1 files changed, 74 insertions, 0 deletions
diff --git a/opendc/models/rack_state.py b/opendc/models/rack_state.py
new file mode 100644
index 00000000..77cafd95
--- /dev/null
+++ b/opendc/models/rack_state.py
@@ -0,0 +1,74 @@
+from opendc.models.model import Model
+from opendc.util import database
+
+class RackState(Model):
+
+    JSON_TO_PYTHON_DICT = {
+        'RackState': {
+            'rackId': 'rack_id',
+            'loadFraction': 'load_fraction',
+            'tick': 'tick'
+        }
+    }
+
+    @classmethod
+    def _from_database_row(cls, row):
+        """Instantiate a RackState from a database row."""
+
+        return cls(
+            rack_id = row[0],
+            load_fraction = row[1],
+            tick = row[2]
+        )
+
+    @classmethod
+    def from_experiment_id(cls, experiment_id):
+        """Query RackStates by their Experiment id."""
+
+        rack_states = []
+
+        statement = '''
+            SELECT racks.id, avg(machine_states.load_fraction), machine_states.tick
+            FROM racks
+                JOIN machines ON racks.id = machines.rack_id
+                JOIN machine_states ON machines.id = machine_states.machine_id
+            WHERE machine_states.experiment_id = ?
+            GROUP BY machine_states.tick, racks.id
+        '''
+        results = database.fetchall(statement, (experiment_id,))
+
+        for row in results:
+            rack_states.append(cls._from_database_row(row))
+
+        return rack_states
+
+    @classmethod
+    def from_experiment_id_and_tick(cls, experiment_id, tick):
+        """Query RackStates by their Experiment id."""
+
+        rack_states = []
+
+        statement = '''
+            SELECT racks.id, avg(machine_states.load_fraction), machine_states.tick
+            FROM racks
+                JOIN machines ON racks.id = machines.rack_id
+                JOIN machine_states ON machines.id = machine_states.machine_id
+            WHERE machine_states.experiment_id = ?
+                AND machine_states.tick = ?
+            GROUP BY machine_states.tick, racks.id
+        '''
+        results = database.fetchall(statement, (experiment_id, tick))
+
+        for row in results:
+            rack_states.append(cls._from_database_row(row))
+
+        return rack_states
+    
+
+    def google_id_has_at_least(self, google_id, authorization_level):
+        """Return True if the User has at least the given auth level over this RackState."""
+
+        if authorization_level in ['EDIT', 'OWN']:
+            return False
+
+        return True