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Diffstat (limited to 'docs/reference-v3')
| -rw-r--r-- | docs/reference-v3/func-api.md | 937 | ||||
| -rw-r--r-- | docs/reference-v3/func-daemon.md | 146 | ||||
| -rw-r--r-- | docs/reference-v3/func-event.md | 108 | ||||
| -rw-r--r-- | docs/reference-v3/func-req.md | 835 | ||||
| -rw-r--r-- | docs/reference-v3/func-service.md | 59 | ||||
| -rw-r--r-- | docs/reference-v3/macro-log.md | 53 | ||||
| -rw-r--r-- | docs/reference-v3/types-and-globals.md | 243 |
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diff --git a/docs/reference-v3/func-api.md b/docs/reference-v3/func-api.md new file mode 100644 index 00000000..0ba141df --- /dev/null +++ b/docs/reference-v3/func-api.md @@ -0,0 +1,937 @@ +Functions of class **afb_api** +============================ + +## General functions + +### afb_api_name + +```C +/** + * Get the name of the 'api'. + * + * @param api the api whose name is to be returned + * + * @return the name of the api. + * + * The returned value must not be changed nor freed. + */ +const char *afb_api_name( + afb_api_t api); +``` + +### afb_api_get_userdata + +```C +/** + * Get the "userdata" pointer of the 'api' + * + * @param api the api whose user's data is to be returned + * + * @return the user's data pointer of the api. + * + * @see afb_api_set_userdata + */ +void *afb_api_get_userdata( + afb_api_t api); +``` + +### afb_api_set_userdata + +```C +/** + * Set the "userdata" pointer of the 'api' to 'value' + * + * @param api the api whose user's data is to be set + * @param value the data to set + * + * @see afb_api_get_userdata + */ +void afb_api_set_userdata( + afb_api_t api, + void *value); +``` + +### afb_api_require_api + +```C +/** + * Check that it requires the API of 'name'. + * If 'initialized' is not zero it request the API to be + * initialized, implying its initialization if needed. + * + * Calling this function is only allowed within init. + * + * A single request allows to require multiple apis. + * + * @param api the api that requires the other api by its name + * @param name a space separated list of required api names + * @param initialized if zero, the api is just required to exist. If not zero, + * the api is required to exist and to be initialized at return of the call + * (initializing it if needed and possible as a side effect of the call). + * + * @return 0 in case of success or -1 in case of error with errno set appropriately. + */ +int afb_api_require_api( + afb_api_t api, + const char *name, + int initialized); +``` + + +## Verbosity functions + +### afb_api_wants_log_level + +```C +/** + * Is the log message of 'level (as defined for syslog) required for the api? + * + * @param api the api to check + * @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_api_wants_log_level( + afb_api_t api, + int level); +``` + +### afb_api_vverbose + +```C +/** + * Send to the journal with the logging 'level' a message described + * by 'fmt' applied to the va-list 'args'. + * + * 'file', 'line' and 'func' are indicators of code position 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 api the api that collects the logging message + * @param level the level of the message + * @param file the source file that logs the messages or NULL + * @param line the line in the source file that logs the message + * @param func the name of the function in the source file that logs + * @param fmt the format of the message as in printf + * @param args the arguments to the format string of the message as a va_list + * + * @see syslog + * @see printf + */ +void afb_api_vverbose( + afb_api_t api, + int level, + const char *file, + int line, + const char *func, + const char *fmt, + va_list args); +``` + +### afb_api_verbose + +```C +/** + * Send to the journal with the log 'level' a message described + * by 'fmt' and following parameters. + * + * '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 api the api that collects the logging message + * @param level the level of the message + * @param file the source file that logs the messages or NULL + * @param line the line in the source file that logs the message + * @param func the name of the function in the source file that logs + * @param fmt the format of the message as in printf + * @param ... the arguments to the format string of the message + * + * @see syslog + * @see printf + */ +void afb_api_verbose( + afb_api_t api, + int level, + const char *file, + int line, + const char *func, + const char *fmt, + ...); +``` + +## Data retrieval functions + +### afb_api_rootdir_get_fd + +```C +/** + * Get the root directory file descriptor. This file descriptor can + * be used with functions 'openat', 'fstatat', ... + * + * CAUTION, manipulate this this descriptor with care, in particular, don't close + * it. + * + * This can be used to get the path of the root directory using: + * + * char buffer[MAX_PATH], proc[100]; + * int dirfd = afb_api_rootdir_get_fd(api); + * snprintf(proc, sizeof proc, "/proc/self/fd/%d", dirfd); + * readlink(proc, buffer, sizeof buffer); + * + * But note that within AGL this is the value given by the environment variable + * AFM_APP_INSTALL_DIR. + * + * @param api the api that uses the directory file descriptor + * + * @return the file descriptor of the root directory. + * + * @see afb_api_rootdir_open_locale + */ +int afb_api_rootdir_get_fd( + afb_api_t api); +``` + +### afb_api_rootdir_open_locale + +```C +/** + * Opens 'filename' within the root directory with 'flags' (see function openat) + * using the 'locale' definition (example: "jp,en-US") that can be NULL. + * + * The filename must be relative to the root of the bindings. + * + * The opening mode must be for read or write but not for O_CREAT. + * + * The definition of locales and of how files are searched can be checked + * here: https://www.w3.org/TR/widgets/#folder-based-localization + * and https://tools.ietf.org/html/rfc7231#section-5.3.5 + * + * @param api the api that queries the file + * @param filename the relative path to the file to open + * @param flags the flags for opening as for C function 'open' + * @param locale string indicating how to search content, can be NULL + * + * @return the file descriptor or -1 in case of error and errno is set with the + * error indication. + * + * @see open + * @see afb_api_rootdir_get_fd + */ +int afb_api_rootdir_open_locale( + afb_api_t api, + const char *filename, + int flags, + const char *locale); +``` + +## Calls and job functions + +### afb_api_call + +```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 but NULL on success + * 4. 'info' a string handling some info (can be NULL) + * 5. 'api' the api + * + * @param api The api that makes the call + * @param apiname 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 callback The to call on completion + * @param closure The closure to pass to the callback + * + * + * @see afb_req_subcall + * @see afb_req_subcall_sync + * @see afb_api_call_sync + */ +void afb_api_call( + afb_api_t api, + const char *apiname, + const char *verb, + struct json_object *args, + void (*callback)( + void *closure, + struct json_object *object, + const char *error, + const char * info, + afb_api_t api), + void *closure); +``` + +### afb_api_call_sync + +```C +/** + * Calls the 'verb' of the 'api' with the arguments 'args' and 'verb' in the name of the binding. + * 'result' will receive the response. + * + * 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 api The api that makes the call + * @param apiname 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 object Where to store the returned object - should call json_object_put on it - can be NULL + * @param error Where to store the copied returned error - should call free on it - can be NULL + * @param info Where to store the copied returned info - should call free on it - can be NULL + * + * @returns 0 in case of success or a negative value in case of error. + * + * @see afb_req_subcall + * @see afb_req_subcall_sync + * @see afb_api_call + */ +int afb_api_call_sync( + afb_api_t api, + const char *apiname, + const char *verb, + struct json_object *args, + struct json_object **object, + char **error, + char **info); +``` + +### afb_api_queue_job + +```C +/** + * Queue the job defined by 'callback' and 'argument' for being executed asynchronously + * in this thread (later) or in an other thread. + * + * If 'group' is not NULL, the jobs queued with a same value (as the pointer value 'group') + * are executed in sequence in the order of there submission. + * + * If 'timeout' is not 0, it represent the maximum execution time for the job in seconds. + * At first, the job is called with 0 as signum and the given argument. + * + * The job is executed with the monitoring of its time and some signals like SIGSEGV and + * SIGFPE. When a such signal is catched, the job is terminated and reexecuted but with + * signum being the signal number (SIGALRM when timeout expired). + * + * When executed, the callback function receives 2 arguments: + * + * - int signum: the signal catched if any or zero at the beginning + * - void *arg: the parameter 'argument' + * + * A typical implementation of the job callback is: + * + * void my_job_cb(int signum, void *arg) + * { + * struct myarg_t *myarg = arg; + * if (signum) + * AFB_API_ERROR(myarg->api, "job interrupted with signal %s", strsignal(signum)); + * else + * really_do_my_job(myarg); + * } + * + * @param api the api that queue the job + * @param callback the job as a callback function + * @param argument the argument to pass to the queued job + * @param group the group of the job, NULL if no group + * @param timeout the timeout of execution of the job + * + * @return 0 in case of success or -1 in case of error with errno set appropriately. + */ +int afb_api_queue_job( + afb_api_t api, + void (*callback)(int signum, void *arg), + void *argument, + void *group, + int timeout); +``` + +## Event functions + +### afb_api_broadcast_event + +```C +/** + * Broadcasts widely the event of 'name' with the data 'object'. + * 'object' can be NULL. + * + * For convenience, the function calls 'json_object_put' for 'object'. + * Thus, in the case where 'object' should remain available after + * the function returns, the function 'json_object_get' shall be used. + * + * Calling this function is only forbidden during preinit. + * + * The event sent as the name API/name where API is the name of the + * api. + * + * @param api the api that broadcast the event + * @param name the event name suffix + * @param object the object that comes with the event + * + * @return the count of clients that received the event. + */ +int afb_api_broadcast_event( + afb_api_t api, + const char *name, + struct json_object *object); +``` + +### afb_api_make_event + +```C +/** + * Creates an event of 'name' and returns it. + * + * Calling this function is only forbidden during preinit. + * + * See afb_event_is_valid to check if there is an error. + * + * The event created as the name API/name where API is the name of the + * api. + * + * @param api the api that creates the event + * @param name the event name suffix + * + * @return the created event. Use the function afb_event_is_valid to check + * whether the event is valid (created) or not (error as reported by errno). + * + * @see afb_event_is_valid + */ +afb_event_t afb_api_make_event( + afb_api_t api, + const char *name); +``` + +### afb_api_event_handler_add + +```C +/** + * Add a specific event handler for the api + * + * The handler callback is called when an event matching the given pattern + * is received (it is received if broadcasted or after subscription through + * a call or a subcall). + * + * The handler callback receive 4 arguments: + * + * - the closure given here + * - the event full name + * - the companion JSON object of the event + * - the api that subscribed the event + * + * @param api the api that creates the handler + * @param pattern the global pattern of the event to handle + * @param callback the handler callback function + * @param closure the closure of the handler + * + * @return 0 in case of success or -1 on failure with errno set + * + * @see afb_api_on_event + * @see afb_api_event_handler_del + */ +int afb_api_event_handler_add( + afb_api_t api, + const char *pattern, + void (*callback)( + void *, + const char*, + struct json_object*, + afb_api_t), + void *closure); +``` + +### afb_api_event_handler_del + +```C +/** + * Delete a specific event handler for the api + * + * @param api the api that the handler belongs to + * @param pattern the global pattern of the handler to remove + * @param closure if not NULL it will receive the closure set to the handler + * + * @return 0 in case of success or -1 on failure with errno set + * + * @see afb_api_on_event + * @see afb_api_event_handler_add + */ +int afb_api_event_handler_del( + afb_api_t api, + const char *pattern, + void **closure); + +``` + +## Systemd functions + +### afb_api_get_event_loop + +```C +/** + * Retrieves the common systemd's event loop of AFB + * + * @param api the api that uses the event loop + * + * @return the systemd event loop if active, NULL otherwise + * + * @see afb_api_get_user_bus + * @see afb_api_get_system_bus + */ +struct sd_event *afb_api_get_event_loop( + afb_api_t api); +``` + +### afb_api_get_user_bus + +```C +/** + * Retrieves the common systemd's user/session d-bus of AFB + * + * @param api the api that uses the user dbus + * + * @return the systemd user connection to dbus if active, NULL otherwise + * + * @see afb_api_get_event_loop + * @see afb_api_get_system_bus + */ +struct sd_bus *afb_api_get_user_bus( + afb_api_t api); +``` + +### afb_api_get_system_bus + +```C +/** + * Retrieves the common systemd's system d-bus of AFB + * + * @param api the api that uses the system dbus + * + * @return the systemd system connection to dbus if active, NULL otherwise + * + * @see afb_api_get_event_loop + * @see afb_api_get_user_bus + */ +struct sd_bus *afb_api_get_system_bus( + afb_api_t api); +``` + + +## Dynamic api functions + +### afb_api_new_api + +```C +/** + * Creates a new api of name 'apiname' briefly described by 'info' (that can + * be NULL). + * + * When the pre-initialization function is given, it is a function that + * receives 2 parameters: + * + * - the closure as given in the call + * - the created api that can be initialised + * + * This pre-initialization function must return a negative value to abort + * the creation of the api. Otherwise, it returns a non-negative value to + * continue. + * + * @param api the api that creates the other one + * @param apiname the name of the new api + * @param info the brief description of the new api (can be NULL) + * @param noconcurrency zero or not zero whether the new api is reentrant or not + * @param preinit the pre-initialization function if any (can be NULL) + * @param closure the closure for the pre-initialization \ref preinit + * + * @return 0 in case of success or -1 on failure with errno set + * + * @see afb_api_delete_api + */ +afb_api_t afb_api_new_api( + afb_api_t api, + const char *apiname, + const char *info, + int noconcurrency, + int (*preinit)(void*, afb_api_t ), + void *closure); +``` + +### afb_api_set_verbs_v2 + +```C +/** + * @deprecated use @ref afb_api_set_verbs_v3 instead + * + * Set the verbs of the 'api' using description of verbs of the api v2 + * + * @param api the api that will get the verbs + * @param verbs the array of verbs to add terminated with an item with name=NULL + * + * @return 0 in case of success or -1 on failure with errno set + * + * @see afb_verb_v2 + * @see afb_api_add_verb + * @see afb_api_set_verbs_v3 + */ +int afb_api_set_verbs_v2( + afb_api_t api, + const struct afb_verb_v2 *verbs); +``` + +### afb_api_set_verbs_v3 + +```C +/** + * Set the verbs of the 'api' using description of verbs of the api v2 + * + * @param api the api that will get the verbs + * @param verbs the array of verbs to add terminated with an item with name=NULL + * + * @return 0 in case of success or -1 on failure with errno set + * + * @see afb_verb_v3 + * @see afb_api_add_verb + * @see afb_api_del_verb + */ +int afb_api_set_verbs_v3( + afb_api_t api, + const struct afb_verb_v3 *verbs); +``` + +### afb_api_add_verb + +```C +/** + * Add one verb to the dynamic set of the api + * + * @param api the api to change + * @param verb name of the verb + * @param info brief description of the verb, can be NULL + * @param callback callback function implementing the verb + * @param vcbdata data for the verb callback, available through req + * @param auth required authorization, can be NULL + * @param session authorization and session requirements of the verb + * @param glob is the verb glob name + * + * @return 0 in case of success or -1 on failure with errno set + * + * @see afb_verb_v3 + * @see afb_api_del_verb + * @see afb_api_set_verbs_v3 + * @see fnmatch for matching names using glob + */ +int afb_api_add_verb( + afb_api_t api, + const char *verb, + const char *info, + void (*callback)(struct afb_req_x2 *req), + void *vcbdata, + const struct afb_auth *auth, + uint32_t session, + int glob); +``` + +### afb_api_del_verb + +```C +/** + * Delete one verb from the dynamic set of the api + * + * @param api the api to change + * @param verb name of the verb to delete + * @param vcbdata if not NULL will receive the vcbdata of the deleted verb + * + * @return 0 in case of success or -1 on failure with errno set + * + * @see afb_api_add_verb + */ +int afb_api_del_verb( + afb_api_t api, + const char *verb, + void **vcbdata); +``` + +### afb_api_on_event + +```C +/** + * Set the callback 'onevent' to process events in the name of the 'api'. + * + * This setting can be done statically using the global variable + * @ref afbBindingV3. + * + * This function replace any previously global event callback set. + * + * When an event is received, the callback 'onevent' is called with 3 parameters + * + * - the api that recorded the event handler + * - the full name of the event + * - the companion JSON object of the event + * + * @param api the api that wants to process events + * @param onevent the callback function that will process events (can be NULL + * to remove event callback) + * + * @return 0 in case of success or -1 on failure with errno set + * + * @see afbBindingV3 + * @see afb_binding_v3 + * @see afb_api_event_handler_add + * @see afb_api_event_handler_del + */ +int afb_api_on_event( + afb_api_t api, + void (*onevent)( + afb_api_t api, + const char *event, + struct json_object *object)); +``` + +### afb_api_on_init + +```C +/** + * Set the callback 'oninit' to process initialization of the 'api'. + * + * This setting can be done statically using the global variable + * @ref afbBindingV3 + * + * This function replace any previously initialization callback set. + * + * This function is only valid during the pre-initialization stage. + * + * The callback initialization function will receive one argument: the api + * to initialize. + * + * @param api the api that wants to process events + * @param oninit the callback function that initialize the api + * + * @return 0 in case of success or -1 on failure with errno set + * + * @see afbBindingV3 + * @see afb_binding_v3 + */ +int afb_api_on_init( + afb_api_t api, + int (*oninit)(afb_api_t api)); +``` + +### afb_api_provide_class + +```C +/** + * Tells that the api provides a class of features. Classes are intended to + * allow ordering of initializations: apis that provides a given class are + * initialized before apis requiring it. + * + * This function is only valid during the pre-initialization stage. + * + * @param api the api that provides the classes + * @param name a space separated list of the names of the provided classes + * + * @returns 0 in case of success or a negative value in case of error. + * + * @see afb_api_require_class + */ +int afb_api_provide_class( + afb_api_t api, + const char *name); +``` + +### afb_api_require_class + +```C +/** + * Tells that the api requires a set of class features. Classes are intended to + * allow ordering of initializations: apis that provides a given class are + * initialized before apis requiring it. + * + * This function is only valid during the pre-initialization stage. + * + * @param api the api that requires the classes + * @param name a space separated list of the names of the required classes + * + * @returns 0 in case of success or a negative value in case of error. + * + * @see afb_api_provide_class + */ +int afb_api_require_class( + afb_api_t api, + const char *name); +``` + +### afb_api_seal + +```C +/** + * Seal the api. After a call to this function the api can not be modified + * anymore. + * + * @param api the api to be sealed + */ +void afb_api_seal( + afb_api_t api); +``` + +### afb_api_delete_api + +```C +/** + * Delete the given api. + * + * It is of the responsibility of the caller to don't used the deleted api + * anymore after this function returned. + * + * @param api the api to delete + * + * @returns 0 in case of success or a negative value in case of error. + * + * @see afb_api_new_api + */ +int afb_api_delete_api( + afb_api_t api); +``` + +### afb_api_add_alias + +```C +/** + * Create an aliased name 'as_name' for the api 'name'. + * Calling this function is only allowed within preinit. + * + * @param api the api that requires the aliasing + * @param name the api to alias + * @param as_name the aliased name of the aliased api + * + * @return 0 in case of success or -1 in case of error with errno set appropriately. + */ +int afb_api_add_alias( + afb_api_t api, + const char *name, + const char *as_name); +``` + + +## Legacy functions + +The function for legacy calls are still provided for some time because +adaptation of existing code to the new call functions require a small amount +of work. + +### afb_api_call_legacy + +```C +/** + * @deprecated try to use @ref afb_api_call instead + * + * * 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 3 arguments: + * 1. 'closure' the user defined closure pointer 'closure', + * 2. 'status' a status being 0 on success or negative when an error occurred, + * 2. 'result' the resulting data as a JSON object. + * + * @param api The api + * @param apiname 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 callback The to call on completion + * @param closure The closure to pass to the callback + * + * @see also 'afb_api_call' + * @see also 'afb_api_call_sync' + * @see also 'afb_api_call_sync_legacy' + * @see also 'afb_req_subcall' + * @see also 'afb_req_subcall_sync' + */ +void afb_api_call_legacy( + afb_api_t api, + const char *apiname, + const char *verb, + struct json_object *args, + void (*callback)( + void *closure, + int status, + struct json_object *result, + afb_api_t api), + void *closure); +``` + +### afb_api_call_sync_legacy + +```C +/** + * @deprecated try to use @ref afb_api_call_sync instead + * + * Calls the 'verb' of the 'api' with the arguments 'args' and 'verb' in the name of the binding. + * 'result' will receive the response. + * + * 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 api The api + * @param apiname 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 result Where to store the result - should call json_object_put on it - + * + * @returns 0 in case of success or a negative value in case of error. + * + * @see also 'afb_api_call' + * @see also 'afb_api_call_sync' + * @see also 'afb_api_call_legacy' + * @see also 'afb_req_subcall' + * @see also 'afb_req_subcall_sync' + */ +int afb_api_call_sync_legacy( + afb_api_t api, + const char *apiname, + const char *verb, + struct json_object *args, + struct json_object **result); +``` + diff --git a/docs/reference-v3/func-daemon.md b/docs/reference-v3/func-daemon.md new file mode 100644 index 00000000..11f44fbf --- /dev/null +++ b/docs/reference-v3/func-daemon.md @@ -0,0 +1,146 @@ +Functions of class **afb_daemon** +============================ + +All the functions of the class **afb_daemon** use the default api. +This are internally aliased to the corresponding function of class afb_api_t. + +```C +/** + * Retrieves the common systemd's event loop of AFB + */ +struct sd_event *afb_daemon_get_event_loop(); + +/** + * Retrieves the common systemd's user/session d-bus of AFB + */ +struct sd_bus *afb_daemon_get_user_bus(); + +/** + * Retrieves the common systemd's system d-bus of AFB + */ +struct sd_bus *afb_daemon_get_system_bus(); + +/** + * Broadcasts widely the event of 'name' with the data 'object'. + * 'object' can be NULL. + * + * For convenience, the function calls 'json_object_put' for 'object'. + * Thus, in the case where 'object' should remain available after + * the function returns, the function 'json_object_get' shall be used. + * + * Calling this function is only forbidden during preinit. + * + * Returns the count of clients that received the event. + */ +int afb_daemon_broadcast_event( + const char *name, + struct json_object *object); + +/** + * Creates an event of 'name' and returns it. + * + * Calling this function is only forbidden during preinit. + * + * See afb_event_is_valid to check if there is an error. + */ +afb_event_t afb_daemon_make_event( + const char *name); + +/** + * @deprecated use bindings version 3 + * + * Send 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 + */ +void afb_daemon_verbose( + int level, + const char *file, + int line, + const char * func, + const char *fmt, + ...); + +/** + * @deprecated use bindings version 3 + * + * Get the root directory file descriptor. This file descriptor can + * be used with functions 'openat', 'fstatat', ... + * + * Returns the file descriptor or -1 in case of error. + */ +int afb_daemon_rootdir_get_fd(); + +/** + * Opens 'filename' within the root directory with 'flags' (see function openat) + * using the 'locale' definition (example: "jp,en-US") that can be NULL. + * + * Returns the file descriptor or -1 in case of error. + */ +int afb_daemon_rootdir_open_locale( + const char *filename, + int flags, + const char *locale); + +/** + * Queue the job defined by 'callback' and 'argument' for being executed asynchronously + * in this thread (later) or in an other thread. + * If 'group' is not NUL, the jobs queued with a same value (as the pointer value 'group') + * are executed in sequence in the order of there submission. + * If 'timeout' is not 0, it represent the maximum execution time for the job in seconds. + * At first, the job is called with 0 as signum and the given argument. + * The job is executed with the monitoring of its time and some signals like SIGSEGV and + * SIGFPE. When a such signal is catched, the job is terminated and reexecuted but with + * signum being the signal number (SIGALRM when timeout expired). + * + * Returns 0 in case of success or -1 in case of error. + */ +int afb_daemon_queue_job( + void (*callback)(int signum, void *arg), + void *argument, + void *group, + int timeout); + +/** + * Tells that it requires the API of "name" to exist + * and if 'initialized' is not null to be initialized. + * Calling this function is only allowed within init. + * + * Returns 0 in case of success or -1 in case of error. + */ +int afb_daemon_require_api( + const char *name, + int initialized); + +/** + * Create an aliased name 'as_name' for the api 'name'. + * Calling this function is only allowed within preinit. + * + * Returns 0 in case of success or -1 in case of error. + */ +int afb_daemon_add_alias(const char *name, const char *as_name); + +/** + * Creates a new api of name 'api' with brief 'info'. + * + * Returns 0 in case of success or -1 in case of error. + */ +int afb_daemon_new_api( + const char *api, + const char *info, + int noconcurrency, + int (*preinit)(void*, struct afb_api_x3 *), + void *closure); +``` diff --git a/docs/reference-v3/func-event.md b/docs/reference-v3/func-event.md new file mode 100644 index 00000000..90c172d8 --- /dev/null +++ b/docs/reference-v3/func-event.md @@ -0,0 +1,108 @@ +Functions of class afb_event_t +============================== + +## General functions + +### afb_event_is_valid + +```C +/** + * Checks whether the 'event' is valid or not. + * + * @param event the event to check + * + * @return 0 if not valid or 1 if valid. + */ +int afb_event_is_valid( + afb_event_t event); +``` + +### afb_event_name + +```C +/** + * Gets the name associated to 'event'. + * + * @param event the event whose name is requested + * + * @return the name of the event + * + * The returned name can be used until call to 'afb_event_unref'. + * It shouldn't be freed. + */ +const char *afb_event_name( + afb_event_t event); +``` + +### afb_event_unref + +```C +/** + * Decrease the count of references to 'event'. + * Call this function when the evenid is no more used. + * It destroys the event_x2 when the reference count falls to zero. + * + * @param event the event + */ +void afb_event_unref( + afb_event_t event); +``` + +### afb_event_addref + +```C +/** + * Increases the count of references to 'event' + * + * @param event the event + * + * @return the event + */ +afb_event_t *afb_event_addref( + afb_event_t event); +``` + +## Pushing functions + +### afb_event_broadcast + +```C +/** + * Broadcasts widely an event of 'event' with the data 'object'. + * 'object' can be NULL. + * + * For convenience, the function calls 'json_object_put' for 'object'. + * Thus, in the case where 'object' should remain available after + * the function returns, the function 'json_object_get' shall be used. + * + * @param event the event to broadcast + * @param object the companion object to associate to the broadcasted event (can be NULL) + * + * @return the count of clients that received the event. + */ +int afb_event_broadcast( + afb_event_t event, + struct json_object *object); +``` + +### afb_event_push + +```C +/** + * Pushes an event of 'event' with the data 'object' to its observers. + * 'object' can be NULL. + * + * For convenience, the function calls 'json_object_put' for 'object'. + * Thus, in the case where 'object' should remain available after + * the function returns, the function 'json_object_get' shall be used. + * + * @param event the event to push + * @param object the companion object to associate to the pushed event (can be NULL) + * + * @return the count of clients that received the event. + */ +int afb_event_push( + afb_event_t event, + struct json_object *object); +``` + diff --git a/docs/reference-v3/func-req.md b/docs/reference-v3/func-req.md new file mode 100644 index 00000000..bdec581f --- /dev/null +++ b/docs/reference-v3/func-req.md @@ -0,0 +1,835 @@ +Functions of class afb_req_t +============================ + +## 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 + * + * @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'. + * + * @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. + * + * @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 untill 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); +``` + diff --git a/docs/reference-v3/func-service.md b/docs/reference-v3/func-service.md new file mode 100644 index 00000000..b18c486c --- /dev/null +++ b/docs/reference-v3/func-service.md @@ -0,0 +1,59 @@ +Functions of class afb_service +============================== + +All the functions of the class **afb_daemon** use the default api. +This are internally aliased to the corresponding legacy function of +class **afb_api**. + +```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 3 arguments: + * 1. 'closure' the user defined closure pointer 'callback_closure', + * 2. 'status' a status being 0 on success or negative when an error occured, + * 2. 'result' the resulting data as a JSON object. + * + * @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 callback The to call on completion + * @param callback_closure The closure to pass to the callback + * + * @see also 'afb_req_subcall' + */ +void afb_service_call( + const char *api, + const char *verb, + struct json_object *args, + void (*callback)(void*closure, int status, struct json_object *result), + void *callback_closure); + +/** + * Calls the 'verb' of the 'api' with the arguments 'args' and 'verb' in the name of the binding. + * 'result' will receive the response. + * + * 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 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 result Where to store the result - should call json_object_put on it - + * + * @returns 0 in case of success or a negative value in case of error. + * + * @see also 'afb_req_subcall' + */ +int afb_service_call_sync( + const char *api, + const char *verb, + struct json_object *args, + struct json_object **result); +```
\ No newline at end of file diff --git a/docs/reference-v3/macro-log.md b/docs/reference-v3/macro-log.md new file mode 100644 index 00000000..90d0be45 --- /dev/null +++ b/docs/reference-v3/macro-log.md @@ -0,0 +1,53 @@ +Macro for logging +================= + +The final behaviour of macros can be tuned using 2 defines that must be defined +before including **<afb/afb-binding.h>**. + +| define | action +|---------------------------------------|-------------------- +| AFB_BINDING_PRAGMA_NO_VERBOSE_DATA | show file and line, remove function and text message +| AFB_BINDING_PRAGMA_NO_VERBOSE_DETAILS | show text, remove function, line and file + +## Logging for an api + +The following macros must be used for logging for an **api** of type +**afb_api_t**. + +```C +AFB_API_ERROR(api,fmt,...) +AFB_API_WARNING(api,fmt,...) +AFB_API_NOTICE(api,fmt,...) +AFB_API_INFO(api,fmt,...) +AFB_API_DEBUG(api,fmt,...) +``` + +## Logging for a request + + +The following macros can be used for logging in the context +of a request **req** of type **afb_req_t**: + +```C +AFB_REQ_ERROR(req,fmt,...) +AFB_REQ_WARNING(req,fmt,...) +AFB_REQ_NOTICE(req,fmt,...) +AFB_REQ_INFO(req,fmt,...) +AFB_REQ_DEBUG(req,fmt,...) +``` + +By default, the logging macros add file, line and function +indication. + +## Logging legacy + +The following macros are provided for legacy. + +```C +AFB_ERROR(fmt,...) +AFB_WARNING(fmt,...) +AFB_NOTICE(fmt,...) +AFB_INFO(fmt,...) +AFB_DEBUG(fmt,...) +``` + diff --git a/docs/reference-v3/types-and-globals.md b/docs/reference-v3/types-and-globals.md new file mode 100644 index 00000000..dc50b97a --- /dev/null +++ b/docs/reference-v3/types-and-globals.md @@ -0,0 +1,243 @@ +# Types and globals + +## The global afbBindingRoot + +The global **afbBindingRoot** of type **afb_api_t** is always implicitely +defined for bindings of version 3 or upper. It records the root api of +the binding. + +When the binding has a defined **afbBindingExport**, the root api +**afbBindingRoot** is the **afb_pi_t** relative to the api created for +this static description. + +When the binding has no defined **afbBindingExport**, the root api is +a virtual api representing the shared object of the binding. In that case +the name of the api is the path of the shared object. Its use is restricted +but allows log messages. + +## The global afbBindingExport + +The global **afbBindingExport** is not mandatory. + +If **afbBindingExport** is defined and exported, it must be of the type +**const afb_binding_t** and must describe the *root* api of the binding. + +## The type afb_api_t + +Bindings now can declare more than one api. The counter part is that +a new handle is needed to manage apis. These handles are of the type +**afb_api_t**. + +It is defined as below. + +```C +typedef struct afb_api_x3 afb_api_t; +``` + +## The type afb_binding_t + +The main structure, of type **afb_binding_t**, for describing the binding +must be exported under the name **afbBindingExport**. + +This structure is defined as below. + +```C +typedef struct afb_binding_v3 afb_binding_t; +``` + +Where: + +```C +/** + * Description of the bindings of type version 3 + */ +struct afb_binding_v3 +{ + /** api name for the binding, can't be NULL */ + const char *api; + + /** textual specification of the binding, can be NULL */ + const char *specification; + + /** some info about the api, can be NULL */ + const char *info; + + /** array of descriptions of verbs terminated by a NULL name, can be NULL */ + const struct afb_verb_v3 *verbs; + + /** callback at load of the binding */ + int (*preinit)(struct afb_api_x3 *api); + + /** callback for starting the service */ + int (*init)(struct afb_api_x3 *api); + + /** callback for handling events */ + void (*onevent)(struct afb_api_x3 *api, const char *event, struct json_object *object); + + /** userdata for afb_api_x3 */ + void *userdata; + + /** space separated list of provided class(es) */ + const char *provide_class; + + /** space separated list of required class(es) */ + const char *require_class; + + /** space separated list of required API(es) */ + const char *require_api; + + /** avoids concurrent requests to verbs */ + unsigned noconcurrency: 1; +}; +``` + +## The type afb_verb_t + +Each verb is described with a structure of type **afb_verb_t** +defined below: + +```C +typedef struct afb_verb_v3 afb_verb_t; +``` + +```C +/** + * Description of one verb as provided for binding API version 3 + */ +struct afb_verb_v3 +{ + /** name of the verb, NULL only at end of the array */ + const char *verb; + + /** callback function implementing the verb */ + void (*callback)(afb_req_t_x2 *req); + + /** required authorization, can be NULL */ + const struct afb_auth *auth; + + /** some info about the verb, can be NULL */ + const char *info; + + /**< data for the verb callback */ + void *vcbdata; + + /** authorization and session requirements of the verb */ + uint16_t session; + + /** is the verb glob name */ + uint16_t glob: 1; +}; +``` + +The **session** flags is one of the constant defined below: + +| Name | Description +|:----------------------:|------------------------------------------------------ +| AFB_SESSION_NONE | no flag, synonym to 0 +| AFB_SESSION_LOA_0 | Requires the LOA to be 0 or more, synonym to 0 or AFB_SESSION_NONE +| AFB_SESSION_LOA_1 | Requires the LOA to be 1 or more +| AFB_SESSION_LOA_2 | Requires the LOA to be 2 or more +| AFB_SESSION_LOA_3 | Requires the LOA to be 3 or more +| AFB_SESSION_CHECK | Requires the token to be set and valid +| AFB_SESSION_REFRESH | Implies a token refresh +| AFB_SESSION_CLOSE | Implies closing the session after request processed + +The LOA (Level Of Assurance) is set, by binding api, using the function **afb_req_session_set_LOA**. + +The session can be closed, by binding api, using the function **afb_req_session_close**. + +## The types afb_auth_t and afb_auth_type_t + +The structure **afb_auth_t** is used within verb description to +set security requirements. +The interpretation of the structure depends on the value of the field **type**. + +```C +typedef struct afb_auth afb_auth_t; + +/** + * Definition of an authorization entry + */ +struct afb_auth +{ + /** type of entry @see afb_auth_type */ + enum afb_auth_type type; + + union { + /** text when @ref type == @ref afb_auth_Permission */ + const char *text; + + /** level of assurancy when @ref type == @ref afb_auth_LOA */ + unsigned loa; + + /** first child when @ref type in { @ref afb_auth_Or, @ref afb_auth_And, @ref afb_auth_Not } */ + const struct afb_auth *first; + }; + + /** second child when @ref type in { @ref afb_auth_Or, @ref afb_auth_And } */ + const struct afb_auth *next; +}; + +``` + +The possible values for **type** is defined here: + +```C +typedef enum afb_auth_type afb_auth_type_t; + +/** + * Enumeration for authority (Session/Token/Assurance) definitions. + * + * @see afb_auth + */ +enum afb_auth_type +{ + /** never authorized, no data */ + afb_auth_No = 0, + + /** authorized if token valid, no data */ + afb_auth_Token, + + /** authorized if LOA greater than data 'loa' */ + afb_auth_LOA, + + /** authorized if permission 'text' is granted */ + afb_auth_Permission, + + /** authorized if 'first' or 'next' is authorized */ + afb_auth_Or, + + /** authorized if 'first' and 'next' are authorized */ + afb_auth_And, + + /** authorized if 'first' is not authorized */ + afb_auth_Not, + + /** always authorized, no data */ + afb_auth_Yes +}; +``` + +Example: + +```C +static const afb_auth_t myauth[] = { + { .type = afb_auth_Permission, .text = "urn:AGL:permission:me:public:set" }, + { .type = afb_auth_Permission, .text = "urn:AGL:permission:me:public:get" }, + { .type = afb_auth_Or, .first = &myauth[1], .next = &myauth[0] } +}; +``` + + +## The type afb_req_subcall_flags_t + +This is an enumeration that defines bit's positions for setting behaviour +of subcalls. + +| flag | value | description +|----------------------------|-------|-------------- +| afb_req_subcall_catch_events | 1 | the calling API wants to receive the events from subscription +| afb_req_subcall_pass_events | 2 | the original request will receive the events from subscription +| afb_req_subcall_on_behalf | 4 | the calling API wants to use the credentials of the original request +| afb_req_subcall_api_session | 8 | the calling API wants to use its session instead of the one of the original request + |