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"""some generic utilities for dealing with classes, urls, and serialization"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2010-2011 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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import re
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import socket
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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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from IPython.utils.pickleutil import can, uncan, canSequence, uncanSequence
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from IPython.utils.newserialized import serialize, unserialize
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ISO8601="%Y-%m-%dT%H:%M:%S.%f"
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#-----------------------------------------------------------------------------
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# Classes
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#-----------------------------------------------------------------------------
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class Namespace(dict):
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"""Subclass of dict for attribute access to keys."""
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def __getattr__(self, key):
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"""getattr aliased to getitem"""
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if key in self.iterkeys():
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return self[key]
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else:
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raise NameError(key)
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def __setattr__(self, key, value):
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"""setattr aliased to setitem, with strict"""
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if hasattr(dict, key):
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raise KeyError("Cannot override dict keys %r"%key)
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self[key] = value
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class ReverseDict(dict):
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"""simple double-keyed subset of dict methods."""
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def __init__(self, *args, **kwargs):
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dict.__init__(self, *args, **kwargs)
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self._reverse = dict()
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for key, value in self.iteritems():
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self._reverse[value] = key
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def __getitem__(self, key):
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try:
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return dict.__getitem__(self, key)
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except KeyError:
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return self._reverse[key]
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def __setitem__(self, key, value):
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if key in self._reverse:
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raise KeyError("Can't have key %r on both sides!"%key)
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dict.__setitem__(self, key, value)
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self._reverse[value] = key
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def pop(self, key):
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value = dict.pop(self, key)
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self._reverse.pop(value)
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return value
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def get(self, key, default=None):
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try:
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return self[key]
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except KeyError:
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return default
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#-----------------------------------------------------------------------------
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# Functions
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#-----------------------------------------------------------------------------
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def validate_url(url):
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"""validate a url for zeromq"""
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if not isinstance(url, basestring):
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raise TypeError("url must be a string, not %r"%type(url))
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url = url.lower()
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proto_addr = url.split('://')
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assert len(proto_addr) == 2, 'Invalid url: %r'%url
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proto, addr = proto_addr
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assert proto in ['tcp','pgm','epgm','ipc','inproc'], "Invalid protocol: %r"%proto
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# domain pattern adapted from http://www.regexlib.com/REDetails.aspx?regexp_id=391
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# author: Remi Sabourin
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pat = re.compile(r'^([\w\d]([\w\d\-]{0,61}[\w\d])?\.)*[\w\d]([\w\d\-]{0,61}[\w\d])?$')
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if proto == 'tcp':
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lis = addr.split(':')
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assert len(lis) == 2, 'Invalid url: %r'%url
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addr,s_port = lis
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try:
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port = int(s_port)
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except ValueError:
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raise AssertionError("Invalid port %r in url: %r"%(port, url))
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assert addr == '*' or pat.match(addr) is not None, 'Invalid url: %r'%url
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else:
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# only validate tcp urls currently
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pass
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return True
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def validate_url_container(container):
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"""validate a potentially nested collection of urls."""
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if isinstance(container, basestring):
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url = container
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return validate_url(url)
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elif isinstance(container, dict):
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container = container.itervalues()
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for element in container:
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validate_url_container(element)
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def split_url(url):
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"""split a zmq url (tcp://ip:port) into ('tcp','ip','port')."""
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proto_addr = url.split('://')
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assert len(proto_addr) == 2, 'Invalid url: %r'%url
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proto, addr = proto_addr
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lis = addr.split(':')
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assert len(lis) == 2, 'Invalid url: %r'%url
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addr,s_port = lis
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return proto,addr,s_port
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def disambiguate_ip_address(ip, location=None):
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"""turn multi-ip interfaces '0.0.0.0' and '*' into connectable
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ones, based on the location (default interpretation of location is localhost)."""
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if ip in ('0.0.0.0', '*'):
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external_ips = socket.gethostbyname_ex(socket.gethostname())[2]
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if location is None or location in external_ips:
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ip='127.0.0.1'
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elif location:
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return location
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return ip
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def disambiguate_url(url, location=None):
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"""turn multi-ip interfaces '0.0.0.0' and '*' into connectable
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ones, based on the location (default interpretation is localhost).
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This is for zeromq urls, such as tcp://*:10101."""
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try:
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proto,ip,port = split_url(url)
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except AssertionError:
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# probably not tcp url; could be ipc, etc.
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return url
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ip = disambiguate_ip_address(ip,location)
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return "%s://%s:%s"%(proto,ip,port)
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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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Parameters
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----------
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obj : object
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The object to be serialized
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threshold : float
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The threshold for not double-pickling the content.
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Returns
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-------
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('pmd', [bufs]) :
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where pmd is the pickled metadata wrapper,
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bufs is a list of data buffers
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"""
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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.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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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.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(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)), bufs
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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, bufs
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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)), bufs
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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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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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kwargs[k] = uncan(unserialize(sa), g)
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return f,args,kwargs
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#--------------------------------------------------------------------------
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# helpers for implementing old MEC API via view.apply
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#--------------------------------------------------------------------------
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def interactive(f):
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"""decorator for making functions appear as interactively defined.
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This results in the function being linked to the user_ns as globals()
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instead of the module globals().
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"""
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f.__module__ = '__main__'
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return f
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@interactive
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def _push(ns):
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"""helper method for implementing `client.push` via `client.apply`"""
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globals().update(ns)
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@interactive
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def _pull(keys):
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"""helper method for implementing `client.pull` via `client.apply`"""
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user_ns = globals()
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if isinstance(keys, (list,tuple, set)):
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for key in keys:
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if not user_ns.has_key(key):
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raise NameError("name '%s' is not defined"%key)
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return map(user_ns.get, keys)
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else:
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if not user_ns.has_key(keys):
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raise NameError("name '%s' is not defined"%keys)
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return user_ns.get(keys)
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@interactive
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def _execute(code):
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"""helper method for implementing `client.execute` via `client.apply`"""
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exec code in globals()
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