Docs InternalPlugins » History » Revision 8
Revision 7 (Anonymous, 2008-01-05 10:52) → Revision 8/10 (Anonymous, 2008-01-05 10:52)
[[TracNav(DocsToc)]] <pre> {{{ #!rst ================ Plugin Interface ================ ------------ Module: core ------------ .. meta:: :keywords: lighttpd, plugins .. contents:: Table of Contents Description =========== Plugins allow you to enhance the functionality of lighttpd without changing the core of the webserver. They can be loaded at startup time and can change virtually any aspect of the behaviour of the webserver. Plugin Entry Points ------------------- lighttpd has 16 hooks which are used in different states of the execution of the request: Serverwide hooks ```````````````` :init_: called when the plugin is loaded :cleanup_: called when the plugin is unloaded :set_defaults_: called when the configuration has to be processed :handle_trigger_: called once a second :handle_sighup_: called when the server received a SIGHUP Connectionwide hooks ```````````````````` Most of these hooks are called in ``http_response_prepare()`` after some fields in the connection structure are set. handle_uri_raw_: called after uri.path_raw, uri.authority and uri.scheme are set handle_uri_clean_: called after uri.path (a clean URI without .. and %20) is set handle_docroot_: called at the end of the logical path handle to get a docroot handle_subrequest_start_: called if the physical path is set up and checked handle_subrequest_: called at the end of ``http_response_prepare()`` handle_physical_path_: called after the physical path is created and no other handler is found for this request handle_request_done_: called when the request is done handle_connection_close_: called if the connection has to be closed handle_joblist_: called after the connection_state_engine is left again and plugin internal handles have to be called connection_reset_: called if the connection structure has to be cleaned up Plugin Interface ---------------- \*_plugin_init `````````````` Every plugin has a uniquely-named function which is called after the plugin is loaded. It is used to set up the ``plugin`` structure with some useful data: - name of the plugin ``name`` - all hooks The field ``data`` and ``lib`` should not be touched in the init function. ``lib`` is the library handler from dlopen and ``data`` will be the storage of the internal plugin data. :returns: 0 (not handled) init ```` The first real call of a plugin function is the init hook which is used to set up the internal plugin data. The internal plugin is assigned the ``data`` field mentioned in the \*_plugin_init description. :returns: a pointer to the internal plugin data. cleanup ``````` The cleanup hook is called just before the plugin is unloaded. It is meant to free all buffers allocated in ``init`` or somewhere else in the plugin which are still not freed and to close all handles which were opened and are not closed yet. :returns: HANDLER_GO_ON if ok (not handled) set_defaults ```````````` set_defaults is your entry point into the configfile parsing. It should pass a list of options to ``config_insert_values`` and check if the plugin configuration is valid. If it is not valid yet, it should set useful defaults or return with HANDLER_ERROR and an error message. :returns: HANDLER_GO_ON if ok HANDLER_ERROR will terminate lighttpd connection_reset ```````````````` called at the end of each request :returns: HANDLER_GO_ON if ok HANDLER_ERROR on error handle_trigger `````````````` called once a second :returns: HANDLER_GO_ON if ok HANDLER_ERROR on error handle_sighup ````````````` called if a SIGHUP is received (cycling logfiles, ...) :returns: HANDLER_GO_ON if ok HANDLER_ERROR on error handle_uri_raw `````````````` called after uri_raw is set :returns: HANDLER_GO_ON if ok HANDLER_FINISHED if the final output is prepared HANDLER_ERROR on error handle_uri_clean ```````````````` called after uri.path is set :returns: HANDLER_GO_ON if ok HANDLER_FINISHED if the final output is prepared HANDLER_ERROR on error handle_docroot `````````````` called when a docroot is needed :returns: HANDLER_GO_ON if ok HANDLER_FINISHED if the final output is prepared HANDLER_ERROR on error handle_subrequest_start ``````````````````````` called after physical.path is set :returns: HANDLER_GO_ON if ok HANDLER_FINISHED if the final output is prepared HANDLER_ERROR on error handle_subrequest ````````````````` called if subrequest_start requested a COMEBACK or a WAIT_FOR_EVENT :returns: HANDLER_GO_ON if ok HANDLER_FINISHED if the final output is prepared HANDLER_ERROR on error handle_physical_path ```````````````````` called after physical.path is set :returns: HANDLER_GO_ON if ok HANDLER_FINISHED if the final output is prepared HANDLER_ERROR on error handle_request_done ``````````````````` called at the end of the request (logging, statistics, ...) :returns: HANDLER_GO_ON if ok HANDLER_ERROR on error handle_connection_close ``````````````````````` called if the connection is terminated :returns: HANDLER_GO_ON if ok HANDLER_ERROR on error handle_joblist `````````````` called if the state of the connection has changed :returns: HANDLER_GO_ON if ok HANDLER_ERROR on error </pre> }}}