diff --git a/mediaproxy/dispatcher.py b/mediaproxy/dispatcher.py index d765855..9d40a0a 100644 --- a/mediaproxy/dispatcher.py +++ b/mediaproxy/dispatcher.py @@ -1,613 +1,613 @@ """Implementation of the MediaProxy dispatcher""" import hashlib import random import signal import cPickle as pickle import cjson from base64 import b64encode as base64_encode from collections import deque from itertools import ifilter from time import time from application import log from application.process import process from application.system import unlink from gnutls.errors import CertificateSecurityError from gnutls.interfaces.twisted import TLSContext from twisted.protocols.basic import LineOnlyReceiver from twisted.python import failure from twisted.internet.error import ConnectionDone, TCPTimedOutError from twisted.internet.protocol import Factory, connectionDone from twisted.internet.defer import Deferred, DeferredList, maybeDeferred, succeed from twisted.internet import reactor from mediaproxy import __version__ from mediaproxy.configuration import DispatcherConfig from mediaproxy.interfaces import opensips from mediaproxy.scheduler import RecurrentCall, KeepRunning from mediaproxy.tls import X509Credentials class CommandError(Exception): pass class Command(object): def __init__(self, name, headers=None): self.name = name self.headers = headers or [] try: self.parsed_headers = dict(header.split(': ', 1) for header in self.headers) except Exception: raise CommandError('Could not parse command headers') else: self.__dict__['session_id'] = None if self.call_id is None else base64_encode(hashlib.md5(self.call_id).digest()).rstrip('=') @property def call_id(self): return self.parsed_headers.get('call_id') @property def dialog_id(self): return self.parsed_headers.get('dialog_id') @property def session_id(self): return self.__dict__['session_id'] class ProtocolLogger(log.ContextualLogger): def __init__(self, name): super(ProtocolLogger, self).__init__(logger=log.get_logger()) # use the main logger as backend self.name = name def apply_context(self, message): return '[{0}] {1}'.format(self.name, message) if message != '' else '' class SessionLogger(log.ContextualLogger): def __init__(self, session): super(SessionLogger, self).__init__(logger=log.get_logger()) # use the main logger as backend self.session_id = session.call_id self.relay_ip = session.relay_ip def apply_context(self, message): return '[session {0.session_id} at {0.relay_ip}] {1}'.format(self, message) if message != '' else '' class ControlProtocol(LineOnlyReceiver): logger = None # type: ProtocolLogger noisy = False def __init__(self): self.in_progress = 0 def lineReceived(self, line): raise NotImplementedError() def connectionLost(self, reason=connectionDone): if isinstance(reason.value, connectionDone.type): self.logger.info('Connection closed') else: self.logger.warning('Connection lost: {}'.format(reason.value)) self.factory.connection_lost(self) def reply(self, reply): self.transport.write(reply + self.delimiter) def _error_handler(self, failure): failure.trap(CommandError, RelayError) self.logger.error(failure.value) self.reply('error') def _catch_all(self, failure): self.logger.error(failure.getTraceback()) self.reply('error') def _decrement(self, result): self.in_progress = 0 if self.factory.shutting_down: self.transport.loseConnection() def _add_callbacks(self, defer): defer.addCallback(self.reply) defer.addErrback(self._error_handler) defer.addErrback(self._catch_all) defer.addBoth(self._decrement) class OpenSIPSControlProtocol(ControlProtocol): logger = ProtocolLogger(name='OpenSIPS Interface') def __init__(self): self.request_lines = [] ControlProtocol.__init__(self) def lineReceived(self, line): if line == '': if self.request_lines: self.in_progress += 1 defer = maybeDeferred(self.handle_request, self.request_lines) self._add_callbacks(defer) self.request_lines = [] elif not line.endswith(': '): self.request_lines.append(line) def handle_request(self, request_lines): command = Command(name=request_lines[0], headers=request_lines[1:]) if command.call_id is None: raise CommandError('Request is missing the call_id header') return self.factory.dispatcher.send_command(command) class ManagementControlProtocol(ControlProtocol): logger = ProtocolLogger(name='Management Interface') def connectionMade(self): if DispatcherConfig.management_use_tls and DispatcherConfig.management_passport is not None: peer_cert = self.transport.getPeerCertificate() if not DispatcherConfig.management_passport.accept(peer_cert): - self.transport.loseConnection(CertificateSecurityError('peer certificate not accepted')) + self.transport.loseConnection() return def lineReceived(self, line): if line in ['quit', 'exit']: self.transport.loseConnection() elif line == 'summary': defer = self.factory.dispatcher.relay_factory.get_summary() self._add_callbacks(defer) elif line == 'sessions': defer = self.factory.dispatcher.relay_factory.get_statistics() self._add_callbacks(defer) elif line == 'version': self.reply(__version__) else: self.logger.error('Unknown command: %s' % line) self.reply('error') class ControlFactory(Factory): noisy = False def __init__(self, dispatcher): self.dispatcher = dispatcher self.protocols = [] self.shutting_down = False def buildProtocol(self, addr): protocol = Factory.buildProtocol(self, addr) self.protocols.append(protocol) return protocol def connection_lost(self, prot): self.protocols.remove(prot) if self.shutting_down and len(self.protocols) == 0: self.defer.callback(None) def shutdown(self): if self.shutting_down: return self.shutting_down = True if len(self.protocols) == 0: return succeed(None) else: for prot in self.protocols: if prot.in_progress == 0: prot.transport.loseConnection() self.defer = Deferred() return self.defer class OpenSIPSControlFactory(ControlFactory): protocol = OpenSIPSControlProtocol class ManagementControlFactory(ControlFactory): protocol = ManagementControlProtocol class RelayError(Exception): pass class ConnectionReplaced(ConnectionDone): pass class RelayServerProtocol(LineOnlyReceiver): MAX_LENGTH = 4096*1024 # 4MB noisy = False def __init__(self): self.ip = None # type: str self.logger = None # type: ProtocolLogger self.commands = {} self.halting = False self.timedout = False self.disconnect_timer = None self.sequence_number = 0 self.authenticated = False @property def active(self): return not self.halting and not self.timedout def send_command(self, command): if command.call_id: self.logger.info('Requesting {0.name!r} for session {0.session_id}'.format(command)) else: self.logger.info('Requesting {0.name!r}'.format(command)) sequence_number = str(self.sequence_number) self.sequence_number += 1 defer = Deferred() timer = reactor.callLater(DispatcherConfig.relay_timeout, self._timeout, sequence_number) self.commands[sequence_number] = (command, defer, timer) self.transport.write(self.delimiter.join(['{} {}'.format(command.name, sequence_number)] + command.headers) + 2*self.delimiter) return defer def reply(self, reply): self.transport.write(reply + self.delimiter) def _timeout(self, sequence_number): command, defer, timer = self.commands.pop(sequence_number) defer.errback(RelayError('%r command failed: relay at %s timed out' % (command.name, self.ip))) if self.timedout is False: self.timedout = True self.disconnect_timer = reactor.callLater(DispatcherConfig.relay_recover_interval, self.transport.connectionLost, failure.Failure(TCPTimedOutError())) def connectionMade(self): if DispatcherConfig.passport is not None: peer_cert = self.transport.getPeerCertificate() if not DispatcherConfig.passport.accept(peer_cert): - self.transport.loseConnection(CertificateSecurityError('peer certificate not accepted')) + self.transport.loseConnection() return self.authenticated = True self.factory.new_relay(self) def lineReceived(self, line): try: first, rest = line.split(' ', 1) except ValueError: first = line rest = '' if first == 'expired': try: stats = cjson.decode(rest) except cjson.DecodeError as e: self.logger.error('Could not decode JSON: {}'.format(e)) else: call_id = stats['call_id'] session = self.factory.sessions.get(call_id, None) if session is None: self.logger.error('Expired session has unknown call_id %s' % call_id) return if session.relay_ip != self.ip: session.logger.error('relay at %s reported the session as expired, ignoring' % self.ip) return all_streams_ice = all(stream_info['status'] == 'unselected ICE candidate' for stream_info in stats['streams']) if all_streams_ice: session.logger.info('removed because ICE was used') stats['timed_out'] = False else: session.logger.info('did timeout') stats['timed_out'] = True stats['dialog_id'] = session.dialog_id stats['all_streams_ice'] = all_streams_ice self.factory.dispatcher.update_statistics(session, stats) if session.dialog_id is not None and stats['start_time'] is not None and not all_streams_ice: self.factory.dispatcher.opensips_management.end_dialog(session.dialog_id) session.expire_time = time() else: del self.factory.sessions[call_id] return elif first == 'ping': if self.timedout is True: self.timedout = False if self.disconnect_timer.active(): self.disconnect_timer.cancel() self.disconnect_timer = None self.reply('pong') return try: command, defer, timer = self.commands.pop(first) except KeyError: self.logger.error('Got unexpected response: {}'.format(line)) return timer.cancel() if rest == 'error': defer.errback(RelayError('Relay replied with error')) elif rest == 'halting': self.halting = True defer.errback(RelayError('Relay is shutting down')) elif command.name == 'remove': try: stats = cjson.decode(rest) except cjson.DecodeError: self.logger.error('Error decoding JSON') else: call_id = stats['call_id'] session = self.factory.sessions[call_id] stats['dialog_id'] = session.dialog_id stats['timed_out'] = False self.factory.dispatcher.update_statistics(session, stats) del self.factory.sessions[call_id] defer.callback('removed') else: # update command defer.callback(rest) def connectionLost(self, reason=connectionDone): if reason.type == ConnectionDone: self.logger.info('Connection closed') elif reason.type == ConnectionReplaced: self.logger.warning('Connection replaced') else: self.logger.error('Connection lost: {}'.format(reason.value)) for command, defer, timer in self.commands.itervalues(): timer.cancel() defer.errback(RelayError('Relay disconnected')) if self.timedout is True: self.timedout = False if self.disconnect_timer.active(): self.disconnect_timer.cancel() self.disconnect_timer = None self.factory.connection_lost(self) class RelaySession(object): def __init__(self, relay, command): self.relay_ip = relay.ip self.call_id = command.call_id self.session_id = command.session_id self.dialog_id = command.dialog_id self.logger = SessionLogger(self) self.expire_time = None def __getstate__(self): state = self.__dict__.copy() del state['logger'] return state def __setstate__(self, state): self.__dict__.update(state) self.logger = SessionLogger(self) class RelayFactory(Factory): protocol = RelayServerProtocol noisy = False def __init__(self, dispatcher): self.dispatcher = dispatcher self.relays = {} self.shutting_down = False state_file = process.runtime.file('dispatcher_state') try: self.sessions = pickle.load(open(state_file)) except Exception: self.sessions = {} self.cleanup_timers = {} else: self.cleanup_timers = dict((ip, reactor.callLater(DispatcherConfig.cleanup_dead_relays_after, self._do_cleanup, ip)) for ip in set(session.relay_ip for session in self.sessions.itervalues())) unlink(state_file) self.expired_cleaner = RecurrentCall(600, self._remove_expired_sessions) def _remove_expired_sessions(self): now, limit = time(), DispatcherConfig.cleanup_expired_sessions_after obsolete = [k for k, s in ifilter(lambda (k, s): s.expire_time and (now-s.expire_time>=limit), self.sessions.iteritems())] if obsolete: [self.sessions.pop(call_id) for call_id in obsolete] log.warning('found %d expired sessions which were not removed during the last %d hours' % (len(obsolete), round(limit / 3600.0))) return KeepRunning def buildProtocol(self, addr): protocol = Factory.buildProtocol(self, addr) protocol.ip = addr.host protocol.logger = ProtocolLogger(name='relay {}'.format(addr.host)) protocol.logger.info('Connection established') return protocol def new_relay(self, relay): old_relay = self.relays.pop(relay.ip, None) if old_relay is not None: relay.logger.warning('Reconnected, closing old connection') reactor.callLater(0, old_relay.transport.connectionLost, failure.Failure(ConnectionReplaced('relay reconnected'))) self.relays[relay.ip] = relay timer = self.cleanup_timers.pop(relay.ip, None) if timer is not None: timer.cancel() defer = relay.send_command(Command('sessions')) defer.addCallback(self._cb_purge_sessions, relay.ip) def _cb_purge_sessions(self, result, relay_ip): relay_sessions = cjson.decode(result) relay_call_ids = [session['call_id'] for session in relay_sessions] for session_id, session in self.sessions.items(): if session.expire_time is None and session.relay_ip == relay_ip and session_id not in relay_call_ids: session.logger.warning('Relay does not have the session anymore, statistics are probably lost') if session.dialog_id is not None: self.dispatcher.opensips_management.end_dialog(session.dialog_id) del self.sessions[session_id] def send_command(self, command): session = self.sessions.get(command.call_id, None) if session and session.expire_time is None: relay = session.relay_ip if relay not in self.relays: session.logger.error('Request {0.name!r} failed: relay no longer connected'.format(command)) raise RelayError('Request {0.name!r} failed: relay no longer connected'.format(command)) return self.relays[relay].send_command(command) # We do not have a session for this call_id or the session is already expired if command.name == 'update': preferred_relay = command.parsed_headers.get('media_relay') try_relays = deque(protocol for protocol in self.relays.itervalues() if protocol.active and protocol.ip != preferred_relay) random.shuffle(try_relays) if preferred_relay is not None: protocol = self.relays.get(preferred_relay) if protocol is not None and protocol.active: try_relays.appendleft(protocol) else: log.warning('user requested media_relay %s is not available' % preferred_relay) defer = self._try_next(try_relays, command) defer.addCallback(self._add_session, try_relays, command) return defer elif command.name == 'remove' and session: # This is the remove we received for an expired session for which we triggered dialog termination del self.sessions[command.call_id] return 'removed' else: raise RelayError('Got {0.name!r} for unknown session {0.session_id}'.format(command)) def _add_session(self, result, try_relays, command): self.sessions[command.call_id] = RelaySession(try_relays[0], command) return result def _relay_error(self, failure, try_relays, command): failure.trap(RelayError) failed_relay = try_relays.popleft() failed_relay.logger.warning('The {0.name!r} request failed: {1.value}'.format(command, failure)) return self._try_next(try_relays, command) def _try_next(self, try_relays, command): if len(try_relays) == 0: raise RelayError('No suitable relay found') defer = try_relays[0].send_command(command) defer.addErrback(self._relay_error, try_relays, command) return defer def get_summary(self): command = Command('summary') defer = DeferredList([relay.send_command(command).addErrback(self._summary_error, command, relay) for relay in self.relays.itervalues()]) defer.addCallback(self._got_summaries) return defer def _summary_error(self, failure, command, relay): relay.logger.error('The {0.name!r} request failed: {1.value}'.format(command, failure)) return cjson.encode(dict(status='error', ip=relay.ip)) def _got_summaries(self, results): return '[%s]' % ', '.join(result for succeeded, result in results if succeeded) def get_statistics(self): command = Command('sessions') defer = DeferredList([relay.send_command(command).addErrback(self._statistics_error, command, relay) for relay in self.relays.itervalues()]) defer.addCallback(self._got_statistics) return defer def _statistics_error(self, failure, command, relay): relay.logger.error('The {0.name!r} request failed: {1.value}'.format(command, failure)) return cjson.encode([]) def _got_statistics(self, results): return '[%s]' % ', '.join(result[1:-1] for succeeded, result in results if succeeded and result != '[]') def connection_lost(self, relay): if relay not in self.relays.itervalues(): return if relay.authenticated: del self.relays[relay.ip] if self.shutting_down: if len(self.relays) == 0: self.defer.callback(None) else: self.cleanup_timers[relay.ip] = reactor.callLater(DispatcherConfig.cleanup_dead_relays_after, self._do_cleanup, relay.ip) def _do_cleanup(self, ip): log.debug('Cleaning up after old relay at %s' % ip) del self.cleanup_timers[ip] for call_id in (call_id for call_id, session in self.sessions.items() if session.relay_ip == ip): del self.sessions[call_id] def shutdown(self): if self.shutting_down: return self.shutting_down = True for timer in self.cleanup_timers.itervalues(): timer.cancel() if len(self.relays) == 0: retval = succeed(None) else: for prot in self.relays.itervalues(): prot.transport.loseConnection() self.defer = Deferred() retval = self.defer retval.addCallback(self._save_state) return retval def _save_state(self, result): pickle.dump(self.sessions, open(process.runtime.file('dispatcher_state'), 'w')) class Dispatcher(object): def __init__(self): self.accounting = [__import__('mediaproxy.interfaces.accounting.%s' % mod.lower(), globals(), locals(), ['']).Accounting() for mod in set(DispatcherConfig.accounting)] self.cred = X509Credentials(cert_name='dispatcher') self.tls_context = TLSContext(self.cred) self.relay_factory = RelayFactory(self) dispatcher_addr, dispatcher_port = DispatcherConfig.listen self.relay_listener = reactor.listenTLS(dispatcher_port, self.relay_factory, self.tls_context, interface=dispatcher_addr) self.opensips_factory = OpenSIPSControlFactory(self) socket_path = process.runtime.file(DispatcherConfig.socket_path) unlink(socket_path) self.opensips_listener = reactor.listenUNIX(socket_path, self.opensips_factory) self.opensips_management = opensips.ManagementInterface() self.management_factory = ManagementControlFactory(self) management_addr, management_port = DispatcherConfig.listen_management if DispatcherConfig.management_use_tls: self.management_listener = reactor.listenTLS(management_port, self.management_factory, self.tls_context, interface=management_addr) else: self.management_listener = reactor.listenTCP(management_port, self.management_factory, interface=management_addr) def run(self): log.debug('Using {0.__class__.__name__}'.format(reactor)) process.signals.add_handler(signal.SIGHUP, self._handle_signal) process.signals.add_handler(signal.SIGINT, self._handle_signal) process.signals.add_handler(signal.SIGTERM, self._handle_signal) process.signals.add_handler(signal.SIGUSR1, self._handle_signal) for accounting_module in self.accounting: accounting_module.start() reactor.run(installSignalHandlers=False) def stop(self): reactor.callFromThread(self._shutdown) def send_command(self, command): return maybeDeferred(self.relay_factory.send_command, command) def update_statistics(self, session, stats): session.logger.info('statistics: {}'.format(stats)) if stats['start_time'] is not None: for accounting in self.accounting: try: accounting.do_accounting(stats) except Exception, e: log.exception('An unhandled error occurred while doing accounting: %s' % e) def _handle_signal(self, signum, frame): if signum == signal.SIGUSR1: # toggle debugging if log.level.current != log.level.DEBUG: log.level.current = log.level.DEBUG log.info('Switched logging level to DEBUG') else: log.info('Switched logging level to {}'.format(DispatcherConfig.log_level)) log.level.current = DispatcherConfig.log_level else: # terminate program signal_map = {signal.SIGTERM: 'Terminated', signal.SIGINT: 'Interrupted', signal.SIGHUP: 'Hangup'} log.info(signal_map.get(signum, 'Received signal {}, exiting.'.format(signum))) self.stop() def _shutdown(self): defer = DeferredList([result for result in [self.opensips_listener.stopListening(), self.management_listener.stopListening(), self.relay_listener.stopListening()] if result is not None]) defer.addCallback(lambda x: self.opensips_factory.shutdown()) defer.addCallback(lambda x: self.management_factory.shutdown()) defer.addCallback(lambda x: self.relay_factory.shutdown()) defer.addCallback(lambda x: self._stop()) def _stop(self): for act in self.accounting: act.stop() reactor.stop() diff --git a/mediaproxy/relay.py b/mediaproxy/relay.py index c337749..9c59f34 100644 --- a/mediaproxy/relay.py +++ b/mediaproxy/relay.py @@ -1,392 +1,392 @@ """Implementation of the MediaProxy relay""" import cjson import signal import resource try: from twisted.internet import epollreactor; epollreactor.install() except: raise RuntimeError('mandatory epoll reactor support is not available from the twisted framework') from application import log from application.process import process from gnutls.errors import CertificateError, CertificateSecurityError from gnutls.interfaces.twisted import TLSContext from time import time from twisted.protocols.basic import LineOnlyReceiver from twisted.internet.error import ConnectionDone, TCPTimedOutError, DNSLookupError from twisted.internet.protocol import ClientFactory, connectionDone from twisted.internet.defer import DeferredList, succeed from twisted.internet import reactor from twisted.python import failure from twisted.names import dns from twisted.names.client import lookupService from twisted.names.error import DomainError from mediaproxy import __version__ from mediaproxy.configuration import RelayConfig from mediaproxy.headers import DecodingDict, DecodingError from mediaproxy.mediacontrol import SessionManager, RelayPortsExhaustedError from mediaproxy.scheduler import RecurrentCall, KeepRunning from mediaproxy.tls import X509Credentials # Increase the system limit for the maximum number of open file descriptors # to be able to handle connections to all ports in port_range fd_limit = RelayConfig.port_range.end - RelayConfig.port_range.start + 1000 try: resource.setrlimit(resource.RLIMIT_NOFILE, (fd_limit, fd_limit)) except ValueError: raise RuntimeError('Cannot set resource limit for maximum open file descriptors to %d' % fd_limit) else: new_limits = resource.getrlimit(resource.RLIMIT_NOFILE) if new_limits < (fd_limit, fd_limit): raise RuntimeError("Allocated resource limit for maximum open file descriptors is less then requested (%d instead of %d)" % (new_limits[0], fd_limit)) else: log.info('Set resource limit for maximum open file descriptors to %d' % fd_limit) class RelayClientProtocol(LineOnlyReceiver): noisy = False required_headers = {'update': {'call_id', 'from_tag', 'from_uri', 'to_uri', 'cseq', 'user_agent', 'type'}, 'remove': {'call_id', 'from_tag'}, 'summary': set(), 'sessions': set()} def __init__(self): self.command = None self.seq = None self.headers = DecodingDict() self._connection_watcher = None self._queued_keepalives = 0 def _send_keepalive(self): if self._queued_keepalives >= 3: log.error('missed 3 keepalive answers in a row. assuming the connection is down.') # do not use loseConnection() as it waits to flush the output buffers. reactor.callLater(0, self.transport.connectionLost, failure.Failure(TCPTimedOutError())) return None self.transport.write('ping' + self.delimiter) self._queued_keepalives += 1 return KeepRunning def reply(self, reply): self.transport.write(reply + self.delimiter) def connectionMade(self): peer = self.transport.getPeer() log.info('Connected to dispatcher at %s:%d' % (peer.host, peer.port)) if RelayConfig.passport is not None: peer_cert = self.transport.getPeerCertificate() if not RelayConfig.passport.accept(peer_cert): - self.transport.loseConnection(CertificateSecurityError('peer certificate not accepted')) + self.transport.loseConnection() self._connection_watcher = RecurrentCall(RelayConfig.keepalive_interval, self._send_keepalive) def connectionLost(self, reason=connectionDone): if self._connection_watcher is not None: self._connection_watcher.cancel() self._connection_watcher = None self._queued_keepalives = 0 def lineReceived(self, line): if line == 'pong': self._queued_keepalives -= 1 return if self.command is None: try: command, seq = line.split() except ValueError: log.error('Could not decode command/sequence number pair from dispatcher: %s' % line) return if command in self.required_headers: self.command = command self.seq = seq self.headers = DecodingDict() else: log.error('Unknown command: %s' % command) self.reply('{} error'.format(seq)) elif line == '': missing_headers = self.required_headers[self.command].difference(self.headers) if missing_headers: for header in missing_headers: log.error('Missing mandatory header %r from %r command' % (header, self.command)) response = 'error' else: # noinspection PyBroadException try: response = self.factory.parent.got_command(self.factory.host, self.command, self.headers) except Exception: log.exception() response = 'error' self.reply('{} {}'.format(self.seq, response)) self.command = None else: try: name, value = line.split(": ", 1) except ValueError: log.error('Unable to parse header: %s' % line) else: try: self.headers[name] = value except DecodingError, e: log.error('Could not decode header: %s' % e) class DispatcherConnectingFactory(ClientFactory): noisy = False protocol = RelayClientProtocol def __init__(self, parent, host, port): self.parent = parent self.host = (host, port) self.delayed = None self.connection_lost = False def __eq__(self, other): return self.host == other.host def clientConnectionFailed(self, connector, reason): log.error('Could not connect to dispatcher at %(host)s:%(port)d (retrying in %%d seconds): %%s' % connector.__dict__ % (RelayConfig.reconnect_delay, reason.value)) if self.parent.connector_needs_reconnect(connector): self.delayed = reactor.callLater(RelayConfig.reconnect_delay, connector.connect) def clientConnectionLost(self, connector, reason): self.cancel_delayed() if reason.type != ConnectionDone: log.error('Connection with dispatcher at %(host)s:%(port)d was lost: %%s' % connector.__dict__ % reason.value) else: log.info('Connection with dispatcher at %(host)s:%(port)d was closed' % connector.__dict__) if self.parent.connector_needs_reconnect(connector): if isinstance(reason.value, CertificateError) or self.connection_lost: self.delayed = reactor.callLater(RelayConfig.reconnect_delay, connector.connect) else: self.delayed = reactor.callLater(min(RelayConfig.reconnect_delay, 1), connector.connect) self.connection_lost = True def buildProtocol(self, addr): self.delayed = reactor.callLater(5, self._connected_successfully) return ClientFactory.buildProtocol(self, addr) def _connected_successfully(self): self.connection_lost = False def cancel_delayed(self): if self.delayed: if self.delayed.active(): self.delayed.cancel() self.delayed = None class SRVMediaRelayBase(object): def __init__(self): self.shutting_down = False self.srv_monitor = RecurrentCall(RelayConfig.dns_check_interval, self._do_lookup) self._do_lookup() def _do_lookup(self): defers = [] for addr, port, is_domain in RelayConfig.dispatchers: if is_domain: defer = lookupService("_sip._udp.%s" % addr) defer.addCallback(self._cb_got_srv, port) defer.addErrback(self._eb_no_srv, addr, port) defers.append(defer) else: defers.append(succeed((addr, port))) defer = DeferredList(defers) defer.addCallback(self._cb_got_all) return KeepRunning def _cb_got_srv(self, (answers, auth, add), port): for answer in answers: if answer.type == dns.SRV and answer.payload and answer.payload.target != dns.Name("."): return str(answer.payload.target), port raise DomainError def _eb_no_srv(self, failure, addr, port): failure.trap(DomainError) return reactor.resolve(addr).addCallback(lambda host: (host, port)).addErrback(self._eb_no_dns, addr) def _eb_no_dns(self, failure, addr): failure.trap(DNSLookupError) log.error("Could resolve neither SRV nor A record for '%s'" % addr) def _cb_got_all(self, results): if not self.shutting_down: dispatchers = [result[1] for result in results if result[0] and result[1] is not None] self.update_dispatchers(dispatchers) def update_dispatchers(self, dispatchers): raise NotImplementedError() def run(self): process.signals.add_handler(signal.SIGHUP, self._handle_signal) process.signals.add_handler(signal.SIGINT, self._handle_signal) process.signals.add_handler(signal.SIGTERM, self._handle_signal) process.signals.add_handler(signal.SIGUSR1, self._handle_signal) reactor.run(installSignalHandlers=False) def stop(self, graceful=False): reactor.callFromThread(self._shutdown, graceful=graceful) def _handle_signal(self, signum, frame): if signum == signal.SIGUSR1: # toggle debugging if log.level.current != log.level.DEBUG: log.level.current = log.level.DEBUG log.info('Switched logging level to DEBUG') else: log.info('Switched logging level to {}'.format(RelayConfig.log_level)) log.level.current = RelayConfig.log_level else: # terminate program signal_map = {signal.SIGTERM: 'Terminated', signal.SIGINT: 'Interrupted', signal.SIGHUP: 'Graceful shutdown'} log.info(signal_map.get(signum, 'Received signal {}, exiting.'.format(signum))) self.stop(graceful=(signum == signal.SIGHUP)) def _shutdown(self, graceful=False): raise NotImplementedError() @staticmethod def _shutdown_done(): reactor.stop() try: from mediaproxy.sipthor import SIPThorMediaRelayBase as MediaRelayBase except ImportError: MediaRelayBase = SRVMediaRelayBase class MediaRelay(MediaRelayBase): def __init__(self): self.cred = X509Credentials(cert_name='relay') self.tls_context = TLSContext(self.cred) self.session_manager = SessionManager(self, RelayConfig.port_range.start, RelayConfig.port_range.end) self.dispatchers = set() self.dispatcher_session_count = {} self.dispatcher_connectors = {} self.old_connectors = {} self.shutting_down = False self.graceful_shutdown = False self.start_time = time() super(MediaRelay, self).__init__() @property def status(self): if self.graceful_shutdown or self.shutting_down: return 'halting' else: return 'active' def update_dispatchers(self, dispatchers): dispatchers = set(dispatchers) for new_dispatcher in dispatchers.difference(self.dispatchers): if new_dispatcher in self.old_connectors.iterkeys(): log.info('Restoring old dispatcher at %s:%d' % new_dispatcher) self.dispatcher_connectors[new_dispatcher] = self.old_connectors.pop(new_dispatcher) else: log.info('Adding new dispatcher at %s:%d' % new_dispatcher) dispatcher_addr, dispatcher_port = new_dispatcher factory = DispatcherConnectingFactory(self, dispatcher_addr, dispatcher_port) self.dispatcher_connectors[new_dispatcher] = reactor.connectTLS(dispatcher_addr, dispatcher_port, factory, self.tls_context) for old_dispatcher in self.dispatchers.difference(dispatchers): log.info('Removing old dispatcher at %s:%d' % old_dispatcher) self.old_connectors[old_dispatcher] = self.dispatcher_connectors.pop(old_dispatcher) self._check_disconnect(old_dispatcher) self.dispatchers = dispatchers def got_command(self, dispatcher, command, headers): if command == 'summary': summary = {'ip': RelayConfig.relay_ip, 'version': __version__, 'status': self.status, 'uptime': int(time() - self.start_time), 'session_count': len(self.session_manager.sessions), 'stream_count': self.session_manager.stream_count, 'bps_relayed': self.session_manager.bps_relayed} return cjson.encode(summary) elif command == 'sessions': return cjson.encode(self.session_manager.statistics) elif command == 'update': if self.graceful_shutdown or self.shutting_down: if not self.session_manager.has_session(**headers): log.info('cannot add new session: media-relay is shutting down') return 'halting' try: local_media = self.session_manager.update_session(dispatcher, **headers) except RelayPortsExhaustedError: log.error('Could not reserve relay ports for session, all allocated ports are being used') return 'error' if local_media: return ' '.join([RelayConfig.advertised_ip or local_media[0][0]] + [str(media[1]) for media in local_media]) else: # command == 'remove' session = self.session_manager.remove_session(**headers) if session is None: return 'error' else: return cjson.encode(session.statistics) def session_expired(self, session): connector = self.dispatcher_connectors.get(session.dispatcher) if connector is None: connector = self.old_connectors.get(session.dispatcher) if connector and connector.state == 'connected': connector.transport.write(' '.join(['expired', cjson.encode(session.statistics)]) + connector.factory.protocol.delimiter) else: log.warning('dispatcher for expired session is no longer online, statistics are lost!') def add_session(self, dispatcher): self.dispatcher_session_count[dispatcher] = self.dispatcher_session_count.get(dispatcher, 0) + 1 def remove_session(self, dispatcher): self.dispatcher_session_count[dispatcher] -= 1 if self.dispatcher_session_count[dispatcher] == 0: del self.dispatcher_session_count[dispatcher] if self.graceful_shutdown and not self.dispatcher_session_count: self._shutdown() elif dispatcher in self.old_connectors: self._check_disconnect(dispatcher) def _check_disconnect(self, dispatcher): connector = self.old_connectors[dispatcher] if self.dispatcher_session_count.get(dispatcher, 0) == 0: old_state = connector.state connector.factory.cancel_delayed() connector.disconnect() if old_state == "disconnected": del self.old_connectors[dispatcher] if self.shutting_down and len(self.dispatcher_connectors) + len(self.old_connectors) == 0: self._shutdown_done() def connector_needs_reconnect(self, connector): if connector in self.dispatcher_connectors.values(): return True else: for dispatcher, old_connector in self.old_connectors.items(): if old_connector is connector: if self.dispatcher_session_count.get(dispatcher, 0) > 0: return True else: del self.old_connectors[dispatcher] break if self.shutting_down: if len(self.old_connectors) == 0: self._shutdown_done() return False def _shutdown(self, graceful=False): if graceful: self.graceful_shutdown = True if self.dispatcher_session_count: return if not self.shutting_down: self.shutting_down = True self.srv_monitor.cancel() self.session_manager.cleanup() if len(self.dispatcher_connectors) + len(self.old_connectors) == 0: self._shutdown_done() else: self.update_dispatchers([])