add replication to postgres

streams-events/app/events/replicate_into_postgres.py

@@ -34,6 +34,8 @@ class JSONEncoder(Encoder):
 
 logger = Logger(__name__)
 tracer = Tracer()
+CONNINFO = f'dbname={POSTGRES_DB} user={POSTGRES_USER} password={POSTGRES_PASSWORD} \
+            host={POSTGRES_HOST} port={POSTGRES_PORT}'
 
 
 UPSERT_QUERY = sql.SQL("""
@@ -50,13 +52,7 @@ DELETE FROM {0} WHERE _id = ANY(%s);
 @logger.inject_lambda_context
 @tracer.capture_lambda_handler
 def lambda_handler(event: DynamoDBStreamEvent, context: LambdaContext):
-    with psycopg.connect(
-        dbname=POSTGRES_DB,
-        user=POSTGRES_USER,
-        password=POSTGRES_PASSWORD,
-        host=POSTGRES_HOST,
-        port=POSTGRES_PORT,
-    ) as conn:
+    with psycopg.connect(CONNINFO) as conn:
         with conn.cursor() as cur:
             upsert_batches = {}
             delete_batches = {}
@@ -84,11 +80,11 @@ def lambda_handler(event: DynamoDBStreamEvent, context: LambdaContext):
                         delete_batches[table_name].append(_id)
 
             for table_name, rows in upsert_batches.items():
-                query = UPSERT_QUERY.format(sql.Identifier(table_name)).as_string(conn)
+                query = UPSERT_QUERY.format(sql.Identifier(table_name))
                 cur.executemany(query, rows)
 
             for table_name, ids in delete_batches.items():
-                query = DELETE_QUERY.format(sql.Identifier(table_name)).as_string(conn)
+                query = DELETE_QUERY.format(sql.Identifier(table_name))
                 cur.execute(query, [ids])
 
             conn.commit()