/*
- * Copyright (C) 2015, 2016 "IoT.bzh"
- * Author "Fulup Ar Foll"
+ * Copyright (C) 2015-2020 "IoT.bzh"
* Author José Bollo <jose.bollo@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
#include <string.h>
#include <assert.h>
#include <errno.h>
+#include <pthread.h>
#include <json-c/json.h>
-#include <afb/afb-event-itf.h>
+#include <afb/afb-event-x2-itf.h>
+#include <afb/afb-event-x1.h>
#include "afb-evt.h"
+#include "afb-hook.h"
+#include "verbose.h"
+#include "jobs.h"
+#include "uuid.h"
struct afb_evt_watch;
/* head of the list of events listened */
struct afb_evt_watch *watchs;
+ /* rwlock of the listener */
+ pthread_rwlock_t rwlock;
+
/* count of reference to the listener */
- int refcount;
+ uint16_t refcount;
};
/*
* Structure for describing events
*/
-struct afb_evt_event {
+struct afb_evtid {
+
+ /* interface */
+ struct afb_event_x2 eventid;
/* next event */
- struct afb_evt_event *next;
+ struct afb_evtid *next;
/* head of the list of listeners watching the event */
struct afb_evt_watch *watchs;
+ /* rwlock of the event */
+ pthread_rwlock_t rwlock;
+
+#if WITH_AFB_HOOK
+ /* hooking */
+ int hookflags;
+#endif
+
+ /* refcount */
+ uint16_t refcount;
+
/* id of the event */
- int id;
+ uint16_t id;
- /* name of the event */
- char name[1];
+ /* fullname of the event */
+ char fullname[];
};
/*
*/
struct afb_evt_watch {
- /* the event */
- struct afb_evt_event *event;
+ /* the evtid */
+ struct afb_evtid *evtid;
- /* link to the next listener for the same event */
- struct afb_evt_watch *next_by_event;
+ /* link to the next watcher for the same evtid */
+ struct afb_evt_watch *next_by_evtid;
/* the listener */
struct afb_evt_listener *listener;
- /* link to the next event for the same listener */
+ /* link to the next watcher for the same listener */
struct afb_evt_watch *next_by_listener;
+};
+
+/*
+ * structure for job of broadcasting events
+ */
+struct job_broadcast
+{
+ /** object atached to the event */
+ struct json_object *object;
+
+ /** the uuid of the event */
+ uuid_binary_t uuid;
- /* activity */
- unsigned activity;
+ /** remaining hop */
+ uint8_t hop;
+
+ /** name of the event to broadcast */
+ char event[];
+};
+
+/*
+ * structure for job of broadcasting or pushing events
+ */
+struct job_evtid
+{
+ /** the event to broadcast */
+ struct afb_evtid *evtid;
+
+ /** object atached to the event */
+ struct json_object *object;
};
-/* declare functions */
-static int evt_broadcast(struct afb_evt_event *evt, struct json_object *obj);
-static int evt_push(struct afb_evt_event *evt, struct json_object *obj);
-static void evt_destroy(struct afb_evt_event *evt);
+/* the interface for events */
+static struct afb_event_x2_itf afb_evt_event_x2_itf = {
+ .broadcast = (void*)afb_evt_evtid_broadcast,
+ .push = (void*)afb_evt_evtid_push,
+ .unref = (void*)afb_evt_evtid_unref,
+ .name = (void*)afb_evt_evtid_name,
+ .addref = (void*)afb_evt_evtid_addref
+};
+#if WITH_AFB_HOOK
/* the interface for events */
-static struct afb_event_itf afb_evt_event_itf = {
- .broadcast = (void*)evt_broadcast,
- .push = (void*)evt_push,
- .drop = (void*)evt_destroy
+static struct afb_event_x2_itf afb_evt_hooked_event_x2_itf = {
+ .broadcast = (void*)afb_evt_evtid_hooked_broadcast,
+ .push = (void*)afb_evt_evtid_hooked_push,
+ .unref = (void*)afb_evt_evtid_hooked_unref,
+ .name = (void*)afb_evt_evtid_hooked_name,
+ .addref = (void*)afb_evt_evtid_hooked_addref
};
+#endif
+
+/* job groups for events push/broadcast */
+#define BROADCAST_JOB_GROUP (&afb_evt_event_x2_itf)
+#define PUSH_JOB_GROUP (&afb_evt_event_x2_itf)
/* head of the list of listeners */
+static pthread_rwlock_t listeners_rwlock = PTHREAD_RWLOCK_INITIALIZER;
static struct afb_evt_listener *listeners = NULL;
/* handling id of events */
-static struct afb_evt_event *events = NULL;
-static int event_id_counter = 0;
-static int event_id_wrapped = 0;
+static pthread_rwlock_t events_rwlock = PTHREAD_RWLOCK_INITIALIZER;
+static struct afb_evtid *evtids = NULL;
+static uint16_t event_genid = 0;
+static uint16_t event_count = 0;
+
+/* head of uniqueness of events */
+#if !defined(EVENT_BROADCAST_HOP_MAX)
+# define EVENT_BROADCAST_HOP_MAX 10
+#endif
+#if !defined(EVENT_BROADCAST_MEMORY_COUNT)
+# define EVENT_BROADCAST_MEMORY_COUNT 8
+#endif
+
+#if EVENT_BROADCAST_MEMORY_COUNT
+static struct {
+ pthread_mutex_t mutex;
+ uint8_t base;
+ uint8_t count;
+ uuid_binary_t uuids[EVENT_BROADCAST_MEMORY_COUNT];
+} uniqueness = {
+ .mutex = PTHREAD_MUTEX_INITIALIZER,
+ .base = 0,
+ .count = 0
+};
+#endif
/*
- * Broadcasts the event 'evt' with its 'object'
- * 'object' is released (like json_object_put)
- * Returns the count of listener that received the event.
+ * Create structure for job of broadcasting string 'event' with 'object'
+ * Returns the created structure or NULL if out of memory
*/
-static int evt_broadcast(struct afb_evt_event *evt, struct json_object *object)
+static struct job_broadcast *make_job_broadcast(const char *event, struct json_object *object, const uuid_binary_t uuid, uint8_t hop)
{
- return afb_evt_broadcast(evt->name, object);
+ size_t sz = 1 + strlen(event);
+ struct job_broadcast *jb = malloc(sz + sizeof *jb);
+ if (jb) {
+ jb->object = object;
+ memcpy(jb->uuid, uuid, sizeof jb->uuid);
+ jb->hop = hop;
+ memcpy(jb->event, event, sz);
+ }
+ return jb;
}
/*
- * Broadcasts the 'event' with its 'object'
- * 'object' is released (like json_object_put)
- * Returns the count of listener having receive the event.
+ * Destroy structure 'jb' for job of broadcasting string events
*/
-int afb_evt_broadcast(const char *event, struct json_object *object)
+static void destroy_job_broadcast(struct job_broadcast *jb)
+{
+ json_object_put(jb->object);
+ free(jb);
+}
+
+/*
+ * Create structure for job of broadcasting or pushing 'evtid' with 'object'
+ * Returns the created structure or NULL if out of memory
+ */
+static struct job_evtid *make_job_evtid(struct afb_evtid *evtid, struct json_object *object)
+{
+ struct job_evtid *je = malloc(sizeof *je);
+ if (je) {
+ je->evtid = afb_evt_evtid_addref(evtid);
+ je->object = object;
+ }
+ return je;
+}
+
+/*
+ * Destroy structure for job of broadcasting or pushing evtid
+ */
+static void destroy_job_evtid(struct job_evtid *je)
+{
+ afb_evt_evtid_unref(je->evtid);
+ json_object_put(je->object);
+ free(je);
+}
+
+/*
+ * Broadcasts the 'event' of 'id' with its 'object'
+ */
+static void broadcast(struct job_broadcast *jb)
{
- int result;
struct afb_evt_listener *listener;
- result = 0;
+ pthread_rwlock_rdlock(&listeners_rwlock);
listener = listeners;
while(listener) {
- if (listener->itf->broadcast != NULL) {
- listener->itf->broadcast(listener->closure, event, 0, json_object_get(object));
- result++;
- }
+ if (listener->itf->broadcast != NULL)
+ listener->itf->broadcast(listener->closure, jb->event, json_object_get(jb->object), jb->uuid, jb->hop);
listener = listener->next;
}
+ pthread_rwlock_unlock(&listeners_rwlock);
+}
+
+/*
+ * Jobs callback for broadcasting string asynchronously
+ */
+static void broadcast_job(int signum, void *closure)
+{
+ struct job_broadcast *jb = closure;
+
+ if (signum == 0)
+ broadcast(jb);
+ destroy_job_broadcast(jb);
+}
+
+/*
+ * Broadcasts the string 'event' with its 'object'
+ */
+static int unhooked_broadcast(const char *event, struct json_object *object, const uuid_binary_t uuid, uint8_t hop)
+{
+ uuid_binary_t local_uuid;
+ struct job_broadcast *jb;
+ int rc;
+#if EVENT_BROADCAST_MEMORY_COUNT
+ int iter, count;
+#endif
+
+ /* check if lately sent */
+ if (!uuid) {
+ uuid_new_binary(local_uuid);
+ uuid = local_uuid;
+ hop = EVENT_BROADCAST_HOP_MAX;
+#if EVENT_BROADCAST_MEMORY_COUNT
+ pthread_mutex_lock(&uniqueness.mutex);
+ } else {
+ pthread_mutex_lock(&uniqueness.mutex);
+ iter = (int)uniqueness.base;
+ count = (int)uniqueness.count;
+ while (count) {
+ if (0 == memcmp(uuid, uniqueness.uuids[iter], sizeof(uuid_binary_t))) {
+ pthread_mutex_unlock(&uniqueness.mutex);
+ return 0;
+ }
+ if (++iter == EVENT_BROADCAST_MEMORY_COUNT)
+ iter = 0;
+ count--;
+ }
+ }
+ iter = (int)uniqueness.base;
+ if (uniqueness.count < EVENT_BROADCAST_MEMORY_COUNT)
+ iter += (int)(uniqueness.count++);
+ else if (++uniqueness.base == EVENT_BROADCAST_MEMORY_COUNT)
+ uniqueness.base = 0;
+ memcpy(uniqueness.uuids[iter], uuid, sizeof(uuid_binary_t));
+ pthread_mutex_unlock(&uniqueness.mutex);
+#else
+ }
+#endif
+
+ /* create the structure for the job */
+ jb = make_job_broadcast(event, object, uuid, hop);
+ if (jb == NULL) {
+ ERROR("Cant't create broadcast string job item for %s(%s)",
+ event, json_object_to_json_string(object));
+ json_object_put(object);
+ return -1;
+ }
+
+ /* queue the job */
+ rc = jobs_queue(BROADCAST_JOB_GROUP, 0, broadcast_job, jb);
+ if (rc) {
+ ERROR("cant't queue broadcast string job item for %s(%s)",
+ event, json_object_to_json_string(object));
+ destroy_job_broadcast(jb);
+ }
+ return rc;
+}
+
+/*
+ * Broadcasts the event 'evtid' with its 'object'
+ * 'object' is released (like json_object_put)
+ * Returns the count of listener that received the event.
+ */
+int afb_evt_evtid_broadcast(struct afb_evtid *evtid, struct json_object *object)
+{
+ return unhooked_broadcast(evtid->fullname, object, NULL, 0);
+}
+
+#if WITH_AFB_HOOK
+/*
+ * Broadcasts the event 'evtid' with its 'object'
+ * 'object' is released (like json_object_put)
+ * Returns the count of listener that received the event.
+ */
+int afb_evt_evtid_hooked_broadcast(struct afb_evtid *evtid, struct json_object *object)
+{
+ int result;
+
+ json_object_get(object);
+
+ if (evtid->hookflags & afb_hook_flag_evt_broadcast_before)
+ afb_hook_evt_broadcast_before(evtid->fullname, evtid->id, object);
+
+ result = afb_evt_evtid_broadcast(evtid, object);
+
+ if (evtid->hookflags & afb_hook_flag_evt_broadcast_after)
+ afb_hook_evt_broadcast_after(evtid->fullname, evtid->id, object, result);
+
json_object_put(object);
+
+ return result;
+}
+#endif
+
+int afb_evt_rebroadcast(const char *event, struct json_object *object, const uuid_binary_t uuid, uint8_t hop)
+{
+ int result;
+
+#if WITH_AFB_HOOK
+ json_object_get(object);
+ afb_hook_evt_broadcast_before(event, 0, object);
+#endif
+
+ result = unhooked_broadcast(event, object, uuid, hop);
+
+#if WITH_AFB_HOOK
+ afb_hook_evt_broadcast_after(event, 0, object, result);
+ json_object_put(object);
+#endif
return result;
}
/*
- * Broadcasts the event 'evt' with its 'object'
+ * Broadcasts the 'event' with its 'object'
* 'object' is released (like json_object_put)
- * Returns the count of listener taht received the event.
+ * Returns the count of listener having receive the event.
*/
-static int evt_push(struct afb_evt_event *evt, struct json_object *obj)
+int afb_evt_broadcast(const char *event, struct json_object *object)
+{
+ return afb_evt_rebroadcast(event, object, NULL, 0);
+}
+
+/*
+ * Pushes the event 'evtid' with 'obj' to its listeners
+ * Returns the count of listener that received the event.
+ */
+static void push_evtid(struct afb_evtid *evtid, struct json_object *object)
{
- int result;
struct afb_evt_watch *watch;
struct afb_evt_listener *listener;
- result = 0;
- watch = evt->watchs;
+ pthread_rwlock_rdlock(&evtid->rwlock);
+ watch = evtid->watchs;
while(watch) {
listener = watch->listener;
assert(listener->itf->push != NULL);
- if (watch->activity != 0)
- listener->itf->push(listener->closure, evt->name, evt->id, json_object_get(obj));
- watch = watch->next_by_event;
- result++;
+ listener->itf->push(listener->closure, evtid->fullname, evtid->id, json_object_get(object));
+ watch = watch->next_by_evtid;
}
- json_object_put(obj);
- return result;
+ pthread_rwlock_unlock(&evtid->rwlock);
+}
+
+/*
+ * Jobs callback for pushing evtid asynchronously
+ */
+static void push_job_evtid(int signum, void *closure)
+{
+ struct job_evtid *je = closure;
+
+ if (signum == 0)
+ push_evtid(je->evtid, je->object);
+ destroy_job_evtid(je);
}
/*
- * remove the 'watch'
+ * Pushes the event 'evtid' with 'obj' to its listeners
+ * 'obj' is released (like json_object_put)
+ * Returns 1 if at least one listener exists or 0 if no listener exists or
+ * -1 in case of error and the event can't be delivered
*/
-static void remove_watch(struct afb_evt_watch *watch)
+int afb_evt_evtid_push(struct afb_evtid *evtid, struct json_object *object)
+{
+ struct job_evtid *je;
+ int rc;
+
+ if (!evtid->watchs)
+ return 0;
+
+ je = make_job_evtid(evtid, object);
+ if (je == NULL) {
+ ERROR("Cant't create push evtid job item for %s(%s)",
+ evtid->fullname, json_object_to_json_string(object));
+ json_object_put(object);
+ return -1;
+ }
+
+ rc = jobs_queue(PUSH_JOB_GROUP, 0, push_job_evtid, je);
+ if (rc == 0)
+ rc = 1;
+ else {
+ ERROR("cant't queue push evtid job item for %s(%s)",
+ evtid->fullname, json_object_to_json_string(object));
+ destroy_job_evtid(je);
+ }
+
+ return rc;
+}
+
+#if WITH_AFB_HOOK
+/*
+ * Pushes the event 'evtid' with 'obj' to its listeners
+ * 'obj' is released (like json_object_put)
+ * Emits calls to hooks.
+ * Returns the count of listener taht received the event.
+ */
+int afb_evt_evtid_hooked_push(struct afb_evtid *evtid, struct json_object *obj)
+{
+
+ int result;
+
+ /* lease the object */
+ json_object_get(obj);
+
+ /* hook before push */
+ if (evtid->hookflags & afb_hook_flag_evt_push_before)
+ afb_hook_evt_push_before(evtid->fullname, evtid->id, obj);
+
+ /* push */
+ result = afb_evt_evtid_push(evtid, obj);
+
+ /* hook after push */
+ if (evtid->hookflags & afb_hook_flag_evt_push_after)
+ afb_hook_evt_push_after(evtid->fullname, evtid->id, obj, result);
+
+ /* release the object */
+ json_object_put(obj);
+ return result;
+}
+#endif
+
+static void unwatch(struct afb_evt_listener *listener, struct afb_evtid *evtid, int remove)
+{
+ /* notify listener if needed */
+ if (remove && listener->itf->remove != NULL)
+ listener->itf->remove(listener->closure, evtid->fullname, evtid->id);
+}
+
+static void evtid_unwatch(struct afb_evtid *evtid, struct afb_evt_listener *listener, struct afb_evt_watch *watch, int remove)
{
struct afb_evt_watch **prv;
- struct afb_evt_event *evt;
- struct afb_evt_listener *listener;
/* notify listener if needed */
- evt = watch->event;
- listener = watch->listener;
- if (watch->activity != 0 && listener->itf->remove != NULL)
- listener->itf->remove(listener->closure, evt->name, evt->id);
+ unwatch(listener, evtid, remove);
/* unlink the watch for its event */
- prv = &evt->watchs;
- while(*prv != watch)
- prv = &(*prv)->next_by_event;
- *prv = watch->next_by_event;
-
- /* unlink the watch for its listener */
+ pthread_rwlock_wrlock(&listener->rwlock);
prv = &listener->watchs;
- while(*prv != watch)
+ while(*prv) {
+ if (*prv == watch) {
+ *prv = watch->next_by_listener;
+ break;
+ }
prv = &(*prv)->next_by_listener;
- *prv = watch->next_by_listener;
+ }
+ pthread_rwlock_unlock(&listener->rwlock);
/* recycle memory */
free(watch);
}
-/*
- * Destroys the event 'evt'
- */
-static void evt_destroy(struct afb_evt_event *evt)
+static void listener_unwatch(struct afb_evt_listener *listener, struct afb_evtid *evtid, struct afb_evt_watch *watch, int remove)
{
- struct afb_evt_event **prv;
- if (evt != NULL) {
- /* removes the event if valid! */
- prv = &events;
- while (*prv != NULL) {
- if (*prv != evt)
- prv = &(*prv)->next;
- else {
- /* valid, unlink */
- *prv = evt->next;
+ struct afb_evt_watch **prv;
- /* removes all watchers */
- while(evt->watchs != NULL)
- remove_watch(evt->watchs);
+ /* notify listener if needed */
+ unwatch(listener, evtid, remove);
- /* free */
- free(evt);
- break;
- }
+ /* unlink the watch for its event */
+ pthread_rwlock_wrlock(&evtid->rwlock);
+ prv = &evtid->watchs;
+ while(*prv) {
+ if (*prv == watch) {
+ *prv = watch->next_by_evtid;
+ break;
}
+ prv = &(*prv)->next_by_evtid;
}
+ pthread_rwlock_unlock(&evtid->rwlock);
+
+ /* recycle memory */
+ free(watch);
}
/*
- * Creates an event of 'name' and returns it.
- * Returns an event with closure==NULL in case of error.
+ * Creates an event of name 'fullname' and returns it or NULL on error.
*/
-struct afb_event afb_evt_create_event(const char *name)
+struct afb_evtid *afb_evt_evtid_create(const char *fullname)
{
size_t len;
- struct afb_evt_event *evt;
-
- /* allocates the id */
- do {
- if (++event_id_counter < 0) {
- event_id_wrapped = 1;
- event_id_counter = 1024; /* heuristic: small numbers are not destroyed */
- }
- if (!event_id_wrapped)
- break;
- evt = events;
- while(evt != NULL && evt->id != event_id_counter)
- evt = evt->next;
- } while (evt != NULL);
+ struct afb_evtid *evtid, *oevt;
+ uint16_t id;
/* allocates the event */
- len = strlen(name);
- evt = malloc(len + sizeof * evt);
- if (evt == NULL)
+ len = strlen(fullname);
+ evtid = malloc(len + 1 + sizeof * evtid);
+ if (evtid == NULL)
goto error;
+ /* allocates the id */
+ pthread_rwlock_wrlock(&events_rwlock);
+ if (event_count == UINT16_MAX) {
+ pthread_rwlock_unlock(&events_rwlock);
+ free(evtid);
+ ERROR("Can't create more events");
+ return NULL;
+ }
+ event_count++;
+ do {
+ /* TODO add a guard (counting number of event created) */
+ id = ++event_genid;
+ if (!id)
+ id = event_genid = 1;
+ oevt = evtids;
+ while(oevt != NULL && oevt->id != id)
+ oevt = oevt->next;
+ } while (oevt != NULL);
+
/* initialize the event */
- evt->next = events;
- evt->watchs = NULL;
- evt->id = event_id_counter;
- assert(evt->id > 0);
- memcpy(evt->name, name, len + 1);
- events = evt;
+ memcpy(evtid->fullname, fullname, len + 1);
+ evtid->next = evtids;
+ evtid->refcount = 1;
+ evtid->watchs = NULL;
+ evtid->id = id;
+ pthread_rwlock_init(&evtid->rwlock, NULL);
+ evtids = evtid;
+#if WITH_AFB_HOOK
+ evtid->hookflags = afb_hook_flags_evt(evtid->fullname);
+ evtid->eventid.itf = evtid->hookflags ? &afb_evt_hooked_event_x2_itf : &afb_evt_event_x2_itf;
+ if (evtid->hookflags & afb_hook_flag_evt_create)
+ afb_hook_evt_create(evtid->fullname, evtid->id);
+#else
+ evtid->eventid.itf = &afb_evt_event_x2_itf;
+#endif
+ pthread_rwlock_unlock(&events_rwlock);
/* returns the event */
- return (struct afb_event){ .itf = &afb_evt_event_itf, .closure = evt };
+ return evtid;
error:
- return (struct afb_event){ .itf = NULL, .closure = NULL };
+ return NULL;
+}
+
+/*
+ * Creates an event of name 'prefix'/'name' and returns it or NULL on error.
+ */
+struct afb_evtid *afb_evt_evtid_create2(const char *prefix, const char *name)
+{
+ size_t prelen, postlen;
+ char *fullname;
+
+ /* makes the event fullname */
+ prelen = strlen(prefix);
+ postlen = strlen(name);
+ fullname = alloca(prelen + postlen + 2);
+ memcpy(fullname, prefix, prelen);
+ fullname[prelen] = '/';
+ memcpy(fullname + prelen + 1, name, postlen + 1);
+
+ /* create the event */
+ return afb_evt_evtid_create(fullname);
+}
+
+/*
+ * increment the reference count of the event 'evtid'
+ */
+struct afb_evtid *afb_evt_evtid_addref(struct afb_evtid *evtid)
+{
+ __atomic_add_fetch(&evtid->refcount, 1, __ATOMIC_RELAXED);
+ return evtid;
+}
+
+#if WITH_AFB_HOOK
+/*
+ * increment the reference count of the event 'evtid'
+ */
+struct afb_evtid *afb_evt_evtid_hooked_addref(struct afb_evtid *evtid)
+{
+ if (evtid->hookflags & afb_hook_flag_evt_addref)
+ afb_hook_evt_addref(evtid->fullname, evtid->id);
+ return afb_evt_evtid_addref(evtid);
+}
+#endif
+
+/*
+ * decrement the reference count of the event 'evtid'
+ * and destroy it when the count reachs zero
+ */
+void afb_evt_evtid_unref(struct afb_evtid *evtid)
+{
+ struct afb_evtid **prv, *oev;
+ struct afb_evt_watch *watch, *nwatch;
+
+ if (!__atomic_sub_fetch(&evtid->refcount, 1, __ATOMIC_RELAXED)) {
+ /* unlinks the event if valid! */
+ pthread_rwlock_wrlock(&events_rwlock);
+ prv = &evtids;
+ for(;;) {
+ oev = *prv;
+ if (oev == evtid)
+ break;
+ if (!oev) {
+ ERROR("unexpected event");
+ pthread_rwlock_unlock(&events_rwlock);
+ return;
+ }
+ prv = &oev->next;
+ }
+ event_count--;
+ *prv = evtid->next;
+ pthread_rwlock_unlock(&events_rwlock);
+
+ /* removes all watchers */
+ pthread_rwlock_wrlock(&evtid->rwlock);
+ watch = evtid->watchs;
+ evtid->watchs = NULL;
+ pthread_rwlock_unlock(&evtid->rwlock);
+ while(watch) {
+ nwatch = watch->next_by_evtid;
+ evtid_unwatch(evtid, watch->listener, watch, 1);
+ watch = nwatch;
+ }
+
+ /* free */
+ pthread_rwlock_destroy(&evtid->rwlock);
+ free(evtid);
+ }
+}
+
+#if WITH_AFB_HOOK
+/*
+ * decrement the reference count of the event 'evtid'
+ * and destroy it when the count reachs zero
+ */
+void afb_evt_evtid_hooked_unref(struct afb_evtid *evtid)
+{
+ if (evtid->hookflags & afb_hook_flag_evt_unref)
+ afb_hook_evt_unref(evtid->fullname, evtid->id);
+ afb_evt_evtid_unref(evtid);
+}
+#endif
+
+/*
+ * Returns the true name of the 'event'
+ */
+const char *afb_evt_evtid_fullname(struct afb_evtid *evtid)
+{
+ return evtid->fullname;
}
/*
* Returns the name of the 'event'
*/
-const char *afb_evt_event_name(struct afb_event event)
+const char *afb_evt_evtid_name(struct afb_evtid *evtid)
{
- return (event.itf != &afb_evt_event_itf) ? NULL : ((struct afb_evt_event *)event.closure)->name;
+ const char *name = strchr(evtid->fullname, '/');
+ return name ? name + 1 : evtid->fullname;
}
+#if WITH_AFB_HOOK
+/*
+ * Returns the name associated to the event 'evtid'.
+ */
+const char *afb_evt_evtid_hooked_name(struct afb_evtid *evtid)
+{
+ const char *result = afb_evt_evtid_name(evtid);
+ if (evtid->hookflags & afb_hook_flag_evt_name)
+ afb_hook_evt_name(evtid->fullname, evtid->id, result);
+ return result;
+}
+#endif
+
/*
* Returns the id of the 'event'
*/
-int afb_evt_event_id(struct afb_event event)
+uint16_t afb_evt_evtid_id(struct afb_evtid *evtid)
{
- return (event.itf != &afb_evt_event_itf) ? 0 : ((struct afb_evt_event *)event.closure)->id;
+ return evtid->id;
}
/*
struct afb_evt_listener *listener;
/* search if an instance already exists */
+ pthread_rwlock_wrlock(&listeners_rwlock);
listener = listeners;
while (listener != NULL) {
- if (listener->itf == itf && listener->closure == closure)
- return afb_evt_listener_addref(listener);
+ if (listener->itf == itf && listener->closure == closure) {
+ listener = afb_evt_listener_addref(listener);
+ goto found;
+ }
listener = listener->next;
}
listener = calloc(1, sizeof *listener);
if (listener != NULL) {
/* init */
- listener->next = listeners;
listener->itf = itf;
listener->closure = closure;
listener->watchs = NULL;
listener->refcount = 1;
+ pthread_rwlock_init(&listener->rwlock, NULL);
+ listener->next = listeners;
listeners = listener;
}
+ found:
+ pthread_rwlock_unlock(&listeners_rwlock);
return listener;
}
*/
struct afb_evt_listener *afb_evt_listener_addref(struct afb_evt_listener *listener)
{
- listener->refcount++;
+ __atomic_add_fetch(&listener->refcount, 1, __ATOMIC_RELAXED);
return listener;
}
*/
void afb_evt_listener_unref(struct afb_evt_listener *listener)
{
- if (0 == --listener->refcount) {
- struct afb_evt_listener **prv;
+ struct afb_evt_listener **prv, *olis;
- /* remove the watchers */
- while (listener->watchs != NULL)
- remove_watch(listener->watchs);
+ if (listener && !__atomic_sub_fetch(&listener->refcount, 1, __ATOMIC_RELAXED)) {
/* unlink the listener */
+ pthread_rwlock_wrlock(&listeners_rwlock);
prv = &listeners;
- while (*prv != listener)
- prv = &(*prv)->next;
+ for(;;) {
+ olis = *prv;
+ if (olis == listener)
+ break;
+ if (!olis) {
+ ERROR("unexpected listener");
+ pthread_rwlock_unlock(&listeners_rwlock);
+ return;
+ }
+ prv = &olis->next;
+ }
*prv = listener->next;
+ pthread_rwlock_unlock(&listeners_rwlock);
+
+ /* remove the watchers */
+ afb_evt_listener_unwatch_all(listener, 0);
/* free the listener */
+ pthread_rwlock_destroy(&listener->rwlock);
free(listener);
}
}
/*
- * Makes the 'listener' watching 'event'
+ * Makes the 'listener' watching 'evtid'
* Returns 0 in case of success or else -1.
*/
-int afb_evt_add_watch(struct afb_evt_listener *listener, struct afb_event event)
+int afb_evt_listener_watch_evt(struct afb_evt_listener *listener, struct afb_evtid *evtid)
{
struct afb_evt_watch *watch;
- struct afb_evt_event *evt;
/* check parameter */
- if (event.itf != &afb_evt_event_itf || listener->itf->push == NULL) {
+ if (listener->itf->push == NULL) {
errno = EINVAL;
return -1;
}
/* search the existing watch for the listener */
- evt = event.closure;
+ pthread_rwlock_wrlock(&listener->rwlock);
watch = listener->watchs;
while(watch != NULL) {
- if (watch->event == evt)
- goto found;
+ if (watch->evtid == evtid)
+ goto end;
watch = watch->next_by_listener;
}
/* not found, allocate a new */
watch = malloc(sizeof *watch);
if (watch == NULL) {
+ pthread_rwlock_unlock(&listener->rwlock);
errno = ENOMEM;
return -1;
}
/* initialise and link */
- watch->event = evt;
- watch->next_by_event = evt->watchs;
+ watch->evtid = evtid;
watch->listener = listener;
watch->next_by_listener = listener->watchs;
- watch->activity = 0;
- evt->watchs = watch;
listener->watchs = watch;
+ pthread_rwlock_wrlock(&evtid->rwlock);
+ watch->next_by_evtid = evtid->watchs;
+ evtid->watchs = watch;
+ pthread_rwlock_unlock(&evtid->rwlock);
+
+ if (listener->itf->add != NULL)
+ listener->itf->add(listener->closure, evtid->fullname, evtid->id);
+end:
+ pthread_rwlock_unlock(&listener->rwlock);
+ return 0;
+}
-found:
- if (watch->activity == 0 && listener->itf->add != NULL)
- listener->itf->add(listener->closure, evt->name, evt->id);
- watch->activity++;
+/*
+ * Avoids the 'listener' to watch 'evtid'
+ * Returns 0 in case of success or else -1.
+ */
+int afb_evt_listener_unwatch_evt(struct afb_evt_listener *listener, struct afb_evtid *evtid)
+{
+ struct afb_evt_watch *watch, **pwatch;
- return 0;
+ /* search the existing watch */
+ pthread_rwlock_wrlock(&listener->rwlock);
+ pwatch = &listener->watchs;
+ for (;;) {
+ watch = *pwatch;
+ if (!watch) {
+ pthread_rwlock_unlock(&listener->rwlock);
+ errno = ENOENT;
+ return -1;
+ }
+ if (evtid == watch->evtid) {
+ *pwatch = watch->next_by_listener;
+ pthread_rwlock_unlock(&listener->rwlock);
+ listener_unwatch(listener, evtid, watch, 1);
+ return 0;
+ }
+ pwatch = &watch->next_by_listener;
+ }
}
/*
- * Avoids the 'listener' to watch 'event'
+ * Avoids the 'listener' to watch 'eventid'
* Returns 0 in case of success or else -1.
*/
-int afb_evt_remove_watch(struct afb_evt_listener *listener, struct afb_event event)
+int afb_evt_listener_unwatch_id(struct afb_evt_listener *listener, uint16_t eventid)
{
- struct afb_evt_watch *watch;
- struct afb_evt_event *evt;
+ struct afb_evt_watch *watch, **pwatch;
+ struct afb_evtid *evtid;
+
+ /* search the existing watch */
+ pthread_rwlock_wrlock(&listener->rwlock);
+ pwatch = &listener->watchs;
+ for (;;) {
+ watch = *pwatch;
+ if (!watch) {
+ pthread_rwlock_unlock(&listener->rwlock);
+ errno = ENOENT;
+ return -1;
+ }
+ evtid = watch->evtid;
+ if (evtid->id == eventid) {
+ *pwatch = watch->next_by_listener;
+ pthread_rwlock_unlock(&listener->rwlock);
+ listener_unwatch(listener, evtid, watch, 1);
+ return 0;
+ }
+ pwatch = &watch->next_by_listener;
+ }
+}
+
+/*
+ * Avoids the 'listener' to watch any event, calling the callback
+ * 'remove' of the interface if 'remoe' is not zero.
+ */
+void afb_evt_listener_unwatch_all(struct afb_evt_listener *listener, int remove)
+{
+ struct afb_evt_watch *watch, *nwatch;
+
+ /* search the existing watch */
+ pthread_rwlock_wrlock(&listener->rwlock);
+ watch = listener->watchs;
+ listener->watchs = NULL;
+ pthread_rwlock_unlock(&listener->rwlock);
+ while(watch) {
+ nwatch = watch->next_by_listener;
+ listener_unwatch(listener, watch->evtid, watch, remove);
+ watch = nwatch;
+ }
+}
+
+#if WITH_AFB_HOOK
+/*
+ * update the hooks for events
+ */
+void afb_evt_update_hooks()
+{
+ struct afb_evtid *evtid;
+
+ pthread_rwlock_rdlock(&events_rwlock);
+ for (evtid = evtids ; evtid ; evtid = evtid->next) {
+ evtid->hookflags = afb_hook_flags_evt(evtid->fullname);
+ evtid->eventid.itf = evtid->hookflags ? &afb_evt_hooked_event_x2_itf : &afb_evt_event_x2_itf;
+ }
+ pthread_rwlock_unlock(&events_rwlock);
+}
+#endif
+
+inline struct afb_evtid *afb_evt_event_x2_to_evtid(struct afb_event_x2 *eventid)
+{
+ return (struct afb_evtid*)eventid;
+}
+
+inline struct afb_event_x2 *afb_evt_event_x2_from_evtid(struct afb_evtid *evtid)
+{
+ return &evtid->eventid;
+}
+
+/*
+ * Creates an event of 'fullname' and returns it.
+ * Returns an event with closure==NULL in case of error.
+ */
+struct afb_event_x2 *afb_evt_event_x2_create(const char *fullname)
+{
+ return afb_evt_event_x2_from_evtid(afb_evt_evtid_create(fullname));
+}
+
+/*
+ * Creates an event of name 'prefix'/'name' and returns it.
+ * Returns an event with closure==NULL in case of error.
+ */
+struct afb_event_x2 *afb_evt_event_x2_create2(const char *prefix, const char *name)
+{
+ return afb_evt_event_x2_from_evtid(afb_evt_evtid_create2(prefix, name));
+}
+
+/*
+ * Returns the fullname of the 'eventid'
+ */
+const char *afb_evt_event_x2_fullname(struct afb_event_x2 *eventid)
+{
+ struct afb_evtid *evtid = afb_evt_event_x2_to_evtid(eventid);
+ return evtid ? evtid->fullname : NULL;
+}
+
+/*
+ * Returns the id of the 'eventid'
+ */
+uint16_t afb_evt_event_x2_id(struct afb_event_x2 *eventid)
+{
+ struct afb_evtid *evtid = afb_evt_event_x2_to_evtid(eventid);
+ return evtid ? evtid->id : 0;
+}
+
+/*
+ * Makes the 'listener' watching 'eventid'
+ * Returns 0 in case of success or else -1.
+ */
+int afb_evt_listener_watch_x2(struct afb_evt_listener *listener, struct afb_event_x2 *eventid)
+{
+ struct afb_evtid *evtid = afb_evt_event_x2_to_evtid(eventid);
/* check parameter */
- if (event.itf != &afb_evt_event_itf) {
+ if (!evtid) {
errno = EINVAL;
return -1;
}
- /* search the existing watch */
- evt = event.closure;
- watch = listener->watchs;
- while(watch != NULL) {
- if (watch->event == evt) {
- /* found: remove it */
- if (watch->activity != 0) {
- watch->activity--;
- if (watch->activity == 0 && listener->itf->remove != NULL)
- listener->itf->remove(listener->closure, evt->name, evt->id);
- }
- return 0;
- }
- watch = watch->next_by_listener;
+ /* search the existing watch for the listener */
+ return afb_evt_listener_watch_evt(listener, evtid);
+}
+
+/*
+ * Avoids the 'listener' to watch 'eventid'
+ * Returns 0 in case of success or else -1.
+ */
+int afb_evt_listener_unwatch_x2(struct afb_evt_listener *listener, struct afb_event_x2 *eventid)
+{
+ struct afb_evtid *evtid = afb_evt_event_x2_to_evtid(eventid);
+
+ /* check parameter */
+ if (!evtid) {
+ errno = EINVAL;
+ return -1;
}
- errno = ENOENT;
- return -1;
+
+ /* search the existing watch */
+ return afb_evt_listener_unwatch_evt(listener, evtid);
+}
+
+int afb_evt_event_x2_push(struct afb_event_x2 *eventid, struct json_object *object)
+#if WITH_AFB_HOOK
+{
+ struct afb_evtid *evtid = afb_evt_event_x2_to_evtid(eventid);
+ if (evtid)
+ return afb_evt_evtid_hooked_push(evtid, object);
+ json_object_put(object);
+ return 0;
+}
+#else
+ __attribute__((alias("afb_evt_event_x2_unhooked_push")));
+#endif
+
+int afb_evt_event_x2_unhooked_push(struct afb_event_x2 *eventid, struct json_object *object)
+{
+ struct afb_evtid *evtid = afb_evt_event_x2_to_evtid(eventid);
+ if (evtid)
+ return afb_evt_evtid_push(evtid, object);
+ json_object_put(object);
+ return 0;
+}
+
+#if WITH_LEGACY_BINDING_V1 || WITH_LEGACY_BINDING_V2
+struct afb_event_x1 afb_evt_event_from_evtid(struct afb_evtid *evtid)
+{
+ return evtid
+#if WITH_AFB_HOOK
+ ? (struct afb_event_x1){ .itf = &afb_evt_hooked_event_x2_itf, .closure = &evtid->eventid }
+#else
+ ? (struct afb_event_x1){ .itf = &afb_evt_event_x2_itf, .closure = &evtid->eventid }
+#endif
+ : (struct afb_event_x1){ .itf = NULL, .closure = NULL };
+}
+#endif
+
+void afb_evt_event_x2_unref(struct afb_event_x2 *eventid)
+{
+ struct afb_evtid *evtid = afb_evt_event_x2_to_evtid(eventid);
+ if (evtid)
+ afb_evt_evtid_unref(evtid);
+}
+
+struct afb_event_x2 *afb_evt_event_x2_addref(struct afb_event_x2 *eventid)
+{
+ struct afb_evtid *evtid = afb_evt_event_x2_to_evtid(eventid);
+ if (evtid)
+ afb_evt_evtid_addref(evtid);
+ return eventid;
}
Code Review / src / app-framework-binder.git / blobdiff