From dfa70a141a5c3a6d42578e62e5905d807bb35713 Mon Sep 17 00:00:00 2001
From: Yashar Robert <yashar@xs4all.nl>
Date: Sat, 30 Mar 2024 17:33:48 +0100
Subject: [PATCH] Allow read-only mode

---
 dcatd.yml                                          | 1 +
 src/datacatalog/application.py                     | 3 ++-
 src/datacatalog/plugins/postgres/__init__.py       | 2 +-
 src/datacatalog/plugins/postgres/config_schema.yml | 5 +++++
 4 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/dcatd.yml b/dcatd.yml
index 2d335be..8dd3e45 100644
--- a/dcatd.yml
+++ b/dcatd.yml
@@ -59,6 +59,7 @@ storage_postgres:
   pass: ${DB_PASS}
   port: ${DB_PORT}
   user: ${DB_USER}
+  mode: ${DB_MODE:-READWRITE}
 
 storage_swift:
   user: ${SWIFT_USER:-catalogus}
diff --git a/src/datacatalog/application.py b/src/datacatalog/application.py
index 6b7a9a8..5ebf655 100644
--- a/src/datacatalog/application.py
+++ b/src/datacatalog/application.py
@@ -173,7 +173,8 @@ async def _on_startup(app):
         if r.exception is not None:
             raise r.exception
     await startup_actions.run_startup_actions(app)
-    await NotificationHandler(app).setup_notification_handling()
+    if app.config['storage_postgres'].get("mode", '') != "READONLY":
+        await NotificationHandler(app).setup_notification_handling()
 
 
 async def _on_cleanup(app):
diff --git a/src/datacatalog/plugins/postgres/__init__.py b/src/datacatalog/plugins/postgres/__init__.py
index f5ce590..e8759e0 100644
--- a/src/datacatalog/plugins/postgres/__init__.py
+++ b/src/datacatalog/plugins/postgres/__init__.py
@@ -144,7 +144,7 @@ async def initialize(app):
                 raise
         else:
             break
-    while connect_attempt_tries_left >= 0:
+    while connect_attempt_tries_left >= 0 and dbconf.get('mode', 'READWRITE') != "READONLY":
         try:
             await app['pool'].execute(_Q_CREATE)
             await app['pool'].execute(_Q_CREATE_STARTUP_ACTIONS)
diff --git a/src/datacatalog/plugins/postgres/config_schema.yml b/src/datacatalog/plugins/postgres/config_schema.yml
index 72d82ab..fbfbf66 100644
--- a/src/datacatalog/plugins/postgres/config_schema.yml
+++ b/src/datacatalog/plugins/postgres/config_schema.yml
@@ -27,6 +27,11 @@ properties:
         type: integer
       max_inactive_connection_lifetime:
         type: number
+      mode:
+        type: string
+        enum:
+          - READONLY
+          - READWRITE
     required:
       - host
       - port