
| 688 | def callLater(self, _seconds, _f, *args, **kw): |
|---|
| 689 | """See twisted.internet.interfaces.IReactorTime.callLater. |
|---|
| 690 | """ |
|---|
| 691 | assert callable(_f), "%s is not callable" % _f |
|---|
| 692 | assert sys.maxint >= _seconds >= 0, \ |
|---|
| 693 | "%s is not greater than or equal to 0 seconds" % (_seconds,) |
|---|
| 694 | tple = DelayedCall(self.seconds() + _seconds, _f, args, kw, |
|---|
| 695 | self._cancelCallLater, |
|---|
| 696 | self._moveCallLaterSooner, |
|---|
| 697 | seconds=self.seconds) |
|---|
| 698 | self._newTimedCalls.append(tple) |
|---|
| 699 | return tple |
|---|
| 700 | |
|---|
| 701 | def _moveCallLaterSooner(self, tple): |
|---|
| 702 | |
|---|
| 703 | heap = self._pendingTimedCalls |
|---|
| 704 | try: |
|---|
| 705 | pos = heap.index(tple) |
|---|
| 706 | |
|---|
| 707 | |
|---|
| 708 | elt = heap[pos] |
|---|
| 709 | while pos != 0: |
|---|
| 710 | parent = (pos-1) // 2 |
|---|
| 711 | if heap[parent] <= elt: |
|---|
| 712 | break |
|---|
| 713 | |
|---|
| 714 | heap[pos] = heap[parent] |
|---|
| 715 | pos = parent |
|---|
| 716 | heap[pos] = elt |
|---|
| 717 | except ValueError: |
|---|
| 718 | |
|---|
| 719 | pass |
|---|
| 720 | |
|---|
| 721 | def _cancelCallLater(self, tple): |
|---|
| 722 | self._cancellations+=1 |
|---|
| 723 | |
|---|
| 724 | |
|---|
| 725 | def getDelayedCalls(self): |
|---|
| 726 | """Return all the outstanding delayed calls in the system. |
|---|
| 727 | They are returned in no particular order. |
|---|
| 728 | This method is not efficient -- it is really only meant for |
|---|
| 729 | test cases.""" |
|---|
| 730 | return [x for x in (self._pendingTimedCalls + self._newTimedCalls) if not x.cancelled] |
|---|
| 731 | |
|---|
| 732 | def _insertNewDelayedCalls(self): |
|---|
| 733 | for call in self._newTimedCalls: |
|---|
| 734 | if call.cancelled: |
|---|
| 735 | self._cancellations-=1 |
|---|
| 736 | else: |
|---|
| 737 | call.activate_delay() |
|---|
| 738 | heappush(self._pendingTimedCalls, call) |
|---|
| 739 | self._newTimedCalls = [] |
|---|
| 740 | |
|---|
| 741 | def timeout(self): |
|---|
| 742 | |
|---|
| 743 | self._insertNewDelayedCalls() |
|---|
| 744 | |
|---|
| 745 | if not self._pendingTimedCalls: |
|---|
| 746 | return None |
|---|
| 747 | |
|---|
| 748 | return max(0, self._pendingTimedCalls[0].time - self.seconds()) |
|---|
| 749 | |
|---|
| 750 | |
|---|
| 751 | def runUntilCurrent(self): |
|---|
| 752 | """Run all pending timed calls. |
|---|
| 753 | """ |
|---|
| 754 | if self.threadCallQueue: |
|---|
| 755 | |
|---|
| 756 | |
|---|
| 757 | |
|---|
| 758 | count = 0 |
|---|
| 759 | total = len(self.threadCallQueue) |
|---|
| 760 | for (f, a, kw) in self.threadCallQueue: |
|---|
| 761 | try: |
|---|
| 762 | f(*a, **kw) |
|---|
| 763 | except: |
|---|
| 764 | log.err() |
|---|
| 765 | count += 1 |
|---|
| 766 | if count == total: |
|---|
| 767 | break |
|---|
| 768 | del self.threadCallQueue[:count] |
|---|
| 769 | if self.threadCallQueue: |
|---|
| 770 | self.wakeUp() |
|---|
| 771 | |
|---|
| 772 | |
|---|
| 773 | self._insertNewDelayedCalls() |
|---|
| 774 | |
|---|
| 775 | now = self.seconds() |
|---|
| 776 | while self._pendingTimedCalls and (self._pendingTimedCalls[0].time <= now): |
|---|
| 777 | call = heappop(self._pendingTimedCalls) |
|---|
| 778 | if call.cancelled: |
|---|
| 779 | self._cancellations-=1 |
|---|
| 780 | continue |
|---|
| 781 | |
|---|
| 782 | if call.delayed_time > 0: |
|---|
| 783 | call.activate_delay() |
|---|
| 784 | heappush(self._pendingTimedCalls, call) |
|---|
| 785 | continue |
|---|
| 786 | |
|---|
| 787 | try: |
|---|
| 788 | call.called = 1 |
|---|
| 789 | call.func(*call.args, **call.kw) |
|---|
| 790 | except: |
|---|
| 791 | log.deferr() |
|---|
| 792 | if hasattr(call, "creator"): |
|---|
| 793 | e = "\n" |
|---|
| 794 | e += " C: previous exception occurred in " + \ |
|---|
| 795 | "a DelayedCall created here:\n" |
|---|
| 796 | e += " C:" |
|---|
| 797 | e += "".join(call.creator).rstrip().replace("\n","\n C:") |
|---|
| 798 | e += "\n" |
|---|
| 799 | log.msg(e) |
|---|
| 800 | |
|---|
| 801 | |
|---|
| 802 | if (self._cancellations > 50 and |
|---|
| 803 | self._cancellations > len(self._pendingTimedCalls) >> 1): |
|---|
| 804 | self._cancellations = 0 |
|---|
| 805 | self._pendingTimedCalls = [x for x in self._pendingTimedCalls |
|---|
| 806 | if not x.cancelled] |
|---|
| 807 | heapify(self._pendingTimedCalls) |
|---|
| 808 | |
|---|
| 809 | if self._justStopped: |
|---|
| 810 | self._justStopped = False |
|---|
| 811 | self.fireSystemEvent("shutdown") |
|---|
| 812 | |
|---|
| 813 | |
|---|
| 814 | |
|---|
| 815 | def _checkProcessArgs(self, args, env): |
|---|
| 816 | """ |
|---|
| 817 | Check for valid arguments and environment to spawnProcess. |
|---|
| 818 | |
|---|
| 819 | @return: A two element tuple giving values to use when creating the |
|---|
| 820 | process. The first element of the tuple is a C{list} of C{str} |
|---|
| 821 | giving the values for argv of the child process. The second element |
|---|
| 822 | of the tuple is either C{None} if C{env} was C{None} or a C{dict} |
|---|
| 823 | mapping C{str} environment keys to C{str} environment values. |
|---|
| 824 | """ |
|---|
| 825 | |
|---|
| 826 | |
|---|
| 827 | |
|---|
| 828 | |
|---|
| 829 | |
|---|
| 830 | |
|---|
| 831 | |
|---|
| 832 | |
|---|
| 833 | |
|---|
| 834 | |
|---|
| 835 | |
|---|
| 836 | |
|---|
| 837 | |
|---|
| 838 | |
|---|
| 839 | |
|---|
| 840 | |
|---|
| 841 | |
|---|
| 842 | defaultEncoding = sys.getdefaultencoding() |
|---|
| 843 | |
|---|
| 844 | |
|---|
| 845 | def argChecker(arg): |
|---|
| 846 | """ |
|---|
| 847 | Return either a str or None. If the given value is not |
|---|
| 848 | allowable for some reason, None is returned. Otherwise, a |
|---|
| 849 | possibly different object which should be used in place of arg |
|---|
| 850 | is returned. This forces unicode encoding to happen now, rather |
|---|
| 851 | than implicitly later. |
|---|
| 852 | """ |
|---|
| 853 | if isinstance(arg, unicode): |
|---|
| 854 | try: |
|---|
| 855 | arg = arg.encode(defaultEncoding) |
|---|
| 856 | except UnicodeEncodeError: |
|---|
| 857 | return None |
|---|
| 858 | warnings.warn( |
|---|
| 859 | "Argument strings and environment keys/values passed to " |
|---|
| 860 | "reactor.spawnProcess should be str, not unicode.", |
|---|
| 861 | category=DeprecationWarning, |
|---|
| 862 | stacklevel=4) |
|---|
| 863 | if isinstance(arg, str) and '\0' not in arg: |
|---|
| 864 | return arg |
|---|
| 865 | return None |
|---|
| 866 | |
|---|
| 867 | |
|---|
| 868 | if not isinstance(args, (tuple, list)): |
|---|
| 869 | raise TypeError("Arguments must be a tuple or list") |
|---|
| 870 | |
|---|
| 871 | outputArgs = [] |
|---|
| 872 | for arg in args: |
|---|
| 873 | arg = argChecker(arg) |
|---|
| 874 | if arg is None: |
|---|
| 875 | raise TypeError("Arguments contain a non-string value") |
|---|
| 876 | else: |
|---|
| 877 | outputArgs.append(arg) |
|---|
| 878 | |
|---|
| 879 | outputEnv = None |
|---|
| 880 | if env is not None: |
|---|
| 881 | outputEnv = {} |
|---|
| 882 | for key, val in env.iteritems(): |
|---|
| 883 | key = argChecker(key) |
|---|
| 884 | if key is None: |
|---|
| 885 | raise TypeError("Environment contains a non-string key") |
|---|
| 886 | val = argChecker(val) |
|---|
| 887 | if val is None: |
|---|
| 888 | raise TypeError("Environment contains a non-string value") |
|---|
| 889 | outputEnv[key] = val |
|---|
| 890 | return outputArgs, outputEnv |
|---|
| 891 | |
|---|
| 892 | |
|---|
| 893 | if platform.supportsThreads(): |
|---|
| 894 | threadpool = None |
|---|
| 895 | |
|---|
| 896 | _threadpoolStartupID = None |
|---|
| 897 | |
|---|
| 898 | threadpoolShutdownID = None |
|---|
| 899 | |
|---|
| 900 | def _initThreads(self): |
|---|
| 901 | self.usingThreads = True |
|---|
| 902 | self.resolver = ThreadedResolver(self) |
|---|
| 903 | |
|---|
| 904 | def callFromThread(self, f, *args, **kw): |
|---|
| 905 | """ |
|---|
| 906 | See L{twisted.internet.interfaces.IReactorThreads.callFromThread}. |
|---|
| 907 | """ |
|---|
| 908 | assert callable(f), "%s is not callable" % (f,) |
|---|
| 909 | |
|---|
| 910 | |
|---|
| 911 | |
|---|
| 912 | self.threadCallQueue.append((f, args, kw)) |
|---|
| 913 | self.wakeUp() |
|---|
| 914 | |
|---|
| 915 | def _initThreadPool(self): |
|---|
| 916 | """ |
|---|
| 917 | Create the threadpool accessible with callFromThread. |
|---|
| 918 | """ |
|---|
| 919 | from twisted.python import threadpool |
|---|
| 920 | self.threadpool = threadpool.ThreadPool( |
|---|
| 921 | 0, 10, 'twisted.internet.reactor') |
|---|
| 922 | self._threadpoolStartupID = self.callWhenRunning( |
|---|
| 923 | self.threadpool.start) |
|---|
| 924 | self.threadpoolShutdownID = self.addSystemEventTrigger( |
|---|
| 925 | 'during', 'shutdown', self._stopThreadPool) |
|---|
| 926 | |
|---|
| 927 | def _uninstallHandler(self): |
|---|
| 928 | pass |
|---|
| 929 | |
|---|
| 930 | def _stopThreadPool(self): |
|---|
| 931 | """ |
|---|
| 932 | Stop the reactor threadpool. This method is only valid if there |
|---|
| 933 | is currently a threadpool (created by L{_initThreadPool}). It |
|---|
| 934 | is not intended to be called directly; instead, it will be |
|---|
| 935 | called by a shutdown trigger created in L{_initThreadPool}. |
|---|
| 936 | """ |
|---|
| 937 | triggers = [self._threadpoolStartupID, self.threadpoolShutdownID] |
|---|
| 938 | for trigger in filter(None, triggers): |
|---|
| 939 | try: |
|---|
| 940 | self.removeSystemEventTrigger(trigger) |
|---|
| 941 | except ValueError: |
|---|
| 942 | pass |
|---|
| 943 | self._threadpoolStartupID = None |
|---|
| 944 | self.threadpoolShutdownID = None |
|---|
| 945 | self.threadpool.stop() |
|---|
| 946 | self.threadpool = None |
|---|
| 947 | |
|---|
| 948 | |
|---|
| 949 | def getThreadPool(self): |
|---|
| 950 | """ |
|---|
| 951 | See L{twisted.internet.interfaces.IReactorThreads.getThreadPool}. |
|---|
| 952 | """ |
|---|
| 953 | if self.threadpool is None: |
|---|
| 954 | self._initThreadPool() |
|---|
| 955 | return self.threadpool |
|---|
| 956 | |
|---|
| 957 | |
|---|
| 958 | def callInThread(self, _callable, *args, **kwargs): |
|---|
| 959 | """ |
|---|
| 960 | See L{twisted.internet.interfaces.IReactorThreads.callInThread}. |
|---|
| 961 | """ |
|---|
| 962 | self.getThreadPool().callInThread(_callable, *args, **kwargs) |
|---|
| 963 | |
|---|
| 964 | def suggestThreadPoolSize(self, size): |
|---|
| 965 | """ |
|---|
| 966 | See L{twisted.internet.interfaces.IReactorThreads.suggestThreadPoolSize}. |
|---|
| 967 | """ |
|---|
| 968 | self.getThreadPool().adjustPoolsize(maxthreads=size) |
|---|
| 969 | else: |
|---|
| 970 | |
|---|
| 971 | def callFromThread(self, f, *args, **kw): |
|---|
| 972 | assert callable(f), "%s is not callable" % (f,) |
|---|
| 973 | |
|---|
| 974 | self.threadCallQueue.append((f, args, kw)) |
|---|
| 975 | |
|---|
| 976 | if platform.supportsThreads(): |
|---|
| 977 | classImplements(ReactorBase, IReactorThreads) |
|---|
| 978 | |
|---|
| 979 | |
|---|
| 980 | class BaseConnector(styles.Ephemeral): |
|---|
| 981 | """Basic implementation of connector. |
|---|
| 982 | |
|---|
| 983 | State can be: "connecting", "connected", "disconnected" |
|---|
| 984 | """ |
|---|
| 985 | |
|---|
| 986 | implements(IConnector) |
|---|
| 987 | |
|---|
| 988 | timeoutID = None |
|---|
| 989 | factoryStarted = 0 |
|---|
| 990 | |
|---|
| 991 | def __init__(self, factory, timeout, reactor): |
|---|
| 992 | self.state = "disconnected" |
|---|
| 993 | self.reactor = reactor |
|---|
| 994 | self.factory = factory |
|---|
| 995 | self.timeout = timeout |
|---|
| 996 | |
|---|
| 997 | def disconnect(self): |
|---|
| 998 | """Disconnect whatever our state is.""" |
|---|
| 999 | if self.state == 'connecting': |
|---|
| 1000 | self.stopConnecting() |
|---|
| 1001 | elif self.state == 'connected': |
|---|
| 1002 | self.transport.loseConnection() |
|---|
| 1003 | |
|---|
| 1004 | def connect(self): |
|---|
| 1005 | """Start connection to remote server.""" |
|---|
| 1006 | if self.state != "disconnected": |
|---|
| 1007 | raise RuntimeError, "can't connect in this state" |
|---|
| 1008 | |
|---|
| 1009 | self.state = "connecting" |
|---|
| 1010 | if not self.factoryStarted: |
|---|
| 1011 | self.factory.doStart() |
|---|
| 1012 | self.factoryStarted = 1 |
|---|
| 1013 | self.transport = transport = self._makeTransport() |
|---|
| 1014 | if self.timeout is not None: |
|---|
| 1015 | self.timeoutID = self.reactor.callLater(self.timeout, transport.failIfNotConnected, error.TimeoutError()) |
|---|
| 1016 | self.factory.startedConnecting(self) |
|---|
| 1017 | |
|---|
| 1018 | def stopConnecting(self): |
|---|
| 1019 | """Stop attempting to connect.""" |
|---|
| 1020 | if self.state != "connecting": |
|---|
| 1021 | raise error.NotConnectingError, "we're not trying to connect" |
|---|
| 1022 | |
|---|
| 1023 | self.state = "disconnected" |
|---|
| 1024 | self.transport.failIfNotConnected(error.UserError()) |
|---|
| 1025 | del self.transport |
|---|
| 1026 | |
|---|
| 1027 | def cancelTimeout(self): |
|---|
| 1028 | if self.timeoutID is not None: |
|---|
| 1029 | try: |
|---|
| 1030 | self.timeoutID.cancel() |
|---|
| 1031 | except ValueError: |
|---|
| 1032 | pass |
|---|
| 1033 | del self.timeoutID |
|---|
| 1034 | |
|---|
| 1035 | def buildProtocol(self, addr): |
|---|
| 1036 | self.state = "connected" |
|---|
| 1037 | self.cancelTimeout() |
|---|
| 1038 | return self.factory.buildProtocol(addr) |
|---|
| 1039 | |
|---|
| 1040 | def connectionFailed(self, reason): |
|---|
| 1041 | self.cancelTimeout() |
|---|
| 1042 | self.transport = None |
|---|
| 1043 | self.state = "disconnected" |
|---|
| 1044 | self.factory.clientConnectionFailed(self, reason) |
|---|
| 1045 | if self.state == "disconnected": |
|---|
| 1046 | |
|---|
| 1047 | self.factory.doStop() |
|---|
| 1048 | self.factoryStarted = 0 |
|---|
| 1049 | |
|---|
| 1050 | def connectionLost(self, reason): |
|---|
| 1051 | self.state = "disconnected" |
|---|
| 1052 | self.factory.clientConnectionLost(self, reason) |
|---|
| 1053 | if self.state == "disconnected": |
|---|
| 1054 | |
|---|
| 1055 | self.factory.doStop() |
|---|
| 1056 | self.factoryStarted = 0 |
|---|
| 1057 | |
|---|
| 1058 | def getDestination(self): |
|---|
| 1059 | raise NotImplementedError( |
|---|
| 1060 | reflect.qual(self.__class__) + " did not implement " |
|---|
| 1061 | "getDestination") |
|---|
| 1062 | |
|---|
| 1063 | |
|---|
| 1064 | |
|---|
| 1065 | class BasePort(abstract.FileDescriptor): |
|---|
| 1066 | """Basic implementation of a ListeningPort. |
|---|
| 1067 | |
|---|
| 1068 | Note: This does not actually implement IListeningPort. |
|---|
| 1069 | """ |
|---|
| 1070 | |
|---|
| 1071 | addressFamily = None |
|---|
| 1072 | socketType = None |
|---|
| 1073 | |
|---|
| 1074 | def createInternetSocket(self): |
|---|
| 1075 | s = socket.socket(self.addressFamily, self.socketType) |
|---|
| 1076 | s.setblocking(0) |
|---|
| 1077 | fdesc._setCloseOnExec(s.fileno()) |
|---|
| 1078 | return s |
|---|
| 1079 | |
|---|
| 1080 | |
|---|
| 1081 | def doWrite(self): |
|---|
| 1082 | """Raises a RuntimeError""" |
|---|
| 1083 | raise RuntimeError, "doWrite called on a %s" % reflect.qual(self.__class__) |
|---|
| 1084 | |
|---|
| 1085 | |
|---|
| 1086 | |
|---|
| 1087 | class _SignalReactorMixin(object): |
|---|
| 1088 | """ |
|---|
| 1089 | Private mixin to manage signals: it installs signal handlers at start time, |
|---|
| 1090 | and define run method. |
|---|
| 1091 | |
|---|
| 1092 | It can only be used mixed in with L{ReactorBase}, and has to be defined |
|---|
| 1093 | first in the inheritance (so that method resolution order finds |
|---|
| 1094 | startRunning first). |
|---|
| 1095 | |
|---|
| 1096 | @type _installSignalHandlers: C{bool} |
|---|
| 1097 | @ivar _installSignalHandlers: A flag which indicates whether any signal |
|---|
| 1098 | handlers will be installed during startup. This includes handlers for |
|---|
| 1099 | SIGCHLD to monitor child processes, and SIGINT, SIGTERM, and SIGBREAK |
|---|
| 1100 | to stop the reactor. |
|---|
| 1101 | """ |
|---|
| 1102 | |
|---|
| 1103 | _installSignalHandlers = False |
|---|
| 1104 | |
|---|
| 1105 | def _handleSignals(self): |
|---|
| 1106 | """ |
|---|
| 1107 | Install the signal handlers for the Twisted event loop. |
|---|
| 1108 | """ |
|---|
| 1109 | try: |
|---|
| 1110 | import signal |
|---|
| 1111 | except ImportError: |
|---|
| 1112 | log.msg("Warning: signal module unavailable -- " |
|---|
| 1113 | "not installing signal handlers.") |
|---|
| 1114 | return |
|---|
| 1115 | |
|---|
| 1116 | if signal.getsignal(signal.SIGINT) == signal.default_int_handler: |
|---|
| 1117 | |
|---|
| 1118 | signal.signal(signal.SIGINT, self.sigInt) |
|---|
| 1119 | signal.signal(signal.SIGTERM, self.sigTerm) |
|---|
| 1120 | |
|---|
| 1121 | |
|---|
| 1122 | if hasattr(signal, "SIGBREAK"): |
|---|
| 1123 | signal.signal(signal.SIGBREAK, self.sigBreak) |
|---|
| 1124 | |
|---|
| 1125 | |
|---|
| 1126 | def startRunning(self, installSignalHandlers=True): |
|---|
| 1127 | """ |
|---|
| 1128 | Extend the base implementation in order to remember whether signal |
|---|
| 1129 | handlers should be installed later. |
|---|
| 1130 | |
|---|
| 1131 | @type installSignalHandlers: C{bool} |
|---|
| 1132 | @param installSignalHandlers: A flag which, if set, indicates that |
|---|
| 1133 | handlers for a number of (implementation-defined) signals should be |
|---|
| 1134 | installed during startup. |
|---|
| 1135 | """ |
|---|
| 1136 | self._installSignalHandlers = installSignalHandlers |
|---|
| 1137 | ReactorBase.startRunning(self) |
|---|
| 1138 | |
|---|
| 1139 | |
|---|
| 1140 | def _reallyStartRunning(self): |
|---|
| 1141 | """ |
|---|
| 1142 | Extend the base implementation by also installing signal handlers, if |
|---|
| 1143 | C{self._installSignalHandlers} is true. |
|---|
| 1144 | """ |
|---|
| 1145 | ReactorBase._reallyStartRunning(self) |
|---|
| 1146 | if self._installSignalHandlers: |
|---|
| 1147 | |
|---|
| 1148 | |
|---|
| 1149 | |
|---|
| 1150 | |
|---|
| 1151 | |
|---|
| 1152 | |
|---|
| 1153 | self._handleSignals() |
|---|
| 1154 | |
|---|
| 1155 | |
|---|
| 1156 | def run(self, installSignalHandlers=True): |
|---|
| 1157 | self.startRunning(installSignalHandlers=installSignalHandlers) |
|---|
| 1158 | self.mainLoop() |
|---|
| 1159 | |
|---|
| 1160 | |
|---|
| 1161 | def mainLoop(self): |
|---|
| 1162 | while self._started: |
|---|
| 1163 | try: |
|---|
| 1164 | while self._started: |
|---|
| 1165 | |
|---|
| 1166 | |
|---|
| 1167 | self.runUntilCurrent() |
|---|
| 1168 | t2 = self.timeout() |
|---|
| 1169 | t = self.running and t2 |
|---|
| 1170 | self.doIteration(t) |
|---|
| 1171 | except: |
|---|
| 1172 | log.msg("Unexpected error in main loop.") |
|---|
| 1173 | log.err() |
|---|
| 1174 | else: |
|---|
| 1175 | log.msg('Main loop terminated.') |
|---|
| 1176 | |
|---|
| 1177 | |
|---|
| 1178 | |
|---|
| 1179 | __all__ = [] |
|---|