Move storage classes into a main "data store".

This is in preparation for having multiple data stores that offer
different functionality, e.g. splitting out state or event storage.

synapse/storage/data_stores/main/openid.py

@@ -0,0 +1,31 @@
+from synapse.storage._base import SQLBaseStore
+
+
+class OpenIdStore(SQLBaseStore):
+    def insert_open_id_token(self, token, ts_valid_until_ms, user_id):
+        return self._simple_insert(
+            table="open_id_tokens",
+            values={
+                "token": token,
+                "ts_valid_until_ms": ts_valid_until_ms,
+                "user_id": user_id,
+            },
+            desc="insert_open_id_token",
+        )
+
+    def get_user_id_for_open_id_token(self, token, ts_now_ms):
+        def get_user_id_for_token_txn(txn):
+            sql = (
+                "SELECT user_id FROM open_id_tokens"
+                " WHERE token = ? AND ? <= ts_valid_until_ms"
+            )
+
+            txn.execute(sql, (token, ts_now_ms))
+
+            rows = txn.fetchall()
+            if not rows:
+                return None
+            else:
+                return rows[0][0]
+
+        return self.runInteraction("get_user_id_for_token", get_user_id_for_token_txn)