open-vault/changelog/14033.txt

```release-note:feature
**Database plugin multiplexing**: manage multiple database connections with a single plugin process
```
feature: multiplexing support for database plugins (#14033) * feat: DB plugin multiplexing (#13734) * WIP: start from main and get a plugin runner from core * move MultiplexedClient map to plugin catalog - call sys.NewPluginClient from PluginFactory - updates to getPluginClient - thread through isMetadataMode * use go-plugin ClientProtocol interface - call sys.NewPluginClient from dbplugin.NewPluginClient * move PluginSets to dbplugin package - export dbplugin HandshakeConfig - small refactor of PluginCatalog.getPluginClient * add removeMultiplexedClient; clean up on Close() - call client.Kill from plugin catalog - set rpcClient when muxed client exists * add ID to dbplugin.DatabasePluginClient struct * only create one plugin process per plugin type * update NewPluginClient to return connection ID to sdk - wrap grpc.ClientConn so we can inject the ID into context - get ID from context on grpc server * add v6 multiplexing protocol version * WIP: backwards compat for db plugins * Ensure locking on plugin catalog access - Create public GetPluginClient method for plugin catalog - rename postgres db plugin * use the New constructor for db plugins * grpc server: use write lock for Close and rlock for CRUD * cleanup MultiplexedClients on Close * remove TODO * fix multiplexing regression with grpc server connection * cleanup grpc server instances on close * embed ClientProtocol in Multiplexer interface * use PluginClientConfig arg to make NewPluginClient plugin type agnostic * create a new plugin process for non-muxed plugins * feat: plugin multiplexing: handle plugin client cleanup (#13896) * use closure for plugin client cleanup * log and return errors; add comments * move rpcClient wrapping to core for ID injection * refactor core plugin client and sdk * remove unused ID method * refactor and only wrap clientConn on multiplexed plugins * rename structs and do not export types * Slight refactor of system view interface * Revert "Slight refactor of system view interface" This reverts commit 73d420e5cd2f0415e000c5a9284ea72a58016dd6. * Revert "Revert "Slight refactor of system view interface"" This reverts commit f75527008a1db06d04a23e04c3059674be8adb5f. * only provide pluginRunner arg to the internal newPluginClient method * embed ClientProtocol in pluginClient and name logger * Add back MLock support * remove enableMlock arg from setupPluginCatalog * rename plugin util interface to PluginClient Co-authored-by: Brian Kassouf <bkassouf@hashicorp.com> * feature: multiplexing: fix unit tests (#14007) * fix grpc_server tests and add coverage * update run_config tests * add happy path test case for grpc_server ID from context * update test helpers * feat: multiplexing: handle v5 plugin compiled with new sdk * add mux supported flag and increase test coverage * set multiplexingSupport field in plugin server * remove multiplexingSupport field in sdk * revert postgres to non-multiplexed * add comments on grpc server fields * use pointer receiver on grpc server methods * add changelog * use pointer for grpcserver instance * Use a gRPC server to determine if a plugin should be multiplexed * Apply suggestions from code review Co-authored-by: Brian Kassouf <briankassouf@users.noreply.github.com> * add lock to removePluginClient * add multiplexingSupport field to externalPlugin struct * do not send nil to grpc MultiplexingSupport * check err before logging * handle locking scenario for cleanupFunc * allow ServeConfigMultiplex to dispense v5 plugin * reposition structs, add err check and comments * add comment on locking for cleanupExternalPlugin Co-authored-by: Brian Kassouf <bkassouf@hashicorp.com> Co-authored-by: Brian Kassouf <briankassouf@users.noreply.github.com> 2022-02-17 14:50:33 +00:00			```release-note:feature
			`Database plugin multiplexing: manage multiple database connections with a single plugin process`
			```