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executable file 306 lines (254 sloc) 11.134 kb
#!/usr/bin/env python
"""A simple interactive kernel that talks to a frontend over 0MQ.
Things to do:
* Implement `set_parent` logic. Right before doing exec, the Kernel should
call set_parent on all the PUB objects with the message about to be executed.
* Implement random port and security key logic.
* Implement control messages.
* Implement event loop and poll version.
"""
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
# Standard library imports.
import __builtin__
from code import CommandCompiler
import sys
import time
import traceback
# System library imports.
import zmq
# Local imports.
from IPython.utils.traitlets import HasTraits, Instance
from completer import KernelCompleter
from entry_point import base_launch_kernel, make_default_main
from session import Session, Message
#-----------------------------------------------------------------------------
# Main kernel class
#-----------------------------------------------------------------------------
class Kernel(HasTraits):
# Private interface
# This is a dict of port number that the kernel is listening on. It is set
# by record_ports and used by connect_request.
_recorded_ports = None
#---------------------------------------------------------------------------
# Kernel interface
#---------------------------------------------------------------------------
session = Instance(Session)
reply_socket = Instance('zmq.Socket')
pub_socket = Instance('zmq.Socket')
req_socket = Instance('zmq.Socket')
def __init__(self, **kwargs):
super(Kernel, self).__init__(**kwargs)
self.user_ns = {}
self.history = []
self.compiler = CommandCompiler()
self.completer = KernelCompleter(self.user_ns)
# Build dict of handlers for message types
msg_types = [ 'execute_request', 'complete_request',
'object_info_request', 'shutdown_request' ]
self.handlers = {}
for msg_type in msg_types:
self.handlers[msg_type] = getattr(self, msg_type)
def start(self):
""" Start the kernel main loop.
"""
while True:
ident = self.reply_socket.recv()
assert self.reply_socket.rcvmore(), "Missing message part."
msg = self.reply_socket.recv_json()
omsg = Message(msg)
print>>sys.__stdout__
print>>sys.__stdout__, omsg
handler = self.handlers.get(omsg.msg_type, None)
if handler is None:
print >> sys.__stderr__, "UNKNOWN MESSAGE TYPE:", omsg
else:
handler(ident, omsg)
def record_ports(self, xrep_port, pub_port, req_port, hb_port):
"""Record the ports that this kernel is using.
The creator of the Kernel instance must call this methods if they
want the :meth:`connect_request` method to return the port numbers.
"""
self._recorded_ports = {
'xrep_port' : xrep_port,
'pub_port' : pub_port,
'req_port' : req_port,
'hb_port' : hb_port
}
#---------------------------------------------------------------------------
# Kernel request handlers
#---------------------------------------------------------------------------
def execute_request(self, ident, parent):
try:
code = parent[u'content'][u'code']
except:
print>>sys.__stderr__, "Got bad msg: "
print>>sys.__stderr__, Message(parent)
return
pyin_msg = self.session.msg(u'pyin',{u'code':code}, parent=parent)
self.pub_socket.send_json(pyin_msg)
try:
comp_code = self.compiler(code, '<zmq-kernel>')
# Replace raw_input. Note that is not sufficient to replace
# raw_input in the user namespace.
raw_input = lambda prompt='': self._raw_input(prompt, ident, parent)
__builtin__.raw_input = raw_input
# Set the parent message of the display hook and out streams.
sys.displayhook.set_parent(parent)
sys.stdout.set_parent(parent)
sys.stderr.set_parent(parent)
exec comp_code in self.user_ns, self.user_ns
except:
etype, evalue, tb = sys.exc_info()
tb = traceback.format_exception(etype, evalue, tb)
exc_content = {
u'status' : u'error',
u'traceback' : tb,
u'ename' : unicode(etype.__name__),
u'evalue' : unicode(evalue)
}
exc_msg = self.session.msg(u'pyerr', exc_content, parent)
self.pub_socket.send_json(exc_msg)
reply_content = exc_content
else:
reply_content = { 'status' : 'ok', 'payload' : {} }
# Flush output before sending the reply.
sys.stderr.flush()
sys.stdout.flush()
# Send the reply.
reply_msg = self.session.msg(u'execute_reply', reply_content, parent)
print>>sys.__stdout__, Message(reply_msg)
self.reply_socket.send(ident, zmq.SNDMORE)
self.reply_socket.send_json(reply_msg)
if reply_msg['content']['status'] == u'error':
self._abort_queue()
def complete_request(self, ident, parent):
matches = {'matches' : self._complete(parent),
'status' : 'ok'}
completion_msg = self.session.send(self.reply_socket, 'complete_reply',
matches, parent, ident)
print >> sys.__stdout__, completion_msg
def object_info_request(self, ident, parent):
context = parent['content']['oname'].split('.')
object_info = self._object_info(context)
msg = self.session.send(self.reply_socket, 'object_info_reply',
object_info, parent, ident)
print >> sys.__stdout__, msg
def shutdown_request(self, ident, parent):
content = dict(parent['content'])
msg = self.session.send(self.reply_socket, 'shutdown_reply',
content, parent, ident)
msg = self.session.send(self.pub_socket, 'shutdown_reply',
content, parent, ident)
print >> sys.__stdout__, msg
time.sleep(0.1)
sys.exit(0)
#---------------------------------------------------------------------------
# Protected interface
#---------------------------------------------------------------------------
def _abort_queue(self):
while True:
try:
ident = self.reply_socket.recv(zmq.NOBLOCK)
except zmq.ZMQError, e:
if e.errno == zmq.EAGAIN:
break
else:
assert self.reply_socket.rcvmore(), "Missing message part."
msg = self.reply_socket.recv_json()
print>>sys.__stdout__, "Aborting:"
print>>sys.__stdout__, Message(msg)
msg_type = msg['msg_type']
reply_type = msg_type.split('_')[0] + '_reply'
reply_msg = self.session.msg(reply_type, {'status':'aborted'}, msg)
print>>sys.__stdout__, Message(reply_msg)
self.reply_socket.send(ident,zmq.SNDMORE)
self.reply_socket.send_json(reply_msg)
# We need to wait a bit for requests to come in. This can probably
# be set shorter for true asynchronous clients.
time.sleep(0.1)
def _raw_input(self, prompt, ident, parent):
# Flush output before making the request.
sys.stderr.flush()
sys.stdout.flush()
# Send the input request.
content = dict(prompt=prompt)
msg = self.session.msg(u'input_request', content, parent)
self.req_socket.send_json(msg)
# Await a response.
reply = self.req_socket.recv_json()
try:
value = reply['content']['value']
except:
print>>sys.__stderr__, "Got bad raw_input reply: "
print>>sys.__stderr__, Message(parent)
value = ''
return value
def _complete(self, msg):
return self.completer.complete(msg.content.line, msg.content.text)
def _object_info(self, context):
symbol, leftover = self._symbol_from_context(context)
if symbol is not None and not leftover:
doc = getattr(symbol, '__doc__', '')
else:
doc = ''
object_info = dict(docstring = doc)
return object_info
def _symbol_from_context(self, context):
if not context:
return None, context
base_symbol_string = context[0]
symbol = self.user_ns.get(base_symbol_string, None)
if symbol is None:
symbol = __builtin__.__dict__.get(base_symbol_string, None)
if symbol is None:
return None, context
context = context[1:]
for i, name in enumerate(context):
new_symbol = getattr(symbol, name, None)
if new_symbol is None:
return symbol, context[i:]
else:
symbol = new_symbol
return symbol, []
#-----------------------------------------------------------------------------
# Kernel main and launch functions
#-----------------------------------------------------------------------------
def launch_kernel(ip=None, xrep_port=0, pub_port=0, req_port=0, hb_port=0,
independent=False):
""" Launches a localhost kernel, binding to the specified ports.
Parameters
----------
ip : str, optional
The ip address the kernel will bind to.
xrep_port : int, optional
The port to use for XREP channel.
pub_port : int, optional
The port to use for the SUB channel.
req_port : int, optional
The port to use for the REQ (raw input) channel.
hb_port : int, optional
The port to use for the hearbeat REP channel.
independent : bool, optional (default False)
If set, the kernel process is guaranteed to survive if this process
dies. If not set, an effort is made to ensure that the kernel is killed
when this process dies. Note that in this case it is still good practice
to kill kernels manually before exiting.
Returns
-------
A tuple of form:
(kernel_process, xrep_port, pub_port, req_port)
where kernel_process is a Popen object and the ports are integers.
"""
extra_arguments = []
if ip is not None:
extra_arguments.append('--ip')
if isinstance(ip, basestring):
extra_arguments.append(ip)
return base_launch_kernel('from IPython.zmq.pykernel import main; main()',
xrep_port, pub_port, req_port, hb_port,
independent, extra_arguments=extra_arguments)
main = make_default_main(Kernel)
if __name__ == '__main__':
main()
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