#pragma once
+#if !defined(_GNU_SOURCE)
+# error "_GNU_SOURCE must be defined for using vasprintf"
+#endif
+
+#include <stdlib.h>
+#include <stdarg.h>
+#include <stdio.h>
+
+#include <afb/afb-event-itf.h>
+
+/* avoid inclusion of <json-c/json.h> */
struct json_object;
+/*
+ * Describes an argument (or parameter) of a request
+ */
struct afb_arg {
- const char *name;
- const char *value;
- const char *path;
+ const char *name; /* name of the argument or NULL if invalid */
+ const char *value; /* string representation of the value of the argument */
+ /* original filename of the argument if path != NULL */
+ const char *path; /* if not NULL, path of the received file for the argument */
+ /* when the request is finalized this file is removed */
};
+/*
+ * Interface for handling requests.
+ * It records the functions to be called for the request.
+ * Don't use this structure directly.
+ * Use the helper functions documented below.
+ */
struct afb_req_itf {
+ /* CAUTION: respect the order, add at the end */
+
struct json_object *(*json)(void *closure);
struct afb_arg (*get)(void *closure, const char *name);
void (*addref)(void *closure);
void (*unref)(void *closure);
+
+ void (*session_close)(void *closure);
+ int (*session_set_LOA)(void *closure, unsigned level);
+
+ int (*subscribe)(void *closure, struct afb_event event);
+ int (*unsubscribe)(void *closure, struct afb_event event);
};
+/*
+ * Describes the request by plugins from afb-daemon
+ */
struct afb_req {
- const struct afb_req_itf *itf;
- void *closure;
+ const struct afb_req_itf *itf; /* the interface to use */
+ void *closure; /* the closure argument for functions of 'itf' */
};
+/*
+ * 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.
+ */
static inline struct afb_arg afb_req_get(struct afb_req req, const char *name)
{
return req.itf->get(req.closure, 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
+ */
static inline const char *afb_req_value(struct afb_req req, const char *name)
{
return afb_req_get(req, name).value;
}
+/*
+ * 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
+ */
static inline const char *afb_req_path(struct afb_req req, const char *name)
{
return afb_req_get(req, name).path;
}
+/*
+ * Gets from the request 'req' the json object hashing the arguments.
+ * The returned object must not be released using 'json_object_put'.
+ */
static inline struct json_object *afb_req_json(struct afb_req req)
{
return req.itf->json(req.closure);
}
+/*
+ * 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 conveniency, 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.
+ */
static inline void afb_req_success(struct afb_req req, struct json_object *obj, const char *info)
{
req.itf->success(req.closure, obj, info);
}
-static inline void afb_req_fail(struct afb_req req, const char *status, const char *info)
+/*
+ * Same as 'afb_req_success' but the 'info' is a formatting
+ * string followed by arguments.
+ *
+ * For conveniency, 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.
+ */
+static inline void afb_req_success_f(struct afb_req req, struct json_object *obj, const char *info, ...)
{
- req.itf->fail(req.closure, status, info);
+ char *message;
+ va_list args;
+ va_start(args, info);
+ if (info == NULL || vasprintf(&message, info, args) < 0)
+ message = NULL;
+ va_end(args);
+ afb_req_success(req, obj, message);
+ free(message);
}
-static inline const char *afb_req_raw(struct afb_req req, size_t *size)
+/*
+ * 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 recommanded to NEVER use "success" for status.
+ *
+ * For conveniency, 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.
+ */
+static inline void afb_req_fail(struct afb_req req, const char *status, const char *info)
{
- return req.itf->raw(req.closure, size);
+ req.itf->fail(req.closure, status, info);
}
-static inline void afb_req_send(struct afb_req req, const char *buffer, size_t size)
+/*
+ * Same as 'afb_req_fail' but the 'info' is a formatting
+ * string followed by arguments.
+ *
+ * For conveniency, 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.
+ */
+static inline void afb_req_fail_f(struct afb_req req, const char *status, const char *info, ...)
{
- req.itf->send(req.closure, buffer, size);
+ char *message;
+ va_list args;
+ va_start(args, info);
+ if (info == NULL || vasprintf(&message, info, args) < 0)
+ message = NULL;
+ va_end(args);
+ afb_req_fail(req, status, message);
+ free(message);
}
+/*
+ * Gets the pointer stored by the plugin for the session of 'req'.
+ * When the plugin has not yet recorded a pointer, NULL is returned.
+ */
static inline void *afb_req_context_get(struct afb_req req)
{
return req.itf->context_get(req.closure);
}
-static inline void afb_req_context_set(struct afb_req req, void *value, void (*free_value)(void*))
+/*
+ * Stores for the plugin the pointer 'context' to the session of 'req'.
+ * The function 'free_context' will be called when the session is closed
+ * or if plugin stores an other pointer.
+ */
+static inline void afb_req_context_set(struct afb_req req, void *context, void (*free_context)(void*))
{
- return req.itf->context_set(req.closure, value, free_value);
+ req.itf->context_set(req.closure, context, free_context);
}
-static inline void *afb_req_context(struct afb_req req, void *(*create_value)(), void (*free_value)(void*))
+/*
+ * Gets the pointer stored by the plugin 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'.
+ */
+static inline void *afb_req_context(struct afb_req req, void *(*create_context)(), void (*free_context)(void*))
{
- void *result = req.itf->context_get(req.closure);
+ void *result = afb_req_context_get(req);
if (result == NULL) {
- result = create_value();
- if (result != NULL)
- req.itf->context_set(req.closure, result, free_value);
+ result = create_context();
+ afb_req_context_set(req, result, free_context);
}
return result;
}
+/*
+ * Frees the pointer stored by the plugin for the session of 'req'
+ * and sets it to NULL.
+ *
+ * Shortcut for: afb_req_context_set(req, NULL, NULL)
+ */
static inline void afb_req_context_clear(struct afb_req req)
{
afb_req_context_set(req, NULL, NULL);
}
+/*
+ * 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.
+ */
static inline void afb_req_addref(struct afb_req req)
{
- return req.itf->addref(req.closure);
+ req.itf->addref(req.closure);
}
+/*
+ * Substracts one to the count of references of 'req'.
+ * This function MUST be called by asynchronous implementations
+ * of verbs after sending the asynchronous reply.
+ */
static inline void afb_req_unref(struct afb_req req)
{
- return req.itf->unref(req.closure);
+ req.itf->unref(req.closure);
}
-#include <stdlib.h>
+/*
+ * Closes the session associated with 'req'
+ * and delete all associated contexts.
+ */
+static inline void afb_req_session_close(struct afb_req req)
+{
+ req.itf->session_close(req.closure);
+}
+
+/*
+ * 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.
+ */
+static inline int afb_req_session_set_LOA(struct afb_req req, unsigned level)
+{
+ return req.itf->session_set_LOA(req.closure, level);
+}
+/*
+ * Stores 'req' on heap for asynchrnous use.
+ * Returns a pointer to the stored 'req' or NULL on memory depletion.
+ * The count of reference to 'req' is incremented on success
+ * (see afb_req_addref).
+ */
static inline struct afb_req *afb_req_store(struct afb_req req)
{
struct afb_req *result = malloc(sizeof *result);
return result;
}
+/*
+ * Retrieves the afb_req stored at 'req' and frees the memory.
+ * Returns the stored request.
+ * The count of reference is UNCHANGED, thus, normally, the
+ * function 'afb_req_unref' should be called on the result
+ * after that the asynchronous reply if sent.
+ */
static inline struct afb_req afb_req_unstore(struct afb_req *req)
{
struct afb_req result = *req;
free(req);
- afb_req_unref(result);
return result;
}
-#if !defined(_GNU_SOURCE)
-# error "_GNU_SOURCE must be defined for using vasprintf"
-#endif
-
-#include <stdarg.h>
-#include <stdio.h>
-
-static inline void afb_req_fail_v(struct afb_req req, const char *status, const char *info, va_list args)
+/*
+ * 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.
+ */
+static inline int afb_req_subscribe(struct afb_req req, struct afb_event event)
{
- char *message;
- if (info == NULL || vasprintf(&message, info, args) < 0)
- message = NULL;
- afb_req_fail(req, status, message);
- free(message);
+ return req.itf->subscribe(req.closure, event);
}
-static inline void afb_req_fail_f(struct afb_req req, const char *status, const char *info, ...)
+/*
+ * 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.
+ */
+static inline int afb_req_unsubscribe(struct afb_req req, struct afb_event event)
{
- va_list args;
- va_start(args, info);
- afb_req_fail_v(req, status, info, args);
- va_end(args);
+ return req.itf->unsubscribe(req.closure, event);
}
-static inline void afb_req_success_v(struct afb_req req, struct json_object *obj, const char *info, va_list args)
+
+
+
+/* internal use */
+static inline const char *afb_req_raw(struct afb_req req, size_t *size)
{
- char *message;
- if (info == NULL || vasprintf(&message, info, args) < 0)
- message = NULL;
- afb_req_success(req, obj, message);
- free(message);
+ return req.itf->raw(req.closure, size);
}
-static inline void afb_req_success_f(struct afb_req req, struct json_object *obj, const char *info, ...)
+/* internal use */
+static inline void afb_req_send(struct afb_req req, const char *buffer, size_t size)
{
- va_list args;
- va_start(args, info);
- afb_req_success_v(req, obj, info, args);
- va_end(args);
+ req.itf->send(req.closure, buffer, size);
}
Code Review / src / app-framework-binder.git / blobdiff