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kernel.py
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kernel.py
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#!/usr/bin/env python
"""A simple interactive kernel that talks to a frontend over 0MQ.
Things to do:
* Finish implementing `raw_input`.
* 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.
"""
import builtins as __builtin__
import sys
import time
import traceback
from code import InteractiveConsole as CommandCompiler # Use InteractiveConsole instead of CommandCompiler
import zmq
from session import Session, Message, extract_header
from completer import KernelCompleter
class OutStream(object):
"""A file-like object that publishes the stream to a 0MQ PUB socket."""
def __init__(self, session, pub_socket, name, max_buffer=200):
self.session = session
self.pub_socket = pub_socket
self.name = name
self._buffer = []
self._buffer_len = 0
self.max_buffer = max_buffer
self.parent_header = {}
def set_parent(self, parent):
self.parent_header = extract_header(parent)
def close(self):
self.pub_socket = None
def flush(self):
if self.pub_socket is None:
raise ValueError('I/O operation on a closed file')
else:
if self._buffer:
data = ''.join(self._buffer)
content = {'name': self.name, 'data': data}
msg = self.session.msg('stream', content=content,
parent=self.parent_header)
self.pub_socket.send_json(msg)
self._buffer_len = 0
self._buffer = []
def isatty(self):
return False
def __next__(self):
raise IOError('Read not supported on a write-only stream.')
def read(self, size=None):
raise IOError('Read not supported on a write-only stream.')
readline = read
def write(self, s):
if self.pub_socket is None:
raise ValueError('I/O operation on a closed file')
else:
self._buffer.append(s)
self._buffer_len += len(s)
self._maybe_send()
def _maybe_send(self):
if '\n' in self._buffer[-1]:
self.flush()
elif self._buffer_len > self.max_buffer:
self.flush()
def writelines(self, sequence):
if self.pub_socket is None:
raise ValueError('I/O operation on a closed file')
else:
for s in sequence:
self.write(s)
class DisplayHook(object):
def __init__(self, session, pub_socket):
self.session = session
self.pub_socket = pub_socket
self.parent_header = {}
def __call__(self, obj):
if obj is None:
return
__builtin__._ = obj
msg = self.session.msg('pyout', {'data': repr(obj)},
parent=self.parent_header)
self.pub_socket.send_json(msg)
def set_parent(self, parent):
self.parent_header = extract_header(parent)
class RawInput(object):
def __init__(self, session, socket):
self.session = session
self.socket = socket
def __call__(self, prompt=None):
msg = self.session.msg('raw_input')
self.socket.send_json(msg)
while True:
try:
reply = self.socket.recv_json(zmq.NOBLOCK)
except zmq.ZMQError as e:
if e.errno == zmq.EAGAIN:
pass
else:
raise
else:
break
return reply['content']['data']
class Kernel(object):
def __init__(self, session, reply_socket, pub_socket):
self.session = session
self.reply_socket = reply_socket
self.pub_socket = pub_socket
self.user_ns = {}
self.history = []
self.compiler = CommandCompiler()
self.completer = KernelCompleter(self.user_ns)
# Build dict of handlers for message types
self.handlers = {}
for msg_type in ['execute_request', 'complete_request']:
self.handlers[msg_type] = getattr(self, msg_type)
def abort_queue(self):
while True:
try:
ident = self.reply_socket.recv(zmq.NOBLOCK)
except zmq.ZMQError as e:
if e.errno == zmq.EAGAIN:
break
else:
assert self.reply_socket.rcvmore(), "Unexpected missing message part."
msg = self.reply_socket.recv_json()
print("Aborting:")
print(Message(msg), file=sys.__stdout__)
msg_type = msg['msg_type']
reply_type = msg_type.split('_')[0] + '_reply'
reply_msg = self.session.msg(reply_type, {'status': 'aborted'}, msg)
print(Message(reply_msg), file=sys.__stdout__)
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 execute_request(self, ident, parent):
try:
code = parent['content']['code']
except:
print("Got a bad message:")
print(Message(parent), file=sys.__stderr__)
return
pyin_msg = self.session.msg('pyin', {'code': code}, parent=parent)
self.pub_socket.send_json(pyin_msg)
try:
comp_code = self.compiler(code, '<zmq-kernel>')
sys.displayhook.set_parent(parent)
result = eval(comp_code, self.user_ns, self.user_ns)
except Exception as e:
result = 'error'
etype, evalue, tb = sys.exc_info()
tb = traceback.format_exception(etype, evalue, tb)
exc_content = {
'status': 'error',
'ename': str(etype),
'evalue': str(evalue),
'traceback': tb,
}
exc_msg = self.session.msg('error', exc_content, parent)
self.pub_socket.send_json(exc_msg)
else:
reply_content = {
'status': 'ok',
'execution_count': parent['content'].get('execution_count', 1),
'payload': [],
'user_expressions': {},
}
display_data = {
'data': {
'text/plain': repr(result),
},
'metadata': {},
}
reply_msg = self.session.msg('execute_reply', reply_content, parent)
display_msg = self.session.msg('display_data', display_data, parent)
self.pub_socket.send_json(reply_msg)
self.pub_socket.send_json(display_msg)
if result == '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(completion_msg, file=sys.__stdout__)
def complete(self, msg):
return self.completer.complete(msg['content']['line'], msg['content']['text'])
def start(self):
while True:
ident = self.reply_socket.recv()
assert self.reply_socket.rcvmore(), "Unexpected missing message part."
msg = self.reply_socket.recv_json()
omsg = Message(msg)
print("Received message from frontend2.py:", omsg)
print(omsg, file=sys.__stdout__)
handler = self.handlers.get(omsg['msg_type'], None)
if handler is None:
print("UNKNOWN MESSAGE TYPE:", omsg, file=sys.__stderr__)
else:
handler(ident, omsg)
def main():
try:
c = zmq.Context()
ip = '127.0.0.1'
port_base = 5555
connection = ('tcp://%s' % ip) + ':%i'
rep_conn = connection % port_base
pub_conn = connection % (port_base + 1)
print("Starting the kernel...")
print("On:", rep_conn, pub_conn, file=sys.__stdout__)
session = Session(username='kernel')
print("debug 1")
reply_socket = c.socket(zmq.ROUTER)
reply_socket.bind(rep_conn)
print("debug 1.1")
pub_socket = c.socket(zmq.PUB)
pub_socket.bind(pub_conn)
print("debug 1.2")
stdout = OutStream(session, pub_socket, 'stdout')
print("debug 1.21")
stderr = OutStream(session, pub_socket, 'stderr')
print("debug 1.22")
sys.stdout = stdout
print("debug 1.23")
sys.stderr = stderr
print("debug 1.3")
display_hook = DisplayHook(session, pub_socket)
sys.displayhook = display_hook
kernel = Kernel(session, reply_socket, pub_socket)
print("debug 2")
# For debugging convenience, put sleep and a string in the namespace, so we
# have them every time we start.
kernel.user_ns['sleep'] = time.sleep
kernel.user_ns['s'] = 'Test string'
print("Use Ctrl-\\ (NOT Ctrl-C!) to terminate.")
kernel.start()
except Exception as e:
print("An error occurred:", str(e))
finally:
if 'kernel' in locals():
# Close sockets and perform cleanup
reply_socket.close()
pub_socket.close()
c.term()
if __name__ == '__main__':
main()