340 lines
12 KiB
Python
340 lines
12 KiB
Python
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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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# Copyright (c) Jupyter Development Team.
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# Distributed under the terms of the Modified BSD License.
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from functools import partial
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from getpass import getpass
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from queue import Empty
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import sys
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import time
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import zmq
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from time import monotonic
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from traitlets import Type
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from jupyter_client.channels import HBChannel
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from jupyter_client.client import KernelClient
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from .channels import ZMQSocketChannel
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def reqrep(meth, channel='shell'):
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def wrapped(self, *args, **kwargs):
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reply = kwargs.pop('reply', False)
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timeout = kwargs.pop('timeout', None)
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msg_id = meth(self, *args, **kwargs)
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if not reply:
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return msg_id
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return self._recv_reply(msg_id, timeout=timeout, channel=channel)
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if not meth.__doc__:
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# python -OO removes docstrings,
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# so don't bother building the wrapped docstring
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return wrapped
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basedoc, _ = meth.__doc__.split('Returns\n', 1)
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parts = [basedoc.strip()]
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if 'Parameters' not in basedoc:
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parts.append("""
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Parameters
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----------
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""")
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parts.append("""
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reply: bool (default: False)
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Whether to wait for and return reply
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timeout: float or None (default: None)
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Timeout to use when waiting for a reply
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Returns
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-------
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msg_id: str
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The msg_id of the request sent, if reply=False (default)
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reply: dict
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The reply message for this request, if reply=True
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""")
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wrapped.__doc__ = '\n'.join(parts)
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return wrapped
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class BlockingKernelClient(KernelClient):
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"""A KernelClient with blocking APIs
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``get_[channel]_msg()`` methods wait for and return messages on channels,
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raising :exc:`queue.Empty` if no message arrives within ``timeout`` seconds.
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"""
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def wait_for_ready(self, timeout=None):
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"""Waits for a response when a client is blocked
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- Sets future time for timeout
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- Blocks on shell channel until a message is received
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- Exit if the kernel has died
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- If client times out before receiving a message from the kernel, send RuntimeError
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- Flush the IOPub channel
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"""
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if timeout is None:
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abs_timeout = float('inf')
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else:
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abs_timeout = time.time() + timeout
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from ..manager import KernelManager
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if not isinstance(self.parent, KernelManager):
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# This Client was not created by a KernelManager,
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# so wait for kernel to become responsive to heartbeats
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# before checking for kernel_info reply
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while not self.is_alive():
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if time.time() > abs_timeout:
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raise RuntimeError("Kernel didn't respond to heartbeats in %d seconds and timed out" % timeout)
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time.sleep(0.2)
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# Wait for kernel info reply on shell channel
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while True:
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try:
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msg = self.shell_channel.get_msg(block=True, timeout=1)
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except Empty:
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pass
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else:
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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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if not self.is_alive():
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raise RuntimeError('Kernel died before replying to kernel_info')
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# Check if current time is ready check time plus timeout
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if time.time() > abs_timeout:
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raise RuntimeError("Kernel didn't respond in %d seconds" % timeout)
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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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except Empty:
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break
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# The classes to use for the various channels
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shell_channel_class = Type(ZMQSocketChannel)
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iopub_channel_class = Type(ZMQSocketChannel)
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stdin_channel_class = Type(ZMQSocketChannel)
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hb_channel_class = Type(HBChannel)
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control_channel_class = Type(ZMQSocketChannel)
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def _recv_reply(self, msg_id, timeout=None, channel='shell'):
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"""Receive and return the reply for a given request"""
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if timeout is not None:
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deadline = monotonic() + timeout
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while True:
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if timeout is not None:
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timeout = max(0, deadline - monotonic())
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try:
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if channel == 'control':
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reply = self.get_control_msg(timeout=timeout)
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else:
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reply = self.get_shell_msg(timeout=timeout)
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except Empty:
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raise TimeoutError("Timeout waiting for reply")
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if reply['parent_header'].get('msg_id') != msg_id:
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# not my reply, someone may have forgotten to retrieve theirs
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continue
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return reply
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# replies come on the shell channel
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execute = reqrep(KernelClient.execute)
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history = reqrep(KernelClient.history)
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complete = reqrep(KernelClient.complete)
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inspect = reqrep(KernelClient.inspect)
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kernel_info = reqrep(KernelClient.kernel_info)
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comm_info = reqrep(KernelClient.comm_info)
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# replies come on the control channel
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shutdown = reqrep(KernelClient.shutdown, channel='control')
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def _stdin_hook_default(self, msg):
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"""Handle an input request"""
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content = msg['content']
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if content.get('password', False):
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prompt = getpass
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elif sys.version_info < (3,):
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prompt = raw_input
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else:
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prompt = input
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try:
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raw_data = prompt(content["prompt"])
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except EOFError:
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# turn EOFError into EOF character
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raw_data = '\x04'
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except KeyboardInterrupt:
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sys.stdout.write('\n')
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return
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# only send stdin reply if there *was not* another request
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# or execution finished while we were reading.
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if not (self.stdin_channel.msg_ready() or self.shell_channel.msg_ready()):
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self.input(raw_data)
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def _output_hook_default(self, msg):
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"""Default hook for redisplaying plain-text output"""
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msg_type = msg['header']['msg_type']
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content = msg['content']
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if msg_type == 'stream':
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stream = getattr(sys, content['name'])
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stream.write(content['text'])
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elif msg_type in ('display_data', 'execute_result'):
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sys.stdout.write(content['data'].get('text/plain', ''))
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elif msg_type == 'error':
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print('\n'.join(content['traceback']), file=sys.stderr)
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def _output_hook_kernel(self, session, socket, parent_header, msg):
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"""Output hook when running inside an IPython kernel
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adds rich output support.
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"""
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msg_type = msg['header']['msg_type']
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if msg_type in ('display_data', 'execute_result', 'error'):
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session.send(socket, msg_type, msg['content'], parent=parent_header)
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else:
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self._output_hook_default(msg)
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def execute_interactive(self, code, silent=False, store_history=True,
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user_expressions=None, allow_stdin=None, stop_on_error=True,
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timeout=None, output_hook=None, stdin_hook=None,
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):
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"""Execute code in the kernel interactively
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Output will be redisplayed, and stdin prompts will be relayed as well.
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If an IPython kernel is detected, rich output will be displayed.
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You can pass a custom output_hook callable that will be called
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with every IOPub message that is produced instead of the default redisplay.
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.. versionadded:: 5.0
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Parameters
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----------
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code : str
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A string of code in the kernel's language.
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silent : bool, optional (default False)
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If set, the kernel will execute the code as quietly possible, and
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will force store_history to be False.
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store_history : bool, optional (default True)
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If set, the kernel will store command history. This is forced
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to be False if silent is True.
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user_expressions : dict, optional
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A dict mapping names to expressions to be evaluated in the user's
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dict. The expression values are returned as strings formatted using
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:func:`repr`.
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allow_stdin : bool, optional (default self.allow_stdin)
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Flag for whether the kernel can send stdin requests to frontends.
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Some frontends (e.g. the Notebook) do not support stdin requests.
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If raw_input is called from code executed from such a frontend, a
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StdinNotImplementedError will be raised.
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stop_on_error: bool, optional (default True)
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Flag whether to abort the execution queue, if an exception is encountered.
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timeout: float or None (default: None)
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Timeout to use when waiting for a reply
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output_hook: callable(msg)
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Function to be called with output messages.
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If not specified, output will be redisplayed.
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stdin_hook: callable(msg)
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Function to be called with stdin_request messages.
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If not specified, input/getpass will be called.
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Returns
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-------
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reply: dict
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The reply message for this request
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"""
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if not self.iopub_channel.is_alive():
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raise RuntimeError("IOPub channel must be running to receive output")
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if allow_stdin is None:
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allow_stdin = self.allow_stdin
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if allow_stdin and not self.stdin_channel.is_alive():
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raise RuntimeError("stdin channel must be running to allow input")
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msg_id = self.execute(code,
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silent=silent,
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store_history=store_history,
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user_expressions=user_expressions,
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allow_stdin=allow_stdin,
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stop_on_error=stop_on_error,
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)
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if stdin_hook is None:
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stdin_hook = self._stdin_hook_default
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if output_hook is None:
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# detect IPython kernel
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if 'IPython' in sys.modules:
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from IPython import get_ipython
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ip = get_ipython()
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in_kernel = getattr(ip, 'kernel', False)
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if in_kernel:
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output_hook = partial(
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self._output_hook_kernel,
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ip.display_pub.session,
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ip.display_pub.pub_socket,
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ip.display_pub.parent_header,
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)
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if output_hook is None:
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# default: redisplay plain-text outputs
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output_hook = self._output_hook_default
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# set deadline based on timeout
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if timeout is not None:
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deadline = monotonic() + timeout
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else:
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timeout_ms = None
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poller = zmq.Poller()
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iopub_socket = self.iopub_channel.socket
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poller.register(iopub_socket, zmq.POLLIN)
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if allow_stdin:
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stdin_socket = self.stdin_channel.socket
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poller.register(stdin_socket, zmq.POLLIN)
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else:
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stdin_socket = None
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# wait for output and redisplay it
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while True:
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if timeout is not None:
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timeout = max(0, deadline - monotonic())
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timeout_ms = 1e3 * timeout
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events = dict(poller.poll(timeout_ms))
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if not events:
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raise TimeoutError("Timeout waiting for output")
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if stdin_socket in events:
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req = self.stdin_channel.get_msg(timeout=0)
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stdin_hook(req)
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continue
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if iopub_socket not in events:
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continue
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msg = self.iopub_channel.get_msg(timeout=0)
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if msg['parent_header'].get('msg_id') != msg_id:
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# not from my request
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continue
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output_hook(msg)
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# stop on idle
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if msg['header']['msg_type'] == 'status' and \
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msg['content']['execution_state'] == 'idle':
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break
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# output is done, get the reply
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if timeout is not None:
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timeout = max(0, deadline - monotonic())
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return self._recv_reply(msg_id, timeout=timeout)
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