"""Some generic utilities for dealing with classes, urls, and serialization.""" # Copyright (c) IPython Development Team. # Distributed under the terms of the Modified BSD License. import logging import os import re import stat import socket import sys import warnings from signal import signal, SIGINT, SIGABRT, SIGTERM try: from signal import SIGKILL except ImportError: SIGKILL=None from types import FunctionType try: import cPickle pickle = cPickle except: cPickle = None import pickle import zmq from zmq.log import handlers from IPython.external.decorator import decorator from IPython.config.application import Application from IPython.utils.localinterfaces import localhost, is_public_ip, public_ips from IPython.utils.py3compat import string_types, iteritems, itervalues from IPython.kernel.zmq.log import EnginePUBHandler from IPython.kernel.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: 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 iteritems(self): 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, string_types): 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, string_types): url = container return validate_url(url) elif isinstance(container, dict): container = itervalues(container) 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 a connectable address Explicit IP addresses are returned unmodified. Parameters ---------- ip : IP address An IP address, or the special values 0.0.0.0, or * location: IP address, optional A public IP of the target machine. If location is an IP of the current machine, localhost will be returned, otherwise location will be returned. """ if ip in {'0.0.0.0', '*'}: if not location: # unspecified location, localhost is the only choice ip = localhost() elif is_public_ip(location): # location is a public IP on this machine, use localhost ip = localhost() elif not public_ips(): # this machine's public IPs cannot be determined, # assume `location` is not this machine warnings.warn("IPython could not determine public IPs", RuntimeWarning) ip = location else: # location is not this machine, do not use loopback ip = 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(). """ # build new FunctionType, so it can have the right globals # interactive functions never have closures, that's kind of the point if isinstance(f, FunctionType): mainmod = __import__('__main__') f = FunctionType(f.__code__, mainmod.__dict__, f.__name__, f.__defaults__, ) # associate with __main__ for uncanning 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.items(): user_ns[tmp] = value exec("%s = %s" % (name, tmp), 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 [eval(key, globals()) for key in keys] else: return eval(keys, globals()) @interactive def _execute(code): """helper method for implementing `client.execute` via `client.apply`""" exec(code, 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 range(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 def set_hwm(sock, hwm=0): """set zmq High Water Mark on a socket in a way that always works for various pyzmq / libzmq versions. """ import zmq for key in ('HWM', 'SNDHWM', 'RCVHWM'): opt = getattr(zmq, key, None) if opt is None: continue try: sock.setsockopt(opt, hwm) except zmq.ZMQError: pass