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simplify completer logic as we don't exec on behalf of cell...
simplify completer logic as we don't exec on behalf of cell also skip making kernel completion request if kernel is busy

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frontend.py
197 lines | 6.2 KiB | text/x-python | PythonLexer
#!/usr/bin/env python
"""A simple interactive frontend that talks to a kernel over 0MQ.
"""
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
# stdlib
import cPickle as pickle
import code
import readline
import sys
import time
import uuid
# our own
import zmq
import session
import completer
from IPython.utils.localinterfaces import LOCALHOST
from IPython.zmq.session import Message
#-----------------------------------------------------------------------------
# Classes and functions
#-----------------------------------------------------------------------------
class Console(code.InteractiveConsole):
def __init__(self, locals=None, filename="<console>",
session = session,
request_socket=None,
sub_socket=None):
code.InteractiveConsole.__init__(self, locals, filename)
self.session = session
self.request_socket = request_socket
self.sub_socket = sub_socket
self.backgrounded = 0
self.messages = {}
# Set tab completion
self.completer = completer.ClientCompleter(self, session, request_socket)
readline.parse_and_bind('tab: complete')
readline.parse_and_bind('set show-all-if-ambiguous on')
readline.set_completer(self.completer.complete)
# Set system prompts
sys.ps1 = 'Py>>> '
sys.ps2 = ' ... '
sys.ps3 = 'Out : '
# Build dict of handlers for message types
self.handlers = {}
for msg_type in ['pyin', 'pyout', 'pyerr', 'stream']:
self.handlers[msg_type] = getattr(self, 'handle_%s' % msg_type)
def handle_pyin(self, omsg):
if omsg.parent_header.session == self.session.session:
return
c = omsg.content.code.rstrip()
if c:
print '[IN from %s]' % omsg.parent_header.username
print c
def handle_pyout(self, omsg):
#print omsg # dbg
if omsg.parent_header.session == self.session.session:
print "%s%s" % (sys.ps3, omsg.content.data)
else:
print '[Out from %s]' % omsg.parent_header.username
print omsg.content.data
def print_pyerr(self, err):
print >> sys.stderr, err.etype,':', err.evalue
print >> sys.stderr, ''.join(err.traceback)
def handle_pyerr(self, omsg):
if omsg.parent_header.session == self.session.session:
return
print >> sys.stderr, '[ERR from %s]' % omsg.parent_header.username
self.print_pyerr(omsg.content)
def handle_stream(self, omsg):
if omsg.content.name == 'stdout':
outstream = sys.stdout
else:
outstream = sys.stderr
print >> outstream, '*ERR*',
print >> outstream, omsg.content.data,
def handle_output(self, omsg):
handler = self.handlers.get(omsg.msg_type, None)
if handler is not None:
handler(omsg)
def recv_output(self):
while True:
ident,msg = self.session.recv(self.sub_socket)
if msg is None:
break
self.handle_output(Message(msg))
def handle_reply(self, rep):
# Handle any side effects on output channels
self.recv_output()
# Now, dispatch on the possible reply types we must handle
if rep is None:
return
if rep.content.status == 'error':
self.print_pyerr(rep.content)
elif rep.content.status == 'aborted':
print >> sys.stderr, "ERROR: ABORTED"
ab = self.messages[rep.parent_header.msg_id].content
if 'code' in ab:
print >> sys.stderr, ab.code
else:
print >> sys.stderr, ab
def recv_reply(self):
ident,rep = self.session.recv(self.request_socket)
mrep = Message(rep)
self.handle_reply(mrep)
return mrep
def runcode(self, code):
# We can't pickle code objects, so fetch the actual source
src = '\n'.join(self.buffer)
# for non-background inputs, if we do have previoiusly backgrounded
# jobs, check to see if they've produced results
if not src.endswith(';'):
while self.backgrounded > 0:
#print 'checking background'
rep = self.recv_reply()
if rep:
self.backgrounded -= 1
time.sleep(0.05)
# Send code execution message to kernel
omsg = self.session.send(self.request_socket,
'execute_request', dict(code=src))
self.messages[omsg.header.msg_id] = omsg
# Fake asynchronicity by letting the user put ';' at the end of the line
if src.endswith(';'):
self.backgrounded += 1
return
# For foreground jobs, wait for reply
while True:
rep = self.recv_reply()
if rep is not None:
break
self.recv_output()
time.sleep(0.05)
else:
# We exited without hearing back from the kernel!
print >> sys.stderr, 'ERROR!!! kernel never got back to us!!!'
class InteractiveClient(object):
def __init__(self, session, request_socket, sub_socket):
self.session = session
self.request_socket = request_socket
self.sub_socket = sub_socket
self.console = Console(None, '<zmq-console>',
session, request_socket, sub_socket)
def interact(self):
self.console.interact()
def main():
# Defaults
#ip = '192.168.2.109'
ip = LOCALHOST
#ip = '99.146.222.252'
port_base = 5575
connection = ('tcp://%s' % ip) + ':%i'
req_conn = connection % port_base
sub_conn = connection % (port_base+1)
# Create initial sockets
c = zmq.Context()
request_socket = c.socket(zmq.DEALER)
request_socket.connect(req_conn)
sub_socket = c.socket(zmq.SUB)
sub_socket.connect(sub_conn)
sub_socket.setsockopt(zmq.SUBSCRIBE, '')
# Make session and user-facing client
sess = session.Session()
client = InteractiveClient(sess, request_socket, sub_socket)
client.interact()
if __name__ == '__main__':
main()