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import sys
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import time
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import os
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import threading
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import uuid
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from io import StringIO
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import zmq
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from session import extract_header, Message
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from IPython.utils import io, text
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from IPython.utils import py3compat
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import multiprocessing as mp
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# import multiprocessing.sharedctypes as mpshc
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from ctypes import c_bool
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#-----------------------------------------------------------------------------
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# Globals
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#-----------------------------------------------------------------------------
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MASTER_NO_CHILDREN = 0
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MASTER_WITH_CHILDREN = 1
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CHILD = 2
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#-----------------------------------------------------------------------------
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# Stream classes
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#-----------------------------------------------------------------------------
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class OutStream(object):
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"""A file like object that publishes the stream to a 0MQ PUB socket."""
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# The time interval between automatic flushes, in seconds.
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flush_interval = 0.05
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topic=None
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def __init__(self, session, pub_socket, name):
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self.encoding = 'UTF-8'
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self.session = session
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self.pub_socket = pub_socket
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self.name = name
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self.parent_header = {}
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self._new_buffer()
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self._found_newprocess = threading.Event()
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self._buffer_lock = threading.Lock()
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self._master_pid = os.getpid()
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self._master_thread = threading.current_thread().ident
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self._pipe_pid = os.getpid()
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self._setup_pipe_in()
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def _setup_pipe_in(self):
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"""setup listening pipe for subprocesses"""
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ctx = self._pipe_ctx = zmq.Context()
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# signal pair for terminating background thread
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self._pipe_signaler = ctx.socket(zmq.PAIR)
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self._pipe_signalee = ctx.socket(zmq.PAIR)
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self._pipe_signaler.bind("inproc://ostream_pipe")
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self._pipe_signalee.connect("inproc://ostream_pipe")
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# thread event to signal cleanup is done
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self._pipe_done = threading.Event()
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# use UUID to authenticate pipe messages
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self._pipe_uuid = uuid.uuid4().bytes
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self._pipe_thread = threading.Thread(target=self._pipe_main)
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self._pipe_thread.start()
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def _setup_pipe_out(self):
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# must be new context after fork
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ctx = zmq.Context()
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self._pipe_pid = os.getpid()
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self._pipe_out = ctx.socket(zmq.PUSH)
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self._pipe_out_lock = threading.Lock()
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self._pipe_out.connect("tcp://127.0.0.1:%i" % self._pipe_port)
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def _pipe_main(self):
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"""eventloop for receiving"""
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ctx = self._pipe_ctx
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self._pipe_in = ctx.socket(zmq.PULL)
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self._pipe_port = self._pipe_in.bind_to_random_port("tcp://127.0.0.1")
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poller = zmq.Poller()
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poller.register(self._pipe_signalee, zmq.POLLIN)
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poller.register(self._pipe_in, zmq.POLLIN)
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while True:
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if not self._is_master_process():
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return
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try:
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events = dict(poller.poll(1000))
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except zmq.ZMQError:
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# should only be triggered by process-ending cleanup
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return
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if self._pipe_signalee in events:
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break
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if self._pipe_in in events:
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msg = self._pipe_in.recv_multipart()
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if msg[0] != self._pipe_uuid:
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# message not authenticated
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continue
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self._found_newprocess.set()
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text = msg[1].decode(self.encoding, 'replace')
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with self._buffer_lock:
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self._buffer.write(text)
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if self._start < 0:
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self._start = time.time()
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# wrap it up
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self._pipe_signaler.close()
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self._pipe_signalee.close()
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self._pipe_in.close()
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self._pipe_ctx.term()
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self._pipe_done.set()
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def __del__(self):
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if not self._is_master_process():
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return
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self._pipe_signaler.send(b'die')
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self._pipe_done.wait(10)
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def _is_master_process(self):
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return os.getpid() == self._master_pid
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def _is_master_thread(self):
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return threading.current_thread().ident == self._master_thread
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def _have_pipe_out(self):
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return os.getpid() == self._pipe_pid
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def _check_mp_mode(self):
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"""check for forks, and switch to zmq pipeline if necessary"""
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if self._is_master_process():
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if self._found_newprocess.is_set():
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return MASTER_WITH_CHILDREN
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else:
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return MASTER_NO_CHILDREN
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else:
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if not self._have_pipe_out():
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# setup a new out pipe
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self._setup_pipe_out()
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return CHILD
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def set_parent(self, parent):
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self.parent_header = extract_header(parent)
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def close(self):
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self.pub_socket = None
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def flush(self):
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"""trigger actual zmq send"""
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if self.pub_socket is None:
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raise ValueError(u'I/O operation on closed file')
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else:
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if self._is_master_process():
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if not self._is_master_thread():
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# sub-threads mustn't trigger flush,
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# but at least they can force the timer.
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self._start = 0
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data = u''
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# obtain data
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if self._check_mp_mode(): # multiprocess, needs a lock
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with self._buffer_lock:
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data = self._buffer.getvalue()
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self._buffer.close()
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self._new_buffer()
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else: # single process mode
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data = self._buffer.getvalue()
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self._buffer.close()
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self._new_buffer()
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if data:
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content = {u'name':self.name, u'data':data}
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msg = self.session.send(self.pub_socket, u'stream', content=content,
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parent=self.parent_header, ident=self.topic)
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if hasattr(self.pub_socket, 'flush'):
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# socket itself has flush (presumably ZMQStream)
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self.pub_socket.flush()
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else:
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self._check_mp_mode()
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with self._pipe_out_lock:
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tracker = self._pipe_out.send(b'', copy=False, track=True)
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tracker.wait(1)
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def isatty(self):
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return False
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def __next__(self):
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raise IOError('Read not supported on a write only stream.')
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if not py3compat.PY3:
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next = __next__
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def read(self, size=-1):
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raise IOError('Read not supported on a write only stream.')
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def readline(self, size=-1):
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raise IOError('Read not supported on a write only stream.')
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def write(self, string):
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if self.pub_socket is None:
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raise ValueError('I/O operation on closed file')
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else:
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# Make sure that we're handling unicode
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if not isinstance(string, unicode):
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string = string.decode(self.encoding, 'replace')
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mp_mode = self._check_mp_mode()
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if mp_mode == CHILD:
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with self._pipe_out_lock:
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self._pipe_out.send_multipart([
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self._pipe_uuid,
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string.encode(self.encoding, 'replace'),
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])
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return
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elif mp_mode == MASTER_NO_CHILDREN:
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self._buffer.write(string)
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elif mp_mode == MASTER_WITH_CHILDREN:
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with self._buffer_lock:
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self._buffer.write(string)
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current_time = time.time()
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if self._start < 0:
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self._start = current_time
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elif current_time - self._start > self.flush_interval:
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self.flush()
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def writelines(self, sequence):
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if self.pub_socket is None:
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raise ValueError('I/O operation on closed file')
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else:
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for string in sequence:
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self.write(string)
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def _new_buffer(self):
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self._buffer = StringIO()
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self._start = -1
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