refactored correctness dir away from core sub dir into either functionality or core as appropriate

core/meow.py

@@ -0,0 +1,64 @@
+
+"""
+This file contains certain meow specific defintions, most notably the 
+dictionaries passed around within the runner.
+
+Author(s): David Marchant
+"""
+from datetime import datetime
+from typing import Any, Dict, Type
+
+from meow_base.core.rule import Rule
+from meow_base.functionality.validation import check_type
+from meow_base.core.vars import EVENT_TYPE, EVENT_PATH, \
+    JOB_EVENT, JOB_TYPE, JOB_ID, JOB_PATTERN, JOB_RECIPE, JOB_RULE, \
+    JOB_STATUS, JOB_CREATE_TIME, EVENT_RULE, WATCHDOG_BASE, WATCHDOG_HASH
+
+# Required keys in event dict
+EVENT_KEYS = {
+    EVENT_TYPE: str,
+    EVENT_PATH: str,
+    EVENT_RULE: Rule
+}
+
+WATCHDOG_EVENT_KEYS = {
+    WATCHDOG_BASE: str,
+    WATCHDOG_HASH: str,    
+    **EVENT_KEYS
+}
+
+# Required keys in job dict
+JOB_KEYS = {
+    JOB_TYPE: str,
+    JOB_EVENT: Dict,
+    JOB_ID: str,
+    JOB_PATTERN: Any,
+    JOB_RECIPE: Any,
+    JOB_RULE: str,
+    JOB_STATUS: str,
+    JOB_CREATE_TIME: datetime,
+}
+
+
+def valid_meow_dict(meow_dict:Dict[str,Any], msg:str, 
+        keys:Dict[str,Type])->None:
+    """Check given dictionary expresses a meow construct. This won't do much 
+    directly, but is called by more specific validation functions."""
+    check_type(meow_dict, Dict)
+    # Check we have all the required keys, and they are all of the expected 
+    # type
+    for key, value_type in keys.items():
+        if not key in meow_dict.keys():
+            raise KeyError(f"{msg} require key '{key}'")
+        check_type(meow_dict[key], value_type)
+
+def valid_event(event:Dict[str,Any])->None:
+    """Check that a given dict expresses a meow event."""
+    valid_meow_dict(event, "Event", EVENT_KEYS)
+
+def valid_job(job:Dict[str,Any])->None:
+    """Check that a given dict expresses a meow job."""
+    valid_meow_dict(job, "Job", JOB_KEYS)
+
+def valid_watchdog_event(event:Dict[str,Any])->None:
+    valid_meow_dict(event, "Watchdog event", WATCHDOG_EVENT_KEYS)