From 2a835e0c024eca63bf06b36a34a44a702c07c7ef Mon Sep 17 00:00:00 2001
From: "D. Berge" <dberge@aaltronav.eu>
Date: Sun, 6 Sep 2020 13:31:36 +0200
Subject: [PATCH] Limit notification payload sizes to 8 Kb

---
 etc/db/database-template.sql | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/etc/db/database-template.sql b/etc/db/database-template.sql
index f9230c2..7cec03c 100644
--- a/etc/db/database-template.sql
+++ b/etc/db/database-template.sql
@@ -153,15 +153,23 @@ CREATE FUNCTION public.notify() RETURNS trigger
     AS $$
 DECLARE
 channel text := TG_ARGV[0];
+payload text;
 BEGIN
-PERFORM pg_notify(channel, json_build_object(
+payload := json_build_object(
 'tstamp', CURRENT_TIMESTAMP,
 'operation', TG_OP,
 'schema', TG_TABLE_SCHEMA,
 'table', TG_TABLE_NAME,
 'old', row_to_json(OLD),
 'new', row_to_json(NEW)
-)::text);
+)::text;
+
+IF octet_length(payload) < 8000 THEN
+PERFORM pg_notify(channel, payload);
+ELSE
+-- We need to find another solution
+RAISE INFO 'Payload over limit';
+END IF;
 RETURN NULL;
 END;
 $$;
@@ -193,7 +201,8 @@ SET default_table_access_method = heap;
 CREATE TABLE public.projects (
     pid text NOT NULL,
     name text NOT NULL,
-    schema text NOT NULL
+    schema text NOT NULL,
+    meta jsonb DEFAULT '{}'::jsonb NOT NULL
 );