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How to use user_classes_count method in locust

Best Python code snippet using locust

test_runners.py

Source:test_runners.py

...355        runner.start(user_count=5, spawn_rate=5, wait=False)356        runner.spawning_greenlet.join()357        self.assertDictEqual({"MyUser1": 3, "MyUser2": 2}, runner.user_classes_count)358        runner.quit()359    def test_user_classes_count(self):360        class MyUser1(User):361            wait_time = constant(0)362            @task363            def my_task(self):364                pass365        class MyUser2(User):366            wait_time = constant(0)367            @task368            def my_task(self):369                pass370        environment = Environment(user_classes=[MyUser1, MyUser2])371        runner = LocalRunner(environment)372        runner.start(user_count=10, spawn_rate=5, wait=False)373        runner.spawning_greenlet.join()...

runners.py

Source:runners.py

...126        :returns: Number of currently running users127        """128        return len(self.user_greenlets)129    @property130    def user_classes_count(self) -> Dict[str, int]:131        """132        :returns: Number of currently running users for each user class133        """134        user_classes_count = {user_class.__name__: 0 for user_class in self.user_classes}135        for user_greenlet in self.user_greenlets:136            try:137                user = user_greenlet.args[0]138            except IndexError:139                # TODO: Find out why args is sometimes empty. In gevent code,140                #       the supplied args are cleared in the gevent.greenlet.Greenlet.__free,141                #       so it seems a good place to start investigating. My suspicion is that142                #       the supplied args are emptied whenever the greenlet is dead, so we can143                #       simply ignore the greenlets with empty args.144                logger.debug(145                    "ERROR: While calculating number of running users, we encountered a user that didnt have proper args %s (user_greenlet.dead=%s)",146                    user_greenlet,147                    user_greenlet.dead,148                )149                continue150            user_classes_count[user.__class__.__name__] += 1151        return user_classes_count152    def update_state(self, new_state):153        """154        Updates the current state155        """156        # I (cyberwiz) commented out this logging, because it is too noisy even for debug level157        # Uncomment it if you are specifically debugging state transitions158        # logger.debug("Updating state to '%s', old state was '%s'" % (new_state, self.state))159        self.state = new_state160    def cpu_log_warning(self):161        """Called at the end of the test to repeat the warning & return the status"""162        if self.cpu_warning_emitted:163            logger.warning(164                "CPU usage was too high at some point during the test! See https://docs.locust.io/en/stable/running-locust-distributed.html for how to distribute the load over multiple CPU cores or machines"165            )166            return True167        return False168    def spawn_users(self, user_classes_spawn_count: Dict[str, int], wait: bool = False):169        if self.state == STATE_INIT or self.state == STATE_STOPPED:170            self.update_state(STATE_SPAWNING)171        logger.debug(172            "Spawning additional %s (%s already running)..."173            % (json.dumps(user_classes_spawn_count), json.dumps(self.user_classes_count))174        )175        def spawn(user_class: str, spawn_count: int):176            n = 0177            while n < spawn_count:178                new_user = self.user_classes_by_name[user_class](self.environment)179                new_user.start(self.user_greenlets)180                n += 1181                if n % 10 == 0 or n == spawn_count:182                    logger.debug("%i users spawned" % self.user_count)183            logger.debug("All users of class %s spawned" % user_class)184        for user_class, spawn_count in user_classes_spawn_count.items():185            spawn(user_class, spawn_count)186        if wait:187            self.user_greenlets.join()188            logger.info("All users stopped\n")189    def stop_users(self, user_classes_stop_count: Dict[str, int]):190        async_calls_to_stop = Group()191        stop_group = Group()192        for user_class, stop_count in user_classes_stop_count.items():193            if self.user_classes_count[user_class] == 0:194                continue195            to_stop = []196            for user_greenlet in self.user_greenlets:197                if len(to_stop) == stop_count:198                    break199                try:200                    user = user_greenlet.args[0]201                except IndexError:202                    logger.error(203                        "While stopping users, we encountered a user that didnt have proper args %s", user_greenlet204                    )205                    continue206                if isinstance(user, self.user_classes_by_name[user_class]):207                    to_stop.append(user)208            if not to_stop:209                continue210            while True:211                user_to_stop: User = to_stop.pop()212                logger.debug("Stopping %s" % user_to_stop.greenlet.name)213                if user_to_stop.greenlet is greenlet.getcurrent():214                    # User called runner.quit(), so don't block waiting for killing to finish215                    user_to_stop.group.killone(user_to_stop.greenlet, block=False)216                elif self.environment.stop_timeout:217                    async_calls_to_stop.add(gevent.spawn_later(0, user_to_stop.stop, force=False))218                    stop_group.add(user_to_stop.greenlet)219                else:220                    async_calls_to_stop.add(gevent.spawn_later(0, user_to_stop.stop, force=True))221                if not to_stop:222                    break223        async_calls_to_stop.join()224        if not stop_group.join(timeout=self.environment.stop_timeout):225            logger.info(226                "Not all users finished their tasks & terminated in %s seconds. Stopping them..."227                % self.environment.stop_timeout228            )229            stop_group.kill(block=True)230        logger.debug(231            "%g users have been stopped, %g still running", sum(user_classes_stop_count.values()), self.user_count232        )233    def monitor_cpu(self):234        process = psutil.Process()235        while True:236            self.current_cpu_usage = process.cpu_percent()237            if self.current_cpu_usage > 90 and not self.cpu_warning_emitted:238                logging.warning(239                    "CPU usage above 90%! This may constrain your throughput and may even give inconsistent response time measurements! See https://docs.locust.io/en/stable/running-locust-distributed.html for how to distribute the load over multiple CPU cores or machines"240                )241                self.cpu_warning_emitted = True242            gevent.sleep(CPU_MONITOR_INTERVAL)243    def start(self, user_count: int, spawn_rate: float, wait: bool = False):244        """245        Start running a load test246        :param user_count: Total number of users to start247        :param spawn_rate: Number of users to spawn per second248        :param wait: If True calls to this method will block until all users are spawned.249                     If False (the default), a greenlet that spawns the users will be250                     started and the call to this method will return immediately.251        """252        if self.state != STATE_RUNNING and self.state != STATE_SPAWNING:253            self.stats.clear_all()254            self.exceptions = {}255            self.cpu_warning_emitted = False256            self.worker_cpu_warning_emitted = False257            self.environment.events.test_start.fire(environment=self.environment)258        if wait and user_count - self.user_count > spawn_rate:259            raise ValueError("wait is True but the amount of users to add is greater than the spawn rate")260        for user_class in self.user_classes:261            if self.environment.host is not None:262                user_class.host = self.environment.host263        if self.state != STATE_INIT and self.state != STATE_STOPPED:264            self.update_state(STATE_SPAWNING)265        if self._users_dispatcher is None:266            self._users_dispatcher = UsersDispatcher(267                worker_nodes=[self._local_worker_node], user_classes=self.user_classes268            )269        logger.info("Ramping to %d users at a rate of %.2f per second" % (user_count, spawn_rate))270        self._users_dispatcher.new_dispatch(user_count, spawn_rate)271        try:272            for dispatched_users in self._users_dispatcher:273                user_classes_spawn_count = {}274                user_classes_stop_count = {}275                user_classes_count = dispatched_users[self._local_worker_node.id]276                logger.debug("Ramping to %s" % _format_user_classes_count_for_log(user_classes_count))277                for user_class, user_class_count in user_classes_count.items():278                    if self.user_classes_count[user_class] > user_class_count:279                        user_classes_stop_count[user_class] = self.user_classes_count[user_class] - user_class_count280                    elif self.user_classes_count[user_class] < user_class_count:281                        user_classes_spawn_count[user_class] = user_class_count - self.user_classes_count[user_class]282                if wait:283                    # spawn_users will block, so we need to call stop_users first284                    self.stop_users(user_classes_stop_count)285                    self.spawn_users(user_classes_spawn_count, wait)286                else:287                    # call spawn_users before stopping the users since stop_users288                    # can be blocking because of the stop_timeout289                    self.spawn_users(user_classes_spawn_count, wait)290                    self.stop_users(user_classes_stop_count)291                self._local_worker_node.user_classes_count = next(iter(dispatched_users.values()))292        except KeyboardInterrupt:293            # TODO: Find a cleaner way to handle that294            # We need to catch keyboard interrupt. Otherwise, if KeyboardInterrupt is received while in295            # a gevent.sleep inside the dispatch_users function, locust won't gracefully shutdown.296            self.quit()297        logger.info("All users spawned: %s" % _format_user_classes_count_for_log(self.user_classes_count))298        self.environment.events.spawning_complete.fire(user_count=sum(self.target_user_classes_count.values()))299    def start_shape(self):300        if self.shape_greenlet:301            logger.info("There is an ongoing shape test running. Editing is disabled")302            return303        logger.info("Shape test starting. User count and spawn rate are ignored for this type of load test")304        self.update_state(STATE_INIT)305        self.shape_greenlet = self.greenlet.spawn(self.shape_worker)306        self.shape_greenlet.link_exception(greenlet_exception_handler)307        self.environment.shape_class.reset_time()308    def shape_worker(self):309        logger.info("Shape worker starting")310        while self.state == STATE_INIT or self.state == STATE_SPAWNING or self.state == STATE_RUNNING:311            new_state = self.environment.shape_class.tick()312            if new_state is None:313                logger.info("Shape test stopping")314                if self.environment.parsed_options and self.environment.parsed_options.headless:315                    self.quit()316                else:317                    self.stop()318                self.shape_greenlet = None319                self.shape_last_state = None320                return321            elif self.shape_last_state == new_state:322                gevent.sleep(1)323            else:324                user_count, spawn_rate = new_state325                logger.info("Shape test updating to %d users at %.2f spawn rate" % (user_count, spawn_rate))326                # TODO: This `self.start()` call is blocking until the ramp-up is completed. This can leads327                #       to unexpected behaviours such as the one in the following example:328                #       A load test shape has the following stages:329                #           stage 1: (user_count=100, spawn_rate=1) for t < 50s330                #           stage 2: (user_count=120, spawn_rate=1) for t < 100s331                #           stage 3: (user_count=130, spawn_rate=1) for t < 120s332                #        Because the first stage will take 100s to complete, the second stage333                #        will be skipped completely because the shape worker will be blocked334                #        at the `self.start()` of the first stage.335                #        Of couse, this isn't a problem if the load test shape is well-defined.336                #        We should probably use a `gevent.timeout` with a duration a little over337                #        `(user_count - prev_user_count) / spawn_rate` in order to limit the runtime338                #        of each load test shape stage.339                self.start(user_count=user_count, spawn_rate=spawn_rate)340                self.shape_last_state = new_state341    def stop(self):342        """343        Stop a running load test by stopping all running users344        """345        if self.state == STATE_STOPPED:346            return347        logger.debug("Stopping all users")348        self.update_state(STATE_CLEANUP)349        # if we are currently spawning users we need to kill the spawning greenlet first350        if self.spawning_greenlet and not self.spawning_greenlet.ready():351            self.spawning_greenlet.kill(block=True)352        if self.environment.shape_class is not None and self.shape_greenlet is not greenlet.getcurrent():353            # If the test was not started yet and locust is354            # stopped/quit, shape_greenlet will be None.355            if self.shape_greenlet is not None:356                self.shape_greenlet.kill(block=True)357                self.shape_greenlet = None358            self.shape_last_state = None359        self.stop_users(self.user_classes_count)360        self.update_state(STATE_STOPPED)361        self.cpu_log_warning()362        self.environment.events.test_stop.fire(environment=self.environment)363    def quit(self):364        """365        Stop any running load test and kill all greenlets for the runner366        """367        self.stop()368        self.greenlet.kill(block=True)369    def log_exception(self, node_id, msg, formatted_tb):370        key = hash(formatted_tb)371        row = self.exceptions.setdefault(key, {"count": 0, "msg": msg, "traceback": formatted_tb, "nodes": set()})372        row["count"] += 1373        row["nodes"].add(node_id)374        self.exceptions[key] = row375    @property376    def target_user_count(self) -> int:377        return sum(self.target_user_classes_count.values())378    def register_message(self, msg_type, listener):379        """380        Register a listener for a custom message from another node381        :param msg_type: The type of the message to listen for382        :param listener: The function to execute when the message is received383        """384        self.custom_messages[msg_type] = listener385class LocalRunner(Runner):386    """387    Runner for running single process load test388    """389    def __init__(self, environment):390        """391        :param environment: Environment instance392        """393        super().__init__(environment)394        # register listener thats logs the exception for the local runner395        def on_user_error(user_instance, exception, tb):396            formatted_tb = "".join(traceback.format_tb(tb))397            self.log_exception("local", str(exception), formatted_tb)398        self.environment.events.user_error.add_listener(on_user_error)399    def start(self, user_count: int, spawn_rate: float, wait: bool = False):400        if spawn_rate > 100:401            logger.warning(402                "Your selected spawn rate is very high (>100), and this is known to sometimes cause issues. Do you really need to ramp up that fast?"403            )404        if self.spawning_greenlet:405            # kill existing spawning_greenlet before we start a new one406            self.spawning_greenlet.kill(block=True)407        self.spawning_greenlet = self.greenlet.spawn(408            lambda: super(LocalRunner, self).start(user_count, spawn_rate, wait=wait)409        )410        self.spawning_greenlet.link_exception(greenlet_exception_handler)411    def stop(self):412        if self.state == STATE_STOPPED:413            return414        super().stop()415    def send_message(self, msg_type, data=None):416        """417        Emulates internodal messaging by calling registered listeners418        :param msg_type: The type of the message to emulate sending419        :param data: Optional data to include420        """421        logger.debug(f"Running locally: sending {msg_type} message to self")422        if msg_type in self.custom_messages:423            listener = self.custom_messages[msg_type]424            msg = Message(msg_type, data, "local")425            listener(environment=self.environment, msg=msg)426        else:427            logger.warning(f"Unknown message type recieved: {msg_type}")428class DistributedRunner(Runner):429    def __init__(self, *args, **kwargs):430        super().__init__(*args, **kwargs)431        self._local_worker_node = None432        setup_distributed_stats_event_listeners(self.environment.events, self.stats)433class WorkerNode:434    def __init__(self, id: str, state=STATE_INIT, heartbeat_liveness=HEARTBEAT_LIVENESS):435        self.id: str = id436        self.state = state437        self.heartbeat = heartbeat_liveness438        self.cpu_usage = 0439        self.cpu_warning_emitted = False440        # The reported users running on the worker441        self.user_classes_count: Dict[str, int] = {}442    @property443    def user_count(self) -> int:444        return sum(self.user_classes_count.values())445class WorkerNodes(MutableMapping):446    def __init__(self):447        self._worker_nodes = {}448    def get_by_state(self, state) -> List[WorkerNode]:449        return [c for c in self.values() if c.state == state]450    @property451    def all(self) -> ValuesView[WorkerNode]:452        return self.values()453    @property454    def ready(self) -> List[WorkerNode]:455        return self.get_by_state(STATE_INIT)456    @property457    def spawning(self) -> List[WorkerNode]:458        return self.get_by_state(STATE_SPAWNING)459    @property460    def running(self) -> List[WorkerNode]:461        return self.get_by_state(STATE_RUNNING)462    @property463    def missing(self) -> List[WorkerNode]:464        return self.get_by_state(STATE_MISSING)465    def __setitem__(self, k: str, v: WorkerNode) -> None:466        self._worker_nodes[k] = v467    def __delitem__(self, k: str) -> None:468        del self._worker_nodes[k]469    def __getitem__(self, k: str) -> WorkerNode:470        return self._worker_nodes[k]471    def __len__(self) -> int:472        return len(self._worker_nodes)473    def __iter__(self) -> Iterator[WorkerNode]:474        return iter(self._worker_nodes)475class MasterRunner(DistributedRunner):476    """477    Runner used to run distributed load tests across multiple processes and/or machines.478    MasterRunner doesn't spawn any user greenlets itself. Instead it expects479    :class:`WorkerRunners <WorkerRunner>` to connect to it, which it will then direct480    to start and stop user greenlets. Stats sent back from the481    :class:`WorkerRunners <WorkerRunner>` will aggregated.482    """483    def __init__(self, environment, master_bind_host, master_bind_port):484        """485        :param environment: Environment instance486        :param master_bind_host: Host/interface to use for incoming worker connections487        :param master_bind_port: Port to use for incoming worker connections488        """489        super().__init__(environment)490        self.worker_cpu_warning_emitted = False491        self.master_bind_host = master_bind_host492        self.master_bind_port = master_bind_port493        self.spawn_rate: float = 0494        self.clients = WorkerNodes()495        try:496            self.server = rpc.Server(master_bind_host, master_bind_port)497        except RPCError as e:498            if e.args[0] == "Socket bind failure: Address already in use":499                port_string = (500                    master_bind_host + ":" + str(master_bind_port) if master_bind_host != "*" else str(master_bind_port)501                )502                logger.error(503                    f"The Locust master port ({port_string}) was busy. Close any applications using that port - perhaps an old instance of Locust master is still running? ({e.args[0]})"504                )505                sys.exit(1)506            else:507                raise508        self._users_dispatcher: Union[UsersDispatcher, None] = None509        self.greenlet.spawn(self.heartbeat_worker).link_exception(greenlet_exception_handler)510        self.greenlet.spawn(self.client_listener).link_exception(greenlet_exception_handler)511        # listener that gathers info on how many users the worker has spawned512        def on_worker_report(client_id, data):513            if client_id not in self.clients:514                logger.info("Discarded report from unrecognized worker %s", client_id)515                return516            self.clients[client_id].user_classes_count = data["user_classes_count"]517        self.environment.events.worker_report.add_listener(on_worker_report)518        # register listener that sends quit message to worker nodes519        def on_quitting(environment, **kw):520            self.quit()521        self.environment.events.quitting.add_listener(on_quitting)522    @property523    def user_count(self) -> int:524        return sum(c.user_count for c in self.clients.values())525    def cpu_log_warning(self):526        warning_emitted = Runner.cpu_log_warning(self)527        if self.worker_cpu_warning_emitted:528            logger.warning("CPU usage threshold was exceeded on workers during the test!")529            warning_emitted = True530        return warning_emitted531    def start(self, user_count: int, spawn_rate: float, **kwargs) -> None:532        num_workers = len(self.clients.ready) + len(self.clients.running) + len(self.clients.spawning)533        if not num_workers:534            logger.warning(535                "You are running in distributed mode but have no worker servers connected. "536                "Please connect workers prior to swarming."537            )538            return539        for user_class in self.user_classes:540            if self.environment.host is not None:541                user_class.host = self.environment.host542        self.spawn_rate = spawn_rate543        if self._users_dispatcher is None:544            self._users_dispatcher = UsersDispatcher(545                worker_nodes=list(self.clients.values()), user_classes=self.user_classes546            )547        logger.info(548            "Sending spawn jobs of %d users at %.2f spawn rate to %d ready clients"549            % (user_count, spawn_rate, num_workers)550        )551        worker_spawn_rate = float(spawn_rate) / (num_workers or 1)552        if worker_spawn_rate > 100:553            logger.warning(554                "Your selected spawn rate is very high (>100/worker), and this is known to sometimes cause issues. Do you really need to ramp up that fast?"555            )556        if self.state != STATE_RUNNING and self.state != STATE_SPAWNING:557            self.stats.clear_all()558            self.exceptions = {}559            self.environment.events.test_start.fire(environment=self.environment)560            if self.environment.shape_class:561                self.environment.shape_class.reset_time()562        self.update_state(STATE_SPAWNING)563        self._users_dispatcher.new_dispatch(target_user_count=user_count, spawn_rate=spawn_rate)564        try:565            for dispatched_users in self._users_dispatcher:566                dispatch_greenlets = Group()567                for worker_node_id, worker_user_classes_count in dispatched_users.items():568                    data = {569                        "timestamp": time.time(),570                        "user_classes_count": worker_user_classes_count,571                        "host": self.environment.host,572                        "stop_timeout": self.environment.stop_timeout,573                        "parsed_options": vars(self.environment.parsed_options)574                        if self.environment.parsed_options575                        else {},576                    }577                    dispatch_greenlets.add(578                        gevent.spawn_later(579                            0,580                            self.server.send_to_client,581                            Message("spawn", data, worker_node_id),582                        )583                    )584                dispatched_user_count = sum(map(sum, map(methodcaller("values"), dispatched_users.values())))585                logger.debug(586                    "Sending spawn messages for %g total users to %i client(s)",587                    dispatched_user_count,588                    len(dispatch_greenlets),589                )590                dispatch_greenlets.join()591                logger.debug(592                    "Currently spawned users: %s" % _format_user_classes_count_for_log(self.reported_user_classes_count)593                )594            self.target_user_classes_count = _aggregate_dispatched_users(dispatched_users)595        except KeyboardInterrupt:596            # TODO: Find a cleaner way to handle that597            # We need to catch keyboard interrupt. Otherwise, if KeyboardInterrupt is received while in598            # a gevent.sleep inside the dispatch_users function, locust won't gracefully shutdown.599            self.quit()600        # Wait a little for workers to report their users to the master601        # so that we can give an accurate log message below and fire the `spawning_complete` event602        # when the user count is really at the desired value.603        timeout = gevent.Timeout(self._wait_for_workers_report_after_ramp_up())604        timeout.start()605        try:606            while self.user_count != self.target_user_count:607                gevent.sleep()608        except gevent.Timeout:609            pass610        finally:611            timeout.cancel()612        self.environment.events.spawning_complete.fire(user_count=sum(self.target_user_classes_count.values()))613        logger.info("All users spawned: %s" % _format_user_classes_count_for_log(self.reported_user_classes_count))614    @functools.lru_cache()615    def _wait_for_workers_report_after_ramp_up(self) -> float:616        """617        The amount of time to wait after a ramp-up in order for all the workers to report their state618        to the master. If not supplied by the user, it is 100ms by default. If the supplied value is a number,619        it is taken as-is. If the supplied value is a pattern like "some_number * WORKER_REPORT_INTERVAL",620        the value will be "some_number * WORKER_REPORT_INTERVAL". The most sensible value would be something621        like "1.25 * WORKER_REPORT_INTERVAL". However, some users might find it too high, so it is left622        to a really small value of 100ms by default.623        """624        locust_wait_for_workers_report_after_ramp_up = os.getenv("LOCUST_WAIT_FOR_WORKERS_REPORT_AFTER_RAMP_UP")625        if locust_wait_for_workers_report_after_ramp_up is None:626            return 0.1627        match = re.search(628            r"^(?P<coeff>(\d+)|(\d+\.\d+))[ ]*\*[ ]*WORKER_REPORT_INTERVAL$",629            locust_wait_for_workers_report_after_ramp_up,630        )631        if match is None:632            assert float(locust_wait_for_workers_report_after_ramp_up) >= 0633            return float(locust_wait_for_workers_report_after_ramp_up)634        else:635            return float(match.group("coeff")) * WORKER_REPORT_INTERVAL636    def stop(self, send_stop_to_client: bool = True):637        if self.state not in [STATE_INIT, STATE_STOPPED, STATE_STOPPING]:638            logger.debug("Stopping...")639            self.update_state(STATE_STOPPING)640            if self.environment.shape_class is not None and self.shape_greenlet is not greenlet.getcurrent():641                self.shape_greenlet.kill(block=True)642                self.shape_greenlet = None643                self.shape_last_state = None644            self._users_dispatcher = None645            if send_stop_to_client:646                for client in self.clients.all:647                    logger.debug("Sending stop message to client %s" % client.id)648                    self.server.send_to_client(Message("stop", None, client.id))649                # Give an additional 60s for all workers to stop650                timeout = gevent.Timeout(self.environment.stop_timeout or 0 + 60)651                timeout.start()652                try:653                    while self.user_count != 0:654                        gevent.sleep(1)655                except gevent.Timeout:656                    logger.error("Timeout waiting for all workers to stop")657                finally:658                    timeout.cancel()659            self.environment.events.test_stop.fire(environment=self.environment)660    def quit(self):661        self.stop(send_stop_to_client=False)662        logger.debug("Quitting...")663        for client in self.clients.all:664            logger.debug("Sending quit message to client %s" % (client.id))665            self.server.send_to_client(Message("quit", None, client.id))666        gevent.sleep(0.5)  # wait for final stats report from all workers667        self.greenlet.kill(block=True)668    def check_stopped(self):669        if (670            not self.state == STATE_INIT671            and not self.state == STATE_STOPPED672            and all(map(lambda x: x.state not in (STATE_RUNNING, STATE_SPAWNING, STATE_INIT), self.clients.all))673        ):674            self.update_state(STATE_STOPPED)675    def heartbeat_worker(self):676        while True:677            gevent.sleep(HEARTBEAT_INTERVAL)678            if self.connection_broken:679                self.reset_connection()680                continue681            for client in self.clients.all:682                if client.heartbeat < 0 and client.state != STATE_MISSING:683                    logger.info("Worker %s failed to send heartbeat, setting state to missing." % str(client.id))684                    client.state = STATE_MISSING685                    client.user_classes_count = {}686                    if self._users_dispatcher is not None:687                        self._users_dispatcher.remove_worker(client)688                        # TODO: If status is `STATE_RUNNING`, call self.start()689                    if self.worker_count <= 0:690                        logger.info("The last worker went missing, stopping test.")691                        self.stop()692                        self.check_stopped()693                else:694                    client.heartbeat -= 1695    def reset_connection(self):696        logger.info("Reset connection to worker")697        try:698            self.server.close()699            self.server = rpc.Server(self.master_bind_host, self.master_bind_port)700        except RPCError as e:701            logger.error("Temporary failure when resetting connection: %s, will retry later." % (e))702    def client_listener(self):703        while True:704            try:705                client_id, msg = self.server.recv_from_client()706            except RPCError as e:707                logger.error("RPCError found when receiving from client: %s" % (e))708                self.connection_broken = True709                gevent.sleep(FALLBACK_INTERVAL)710                continue711            self.connection_broken = False712            msg.node_id = client_id713            if msg.type == "client_ready":714                if not msg.data:715                    logger.error(f"An old (pre 2.0) worker tried to connect ({client_id}). That's not going to work.")716                    continue717                elif msg.data != __version__ and msg.data != -1:718                    logger.warning(719                        f"A worker ({client_id}) running a different version ({msg.data}) connected, master version is {__version__}"720                    )721                worker_node_id = msg.node_id722                self.clients[worker_node_id] = WorkerNode(worker_node_id, heartbeat_liveness=HEARTBEAT_LIVENESS)723                if self._users_dispatcher is not None:724                    self._users_dispatcher.add_worker(worker_node=self.clients[worker_node_id])725                    if not self._users_dispatcher.dispatch_in_progress and self.state == STATE_RUNNING:726                        # TODO: Test this situation727                        self.start(self.target_user_count, self.spawn_rate)728                logger.info(729                    "Client %r reported as ready. Currently %i clients ready to swarm."730                    % (worker_node_id, len(self.clients.ready + self.clients.running + self.clients.spawning))731                )732                # if self.state == STATE_RUNNING or self.state == STATE_SPAWNING:733                #     # TODO: Necessary now that UsersDispatcher handles that?734                #     # balance the load distribution when new client joins735                #     self.start(self.target_user_count, self.spawn_rate)736                # emit a warning if the worker's clock seem to be out of sync with our clock737                # if abs(time() - msg.data["time"]) > 5.0:738                #    warnings.warn("The worker node's clock seem to be out of sync. For the statistics to be correct the different locust servers need to have synchronized clocks.")739            elif msg.type == "client_stopped":740                client = self.clients[msg.node_id]741                del self.clients[msg.node_id]742                if self._users_dispatcher is not None:743                    self._users_dispatcher.remove_worker(client)744                    if not self._users_dispatcher.dispatch_in_progress and self.state == STATE_RUNNING:745                        # TODO: Test this situation746                        self.start(self.target_user_count, self.spawn_rate)747                logger.info("Removing %s client from running clients" % (msg.node_id))748            elif msg.type == "heartbeat":749                if msg.node_id in self.clients:750                    c = self.clients[msg.node_id]751                    c.heartbeat = HEARTBEAT_LIVENESS752                    client_state = msg.data["state"]753                    if c.state == STATE_MISSING:754                        logger.info(755                            "Worker %s self-healed with heartbeat, setting state to %s." % (str(c.id), client_state)756                        )757                        if self._users_dispatcher is not None:758                            self._users_dispatcher.add_worker(worker_node=c)759                            if not self._users_dispatcher.dispatch_in_progress and self.state == STATE_RUNNING:760                                # TODO: Test this situation761                                self.start(self.target_user_count, self.spawn_rate)762                    c.state = client_state763                    c.cpu_usage = msg.data["current_cpu_usage"]764                    if not c.cpu_warning_emitted and c.cpu_usage > 90:765                        self.worker_cpu_warning_emitted = True  # used to fail the test in the end766                        c.cpu_warning_emitted = True  # used to suppress logging for this node767                        logger.warning(768                            "Worker %s exceeded cpu threshold (will only log this once per worker)" % (msg.node_id)769                        )770            elif msg.type == "stats":771                self.environment.events.worker_report.fire(client_id=msg.node_id, data=msg.data)772            elif msg.type == "spawning":773                self.clients[msg.node_id].state = STATE_SPAWNING774            elif msg.type == "spawning_complete":775                self.clients[msg.node_id].state = STATE_RUNNING776                self.clients[msg.node_id].user_classes_count = msg.data["user_classes_count"]777            elif msg.type == "quit":778                if msg.node_id in self.clients:779                    client = self.clients[msg.node_id]780                    del self.clients[msg.node_id]781                    if self._users_dispatcher is not None:782                        self._users_dispatcher.remove_worker(client)783                        if not self._users_dispatcher.dispatch_in_progress and self.state == STATE_RUNNING:784                            # TODO: Test this situation785                            self.start(self.target_user_count, self.spawn_rate)786                    logger.info(787                        "Client %r quit. Currently %i clients connected." % (msg.node_id, len(self.clients.ready))788                    )789                    if self.worker_count - len(self.clients.missing) <= 0:790                        logger.info("The last worker quit, stopping test.")791                        self.stop()792                        if self.environment.parsed_options and self.environment.parsed_options.headless:793                            self.quit()794            elif msg.type == "exception":795                self.log_exception(msg.node_id, msg.data["msg"], msg.data["traceback"])796            elif msg.type in self.custom_messages:797                logger.debug(f"Recieved {msg.type} message from worker {msg.node_id}")798                self.custom_messages[msg.type](environment=self.environment, msg=msg)799            else:800                logger.warning(f"Unknown message type recieved from worker {msg.node_id}: {msg.type}")801            self.check_stopped()802    @property803    def worker_count(self):804        return len(self.clients.ready) + len(self.clients.spawning) + len(self.clients.running)805    @property806    def reported_user_classes_count(self) -> Dict[str, int]:807        reported_user_classes_count = defaultdict(lambda: 0)808        for client in self.clients.ready + self.clients.spawning + self.clients.running:809            for name, count in client.user_classes_count.items():810                reported_user_classes_count[name] += count811        return reported_user_classes_count812    def send_message(self, msg_type, data=None, client_id=None):813        """814        Sends a message to attached worker node(s)815        :param msg_type: The type of the message to send816        :param data: Optional data to send817        :param client_id: Optional id of the target worker node.818                            If None, will send to all attached workers819        """820        if client_id:...

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