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132 lines
4.0 KiB
132 lines
4.0 KiB
"""Base class to manage comms"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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import sys
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import logging
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from traitlets.config import LoggingConfigurable
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from ipython_genutils.importstring import import_item
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from ipython_genutils.py3compat import string_types
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from traitlets import Instance, Unicode, Dict, Any, default
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from .comm import Comm
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class CommManager(LoggingConfigurable):
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"""Manager for Comms in the Kernel"""
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kernel = Instance('ipykernel.kernelbase.Kernel')
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comms = Dict()
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targets = Dict()
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# Public APIs
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def register_target(self, target_name, f):
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"""Register a callable f for a given target name
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f will be called with two arguments when a comm_open message is received with `target`:
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- the Comm instance
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- the `comm_open` message itself.
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f can be a Python callable or an import string for one.
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"""
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if isinstance(f, string_types):
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f = import_item(f)
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self.targets[target_name] = f
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def unregister_target(self, target_name, f):
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"""Unregister a callable registered with register_target"""
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return self.targets.pop(target_name)
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def register_comm(self, comm):
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"""Register a new comm"""
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comm_id = comm.comm_id
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comm.kernel = self.kernel
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self.comms[comm_id] = comm
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return comm_id
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def unregister_comm(self, comm):
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"""Unregister a comm, and close its counterpart"""
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# unlike get_comm, this should raise a KeyError
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comm = self.comms.pop(comm.comm_id)
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def get_comm(self, comm_id):
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"""Get a comm with a particular id
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Returns the comm if found, otherwise None.
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This will not raise an error,
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it will log messages if the comm cannot be found.
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"""
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try:
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return self.comms[comm_id]
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except KeyError:
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self.log.warning("No such comm: %s", comm_id)
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if self.log.isEnabledFor(logging.DEBUG):
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# don't create the list of keys if debug messages aren't enabled
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self.log.debug("Current comms: %s", list(self.comms.keys()))
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# Message handlers
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def comm_open(self, stream, ident, msg):
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"""Handler for comm_open messages"""
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content = msg['content']
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comm_id = content['comm_id']
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target_name = content['target_name']
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f = self.targets.get(target_name, None)
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comm = Comm(comm_id=comm_id,
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primary=False,
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target_name=target_name,
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)
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self.register_comm(comm)
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if f is None:
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self.log.error("No such comm target registered: %s", target_name)
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else:
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try:
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f(comm, msg)
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return
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except Exception:
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self.log.error("Exception opening comm with target: %s", target_name, exc_info=True)
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# Failure.
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try:
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comm.close()
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except:
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self.log.error("""Could not close comm during `comm_open` failure
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clean-up. The comm may not have been opened yet.""", exc_info=True)
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def comm_msg(self, stream, ident, msg):
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"""Handler for comm_msg messages"""
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content = msg['content']
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comm_id = content['comm_id']
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comm = self.get_comm(comm_id)
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if comm is None:
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return
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try:
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comm.handle_msg(msg)
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except Exception:
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self.log.error('Exception in comm_msg for %s', comm_id, exc_info=True)
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def comm_close(self, stream, ident, msg):
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"""Handler for comm_close messages"""
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content = msg['content']
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comm_id = content['comm_id']
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comm = self.get_comm(comm_id)
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if comm is None:
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return
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self.comms[comm_id]._closed = True
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del self.comms[comm_id]
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try:
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comm.handle_close(msg)
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except Exception:
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self.log.error('Exception in comm_close for %s', comm_id, exc_info=True)
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__all__ = ['CommManager']
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