"""some generic utilities for dealing with classes, urls, and serialization Authors: * Min RK """ #----------------------------------------------------------------------------- # Copyright (C) 2010-2011 The IPython Development Team # # Distributed under the terms of the BSD License. The full license is in # the file COPYING, distributed as part of this software. #----------------------------------------------------------------------------- #----------------------------------------------------------------------------- # Imports #----------------------------------------------------------------------------- # Standard library imports. import logging import os import re import stat import socket import sys from signal import signal, SIGINT, SIGABRT, SIGTERM try: from signal import SIGKILL except ImportError: SIGKILL=None try: import cPickle pickle = cPickle except: cPickle = None import pickle # System library imports import zmq from zmq.log import handlers from IPython.external.decorator import decorator # IPython imports from IPython.config.application import Application from IPython.zmq.log import EnginePUBHandler from IPython.zmq.serialize import ( unserialize_object, serialize_object, pack_apply_message, unpack_apply_message ) #----------------------------------------------------------------------------- # Classes #----------------------------------------------------------------------------- class Namespace(dict): """Subclass of dict for attribute access to keys.""" def __getattr__(self, key): """getattr aliased to getitem""" if key in self.iterkeys(): return self[key] else: raise NameError(key) def __setattr__(self, key, value): """setattr aliased to setitem, with strict""" if hasattr(dict, key): raise KeyError("Cannot override dict keys %r"%key) self[key] = value class ReverseDict(dict): """simple double-keyed subset of dict methods.""" def __init__(self, *args, **kwargs): dict.__init__(self, *args, **kwargs) self._reverse = dict() for key, value in self.iteritems(): self._reverse[value] = key def __getitem__(self, key): try: return dict.__getitem__(self, key) except KeyError: return self._reverse[key] def __setitem__(self, key, value): if key in self._reverse: raise KeyError("Can't have key %r on both sides!"%key) dict.__setitem__(self, key, value) self._reverse[value] = key def pop(self, key): value = dict.pop(self, key) self._reverse.pop(value) return value def get(self, key, default=None): try: return self[key] except KeyError: return default #----------------------------------------------------------------------------- # Functions #----------------------------------------------------------------------------- @decorator def log_errors(f, self, *args, **kwargs): """decorator to log unhandled exceptions raised in a method. For use wrapping on_recv callbacks, so that exceptions do not cause the stream to be closed. """ try: return f(self, *args, **kwargs) except Exception: self.log.error("Uncaught exception in %r" % f, exc_info=True) def is_url(url): """boolean check for whether a string is a zmq url""" if '://' not in url: return False proto, addr = url.split('://', 1) if proto.lower() not in ['tcp','pgm','epgm','ipc','inproc']: return False return True def validate_url(url): """validate a url for zeromq""" if not isinstance(url, basestring): raise TypeError("url must be a string, not %r"%type(url)) url = url.lower() proto_addr = url.split('://') assert len(proto_addr) == 2, 'Invalid url: %r'%url proto, addr = proto_addr assert proto in ['tcp','pgm','epgm','ipc','inproc'], "Invalid protocol: %r"%proto # domain pattern adapted from http://www.regexlib.com/REDetails.aspx?regexp_id=391 # author: Remi Sabourin pat = re.compile(r'^([\w\d]([\w\d\-]{0,61}[\w\d])?\.)*[\w\d]([\w\d\-]{0,61}[\w\d])?$') if proto == 'tcp': lis = addr.split(':') assert len(lis) == 2, 'Invalid url: %r'%url addr,s_port = lis try: port = int(s_port) except ValueError: raise AssertionError("Invalid port %r in url: %r"%(port, url)) assert addr == '*' or pat.match(addr) is not None, 'Invalid url: %r'%url else: # only validate tcp urls currently pass return True def validate_url_container(container): """validate a potentially nested collection of urls.""" if isinstance(container, basestring): url = container return validate_url(url) elif isinstance(container, dict): container = container.itervalues() for element in container: validate_url_container(element) def split_url(url): """split a zmq url (tcp://ip:port) into ('tcp','ip','port').""" proto_addr = url.split('://') assert len(proto_addr) == 2, 'Invalid url: %r'%url proto, addr = proto_addr lis = addr.split(':') assert len(lis) == 2, 'Invalid url: %r'%url addr,s_port = lis return proto,addr,s_port def disambiguate_ip_address(ip, location=None): """turn multi-ip interfaces '0.0.0.0' and '*' into connectable ones, based on the location (default interpretation of location is localhost).""" if ip in ('0.0.0.0', '*'): try: external_ips = socket.gethostbyname_ex(socket.gethostname())[2] except (socket.gaierror, IndexError): # couldn't identify this machine, assume localhost external_ips = [] if location is None or location in external_ips or not external_ips: # If location is unspecified or cannot be determined, assume local ip='127.0.0.1' elif location: return location return ip def disambiguate_url(url, location=None): """turn multi-ip interfaces '0.0.0.0' and '*' into connectable ones, based on the location (default interpretation is localhost). This is for zeromq urls, such as tcp://*:10101.""" try: proto,ip,port = split_url(url) except AssertionError: # probably not tcp url; could be ipc, etc. return url ip = disambiguate_ip_address(ip,location) return "%s://%s:%s"%(proto,ip,port) #-------------------------------------------------------------------------- # helpers for implementing old MEC API via view.apply #-------------------------------------------------------------------------- def interactive(f): """decorator for making functions appear as interactively defined. This results in the function being linked to the user_ns as globals() instead of the module globals(). """ f.__module__ = '__main__' return f @interactive def _push(**ns): """helper method for implementing `client.push` via `client.apply`""" user_ns = globals() tmp = '_IP_PUSH_TMP_' while tmp in user_ns: tmp = tmp + '_' try: for name, value in ns.iteritems(): user_ns[tmp] = value exec "%s = %s" % (name, tmp) in user_ns finally: user_ns.pop(tmp, None) @interactive def _pull(keys): """helper method for implementing `client.pull` via `client.apply`""" if isinstance(keys, (list,tuple, set)): return map(lambda key: eval(key, globals()), keys) else: return eval(keys, globals()) @interactive def _execute(code): """helper method for implementing `client.execute` via `client.apply`""" exec code in globals() #-------------------------------------------------------------------------- # extra process management utilities #-------------------------------------------------------------------------- _random_ports = set() def select_random_ports(n): """Selects and return n random ports that are available.""" ports = [] for i in xrange(n): sock = socket.socket() sock.bind(('', 0)) while sock.getsockname()[1] in _random_ports: sock.close() sock = socket.socket() sock.bind(('', 0)) ports.append(sock) for i, sock in enumerate(ports): port = sock.getsockname()[1] sock.close() ports[i] = port _random_ports.add(port) return ports def signal_children(children): """Relay interupt/term signals to children, for more solid process cleanup.""" def terminate_children(sig, frame): log = Application.instance().log log.critical("Got signal %i, terminating children..."%sig) for child in children: child.terminate() sys.exit(sig != SIGINT) # sys.exit(sig) for sig in (SIGINT, SIGABRT, SIGTERM): signal(sig, terminate_children) def generate_exec_key(keyfile): import uuid newkey = str(uuid.uuid4()) with open(keyfile, 'w') as f: # f.write('ipython-key ') f.write(newkey+'\n') # set user-only RW permissions (0600) # this will have no effect on Windows os.chmod(keyfile, stat.S_IRUSR|stat.S_IWUSR) def integer_loglevel(loglevel): try: loglevel = int(loglevel) except ValueError: if isinstance(loglevel, str): loglevel = getattr(logging, loglevel) return loglevel def connect_logger(logname, context, iface, root="ip", loglevel=logging.DEBUG): logger = logging.getLogger(logname) if any([isinstance(h, handlers.PUBHandler) for h in logger.handlers]): # don't add a second PUBHandler return loglevel = integer_loglevel(loglevel) lsock = context.socket(zmq.PUB) lsock.connect(iface) handler = handlers.PUBHandler(lsock) handler.setLevel(loglevel) handler.root_topic = root logger.addHandler(handler) logger.setLevel(loglevel) def connect_engine_logger(context, iface, engine, loglevel=logging.DEBUG): logger = logging.getLogger() if any([isinstance(h, handlers.PUBHandler) for h in logger.handlers]): # don't add a second PUBHandler return loglevel = integer_loglevel(loglevel) lsock = context.socket(zmq.PUB) lsock.connect(iface) handler = EnginePUBHandler(engine, lsock) handler.setLevel(loglevel) logger.addHandler(handler) logger.setLevel(loglevel) return logger def local_logger(logname, loglevel=logging.DEBUG): loglevel = integer_loglevel(loglevel) logger = logging.getLogger(logname) if any([isinstance(h, logging.StreamHandler) for h in logger.handlers]): # don't add a second StreamHandler return handler = logging.StreamHandler() handler.setLevel(loglevel) formatter = logging.Formatter("%(asctime)s.%(msecs).03d [%(name)s] %(message)s", datefmt="%Y-%m-%d %H:%M:%S") handler.setFormatter(formatter) logger.addHandler(handler) logger.setLevel(loglevel) return logger