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feat(frontend): implement optimistic state rollback with toast feedback upon network failure in Activity Feed Component
Implements optimistic UI updates with automatic rollback and toast notifications for enhanced user experience in the Activity Feed Component. Key Features: - Optimistic state management for real-time payment updates - Automatic verification of optimistic payments (3s delay) - Network failure detection and rollback mechanism - Toast notifications for payment events and network errors - Visual indicators for verifying payments (pulsing animation + dot) - Retry action on initial fetch failures Technical Implementation: - Added `isOptimistic` flag to Payment interface - Implemented `verifyPayment` function with 5s timeout - Integrated Sonner toast library for notifications - Added ref-based verification timeout tracking - Enhanced error handling with toast feedback - Mobile and desktop responsive indicators UX Improvements: - Success toast on new payment arrival - Error toast with rollback notification on verification failure - Network error toast with retry action button - Accessibility labels updated for verifying state - Subtle pulsing animation for optimistic payments - Clean state transitions without jarring UI jumps Toast Types: 1. Success: New payment received (3s duration) 2. Error: Payment verification failed with rollback info (5s duration) 3. Error: Network failure with retry action (10s duration) Testing: - Mobile responsiveness maintained - Accessibility (WCAG 2.1 AA) labels enhanced - Optimistic updates roll back correctly on network failure - Toast notifications appear at top-right with close button Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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‎frontend/src/components/ActivityFeed.tsx‎

Lines changed: 164 additions & 54 deletions
Original file line numberDiff line numberDiff line change
@@ -1,8 +1,9 @@
11
"use client";
22

3-
import { useEffect, useState, useCallback, useMemo, memo } from "react";
3+
import { useEffect, useState, useCallback, useMemo, memo, useRef } from "react";
44
import Link from "next/link";
55
import { useLocale } from "next-intl";
6+
import { toast, Toaster } from "sonner";
67
import {
78
useHydrateMerchantStore,
89
useMerchantApiKey,
@@ -19,6 +20,7 @@ interface Payment {
1920
status: string;
2021
description: string | null;
2122
created_at: string;
23+
isOptimistic?: boolean;
2224
}
2325

2426
interface PaymentRowProps {
@@ -42,7 +44,7 @@ const PaymentRow = memo(function PaymentRow({
4244
() => formatAmount(payment.amount, locale, hideCents),
4345
[payment.amount, locale, hideCents],
4446
);
45-
const rowClassName = `group cursor-pointer outline-none transition-all duration-200 ease-in-out hover:bg-pluto-50 hover:shadow-sm active:bg-pluto-100 active:scale-[0.985] focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-pluto-500 ${index % 2 === 0 ? "bg-white" : "bg-[#F9F9F9]"}`;
47+
const rowClassName = `group cursor-pointer outline-none transition-all duration-200 ease-in-out hover:bg-pluto-50 hover:shadow-sm active:bg-pluto-100 active:scale-[0.985] focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-pluto-500 ${index % 2 === 0 ? "bg-white" : "bg-[#F9F9F9]"} ${payment.isOptimistic ? "animate-pulse" : ""}`;
4648
const statusClassName = `inline-flex items-center gap-1.5 rounded-md px-2 py-1 text-[10px] font-bold uppercase tracking-tight ${
4749
payment.status === "confirmed"
4850
? "bg-[#0A0A0A] text-white"
@@ -55,11 +57,14 @@ const PaymentRow = memo(function PaymentRow({
5557
role="row"
5658
tabIndex={0}
5759
className={rowClassName}
58-
aria-label={`Payment ${payment.description || "Transaction"} for ${formattedAmount} ${payment.asset}`}
60+
aria-label={`Payment ${payment.description || "Transaction"} for ${formattedAmount} ${payment.asset}${payment.isOptimistic ? " (Verifying)" : ""}`}
5961
>
6062
<td className="border-l-0 border-transparent px-6 py-4 transition-all duration-200 group-hover:border-l-2 group-hover:border-l-pluto-500">
61-
<div className={statusClassName} aria-label={`Status: ${payment.status}`}>
63+
<div className={statusClassName} aria-label={`Status: ${payment.status}${payment.isOptimistic ? " (Verifying)" : ""}`}>
6264
{payment.status}
65+
{payment.isOptimistic && (
66+
<span className="h-1 w-1 rounded-full bg-current animate-pulse" />
67+
)}
6368
</div>
6469
</td>
6570
<td className="px-6 py-4">
@@ -88,6 +93,7 @@ export default function ActivityFeed() {
8893
const [payments, setPayments] = useState<Payment[]>([]);
8994
const [loading, setLoading] = useState(true);
9095
const [error, setError] = useState<string | null>(null);
96+
const verificationTimeouts = useRef<Map<string, NodeJS.Timeout>>(new Map());
9197

9298
const apiKey = useMerchantApiKey();
9399
const hydrated = useMerchantHydrated();
@@ -97,6 +103,53 @@ export default function ActivityFeed() {
97103

98104
useHydrateMerchantStore();
99105

106+
// Verify optimistic payment with backend
107+
const verifyPayment = useCallback(
108+
async (paymentId: string) => {
109+
try {
110+
if (!apiKey) return;
111+
112+
const apiUrl =
113+
process.env.NEXT_PUBLIC_API_URL || "http://localhost:4000";
114+
const response = await fetch(`${apiUrl}/api/payments/${paymentId}`, {
115+
headers: { "x-api-key": apiKey },
116+
signal: AbortSignal.timeout(5000), // 5s timeout
117+
});
118+
119+
if (!response.ok) {
120+
throw new Error("Verification failed");
121+
}
122+
123+
const data = await response.json();
124+
125+
// Update payment to confirmed if verified
126+
setPayments((prev) =>
127+
prev.map((p) =>
128+
p.id === paymentId
129+
? { ...p, status: data.status || "confirmed", isOptimistic: false }
130+
: p,
131+
),
132+
);
133+
} catch (err) {
134+
// Rollback on verification failure
135+
setPayments((prev) => {
136+
const payment = prev.find((p) => p.id === paymentId);
137+
if (payment?.isOptimistic) {
138+
toast.error("Payment verification failed", {
139+
description: `${formatAmount(payment.amount, locale, hideCents)} ${payment.asset} - Network error, update rolled back`,
140+
duration: 5000,
141+
});
142+
return prev.filter((p) => p.id !== paymentId);
143+
}
144+
return prev;
145+
});
146+
} finally {
147+
verificationTimeouts.current.delete(paymentId);
148+
}
149+
},
150+
[apiKey, locale, hideCents],
151+
);
152+
100153
const handleConfirmed = useCallback(
101154
(event: {
102155
id: string;
@@ -111,21 +164,39 @@ export default function ActivityFeed() {
111164

112165
if (exists) {
113166
updatedList = prev.map((p) =>
114-
p.id === event.id ? { ...p, status: "confirmed" } : p,
167+
p.id === event.id ? { ...p, status: "confirmed", isOptimistic: false } : p,
115168
);
169+
// Clear verification timeout if exists
170+
const timeout = verificationTimeouts.current.get(event.id);
171+
if (timeout) {
172+
clearTimeout(timeout);
173+
verificationTimeouts.current.delete(event.id);
174+
}
116175
} else {
117-
// Brand new payment arrived confirmed
118-
updatedList = [
119-
{
120-
id: event.id,
121-
amount: event.amount,
122-
asset: event.asset,
123-
status: "confirmed",
124-
description: "Real-time payment",
125-
created_at: event.confirmed_at,
126-
},
127-
...prev,
128-
];
176+
// Brand new payment arrived - add optimistically
177+
const newPayment: Payment = {
178+
id: event.id,
179+
amount: event.amount,
180+
asset: event.asset,
181+
status: "confirmed",
182+
description: "Real-time payment",
183+
created_at: event.confirmed_at,
184+
isOptimistic: true,
185+
};
186+
187+
updatedList = [newPayment, ...prev];
188+
189+
// Schedule verification in 3 seconds
190+
const timeout = setTimeout(() => {
191+
verifyPayment(event.id);
192+
}, 3000);
193+
verificationTimeouts.current.set(event.id, timeout);
194+
195+
// Show optimistic toast
196+
toast.success("New payment received", {
197+
description: `${formatAmount(event.amount, locale, hideCents)} ${event.asset}`,
198+
duration: 3000,
199+
});
129200
}
130201

131202
// Sort to ensure highest items are top
@@ -138,9 +209,17 @@ export default function ActivityFeed() {
138209
.slice(0, 10);
139210
});
140211
},
141-
[],
212+
[locale, hideCents, verifyPayment],
142213
);
143214

215+
// Cleanup verification timeouts on unmount
216+
useEffect(() => {
217+
return () => {
218+
verificationTimeouts.current.forEach((timeout) => clearTimeout(timeout));
219+
verificationTimeouts.current.clear();
220+
};
221+
}, []);
222+
144223
usePaymentSocket(merchantId, handleConfirmed);
145224

146225
useEffect(() => {
@@ -166,11 +245,26 @@ export default function ActivityFeed() {
166245

167246
const data = await response.json();
168247
setPayments(data.payments ?? []);
248+
setError(null);
169249
} catch (err) {
170250
if (err instanceof Error && err.name === "AbortError") return;
171-
setError(
172-
err instanceof Error ? err.message : "Failed to load activity",
173-
);
251+
const errorMessage =
252+
err instanceof Error ? err.message : "Failed to load activity";
253+
setError(errorMessage);
254+
255+
// Show toast for network failures
256+
toast.error("Network error", {
257+
description: errorMessage,
258+
action: {
259+
label: "Retry",
260+
onClick: () => {
261+
setLoading(true);
262+
setError(null);
263+
fetchPayments();
264+
},
265+
},
266+
duration: 10000,
267+
});
174268
} finally {
175269
setLoading(false);
176270
}
@@ -182,51 +276,62 @@ export default function ActivityFeed() {
182276

183277
if (loading) {
184278
return (
185-
<div className="space-y-4 animate-pulse">
186-
{[...Array(3)].map((_, i) => (
187-
<div key={i} className="h-14 w-full rounded-lg bg-[#F5F5F5] sm:h-16" />
188-
))}
189-
</div>
279+
<>
280+
<Toaster position="top-right" richColors closeButton />
281+
<div className="space-y-4 animate-pulse">
282+
{[...Array(3)].map((_, i) => (
283+
<div key={i} className="h-14 w-full rounded-lg bg-[#F5F5F5] sm:h-16" />
284+
))}
285+
</div>
286+
</>
190287
);
191288
}
192289

193290
if (error) {
194291
return (
195-
<div className="rounded-xl border border-red-500/30 p-4 text-red-400">
196-
{error}
197-
</div>
292+
<>
293+
<Toaster position="top-right" richColors closeButton />
294+
<div className="rounded-xl border border-red-500/30 p-4 text-red-400">
295+
{error}
296+
</div>
297+
</>
198298
);
199299
}
200300

201301
if (payments.length === 0) {
202302
return (
203-
<div className="flex flex-col items-center justify-center rounded-lg border border-[#E8E8E8] bg-[#F9F9F9] p-8 text-center sm:p-16">
204-
<h3 className="mb-3 text-lg font-bold text-[#0A0A0A] sm:text-xl">
205-
No activity detected
206-
</h3>
207-
<p className="mb-8 max-w-sm text-sm font-medium text-[#6B6B6B] sm:text-base">
208-
Your live feed will populate here once you start receiving payments.
209-
Create a link to get started.
210-
</p>
211-
<Link
212-
href="/dashboard/create"
213-
className="w-full rounded-[6px] bg-[#0A0A0A] px-6 py-3 text-sm font-semibold text-white transition-all hover:bg-[#222] sm:w-auto"
214-
>
215-
Create First Payment
216-
</Link>
217-
</div>
303+
<>
304+
<Toaster position="top-right" richColors closeButton />
305+
<div className="flex flex-col items-center justify-center rounded-lg border border-[#E8E8E8] bg-[#F9F9F9] p-8 text-center sm:p-16">
306+
<h3 className="mb-3 text-lg font-bold text-[#0A0A0A] sm:text-xl">
307+
No activity detected
308+
</h3>
309+
<p className="mb-8 max-w-sm text-sm font-medium text-[#6B6B6B] sm:text-base">
310+
Your live feed will populate here once you start receiving payments.
311+
Create a link to get started.
312+
</p>
313+
<Link
314+
href="/dashboard/create"
315+
className="w-full rounded-[6px] bg-[#0A0A0A] px-6 py-3 text-sm font-semibold text-white transition-all hover:bg-[#222] sm:w-auto"
316+
>
317+
Create First Payment
318+
</Link>
319+
</div>
320+
</>
218321
);
219322
}
220323

221324
return (
222-
<div className="rounded-lg border border-[#E8E8E8] bg-white overflow-hidden">
223-
<div className="flex items-center justify-between border-b border-[#E8E8E8] bg-[#0A0A0A] px-4 py-4 sm:px-6">
224-
<h3 className="font-semibold text-white text-sm">Live Activity Feed</h3>
225-
<div className="flex items-center gap-2 text-[10px] font-bold text-white/70 uppercase tracking-widest">
226-
<span className="h-1.5 w-1.5 rounded-full bg-white animate-pulse" />
227-
Live
325+
<>
326+
<Toaster position="top-right" richColors closeButton />
327+
<div className="rounded-lg border border-[#E8E8E8] bg-white overflow-hidden">
328+
<div className="flex items-center justify-between border-b border-[#E8E8E8] bg-[#0A0A0A] px-4 py-4 sm:px-6">
329+
<h3 className="font-semibold text-white text-sm">Live Activity Feed</h3>
330+
<div className="flex items-center gap-2 text-[10px] font-bold text-white/70 uppercase tracking-widest">
331+
<span className="h-1.5 w-1.5 rounded-full bg-white animate-pulse" />
332+
Live
333+
</div>
228334
</div>
229-
</div>
230335

231336
{/* ── Mobile card list (visible below sm breakpoint) ── */}
232337
<div className="space-y-3 p-4 sm:hidden">
@@ -238,14 +343,15 @@ export default function ActivityFeed() {
238343
Focus-visible: keyboard-navigable with Pluto-500 ring. */
239344
tabIndex={0}
240345
role="row"
241-
aria-label={`Payment ${payment.description || "Transaction"} for ${formatAmount(payment.amount, locale, hideCents)} ${payment.asset}`}
346+
aria-label={`Payment ${payment.description || "Transaction"} for ${formatAmount(payment.amount, locale, hideCents)} ${payment.asset}${payment.isOptimistic ? " (Verifying)" : ""}`}
242347
className={`rounded-lg border p-3 outline-none
243348
transition-all duration-200 ease-in-out
244349
hover:border-l-2 hover:border-l-pluto-500 hover:bg-pluto-50 hover:shadow-sm
245350
active:scale-[0.985] active:bg-pluto-100
246351
focus-visible:ring-2 focus-visible:ring-pluto-500 focus-visible:ring-offset-2
247352
cursor-pointer
248-
${i % 2 === 0 ? "border-[#E8E8E8] bg-white" : "border-[#ECECEC] bg-[#F9F9F9]"}`}
353+
${i % 2 === 0 ? "border-[#E8E8E8] bg-white" : "border-[#ECECEC] bg-[#F9F9F9]"}
354+
${payment.isOptimistic ? "animate-pulse" : ""}`}
249355
>
250356
<div className="mb-2 flex items-start justify-between gap-3">
251357
<p className="truncate text-sm font-semibold text-[#0A0A0A]">
@@ -258,9 +364,12 @@ export default function ActivityFeed() {
258364
? "bg-[#F5F5F5] text-[#6B6B6B] border border-[#E8E8E8]"
259365
: "bg-red-50 text-red-600 border border-red-100"
260366
}`}
261-
aria-label={`Status: ${payment.status}`}
367+
aria-label={`Status: ${payment.status}${payment.isOptimistic ? " (Verifying)" : ""}`}
262368
>
263369
{payment.status}
370+
{payment.isOptimistic && (
371+
<span className="h-1 w-1 rounded-full bg-current animate-pulse" />
372+
)}
264373
</div>
265374
</div>
266375
<div className="flex items-center justify-between gap-3">
@@ -310,5 +419,6 @@ export default function ActivityFeed() {
310419
</table>
311420
</div>
312421
</div>
422+
</>
313423
);
314424
}

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