6.4.6 The Audit Message Component

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As of MySQL 8.0.14, the audit_api_message_emit component enables applications to add their own message events to the audit log, using the audit_api_message_emit_udf() user-defined function.

The audit_api_message_emit component cooperates with all plugins of audit type. For concreteness, examples use the audit_log plugin described in Section 6.4.5, “MySQL Enterprise Audit”.

Installing or Uninstalling the Audit Message Component

To be usable by the server, the component library file must be located in the MySQL plugin directory (the directory named by the plugin_dir system variable). If necessary, configure the plugin directory location by setting the value of plugin_dir at server startup.

To install the audit_api_message_emit component, use this statement:

INSTALL COMPONENT "file://component_audit_api_message_emit";

Component installation is a one-time operation that need not be done per server startup. INSTALL COMPONENT loads the component, and also registers it in the mysql.component system table to cause it to be loaded during subsequent server startups.

To uninstall the audit_api_message_emit component, use this statement:

UNINSTALL COMPONENT "file://component_audit_api_message_emit";

UNINSTALL COMPONENT unloads the component, and deregisters it from the mysql.component system table to cause it not to be loaded during subsequent server startups.

Installing or uninstalling the audit_api_message_emit component installs or uninstalls the audit_api_message_emit_udf() function that the component implements. It is not necessary to use CREATE FUNCTION or DROP FUNCTION to do so.

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Audit Message Function

This section describes the audit_api_message_emit_udf() user-defined function (UDF) implemented by the audit_api_message_emit component.

Before using the audit message function, install the audit message component according to the instructions provided at Installing or Uninstalling the Audit Message Component.

audit_api_message_emit_udf(component, producer, message[, key, value] ...)
Adds a message event to the audit log. Message events include component, producer, and message strings of the caller's choosing, and optionally a set of key-value pairs.
An event posted by this UDF is sent to all enabled plugins of audit type, each of which handles the event according to its own rules. If no plugin of audit type is enabled, posting the event has no effect.
Arguments:
- component: A string that specifies a component name.
- producer: A string that specifies a producer name.
- message: A string that specifies the event message.
- key, value: Events may include 0 or more key-value pairs that specify an arbitrary application-provided data map. Each key argument is a string that specifies a name for its immediately following value argument. Each value argument specifies a value for its immediately following key argument. Each value can be a string or numeric value, or NULL.
Return value:
The string OK to indicate success. An error occurs if the function fails.
Example:
1. mysql> SELECT audit_api_message_emit_udf('component_text',
2. 'producer_text',
3. 'message_text',
4. 'key1', 'value1',
5. 'key2', 123,
6. 'key3', NULL) AS 'Message';
7. +---------+
8. | Message |
9. +---------+
10. | OK |
11. +---------+
Additional information:
Each audit plugin that receives an event posted by audit_api_message_emit_udf() logs the event in plugin-specific format. For example, the audit_log plugin (see Section 6.4.5, “MySQL Enterprise Audit”) logs message values as follows, depending on the log format configured by the audit_log_format system variable:
- JSON format (audit_log_format=JSON):
```
{
  ...
  "class": "message",
  "event": "user",
  ...
  "message_data": {
    "component": "component_text",
    "producer": "producer_text",
    "message": "message_text",
    "map": {
      "key1": "value1",
      "key2": 123,
      "key3": null
    }
  }
}
```
- New-style XML format (audit_log_format=NEW):
```
<AUDIT_RECORD>
 ...
 <NAME>Message</NAME>
 ...
 <COMMAND_CLASS>user</COMMAND_CLASS>
 <COMPONENT>component_text</COMPONENT>
 <PRODUCER>producer_text</PRODUCER>
 <MESSAGE>message_text</MESSAGE>
 <MAP>
   <ELEMENT>
     <KEY>key1</KEY>
     <VALUE>value1</VALUE>
   </ELEMENT>
   <ELEMENT>
     <KEY>key2</KEY>
     <VALUE>123</VALUE>
   </ELEMENT>
   <ELEMENT>
     <KEY>key3</KEY>
     <VALUE/>
   </ELEMENT>
 </MAP>
</AUDIT_RECORD>
```
- Old-style XML format (audit_log_format=OLD):
```
<AUDIT_RECORD
  ...
  NAME="Message"
  ...
  COMMAND_CLASS="user"
  COMPONENT="component_text"
  PRODUCER="producer_text"
  MESSAGE="message_text"/>
```
  Note
  
  Message events logged in old-style XML format do not include the key-value map due to representational constraints imposed by this format.
Messages posted by audit_api_message_emit_udf() have an event class of MYSQL_AUDIT_MESSAGE_CLASS and a subclass of MYSQL_AUDIT_MESSAGE_USER. (Interally generated audit messages have the same class and a subclass of MYSQL_AUDIT_MESSAGE_INTERNAL; this subclass currently is unused.) To refer to such events in audit_log filtering rules, use a class element with a name value of message. For example:
```
{
  "filter": {
    "class": {
      "name": "message"
    }
  }
}
```
Should it be necessary to distinguish user-generated and internally generated message events, test the subclass value against user or internal.
Filtering based on the contents of the key-value map is not supported.
For information about writing filtering rules, see Section 6.4.5.6, “Audit Log Filtering”.

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