Refactor: DistributedJobManager with pub/sub status change notifications (#25)

* Add pubsub to render_queue and base_worker

* Refactor: Convert ZeroconfServer to Singleton with Class Methods

* New API for subjob servers to notify parent job servers of status changes

* Refactor: Move all subjob related methods to distributed_job_manager.py

* Rewrite for wait_for_subjobs

* Fix: DistributedJobManager.find_available_servers() takes 1 positional argument but 3 were given

* DistributedJobManager should now notify / be notified abotu background job changes

* Fix the make_ready api. Change children keyname to be id@hostname so it can be unique

* Fixes

* Image sequence to movie needs to find the actual start frame

* Fix: subjob_status_change did not return a valid response

* Fix client renderer selection

* Small fix for subjob status checking

* Fix issue with divide_frames_equally

* Fix issue where downloads were not occurring

* Fix issue where old status was being reported

* Add docstrings and code cleanup

lib/workers/base_worker.py

@@ -5,12 +5,11 @@ import logging
 import os
 import subprocess
 import threading
-import time
-import zipfile
 from datetime import datetime
 from enum import Enum
 
 import psutil
+from pubsub import pub
 from sqlalchemy import Column, Integer, String, DateTime, JSON
 from sqlalchemy.ext.declarative import declarative_base
 
@@ -27,8 +26,8 @@ class RenderStatus(Enum):
     CANCELLED = "cancelled"
     ERROR = "error"
     SCHEDULED = "scheduled"
-    WAITING = "waiting"
-    NOT_READY = "not_ready"
+    WAITING_FOR_SUBJOBS = "waiting_for_subjobs"
+    CONFIGURING = "configuring"
     UNDEFINED = "undefined"
 
 
@@ -101,7 +100,7 @@ class BaseRenderWorker(Base):
         self.end_time = None
 
         # History
-        self.status = RenderStatus.NOT_READY
+        self.status = RenderStatus.CONFIGURING
         self.warnings = []
         self.errors = []
 
@@ -120,8 +119,11 @@ class BaseRenderWorker(Base):
         return self._status
 
     @status.setter
-    def status(self, value):
-        self._status = value.value
+    def status(self, new_status):
+        if self._status != new_status.value:
+            old_status = self._status
+            self._status = new_status.value
+            pub.sendMessage('status_change', job_id=self.id, old_status=old_status, new_status=new_status)
 
     @status.getter
     def status(self):
@@ -230,45 +232,9 @@ class BaseRenderWorker(Base):
             logger.info(message)
             f.write(message)
 
-        from lib.server.server_proxy import RenderServerProxy
-
-        # Wait on children jobs, if necessary
         if self.children:
-            self.status = RenderStatus.WAITING
-            subjobs_still_running = self.children.copy()
-            while len(subjobs_still_running):
-                for hostname, job_id in subjobs_still_running.copy().items():
-                    proxy = RenderServerProxy(hostname)
-                    response = proxy.get_job_info(job_id)
-                    if not response:
-                        logger.warning(f"No response from: {hostname}")
-                    else:
-                        status = string_to_status(response.get('status', ''))
-                        status_msg = f"Subjob {job_id}@{hostname} | Status: {status} | {response.get('percent_complete')}%"
-
-                        if status in [RenderStatus.CANCELLED, RenderStatus.ERROR, RenderStatus.COMPLETED]:
-                            logger.info(f"Downloading completed subjob files from {hostname} to localhost")
-                            try:
-                                zip_file_path = self.output_path + f'_{hostname}_{job_id}.zip'
-                                proxy.get_job_files(job_id, zip_file_path)
-                                logger.debug("Zip file download successfully - Preparing to unzip.")
-                                extract_path = os.path.dirname(zip_file_path)
-                                with zipfile.ZipFile(zip_file_path, 'r') as zip_ref:
-                                    zip_ref.extractall(extract_path)
-                                    logger.info(f"Successfully extracted zip to: {extract_path}")
-                                os.remove(zip_file_path)
-                            except Exception as e:
-                                err_msg = f"Error transferring output from subjob {job_id}@{hostname}: {e}"
-                                logger.exception(err_msg)
-                                self.errors.append(err_msg)
-                            finally:
-                                subjobs_still_running.pop(hostname)
-                        else:
-                            logger.debug(status_msg)
-                logger.debug(f"Waiting on {len(subjobs_still_running)} subjobs on {', '.join(list(subjobs_still_running.keys()))}")
-                time.sleep(5)
-
-            logger.info("All subjobs complete")
+            from lib.distributed_job_manager import DistributedJobManager
+            DistributedJobManager.wait_for_subjobs(local_job=self)
 
         # Post Render Work
         logger.debug("Starting post-processing work")