automation: establish an automation framework

app/terraform/bridge/__init__.py

@@ -1,14 +1,14 @@
 import datetime
-from typing import Iterable
+from typing import Iterable, Optional, Any
 
 from app import app
 from app.extensions import db
 from app.models.bridges import BridgeConf, Bridge
 from app.models.base import Group
-from app.terraform import BaseAutomation
+from app.terraform.terraform import TerraformAutomation
 
 
-class BridgeAutomation(BaseAutomation):
+class BridgeAutomation(TerraformAutomation):
     def create_missing(self):
         bridgeconfs: Iterable[BridgeConf] = BridgeConf.query.filter(
             BridgeConf.provider == self.provider,
@@ -45,8 +45,12 @@ class BridgeAutomation(BaseAutomation):
             bridge.destroy()
         db.session.commit()
 
-    def generate_terraform(self):
-        self.write_terraform_config(
+    def tf_prehook(self) -> Optional[Any]:
+        self.create_missing()
+        self.destroy_expired()
+
+    def tf_generate(self):
+        self.tf_write(
             self.template,
             groups=Group.query.all(),
             bridgeconfs=BridgeConf.query.filter(
@@ -60,8 +64,8 @@ class BridgeAutomation(BaseAutomation):
             }
         )
 
-    def import_terraform(self):
-        outputs = self.terraform_output()
+    def tf_posthook(self, *, prehook_result: Any = None) -> None:
+        outputs = self.tf_output()
         for output in outputs:
             if output.startswith('bridge_hashed_fingerprint_'):
                 parts = outputs[output]['value'].split(" ")