When booting a session, retry every five seconds if unable to send the request.

This is intended to transparently resume the session (using `boot` to start over) after more serious connection interruptions. It interacts with the heartbeat timeout: we let the browser try to reconnect through `EventSource` on its own for up to 30 seconds, before intervening, closing the event source, and starting attempts to call `boot`.

This covers both initial boot, which will now hang if the server is unavailable (sorry), and reconnection after an event timeout. No other operations are retried (particularly, sending a message is _not_ retried).

1 files changed, 14 insertions, 10 deletions

diff --git a/ui/lib/session.svelte.js b/ui/lib/session.svelte.js
index b953d9c..21a391d 100644
--- a/ui/lib/session.svelte.js
+++ b/ui/lib/session.svelte.js
@@ -94,16 +94,20 @@ class Session {
 }
 
 async function bootOrNavigate(navigateTo) {
-  const response = await api.boot();
-  switch (response.status) {
-    case 401:
-      await navigateTo('/login');
-      break;
-    case 503:
-      await navigateTo('/setup');
-      break;
-    case 200:
-      return response.data;
+  try {
+    const response = await api.retry(async () => await api.boot());
+    return response.data;
+  } catch (err) {
+    switch (true) {
+      case err instanceof api.LoggedOut:
+        await navigateTo('/login');
+        break;
+      case err instanceof api.SetupRequired:
+        await navigateTo('/setup');
+        break;
+      default:
+        throw err;
+    }
   }
 }