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feat(gas-profiler): show friendly syncing state when backend nodes are unavailable #420

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Merged
mattevans merged 1 commit into from
Feb 12, 2026
Merged

feat(gas-profiler): show friendly syncing state when backend nodes are unavailable #420

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84 changes: 75 additions & 9 deletions src/pages/ethereum/execution/gas-profiler/SimulatePage.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -105,6 +105,19 @@ function getDeltaColor(percent: number): string {
return 'text-muted';
}

/** Detect backend syncing errors (503 from the proxy). */
function isSyncingError(error: unknown): boolean {
if (error instanceof Error) {
return error.message.includes('currently syncing');
}

if (typeof error === 'string') {
return error.includes('currently syncing');
}

return false;
}

function calculateAggregateStats(results: BlockSimulationResult[]): AggregateStats {
const stats = results.reduce(
(acc, result) => {
Expand Down Expand Up @@ -824,14 +837,37 @@ export function SimulatePage(): JSX.Element {
Loading gas parameters...
</div>
)}
{defaultsError && (
<Alert
variant="error"
description={`Error loading gas schedule: ${defaultsError.message}`}
accentBorder
className="mt-3"
/>
)}
{defaultsError &&
(isSyncingError(defaultsError) ? (
<div
className="mt-3 overflow-hidden rounded-sm border border-amber-400/30 dark:border-amber-500/20"
role="status"
aria-live="polite"
>
<div className="flex items-start gap-3 bg-amber-50/80 p-3.5 dark:bg-amber-500/5">
<div className="flex size-8 shrink-0 items-center justify-center rounded-xs bg-amber-100 dark:bg-amber-500/15">
<ArrowPathIcon
className="size-4 animate-spin text-amber-600 dark:text-amber-400"
style={{ animationDuration: '2s' }}
/>
</div>
<div className="min-w-0 flex-1">
<p className="text-sm/5 font-medium text-amber-800 dark:text-amber-200">Backend nodes are syncing</p>
<p className="mt-0.5 text-xs/4 text-amber-700/70 dark:text-amber-300/60">
The nodes serving this network are catching up with the chain. Check back shortly and try again.
</p>
</div>
</div>
<div className="h-px animate-pulse bg-linear-to-r from-transparent via-amber-400/50 to-transparent" />
</div>
) : (
<Alert
variant="error"
description={`Error loading gas schedule: ${defaultsError.message}`}
accentBorder
className="mt-3"
/>
))}
{gasWarning && modifiedCount === 0 && (
<Alert
variant="warning"
Expand Down Expand Up @@ -946,7 +982,37 @@ export function SimulatePage(): JSX.Element {
{/* Error */}
{simState.status === 'error' && (
<div className="mb-4">
<Alert variant="error" title="Simulation failed" description={simState.error ?? 'Unknown error'} />
{isSyncingError(simState.error) ? (
<Card className="overflow-hidden">
<div className="flex items-start gap-4 p-5" role="status" aria-live="polite">
<div className="relative flex size-10 shrink-0 items-center justify-center">
<div
className="absolute inset-0 animate-ping rounded-full bg-amber-400/15"
style={{ animationDuration: '3s' }}
/>
<div className="flex size-10 items-center justify-center rounded-full bg-amber-100 dark:bg-amber-500/10">
<ArrowPathIcon
className="size-5 animate-spin text-amber-500 dark:text-amber-400"
style={{ animationDuration: '2s' }}
/>
</div>
</div>
<div className="min-w-0 flex-1">
<h3 className="text-sm font-semibold text-foreground">Backend Syncing</h3>
<p className="mt-1 text-sm/5 text-muted">
The simulation was interrupted because all backend nodes for this network are currently syncing with
the chain.
{simState.completedBlocks > 0 &&
` ${simState.completedBlocks} of ${simState.totalBlocks} blocks completed before the interruption.`}{' '}
Check back shortly and try again.
</p>
</div>
</div>
<div className="h-px animate-pulse bg-linear-to-r from-transparent via-amber-400/40 to-transparent" />
</Card>
) : (
<Alert variant="error" title="Simulation failed" description={simState.error ?? 'Unknown error'} />
)}
</div>
)}

Expand Down