124 lines
4.5 KiB
PL/PgSQL
124 lines
4.5 KiB
PL/PgSQL
-- Enqueues a job to run Ghost tables linking process for the provided username
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CREATE OR REPLACE FUNCTION @extschema@._CDB_LinkGhostTables(username text, db_name text, event_name text)
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RETURNS void
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AS $$
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if not username:
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return
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if 'json' not in GD:
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import json
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GD['json'] = json
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else:
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json = GD['json']
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tis_config = plpy.execute("select @extschema@.CDB_Conf_GetConf('invalidation_service');")[0]['cdb_conf_getconf']
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if not tis_config:
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plpy.warning('Invalidation service configuration not found. Skipping Ghost Tables linking.')
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return
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tis_config_dict = json.loads(tis_config)
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tis_host = tis_config_dict.get('host')
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tis_port = tis_config_dict.get('port')
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tis_timeout = tis_config_dict.get('timeout', 5)
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tis_retry = tis_config_dict.get('retry', 5)
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client = GD.get('invalidation', None)
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while True:
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if not client:
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try:
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import redis
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client = redis.Redis(host=tis_host, port=tis_port, socket_timeout=tis_timeout)
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GD['invalidation'] = client
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except Exception as err:
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error = "client_error - %s" % str(err)
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# NOTE: no retries on connection error
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plpy.warning('Error trying to connect to Invalidation Service to link Ghost Tables: ' + str(err))
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break
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try:
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client.execute_command('DBSCH', db_name, username, event_name)
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break
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except Exception as err:
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error = "request_error - %s" % str(err)
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client = GD['invalidation'] = None # force reconnect
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if not tis_retry:
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plpy.warning('Error calling Invalidation Service to link Ghost Tables: ' + str(err))
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break
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tis_retry -= 1 # try reconnecting
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$$ LANGUAGE 'plpythonu' VOLATILE PARALLEL UNSAFE;
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-- Enqueues a job to run Ghost tables linking process for the current user
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CREATE OR REPLACE FUNCTION @extschema@.CDB_LinkGhostTables(event_name text DEFAULT 'USER')
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RETURNS void
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AS $$
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DECLARE
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username TEXT;
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db_name TEXT;
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BEGIN
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EXECUTE 'SELECT @extschema@.CDB_Username();' INTO username;
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EXECUTE 'SELECT current_database();' INTO db_name;
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PERFORM @extschema@._CDB_LinkGhostTables(username, db_name, event_name);
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RAISE NOTICE '_CDB_LinkGhostTables() called with username=%, event_name=%', username, event_name;
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END;
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$$ LANGUAGE plpgsql VOLATILE PARALLEL UNSAFE SECURITY DEFINER;
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-- Trigger function to call CDB_LinkGhostTables()
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CREATE OR REPLACE FUNCTION @extschema@._CDB_LinkGhostTablesTrigger()
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RETURNS trigger
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AS $$
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DECLARE
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ddl_tag TEXT;
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BEGIN
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EXECUTE 'DELETE FROM @extschema@.cdb_ddl_execution WHERE txid = txid_current() RETURNING tag;' INTO ddl_tag;
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PERFORM @extschema@.CDB_LinkGhostTables(ddl_tag);
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RETURN NULL;
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END;
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$$ LANGUAGE plpgsql VOLATILE PARALLEL UNSAFE SECURITY DEFINER;
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-- Event trigger to save the current transaction in @extschema@.cdb_ddl_execution
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CREATE OR REPLACE FUNCTION @extschema@.CDB_SaveDDLTransaction()
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RETURNS event_trigger
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AS $$
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BEGIN
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INSERT INTO @extschema@.cdb_ddl_execution VALUES (txid_current(), tg_tag) ON CONFLICT ON CONSTRAINT cdb_ddl_execution_pkey DO NOTHING;
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END;
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$$ LANGUAGE plpgsql VOLATILE PARALLEL UNSAFE SECURITY DEFINER;
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-- Creates the trigger on DDL events to link ghost tables
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CREATE OR REPLACE FUNCTION @extschema@.CDB_EnableGhostTablesTrigger()
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RETURNS void
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AS $$
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BEGIN
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DROP EVENT TRIGGER IF EXISTS link_ghost_tables;
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DROP TRIGGER IF EXISTS check_ddl_update ON @extschema@.cdb_ddl_execution;
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-- Table to store the transaction id from DDL events to avoid multiple executions
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CREATE TABLE IF NOT EXISTS @extschema@.cdb_ddl_execution(txid bigint PRIMARY KEY, tag text);
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CREATE CONSTRAINT TRIGGER check_ddl_update
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AFTER INSERT ON @extschema@.cdb_ddl_execution
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INITIALLY DEFERRED
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FOR EACH ROW
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EXECUTE PROCEDURE @extschema@._CDB_LinkGhostTablesTrigger();
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CREATE EVENT TRIGGER link_ghost_tables
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ON ddl_command_end
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WHEN TAG IN ('CREATE TABLE', 'SELECT INTO', 'DROP TABLE', 'ALTER TABLE', 'CREATE TRIGGER', 'DROP TRIGGER', 'CREATE VIEW', 'DROP VIEW', 'ALTER VIEW')
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EXECUTE PROCEDURE @extschema@.CDB_SaveDDLTransaction();
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END;
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$$ LANGUAGE plpgsql VOLATILE PARALLEL UNSAFE;
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-- Drops the trigger on DDL events to link ghost tables
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CREATE OR REPLACE FUNCTION @extschema@.CDB_DisableGhostTablesTrigger()
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RETURNS void
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AS $$
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BEGIN
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DROP EVENT TRIGGER IF EXISTS link_ghost_tables;
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DROP TRIGGER IF EXISTS check_ddl_update ON @extschema@.cdb_ddl_execution;
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DROP TABLE IF EXISTS @extschema@.cdb_ddl_execution;
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END;
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$$ LANGUAGE plpgsql VOLATILE PARALLEL UNSAFE;
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