Create scheduler updates (#1174)

* Create scheduler updates

A few updates to the helper script that creates a scheduler.

* Better checking of `iers_auto` conf for downloading IERS file when problems.
* Add some typing to the file. Note that this requires python 3.10.
* Use `Path`s.

* Don't require python 3.10 syntax.

src/panoptes/pocs/scheduler/__init__.py

@@ -1,23 +1,23 @@
-import os
+from pathlib import Path
+from typing import List, Optional
 
 from astropy.utils.iers import Conf as iers_conf
+from panoptes.utils import error
+from panoptes.utils.config.client import get_config
+from panoptes.utils.library import load_module
 
-from panoptes.pocs.scheduler.constraint import Altitude
+from panoptes.pocs.scheduler.constraint import Altitude, BaseConstraint
 from panoptes.pocs.scheduler.constraint import Duration
 from panoptes.pocs.scheduler.constraint import MoonAvoidance
-
 from panoptes.pocs.scheduler.scheduler import BaseScheduler  # noqa; needed for import
-from panoptes.utils import error
-from panoptes.utils.library import load_module
-from panoptes.pocs.utils.logger import get_logger
-from panoptes.utils.config.client import get_config
-
 from panoptes.pocs.utils.location import create_location_from_config
+from panoptes.pocs.utils.logger import get_logger
 
 logger = get_logger()
 
 
-def create_scheduler_from_config(config=None, observer=None, iers_url=None, *args, **kwargs):
+def create_scheduler_from_config(config=None, observer=None, iers_url=None, *args,
+                                 **kwargs) -> Optional[BaseScheduler]:
     """ Sets up the scheduler that will be used by the observatory """
 
     scheduler_config = config or get_config('scheduler', default=None)
@@ -29,21 +29,22 @@ def create_scheduler_from_config(config=None, observer=None, iers_url=None, *arg
 
     iers_url = iers_url or scheduler_config.get('iers_url')
     if iers_url is not None:
-        logger.debug(f'Getting IERS data at {iers_url=}')
+        logger.info(f'Getting IERS data at {iers_url=}')
         iers_conf.iers_auto_url.set(iers_url)
+        iers_conf.auto_download.set(scheduler_config.get('iers_auto', False))
 
     if not observer:
         logger.debug(f'No Observer provided, creating location from config.')
         site_details = create_location_from_config()
         observer = site_details.observer
 
     # Read the targets from the file
-    fields_file = scheduler_config.get('fields_file', 'simple.yaml')
-    fields_dir = get_config('directories.fields', './conf_files/fields')
-    fields_path = os.path.join(fields_dir, fields_file)
+    fields_file = Path(scheduler_config.get('fields_file', 'simple.yaml'))
+    fields_dir = Path(get_config('directories.fields', default='./conf_files/fields'))
+    fields_path = fields_dir / fields_file
     logger.debug(f'Creating scheduler: {fields_path}')
 
-    if os.path.exists(fields_path):
+    if fields_path.exists():
         scheduler_type = scheduler_config.get('type', 'panoptes.pocs.scheduler.dispatch')
 
         try:
@@ -53,20 +54,20 @@ def create_scheduler_from_config(config=None, observer=None, iers_url=None, *arg
             constraints = create_constraints_from_config(config=scheduler_config)
 
             # Create the Scheduler instance
-            scheduler = module.Scheduler(observer,
-                                         fields_file=fields_path,
-                                         constraints=constraints,
-                                         *args, **kwargs)
+            pocs_scheduler = module.Scheduler(observer,
+                                              fields_file=str(fields_path),
+                                              constraints=constraints,
+                                              *args, **kwargs)
             logger.debug("Scheduler created")
         except error.NotFound as e:
             raise error.NotFound(msg=e)
     else:
         raise error.NotFound(msg=f"Fields file does not exist: {fields_path=!r}")
 
-    return scheduler
+    return pocs_scheduler
 
 
-def create_constraints_from_config(config=None):
+def create_constraints_from_config(config=None) -> List[BaseConstraint]:
     scheduler_config = config or get_config('scheduler', default=dict())
     constraints = list()
     for constraint_config in scheduler_config.get('constraints', list()):