[WIP] Moar filtering, cond variables with timeout

Still isn't _too_ tested, hmph.

src/Filter.c

@@ -32,42 +32,95 @@
 
 #include <Schema/Filter.h>
 
+/* Verifies whenever an item passes through a set of blacklisted and 
+ * whitelisted groups(e.g "not_rooms"/"rooms"), and makes the calling 
+ * function return true/false if it is explicitely in a filtered list, 
+ * or does nothing otherwise, to allow for chaining multiple filters. */
+#define DAFiltered(blacklist, whitelist, item) \
+    do \
+    { \
+        size_t i, count; \
+        count = ArraySize(blacklist); \
+        for (i = 0; i < count; i++) \
+        { \
+            char *notItem = ArrayGet(blacklist, i); \
+            if (StrEquals(item, notItem)) \
+            { \
+                return true; \
+            } \
+        } \
+        count = ArraySize(whitelist); \
+        if (count) \
+        { \
+            for (i = 0; i < count; i++) \
+            { \
+                char *yesItem = ArrayGet(whitelist, i); \
+                if (StrEquals(yesItem, item)) \
+                { \
+                    return false; \
+                } \
+            } \
+            return true; \
+        } \
+    } while (0)
 
+static bool
+IsSenderFiltered(Filter *filter, char *senderID)
+{
+    if (!filter || !senderID)
+    {
+        return false;
+    }
+
+    DAFiltered(
+        filter->room.account_data.not_senders, 
+        filter->room.account_data.senders, 
+        senderID
+    );
+    DAFiltered(
+        filter->room.state.not_senders, 
+        filter->room.state.senders, 
+        senderID
+    );
+    DAFiltered(
+        filter->room.ephemeral.not_senders, 
+        filter->room.ephemeral.senders, 
+        senderID
+    );
+    return false;
+}
 bool
 IsRoomFiltered(Filter *filter, char *roomID)
 {
-    size_t i, count;
     if (!filter || !roomID)
     {
         return false;
     }
 
-    count = ArraySize(filter->room.not_rooms);
+    DAFiltered(
-    for (i = 0; i < count; i++)
+        filter->room.not_rooms, 
-    {
+        filter->room.rooms, 
-        char *notRoom = ArrayGet(filter->room.not_rooms, i);
+        roomID
-        if (StrEquals(roomID, notRoom))
+    );
-        {
+    DAFiltered(
-            return true;
+        filter->room.account_data.not_rooms, 
-        }
+        filter->room.account_data.rooms, 
-    }
+        roomID
-
+    );
-    count = ArraySize(filter->room.rooms);
+    DAFiltered(
-    if (count)
+        filter->room.state.not_rooms, 
-    {
+        filter->room.state.rooms, 
-        for (i = 0; i < count; i++)
+        roomID
-        {
+    );
-            char *room = ArrayGet(filter->room.rooms, i);
+    DAFiltered(
-            if (StrEquals(roomID, room))
+        filter->room.ephemeral.not_rooms, 
-            {
+        filter->room.ephemeral.rooms, 
-                return false;
+        roomID
-            }
+    );
-        }
-        return true;
-    }
     return false;
 }
 
+/* TODO: MORE FILTERS! */
 HashMap *
 FilterApply(Filter * filter, HashMap * event)
 {
@@ -86,15 +139,17 @@ FilterApply(Filter * filter, HashMap * event)
     sender = JsonValueAsString(HashMapGet(event, "sender"));
     room = JsonValueAsString(HashMapGet(event, "room_id"));
 
-    if (IsRoomFiltered(filter, room))
+    if (IsRoomFiltered(filter, room) ||
+        IsSenderFiltered(filter, sender))
     {
         return NULL;
     }
     copy = JsonDuplicate(event);
 
-    (void) sender;
     return copy;
 }
+
+
 Filter *
 FilterDecode(Db *db, char *user, char *filterStr)
 {

src/Routes/RouteSync.c

@@ -138,23 +138,9 @@ ROUTE_IMPL(RouteSync, path, argp)
     else if (timeout && timeoutDuration)
     {
         char *name = StrDuplicate(UserGetName(user));
-        int passed = 0;
 
         UserUnlock(user);
-
+        UserAwaitNotification(name, timeoutDuration);
-        /* TODO: Using pthreads' condition variables with a timeout would be 
-         * the best way to proceed (as in Parsee's ParseeAwaitStanza function).
-         * Also, how would Cytoplasm proceed if the all of HTTP threads are used 
-         * for syncing? That sounds like a really bad bottleneck... */
-        while (passed < timeoutDuration)
-        {
-            if (UserGetNotification(name))
-            {
-                break;
-            }
-            UtilSleepMillis(100);
-            passed += 100;
-        }
         Free(name);
         user = UserAuthenticate(db, token);
     }

src/User.c

@@ -34,8 +34,9 @@
 #include <Parser.h>
 #include <Room.h>
 
-#include <string.h>
 #include <pthread.h>
+#include <string.h>
+#include <errno.h>
 
 struct User
 {
@@ -1637,6 +1638,16 @@ UserSyncExists(User *user, char *sync)
     return DbLock(user->db, 4, "users", user->name, "sync", sync);
 }
 
+typedef struct NotificationEntry {
+    enum {
+        NOTIF_AWAIT,
+        NOTIF_GOTTEN
+    } type;
+
+    pthread_mutex_t lock;
+    pthread_cond_t cond;
+    bool notified;
+} NotificationEntry;
 
 extern void 
 UserInitialisePushTable(void)
@@ -1655,29 +1666,34 @@ UserInitialisePushTable(void)
 void
 UserNotifyUser(User *user)
 {
+    NotificationEntry *entry;
     if (!user || !pushTable)
     {
         return;
     }
     pthread_mutex_lock(&pushLock);
-    HashMapSet(pushTable, user->name, user->name);
+    entry = HashMapGet(pushTable, user->name);
+    if (entry && entry->type == NOTIF_AWAIT)
+    {
+        pthread_mutex_lock(&entry->lock);
+        entry->notified = true;
+        pthread_cond_signal(&entry->cond);
+        pthread_mutex_unlock(&entry->lock);
+
         pthread_mutex_unlock(&pushLock);
+        return;
+    }
+    else if (!entry)
+    {
+        entry = Malloc(sizeof(*entry));
+        entry->type = NOTIF_GOTTEN;
+
+        pthread_mutex_unlock(&pushLock);
+        return;
     }
 
-bool
+    /* There was already a notification on the line. */
-UserGetNotification(char *user)
-{
-    bool ret;
-    if (!user || !pushTable)
-    {
-        return false;
-    }
-    pthread_mutex_lock(&pushLock);
-    ret = !!HashMapGet(pushTable, user);
-    HashMapDelete(pushTable, user);
     pthread_mutex_unlock(&pushLock);
-
-    return ret;
 }
 
 void
@@ -1694,3 +1710,94 @@ UserDestroyPushTable(void)
     pthread_mutex_unlock(&pushLock);
     pthread_mutex_destroy(&pushLock);
 }
+
+bool
+UserAwaitNotification(char *user, int await)
+{
+    NotificationEntry *entry, ownEntry;
+    struct timespec timeout;
+    int code;
+    bool timedout = false, notified = false;
+    if (!user)
+    {
+        return false;
+    }
+
+    if (await < 0)
+    {
+        /* 30 seconds */
+        await = 30000;
+    }
+    
+    pthread_mutex_lock(&pushLock);
+
+    /* Check if we got any notifications yet. */
+    entry = HashMapGet(pushTable, user);
+    if (entry && entry->type == NOTIF_GOTTEN)
+    {
+        /* Got a notification entry already. */
+        Free(entry);
+        HashMapDelete(pushTable, user);
+        pthread_mutex_unlock(&pushLock);
+
+        return true;
+    }
+    else if (entry)
+    {
+        /* Another thread's awaiting...
+         * TODO: Manage these conditions. */
+        Log(LOG_ERR, 
+            "Unimplemented feature: awaiting for other threads."
+        );
+
+        pthread_mutex_unlock(&pushLock);
+        return false;
+    }
+
+    /* No one's waiting or notifying; let's create our own entry, 
+     * and await for something(NOTE that we're not allocating from 
+     * the heap, since I've noticed some strange behaviour with 
+     * Cytoplasm on ARM64... This is a hack and deserves to be fixed). */
+    entry = &ownEntry;
+    entry->type = NOTIF_AWAIT;
+    entry->notified = false;
+    pthread_mutex_init(&entry->lock, NULL);
+    pthread_cond_init(&entry->cond, NULL);
+    HashMapSet(pushTable, user, entry);
+    pthread_mutex_unlock(&pushLock);
+
+    /* Now, it's time for us to wait. */
+    clock_gettime(CLOCK_REALTIME, &timeout);
+    timeout.tv_sec += await / 1000;
+    timeout.tv_nsec += (await % 1000) * 1000000;
+    if (timeout.tv_nsec > 999999999)
+    {
+        uint64_t driftSeconds = timeout.tv_nsec / 1000000000;
+        uint64_t driftMicros = timeout.tv_nsec % 1000000000;
+
+        timeout.tv_nsec = driftMicros;
+        timeout.tv_sec += driftSeconds;
+    }
+
+    pthread_mutex_lock(&entry->lock);
+    while (!entry->notified)
+    {
+        code = pthread_cond_timedwait(&entry->cond, &entry->lock, &timeout);
+        if ((code == ETIMEDOUT))
+        {
+            timedout = true;
+            break;
+        }
+    }
+    pthread_mutex_unlock(&entry->lock);
+    pthread_mutex_destroy(&entry->lock);
+    pthread_cond_destroy(&entry->cond);
+
+    notified = !timedout && entry->notified;
+
+    pthread_mutex_lock(&pushLock);
+    HashMapDelete(pushTable, user);
+    pthread_mutex_unlock(&pushLock);
+
+    return notified;
+}

src/include/User.h

@@ -471,10 +471,11 @@ extern void UserInitialisePushTable(void);
 extern void UserNotifyUser(User *);
 
 /**
- * Verifies if the user has been notified, and if it is, then 
+ * Waits for a notification for a specific user for a specific 
- * removes the notification
+ * duration in milliseconds to wait (with 30000ms being the default, 
+ * if the value is negative), and returns true if anything came up.
  */
-extern bool UserGetNotification(char *);
+extern bool UserAwaitNotification(char *, int);
 
 /**
  * Destroys the temporary push table created by