Worker.find_by_key should use hmget instead of repeated hget calls. (#826)

rq/worker.py

@@ -129,9 +129,10 @@ class Worker(object):
                      connection=connection,
                      job_class=job_class,
                      queue_class=queue_class)
-        queues = as_text(connection.hget(worker.key, 'queues'))
-        worker._state = as_text(connection.hget(worker.key, 'state') or '?')
-        worker._job_id = connection.hget(worker.key, 'current_job') or None
+        queues, state, job_id = connection.hmget(worker.key, 'queues', 'state', 'current_job')
+        queues = as_text(queues)
+        worker._state = as_text(state or '?')
+        worker._job_id = job_id or None
         if queues:
             worker.queues = [worker.queue_class(queue,
                                                 connection=connection,
@@ -139,9 +140,8 @@ class Worker(object):
                              for queue in queues.split(',')]
         return worker
 
-    def __init__(self, queues, name=None,
-                 default_result_ttl=None, connection=None, exc_handler=None,
-                 exception_handlers=None, default_worker_ttl=None,
+    def __init__(self, queues, name=None, default_result_ttl=None, connection=None,
+                 exc_handler=None, exception_handlers=None, default_worker_ttl=None,
                  job_class=None, queue_class=None):  # noqa
         if connection is None:
             connection = get_current_connection()

tests/test_worker.py

@@ -13,7 +13,6 @@ import subprocess
 import sys
 
 import pytest
-
 import mock
 from mock import Mock
 
@@ -31,7 +30,7 @@ from rq.job import Job, JobStatus
 from rq.registry import StartedJobRegistry
 from rq.suspension import resume, suspend
 from rq.utils import utcnow
-from rq.worker import HerokuWorker
+from rq.worker import HerokuWorker, WorkerStatus
 
 
 class CustomJob(Job):
@@ -43,6 +42,7 @@ class CustomQueue(Queue):
 
 
 class TestWorker(RQTestCase):
+
     def test_create_worker(self):
         """Worker creation using various inputs."""
 
@@ -105,10 +105,23 @@ class TestWorker(RQTestCase):
             'Expected at least some work done.'
         )
 
+    def test_find_by_key(self):
+        """Worker.find_by_key restores queues, state and job_id."""
+        queues = [Queue('foo'), Queue('bar')]
+        w = Worker(queues)
+        w.register_death()
+        w.register_birth()
+        w.set_state(WorkerStatus.STARTED)
+        worker = Worker.find_by_key(w.key)
+        self.assertEqual(worker.queues, queues)
+        self.assertEqual(worker.get_state(), WorkerStatus.STARTED)
+        self.assertEqual(worker._job_id, None)
+        w.register_death()
+
     def test_worker_ttl(self):
         """Worker ttl."""
         w = Worker([])
-        w.register_birth()  # ugly: our test should only call public APIs
+        w.register_birth()
         [worker_key] = self.testconn.smembers(Worker.redis_workers_keys)
         self.assertIsNotNone(self.testconn.ttl(worker_key))
         w.register_death()