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""" Implements a fully blocking kernel client.
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Useful for test suites and blocking terminal interfaces.
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2012 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING.txt, distributed as part of this software.
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#-----------------------------------------------------------------------------
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try:
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from queue import Queue, Empty # Py 3
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except ImportError:
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from Queue import Queue, Empty # Py 2
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# IPython imports
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from IPython.utils.io import raw_print
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from IPython.utils.traitlets import Type
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#from IPython.kernel.blocking.channels import BlockingChannelMixin
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# Local imports
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from .channels import (
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InProcessChannel,
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)
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from .client import InProcessKernelClient
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class BlockingInProcessChannel(InProcessChannel):
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def __init__(self, *args, **kwds):
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super(BlockingInProcessChannel, self).__init__(*args, **kwds)
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self._in_queue = Queue()
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def call_handlers(self, msg):
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self._in_queue.put(msg)
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def get_msg(self, block=True, timeout=None):
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""" Gets a message if there is one that is ready. """
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if timeout is None:
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# Queue.get(timeout=None) has stupid uninteruptible
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# behavior, so wait for a week instead
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timeout = 604800
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return self._in_queue.get(block, timeout)
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def get_msgs(self):
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""" Get all messages that are currently ready. """
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msgs = []
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while True:
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try:
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msgs.append(self.get_msg(block=False))
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except Empty:
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break
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return msgs
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def msg_ready(self):
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""" Is there a message that has been received? """
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return not self._in_queue.empty()
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class BlockingInProcessStdInChannel(BlockingInProcessChannel):
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def call_handlers(self, msg):
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""" Overridden for the in-process channel.
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This methods simply calls raw_input directly.
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"""
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msg_type = msg['header']['msg_type']
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if msg_type == 'input_request':
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_raw_input = self.client.kernel._sys_raw_input
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prompt = msg['content']['prompt']
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raw_print(prompt, end='')
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self.client.input(_raw_input())
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class BlockingInProcessKernelClient(InProcessKernelClient):
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# The classes to use for the various channels.
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shell_channel_class = Type(BlockingInProcessChannel)
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iopub_channel_class = Type(BlockingInProcessChannel)
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stdin_channel_class = Type(BlockingInProcessStdInChannel)
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def wait_for_ready(self):
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# Wait for kernel info reply on shell channel
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while True:
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msg = self.shell_channel.get_msg(block=True)
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if msg['msg_type'] == 'kernel_info_reply':
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self._handle_kernel_info_reply(msg)
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break
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# Flush IOPub channel
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while True:
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try:
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msg = self.iopub_channel.get_msg(block=True, timeout=0.2)
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print(msg['msg_type'])
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except Empty:
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break
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