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"""some generic utilities for dealing with classes, urls, and serialization
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Authors:
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* Min RK
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"""
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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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# Standard library imports.
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import logging
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import os
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import re
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import stat
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import socket
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import sys
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from signal import signal, SIGINT, SIGABRT, SIGTERM
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try:
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from signal import SIGKILL
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except ImportError:
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SIGKILL=None
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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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# System library imports
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import zmq
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from zmq.log import handlers
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from IPython.external.decorator import decorator
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# IPython imports
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from IPython.config.application import Application
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from IPython.zmq.log import EnginePUBHandler
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from IPython.zmq.serialize import (
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unserialize_object, serialize_object, pack_apply_message, unpack_apply_message
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)
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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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@decorator
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def log_errors(f, self, *args, **kwargs):
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"""decorator to log unhandled exceptions raised in a method.
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For use wrapping on_recv callbacks, so that exceptions
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do not cause the stream to be closed.
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"""
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try:
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return f(self, *args, **kwargs)
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except Exception:
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self.log.error("Uncaught exception in %r" % f, exc_info=True)
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def is_url(url):
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"""boolean check for whether a string is a zmq url"""
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if '://' not in url:
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return False
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proto, addr = url.split('://', 1)
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if proto.lower() not in ['tcp','pgm','epgm','ipc','inproc']:
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return False
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return True
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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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try:
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external_ips = socket.gethostbyname_ex(socket.gethostname())[2]
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except (socket.gaierror, IndexError):
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# couldn't identify this machine, assume localhost
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external_ips = []
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if location is None or location in external_ips or not external_ips:
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# If location is unspecified or cannot be determined, assume local
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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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#--------------------------------------------------------------------------
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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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user_ns = globals()
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tmp = '_IP_PUSH_TMP_'
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while tmp in user_ns:
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tmp = tmp + '_'
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try:
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for name, value in ns.iteritems():
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user_ns[tmp] = value
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exec "%s = %s" % (name, tmp) in user_ns
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finally:
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user_ns.pop(tmp, None)
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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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if isinstance(keys, (list,tuple, set)):
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return map(lambda key: eval(key, globals()), keys)
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else:
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return eval(keys, globals())
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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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#--------------------------------------------------------------------------
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# extra process management utilities
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#--------------------------------------------------------------------------
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_random_ports = set()
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def select_random_ports(n):
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"""Selects and return n random ports that are available."""
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ports = []
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for i in xrange(n):
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sock = socket.socket()
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sock.bind(('', 0))
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while sock.getsockname()[1] in _random_ports:
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sock.close()
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sock = socket.socket()
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sock.bind(('', 0))
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ports.append(sock)
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for i, sock in enumerate(ports):
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port = sock.getsockname()[1]
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sock.close()
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ports[i] = port
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_random_ports.add(port)
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return ports
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def signal_children(children):
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"""Relay interupt/term signals to children, for more solid process cleanup."""
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def terminate_children(sig, frame):
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log = Application.instance().log
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log.critical("Got signal %i, terminating children..."%sig)
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for child in children:
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child.terminate()
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sys.exit(sig != SIGINT)
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# sys.exit(sig)
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for sig in (SIGINT, SIGABRT, SIGTERM):
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signal(sig, terminate_children)
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def generate_exec_key(keyfile):
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import uuid
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newkey = str(uuid.uuid4())
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with open(keyfile, 'w') as f:
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# f.write('ipython-key ')
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f.write(newkey+'\n')
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# set user-only RW permissions (0600)
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# this will have no effect on Windows
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os.chmod(keyfile, stat.S_IRUSR|stat.S_IWUSR)
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def integer_loglevel(loglevel):
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try:
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loglevel = int(loglevel)
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except ValueError:
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if isinstance(loglevel, str):
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loglevel = getattr(logging, loglevel)
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return loglevel
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def connect_logger(logname, context, iface, root="ip", loglevel=logging.DEBUG):
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logger = logging.getLogger(logname)
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if any([isinstance(h, handlers.PUBHandler) for h in logger.handlers]):
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# don't add a second PUBHandler
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return
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loglevel = integer_loglevel(loglevel)
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lsock = context.socket(zmq.PUB)
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lsock.connect(iface)
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handler = handlers.PUBHandler(lsock)
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handler.setLevel(loglevel)
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handler.root_topic = root
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logger.addHandler(handler)
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logger.setLevel(loglevel)
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def connect_engine_logger(context, iface, engine, loglevel=logging.DEBUG):
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logger = logging.getLogger()
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if any([isinstance(h, handlers.PUBHandler) for h in logger.handlers]):
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# don't add a second PUBHandler
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return
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loglevel = integer_loglevel(loglevel)
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lsock = context.socket(zmq.PUB)
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lsock.connect(iface)
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handler = EnginePUBHandler(engine, lsock)
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handler.setLevel(loglevel)
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logger.addHandler(handler)
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logger.setLevel(loglevel)
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return logger
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def local_logger(logname, loglevel=logging.DEBUG):
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loglevel = integer_loglevel(loglevel)
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logger = logging.getLogger(logname)
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if any([isinstance(h, logging.StreamHandler) for h in logger.handlers]):
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# don't add a second StreamHandler
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return
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handler = logging.StreamHandler()
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handler.setLevel(loglevel)
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formatter = logging.Formatter("%(asctime)s.%(msecs).03d [%(name)s] %(message)s",
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datefmt="%Y-%m-%d %H:%M:%S")
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handler.setFormatter(formatter)
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logger.addHandler(handler)
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logger.setLevel(loglevel)
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return logger
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