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add comments to chat component

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This commit is contained in:
Ramnique Singh 2025-07-31 11:36:16 +05:30
parent faef91f0a1
commit 659b23ae2b
1 changed files with 13 additions and 1 deletions
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14
apps/rowboat/app/projects/[projectId]/playground/components/chat.tsx
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@ -35,6 +35,12 @@ export function Chat({
const [billingError, setBillingError] = useState<string | null>(null);
const [lastAgenticRequest, setLastAgenticRequest] = useState<unknown | null>(null);
const [lastAgenticResponse, setLastAgenticResponse] = useState<unknown | null>(null);
// Optimistic messages for real-time streaming UX:
// - messages: source of truth, only updated when responses are complete
// - optimisticMessages: what user sees, updated in real-time during streaming
// This separation allows immediate visual feedback while maintaining data integrity
// and clean error recovery (rollback to last known good state on failures)
const [optimisticMessages, setOptimisticMessages] = useState<z.infer<typeof Message>[]>([]);
const [isLastInteracted, setIsLastInteracted] = useState(false);
const [showFeedbackModal, setShowFeedbackModal] = useState(false);
@ -166,7 +172,8 @@ export function Chat({
onCopyClick(getCopyContent);
}, [getCopyContent, onCopyClick]);
// reset optimistic messages when messages change
// Keep optimistic messages in sync with committed messages
// This ensures UI shows the latest confirmed state when messages are updated
useEffect(() => {
setOptimisticMessages(messages);
}, [messages]);
@ -240,10 +247,12 @@ export function Chat({
const data = JSON.parse(event.data);
const parsedMsg = Message.parse(data);
msgs.push(parsedMsg);
// Update optimistic messages immediately for real-time streaming UX
setOptimisticMessages(prev => [...prev, parsedMsg]);
} catch (err) {
console.error('Failed to parse SSE message:', err);
setFetchResponseError(`Failed to parse SSE message: ${err instanceof Error ? err.message : 'Unknown error'}`);
// Rollback to last known good state on parsing errors
setOptimisticMessages(messages);
}
});
@ -263,6 +272,7 @@ export function Chat({
messages: msgs
});
// Commit all streamed messages atomically to the source of truth
setMessages([...messages, ...msgs]);
setLoadingAssistantResponse(false);
});
@ -278,6 +288,7 @@ export function Chat({
if (!ignore) {
setLoadingAssistantResponse(false);
setFetchResponseError('Error: ' + JSON.parse(event.data).error);
// Rollback to last known good state on stream errors
setOptimisticMessages(messages);
}
});
@ -287,6 +298,7 @@ export function Chat({
if (!ignore) {
setLoadingAssistantResponse(false);
setFetchResponseError('Stream connection failed');
// Rollback to last known good state on connection errors
setOptimisticMessages(messages);
}
};