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diff --git a/docs/4_APIs_and_Services/4.3_Application_Framework_Binder/3_Binder_references/4_Functions_of_class_afb_req.md b/docs/4_APIs_and_Services/4.3_Application_Framework_Binder/3_Binder_references/4_Functions_of_class_afb_req.md deleted file mode 100644 index 773bae0..0000000 --- a/docs/4_APIs_and_Services/4.3_Application_Framework_Binder/3_Binder_references/4_Functions_of_class_afb_req.md +++ /dev/null @@ -1,851 +0,0 @@ ---- -edit_link: '' -title: Functions of class afb_req -origin_url: >- - https://git.automotivelinux.org/src/app-framework-binder/plain/docs/reference-v3/func-req.md?h=master ---- - -<!-- WARNING: This file is generated by fetch_docs.js using /home/boron/Documents/AGL/docs-webtemplate/site/_data/tocs/apis_services/master/app-framework-binder-developer-guides-api-services-book.yml --> - -Functions of class **afb_req** -============================ - -## General function - -### afb_req_is_valid - -```C -/** - * Checks whether the request 'req' is valid or not. - * - * @param req the request to check - * - * @return 0 if not valid or 1 if valid. - */ -int afb_req_is_valid( - afb_req_t req); -``` - -### afb_req_get_api - -```C -/** - * Retrieves the api that serves the request - * - * @param req the request whose serving api is queried - * - * @return the api serving the request - */ -afb_api_t afb_req_get_api( - afb_req_t req); -``` - -### afb_req_get_vcbdata - -```C -/** - * Retrieves the callback data of the verb. This callback data is set - * when the verb is created. - * - * @param req whose verb vcbdata is queried - * - * @return the callback data attached to the verb description - */ -void *afb_req_get_vcbdata( - afb_req_t req); -``` - -### afb_req_get_called_api - -```C -/** - * Retrieve the name of the called api. - * - * @param req the request - * - * @return the name of the called api - * - * @see afb_api_new_api - * @see afb_api_add_alias - */ -const char *afb_req_get_called_api( - afb_req_t req); -``` - -### afb_req_get_called_verb - -```C -/** - * Retrieve the name of the called verb - * - * @param req the request - * - * @return the name of the called verb - */ -const char *afb_req_get_called_verb( - afb_req_t req); -``` - -### afb_req_addref - -```C -/** - * Increments the count of references of 'req'. - * - * @param req the request - * - * @return returns the request req - */ -afb_req_t *afb_req_addref( - afb_req_t req); -``` - -### afb_req_unref - -```C -/** - * Decrement the count of references of 'req'. - * - * @param req the request - */ -void afb_req_unref( - afb_req_t req); -``` - - -## Logging functions - -### afb_req_wants_log_level - -```C -/** - * Is the log message of 'level (as defined for syslog) required for the - * request 'req'? - * - * @param req the request - * @param level the level to check as defined for syslog: - * - * EMERGENCY 0 System is unusable - * ALERT 1 Action must be taken immediately - * CRITICAL 2 Critical conditions - * ERROR 3 Error conditions - * WARNING 4 Warning conditions - * NOTICE 5 Normal but significant condition - * INFO 6 Informational - * DEBUG 7 Debug-level messages - * - * @return 0 if not required or a value not null if required - * - * @see syslog - */ -int afb_req_wants_log_level( - afb_req_t req, - int level); -``` - -### afb_req_vverbose - -```C -/** - * Send associated to 'req' a message described by 'fmt' and its 'args' - * to the journal for the verbosity 'level'. - * - * 'file', 'line' and 'func' are indicators of position of the code in source files - * (see macros __FILE__, __LINE__ and __func__). - * - * 'level' is defined by syslog standard: - * EMERGENCY 0 System is unusable - * ALERT 1 Action must be taken immediately - * CRITICAL 2 Critical conditions - * ERROR 3 Error conditions - * WARNING 4 Warning conditions - * NOTICE 5 Normal but significant condition - * INFO 6 Informational - * DEBUG 7 Debug-level messages - * - * @param req the request - * @param level the level of the message - * @param file the source filename that emits the message or NULL - * @param line the line number in the source filename that emits the message - * @param func the name of the function that emits the message or NULL - * @param fmt the message format as for printf - * @param args the arguments to the format - * - * @see printf - * @see afb_req_verbose - */ -void afb_req_vverbose( - afb_req_t req, - int level, const char *file, - int line, - const char * func, - const char *fmt, - va_list args); -``` - -### afb_req_verbose - -```C -/** - * Send associated to 'req' a message described by 'fmt' and following parameters - * to the journal for the verbosity 'level'. - * - * 'file', 'line' and 'func' are indicators of position of the code in source files - * (see macros __FILE__, __LINE__ and __func__). - * - * 'level' is defined by syslog standard: - * EMERGENCY 0 System is unusable - * ALERT 1 Action must be taken immediately - * CRITICAL 2 Critical conditions - * ERROR 3 Error conditions - * WARNING 4 Warning conditions - * NOTICE 5 Normal but significant condition - * INFO 6 Informational - * DEBUG 7 Debug-level messages - * - * @param req the request - * @param level the level of the message - * @param file the source filename that emits the message or NULL - * @param line the line number in the source filename that emits the message - * @param func the name of the function that emits the message or NULL - * @param fmt the message format as for printf - * @param ... the arguments of the format 'fmt' - * - * @see printf - */ -void afb_req_verbose( - afb_req_t req, - int level, const char *file, - int line, - const char * func, - const char *fmt, - ...); -``` - -## Arguments/parameters function - -### afb_req_get - -```C -/** - * Gets from the request 'req' the argument of 'name'. - * - * Returns a PLAIN structure of type 'struct afb_arg'. - * - * When the argument of 'name' is not found, all fields of result are set to NULL. - * - * When the argument of 'name' is found, the fields are filled, - * in particular, the field 'result.name' is set to 'name'. - * - * There is a special name value: the empty string. - * The argument of name "" is defined only if the request was made using - * an HTTP POST of Content-Type "application/json". In that case, the - * argument of name "" receives the value of the body of the HTTP request. - * - * @param req the request - * @param name the name of the argument to get - * - * @return a structure describing the retrieved argument for the request - * - * @see afb_req_value - * @see afb_req_path - */ -struct afb_arg afb_req_get( - afb_req_t req, - const char *name); -``` - -### afb_req_value - -```C -/** - * Gets from the request 'req' the string value of the argument of 'name'. - * Returns NULL if when there is no argument of 'name'. - * Returns the value of the argument of 'name' otherwise. - * - * Shortcut for: afb_req_get(req, name).value - * - * @param req the request - * @param name the name of the argument's value to get - * - * @return the value as a string or NULL - * - * @see afb_req_get - * @see afb_req_path - */ -const char *afb_req_value( - afb_req_t req, - const char *name); -``` - -### afb_req_path - -```C -/** - * Gets from the request 'req' the path for file attached to the argument of 'name'. - * Returns NULL if when there is no argument of 'name' or when there is no file. - * Returns the path of the argument of 'name' otherwise. - * - * Shortcut for: afb_req_get(req, name).path - * - * @param req the request - * @param name the name of the argument's path to get - * - * @return the path if any or NULL - * - * @see afb_req_get - * @see afb_req_value - */ -const char *afb_req_path( - afb_req_t req, - const char *name); -``` - -### afb_req_json - -```C -/** - * Gets from the request 'req' the json object hashing the arguments. - * - * The returned object must not be released using 'json_object_put'. - * - * @param req the request - * - * @return the JSON object of the query - * - * @see afb_req_get - * @see afb_req_value - * @see afb_req_path - */ -struct json_object *afb_req_json( - afb_req_t req); -``` - -## Reply functions - -The functions **success** and **fail** are still supported. -These functions are now implemented as the following macros: - -```C -#define afb_req_success(r,o,i) afb_req_reply(r,o,NULL,i) -#define afb_req_success_f(r,o,...) afb_req_reply_f(r,o,NULL,__VA_ARGS__) -#define afb_req_success_v(r,o,f,v) afb_req_reply_v(r,o,NULL,f,v) -#define afb_req_fail(r,e,i) afb_req_reply(r,NULL,e,i) -#define afb_req_fail_f(r,e,...) afb_req_reply_f(r,NULL,e,__VA_ARGS__) -#define afb_req_fail_v(r,e,f,v) afb_req_reply_v(r,NULL,e,f,v) -``` - - -### afb_req_reply - -```C -/** - * Sends a reply to the request 'req'. - * - * The status of the reply is set to 'error' (that must be NULL on success). - * Its send the object 'obj' (can be NULL) with an - * informational comment 'info (can also be NULL). - * - * For convenience, the function calls 'json_object_put' for 'obj'. - * Thus, in the case where 'obj' should remain available after - * the function returns, the function 'json_object_get' shall be used. - * - * @param req the request - * @param obj the replied object or NULL - * @param error the error message if it is a reply error or NULL - * @param info an informative text or NULL - * - * @see afb_req_reply_v - * @see afb_req_reply_f - */ -void afb_req_reply( - afb_req_t req, - struct json_object *obj, - const char *error, - const char *info); -``` - -### afb_req_reply_v - -```C -/** - * Same as 'afb_req_reply_f' but the arguments to the format 'info' - * are given as a variable argument list instance. - * - * For convenience, the function calls 'json_object_put' for 'obj'. - * Thus, in the case where 'obj' should remain available after - * the function returns, the function 'json_object_get' shall be used. - * - * @param req the request - * @param obj the replied object or NULL - * @param error the error message if it is a reply error or NULL - * @param info an informative text containing a format as for vprintf - * @param args the va_list of arguments to the format as for vprintf - * - * @see afb_req_reply - * @see afb_req_reply_f - * @see vprintf - */ -void afb_req_reply_v( - afb_req_t req, - struct json_object *obj, - const char *error, - const char *info, - va_list args); -``` - -### afb_req_reply_f - -```C -/** - * Same as 'afb_req_reply' but the 'info' is a formatting - * string followed by arguments. - * - * For convenience, the function calls 'json_object_put' for 'obj'. - * Thus, in the case where 'obj' should remain available after - * the function returns, the function 'json_object_get' shall be used. - * - * @param req the request - * @param obj the replied object or NULL - * @param error the error message if it is a reply error or NULL - * @param info an informative text containing a format as for printf - * @param ... the arguments to the format as for printf - * - * @see afb_req_reply - * @see afb_req_reply_v - * @see printf - */ -void afb_req_reply_f( - afb_req_t req, - struct json_object *obj, - const char *error, - const char *info, - ...); -``` - -## Subcall functions - - - -### afb_req_subcall - -```C -/** - * Calls the 'verb' of the 'api' with the arguments 'args' and 'verb' in the name of the binding. - * The result of the call is delivered to the 'callback' function with the 'callback_closure'. - * - * For convenience, the function calls 'json_object_put' for 'args'. - * Thus, in the case where 'args' should remain available after - * the function returns, the function 'json_object_get' shall be used. - * - * The 'callback' receives 5 arguments: - * 1. 'closure' the user defined closure pointer 'closure', - * 2. 'object' a JSON object returned (can be NULL) - * 3. 'error' a string not NULL in case of error - * 4. 'info' a string handling some info (can be NULL) - * 5. 'req' the req - * - * NOTE: For convenience, *json_object_put* is called on 'object' after the - * callback returns. So, it is wrong to call *json_object_put* in the callback. - * - * @param req The request - * @param api The api name of the method to call - * @param verb The verb name of the method to call - * @param args The arguments to pass to the method - * @param flags The bit field of flags for the subcall as defined by @ref afb_req_subcall_flags_t - * @param callback The to call on completion - * @param closure The closure to pass to the callback - * - * The flags are any combination of the following values: - * - * - afb_req_x2_subcall_catch_events = 1 - * - * the calling API wants to receive the events from subscription - * - * - afb_req_x2_subcall_pass_events = 2 - * - * the original request will receive the events from subscription - * - * - afb_req_x2_subcall_on_behalf = 4 - * - * the calling API wants to use the credentials of the original request - * - * - afb_req_x2_subcall_api_session = 8 - * - * the calling API wants to use its session instead of the one of the - * original request - * - * @see also 'afb_req_subcall_sync' - */ -void afb_req_subcall( - afb_req_t req, - const char *api, - const char *verb, - struct json_object *args, - int flags, - void (*callback)( - void *closure, - struct json_object *object, - const char *error, - const char * info, - afb_req_t req), - void *closure); -``` - -### afb_req_subcall_sync - -```C -/** - * Makes a call to the method of name 'api' / 'verb' with the object 'args'. - * This call is made in the context of the request 'req'. - * This call is synchronous, it waits untill completion of the request. - * It returns 0 on success or a negative value on error answer. - * - * For convenience, the function calls 'json_object_put' for 'args'. - * Thus, in the case where 'args' should remain available after - * the function returns, the function 'json_object_get' shall be used. - * - * See also: - * - 'afb_req_subcall_req' that is convenient to keep request alive automatically. - * - 'afb_req_subcall' that doesn't keep request alive automatically. - * - * @param req The request - * @param api The api name of the method to call - * @param verb The verb name of the method to call - * @param args The arguments to pass to the method - * @param flags The bit field of flags for the subcall as defined by @ref afb_req_subcall_flags - * @param object a pointer where the replied JSON object is stored must be freed using @ref json_object_put (can be NULL) - * @param error a pointer where a copy of the replied error is stored must be freed using @ref free (can be NULL) - * @param info a pointer where a copy of the replied info is stored must be freed using @ref free (can be NULL) - * - * @return 0 in case of success or -1 in case of error - */ -int afb_req_subcall_sync( - afb_req_t req, - const char *api, - const char *verb, - struct json_object *args, - int flags, - struct json_object **object, - char **error, - char **info); -``` - -## Event functions - -### afb_req_subscribe - -```C -/** - * Establishes for the client link identified by 'req' a subscription - * to the 'event'. - * - * Establishing subscription MUST be called BEFORE replying to the request. - * - * @param req the request - * @param event the event to subscribe - * - * @return 0 in case of successful subscription or -1 in case of error. - */ -int afb_req_subscribe( - afb_req_t req, - afb_event_t event); -``` - -### afb_req_unsubscribe - -```C -/** - * Revokes the subscription established to the 'event' for the client - * link identified by 'req'. - * Returns 0 in case of successful subscription or -1 in case of error. - * - * Revoking subscription MUST be called BEFORE replying to the request. - * - * @param req the request - * @param event the event to revoke - * - * @return 0 in case of successful subscription or -1 in case of error. - */ -int afb_req_unsubscribe( - afb_req_t req, - afb_event_t event); -``` - -## Session functions - -### afb_req_context - -```C -/** - * Manage the pointer stored by the binding for the client session of 'req'. - * - * If no previous pointer is stored or if 'replace' is not zero, a new value - * is generated using the function 'create_context' called with the 'closure'. - * If 'create_context' is NULL the generated value is 'closure'. - * - * When a value is created, the function 'free_context' is recorded and will - * be called (with the created value as argument) to free the created value when - * it is not more used. - * - * This function is atomic: it ensures that 2 threads will not race together. - * - * @param req the request - * @param replace if not zero an existing value is replaced - * @param create_context the creation function or NULL - * @param free_context the destroying function or NULL - * @param closure the closure to the creation function - * - * @return the stored value - */ -void *afb_req_context( - afb_req_t req, - int replace, - void *(*create_context)(void *closure), - void (*free_context)(void*), - void *closure); -``` - -### afb_req_context_get - -```C -/** - * Gets the pointer stored by the binding for the session of 'req'. - * When the binding has not yet recorded a pointer, NULL is returned. - * - * Shortcut for: afb_req_context(req, 0, NULL, NULL, NULL) - * - * @param req the request - * - * @return the previously stored value - */ -void *afb_req_context_get( - afb_req_t req); -``` - -### afb_req_context_set - -```C -/** - * Stores for the binding the pointer 'context' to the session of 'req'. - * The function 'free_context' will be called when the session is closed - * or if binding stores an other pointer. - * - * Shortcut for: afb_req_context(req, 1, NULL, free_context, context) - * - * - * @param req the request - * @param context the context value to store - * @param free_context the cleaning function for the stored context (can be NULL) - */ -void afb_req_context_set( - afb_req_t req, - void *context, - void (*free_context)(void*)); -``` - -### afb_req_context_clear - -```C -/** - * Frees the pointer stored by the binding for the session of 'req' - * and sets it to NULL. - * - * Shortcut for: afb_req_context_set(req, NULL, NULL) - * - * @param req the request - */ -void afb_req_context_clear( - afb_req_t req); -``` - -### afb_req_session_close - -```C -/** - * Closes the session associated with 'req' - * and delete all associated contexts. - * - * @param req the request - */ -void afb_req_session_close( - afb_req_t req); -``` - -### afb_req_session_set_LOA - -```C -/** - * Sets the level of assurance of the session of 'req' - * to 'level'. The effect of this function is subject of - * security policies. - * - * @param req the request - * @param level of assurance from 0 to 7 - * - * @return 0 on success or -1 if failed. - */ -int afb_req_session_set_LOA( - afb_req_t req, - unsigned level); -``` - -## Credential/client functions - -### afb_req_has_permission - -```C -/** - * Check whether the 'permission' is granted or not to the client - * identified by 'req'. - * - * @param req the request - * @param permission string to check - * - * @return 1 if the permission is granted or 0 otherwise. - */ -int afb_req_has_permission( - afb_req_t req, - const char *permission); -``` - -### afb_req_get_application_id - -```C -/** - * Get the application identifier of the client application for the - * request 'req'. - * - * Returns the application identifier or NULL when the application - * can not be identified. - * - * The returned value if not NULL must be freed by the caller - * - * @param req the request - * - * @return the string for the application id of the client MUST BE FREED - */ -char *afb_req_get_application_id( - afb_req_t req); -``` - -### afb_req_get_uid - -```C -/** - * Get the user identifier (UID) of the client for the - * request 'req'. - * - * @param req the request - * - * @return -1 when the application can not be identified or the unix uid. - * - */ -int afb_req_get_uid( - afb_req_t req); -``` - -### afb_req_get_client_info - -```C -/** - * Get informations about the client of the - * request 'req'. - * - * Returns an object with client informations: - * { - * "pid": int, "uid": int, "gid": int, - * "label": string, "id": string, "user": string, - * "uuid": string, "LOA": int - * } - * - * If some of this information can't be computed, the field of the return - * object will not be set at all. - * - * @param req the request - * - * @return a JSON object that must be freed using @ref json_object_put - */ -struct json_object *afb_req_get_client_info( - afb_req_t req); -``` - -## Legacy functions - -### afb_req_subcall_legacy - -```C -/** - * @deprecated use @ref afb_req_subcall - * - * Makes a call to the method of name 'api' / 'verb' with the object 'args'. - * This call is made in the context of the request 'req'. - * On completion, the function 'callback' is invoked with the - * 'closure' given at call and two other parameters: 'iserror' and 'result'. - * 'status' is 0 on success or negative when on an error reply. - * 'result' is the json object of the reply, you must not call json_object_put - * on the result. - * - * For convenience, the function calls 'json_object_put' for 'args'. - * Thus, in the case where 'args' should remain available after - * the function returns, the function 'json_object_get' shall be used. - * - * @param req the request - * @param api the name of the api to call - * @param verb the name of the verb to call - * @param args the arguments of the call as a JSON object - * @param callback the call back that will receive the reply - * @param closure the closure passed back to the callback - * - * @see afb_req_subcall - * @see afb_req_subcall_sync - */ -void afb_req_subcall_legacy( - afb_req_t req, - const char *api, - const char *verb, - struct json_object *args, - void (*callback)( - void *closure, - int iserror, - struct json_object *result, - afb_req_t req), - void *closure); -``` - -### afb_req_subcall_sync_legacy - -```C -/** - * @deprecated use @ref afb_req_subcall_sync - * - * Makes a call to the method of name 'api' / 'verb' with the object 'args'. - * This call is made in the context of the request 'req'. - * This call is synchronous, it waits until completion of the request. - * It returns 0 on success or a negative value on error answer. - * The object pointed by 'result' is filled and must be released by the caller - * after its use by calling 'json_object_put'. - * - * For convenience, the function calls 'json_object_put' for 'args'. - * Thus, in the case where 'args' should remain available after - * the function returns, the function 'json_object_get' shall be used. - * - * @param req the request - * @param api the name of the api to call - * @param verb the name of the verb to call - * @param args the arguments of the call as a JSON object - * @param result the pointer to the JSON object pointer that will receive the result - * - * @return 0 on success or a negative value on error answer. - * - * @see afb_req_subcall - * @see afb_req_subcall_sync - */ -int afb_req_subcall_sync_legacy( - afb_req_t req, - const char *api, - const char *verb, - struct json_object *args, - struct json_object **result); -``` - |