feat: splits the work loop into a bootstrap method (#1816)

rq/worker.py

@@ -679,36 +679,23 @@ class Worker:
         """
         pass
 
-    def work(
+    def bootstrap(
         self,
-        burst: bool = False,
         logging_level: str = "INFO",
         date_format: str = DEFAULT_LOGGING_DATE_FORMAT,
         log_format: str = DEFAULT_LOGGING_FORMAT,
-        max_jobs: Optional[int] = None,
-        with_scheduler: bool = False,
-    ) -> bool:
-        """Starts the work loop.
-
-        Pops and performs all jobs on the current list of queues.  When all
-        queues are empty, block and wait for new jobs to arrive on any of the
-        queues, unless `burst` mode is enabled.
-
-        The return value indicates whether any jobs were processed.
+    ):
+        """Bootstraps the worker.
+        Runs the basic tasks that should run when the worker actually starts working.
+        Used so that new workers can focus on the work loop implementation rather
+        than the full bootstraping process.
 
         Args:
-            burst (bool, optional): Whether to work on burst mode. Defaults to False.
             logging_level (str, optional): Logging level to use. Defaults to "INFO".
             date_format (str, optional): Date Format. Defaults to DEFAULT_LOGGING_DATE_FORMAT.
             log_format (str, optional): Log Format. Defaults to DEFAULT_LOGGING_FORMAT.
-            max_jobs (Optional[int], optional): Max number of jobs. Defaults to None.
-            with_scheduler (bool, optional): Whether to run the scheduler in a separate process. Defaults to False.
-
-        Returns:
-            worked (bool): Will return True if any job was processed, False otherwise.
         """
         setup_loghandlers(logging_level, date_format, log_format)
-        completed_jobs = 0
         self.register_birth()
         self.log.info("Worker %s: started, version %s", self.key, VERSION)
         self.subscribe()
@@ -716,7 +703,26 @@ class Worker:
         qnames = self.queue_names()
         self.log.info('*** Listening on %s...', green(', '.join(qnames)))
 
-        if with_scheduler:
+    def _start_scheduler(
+        self,
+        burst: bool = False,
+        logging_level: str = "INFO",
+        date_format: str = DEFAULT_LOGGING_DATE_FORMAT,
+        log_format: str = DEFAULT_LOGGING_FORMAT,
+    ):
+        """Starts the scheduler process.
+        This is specifically designed to be run by the worker when running the `work()` method.
+        Instanciates the RQScheduler and tries to acquire a lock.
+        If the lock is acquired, start scheduler.
+        If worker is on burst mode just enqueues scheduled jobs and quits,
+        otherwise, starts the scheduler in a separate process.
+
+        Args:
+            burst (bool, optional): Whether to work on burst mode. Defaults to False.
+            logging_level (str, optional): Logging level to use. Defaults to "INFO".
+            date_format (str, optional): Date Format. Defaults to DEFAULT_LOGGING_DATE_FORMAT.
+            log_format (str, optional): Log Format. Defaults to DEFAULT_LOGGING_FORMAT.
+        """
         self.scheduler = RQScheduler(
             self.queues,
             connection=self.connection,
@@ -726,16 +732,46 @@ class Worker:
             serializer=self.serializer,
         )
         self.scheduler.acquire_locks()
-            # If lock is acquired, start scheduler
         if self.scheduler.acquired_locks:
-                # If worker is run on burst mode, enqueue_scheduled_jobs()
-                # before working. Otherwise, start scheduler in a separate process
             if burst:
                 self.scheduler.enqueue_scheduled_jobs()
                 self.scheduler.release_locks()
             else:
                 self.scheduler.start()
 
+    def work(
+        self,
+        burst: bool = False,
+        logging_level: str = "INFO",
+        date_format: str = DEFAULT_LOGGING_DATE_FORMAT,
+        log_format: str = DEFAULT_LOGGING_FORMAT,
+        max_jobs: Optional[int] = None,
+        with_scheduler: bool = False,
+    ) -> bool:
+        """Starts the work loop.
+
+        Pops and performs all jobs on the current list of queues.  When all
+        queues are empty, block and wait for new jobs to arrive on any of the
+        queues, unless `burst` mode is enabled.
+
+        The return value indicates whether any jobs were processed.
+
+        Args:
+            burst (bool, optional): Whether to work on burst mode. Defaults to False.
+            logging_level (str, optional): Logging level to use. Defaults to "INFO".
+            date_format (str, optional): Date Format. Defaults to DEFAULT_LOGGING_DATE_FORMAT.
+            log_format (str, optional): Log Format. Defaults to DEFAULT_LOGGING_FORMAT.
+            max_jobs (Optional[int], optional): Max number of jobs. Defaults to None.
+            with_scheduler (bool, optional): Whether to run the scheduler in a separate process. Defaults to False.
+
+        Returns:
+            worked (bool): Will return True if any job was processed, False otherwise.
+        """
+        self.bootstrap(logging_level, date_format, log_format)
+        completed_jobs = 0
+        if with_scheduler:
+            self._start_scheduler(burst, logging_level, date_format, log_format)
+
         self._install_signal_handlers()
         try:
             while True: