|
|
#!/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, Dict, Float
|
|
|
from completer import KernelCompleter
|
|
|
from entry_point import base_launch_kernel
|
|
|
from session import Session, Message
|
|
|
from kernelapp import KernelApp
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Main kernel class
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
class Kernel(HasTraits):
|
|
|
|
|
|
# Private interface
|
|
|
|
|
|
# Time to sleep after flushing the stdout/err buffers in each execute
|
|
|
# cycle. While this introduces a hard limit on the minimal latency of the
|
|
|
# execute cycle, it helps prevent output synchronization problems for
|
|
|
# clients.
|
|
|
# Units are in seconds. The minimum zmq latency on local host is probably
|
|
|
# ~150 microseconds, set this to 500us for now. We may need to increase it
|
|
|
# a little if it's not enough after more interactive testing.
|
|
|
_execute_sleep = Float(0.0005, config=True)
|
|
|
|
|
|
# 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 = Dict()
|
|
|
|
|
|
#---------------------------------------------------------------------------
|
|
|
# Kernel interface
|
|
|
#---------------------------------------------------------------------------
|
|
|
|
|
|
session = Instance(Session)
|
|
|
shell_socket = Instance('zmq.Socket')
|
|
|
iopub_socket = Instance('zmq.Socket')
|
|
|
stdin_socket = Instance('zmq.Socket')
|
|
|
log = Instance('logging.Logger')
|
|
|
|
|
|
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,msg = self.session.recv(self.shell_socket,0)
|
|
|
assert ident is not None, "Missing message part."
|
|
|
omsg = Message(msg)
|
|
|
self.log.debug(str(omsg))
|
|
|
handler = self.handlers.get(omsg.msg_type, None)
|
|
|
if handler is None:
|
|
|
self.log.error("UNKNOWN MESSAGE TYPE: %s"%omsg)
|
|
|
else:
|
|
|
handler(ident, omsg)
|
|
|
|
|
|
def record_ports(self, ports):
|
|
|
"""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 = ports
|
|
|
|
|
|
#---------------------------------------------------------------------------
|
|
|
# Kernel request handlers
|
|
|
#---------------------------------------------------------------------------
|
|
|
|
|
|
def execute_request(self, ident, parent):
|
|
|
try:
|
|
|
code = parent[u'content'][u'code']
|
|
|
except:
|
|
|
self.log.error("Got bad msg: %s"%Message(parent))
|
|
|
return
|
|
|
pyin_msg = self.session.send(self.iopub_socket, u'pyin',{u'code':code}, parent=parent)
|
|
|
|
|
|
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.send(self.iopub_socket, u'pyerr', exc_content, parent)
|
|
|
reply_content = exc_content
|
|
|
else:
|
|
|
reply_content = { 'status' : 'ok', 'payload' : {} }
|
|
|
|
|
|
# Flush output before sending the reply.
|
|
|
sys.stderr.flush()
|
|
|
sys.stdout.flush()
|
|
|
# FIXME: on rare occasions, the flush doesn't seem to make it to the
|
|
|
# clients... This seems to mitigate the problem, but we definitely need
|
|
|
# to better understand what's going on.
|
|
|
if self._execute_sleep:
|
|
|
time.sleep(self._execute_sleep)
|
|
|
|
|
|
# Send the reply.
|
|
|
reply_msg = self.session.send(self.shell_socket, u'execute_reply', reply_content, parent, ident=ident)
|
|
|
self.log.debug(Message(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.shell_socket, 'complete_reply',
|
|
|
matches, parent, ident)
|
|
|
self.log.debug(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.shell_socket, 'object_info_reply',
|
|
|
object_info, parent, ident)
|
|
|
self.log.debug(msg)
|
|
|
|
|
|
def shutdown_request(self, ident, parent):
|
|
|
content = dict(parent['content'])
|
|
|
msg = self.session.send(self.shell_socket, 'shutdown_reply',
|
|
|
content, parent, ident)
|
|
|
msg = self.session.send(self.iopub_socket, 'shutdown_reply',
|
|
|
content, parent, ident)
|
|
|
self.log.debug(msg)
|
|
|
time.sleep(0.1)
|
|
|
sys.exit(0)
|
|
|
|
|
|
#---------------------------------------------------------------------------
|
|
|
# Protected interface
|
|
|
#---------------------------------------------------------------------------
|
|
|
|
|
|
def _abort_queue(self):
|
|
|
while True:
|
|
|
ident,msg = self.session.recv(self.shell_socket, zmq.NOBLOCK)
|
|
|
if msg is None:
|
|
|
# msg=None on EAGAIN
|
|
|
break
|
|
|
else:
|
|
|
assert ident is not None, "Missing message part."
|
|
|
self.log.debug("Aborting: %s"%Message(msg))
|
|
|
msg_type = msg['msg_type']
|
|
|
reply_type = msg_type.split('_')[0] + '_reply'
|
|
|
reply_msg = self.session.send(self.shell_socket, reply_type, {'status':'aborted'}, msg, ident=ident)
|
|
|
self.log.debug(Message(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.send(self.stdin_socket, u'input_request', content, parent)
|
|
|
|
|
|
# Await a response.
|
|
|
ident,reply = self.session.recv(self.stdin_socket, 0)
|
|
|
try:
|
|
|
value = reply['content']['value']
|
|
|
except:
|
|
|
self.log.error("Got bad raw_input reply: %s"%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(*args, **kwargs):
|
|
|
""" Launches a simple Python kernel, binding to the specified ports.
|
|
|
|
|
|
This function simply calls entry_point.base_launch_kernel with the right first
|
|
|
command to start a pykernel. See base_launch_kernel for arguments.
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
A tuple of form:
|
|
|
(kernel_process, xrep_port, pub_port, req_port, hb_port)
|
|
|
where kernel_process is a Popen object and the ports are integers.
|
|
|
"""
|
|
|
return base_launch_kernel('from IPython.zmq.pykernel import main; main()',
|
|
|
*args, **kwargs)
|
|
|
|
|
|
def main():
|
|
|
"""Run a PyKernel as an application"""
|
|
|
app = KernelApp.instance()
|
|
|
app.initialize()
|
|
|
app.start()
|
|
|
|
|
|
if __name__ == '__main__':
|
|
|
main()
|
|
|
|
