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How to use subscribe_err method in tavern

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server.py

Source:server.py

1"""2Core module of the Lightstreamer SDK for Python Adapters, containing all3classes (public and private), needed to configure and start the Remote4Adapters.5"""6import socket7import queue8import logging9import time10import os11from multiprocessing import cpu_count12from threading import Thread, Event13from concurrent.futures.thread import ThreadPoolExecutor14from abc import ABCMeta, abstractmethod15import lightstreamer_adapter.protocol as protocol16import lightstreamer_adapter.metadata_protocol as meta_protocol17import lightstreamer_adapter.data_protocol as data_protocol18from lightstreamer_adapter.interfaces.data import (DataProvider,19                                                   SubscribeError,20                                                   DataProviderError)21from lightstreamer_adapter.interfaces.metadata import (Mode,22                                                       MetadataProvider,23                                                       MetadataProviderError)24from lightstreamer_adapter.protocol import RemotingException25from lightstreamer_adapter.subscription import SubscriptionManager, ItemTask26from . import DATA_PROVIDER_LOGGER as DATA_LOGGER27from . import METADATA_PROVIDER_LOGGER as METADATA_LOGGER28__all__ = ['Server', 'DataProviderServer', 'MetadataProviderServer',29           'ExceptionHandler']30def notify(function):31    """Decorator function which add timestamp information to each notification32    sent to the Proxy Adapter.33    """34    def wrap(obj, notification):35        """"Add the timestamp to the supplied notification, in the following36        format:37        <timestamp>|<notification>.38        """39        timestamp = int(round(time.time() * 1000))40        notification = "|".join([str(timestamp), notification])41        function(obj, notification)42    return wrap43def create_socket_and_connect(address, ssl_context=None):44    """Connect to the Proxy Adapter listening on the provided address, and45    return the socket object.46    If an SSLContext is specified, the connection is established by using the47    wrapped socket.48    """49    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)50    if ssl_context is not None:51        hostname = address[0]52        client_socket = ssl_context.wrap_socket(sock, server_hostname=hostname)53    else:54        client_socket = sock55    client_socket.connect(address)56    return client_socket57class _Sender():58    """Helper class which manages the communications from the Remote Adapter to59    the ProxyAdapter, sending data over the "request/replies" or60    "notifications" channels.61    """62    _STOP_WAITING_PILL = "STOP_WAITING_PILL"63    _KEEPALIVE_PILL = "KEEPALIVE_PILL"64    def __init__(self, name, sock, server, keepalive, log):65        self._sock = sock66        self._server = server67        self._name = name68        self._log = log69        self._keepalive = keepalive70        self._keep_alive_log = logging.getLogger(log.name + ".keep_alives")71        self._send_queue = None72        self._send_thread = None73    def start(self):74        """Starts the management of communications from the Remote Adapter to75        the Proxy Adapter.76        """77        # Creates a queue to append incoming replies/notifications to be sent78        # to the ProxyAdapter.79        self._send_queue = queue.Queue()80        # Starts new thread for dequeuing replies/notifications and then81        # sending to the ProxyAdapter.82        self._send_thread = Thread(target=self._do_run, name="Sender-Thread-{}"83                                   .format(self._name))84        self._send_thread.start()85    def send(self, notification):86        """Enqueues a reply or notification to be sent to the Proxy Adapter."""87        self._log.debug("%s Enqueing line: %s", self._name, notification)88        self._send_queue.put(notification)89    def _do_run(self):90        """Target method for the Sender-Thread-XXX, started in the start'91        method."""92        self._log.info("%s starting", self._name)93        while True:94            try:95                to_send = None96                current_log = self._log97                current_log.debug("%s Waiting for a line to send...",98                                  self._name)99                if self._keepalive > 0:100                    try:101                        to_send = self._send_queue.get(timeout=self._keepalive)102                    except queue.Empty:103                        # Keepalive Timeout triggered.104                        to_send = protocol.Method.KEEPALIVE.name105                        current_log = self._keep_alive_log106                else:107                    to_send = self._send_queue.get()108                if to_send == _Sender._STOP_WAITING_PILL:109                    # Request of stopping dequeuing, thread termination.110                    break111                if to_send is None or to_send == _Sender._KEEPALIVE_PILL:112                    to_send = protocol.Method.KEEPALIVE.name113                    current_log = self._keep_alive_log114                # Send to_send over the network.115                current_log.debug("%s Sending line: %s", self._name,  to_send)116                self._sock.sendall(bytes(to_send + '\r\n', 'utf-8'))117            except OSError as err:118                self._server.on_ioexception(err)119                break120        self._log.info("'%s' stopped", self._name)121    def change_keep_alive(self, keepalive, also_interrupt=False):122        self._keepalive = keepalive123        self._log.debug("%s Changing keepalive to: %d", self._name,124                        self._keepalive)125        if also_interrupt:126            # Interrupts the current wait as though a keepalive were needed;127            # in most cases, this keepalive will be redundant128            self._send_queue.put(_Sender._KEEPALIVE_PILL)129    def quit(self):130        """Terminates the communications with the Proxy Adapter."""131        # Enqueues a None item to notify the Sender-Thread-XXX of stopping132        # dequeuing of incoming replies/notifications.133        self._send_queue.put(_Sender._STOP_WAITING_PILL)134        self._send_thread.join()135class _RequestReceiver():136    """Helper class which manages the bi-directional communications with the137    Proxy Adpater counterpart over the "request/replies" channel.138    """139    def __init__(self, sock, keepalive, server):140        self._log = logging.getLogger("lightstreamer-adapter.requestreply"141                                      ".requests")142        self._sock = sock143        self._server = server144        reply_sender_log = logging.getLogger("lightstreamer-adapter."145                                             "requestreply.replies."146                                             "ReplySender")147        self._reply_sender = _Sender(sock=sock, name=self._server.name,148                                     server=self._server,149                                     keepalive=keepalive, log=reply_sender_log)150        self._stop_request = Event()151    def start(self):152        """Starts the management of bidirectional communications with the Proxy153        Adapter: requests coming form the Proxy Adapter, and the responses154        coming from the Remote Adapters.155        """156        # Starts new thread for reading data from the socket.157        thread = Thread(target=self._do_run,158                        name="RequestReceiver-Thread-{}"159                        .format(self._server.name),160                        args=(self._sock,))161        thread.start()162        # Starts the reply sender.163        self._reply_sender.start()164    def _do_run(self, sock):165        """Target method for the RequestReceiver-Thread-XXX, started in the166        'start' method.167        """168        self._log.info("Request receiver '%s' starting...", self._server.name)169        buffer = ''170        while not self._stop_request.is_set():171            try:172                self._log.debug("%s Reading from socket...",173                                self._server.name)174                data = sock.recv(1024)175                self._log.debug("%s Received %d bytes of request data [%s]",176                                self._server.name, len(data), data)177                if not data:178                    raise EOFError('Socket connection broken')179                buffer += data.decode('ascii')180                self._log.debug("%s Current buffer [%s]", self._server.name,181                                buffer)182                tokens = buffer.splitlines(keepends=True)183                buffer = ''184                for token in tokens:185                    if token.endswith('\n'):186                        self._log.debug("%s Request line: %s",187                                        self._server.name, token)188                        self._server.on_received_request(token)189                        buffer = ''190                    else:191                        self._log.debug("'%s' Buffering remaining token %s",192                                        self._server.name, token)193                        buffer = token194            except (OSError, EOFError) as err:195                if self._stop_request.is_set():196                    self._log.debug("'%s' Error raised because of explicitly "197                                    "closed socket, no issue",198                                    self._server.name)199                    break200                # An exception has been raised, due to some issue in the201                # network communication.202                self._server.on_ioexception(err)203                break204        self._log.info("Request receiver '%s' stopped", self._server.name)205    def send_reply(self, request_id, response):206        """Sends a reply to the Proxy Adapter.207        """208        reply = '|'.join((request_id, response))209        self._reply_sender.send(reply)210    def change_keep_alive(self, keepalive):211        self._reply_sender.change_keep_alive(keepalive)212    def quit(self):213        """Terminates the communications with the Proxy Adapter.214        """215        # Issues a request to terminate the 'RequestReceiver-Thread-XXX'216        # thread.217        self._stop_request.set()218        # Issues a request to terminate the associated reply sender.219        self._reply_sender.quit()220class Server(metaclass=ABCMeta):221    """An abstract class meant to be extended, which represents a generic222    Remote Server object, which can run a Remote Data or Metadata Adapter and223    connect it to the Proxy Adapter running on Lightstreamer Server.224    The object should be provided with a suitable Adapter instance and with225    suitable initialization parameters, then activated through its own226    :meth:`start` and finally disposed through its own :meth:`close`. Further227    reuse of the same instance is not supported.228    The Remote Server will take care of sending keepalive packets on the229    connections when needed. The interval can be configured through the230    provider ``keep_alive`` parameter, where a value of 0 or negative means no231    keepalives. By default, it is set to 10 sec.232    However, if a stricter interval is requested by the Proxy Adapter on233    startup, it  will be obeyed (with a safety minimum of 1 second). This234    should ensure that the Proxy Adapter activity checks will always succeed,235    but for some old versions of the Proxy Adapter.236    """237    _DEFAULT_POOL_SIZE = 4238    _STRICT_KEEPALIVE = 1000239    _DEFAULT_KEEPALIVE = 10000240    _MIN_KEEPALIVE = 1000241    # Number of current instances of Server' subclasses.242    _number = 0243    def __init__(self, address, name, keep_alive, thread_pool_size,244                 ssl_context):245        Server._number += 1246        # Logger actually overridden by subclasses.247        self._log = logging.getLogger("lightstreamer-adapter.server")248        self._exception_handler = None249        self._remote_user = None250        self._remote_password = None251        self._close_expected = True252        self._config = {}253        self._config['address'] = address254        self._config['name'] = "#{}".format(Server._number) if (name is255                                                                None) else name256        self._configured_keep_alive = keep_alive * 1000 if (keep_alive is not257                                                            None) else None258        self._config['keep_alive'] = max(0, keep_alive) if (keep_alive is not259                                                            None) else Server._DEFAULT_KEEPALIVE / 1000260        pool = max(0, thread_pool_size) if thread_pool_size is not None else 0261        if pool == 0:262            try:263                self._config['thread_pool_size'] = cpu_count()264            except NotImplementedError:265                self._config['thread_pool_size'] = Server._DEFAULT_POOL_SIZE266        else:267            self._config['thread_pool_size'] = pool268        self._executor = ThreadPoolExecutor(self._config['thread_pool_size'])269        self._server_sock = None270        self._request_receiver = None271        self._ssl_context = ssl_context272    @property273    def name(self):274        """The name, used for logging purposes, associated to the Server275        instance.276        :type: str277        """278        return self._config['name']279    @property280    def keep_alive(self):281        """The keepalive interval expressed in seconds (or fractions)282        :type: float283        """284        return self._config['keep_alive']285    @property286    def remote_user(self):287        """The username credential to be sent to the Proxy Adapter upon288        connection. The credentials are needed only if the Proxy Adapter is289        configured to require Remote Adapter authentication.290        :type: str291        """292        return self._remote_user293    @remote_user.setter294    def remote_user(self, value):295        self._remote_user = value296    @property297    def remote_password(self):298        """The password credential to be sent to the Proxy Adapter upon299        connection. The credentials are needed only if the Proxy Adapter is300        configured to require Remote Adapter authentication.301        :type: str302        """303        return self._remote_password304    @remote_password.setter305    def remote_password(self, value):306        self._remote_password = value307    @property308    def thread_pool_size(self):309        """The thread pool size310        :type: int311        """312        return self._config['thread_pool_size']313    def set_exception_handler(self, handler):314        """Sets the handler for error conditions occurring on the Remote315        Server. By setting the handler, it's possible to override the default316        exception handling.317        :param lightstreamer_adapter.server.ExceptionHandler handler: the318         handler for error conditions occurring on the Remote Server.319        """320        self._exception_handler = handler321    def _on_init(self, subprotocol, params, config_file, data, adapter,322                 invoke_listener=False):323        max_version = '1.8.3'324        parsed_data = subprotocol.read_init(data)325        parsed_data.setdefault(protocol.ARI_VERSION, None)326        parsed_data.setdefault(protocol.KEEPALIVE_HINTS, None)327        proxy_version = parsed_data[protocol.ARI_VERSION]328        keep_alive_hint = parsed_data[protocol.KEEPALIVE_HINTS]329        del parsed_data[protocol.ARI_VERSION]330        del parsed_data[protocol.KEEPALIVE_HINTS]331        try:332            if proxy_version is None:333                proxy_version = '1.8.0'334                self._log.info("Received no Proxy Adapter protocol version "335                               "information; assuming 1.8.0: accepted.")336            elif proxy_version == '1.8.0':337                raise Exception("Unsupported protocol version number: {}"338                                .format(proxy_version))339            elif proxy_version == '1.8.1':340                raise Exception("Unsupported reserved protocol version "341                                "number: {}".format(proxy_version))342            elif proxy_version == '1.8.2':343                self._log.info("Received Proxy Adapter protocol version as %s "344                               "for %s: accepted downgrade.", proxy_version,345                               self.name)346            elif proxy_version == max_version:347                self._log.info("Received Proxy Adapter protocol version as %s "348                               "for %s: versions match", proxy_version,349                               self.name)350            else:351                proxy_version = max_version352                self._log.info("Received Proxy Adapter protocol version as %s "353                               "for %s: requesting %s", proxy_version,354                               self.name, max_version)355            if params is not None:356                init_params = params.copy()357                parsed_data.update(init_params)358            adapter.initialize(parsed_data, config_file)359            if invoke_listener is True:360                adapter.set_listener(self)361        except Exception as err:362            res = subprotocol.write_init(exception=err)363        else:364            proxy_parameters = None365            if proxy_version in ('1.8.0', '1.8.2'):366                self._close_expected = False367            if proxy_version != '1.8.0':368                proxy_parameters = {}369                proxy_parameters[protocol.ARI_VERSION] = proxy_version370            res = subprotocol.write_init(proxy_parameters)371        self._use_keep_alive_hint(keep_alive_hint)372        return res373    def _use_keep_alive_hint(self, keepalive_hint=None):374        if keepalive_hint is None:375            # No information provided, we stick to a stricter default376            if self._configured_keep_alive is None:377                self._log.info("Keepalive time for %s finally set to %d "378                               "milliseconds to support old Proxy Adapter",379                               self.name, self._STRICT_KEEPALIVE)380                self._change_keep_alive(Server._STRICT_KEEPALIVE)381            # else:382                # For backward compatibility we keep the setting; it is383                # possible that the setting is too long and the Proxy Adapter384                # activity check is triggered385        else:386            keepalive_time = float(keepalive_hint)387            if keepalive_time <= 0:388                pass389                # No restrictions, so our default is still meaningful390            elif self._configured_keep_alive is None:391                if keepalive_time < Server._DEFAULT_KEEPALIVE:392                    if keepalive_time >= Server._MIN_KEEPALIVE:393                        self._log.info("Keepalive time for %s finally set to "394                                       "%d milliseconds as per Proxy Adapter "395                                       "suggestion", self.name, keepalive_time)396                        self._change_keep_alive(keepalive_time)397                    else:398                        self._log.warning("Keepalive time for %s finally set "399                                          "to %d milliseconds, despite a Proxy"400                                          " Adapter suggestion of %d "401                                          "milliseconds", self.name,402                                          Server._MIN_KEEPALIVE,403                                          keepalive_time)404                        self._change_keep_alive(Server._MIN_KEEPALIVE)405                else:406                    # The default setting is stricter, so it's ok407                    self._log.info("Keepalive time for %s finally confirmed to"408                                   " %d milliseconds consistently with Proxy "409                                   "Adapter suggestion", self.name,410                                   Server._DEFAULT_KEEPALIVE)411            elif self._configured_keep_alive > 0:412                if keepalive_time < self._configured_keep_alive:413                    if keepalive_time >= Server._MIN_KEEPALIVE:414                        self._log.warning("Keepalive time for %s changed to %d"415                                          " milliseconds as per Proxy Adapter "416                                          "suggestion", self.name,417                                          keepalive_time)418                        self._change_keep_alive(keepalive_time)419                    else:420                        self._log.warning("Keepalive time for %s changed to %d"421                                          " milliseconds, despite a Proxy "422                                          "Adapter suggestion of %d "423                                          "milliseconds", self.name,424                                          Server._MIN_KEEPALIVE,425                                          keepalive_time)426                        self._change_keep_alive(Server._MIN_KEEPALIVE)427                else:428                    # Our setting is stricter, so it's ok429                    pass430            else:431                if keepalive_time >= Server._MIN_KEEPALIVE:432                    self._log.warning("Keepalives for %s forced with time %d "433                                      "milliseconds as per Proxy Adapter "434                                      "suggestion", self.name, keepalive_time)435                    self._change_keep_alive(keepalive_time)436                else:437                    self._log.warning("Keepalives for %s forced with time %d "438                                      "milliseconds, despite a Proxy Adapter "439                                      "suggestion of %d milliseconds",440                                      self.name, Server._MIN_KEEPALIVE,441                                      keepalive_time)442    def _change_keep_alive(self, keep_alive_milliseconds):443        keep_alive_seconds = keep_alive_milliseconds / 1000444        self._config['keep_alive'] = keep_alive_seconds445        self._request_receiver.change_keep_alive(keep_alive_seconds)446    @abstractmethod447    def start(self):448        """Starts the Remote Adapter. A connection to the Proxy Adapter is449        performed (as soon as one is available). Then, requests issued by450        the Proxy Adapter are received and forwarded to the Remote Adapter.451        """452        if self.keep_alive > 0:453            self._log.info("Keepalive time for %s set to %d seconds",454                           self.name, self.keep_alive)455        else:456            self._log.info("Keepalive for %s disabled", self.name)457        self._server_sock = create_socket_and_connect(self._config['address'],458                                                      self._ssl_context)459        # Creates and starts the Request Receiver.460        self._request_receiver = _RequestReceiver(sock=self._server_sock,461                                                  keepalive=self.keep_alive,462                                                  server=self)463        self._request_receiver.start()464        # Invokes hook to notify subclass that the Request Receiver has been465        # started.466        self._on_request_receiver_started()467        self._send_remote_credentials()468    def close(self):469        """Stops the management of the Remote Adapter and destroys the threads470        used by this Server. This instance can no longer be used.471        Note that this does not stop the supplied Remote Adapter, as no close472        method is available in the Remote Adapter interface. If the process is473        not terminating, then the Remote Adapter cleanup should be performed by474        accessing the supplied Adapter instance directly and calling custom475        methods.476        """477        self._request_receiver.quit()478        self._executor.shutdown()479        self._server_sock.close()480    def on_received_request(self, request):481        """Invoked when the RequestReceiver gets a new request coming from the482        Proxy Adapter.483        This method takes the responsibility to proceed with a first484        coarse-grained parsing, to identify the three main components of the485        packet structure, as follows:486        <ID>|<method>|<data>487         |      |       |488         |      |     The arguments to be passed to the method489         |      |490         |   The method to invoke on the Remote Adapter491         |492        The Request Id493        Once parsed, the request is then dispatched to the subclass for later494        management.495        """496        try:497            parsed_request = protocol.parse_request(request)498            if parsed_request is None:499                self._log.warning("Discarding malformed request: %s", request)500                return501            request_id = parsed_request["id"]502            method_name = parsed_request["method"]503            data = parsed_request["data"]504            self._handle_received_request(request_id, data, method_name)505        except RemotingException as err:506            self.on_exception(err)507    def _handle_received_request(self, request_id, data, method_name):508        close_request = method_name == str(protocol.Method.CLOSE)509        if close_request and self._close_expected:510            if request_id != '0':511                raise RemotingException("Unexpected id found while parsing a {}"512                                        "request".format(method_name))513            close_data = protocol.read_close(data)514            close_data.setdefault(protocol.KEY_CLOSE_REASON, None)515            closed_reason = close_data[protocol.KEY_CLOSE_REASON]516            if closed_reason is not None:517                self._log.info("Close requested by the counterpart with "518                                        "reason: %s", closed_reason)519            self.close()520            return521        self._handle_request(request_id, data, method_name)522    def _send_reply(self, request_id, response):523        self._log.debug("Sending reply for request: %s", request_id)524        self._request_receiver.send_reply(request_id, response)525    def on_ioexception(self, ioexception):526        """Called by the Remote Server upon a read or write operation failure.527        See documentation from the ExceptionHandler.handle_io exception method528        for further details.529        """530        if self._exception_handler is not None:531            self._log.info("Caught exception: %s, notifying the "532                           "application...", str(ioexception))533            # Enable default handling in case the exception handler534            # returns False.535            if not self._exception_handler.handle_ioexception(ioexception):536                return537        self._handle_ioexception(ioexception)538    def on_exception(self, exception):539        """Called by the Remote Server upon an unexpected error.540        See documentation from the ExceptionHandler.handle_exception method for541        further details.542        """543        if self._exception_handler is not None:544            self._log.info("Caught exception: %s, notifying the "545                           "application...", str(exception))546            # Enable default handling in case the exception handler547            # returns False.548            if not self._exception_handler.handle_exception(exception):549                return550        self._handle_exception(exception)551    @abstractmethod552    def _handle_ioexception(self, ioexception):553        os._exit(1)554        return False555    def _handle_exception(self, exception):556        pass557    @abstractmethod558    def _on_request_receiver_started(self):559        """Hook method to notify the subclass that the Request Receiver has560        been started.561        This method is intended to be overridden by subclasses.562        """563    @abstractmethod564    def _handle_request(self, request_id, data, method_name):565        """Intended to be overridden by subclasses, invoked for handling the566        received request, already splitted into the supplied parameters.567        """568    @abstractmethod569    def _send_remote_credentials(self):570        """Intended to be overridden by subclasses, invoked for sending the571        remote credentials to the Proxy Adapter.572        """573class MetadataProviderServer(Server):574    """A Remote Server object which can run a Remote Metadata Adapter and575    connect it to the Proxy Adapter running on Lightstreamer Server.576    The object should be provided with a MetadataProvider instance and with577    suitable initialization parameters and established connections,578    then activated through :meth:`MetadataProviderServer.start` and finally579    disposed through :meth:`Server.close`.580    Further reuse of the same instance is not supported.581    By default, the invocations to the Metadata Adapter methods will be done in582    a limited thread pool with a size determined by the number of detected cpu583    cores. The size can be specified through the provided ``thread_pool_size``584    parameter. A size of 1 enforces strictly sequential invocations and can be585    used if parallelization of the calls is not supported by the Metadata586    Adapter. A value of 0, negative or ``None`` also implies the default587    behaviour as stated above.588    Note that requests with an implicit ordering, like589    :meth:`lightstreamer_adapter.interfaces.metadata.MetadataProvider.notify_new_session`590    and591    :meth:`lightstreamer_adapter.interfaces.metadata.MetadataProvider.notify_session_close`592    for the same session, are always guaranteed to be and sequentialized in the593    right way, although they may not occur in the same thread.594    """595    def __init__(self, adapter, address, name=None, keep_alive=None,596                 thread_pool_size=0, ssl_context=None):597        """Creates a server with the supplied configuration parameters. The598        :meth:`lightstreamer_adapter.interfaces.metadata.MetadataProvider.initialize`599        method will be invoked only upon a Proxy Adapter request.600        :param lightstreamer_adapter.interfaces.metadata.MetadataProvider \601        adapter: the Remote Metadata Adapter instance to be run.602        :param tuple address: the address of the Proxy Adapter supplied as a603         2-tuple ``(host, request_reply_port)`` where:604         * host: a string representing the hostname or the IP address605         * request_reply_port: an int representing the request/reply port606        :param str name: the name associated to the Server instance.607        :param float keep_alive: the keepalive interval expressed in seconds608         (or fractions)609        :param int thread_pool_size: the thread pool size610        :param SSLContext ssl_context: the SSL context to be used in the case611         of encrypted communications with the Proxy Adapter612        :raises TypeError: if the supplied Remote Adapter is not an instance of613         a subclass of614         :class:`lightstreamer_adapter.interfaces.metadata.MetadataProvider`.615        """616        super(MetadataProviderServer, self).__init__(address, name, keep_alive,617                                                     thread_pool_size,618                                                     ssl_context)619        if not isinstance(adapter, MetadataProvider):620            raise TypeError("The provided adapter is not a subclass of "621                            "lightstreamer_adapter.interfaces."622                            "MetadataProvider")623        self._config_file = None624        self._params = None625        self._adapter = adapter626        self.init_expected = True627    def _send_remote_credentials(self):628        """Invoked for sending the remote credentials to the Proxy Metadata629        Adapter.630        """631        unsolicited_message = protocol.write_credentials(self.remote_user,632                                                         self.remote_password)633        self._send_reply("1", unsolicited_message)634    def _on_request_receiver_started(self):635        """Invoked to notify this subclass the the Request Receiver has been636        started.637        This class has a void implementation.638        """639    def _handle_request(self, request_id, data, method_name):640        init_request = method_name == str(meta_protocol.Method.MPI)641        if init_request and not self.init_expected:642            raise RemotingException("Unexpected late {} request"643                                    .format(str(meta_protocol.Method.MPI)))644        if not init_request and self.init_expected:645            raise RemotingException("Unexpected request {} while waiting for "646                                    "{} request"647                                    .format(method_name,648                                            meta_protocol.Method.MPI))649        if init_request:650            self.init_expected = False651            res = self._on_mpi(data)652            self._send_reply(request_id, res)653            return654        # Builds the name of the method_name do be invoked, starting from the655        # protocol method_name name, and retrieves such method_name.656        on_method_name = "_on_" + method_name.lower()657        try:658            on_method = getattr(self, on_method_name)659        except AttributeError:660            METADATA_LOGGER.warning("Discarding unknown request: %s",661                                    method_name)662            return663        # Invokes the retrieved method, which in turn returns an asynchronous664        # function to be executed through the executor.665        async_func = on_method(data)666        # Define a task function to wrap the execution of the returned667        # async_func and the sending of the gotten reply.668        def execute_and_reply():669            try:670                # async_func may raise again a RemotingExcption, which need671                # to be caught and forwarded to the ExceptionHandler.672                reply = async_func()673                self._send_reply(request_id, reply)674            except RemotingException as err:675                self.on_exception(err)676        # Submits the task to the executor for asynchronous execution.677        self._executor.submit(execute_and_reply)678    def _on_mpi(self, data):679        return self._on_init(meta_protocol, self._params, self._config_file,680                             data, self._adapter)681    def _on_nus(self, data):682        parsed_data = meta_protocol.read_notify_user(data)683        user = parsed_data["user"]684        password = parsed_data["password"]685        http_headers = parsed_data["httpHeaders"]686        def execute():687            try:688                self._adapter.notify_user(user, password, http_headers)689                max_bandwidth = self._adapter.get_allowed_max_bandwidth(user)690                wants_tb_ntf = self._adapter.wants_tables_notification(user)691            except Exception as err:692                res = meta_protocol.write_notiy_user(meta_protocol.Method.NUS,693                                                     exception=err)694            else:695                res = meta_protocol.write_notiy_user(meta_protocol.Method.NUS,696                                                     max_bandwidth,697                                                     wants_tb_ntf)698            return res699        return execute700    def _on_nua(self, data):701        parsed_data = meta_protocol.read_notify_user_auth(data)702        user = parsed_data["user"]703        http_headers = parsed_data["httpHeaders"]704        password = parsed_data["password"]705        client_principal = parsed_data["clientPrincipal"]706        def execute():707            try:708                self._adapter.notify_user_with_principal(user, password,709                                                         http_headers,710                                                         client_principal)711                max_bandwidth = self._adapter.get_allowed_max_bandwidth(user)712                wants_tb_notify = self._adapter.wants_tables_notification(user)713            except Exception as err:714                res = meta_protocol.write_notiy_user(meta_protocol.Method.NUA,715                                                     exception=err)716            else:717                res = meta_protocol.write_notiy_user(meta_protocol.Method.NUA,718                                                     max_bandwidth,719                                                     wants_tb_notify)720            return res721        return execute722    def _on_nns(self, data):723        parsed_data = meta_protocol.read_notify_new_session(data)724        session_id = parsed_data["session_id"]725        user = parsed_data["user"]726        client_context = parsed_data["clientContext"]727        def execute():728            try:729                self._adapter.notify_new_session(user,730                                                 session_id,731                                                 client_context)732                res = meta_protocol.write_notify_new_session()733            except Exception as err:734                res = meta_protocol.write_notify_new_session(err)735            return res736        return execute737    def _on_nsc(self, data):738        session_id = meta_protocol.read_notifiy_session_close(data)739        def execute():740            try:741                self._adapter.notify_session_close(session_id)742            except Exception as err:743                res = meta_protocol.write_notify_session_close(err)744            else:745                res = meta_protocol.write_notify_session_close()746            return res747        return execute748    def _on_gis(self, data):749        parsed_data = meta_protocol.read_get_items(data)750        session_id = parsed_data["session_id"]751        user = parsed_data["user"]752        group = parsed_data["group"]753        def execute():754            try:755                items = self._adapter.get_items(user, session_id, group)756                if not items:757                    METADATA_LOGGER.warning("None or empty field list from "758                                            "get_items for group '%s'", group)759            except Exception as err:760                res = meta_protocol.write_get_items(exception=err)761            else:762                res = meta_protocol.write_get_items(items)763            return res764        return execute765    def _on_gsc(self, data):766        parsed_data = meta_protocol.read_get_schema(data)767        session_id = parsed_data["session_id"]768        group = parsed_data["group"]769        user = parsed_data["user"]770        schema = parsed_data["schema"]771        def execute():772            try:773                fields = self._adapter.get_schema(user, session_id, group,774                                                  schema)775                if not fields:776                    METADATA_LOGGER.warning("None or empty field list from "777                                            "get_schema for schema '%s' in "778                                            "group '%s'", schema, group)779            except Exception as err:780                res = meta_protocol.write_get_schema(exception=err)781            else:782                res = meta_protocol.write_get_schema(fields)783            return res784        return execute785    def _on_git(self, data):786        parsed_data = meta_protocol.read_get_item_data(data)787        def execute():788            try:789                items = [{"allowedModeList":790                          [mode for mode in list(Mode)791                           if self._adapter.mode_may_be_allowed(item, mode)],792                          "distinctSnapshotLength":793                          self._adapter.get_distinct_snapshot_length(item),794                          "minSourceFrequency":795                          self._adapter.get_min_source_frequency(item)}796                         for item in parsed_data]797            except Exception as err:798                res = meta_protocol.write_get_item_data(exception=err)799            else:800                res = meta_protocol.write_get_item_data(items)801            return res802        return execute803    def _on_gui(self, data):804        parsed_data = meta_protocol.read_get_user_item_data(data)805        user = parsed_data["user"]806        user_items = parsed_data["items"]807        def execute():808            try:809                items = [{"allowedModeList":810                          [mode for mode in list(Mode)811                           if self._adapter.ismode_allowed(user, item, mode)],812                          "allowedBufferSize":813                          self._adapter.get_allowed_buffer_size(user, item),814                          "allowedMaxFrequency":815                          self._adapter.get_allowed_max_item_frequency(user,816                                                                       item)}817                         for item in user_items]818            except Exception as err:819                res = meta_protocol.write_get_user_item_data(exception=err)820            else:821                res = meta_protocol.write_get_user_item_data(items)822            return res823        return execute824    def _on_num(self, data):825        parsed_data = meta_protocol.read_notify_user_message(data)826        session_id = parsed_data["session_id"]827        message = parsed_data["message"]828        user = parsed_data["user"]829        def execute():830            try:831                self._adapter.notify_user_message(user, session_id, message)832            except Exception as err:833                res = meta_protocol.write_notify_user_message(err)834            else:835                res = meta_protocol.write_notify_user_message()836            return res837        return execute838    def _on_nnt(self, data):839        parsed_data = meta_protocol.read_notify_new_tables(data)840        session_id = parsed_data["session_id"]841        user = parsed_data["user"]842        table_infos = parsed_data["tableInfos"]843        def execute():844            try:845                self._adapter.notify_new_tables(user, session_id, table_infos)846            except Exception as err:847                res = meta_protocol.write_notify_new_tables(err)848            else:849                res = meta_protocol.write_notify_new_tables()850            return res851        return execute852    def _on_ntc(self, data):853        data = meta_protocol.read_notify_tables_close(data)854        table_infos = data["tableInfos"]855        session_id = data["session_id"]856        def execute():857            try:858                self._adapter.notify_tables_close(session_id, table_infos)859            except Exception as err:860                res = meta_protocol.write_notify_tables_close(err)861            else:862                res = meta_protocol.write_notify_tables_close()863            return res864        return execute865    def _on_mda(self, data):866        parsed_data = meta_protocol.read_notify_device_access(data)867        mpn_device_info = parsed_data["mpnDeviceInfo"]868        session_id = parsed_data["sessionId"]869        user = parsed_data["user"]870        def execute():871            try:872                self._adapter.notify_mpn_device_access(user, session_id,873                                                       mpn_device_info)874            except Exception as err:875                res = meta_protocol.write_notify_device_acces(err)876            else:877                res = meta_protocol.write_notify_device_acces()878            return res879        return execute880    def _on_msa(self, data):881        parsed_data = meta_protocol.read_subscription_activation(data)882        session_id = parsed_data["session_id"]883        table = parsed_data["table"]884        subscription = parsed_data["subscription"]885        user = parsed_data["user"]886        def execute():887            try:888                self._adapter.notify_mpn_subscription_activation(user,889                                                                 session_id,890                                                                 table,891                                                                 subscription)892            except Exception as err:893                res = meta_protocol.write_subscription_activation(err)894            else:895                res = meta_protocol.write_subscription_activation()896            return res897        return execute898    def _on_mdc(self, data):899        parsed_data = meta_protocol.read_device_token_change(data)900        session_id = parsed_data["sessionId"]901        mpn_device_info = parsed_data["mpnDeviceInfo"]902        user = parsed_data["user"]903        new_device_toksn = parsed_data["newDeviceToken"]904        def execute():905            try:906                self._adapter.notify_mpn_device_token_change(user,907                                                             session_id,908                                                             mpn_device_info,909                                                             new_device_toksn)910            except Exception as err:911                res = meta_protocol.write_device_token_change(err)912            else:913                res = meta_protocol.write_device_token_change()914            return res915        return execute916    def _handle_ioexception(self, ioexception):917        METADATA_LOGGER.fatal("Exception caught while reading/writing from/to"918                              " network: <%s>, aborting...", str(ioexception))919        super(MetadataProviderServer, self)._handle_ioexception(ioexception)920    def _handle_exception(self, exception):921        METADATA_LOGGER.error("Caught exception: %s", str(exception))922        return False923    @property924    def adapter_config(self):925        """The pathname of an optional configuration file for the Remote926        Metadata Adapter, to be passed to the927        :meth:`lightstreamer_adapter.interfaces.metadata.MetadataProvider.initialize`928        method.929        :Getter: Returns the pathname of the optional configuration file930        :Setter: Sets the pathname of the optional configuration file931        :type: str932        """933        return self._config_file934    @adapter_config.setter935    def adapter_config(self, value):936        self._config_file = value937    @property938    def adapter_params(self):939        """A dictionary object to be passed to the940        :meth:`lightstreamer_adapter.interfaces.metadata.MetadataProvider.initialize`941        method, to supply optional parameters.942        :Getter: Returns the dictionary object of optional parameters943        :Setter: Sets the dictionary object of optional parameters944        :type: dict945        """946        return self._params947    @adapter_params.setter948    def adapter_params(self, value):949        self._params = value950    def start(self):951        """Starts the Remote Metadata Adapter. A connection to the Proxy952        Adapter is performed (as soon as one is available). Then, requests953        issued by the Proxy Adapter are received and forwarded to the Remote954        Adapter.955        :raises \956        lightstreamer_adapter.interfaces.metadata.MetadataProviderError: If an957         error occurred in the initialization phase. The adapter was not958         started.959        """960        METADATA_LOGGER.info("Managing Metadata Adapter %s with a thread pool"961                             " size of %d", self.name, self.thread_pool_size)962        try:963            super(MetadataProviderServer, self).start()964        except (TypeError, OSError) as err:965            raise MetadataProviderError("Caught an error during the "966                                        "initialization phase") from err967class DataProviderServer(Server):968    """A Remote Server object which can run a Remote Data Adapter and connect969    it to the Proxy Adapter running on Lightstreamer Server.970    The object should be provided with a DataProvider instance and with971    suitable initialization parameters and established connections, then972    activated through :meth:`DataProviderServer.start()` and finally disposed973    through :meth:`Server.close()`.974    Further reuse of the same instance is not supported.975    By default, the invocations to the Data Adapter methods will be done in976    a limited thread pool with a size determined by the number of detected cpu977    cores. The size can be specified through the provided978    ``thread_pool_size`` parameter. A size of 1 enforces strictly sequential979    invocations and can be used if parallelization of the calls is not980    supported by the Metadata Adapter. A value of 0, negative or ``None`` also981    implies the default behaviour as stated above.982    Note that :meth:`.subscribe` and :meth:`.unsubscribe` invocations for the983    same item are always guaranteed to be sequentialized in the right way,984    although they may not occur in the same thread.985    """986    def __init__(self, adapter, address, name=None, keep_alive=None,987                 thread_pool_size=0, ssl_context=None):988        """Creates a server with the supplied configuration parameters. The989        initialize method of the Remote Adapter will be invoked only upon a990        Proxy Adapter request.991        :param lightstreamer_adapter.interfaces.data.DataProvider adapter: The992         Remote Adapter instance to be run.993        :param tuple address: the address of the Proxy Adapter supplied as a994         3-tuple ``(host, request_reply_port, notify_port)`` where:995         * host: a string representing the hostname or the IP address996         * request_reply_port: an int representing the request/reply port997         * notify_port: an int representing the notify port998        :param str name: the name associated to the Server instance.999        :param float keep_alive: the keepalive interval expressed in seconds1000         (or fractions)1001        :param int thread_pool_size: the thread pool size1002        :param SSLContext ssl_context: the SSL context to be used in the1003         case of encrypted communications with the Proxy Adapter1004        :raises TypeError: if the supplied Remote Adapter is not an instance of1005         a subclass of1006         :class:`lightstreamer_adapter.interfaces.data.DataProvider`.1007        """1008        super(DataProviderServer, self).__init__((address[0], address[1]),1009                                                 name,1010                                                 keep_alive,1011                                                 thread_pool_size,1012                                                 ssl_context)1013        if not isinstance(adapter, DataProvider):1014            raise TypeError("The provided adapter is not a subclass of "1015                            "lightstreamer_adapter.interfaces.DataProvider")1016        self._config_file = None1017        self._params = None1018        self._adapter = adapter1019        self._subscription_mgr = SubscriptionManager(self._executor)1020        self.init_expected = True1021        self._notify_sender = None1022        self._notify_address = (address[0], address[2])1023        self._ntfy_sock = None1024    def _send_remote_credentials(self):1025        """Invoked for sending the remote credentials to the Proxy Metadata1026        Adapter.1027        """1028        unsolicited_message = protocol.write_credentials(self.remote_user,1029                                                         self.remote_password)1030        self._send_reply("1", unsolicited_message)1031        self._send_notify(unsolicited_message)1032    def _handle_request(self, request_id, data, method_name):1033        init_request = method_name == str(data_protocol.Method.DPI)1034        if init_request and not self.init_expected:1035            raise RemotingException("Unexpected late {} request"1036                                    .format(str(data_protocol.Method.DPI)))1037        if not init_request and self.init_expected:1038            raise RemotingException("Unexpected request {} while waiting for "1039                                    "{} request"1040                                    .format(method_name,1041                                            data_protocol.Method.DPI))1042        if init_request:1043            self.init_expected = False1044            res = self._on_dpi(data)1045            self._send_reply(request_id, res)1046        elif method_name == "SUB":1047            self._on_sub(request_id, data)1048        elif method_name == "USB":1049            self._on_usb(request_id, data)1050        else:1051            DATA_LOGGER.warning("Discarding unknown request: %s", method_name)1052    @property1053    def adapter_config(self):1054        """The pathname of an optional configuration file for the Remote1055        Data Adapter, to be passed to the1056        :meth:`lightstreamer_adapter.interfaces.data.DataProvider.initialize`1057        method.1058        :Getter: Returns the pathname of the optional configuration file1059        :Setter: Sets the pathname of the optional configuration file1060        :type: str1061        """1062        return self._config_file1063    @adapter_config.setter1064    def adapter_config(self, value):1065        self._config_file = value1066    @property1067    def adapter_params(self):1068        """A dictionary object to be passed to the1069        :meth:`lightstreamer_adapter.interfaces.data.DataProvider.initialize`1070        method, to supply optional parameters.1071        :Getter: Returns the dictionary object of optional parameters1072        :Setter: Sets the dictionary object of optional parameters1073        :type: dict1074        """1075        return self._params1076    @adapter_params.setter1077    def adapter_params(self, value):1078        self._params = value1079    def _on_request_receiver_started(self):1080        """Invoked to notify this subclass the the Request Receiver has been1081        started.1082        This class creates an additional socket to enable the communication1083        from the Remote Data Adapter to the Proxy Adapter, in order to send1084        data over the notification channel.1085        """1086        self._ntfy_sock = create_socket_and_connect(self._notify_address,1087                                                    self._ssl_context)1088        notify_sender_log = logging.getLogger("lightstreamer-adapter."1089                                              "requestreply.notifications."1090                                              "NotifySender")1091        self._notify_sender = _Sender(sock=self._ntfy_sock, server=self,1092                                      name=self.name + " (Notify)",1093                                      keepalive=self.keep_alive,1094                                      log=notify_sender_log)1095        self._notify_sender.start()1096    def _on_dpi(self, data):1097        return self._on_init(data_protocol, self._params, self._config_file,1098                             data, self._adapter, True)1099    def _on_sub(self, request_id, data):1100        item_name = data_protocol.read_sub(data)1101        def do_task():1102            DATA_LOGGER.debug("Processing SUB request: %s", request_id)1103            success = False1104            try:1105                snpt_available = self._adapter.issnapshot_available(item_name)1106                if snpt_available is False:1107                    self.end_of_snapshot(item_name)1108                self._adapter.subscribe(item_name)1109                success = True1110            except Exception as err:1111                res = data_protocol.write_sub(err)1112            else:1113                res = data_protocol.write_sub()1114            self._send_reply(request_id, res)1115            return success1116        def do_late_task():1117            DATA_LOGGER.info("Skipping request: %s", request_id)1118            subscribe_err = SubscribeError("Subscribe request come too late")1119            res = data_protocol.write_sub(subscribe_err)1120            return res1121        sub_task = ItemTask(request_id, True, do_task, do_late_task)1122        self._subscription_mgr.do_subscription(item_name, sub_task)1123    def _on_usb(self, request_id, data):1124        item_name = data_protocol.read_usub(data)1125        def do_task():1126            DATA_LOGGER.debug("Processing USB request: %s", request_id)1127            success = False1128            try:1129                self._adapter.unsubscribe(item_name)1130                success = True1131            except Exception as err:1132                res = data_protocol.write_unsub(err)1133            else:1134                res = data_protocol.write_unsub()1135            self._send_reply(request_id, res)1136            return success1137        def do_late_task():1138            DATA_LOGGER.info("Skipping request: %s", request_id)1139            res = data_protocol.write_unsub()1140            self._send_reply(request_id, res)1141        unsub_task = ItemTask(request_id, False, do_task, do_late_task)1142        self._subscription_mgr.do_unsubscription(item_name, unsub_task)1143    @notify1144    def _send_notify(self, ntfy):1145        self._notify_sender.send(ntfy)1146    def update(self, item_name, events_map, issnapshot):1147        request_id = self._subscription_mgr.get_active_item(item_name)1148        if request_id:1149            try:1150                res = data_protocol.write_update_map(item_name, request_id,1151                                                     issnapshot, events_map)1152                self._send_notify(res)1153            except RemotingException as err:1154                self.on_exception(err)1155        else:1156            DATA_LOGGER.warning("Unexpected update for item_name %s",1157                                item_name)1158    def end_of_snapshot(self, item_name):1159        request_id = self._subscription_mgr.get_active_item(item_name)1160        if request_id:1161            try:1162                res = data_protocol.write_eos(item_name, request_id)1163                self._send_notify(res)1164            except RemotingException as err:1165                self.on_exception(err)1166        else:1167            DATA_LOGGER.warning("Unexpected end_of_snapshot notify for "1168                                "item_name %s", item_name)1169    def clear_snapshot(self, item_name):1170        request_id = self._subscription_mgr.get_active_item(item_name)1171        if request_id:1172            try:1173                res = data_protocol.write_cls(item_name, request_id)1174                self._send_notify(res)1175            except RemotingException as err:1176                self.on_exception(err)1177        else:1178            DATA_LOGGER.warning("Unexpected clear_snapshot for item_name %s",1179                                item_name)1180    def failure(self, exception):1181        try:1182            res = data_protocol.write_failure(exception)1183            self._send_notify(res)1184        except RemotingException as err:1185            self.on_exception(err)1186    def _handle_ioexception(self, ioexception):1187        DATA_LOGGER.fatal("Exception caught while reading/writing from/to "1188                          "network: <%s>, aborting...", str(ioexception))1189        super(DataProviderServer, self)._handle_ioexception(ioexception)1190    def _handle_exception(self, exception):1191        DATA_LOGGER.error("Caught exception: %s, trying to notify a "1192                          "failure...", str(exception))1193        try:1194            res = data_protocol.write_failure(exception)1195            self._send_notify(res)1196        except RemotingException:1197            DATA_LOGGER.exception("Caught second-level exception while trying"1198                                  " to notify a first-level exception")1199        return False1200    def _change_keep_alive(self, keep_alive_milliseconds):1201        super(DataProviderServer, self)._change_keep_alive(keep_alive_milliseconds)1202        self._notify_sender.change_keep_alive(keep_alive_milliseconds / 1000, True)1203    def start(self):1204        """Starts the Remote Data Adapter. A connection to the Proxy Adapter is1205        performed (as soon as one is available). Then, requests issued by the1206        Proxy Adapter are received and forwarded to the Remote Adapter.1207        :raises lightstreamer_adapter.interfaces.data.DataProviderError: If an1208         error occurred in the initialization phase. The adapter was not1209         started.1210        """1211        DATA_LOGGER.info("Managing Data Adapter %s with a thread pool size of"1212                         " %d", self.name, self.thread_pool_size)1213        try:1214            super(DataProviderServer, self).start()1215        except (TypeError, OSError) as err:1216            raise DataProviderError("Caught an error during the "1217                                    "initialization phase") from err1218    def close(self):1219        """Stops the management of the Remote Data Adapter attached to this1220        Server object.1221        The method first invokes the inherited Server.close() and then closes1222        the Notify Sender object.1223        """1224        super(DataProviderServer, self).close()1225        self._ntfy_sock.close()1226        self._notify_sender.quit()1227class ExceptionHandler(metaclass=ABCMeta):1228    """An abstract class meant to to be implemented in order to provide a1229    Remote Server instance with a custom handler for error conditions occurring1230    on the     Remote Server.1231    Note that multiple redundant invocations on the same Remote Server instance1232    are possible.1233    """1234    def __init__(self):1235        pass1236    def handle_ioexception(self, exception):1237        """Called by the Remote Server upon a read or write operation failure.1238        This may mean that the connection to Lightstreamer Server is lost; in1239        any way, after this error, the correct operation of this Remote Server1240        operation is compromised.1241        This can be the signal of a normal termination of Lightstreamer Server.1242        If this is not the case, then this Remote Server should be closed and a1243        new one should be created and initialized. This may mean closing and1244        restarting the process or just creating a new instance, depending on1245        the implementation choice. This will be detected by the Proxy Adapter,1246        which will react accordingly.1247        The default handling just terminates the process.1248        :param Exception exception: An Exception showing the cause of the1249         problem.1250        :return bool: ``True`` to enable the default handling, false to1251         suppress it.1252        """1253    def handle_exception(self, exception):1254        """Called by the Remote Server upon an unexpected error. After this1255        error, the correct operation of this Remote Server instance is1256        compromised.1257        If this is the case, then this Remote Server instance should be closed1258        and a new one should be created and initialized. This may mean closing1259        and restarting the process or just creating a new instance, depending1260        on the implementation choice. This will be detected by the Proxy1261        Adapter, which will react accordingly.1262        The default handling, in case of a Remote Data Adapter, issues an1263        asynchronous failure notification to the Proxy Adapter.1264        In case of a Remote Metadata Adapter, the default handling ignores the1265        notification; however, as a consequence of the Remote Protocol being1266        broken, the Proxy Adapter may return exceptions against one or more1267        specific requests by Lightstreamer Kernel.1268        :param Exception exception: An Exception showing the cause of the1269         problem.1270        :return: ``True`` to enable the default handling, false to1271         suppress it.1272        :rtype: bool...

test_mqtt.py

Source:test_mqtt.py

...114        MQTTClient.subscribe(mock_client, "abc")115        assert mock_client._subscribed[123].topic == "abc"116        assert mock_client._subscribed[123].subscribed == False117    def test_no_subscribe_on_err(self):118        def subscribe_err(topic, *args, **kwargs):119            return (1, 123)120        mock_client = TestSubscription.get_mock_client_with(subscribe_err)121        MQTTClient.subscribe(mock_client, "abc")122        assert mock_client._subscribed == {}123    def test_no_subscribe_on_unrecognised_suback(self):124        def subscribe_success(topic, *args, **kwargs):125            return (0, 123)126        mock_client = TestSubscription.get_mock_client_with(subscribe_success)127        MQTTClient._on_subscribe(mock_client, "abc", {}, 123, 0)...

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