feat: Add a config option to change the max TL size for legacy sync

conduwuit-example.toml

@@ -1196,6 +1196,13 @@
 #
 #typing_client_timeout_max_s = 45
 
+# The maximum number of events to send at once for non-limited legacy syncs.
+# Has no effect on sliding sync. This parameter also affects how many messages from each room
+# are sent to the client on initial syncs, and larger values will make initial syncs slower.
+# The default of 10 is reasonable for most use cases.
+#
+#incremental_sync_max_timeline_size = 10
+
 # Set this to true for continuwuity to compress HTTP response bodies using
 # zstd. This option does nothing if continuwuity was not built with
 # `zstd_compression` feature. Please be aware that enabling HTTP

src/api/client/sync/v3/joined.rs

@@ -110,7 +110,7 @@ pub(super) async fn load_joined_room(
 		room_id,
 		previous_sync_end_count,
 		Some(next_batchcount),
-		10_usize,
+		services.config.incremental_sync_max_timeline_size,
 	);
 
 	let receipt_events = services

src/api/client/sync/v3/left.rs

@@ -146,7 +146,7 @@ pub(super) async fn load_left_room(
 						room_id,
 						Some(timeline_start_count),
 						Some(timeline_end_count),
-						10_usize,
+						services.config.incremental_sync_max_timeline_size,
 					)
 					.await?;
 

src/core/config/mod.rs

@@ -1384,6 +1384,16 @@ pub struct Config {
 	#[serde(default = "default_typing_client_timeout_max_s")]
 	pub typing_client_timeout_max_s: u64,
 
+	/// The maximum number of events to send at once for non-limited legacy
+	/// syncs. Has no effect on sliding sync. This parameter also affects how
+	/// many messages from each room are sent to the client on initial syncs;
+	/// larger values will make initial syncs slower. The default of 10 is
+	/// reasonable for most use cases.
+	///
+	/// default: 10
+	#[serde(default = "default_incremental_sync_max_timeline_size")]
+	pub incremental_sync_max_timeline_size: usize,
+
 	/// Set this to true for continuwuity to compress HTTP response bodies using
 	/// zstd. This option does nothing if continuwuity was not built with
 	/// `zstd_compression` feature. Please be aware that enabling HTTP
@@ -2449,6 +2459,8 @@ fn default_typing_client_timeout_min_s() -> u64 { 15 }
 
 fn default_typing_client_timeout_max_s() -> u64 { 45 }
 
+fn default_incremental_sync_max_timeline_size() -> usize { 10 }
+
 fn default_rocksdb_recovery_mode() -> u8 { 1 }
 
 fn default_rocksdb_log_level() -> String { "error".to_owned() }