policy(minor): Move policy-related code to separate package

passbook/policy/task.py

@@ -0,0 +1,38 @@
+"""passbook policy task"""
+from logging import getLogger
+from multiprocessing import Process
+from multiprocessing.connection import Connection
+from typing import Any, Dict
+
+from passbook.core.models import Policy, User
+
+LOGGER = getLogger(__name__)
+
+
+def _cache_key(policy, user):
+    return "policy_%s#%s" % (policy.uuid, user.pk)
+
+class PolicyTask(Process):
+    """Evaluate a single policy within a seprate process"""
+
+    ret: Connection
+    user: User
+    policy: Policy
+    params: Dict[str, Any]
+
+    def run(self):
+        """Task wrapper to run policy checking"""
+        for key, value in self.params.items():
+            setattr(self.user, key, value)
+        LOGGER.debug("Running policy `%s`#%s for user %s...", self.policy.name,
+                     self.policy.pk.hex, self.user)
+        policy_result = self.policy.passes(self.user)
+        # Invert result if policy.negate is set
+        if self.policy.negate:
+            policy_result = not policy_result
+        LOGGER.debug("Policy %r#%s got %s", self.policy.name, self.policy.pk.hex, policy_result)
+        # cache_key = _cache_key(self.policy, self.user)
+        # cache.set(cache_key, (self.policy.action, policy_result, message))
+        # LOGGER.debug("Cached entry as %s", cache_key)
+        self.ret.send(policy_result)
+        self.ret.close()