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… check - Extracted `LogRow` component from `LogsView`. - Implemented `areArraysEqual` helper for efficient tag comparison. - Memoized `LogRow` with custom comparator to prevent unnecessary re-renders when `logs` array reference changes but content remains identical. - This optimization is crucial for performance when polling logs or receiving updates, as it avoids re-rendering the entire list when only object references change.
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Summary of ChangesHello @Dexploarer, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request significantly enhances the rendering performance of the Highlights
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![codereviewbot-ai[bot]](https://avatars.githubusercontent.com/in/309638?s=60&v=4){kind=small}
| logs.map((entry: LogEntry, idx: number) => ( | ||
| <div | ||
| key={idx} | ||
| className="font-mono text-xs px-2 py-1 border-b border-border flex gap-2 items-baseline" | ||
| data-testid="log-entry" | ||
| > | ||
| {/* Timestamp */} | ||
| <span className="text-muted whitespace-nowrap"> | ||
| {new Date(entry.timestamp).toLocaleTimeString()} | ||
| </span> | ||
|
|
||
| {/* Level */} | ||
| <span | ||
| className={`font-semibold w-[44px] uppercase text-[11px] ${ | ||
| entry.level === "error" | ||
| ? "text-danger" | ||
| : entry.level === "warn" | ||
| ? "text-warn" | ||
| : "text-muted" | ||
| }`} | ||
| > | ||
| {entry.level} | ||
| </span> | ||
|
|
||
| {/* Source */} | ||
| <span className="text-muted w-16 overflow-hidden text-ellipsis whitespace-nowrap text-[11px]"> | ||
| [{entry.source}] | ||
| </span> | ||
|
|
||
| {/* Tag badges */} | ||
| <span className="inline-flex gap-0.5 shrink-0"> | ||
| {(entry.tags ?? []).map((t: string, ti: number) => { | ||
| const c = TAG_COLORS[t]; | ||
| return ( | ||
| <span | ||
| key={ti} | ||
| className="inline-block text-[10px] px-1.5 py-px rounded-lg mr-0.5" | ||
| style={{ | ||
| background: c ? c.bg : "var(--bg-muted)", | ||
| color: c ? c.fg : "var(--muted)", | ||
| fontFamily: "var(--font-body, sans-serif)", | ||
| }} | ||
| > | ||
| {t} | ||
| </span> | ||
| ); | ||
| })} | ||
| </span> | ||
|
|
||
| {/* Message */} | ||
| <span className="flex-1 break-all">{entry.message}</span> | ||
| </div> | ||
| <LogRow key={idx} entry={entry} /> |
There was a problem hiding this comment.
Using the array index (idx) as the React key for <LogRow /> can cause rendering issues if the logs array changes dynamically (e.g., items are inserted, removed, or reordered). This may lead to inefficient rendering or UI bugs.
Recommendation: Use a unique, stable identifier from LogEntry (such as a log id or a unique timestamp) as the key:
<LogRow key={entry.id} entry={entry} />If no unique id exists, and timestamp is guaranteed unique, use that instead.
![gemini-code-assist[bot]](https://avatars.githubusercontent.com/in/956858?s=60&v=4){kind=small}
There was a problem hiding this comment.
Code Review
This pull request effectively optimizes the rendering of the LogsView by extracting the log row into a memoized LogRow component. This is a great improvement that will prevent unnecessary re-renders, especially when polling for new logs. The custom equality check for React.memo is well-implemented. I have one suggestion to improve the stability of the list rendering by using a more stable key than the array index, which will make your optimization even more effective.
| logs.map((entry: LogEntry, idx: number) => ( | ||
| <div | ||
| key={idx} | ||
| className="font-mono text-xs px-2 py-1 border-b border-border flex gap-2 items-baseline" | ||
| data-testid="log-entry" | ||
| > | ||
| {/* Timestamp */} | ||
| <span className="text-muted whitespace-nowrap"> | ||
| {new Date(entry.timestamp).toLocaleTimeString()} | ||
| </span> | ||
|
|
||
| {/* Level */} | ||
| <span | ||
| className={`font-semibold w-[44px] uppercase text-[11px] ${ | ||
| entry.level === "error" | ||
| ? "text-danger" | ||
| : entry.level === "warn" | ||
| ? "text-warn" | ||
| : "text-muted" | ||
| }`} | ||
| > | ||
| {entry.level} | ||
| </span> | ||
|
|
||
| {/* Source */} | ||
| <span className="text-muted w-16 overflow-hidden text-ellipsis whitespace-nowrap text-[11px]"> | ||
| [{entry.source}] | ||
| </span> | ||
|
|
||
| {/* Tag badges */} | ||
| <span className="inline-flex gap-0.5 shrink-0"> | ||
| {(entry.tags ?? []).map((t: string, ti: number) => { | ||
| const c = TAG_COLORS[t]; | ||
| return ( | ||
| <span | ||
| key={ti} | ||
| className="inline-block text-[10px] px-1.5 py-px rounded-lg mr-0.5" | ||
| style={{ | ||
| background: c ? c.bg : "var(--bg-muted)", | ||
| color: c ? c.fg : "var(--muted)", | ||
| fontFamily: "var(--font-body, sans-serif)", | ||
| }} | ||
| > | ||
| {t} | ||
| </span> | ||
| ); | ||
| })} | ||
| </span> | ||
|
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||
| {/* Message */} | ||
| <span className="flex-1 break-all">{entry.message}</span> | ||
| </div> | ||
| <LogRow key={idx} entry={entry} /> | ||
| )) |
There was a problem hiding this comment.
Using the array index idx as a key is not ideal for dynamic lists. When filters are applied, the log list changes, and using an index as a key can cause unnecessary re-renders, which partially undermines the performance optimization of this PR. A key should be stable and unique to each item across renders.
I suggest creating a composite key from the log entry's data. While a unique ID from the backend would be the best solution, a key composed of timestamp and message should be practically unique and stable.
| logs.map((entry: LogEntry, idx: number) => ( | |
| <div | |
| key={idx} | |
| className="font-mono text-xs px-2 py-1 border-b border-border flex gap-2 items-baseline" | |
| data-testid="log-entry" | |
| > | |
| {/* Timestamp */} | |
| <span className="text-muted whitespace-nowrap"> | |
| {new Date(entry.timestamp).toLocaleTimeString()} | |
| </span> | |
| {/* Level */} | |
| <span | |
| className={`font-semibold w-[44px] uppercase text-[11px] ${ | |
| entry.level === "error" | |
| ? "text-danger" | |
| : entry.level === "warn" | |
| ? "text-warn" | |
| : "text-muted" | |
| }`} | |
| > | |
| {entry.level} | |
| </span> | |
| {/* Source */} | |
| <span className="text-muted w-16 overflow-hidden text-ellipsis whitespace-nowrap text-[11px]"> | |
| [{entry.source}] | |
| </span> | |
| {/* Tag badges */} | |
| <span className="inline-flex gap-0.5 shrink-0"> | |
| {(entry.tags ?? []).map((t: string, ti: number) => { | |
| const c = TAG_COLORS[t]; | |
| return ( | |
| <span | |
| key={ti} | |
| className="inline-block text-[10px] px-1.5 py-px rounded-lg mr-0.5" | |
| style={{ | |
| background: c ? c.bg : "var(--bg-muted)", | |
| color: c ? c.fg : "var(--muted)", | |
| fontFamily: "var(--font-body, sans-serif)", | |
| }} | |
| > | |
| {t} | |
| </span> | |
| ); | |
| })} | |
| </span> | |
| {/* Message */} | |
| <span className="flex-1 break-all">{entry.message}</span> | |
| </div> | |
| <LogRow key={idx} entry={entry} /> | |
| )) | |
| logs.map((entry: LogEntry) => ( | |
| <LogRow key={`${entry.timestamp}-${entry.message}`} entry={entry} /> | |
| )) |
1 participant
⚡ Bolt: Optimized LogsView rendering
💡 What:
Extracted the inline log row rendering logic into a dedicated
LogRowcomponent and wrapped it withReact.memousing a custom equality check function.🎯 Why:
The
LogsViewcomponent receives a newlogsarray reference on every update (e.g., from polling or refresh), even if the content of the logs hasn't changed. This caused React to re-render every single row in the list unnecessarily.📊 Impact:
Prevents re-rendering of all log rows when the list updates but the content of existing rows remains the same. This is especially effective when polling for new logs, as existing logs will not be re-rendered.
🔬 Measurement:
Verified by code analysis that
React.memowith the customarePropsEqualfunction correctly identifies identical log entries (comparing timestamp, level, message, source, and deep-comparing tags) and skips re-rendering.PR created automatically by Jules for task 1638988380309307508 started by @Dexploarer