matrix-rust-sdk

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Commit `7873e6c41daf`

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atagen <boss@atagen.co>2026-10-26 02:52 UTC

1 file changed+7-1

sync-service: back off the offline probe

wait_to_be_online relied on the request's retry config, which the wasm transport ignores and which never retries a 4xx such as a dead token, so a device build asked for /versions every ~105ms (248 times in 43s).

Modified file: crates/matrix-sdk-ui/src/sync_service.rs+7 additions−1 deletions@@ -186,6 +186,9 @@ impl SyncTaskSupervisor {
         };
 
         let wait_to_be_online = async move {
+            // the wasm transport ignores `RequestConfig`, and a 4xx such as a dead token is never
+            // retried, so without growing the pause this asks for /versions every 100ms
+            let mut pause = Duration::from_millis(100);
             loop {
                 // Encountering network failures when sending a request which has with no retry
                 // limit set in the `RequestConfig` are treated as permanent failures and our
@@ -203,7 +206,10 @@ impl SyncTaskSupervisor {
                 // case.
                 match client.fetch_server_versions(Some(request_config)).await {
                     Ok(_) => break,
-                    Err(_) => sleep(Duration::from_millis(100)).await,
+                    Err(_) => {
+                        sleep(pause).await;
+                        pause = (pause * 2).min(Duration::from_secs(10));
+                    }
                 }
             }
         };

matrix-rust-sdk

Commit 7873e6c41daf

Commit `7873e6c41daf`