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refactor: optimize history endpoint — reuse buffer, extract readFileHead, use line iterator

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Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
arkon
2026-03-22 02:01:56 +01:00
co-authored by Claude Opus 4.6
parent e54d7badc4
commit 867a10d78a
1 changed files with 21 additions and 18 deletions
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src/web/routes/session-routes.ts
+21 -18
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@@ -965,7 +965,12 @@ export function registerSessionRoutes(
/** Extract the text of the first user message from a JSONL transcript head. */
function extractFirstUserPrompt(head: string): string | undefined {
const MAX_PROMPT_LEN = 120;
for (const line of head.split('\n')) {
// Iterate lines without allocating a full split array
let start = 0;
while (start < head.length) {
const end = head.indexOf('\n', start);
const line = end === -1 ? head.slice(start) : head.slice(start, end);
start = end === -1 ? head.length : end + 1;
if (!line.includes('"type":"user"')) continue;
try {
const entry = JSON.parse(line);
@@ -995,6 +1000,18 @@ export function registerSessionRoutes(
return undefined;
}
/** Read the first 16KB of a file for content sniffing. */
async function readFileHead(path: string, buf: Buffer): Promise<string | null> {
try {
const fd = await fs.open(path, 'r');
const { bytesRead } = await fd.read(buf, 0, buf.length, 0);
await fd.close();
return buf.toString('utf8', 0, bytesRead);
} catch {
return null;
}
}
app.get('/api/history/sessions', async () => {
const projectsDir = join(process.env.HOME || '/tmp', '.claude', 'projects');
const results: Array<{
@@ -1005,6 +1022,7 @@ export function registerSessionRoutes(
lastModified: string;
firstPrompt?: string;
}> = [];
const headBuf = Buffer.alloc(16384);
try {
const projectDirs = await fs.readdir(projectsDir);
@@ -1042,20 +1060,9 @@ export function registerSessionRoutes(
// no "user"/"assistant" messages and will fail claude --resume.
// Read first 16KB to check content and extract first user prompt.
let firstPrompt: string | undefined;
const readHead = async (): Promise<string | null> => {
try {
const fd = await fs.open(filePath, 'r');
const buf = Buffer.alloc(16384);
const { bytesRead } = await fd.read(buf, 0, 16384, 0);
await fd.close();
return buf.toString('utf8', 0, bytesRead);
} catch {
return null;
}
};
const head = await readFileHead(filePath, headBuf);
if (fileStat.size < 50000) {
const head = await readHead();
if (
!head ||
(!head.includes('"type":"user"') &&
@@ -1064,12 +1071,8 @@ export function registerSessionRoutes(
) {
continue; // No conversation content — skip
}
firstPrompt = extractFirstUserPrompt(head);
} else {
// Large files are almost certainly real conversations; still read head for prompt
const head = await readHead();
if (head) firstPrompt = extractFirstUserPrompt(head);
}
if (head) firstPrompt = extractFirstUserPrompt(head);
results.push({
sessionId,