Note: I may be able to work on putting together a pull request for this feature request, but I wanted to make sure you were okay with this feature request and the approach I'm taking before doing all that work, hence I am filing this feature request for discussion and approval.
MySQL has a feature enabling server tracking of client session state changes. When this is enabled on the server and client, the server can actually notify the connected client about changes to its session state. This enables the client to, for example (our use case), determine which Global Transaction ID (GTID) or GTIDs were created when the client commits a transaction.
You can read more about this here:
Here's what is needed to support this:
- A new constant in
MySQLdb.constants.CLIENT: SESSION_TRACK = 1 << 23
- A new method on
_mysql.connection named get_session_track_gtids which returns a list of GTIDs using C functions mysql_session_track_get_first/mysql_session_track_get_next and the enum value SESSION_TRACK_GTIDS.
- A new method on
_mysql.connection named get_session_track_variables which returns a list of namedtuples containing the session variable names and values for changed variables using the same C functions and the enum value SESSION_TRACK_SYSTEM_VARIABLES.
- A new method on
_mysql.connection named get_session_track_tx_characteristics which returns a list of strings of the characteristics that changed using the same C functions and the enum value SESSION_TRACK_TRANSACTION_CHARACTERISTICS.
- A new method on
_mysql.connection named get_session_track_tx_state which returns a list of namedtuples containing information parsed from the data as described in the documentation for SESSION_TRACK_TRANSACTION_STATE using the same C functions and the enum value SESSION_TRACK_TRANSACTION_STATE.
The bare minimum that we need is items 1 and 2, but implementing also 3 through 5 would be more complete.
Note: I may be able to work on putting together a pull request for this feature request, but I wanted to make sure you were okay with this feature request and the approach I'm taking before doing all that work, hence I am filing this feature request for discussion and approval.
MySQL has a feature enabling server tracking of client session state changes. When this is enabled on the server and client, the server can actually notify the connected client about changes to its session state. This enables the client to, for example (our use case), determine which Global Transaction ID (GTID) or GTIDs were created when the client commits a transaction.
You can read more about this here:
Here's what is needed to support this:
MySQLdb.constants.CLIENT:SESSION_TRACK = 1 << 23_mysql.connectionnamedget_session_track_gtidswhich returns a list of GTIDs using C functionsmysql_session_track_get_first/mysql_session_track_get_nextand the enum valueSESSION_TRACK_GTIDS._mysql.connectionnamedget_session_track_variableswhich returns a list of namedtuples containing the session variable names and values for changed variables using the same C functions and the enum valueSESSION_TRACK_SYSTEM_VARIABLES._mysql.connectionnamedget_session_track_tx_characteristicswhich returns a list of strings of the characteristics that changed using the same C functions and the enum valueSESSION_TRACK_TRANSACTION_CHARACTERISTICS._mysql.connectionnamedget_session_track_tx_statewhich returns a list of namedtuples containing information parsed from the data as described in the documentation forSESSION_TRACK_TRANSACTION_STATEusing the same C functions and the enum valueSESSION_TRACK_TRANSACTION_STATE.The bare minimum that we need is items 1 and 2, but implementing also 3 through 5 would be more complete.