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@ -100,7 +100,7 @@ CALL_SERVICE = 110
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#: * a remote receiver is disconnected or explicitly closed.
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#: * a related message could not be delivered due to no route existing for it.
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#: * a router is being torn down, as a sentinel value to notify
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#: :py:meth:`mitogen.core.Router.add_handler` callbacks to clean up.
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#: :meth:`mitogen.core.Router.add_handler` callbacks to clean up.
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IS_DEAD = 999
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try:
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@ -187,7 +187,7 @@ class Error(Exception):
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class LatchError(Error):
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"""Raised when an attempt is made to use a :py:class:`mitogen.core.Latch`
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"""Raised when an attempt is made to use a :class:`mitogen.core.Latch`
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that has been marked closed."""
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pass
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@ -239,7 +239,7 @@ class Kwargs(dict):
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class CallError(Error):
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"""Serializable :class:`Error` subclass raised when
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:py:meth:`Context.call() <mitogen.parent.Context.call>` fails. A copy of
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:meth:`Context.call() <mitogen.parent.Context.call>` fails. A copy of
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the traceback from the external context is appended to the exception
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message."""
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def __init__(self, fmt=None, *args):
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@ -872,6 +872,15 @@ class Receiver(object):
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class Channel(Sender, Receiver):
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"""
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A channel inherits from :class:`mitogen.core.Sender` and
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`mitogen.core.Receiver` to provide bidirectional functionality.
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Since all handles aren't known until after both ends are constructed, for
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both ends to communicate through a channel, it is necessary for one end to
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retrieve the handle allocated to the other and reconfigure its own channel
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to match. Currently this is a manual task.
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"""
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def __init__(self, router, context, dst_handle, handle=None):
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Sender.__init__(self, context, dst_handle)
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Receiver.__init__(self, router, handle)
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@ -1160,12 +1169,35 @@ class LogHandler(logging.Handler):
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class Side(object):
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"""
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Represent a single side of a :class:`BasicStream`. This exists to allow
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streams implemented using unidirectional (e.g. UNIX pipe) and bidirectional
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(e.g. UNIX socket) file descriptors to operate identically.
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:param mitogen.core.Stream stream:
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The stream this side is associated with.
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:param int fd:
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Underlying file descriptor.
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:param bool keep_alive:
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Value for :attr:`keep_alive`
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During construction, the file descriptor has its :data:`os.O_NONBLOCK` flag
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enabled using :func:`fcntl.fcntl`.
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"""
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_fork_refs = weakref.WeakValueDictionary()
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def __init__(self, stream, fd, cloexec=True, keep_alive=True, blocking=False):
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#: The :class:`Stream` for which this is a read or write side.
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self.stream = stream
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#: Integer file descriptor to perform IO on, or :data:`None` if
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#: :meth:`close` has been called.
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self.fd = fd
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self.closed = False
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#: If :data:`True`, causes presence of this side in
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#: :class:`Broker`'s active reader set to defer shutdown until the
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#: side is disconnected.
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self.keep_alive = keep_alive
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self._fork_refs[id(self)] = self
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if cloexec:
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@ -1182,12 +1214,29 @@ class Side(object):
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side.close()
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def close(self):
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"""
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Call :func:`os.close` on :attr:`fd` if it is not :data:`None`,
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then set it to :data:`None`.
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"""
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if not self.closed:
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_vv and IOLOG.debug('%r.close()', self)
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self.closed = True
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os.close(self.fd)
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def read(self, n=CHUNK_SIZE):
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"""
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Read up to `n` bytes from the file descriptor, wrapping the underlying
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:func:`os.read` call with :func:`io_op` to trap common disconnection
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conditions.
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:meth:`read` always behaves as if it is reading from a regular UNIX
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file; socket, pipe, and TTY disconnection errors are masked and result
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in a 0-sized read like a regular file.
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:returns:
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Bytes read, or the empty to string to indicate disconnection was
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detected.
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"""
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if self.closed:
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# Refuse to touch the handle after closed, it may have been reused
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# by another thread. TODO: synchronize read()/write()/close().
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@ -1198,6 +1247,15 @@ class Side(object):
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return s
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def write(self, s):
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"""
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Write as much of the bytes from `s` as possible to the file descriptor,
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wrapping the underlying :func:`os.write` call with :func:`io_op` to
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trap common disconnection connditions.
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:returns:
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Number of bytes written, or :data:`None` if disconnection was
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detected.
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"""
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if self.closed or self.fd is None:
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# Refuse to touch the handle after closed, it may have been reused
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# by another thread.
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@ -1210,10 +1268,50 @@ class Side(object):
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class BasicStream(object):
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#: A :class:`Side` representing the stream's receive file descriptor.
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receive_side = None
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#: A :class:`Side` representing the stream's transmit file descriptor.
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transmit_side = None
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def on_receive(self, broker):
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"""
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Called by :class:`Broker` when the stream's :attr:`receive_side` has
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been marked readable using :meth:`Broker.start_receive` and the broker
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has detected the associated file descriptor is ready for reading.
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Subclasses must implement this if :meth:`Broker.start_receive` is ever
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called on them, and the method must call :meth:`on_disconect` if
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reading produces an empty string.
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"""
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def on_transmit(self, broker):
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"""
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Called by :class:`Broker` when the stream's :attr:`transmit_side`
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has been marked writeable using :meth:`Broker._start_transmit` and
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the broker has detected the associated file descriptor is ready for
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writing.
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Subclasses must implement this if :meth:`Broker._start_transmit` is
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ever called on them.
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"""
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def on_shutdown(self, broker):
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"""
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Called by :meth:`Broker.shutdown` to allow the stream time to
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gracefully shutdown. The base implementation simply called
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:meth:`on_disconnect`.
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"""
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_v and LOG.debug('%r.on_shutdown()', self)
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fire(self, 'shutdown')
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self.on_disconnect(broker)
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def on_disconnect(self, broker):
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"""
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Called by :class:`Broker` to force disconnect the stream. The base
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implementation simply closes :attr:`receive_side` and
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:attr:`transmit_side` and unregisters the stream from the broker.
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"""
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LOG.debug('%r.on_disconnect()', self)
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if self.receive_side:
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broker.stop_receive(self)
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@ -1223,19 +1321,14 @@ class BasicStream(object):
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self.transmit_side.close()
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fire(self, 'disconnect')
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def on_shutdown(self, broker):
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_v and LOG.debug('%r.on_shutdown()', self)
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fire(self, 'shutdown')
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self.on_disconnect(broker)
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class Stream(BasicStream):
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"""
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:py:class:`BasicStream` subclass implementing mitogen's :ref:`stream
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:class:`BasicStream` subclass implementing mitogen's :ref:`stream
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protocol <stream-protocol>`.
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"""
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#: If not :data:`None`, :py:class:`Router` stamps this into
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#: :py:attr:`Message.auth_id` of every message received on this stream.
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#: If not :data:`None`, :class:`Router` stamps this into
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#: :attr:`Message.auth_id` of every message received on this stream.
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auth_id = None
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#: If not :data:`False`, indicates the stream has :attr:`auth_id` set and
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@ -1272,7 +1365,7 @@ class Stream(BasicStream):
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def on_receive(self, broker):
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"""Handle the next complete message on the stream. Raise
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:py:class:`StreamError` on failure."""
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:class:`StreamError` on failure."""
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_vv and IOLOG.debug('%r.on_receive()', self)
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buf = self.receive_side.read()
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@ -1329,6 +1422,14 @@ class Stream(BasicStream):
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return True
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def pending_bytes(self):
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"""
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Return the number of bytes queued for transmission on this stream. This
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can be used to limit the amount of data buffered in RAM by an otherwise
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unlimited consumer.
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For an accurate result, this method should be called from the Broker
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thread, for example by using :meth:`Broker.defer_sync`.
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"""
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return self._output_buf_len
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def on_transmit(self, broker):
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@ -1572,15 +1673,15 @@ class Poller(object):
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class Latch(object):
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"""
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A latch is a :py:class:`Queue.Queue`-like object that supports mutation and
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waiting from multiple threads, however unlike :py:class:`Queue.Queue`,
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A latch is a :class:`Queue.Queue`-like object that supports mutation and
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waiting from multiple threads, however unlike :class:`Queue.Queue`,
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waiting threads always remain interruptible, so CTRL+C always succeeds, and
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waits where a timeout is set experience no wake up latency. These
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properties are not possible in combination using the built-in threading
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primitives available in Python 2.x.
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Latches implement queues using the UNIX self-pipe trick, and a per-thread
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:py:func:`socket.socketpair` that is lazily created the first time any
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:func:`socket.socketpair` that is lazily created the first time any
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latch attempts to sleep on a thread, and dynamically associated with the
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waiting Latch only for duration of the wait.
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@ -1626,7 +1727,7 @@ class Latch(object):
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def close(self):
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"""
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Mark the latch as closed, and cause every sleeping thread to be woken,
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with :py:class:`mitogen.core.LatchError` raised in each thread.
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with :class:`mitogen.core.LatchError` raised in each thread.
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"""
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self._lock.acquire()
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try:
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@ -1640,17 +1741,17 @@ class Latch(object):
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def empty(self):
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"""
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Return :py:data:`True` if calling :py:meth:`get` would block.
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Return :data:`True` if calling :meth:`get` would block.
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As with :py:class:`Queue.Queue`, :py:data:`True` may be returned even
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though a subsequent call to :py:meth:`get` will succeed, since a
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message may be posted at any moment between :py:meth:`empty` and
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:py:meth:`get`.
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As with :class:`Queue.Queue`, :data:`True` may be returned even
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though a subsequent call to :meth:`get` will succeed, since a
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message may be posted at any moment between :meth:`empty` and
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:meth:`get`.
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As with :py:class:`Queue.Queue`, :py:data:`False` may be returned even
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though a subsequent call to :py:meth:`get` will block, since another
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waiting thread may be woken at any moment between :py:meth:`empty` and
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:py:meth:`get`.
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As with :class:`Queue.Queue`, :data:`False` may be returned even
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though a subsequent call to :meth:`get` will block, since another
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waiting thread may be woken at any moment between :meth:`empty` and
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:meth:`get`.
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"""
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return len(self._queue) == 0
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|
@ -1683,14 +1784,14 @@ class Latch(object):
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Return the next enqueued object, or sleep waiting for one.
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|
:param float timeout:
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If not :py:data:`None`, specifies a timeout in seconds.
|
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If not :data:`None`, specifies a timeout in seconds.
|
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:param bool block:
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If :py:data:`False`, immediately raise
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|
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:py:class:`mitogen.core.TimeoutError` if the latch is empty.
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If :data:`False`, immediately raise
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:class:`mitogen.core.TimeoutError` if the latch is empty.
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|
|
:raises mitogen.core.LatchError:
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:py:meth:`close` has been called, and the object is no longer valid.
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:meth:`close` has been called, and the object is no longer valid.
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|
|
:raises mitogen.core.TimeoutError:
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Timeout was reached.
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|
@ -1771,7 +1872,7 @@ class Latch(object):
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exists.
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|
:raises mitogen.core.LatchError:
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|
:py:meth:`close` has been called, and the object is no longer valid.
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:meth:`close` has been called, and the object is no longer valid.
|
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|
"""
|
|
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|
|
_vv and IOLOG.debug('%r.put(%r)', self, obj)
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|
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|
|
self._lock.acquire()
|
|
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|
|
@ -1807,7 +1908,7 @@ class Latch(object):
|
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|
|
|
|
|
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|
|
class Waker(BasicStream):
|
|
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|
|
"""
|
|
|
|
|
:py:class:`BasicStream` subclass implementing the `UNIX self-pipe trick`_.
|
|
|
|
|
:class:`BasicStream` subclass implementing the `UNIX self-pipe trick`_.
|
|
|
|
|
Used to wake the multiplexer when another thread needs to modify its state
|
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(via a cross-thread function call).
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@ -1893,8 +1994,8 @@ class Waker(BasicStream):
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class IoLogger(BasicStream):
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"""
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:py:class:`BasicStream` subclass that sets up redirection of a standard
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UNIX file descriptor back into the Python :py:mod:`logging` package.
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:class:`BasicStream` subclass that sets up redirection of a standard
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UNIX file descriptor back into the Python :mod:`logging` package.
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"""
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_buf = ''
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@ -2126,8 +2227,8 @@ class Router(object):
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return handle
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def on_shutdown(self, broker):
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"""Called during :py:meth:`Broker.shutdown`, informs callbacks
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registered with :py:meth:`add_handle_cb` the connection is dead."""
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"""Called during :meth:`Broker.shutdown`, informs callbacks registered
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with :meth:`add_handle_cb` the connection is dead."""
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_v and LOG.debug('%r.on_shutdown(%r)', self, broker)
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fire(self, 'shutdown')
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for handle, (persist, fn) in self._handle_map.iteritems():
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@ -2249,14 +2350,26 @@ class Router(object):
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class Broker(object):
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"""
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Responsible for handling I/O multiplexing in a private thread.
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**Note:** This is the somewhat limited core version of the Broker class
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used by child contexts. The master subclass is documented below.
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"""
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poller_class = Poller
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_waker = None
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_thread = None
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#: Seconds grace to allow :class:`streams <Stream>` to shutdown gracefully
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#: before force-disconnecting them during :meth:`shutdown`.
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shutdown_timeout = 3.0
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def __init__(self, poller_class=None):
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self._alive = True
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self._waker = Waker(self)
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#: Arrange for `func(\*args, \**kwargs)` to be executed on the broker
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#: thread, or immediately if the current thread is the broker thread.
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#: Safe to call from any thread.
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self.defer = self._waker.defer
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self.poller = self.poller_class()
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self.poller.start_receive(
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@ -2272,6 +2385,12 @@ class Broker(object):
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self._waker.broker_ident = self._thread.ident
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def start_receive(self, stream):
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"""
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Mark the :attr:`receive_side <Stream.receive_side>` on `stream` as
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ready for reading. Safe to call from any thread. When the associated
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file descriptor becomes ready for reading,
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:meth:`BasicStream.on_receive` will be called.
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"""
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_vv and IOLOG.debug('%r.start_receive(%r)', self, stream)
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side = stream.receive_side
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assert side and side.fd is not None
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@ -2279,26 +2398,47 @@ class Broker(object):
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side.fd, (side, stream.on_receive))
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def stop_receive(self, stream):
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"""
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Mark the :attr:`receive_side <Stream.receive_side>` on `stream` as not
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ready for reading. Safe to call from any thread.
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"""
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_vv and IOLOG.debug('%r.stop_receive(%r)', self, stream)
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self.defer(self.poller.stop_receive, stream.receive_side.fd)
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def _start_transmit(self, stream):
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"""
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Mark the :attr:`transmit_side <Stream.transmit_side>` on `stream` as
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ready for writing. Must only be called from the Broker thread. When the
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associated file descriptor becomes ready for writing,
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:meth:`BasicStream.on_transmit` will be called.
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"""
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_vv and IOLOG.debug('%r._start_transmit(%r)', self, stream)
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side = stream.transmit_side
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assert side and side.fd is not None
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self.poller.start_transmit(side.fd, (side, stream.on_transmit))
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def _stop_transmit(self, stream):
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"""
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Mark the :attr:`transmit_side <Stream.receive_side>` on `stream` as not
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ready for writing.
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"""
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_vv and IOLOG.debug('%r._stop_transmit(%r)', self, stream)
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self.poller.stop_transmit(stream.transmit_side.fd)
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def keep_alive(self):
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"""
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Return :data:`True` if any reader's :attr:`Side.keep_alive` attribute
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is :data:`True`, or any :class:`Context` is still registered that is
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not the master. Used to delay shutdown while some important work is in
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progress (e.g. log draining).
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"""
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it = (side.keep_alive for (_, (side, _)) in self.poller.readers)
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return sum(it, 0)
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def defer_sync(self, func):
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"""
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Block the calling thread while `func` runs on a broker thread.
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Arrange for `func()` to execute on the broker thread, blocking the
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current thread until a result or exception is available.
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:returns:
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Return value of `func()`.
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@ -2349,6 +2489,12 @@ class Broker(object):
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side.stream.on_disconnect(self)
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def _broker_main(self):
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"""
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Handle events until :meth:`shutdown`. On shutdown, invoke
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:meth:`Stream.on_shutdown` for every active stream, then allow up to
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:attr:`shutdown_timeout` seconds for the streams to unregister
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themselves before forcefully calling :meth:`Stream.on_disconnect`.
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"""
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try:
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while self._alive:
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self._loop_once()
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@ -2361,12 +2507,20 @@ class Broker(object):
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fire(self, 'exit')
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def shutdown(self):
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"""
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Request broker gracefully disconnect streams and stop. Safe to call
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from any thread.
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"""
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_v and LOG.debug('%r.shutdown()', self)
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def _shutdown():
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self._alive = False
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self.defer(_shutdown)
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def join(self):
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"""
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Wait for the broker to stop, expected to be called after
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:meth:`shutdown`.
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"""
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self._thread.join()
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def __repr__(self):
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@ -2438,6 +2592,34 @@ class Dispatcher(object):
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class ExternalContext(object):
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"""
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External context implementation.
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.. attribute:: broker
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The :class:`mitogen.core.Broker` instance.
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.. attribute:: context
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The :class:`mitogen.core.Context` instance.
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.. attribute:: channel
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The :class:`mitogen.core.Channel` over which :data:`CALL_FUNCTION`
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requests are received.
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.. attribute:: stdout_log
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The :class:`mitogen.core.IoLogger` connected to ``stdout``.
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.. attribute:: importer
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The :class:`mitogen.core.Importer` instance.
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.. attribute:: stdout_log
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The :class:`IoLogger` connected to ``stdout``.
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.. attribute:: stderr_log
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The :class:`IoLogger` connected to ``stderr``.
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.. method:: _dispatch_calls
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Implementation for the main thread in every child context.
|
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"""
|
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detached = False
|
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def __init__(self, config):
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David Wilson
6 years ago