-Binding Reference
-=================
+# Binding Reference
-Structure for declaring binding
--------------------------------
-### struct afb_binding_v2
-
-The main structure, of type **afb_binding_v2**, for describing the binding
-must be exported under the name **afbBindingV2**.
-
-This structure is defined as below.
-
-```C
-/*
- * Description of the bindings of type version 2
- */
-struct afb_binding_v2
-{
- const char *api; /* api name for the binding */
- const char *specification; /* textual openAPIv3 specification of the binding */
- const char *info; /* some info about the api, can be NULL */
- const struct afb_verb_v2 *verbs; /* array of descriptions of verbs terminated by a NULL name */
- int (*preinit)(); /* callback at load of the binding */
- int (*init)(); /* callback for starting the service */
- void (*onevent)(const char *event, struct json_object *object); /* callback for handling events */
- unsigned noconcurrency: 1; /* avoids concurrent requests to verbs */
-};
-```
-
-### struct afb_verb_v2
-
-Each verb is described with a structure of type **afb_verb_v2**
-defined below:
-
-```C
-/*
- * Description of one verb of the API provided by the binding
- * This enumeration is valid for bindings of type version 2
- */
-struct afb_verb_v2
-{
- const char *verb; /* name of the verb */
- void (*callback)(struct afb_req req); /* callback function implementing the verb */
- const struct afb_auth *auth; /* required authorization */
- const char *info; /* some info about the verb, can be NULL */
- uint32_t session; /* authorization and session requirements of the verb */
-};
-```
-
-The session flags is an or of the constant defined below:
-
- - 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 cloing the session
-
-The LOA is set binding by binding using the function **afb_req_session_set_LOA**.
-
-### struct afb_auth and enum afb_auth_type
-
-The structure **afb_auth** is used within verb description to
-set security requirements. The interpretation of the structure
-depends on the value of the field **type**.
-
-```C
-struct afb_auth
-{
- const enum afb_auth_type type;
- union {
- const char *text;
- const unsigned loa;
- const struct afb_auth *first;
- };
- const struct afb_auth *next;
-};
-```
-The possible values for **type** is defined here:
-
-```C
-/*
- * Enum for Session/Token/Assurance middleware.
- */
-enum afb_auth_type
-{
- afb_auth_No = 0, /** never authorized, no data */
- afb_auth_Token, /** authorized if token valid, no data */
- afb_auth_LOA, /** authorized if LOA greater than data 'loa' */
- afb_auth_Permission, /** authorized if permission 'text' is granted */
- afb_auth_Or, /** authorized if 'first' or 'next' is authorized */
- afb_auth_And, /** authorized if 'first' and 'next' are authorized */
- afb_auth_Not, /** authorized if 'first' is not authorized */
- afb_auth_Yes /** always authorized, no data */
-};
-```
-
-Example:
-
-```C
-static const struct afb_auth _afb_auths_v2_monitor[] = {
- { .type = afb_auth_Permission, .text = "urn:AGL:permission:monitor:public:set" },
- { .type = afb_auth_Permission, .text = "urn:AGL:permission:monitor:public:get" },
- { .type = afb_auth_Or, .first = &_afb_auths_v2_monitor[1], .next = &_afb_auths_v2_monitor[0] }
-};
-```
-
-Functions of class afb_daemon...
--------------------------
-
-The 3 following functions are linked to libsystemd.
-They allow use of **sd_event** features and access
-to **sd_bus** features.
-
-```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();
-```
-
-The 2 following functions are linked to event management.
-Broadcasting an event send it to any possible listener.
-
-```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.
- *
- * 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.
- *
- * See afb_event_is_valid to check if there is an error.
- */
-struct afb_event afb_daemon_make_event(const char *name);
-```
-
-The following function is used by logging macros and should normally
-not be used. Instead, you should use the macros
-**AFB\_ERROR**, **AFB\_WARNING**, **AFB\_NOTICE**,
-**AFB\_INFO**, **AFB\_DEBUG**
-
-```C
-/*
- * 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, ...);
-```
-
-The 2 following functions MUST be used to access data of the bindings.
-
-```C
-/*
- * Get the root directory file descriptor. This file descriptor can
- * be used with functions 'openat', 'fstatat', ...
- */
-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);
-```
-
-The following function is used to queue jobs.
-
-```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 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 re-executed 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)
-```
-
-The following function must be used when a binding depends on other
-bindings at its initialization.
-
-```C
-/*
- * Tells that it requires the API of "name" to exist
- * and if 'initialized' is not null to be initialized.
- * Returns 0 in case of success or -1 in case of error.
- */
-int afb_daemon_require_api(const char *name, int initialized)
-```
-
-Functions of class afb_service...
--------------------------
-
-The following functions allow services to call verbs of other
-bindings for themselves.
-
-```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);
-```
-
-Functions of class afb_event...
--------------------------
-
-This function checks whether the event is valid. It must be used
-when creating events.
-
-```C
-/*
- * Checks wether the 'event' is valid or not.
- *
- * Returns 0 if not valid or 1 if valid.
- */
-int afb_event_is_valid(struct afb_event event);
-```
-
-The two following functions are used to broadcast or push
-event with its data.
-
-```C
-/*
- * Broadcasts widely the '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.
- *
- * Returns the count of clients that received the event.
- */
-int afb_event_broadcast(struct afb_event event, struct json_object *object);
-
-/*
- * Pushes the '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.
- *
- * Returns the count of clients that received the event.
- */
-int afb_event_push(struct afb_event event, struct json_object *object);
-```
-
-The following function destiys the event.
-
-```C
-/*
- * Drops the data associated to the 'event'
- * After calling this function, the event
- * MUST NOT BE USED ANYMORE.
- */
-void afb_event_drop(struct afb_event event);
-```
-
-This function allows to retrieve the exact name of the event.
-
-```C
-/*
- * Gets the name associated to the 'event'.
- */
-const char *afb_event_name(struct afb_event event);
-```
-
-Functions of class afb_req...
--------------------------
-
-This function checks the validity of the **req**.
-
-```C
-/*
- * Checks wether the request 'req' is valid or not.
- *
- * Returns 0 if not valid or 1 if valid.
- */
-int afb_req_is_valid(struct afb_req req);
-```
-
-The following functions retrieves parameters of the request.
-
-```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.
- */
-struct afb_arg afb_req_get(struct afb_req req, const char *name);
-
-/*
- * 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
- */
-const char *afb_req_value(struct afb_req req, const char *name);
-
-/*
- * 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
- */
-const char *afb_req_path(struct afb_req req, const char *name);
-
-/*
- * Gets from the request 'req' the json object hashing the arguments.
- * The returned object must not be released using 'json_object_put'.
- */
-struct json_object *afb_req_json(struct afb_req req);
-```
-
-The following functions emit the reply to the request.
-
-```C
-/*
- * Sends a reply of kind success to the request 'req'.
- * The status of the reply is automatically set to "success".
- * Its send the object 'obj' (can be NULL) with an
- * informationnal 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.
- */
-void afb_req_success(struct afb_req req, struct json_object *obj, const char *info);
-
-/*
- * Same as 'afb_req_success' 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.
- */
-void afb_req_success_f(struct afb_req req, struct json_object *obj, const char *info, ...);
-
-/*
- * Same as 'afb_req_success_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.
- */
-void afb_req_success_v(struct afb_req req, struct json_object *obj, const char *info, va_list args);
-
-/*
- * Sends a reply of kind failure to the request 'req'.
- * The status of the reply is set to 'status' and an
- * informationnal comment 'info' (can also be NULL) can be added.
- *
- * Note that calling afb_req_fail("success", info) is equivalent
- * to call afb_req_success(NULL, info). Thus even if possible it
- * is strongly recommended to NEVER use "success" for status.
- */
-void afb_req_fail(struct afb_req req, const char *status, const char *info);
-
-/*
- * Same as 'afb_req_fail' but the 'info' is a formatting
- * string followed by arguments.
- */
-void afb_req_fail_f(struct afb_req req, const char *status, const char *info, ...);
-
-/*
- * Same as 'afb_req_fail_f' but the arguments to the format 'info'
- * are given as a variable argument list instance.
- */
-void afb_req_fail_v(struct afb_req req, const char *status, const char *info, va_list args);
-```
-
-The following functions handle the session data.
-
-```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.
- */
-void *afb_req_context_get(struct afb_req req);
-
-/*
- * 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.
- */
-void afb_req_context_set(struct afb_req req, void *context, void (*free_context)(void*));
-
-/*
- * Gets the pointer stored by the binding for the session of 'req'.
- * If the stored pointer is NULL, indicating that no pointer was
- * already stored, afb_req_context creates a new context by calling
- * the function 'create_context' and stores it with the freeing function
- * 'free_context'.
- */
-void *afb_req_context(struct afb_req req, void *(*create_context)(), void (*free_context)(void*));
-
-/*
- * 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)
- */
-void afb_req_context_clear(struct afb_req req);
-
-/*
- * Closes the session associated with 'req'
- * and delete all associated contexts.
- */
-void afb_req_session_close(struct afb_req req);
-
-/*
- * Sets the level of assurance of the session of 'req'
- * to 'level'. The effect of this function is subject of
- * security policies.
- * Returns 1 on success or 0 if failed.
- */
-int afb_req_session_set_LOA(struct afb_req req, unsigned level);
-```
-
-
-The 4 following functions must be used for asynchronous handling requests.
-
-```C
-/*
- * Adds one to the count of references of 'req'.
- * This function MUST be called by asynchronous implementations
- * of verbs if no reply was sent before returning.
- */
-void afb_req_addref(struct afb_req req);
-
-/*
- * Substracts one to the count of references of 'req'.
- * This function MUST be called by asynchronous implementations
- * of verbs after sending the asynchronous reply.
- */
-void afb_req_unref(struct afb_req req);
-
-/*
- * Stores 'req' on heap for asynchronous use.
- * Returns a handler to the stored 'req' or NULL on memory depletion.
- * The count of reference to 'req' is incremented on success
- * (see afb_req_addref).
- */
-struct afb_stored_req *afb_req_store(struct afb_req req);
-
-/*
- * Retrieves the afb_req stored at 'sreq'.
- * Returns the stored request.
- * The count of reference is UNCHANGED, thus, the
- * function 'afb_req_unref' should be called on the result
- * after that the asynchronous reply if sent.
- */
-struct afb_req afb_req_unstore(struct afb_stored_req *sreq);
-```
-
-The two following functions are used to associate client with events
-(subscription).
-
-```C
-/*
- * Establishes for the client link identified by 'req' a subscription
- * to the 'event'.
- * Returns 0 in case of successful subscription or -1 in case of error.
- */
-int afb_req_subscribe(struct afb_req req, struct afb_event event);
-
-/*
- * 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.
- */
-int afb_req_unsubscribe(struct afb_req req, struct afb_event event);
-```
-
-The following functions must be used to make request in the name of the
-client (with its permissions).
-
-```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'.
- * 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.
- */
-void afb_req_subcall(
- struct afb_req req,
- const char *api,
- const char *verb,
- struct json_object *args,
- void (*callback)(void *closure, int status, struct json_object *result),
- void *closure);
-
-/*
- * 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.
- */
-int afb_req_subcall_sync(
- struct afb_req req,
- const char *api,
- const char *verb,
- struct json_object *args,
- struct json_object **result);
-```
-
-The following function is used by logging macros and should normally
-not be used. Instead, you should use the macros
-**AFB_REQ_ERROR**, **AFB_REQ_WARNING**, **AFB_REQ_NOTICE**,
-**AFB_REQ_INFO**, **AFB_REQ_DEBUG**
-
-```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
- */
-void afb_req_verbose(struct afb_req req, int level, const char *file, int line, const char * func, const char *fmt, ...);
-```
-
-Logging macros
---------------
-
-The following macros must be used for logging:
-
-```C
-AFB_ERROR(fmt,...)
-AFB_WARNING(fmt,...)
-AFB_NOTICE(fmt,...)
-AFB_INFO(fmt,...)
-AFB_DEBUG(fmt,...)
-```
-
-The following macros can be used for logging in the context
-of a request **req** of type **afb_req**:
-
-```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.
+ * [Structures and types](reference-v3/types-and-globals.html)
+ * [Functions of api](reference-v3/func-api.html)
+ * [Functions of req](reference-v3/func-req.html)
+ * [Functions of event](reference-v3/func-event.html)
+ * [Functions of daemon](reference-v3/func-daemon.html)
+ * [Functions of service](reference-v3/func-service.html)
+ * [Macros for logging](reference-v3/macro-log.html)
Code Review / src / app-framework-binder.git / blobdiff