[#396,!205] Added audit for global parameters.

src/share/database/scripts/mysql/dhcpdb_create.mysql

@@ -1,4 +1,4 @@
-# Copyright (C) 2012-2018 Internet Systems Consortium, Inc. ("ISC")
+# Copyright (C) 2012-2019 Internet Systems Consortium, Inc. ("ISC")
 #
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
@@ -1334,6 +1334,118 @@ SET version = '7', minor = '0';
 
 # This line concludes database upgrade to version 7.0.
 
+-- -----------------------------------------------------
+-- Table `dhcp4_audit_revision`
+-- -----------------------------------------------------
+CREATE TABLE IF NOT EXISTS dhcp4_audit_revision (
+    id BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT,
+    modification_ts TIMESTAMP NOT NULL,
+    log_message TEXT,
+    PRIMARY KEY (id),
+    KEY key_dhcp4_audit_revision_by_modification_ts (modification_ts)
+) ENGINE=InnoDB;
+
+-- -----------------------------------------------------
+-- Drop columns from the dhcp4_audit table which now
+-- belong to the dhcp4_audit_revision.
+-- -----------------------------------------------------
+ALTER TABLE dhcp4_audit
+    DROP COLUMN modification_ts,
+    DROP COLUMN log_message;
+
+-- -----------------------------------------------------
+-- Add column revision_id and the foreign key with a
+-- refrence to the dhcp4_audit_revision table.
+-- -----------------------------------------------------
+ALTER TABLE dhcp4_audit
+    ADD COLUMN revision_id BIGINT(20) UNSIGNED NOT NULL;
+
+ALTER TABLE dhcp4_audit
+    ADD CONSTRAINT fk_dhcp4_audit_revision FOREIGN KEY (revision_id)
+        REFERENCES dhcp4_audit_revision (id)
+        ON DELETE NO ACTION ON UPDATE CASCADE;
+
+-- -----------------------------------------------------
+-- Stored procedure which creates a new entry in the
+-- dhcp4_audit_revision table. This procedure should
+-- be called from the triggers of the tables where
+-- the config modifications are applied. If the
+-- corresponding revision doesn't exist, it will be
+-- created by this procedure.
+-- -----------------------------------------------------
+DROP PROCEDURE IF EXISTS createAuditRevisionDHCP4;
+DELIMITER $$
+CREATE PROCEDURE createAuditRevisionDHCP4()
+BEGIN
+    IF @audit_revision_id IS NULL THEN
+       INSERT INTO dhcp4_audit_revision (modification_ts, log_message)
+           VALUES (NOW(), @audit_log_message);
+       SET @audit_revision_id = LAST_INSERT_ID();
+    END IF;
+END $$
+DELIMITER ;
+
+-- -----------------------------------------------------
+-- Stored procedure which creates a new entry in the
+-- dhcp4_audit table. It should be called from the
+-- triggers of the tables where the config modifications
+-- are applied. The @audit_revision_id variable contains
+-- the revision id to be placed in the audit entries.
+-- ----------------------------------------------------
+DROP PROCEDURE IF EXISTS createAuditEntryDHCP4;
+DELIMITER $$
+CREATE PROCEDURE createAuditEntryDHCP4(IN object_type_val VARCHAR(256),
+                                       IN object_id_val BIGINT(20) UNSIGNED,
+                                       IN modification_type_val TINYINT(1))
+BEGIN
+    INSERT INTO dhcp4_audit (object_type, object_id, modification_type, revision_id)
+        VALUES (object_type_val, object_id_val, modification_type_val, @audit_revision_id);
+END $$
+DELIMITER ;
+
+-- -----------------------------------------------------
+-- Triggers used to create entries in the audit
+-- tables upon insertion, update or deletion of the
+-- configuration entries.
+-- -----------------------------------------------------
+
+# Create dhcp4_global_parameter insert trigger
+DELIMITER $$
+CREATE TRIGGER dhcp4_global_parameter_AINS AFTER INSERT ON dhcp4_global_parameter
+    FOR EACH ROW
+    BEGIN
+        CALL createAuditRevisionDHCP4();
+        CALL createAuditEntryDHCP4('dhcp4_global_parameter', NEW.id, 0);
+    END $$
+DELIMITER ;
+
+# Create dhcp4_global_parameter update trigger
+DELIMITER $$
+CREATE TRIGGER dhcp4_global_parameter_AUPD AFTER UPDATE ON dhcp4_global_parameter
+    FOR EACH ROW
+    BEGIN
+        CALL createAuditRevisionDHCP4();
+        CALL createAuditEntryDHCP4('dhcp4_global_parameter', NEW.id, 1);
+    END $$
+DELIMITER ;
+
+# Create dhcp4_global_parameter delete trigger
+DELIMITER $$
+CREATE TRIGGER dhcp4_global_parameter_ADEL AFTER DELETE ON dhcp4_global_parameter
+    FOR EACH ROW
+    BEGIN
+        CALL createAuditRevisionDHCP4();
+        CALL createAuditEntryDHCP4('dhcp4_global_parameter', OLD.id, 2);
+    END $$
+DELIMITER ;
+
+# Update the schema version number
+UPDATE schema_version
+SET version = '8', minor = '0';
+
+# This line concludes database upgrade to version 8.0.
+
+
 # Notes:
 #
 # Indexes