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refactor(gateway): dedupe transcript tail preview

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This commit is contained in:
Peter Steinberger
2026-02-16 02:21:39 +00:00
parent 60ad2c2e96
commit dc9808a674
1 changed files with 34 additions and 51 deletions
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85
src/gateway/session-utils.fs.ts
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@@ -306,32 +306,7 @@ export function readSessionTitleFieldsFromTranscript(
// Tail (last message preview)
let lastMessagePreview: string | null = null;
try {
const readStart = Math.max(0, size - LAST_MSG_MAX_BYTES);
const readLen = Math.min(size, LAST_MSG_MAX_BYTES);
const buf = Buffer.alloc(readLen);
fs.readSync(fd, buf, 0, readLen, readStart);
const chunk = buf.toString("utf-8");
const lines = chunk.split(/\r?\n/).filter((l) => l.trim());
const tailLines = lines.slice(-LAST_MSG_MAX_LINES);
for (let i = tailLines.length - 1; i >= 0; i--) {
const line = tailLines[i];
try {
const parsed = JSON.parse(line);
const msg = parsed?.message as TranscriptMessage | undefined;
if (msg?.role !== "user" && msg?.role !== "assistant") {
continue;
}
const text = extractTextFromContent(msg.content);
if (text) {
lastMessagePreview = text;
break;
}
} catch {
// skip malformed
}
}
lastMessagePreview = readLastMessagePreviewFromOpenTranscript({ fd, size });
} catch {
// ignore tail read errors
}
@@ -430,6 +405,38 @@ export function readFirstUserMessageFromTranscript(
const LAST_MSG_MAX_BYTES = 16384;
const LAST_MSG_MAX_LINES = 20;
function readLastMessagePreviewFromOpenTranscript(params: {
fd: number;
size: number;
}): string | null {
const readStart = Math.max(0, params.size - LAST_MSG_MAX_BYTES);
const readLen = Math.min(params.size, LAST_MSG_MAX_BYTES);
const buf = Buffer.alloc(readLen);
fs.readSync(params.fd, buf, 0, readLen, readStart);
const chunk = buf.toString("utf-8");
const lines = chunk.split(/\r?\n/).filter((l) => l.trim());
const tailLines = lines.slice(-LAST_MSG_MAX_LINES);
for (let i = tailLines.length - 1; i >= 0; i--) {
const line = tailLines[i];
try {
const parsed = JSON.parse(line);
const msg = parsed?.message as TranscriptMessage | undefined;
if (msg?.role !== "user" && msg?.role !== "assistant") {
continue;
}
const text = extractTextFromContent(msg.content);
if (text) {
return text;
}
} catch {
// skip malformed
}
}
return null;
}
export function readLastMessagePreviewFromTranscript(
sessionId: string,
storePath: string | undefined,
@@ -450,31 +457,7 @@ export function readLastMessagePreviewFromTranscript(
if (size === 0) {
return null;
}
const readStart = Math.max(0, size - LAST_MSG_MAX_BYTES);
const readLen = Math.min(size, LAST_MSG_MAX_BYTES);
const buf = Buffer.alloc(readLen);
fs.readSync(fd, buf, 0, readLen, readStart);
const chunk = buf.toString("utf-8");
const lines = chunk.split(/\r?\n/).filter((l) => l.trim());
const tailLines = lines.slice(-LAST_MSG_MAX_LINES);
for (let i = tailLines.length - 1; i >= 0; i--) {
const line = tailLines[i];
try {
const parsed = JSON.parse(line);
const msg = parsed?.message as TranscriptMessage | undefined;
if (msg?.role === "user" || msg?.role === "assistant") {
const text = extractTextFromContent(msg.content);
if (text) {
return text;
}
}
} catch {
// skip malformed
}
}
return readLastMessagePreviewFromOpenTranscript({ fd, size });
} catch {
// file error
} finally {