feature: add a mam_sync_limit tab option

doc/source/configuration.rst

@@ -868,6 +868,14 @@ Options related to logging.
         If ``true``, will try to fill local logs with missing MAM history
         when opening a tab or joining a room.
 
+    mam_sync_limit
+
+        **Default value:** ``2000``
+
+        Maximum number of messages to fetch on a MAM sync. Will affect
+        performance when joining rooms with a huge backlog for the first time
+        or after a long period.
+
 Plugins
 ~~~~~~~
 

poezio/config.py

@@ -93,6 +93,7 @@ DEFAULT_CONFIG: ConfigDict = {
         'log_dir': '',
         'log_errors': True,
         'mam_sync': True,
+        'mam_sync_limit': 2000,
         'max_lines_in_memory': 2048,
         'max_messages_in_memory': 2048,
         'max_nick_length': 25,

poezio/log_loader.py

@@ -265,14 +265,15 @@ class MAMFiller:
     logger: Logger
     future: asyncio.Future
     done: asyncio.Event
-    max_msgs: int = 2000
+    limit: int
 
-    def __init__(self, logger: Logger, tab: tabs.ChatTab):
+    def __init__(self, logger: Logger, tab: tabs.ChatTab, limit: int = 2000):
         self.tab = tab
         self.logger = logger
         logger.fd_busy(tab.jid)
         self.future = asyncio.ensure_future(self.fetch_routine())
         self.done = asyncio.Event()
+        self.limit = limit
 
     def cancel(self) -> None:
         """Cancel the routine and signal the end."""
@@ -292,7 +293,7 @@ class MAMFiller:
                 messages = await fetch_history(
                     self.tab,
                     start=last_msg_time,
-                    amount=self.max_msgs,
+                    amount=self.limit,
                 )
                 log.debug(
                     'Fetched %s messages to fill local logs for %s',

poezio/tabs/basetabs.py

@@ -1014,7 +1014,8 @@ class OneToOneTab(ChatTab):
         use_log = config.get_by_tabname('use_log', self.jid)
         mam_sync = config.get_by_tabname('mam_sync', self.jid)
         if use_log and mam_sync:
-            self.mam_filler = MAMFiller(logger, self)
+            limit = config.get_by_tabname('mam_sync_limit', self.jid)
+            self.mam_filler = MAMFiller(logger, self, limit)
         asyncio.ensure_future(
             LogLoader(logger, self, use_log).tab_open()
         )

poezio/tabs/muctab.py

@@ -181,7 +181,8 @@ class MucTab(ChatTab):
         use_log = config.get_by_tabname('mam_sync', self.general_jid)
         mam_sync = config.get_by_tabname('mam_sync', self.general_jid)
         if self.mam_filler is None and use_log and mam_sync:
-            self.mam_filler = MAMFiller(logger, self)
+            limit = config.get_by_tabname('mam_sync_limit', self.jid)
+            self.mam_filler = MAMFiller(logger, self, limit)
         muc.join_groupchat(
             self.core,
             self.jid.bare,