fix(code): hydrate cloud runs after renderer reload

apps/code/src/renderer/features/sessions/hooks/useSessionConnection.ts

@@ -80,6 +80,7 @@ export function useSessionConnection({
       () => {
         queryClient.invalidateQueries({ queryKey: ["tasks"] });
       },
+      task.latest_run?.log_url,
     );
     return cleanup;
   }, [
@@ -91,6 +92,7 @@ export function useSessionConnection({
     queryClient,
     task.id,
     task.latest_run?.id,
+    task.latest_run?.log_url,
   ]);
 
   useEffect(() => {

apps/code/src/renderer/features/sessions/service/service.test.ts

@@ -552,6 +552,59 @@ describe("SessionService", () => {
       );
     });
 
+    it("hydrates a fresh cloud session from persisted logs before replay arrives", async () => {
+      const service = getSessionService();
+      const hydratedSession = createMockSession({
+        taskRunId: "run-123",
+        taskId: "task-123",
+        taskTitle: "Cloud Task",
+        status: "disconnected",
+        isCloud: true,
+        events: [],
+      });
+
+      mockSessionStoreSetters.getSessionByTaskId.mockImplementation(() => {
+        return hydratedSession;
+      });
+      mockTrpcLogs.readLocalLogs.query.mockResolvedValue("");
+      mockTrpcLogs.fetchS3Logs.query.mockResolvedValue(
+        JSON.stringify({
+          type: "notification",
+          timestamp: "2024-01-01T00:00:00Z",
+          notification: {
+            method: "session/update",
+            params: {
+              update: {
+                sessionUpdate: "assistant_message",
+              },
+            },
+          },
+        }),
+      );
+      mockTrpcLogs.writeLocalLogs.mutate.mockResolvedValue(undefined);
+
+      service.watchCloudTask(
+        "task-123",
+        "run-123",
+        "https://api.anthropic.com",
+        123,
+        undefined,
+        "https://logs.example.com/run-123",
+      );
+
+      await vi.waitFor(() => {
+        expect(mockSessionStoreSetters.updateSession).toHaveBeenCalledWith(
+          "run-123",
+          expect.objectContaining({
+            events: [],
+            isCloud: true,
+            logUrl: "https://logs.example.com/run-123",
+            processedLineCount: 1,
+          }),
+        );
+      });
+    });
+
     it("ignores stale async starts when the same watcher is replaced", async () => {
       const service = getSessionService();
       let resolveFirstWatchStart!: () => void;

apps/code/src/renderer/features/sessions/service/service.ts

@@ -1917,6 +1917,7 @@ export class SessionService {
     apiHost: string,
     teamId: number,
     onStatusChange?: () => void,
+    logUrl?: string,
   ): () => void {
     const taskRunId = runId;
     const startToken = ++this.nextCloudTaskWatchToken;
@@ -1947,6 +1948,11 @@ export class SessionService {
       existing?.taskRunId === taskRunId &&
       existing.events.length > 0 &&
       existing.processedLineCount === undefined;
+    const shouldHydrateSession =
+      !existing ||
+      existing.taskRunId !== taskRunId ||
+      shouldResetExistingSession ||
+      existing.events.length === 0;
 
     if (
       !existing ||
@@ -1964,6 +1970,10 @@ export class SessionService {
       });
     }
 
+    if (shouldHydrateSession) {
+      this.hydrateCloudTaskSessionFromLogs(taskId, taskRunId, logUrl);
+    }
+
     // Subscribe before starting the main-process watcher so the first replayed
     // SSE/log burst cannot race ahead of the renderer subscription.
     const subscription = trpcClient.cloudTask.onUpdate.subscribe(
@@ -2025,6 +2035,46 @@ export class SessionService {
     return () => {};
   }
 
+  private hydrateCloudTaskSessionFromLogs(
+    taskId: string,
+    taskRunId: string,
+    logUrl?: string,
+  ): void {
+    void (async () => {
+      const { rawEntries } = await this.fetchSessionLogs(logUrl, taskRunId);
+      if (rawEntries.length === 0) {
+        return;
+      }
+
+      const session = sessionStoreSetters.getSessionByTaskId(taskId);
+      if (!session || session.taskRunId !== taskRunId) {
+        return;
+      }
+
+      // If live updates already populated a processed count, don't overwrite
+      // that newer state with the persisted baseline fetched during startup.
+      if (
+        session.processedLineCount !== undefined &&
+        session.processedLineCount > 0
+      ) {
+        return;
+      }
+
+      sessionStoreSetters.updateSession(taskRunId, {
+        events: convertStoredEntriesToEvents(rawEntries),
+        isCloud: true,
+        logUrl: logUrl ?? session.logUrl,
+        processedLineCount: rawEntries.length,
+      });
+    })().catch((err: unknown) => {
+      log.warn("Failed to hydrate cloud task session from logs", {
+        taskId,
+        taskRunId,
+        err,
+      });
+    });
+  }
+
   private isCurrentCloudTaskWatcher(
     taskId: string,
     runId: string,