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#!/usr/bin/env python
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"""edited session.py to work with streams, and move msg_type to the header
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"""
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import os
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import sys
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import traceback
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import pprint
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import uuid
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import zmq
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from zmq.utils import jsonapi
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from zmq.eventloop.zmqstream import ZMQStream
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from IPython.zmq.pickleutil import can, uncan, canSequence, uncanSequence
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from IPython.zmq.newserialized import serialize, unserialize
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try:
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import cPickle
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pickle = cPickle
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except:
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cPickle = None
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import pickle
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# packer priority: jsonlib[2], cPickle, simplejson/json, pickle
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json_name = '' if not jsonapi.jsonmod else jsonapi.jsonmod.__name__
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if json_name in ('jsonlib', 'jsonlib2'):
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use_json = True
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elif json_name:
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if cPickle is None:
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use_json = True
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else:
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use_json = False
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else:
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use_json = False
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def squash_unicode(obj):
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if isinstance(obj,dict):
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for key in obj.keys():
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obj[key] = squash_unicode(obj[key])
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if isinstance(key, unicode):
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obj[squash_unicode(key)] = obj.pop(key)
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elif isinstance(obj, list):
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for i,v in enumerate(obj):
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obj[i] = squash_unicode(v)
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elif isinstance(obj, unicode):
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obj = obj.encode('utf8')
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return obj
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if use_json:
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default_packer = jsonapi.dumps
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default_unpacker = lambda s: squash_unicode(jsonapi.loads(s))
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else:
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default_packer = lambda o: pickle.dumps(o,-1)
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default_unpacker = pickle.loads
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DELIM="<IDS|MSG>"
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def wrap_exception():
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etype, evalue, tb = sys.exc_info()
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tb = traceback.format_exception(etype, evalue, tb)
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exc_content = {
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u'status' : u'error',
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u'traceback' : tb,
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u'etype' : unicode(etype),
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u'evalue' : unicode(evalue)
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}
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return exc_content
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class KernelError(Exception):
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pass
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def unwrap_exception(content):
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err = KernelError(content['etype'], content['evalue'])
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err.evalue = content['evalue']
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err.etype = content['etype']
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err.traceback = ''.join(content['traceback'])
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return err
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class Message(object):
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"""A simple message object that maps dict keys to attributes.
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A Message can be created from a dict and a dict from a Message instance
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simply by calling dict(msg_obj)."""
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def __init__(self, msg_dict):
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dct = self.__dict__
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for k, v in dict(msg_dict).iteritems():
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if isinstance(v, dict):
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v = Message(v)
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dct[k] = v
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# Having this iterator lets dict(msg_obj) work out of the box.
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def __iter__(self):
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return iter(self.__dict__.iteritems())
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def __repr__(self):
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return repr(self.__dict__)
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def __str__(self):
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return pprint.pformat(self.__dict__)
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def __contains__(self, k):
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return k in self.__dict__
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def __getitem__(self, k):
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return self.__dict__[k]
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def msg_header(msg_id, msg_type, username, session):
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return locals()
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# return {
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# 'msg_id' : msg_id,
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# 'msg_type': msg_type,
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# 'username' : username,
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# 'session' : session
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# }
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def extract_header(msg_or_header):
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"""Given a message or header, return the header."""
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if not msg_or_header:
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return {}
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try:
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# See if msg_or_header is the entire message.
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h = msg_or_header['header']
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except KeyError:
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try:
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# See if msg_or_header is just the header
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h = msg_or_header['msg_id']
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except KeyError:
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raise
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else:
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h = msg_or_header
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if not isinstance(h, dict):
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h = dict(h)
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return h
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def rekey(dikt):
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"""rekey a dict that has been forced to use str keys where there should be
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ints by json. This belongs in the jsonutil added by fperez."""
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for k in dikt.iterkeys():
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if isinstance(k, str):
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ik=fk=None
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try:
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ik = int(k)
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except ValueError:
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try:
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fk = float(k)
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except ValueError:
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continue
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if ik is not None:
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nk = ik
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else:
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nk = fk
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if nk in dikt:
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raise KeyError("already have key %r"%nk)
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dikt[nk] = dikt.pop(k)
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return dikt
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def serialize_object(obj, threshold=64e-6):
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"""serialize an object into a list of sendable buffers.
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Returns: (pmd, bufs)
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where pmd is the pickled metadata wrapper, and bufs
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is a list of data buffers"""
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# threshold is 100 B
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databuffers = []
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if isinstance(obj, (list, tuple)):
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clist = canSequence(obj)
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slist = map(serialize, clist)
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for s in slist:
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if s.typeDescriptor in ('buffer', 'ndarray') or s.getDataSize() > threshold:
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databuffers.append(s.getData())
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s.data = None
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return pickle.dumps(slist,-1), databuffers
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elif isinstance(obj, dict):
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sobj = {}
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for k in sorted(obj.iterkeys()):
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s = serialize(can(obj[k]))
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if s.getDataSize() > threshold:
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databuffers.append(s.getData())
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s.data = None
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sobj[k] = s
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return pickle.dumps(sobj,-1),databuffers
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else:
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s = serialize(can(obj))
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if s.getDataSize() > threshold:
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databuffers.append(s.getData())
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s.data = None
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return pickle.dumps(s,-1),databuffers
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def unserialize_object(bufs):
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"""reconstruct an object serialized by serialize_object from data buffers"""
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bufs = list(bufs)
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sobj = pickle.loads(bufs.pop(0))
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if isinstance(sobj, (list, tuple)):
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for s in sobj:
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if s.data is None:
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s.data = bufs.pop(0)
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return uncanSequence(map(unserialize, sobj))
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elif isinstance(sobj, dict):
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newobj = {}
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for k in sorted(sobj.iterkeys()):
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s = sobj[k]
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if s.data is None:
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s.data = bufs.pop(0)
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newobj[k] = uncan(unserialize(s))
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return newobj
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else:
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if sobj.data is None:
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sobj.data = bufs.pop(0)
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return uncan(unserialize(sobj))
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def pack_apply_message(f, args, kwargs, threshold=64e-6):
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"""pack up a function, args, and kwargs to be sent over the wire
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as a series of buffers. Any object whose data is larger than `threshold`
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will not have their data copied (currently only numpy arrays support zero-copy)"""
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msg = [pickle.dumps(can(f),-1)]
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databuffers = [] # for large objects
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sargs, bufs = serialize_object(args,threshold)
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msg.append(sargs)
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databuffers.extend(bufs)
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skwargs, bufs = serialize_object(kwargs,threshold)
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msg.append(skwargs)
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databuffers.extend(bufs)
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msg.extend(databuffers)
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return msg
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def unpack_apply_message(bufs, g=None, copy=True):
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"""unpack f,args,kwargs from buffers packed by pack_apply_message()
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Returns: original f,args,kwargs"""
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bufs = list(bufs) # allow us to pop
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assert len(bufs) >= 3, "not enough buffers!"
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if not copy:
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for i in range(3):
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bufs[i] = bufs[i].bytes
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cf = pickle.loads(bufs.pop(0))
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sargs = list(pickle.loads(bufs.pop(0)))
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skwargs = dict(pickle.loads(bufs.pop(0)))
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# print sargs, skwargs
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f = uncan(cf, g)
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for sa in sargs:
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if sa.data is None:
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m = bufs.pop(0)
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if sa.getTypeDescriptor() in ('buffer', 'ndarray'):
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if copy:
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sa.data = buffer(m)
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else:
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sa.data = m.buffer
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else:
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if copy:
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sa.data = m
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else:
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sa.data = m.bytes
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args = uncanSequence(map(unserialize, sargs), g)
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kwargs = {}
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for k in sorted(skwargs.iterkeys()):
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sa = skwargs[k]
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if sa.data is None:
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sa.data = bufs.pop(0)
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kwargs[k] = uncan(unserialize(sa), g)
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return f,args,kwargs
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class StreamSession(object):
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"""tweaked version of IPython.zmq.session.Session, for development in Parallel"""
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debug=False
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def __init__(self, username=None, session=None, packer=None, unpacker=None):
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if username is None:
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username = os.environ.get('USER','username')
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self.username = username
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if session is None:
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self.session = str(uuid.uuid4())
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else:
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self.session = session
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self.msg_id = str(uuid.uuid4())
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if packer is None:
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self.pack = default_packer
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else:
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if not callable(packer):
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raise TypeError("packer must be callable, not %s"%type(packer))
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self.pack = packer
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if unpacker is None:
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self.unpack = default_unpacker
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else:
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if not callable(unpacker):
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raise TypeError("unpacker must be callable, not %s"%type(unpacker))
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self.unpack = unpacker
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self.none = self.pack({})
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def msg_header(self, msg_type):
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h = msg_header(self.msg_id, msg_type, self.username, self.session)
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self.msg_id = str(uuid.uuid4())
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return h
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def msg(self, msg_type, content=None, parent=None, subheader=None):
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msg = {}
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msg['header'] = self.msg_header(msg_type)
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msg['msg_id'] = msg['header']['msg_id']
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msg['parent_header'] = {} if parent is None else extract_header(parent)
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msg['msg_type'] = msg_type
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msg['content'] = {} if content is None else content
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sub = {} if subheader is None else subheader
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msg['header'].update(sub)
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return msg
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def send(self, stream, msg_type, content=None, buffers=None, parent=None, subheader=None, ident=None):
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"""Build and send a message via stream or socket.
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Parameters
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----------
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msg_type : str or Message/dict
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Normally, msg_type will be
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Returns
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-------
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(msg,sent) : tuple
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msg : Message
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the nice wrapped dict-like object containing the headers
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"""
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if isinstance(msg_type, (Message, dict)):
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# we got a Message, not a msg_type
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# don't build a new Message
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msg = msg_type
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content = msg['content']
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else:
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msg = self.msg(msg_type, content, parent, subheader)
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buffers = [] if buffers is None else buffers
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to_send = []
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if isinstance(ident, list):
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# accept list of idents
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to_send.extend(ident)
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elif ident is not None:
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to_send.append(ident)
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to_send.append(DELIM)
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to_send.append(self.pack(msg['header']))
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to_send.append(self.pack(msg['parent_header']))
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# if parent is None:
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# to_send.append(self.none)
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# else:
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# to_send.append(self.pack(dict(parent)))
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if content is None:
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content = self.none
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elif isinstance(content, dict):
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content = self.pack(content)
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elif isinstance(content, str):
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# content is already packed, as in a relayed message
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pass
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else:
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raise TypeError("Content incorrect type: %s"%type(content))
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to_send.append(content)
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flag = 0
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if buffers:
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flag = zmq.SNDMORE
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stream.send_multipart(to_send, flag, copy=False)
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for b in buffers[:-1]:
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stream.send(b, flag, copy=False)
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if buffers:
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stream.send(buffers[-1], copy=False)
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omsg = Message(msg)
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if self.debug:
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pprint.pprint(omsg)
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pprint.pprint(to_send)
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pprint.pprint(buffers)
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# return both the msg object and the buffers
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return omsg
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def send_raw(self, stream, msg, flags=0, copy=True, idents=None):
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"""send a raw message via idents.
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Parameters
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----------
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msg : list of sendable buffers"""
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to_send = []
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if isinstance(ident, str):
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ident = [ident]
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if ident is not None:
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to_send.extend(ident)
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to_send.append(DELIM)
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to_send.extend(msg)
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stream.send_multipart(msg, flags, copy=copy)
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def recv(self, socket, mode=zmq.NOBLOCK, content=True, copy=True):
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"""receives and unpacks a message
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returns [idents], msg"""
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if isinstance(socket, ZMQStream):
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socket = socket.socket
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try:
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msg = socket.recv_multipart(mode)
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except zmq.ZMQError, e:
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if e.errno == zmq.EAGAIN:
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# We can convert EAGAIN to None as we know in this case
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# recv_json won't return None.
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return None
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else:
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raise
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# return an actual Message object
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# determine the number of idents by trying to unpack them.
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# this is terrible:
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idents, msg = self.feed_identities(msg, copy)
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try:
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return idents, self.unpack_message(msg, content=content, copy=copy)
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except Exception, e:
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print idents, msg
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# TODO: handle it
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raise e
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def feed_identities(self, msg, copy=True):
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"""This is a completely horrible thing, but it strips the zmq
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ident prefixes off of a message. It will break if any identities
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are unpackable by self.unpack."""
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msg = list(msg)
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idents = []
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while len(msg) > 3:
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if copy:
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s = msg[0]
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else:
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s = msg[0].bytes
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if s == DELIM:
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msg.pop(0)
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break
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else:
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idents.append(s)
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msg.pop(0)
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return idents, msg
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def unpack_message(self, msg, content=True, copy=True):
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"""Return a message object from the format
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sent by self.send.
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Parameters:
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-----------
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content : bool (True)
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whether to unpack the content dict (True),
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or leave it serialized (False)
|
|
|
|
|
|
copy : bool (True)
|
|
|
whether to return the bytes (True),
|
|
|
or the non-copying Message object in each place (False)
|
|
|
|
|
|
"""
|
|
|
if not len(msg) >= 3:
|
|
|
raise TypeError("malformed message, must have at least 3 elements")
|
|
|
message = {}
|
|
|
if not copy:
|
|
|
for i in range(3):
|
|
|
msg[i] = msg[i].bytes
|
|
|
message['header'] = self.unpack(msg[0])
|
|
|
message['msg_type'] = message['header']['msg_type']
|
|
|
message['parent_header'] = self.unpack(msg[1])
|
|
|
if content:
|
|
|
message['content'] = self.unpack(msg[2])
|
|
|
else:
|
|
|
message['content'] = msg[2]
|
|
|
|
|
|
# message['buffers'] = msg[3:]
|
|
|
# else:
|
|
|
# message['header'] = self.unpack(msg[0].bytes)
|
|
|
# message['msg_type'] = message['header']['msg_type']
|
|
|
# message['parent_header'] = self.unpack(msg[1].bytes)
|
|
|
# if content:
|
|
|
# message['content'] = self.unpack(msg[2].bytes)
|
|
|
# else:
|
|
|
# message['content'] = msg[2].bytes
|
|
|
|
|
|
message['buffers'] = msg[3:]# [ m.buffer for m in msg[3:] ]
|
|
|
return message
|
|
|
|
|
|
|
|
|
|
|
|
def test_msg2obj():
|
|
|
am = dict(x=1)
|
|
|
ao = Message(am)
|
|
|
assert ao.x == am['x']
|
|
|
|
|
|
am['y'] = dict(z=1)
|
|
|
ao = Message(am)
|
|
|
assert ao.y.z == am['y']['z']
|
|
|
|
|
|
k1, k2 = 'y', 'z'
|
|
|
assert ao[k1][k2] == am[k1][k2]
|
|
|
|
|
|
am2 = dict(ao)
|
|
|
assert am['x'] == am2['x']
|
|
|
assert am['y']['z'] == am2['y']['z']
|
|
|
|
