Changeset 9e83b15 for protocols/bee_user.c

Timestamp:

2018-07-03T05:58:47Z (6 years ago)

Author:

dequis <dx@…>

Branches:

master

Children:

c17d0af

Parents:

49ab3cb

git-author:

dequis <dx@…> (03-07-18 05:27:59)

git-committer:

dequis <dx@…> (03-07-18 05:58:47)

Message:

Add a hash table to speed up bee_user_by_handle()

This maintains a hash table next to the linked list, which results in
negligible additional memory usage (~300kb for 10k users) but allows
instant lookups.

This was a big problem with discord, which has huge user lists and joins
everyone to every channel. In my test, the GUILD_SYNC event for 10k-50k
user lists is now approximately 5 times faster.

This hash table based code is only used if handle_cmp is either
exact or case-insensitive string comparison (g_ascii_strcasecmp or
strcmp/g_strcmp0).

The old function that goes through the bee->users linked list is now
called bee_user_by_handle_slow() and used for protocols with unusual
handle_cmp functions - skimming through the code, just oscar.
May revisit this if it happens to more meaningful protocols.

The case-insensitive hashtable functions are copied from irssi, which is
also GPLv2. I renamed them from g_ to b_ (g_istr_equal to b_istr_equal)

File:

• protocols/bee_user.c (modified) (4 diffs)

protocols/bee_user.c

@@ -42 +42 @@
         bee->users = g_slist_prepend(bee->users, bu);
 
+        if (ic->bee_users) {
+                g_hash_table_insert(ic->bee_users, bu->handle, bu);
+        }
         if (bee->ui->user_new) {
                 bee->ui->user_new(bee, bu);
@@ -67 +70 @@
                 bu->ic->acc->prpl->buddy_data_free(bu);
         }
-
+        if (bu->ic->bee_users) {
+                g_hash_table_remove(bu->ic->bee_users, bu->handle);
+        }
         bee->users = g_slist_remove(bee->users, bu);
 
@@ -80 +85 @@
 }
 
-bee_user_t *bee_user_by_handle(bee_t *bee, struct im_connection *ic, const char *handle)
+bee_user_t *bee_user_by_handle_slow(bee_t *bee, struct im_connection *ic, const char *handle)
 {
         GSList *l;
@@ -93 +98 @@
 
         return NULL;
+}
+
+bee_user_t *bee_user_by_handle(bee_t *bee, struct im_connection *ic, const char *handle)
+{
+        if (!ic->bee_users) {
+                return bee_user_by_handle_slow(bee, ic, handle);
+        }
+
+        return g_hash_table_lookup(ic->bee_users, handle);
 }