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diff --git a/docs/3_Developer_Guides/2_Application_Framework_Binder/3_Binder_References.md b/docs/3_Developer_Guides/2_Application_Framework_Binder/3_Binder_References.md deleted file mode 100644 index fab571b..0000000 --- a/docs/3_Developer_Guides/2_Application_Framework_Binder/3_Binder_References.md +++ /dev/null @@ -1,2524 +0,0 @@ ---- -title: Binder References ---- - -i. TYPES AND GLOBALS -====================== - -## The global afbBindingRoot - -The global **afbBindingRoot** of type **afb_api_t** is always implicitly -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 or equal to 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 - -ii. MACROS 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,...) -``` - -iii. 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 requests 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 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); -``` - -### afb_api_settings - -```C -/** - * Settings of the api. - * - * Get the settings of the API. The settings are recorded - * as a JSON object. The returned object should not be modified. - * It MUST NOT be released using json_object_put. - * - * @param api the api whose settings are required - * - * @returns The setting object. - */ -struct json_object *afb_api_settings( - struct afb_api_x3 *api); -``` - -## Calls and job functions - -### afb_api_call - -```C -/** - * Calls the 'verb' of the 'apiname' with the arguments 'args' and 'verb' in the name of the binding 'api'. - * 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 - * - * 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 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 'apiname' with the arguments 'args' and 'verb' in the name of the binding 'api'. - * '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 0 in case of success or -1 in case of error - */ -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 preinit - * - * @return the created api in case of success or NULL on error - * - * @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 'apiname' 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 'apiname' 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); -``` - -iv. 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); -``` - -v. FUNCTIONS OF CLASS **afb_event** -============================== - -## 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 0 in case of success or -1 in case of error - */ -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 - * * 1 if at least one client listen for the event - * * 0 if no more client listen for the event - * * -1 in case of error (the event can't be delivered) - */ -int afb_event_push( - afb_event_t event, - struct json_object *object); -``` - -vi. 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); -``` - -vii. FUNCTIONS OF CLASS **afb_service** -============================== - -All the functions of the class **afb_service** use the default api. - -All these function are deprecated, try to use functions of class **afb_api** instead. - -## afb_service_call - -```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 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 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_service_call( - const char *api, - 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_service_call_sync - -```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 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_service_call_sync( - const char *api, - const char *verb, - struct json_object *args, - struct json_object **object, - char **error, - char **info); -``` - -## afb_service_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 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_service_call_legacy( - const char *api, - const char *verb, - struct json_object *args, - void (*callback)( - void *closure, - int status, - struct json_object *result, - afb_api_t api), - void *closure); -``` - -## afb_service_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 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_service_call_sync_legacy( - const char *api, - const char *verb, - struct json_object *args, - struct json_object **result); -```
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