lws-protocols-plugins.h

/*
 * libwebsockets - small server side websockets and web server implementation
 *
 * Copyright (C) 2010 - 2019 Andy Green <andy@warmcat.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */
 
 
struct lws_protocols {
        const char *name;
        lws_callback_function *callback;
        size_t per_session_data_size;
        size_t rx_buffer_size;
        unsigned int id;
        void *user; 
        size_t tx_packet_size;
        /* Add new things just above here ---^
         * This is part of the ABI, don't needlessly break compatibility */
};
 
LWS_VISIBLE LWS_EXTERN const struct lws_protocols *
lws_vhost_name_to_protocol(struct lws_vhost *vh, const char *name);
 
LWS_VISIBLE LWS_EXTERN const struct lws_protocols *
lws_get_protocol(struct lws *wsi);
 
LWS_VISIBLE LWS_EXTERN const struct lws_protocols *
lws_protocol_get(struct lws *wsi) LWS_WARN_DEPRECATED;
 
LWS_VISIBLE LWS_EXTERN void *
lws_protocol_vh_priv_zalloc(struct lws_vhost *vhost,
                            const struct lws_protocols *prot, int size);
 
LWS_VISIBLE LWS_EXTERN void *
lws_protocol_vh_priv_get(struct lws_vhost *vhost,
                         const struct lws_protocols *prot);
 
LWS_VISIBLE LWS_EXTERN void *
lws_adjust_protocol_psds(struct lws *wsi, size_t new_size);
 
LWS_VISIBLE LWS_EXTERN int
lws_finalize_startup(struct lws_context *context);
 
LWS_VISIBLE LWS_EXTERN const struct lws_protocol_vhost_options *
lws_pvo_search(const struct lws_protocol_vhost_options *pvo, const char *name);
 
LWS_VISIBLE LWS_EXTERN int
lws_pvo_get_str(void *in, const char *name, const char **result);
 
LWS_VISIBLE LWS_EXTERN int
lws_protocol_init(struct lws_context *context);
 
#define LWS_PLUGIN_API_MAGIC 190
 
/*
 * Abstract plugin header for any kind of plugin class, always at top of
 * actual class plugin export type.
 *
 * The export type object must be exported with the same name as the plugin
 * file, eg, libmyplugin.so must export a const one of these as the symbol
 * "myplugin".
 *
 * That is the only expected export from the plugin.
 */
 
typedef struct lws_plugin_header {
        const char *name;
        const char *_class;
 
        unsigned int api_magic;
        /* set to LWS_PLUGIN_API_MAGIC at plugin build time */
 
        /* plugin-class specific superclass data follows */
} lws_plugin_header_t;
 
/*
 * "lws_protocol_plugin" class export, for lws_protocol implementations done
 * as plugins
 */
typedef struct lws_plugin_protocol {
        lws_plugin_header_t hdr;
 
        const struct lws_protocols *protocols; 
        const struct lws_extension *extensions; 
        int count_protocols; 
        int count_extensions; 
} lws_plugin_protocol_t;
 
 
/*
 * This is the dynamic, runtime created part of the plugin instantiation.
 * These are kept in a linked-list and destroyed with the context.
 */
 
struct lws_plugin {
        struct lws_plugin *list; 
        const lws_plugin_header_t *hdr;
 
        union {
#if defined(LWS_WITH_LIBUV) && defined(UV_ERRNO_MAP)
#if (UV_VERSION_MAJOR > 0)
                uv_lib_t lib; 
#endif
#endif
                void *l; 
        } u;
};
 
/*
 * Event lib library plugin type (when LWS_WITH_EVLIB_PLUGINS)
 * Public so new event libs can equally be supported outside lws itself
 */
 
typedef struct lws_plugin_evlib {
        lws_plugin_header_t hdr;
        const struct lws_event_loop_ops *ops;
} lws_plugin_evlib_t;
 
typedef int (*each_plugin_cb_t)(struct lws_plugin *p, void *user);
 
LWS_VISIBLE LWS_EXTERN int
lws_plugins_init(struct lws_plugin **pplugin, const char * const *d,
                 const char *_class, const char *filter,
                 each_plugin_cb_t each, void *each_user);
 
LWS_VISIBLE LWS_EXTERN int
lws_plugins_destroy(struct lws_plugin **pplugin, each_plugin_cb_t each,
                    void *each_user);