feat: Claude Code Monitor — lanes, pipelines and a merged workspace
Internal SmartGift build of a Claude Code monitoring dashboard. Lanes: a durable unit of parallel agent work, one per working directory, tracked across session restarts. Managed lanes are git worktrees the dashboard provisions and can reset or remove behind a three-check destroy guard and a counted preflight; adopted lanes are directories you already own and are never destroyable. Pipelines: a lane moves through pipeline stages. A stage the agent declares with evidence renders green; a stage inferred from the tool-event stream renders dashed amber and never counts as done. Detection is forward-only within a 30-minute window, and never writes the declared stage. Workspace: one page at /run with a lane grid, the selected lane's pipeline, and a full Claude console behind a disclosure.
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/**
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* @file Unit tests for the TranscriptCache class, which extracts token usage from Claude transcript JSONL files and caches results for performance. Tests cover cache hits/misses, compaction detection, multiple models, and edge cases like malformed files and eviction behavior.
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* @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
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*/
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const { describe, it, beforeEach, afterEach } = require("node:test");
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const assert = require("node:assert/strict");
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const fs = require("fs");
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const path = require("path");
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const os = require("os");
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let tmpDir;
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let TranscriptCache;
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function writeJsonl(filePath, entries) {
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fs.writeFileSync(filePath, entries.map((e) => JSON.stringify(e)).join("\n") + "\n");
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}
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describe("TranscriptCache", () => {
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beforeEach(() => {
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tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), "tc-test-"));
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delete require.cache[require.resolve("../../lib/transcript-cache")];
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TranscriptCache = require("../../lib/transcript-cache");
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});
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afterEach(() => {
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fs.rmSync(tmpDir, { recursive: true, force: true });
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});
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it("should extract tokens on first read (cache miss)", () => {
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const file = path.join(tmpDir, "session.jsonl");
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writeJsonl(file, [
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{
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message: {
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model: "claude-sonnet-4-20250514",
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usage: { input_tokens: 100, output_tokens: 50 },
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},
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},
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{
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message: {
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model: "claude-sonnet-4-20250514",
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usage: { input_tokens: 200, output_tokens: 75 },
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},
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},
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]);
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const cache = new TranscriptCache();
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const result = cache.extract(file);
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assert.deepStrictEqual(result.tokensByModel, {
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"claude-sonnet-4-20250514": { input: 300, output: 125, cacheRead: 0, cacheWrite: 0 },
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});
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assert.strictEqual(result.compaction, null);
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});
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it("should return cached result when file is unchanged", () => {
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const file = path.join(tmpDir, "session.jsonl");
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writeJsonl(file, [
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{
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message: {
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model: "claude-sonnet-4-20250514",
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usage: { input_tokens: 100, output_tokens: 50 },
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},
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},
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]);
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const cache = new TranscriptCache();
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const r1 = cache.extract(file);
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const r2 = cache.extract(file);
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assert.deepStrictEqual(r1, r2);
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// Same object reference proves cache hit (no re-parse)
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assert.strictEqual(r1, r2);
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});
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it("should detect new data when file grows", () => {
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const file = path.join(tmpDir, "session.jsonl");
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writeJsonl(file, [
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{
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message: {
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model: "claude-sonnet-4-20250514",
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usage: { input_tokens: 100, output_tokens: 50 },
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},
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},
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]);
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const cache = new TranscriptCache();
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const r1 = cache.extract(file);
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assert.strictEqual(r1.tokensByModel["claude-sonnet-4-20250514"].input, 100);
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// Append more data (simulates Claude writing to transcript)
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fs.appendFileSync(
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file,
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JSON.stringify({
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message: {
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model: "claude-sonnet-4-20250514",
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usage: { input_tokens: 200, output_tokens: 75 },
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},
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}) + "\n"
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);
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const r2 = cache.extract(file);
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assert.strictEqual(r2.tokensByModel["claude-sonnet-4-20250514"].input, 300);
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assert.strictEqual(r2.tokensByModel["claude-sonnet-4-20250514"].output, 125);
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});
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it("should do full re-read when file shrinks (compaction rewrite)", () => {
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const file = path.join(tmpDir, "session.jsonl");
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writeJsonl(file, [
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{
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message: {
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model: "claude-sonnet-4-20250514",
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usage: { input_tokens: 500, output_tokens: 200 },
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},
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},
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{
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message: {
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model: "claude-sonnet-4-20250514",
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usage: { input_tokens: 300, output_tokens: 100 },
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},
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},
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]);
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const cache = new TranscriptCache();
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cache.extract(file);
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// Simulate compaction — file is rewritten with fewer entries + summary
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writeJsonl(file, [
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{ isCompactSummary: true, uuid: "abc-123", timestamp: "2026-03-20T10:00:00Z" },
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{
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message: {
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model: "claude-sonnet-4-20250514",
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usage: { input_tokens: 50, output_tokens: 20 },
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},
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},
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]);
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const r2 = cache.extract(file);
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assert.strictEqual(r2.tokensByModel["claude-sonnet-4-20250514"].input, 50);
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assert.strictEqual(r2.compaction.count, 1);
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assert.strictEqual(r2.compaction.entries[0].uuid, "abc-123");
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});
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it("should return null for non-existent file", () => {
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const cache = new TranscriptCache();
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assert.strictEqual(cache.extract("/nonexistent/file.jsonl"), null);
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assert.strictEqual(cache.extract(null), null);
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assert.strictEqual(cache.extract(""), null);
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});
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it("should expose compaction entries via extractCompactions()", () => {
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const file = path.join(tmpDir, "session.jsonl");
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writeJsonl(file, [
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{
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message: {
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model: "claude-sonnet-4-20250514",
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usage: { input_tokens: 100, output_tokens: 50 },
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},
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},
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{ isCompactSummary: true, uuid: "c1", timestamp: "2026-03-20T09:00:00Z" },
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{
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message: {
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model: "claude-sonnet-4-20250514",
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usage: { input_tokens: 50, output_tokens: 20 },
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},
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},
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{ isCompactSummary: true, uuid: "c2", timestamp: "2026-03-20T10:00:00Z" },
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]);
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const cache = new TranscriptCache();
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const compactions = cache.extractCompactions(file);
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assert.strictEqual(compactions.length, 2);
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assert.strictEqual(compactions[0].uuid, "c1");
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assert.strictEqual(compactions[1].uuid, "c2");
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});
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it("should handle multiple models in same file", () => {
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const file = path.join(tmpDir, "session.jsonl");
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writeJsonl(file, [
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{
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message: {
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model: "claude-sonnet-4-20250514",
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usage: { input_tokens: 100, output_tokens: 50 },
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},
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},
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{
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message: {
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model: "claude-opus-4-20250514",
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usage: { input_tokens: 500, output_tokens: 200 },
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},
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},
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]);
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const cache = new TranscriptCache();
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const result = cache.extract(file);
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assert.strictEqual(result.tokensByModel["claude-sonnet-4-20250514"].input, 100);
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assert.strictEqual(result.tokensByModel["claude-opus-4-20250514"].input, 500);
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});
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it("should skip <synthetic> model entries", () => {
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const file = path.join(tmpDir, "session.jsonl");
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writeJsonl(file, [
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{ message: { model: "<synthetic>", usage: { input_tokens: 999, output_tokens: 999 } } },
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{
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message: {
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model: "claude-sonnet-4-20250514",
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usage: { input_tokens: 100, output_tokens: 50 },
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},
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},
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]);
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const cache = new TranscriptCache();
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const result = cache.extract(file);
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assert.strictEqual(Object.keys(result.tokensByModel).length, 1);
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assert.strictEqual(result.tokensByModel["claude-sonnet-4-20250514"].input, 100);
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});
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it("should handle cache_read and cache_write tokens", () => {
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const file = path.join(tmpDir, "session.jsonl");
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writeJsonl(file, [
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{
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message: {
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model: "claude-sonnet-4-20250514",
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usage: {
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input_tokens: 100,
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output_tokens: 50,
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cache_read_input_tokens: 30,
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cache_creation_input_tokens: 15,
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},
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},
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},
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]);
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const cache = new TranscriptCache();
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const result = cache.extract(file);
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assert.strictEqual(result.tokensByModel["claude-sonnet-4-20250514"].cacheRead, 30);
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assert.strictEqual(result.tokensByModel["claude-sonnet-4-20250514"].cacheWrite, 15);
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});
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it("should remove entry on invalidate()", () => {
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const file = path.join(tmpDir, "session.jsonl");
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writeJsonl(file, [
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{ message: { model: "m1", usage: { input_tokens: 100, output_tokens: 50 } } },
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]);
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const cache = new TranscriptCache();
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cache.extract(file);
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assert.strictEqual(cache.size, 1);
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cache.invalidate(file);
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assert.strictEqual(cache.size, 0);
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});
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it("should clear all entries", () => {
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const file1 = path.join(tmpDir, "s1.jsonl");
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const file2 = path.join(tmpDir, "s2.jsonl");
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writeJsonl(file1, [
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{ message: { model: "m1", usage: { input_tokens: 10, output_tokens: 5 } } },
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]);
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writeJsonl(file2, [
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{ message: { model: "m1", usage: { input_tokens: 20, output_tokens: 10 } } },
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]);
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const cache = new TranscriptCache();
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cache.extract(file1);
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cache.extract(file2);
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assert.strictEqual(cache.size, 2);
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cache.clear();
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assert.strictEqual(cache.size, 0);
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});
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it("should return correct stats()", () => {
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const file = path.join(tmpDir, "session.jsonl");
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writeJsonl(file, [{ message: { model: "m1", usage: { input_tokens: 10, output_tokens: 5 } } }]);
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const cache = new TranscriptCache();
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cache.extract(file);
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const stats = cache.stats();
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assert.strictEqual(stats.entries, 1);
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assert.strictEqual(stats.paths.length, 1);
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assert.strictEqual(stats.paths[0], file);
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});
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it("should only read new bytes on incremental update", () => {
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const file = path.join(tmpDir, "session.jsonl");
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const line1 =
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JSON.stringify({
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message: { model: "m1", usage: { input_tokens: 100, output_tokens: 50 } },
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}) + "\n";
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fs.writeFileSync(file, line1);
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const cache = new TranscriptCache();
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cache.extract(file);
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// Append a second line
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const line2 =
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JSON.stringify({
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message: { model: "m1", usage: { input_tokens: 200, output_tokens: 75 } },
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}) + "\n";
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fs.appendFileSync(file, line2);
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const r2 = cache.extract(file);
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assert.strictEqual(r2.tokensByModel["m1"].input, 300);
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// Verify bytesRead advanced to full file size
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const entry = cache._cache.get(file);
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assert.strictEqual(entry.bytesRead, Buffer.byteLength(line1 + line2, "utf8"));
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});
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it("should handle incremental read adding new compaction entries", () => {
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const file = path.join(tmpDir, "session.jsonl");
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writeJsonl(file, [
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{ message: { model: "m1", usage: { input_tokens: 100, output_tokens: 50 } } },
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]);
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const cache = new TranscriptCache();
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const r1 = cache.extract(file);
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assert.strictEqual(r1.compaction, null);
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// Append a compaction entry
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fs.appendFileSync(
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file,
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JSON.stringify({ isCompactSummary: true, uuid: "new-c", timestamp: "2026-03-20T12:00:00Z" }) +
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"\n"
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);
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const r2 = cache.extract(file);
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assert.strictEqual(r2.compaction.count, 1);
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assert.strictEqual(r2.compaction.entries[0].uuid, "new-c");
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});
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it("should return null for empty file", () => {
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const file = path.join(tmpDir, "empty.jsonl");
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fs.writeFileSync(file, "");
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const cache = new TranscriptCache();
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assert.strictEqual(cache.extract(file), null);
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});
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it("should skip malformed JSON lines gracefully", () => {
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const file = path.join(tmpDir, "session.jsonl");
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fs.writeFileSync(
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file,
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[
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"not valid json",
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JSON.stringify({
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message: { model: "m1", usage: { input_tokens: 100, output_tokens: 50 } },
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}),
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"{broken",
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].join("\n") + "\n"
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);
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const cache = new TranscriptCache();
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const result = cache.extract(file);
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assert.strictEqual(result.tokensByModel["m1"].input, 100);
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});
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it("should evict oldest entries when exceeding maxEntries", () => {
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const cache = new TranscriptCache(3); // max 3 entries
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const files = [];
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for (let i = 0; i < 5; i++) {
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const file = path.join(tmpDir, `s${i}.jsonl`);
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writeJsonl(file, [
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{ message: { model: "m1", usage: { input_tokens: i * 10, output_tokens: i * 5 } } },
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]);
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files.push(file);
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}
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// Fill cache with 5 entries, but max is 3
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for (const f of files) cache.extract(f);
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assert.strictEqual(cache.size, 3);
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// Oldest two (s0, s1) should be evicted; newest three (s2, s3, s4) remain
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const stats = cache.stats();
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assert.ok(!stats.paths.includes(files[0]), "oldest entry s0 should be evicted");
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assert.ok(!stats.paths.includes(files[1]), "second-oldest entry s1 should be evicted");
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assert.ok(stats.paths.includes(files[2]), "s2 should remain");
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assert.ok(stats.paths.includes(files[3]), "s3 should remain");
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assert.ok(stats.paths.includes(files[4]), "s4 should remain");
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});
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it("should refresh LRU order on access", () => {
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const cache = new TranscriptCache(3);
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const files = [];
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for (let i = 0; i < 3; i++) {
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const file = path.join(tmpDir, `lru${i}.jsonl`);
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writeJsonl(file, [
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{ message: { model: "m1", usage: { input_tokens: 10, output_tokens: 5 } } },
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]);
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files.push(file);
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cache.extract(file);
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}
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// Access file[0] again (moves it to most-recently-used)
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fs.appendFileSync(
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files[0],
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JSON.stringify({ message: { model: "m1", usage: { input_tokens: 5, output_tokens: 2 } } }) +
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"\n"
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);
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cache.extract(files[0]);
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// Add a new file — should evict file[1] (now the oldest), not file[0]
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const newFile = path.join(tmpDir, "lru_new.jsonl");
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writeJsonl(newFile, [
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{ message: { model: "m1", usage: { input_tokens: 1, output_tokens: 1 } } },
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]);
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cache.extract(newFile);
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assert.strictEqual(cache.size, 3);
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const stats = cache.stats();
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assert.ok(stats.paths.includes(files[0]), "recently accessed file should remain");
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assert.ok(!stats.paths.includes(files[1]), "oldest untouched file should be evicted");
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assert.ok(stats.paths.includes(files[2]), "file[2] should remain");
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assert.ok(stats.paths.includes(newFile), "new file should be present");
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});
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it("should return defensive copy from extractCompactions", () => {
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const file = path.join(tmpDir, "session.jsonl");
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writeJsonl(file, [
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{ isCompactSummary: true, uuid: "c1", timestamp: "2026-03-20T09:00:00Z" },
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||||
{ message: { model: "m1", usage: { input_tokens: 10, output_tokens: 5 } } },
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]);
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const cache = new TranscriptCache();
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const compactions = cache.extractCompactions(file);
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assert.strictEqual(compactions.length, 1);
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// Mutate returned array — should NOT affect cache
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compactions.push({ uuid: "fake", timestamp: null });
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compactions[0].uuid = "mutated";
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const compactions2 = cache.extractCompactions(file);
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assert.strictEqual(compactions2.length, 1);
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assert.strictEqual(compactions2[0].uuid, "c1");
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});
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it("should return empty array from extractCompactions for file with no compactions", () => {
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const file = path.join(tmpDir, "session.jsonl");
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writeJsonl(file, [{ message: { model: "m1", usage: { input_tokens: 10, output_tokens: 5 } } }]);
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const cache = new TranscriptCache();
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const compactions = cache.extractCompactions(file);
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assert.deepStrictEqual(compactions, []);
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});
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it("should return empty array from extractCompactions for non-existent file", () => {
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const cache = new TranscriptCache();
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||||
const compactions = cache.extractCompactions("/nonexistent.jsonl");
|
||||
assert.deepStrictEqual(compactions, []);
|
||||
});
|
||||
|
||||
it("should capture lastInterruptTs from an Esc-interrupt entry (text marker)", () => {
|
||||
const file = path.join(tmpDir, "session.jsonl");
|
||||
writeJsonl(file, [
|
||||
{ message: { model: "m1", usage: { input_tokens: 10, output_tokens: 5 } } },
|
||||
{
|
||||
type: "user",
|
||||
message: {
|
||||
role: "user",
|
||||
content: [{ type: "text", text: "[Request interrupted by user]" }],
|
||||
},
|
||||
timestamp: "2026-06-28T12:00:00.000Z",
|
||||
},
|
||||
]);
|
||||
|
||||
const cache = new TranscriptCache();
|
||||
const result = cache.extract(file);
|
||||
assert.strictEqual(result.lastInterruptTs, "2026-06-28T12:00:00.000Z");
|
||||
assert.strictEqual(result.pendingInterrupt, true);
|
||||
});
|
||||
|
||||
it("should capture lastInterruptTs via the interruptedMessageId field", () => {
|
||||
const file = path.join(tmpDir, "session.jsonl");
|
||||
writeJsonl(file, [
|
||||
{
|
||||
type: "user",
|
||||
interruptedMessageId: "msg_123",
|
||||
message: {
|
||||
role: "user",
|
||||
content: [{ type: "text", text: "[Request interrupted by user for tool use]" }],
|
||||
},
|
||||
timestamp: "2026-06-28T13:30:00.000Z",
|
||||
},
|
||||
]);
|
||||
|
||||
const cache = new TranscriptCache();
|
||||
const result = cache.extract(file);
|
||||
assert.strictEqual(result.lastInterruptTs, "2026-06-28T13:30:00.000Z");
|
||||
assert.strictEqual(result.pendingInterrupt, true);
|
||||
});
|
||||
|
||||
it("should flag pendingInterrupt for an Esc pressed BEFORE any output (prompt then interrupt)", () => {
|
||||
// The hard case: user submits, then cancels before the model emits anything.
|
||||
// Transcript order is [user prompt, interrupt] — no assistant entry between.
|
||||
const file = path.join(tmpDir, "session.jsonl");
|
||||
writeJsonl(file, [
|
||||
{
|
||||
type: "user",
|
||||
message: { role: "user", content: [{ type: "text", text: "do a big refactor" }] },
|
||||
timestamp: "2026-06-28T15:00:00.000Z",
|
||||
},
|
||||
{
|
||||
type: "user",
|
||||
interruptedMessageId: "m",
|
||||
message: {
|
||||
role: "user",
|
||||
content: [{ type: "text", text: "[Request interrupted by user]" }],
|
||||
},
|
||||
timestamp: "2026-06-28T15:00:00.001Z", // 1ms later — the real-world skew case
|
||||
},
|
||||
]);
|
||||
|
||||
const cache = new TranscriptCache();
|
||||
const result = cache.extract(file);
|
||||
assert.strictEqual(result.pendingInterrupt, true, "pre-output Esc must still be detected");
|
||||
});
|
||||
|
||||
it("should flag pendingInterrupt when Esc follows assistant output", () => {
|
||||
const file = path.join(tmpDir, "session.jsonl");
|
||||
writeJsonl(file, [
|
||||
{
|
||||
type: "assistant",
|
||||
message: { model: "m1", usage: { input_tokens: 10, output_tokens: 5 } },
|
||||
timestamp: "2026-06-28T16:00:00.000Z",
|
||||
},
|
||||
{
|
||||
type: "user",
|
||||
interruptedMessageId: "m",
|
||||
message: {
|
||||
role: "user",
|
||||
content: [{ type: "text", text: "[Request interrupted by user]" }],
|
||||
},
|
||||
timestamp: "2026-06-28T16:00:05.000Z",
|
||||
},
|
||||
]);
|
||||
|
||||
const cache = new TranscriptCache();
|
||||
const result = cache.extract(file);
|
||||
assert.strictEqual(result.pendingInterrupt, true);
|
||||
});
|
||||
|
||||
it("should NOT flag pendingInterrupt when the user resumed after the interrupt", () => {
|
||||
// [interrupt, new prompt] — the user came back and submitted again.
|
||||
const file = path.join(tmpDir, "session.jsonl");
|
||||
writeJsonl(file, [
|
||||
{
|
||||
type: "user",
|
||||
interruptedMessageId: "m",
|
||||
message: {
|
||||
role: "user",
|
||||
content: [{ type: "text", text: "[Request interrupted by user]" }],
|
||||
},
|
||||
timestamp: "2026-06-28T17:00:00.000Z",
|
||||
},
|
||||
{
|
||||
type: "user",
|
||||
message: { role: "user", content: [{ type: "text", text: "actually do this instead" }] },
|
||||
timestamp: "2026-06-28T17:00:30.000Z",
|
||||
},
|
||||
]);
|
||||
|
||||
const cache = new TranscriptCache();
|
||||
const result = cache.extract(file);
|
||||
assert.strictEqual(result.lastInterruptTs, "2026-06-28T17:00:00.000Z");
|
||||
assert.strictEqual(result.pendingInterrupt, false, "resuming with a new prompt clears it");
|
||||
});
|
||||
|
||||
it("should keep the latest interrupt timestamp (append-only, last wins)", () => {
|
||||
const file = path.join(tmpDir, "session.jsonl");
|
||||
writeJsonl(file, [
|
||||
{
|
||||
type: "user",
|
||||
interruptedMessageId: "a",
|
||||
message: {
|
||||
role: "user",
|
||||
content: [{ type: "text", text: "[Request interrupted by user]" }],
|
||||
},
|
||||
timestamp: "2026-06-28T10:00:00.000Z",
|
||||
},
|
||||
{
|
||||
type: "user",
|
||||
interruptedMessageId: "b",
|
||||
message: {
|
||||
role: "user",
|
||||
content: [{ type: "text", text: "[Request interrupted by user]" }],
|
||||
},
|
||||
timestamp: "2026-06-28T11:00:00.000Z",
|
||||
},
|
||||
]);
|
||||
|
||||
const cache = new TranscriptCache();
|
||||
const result = cache.extract(file);
|
||||
assert.strictEqual(result.lastInterruptTs, "2026-06-28T11:00:00.000Z");
|
||||
assert.strictEqual(result.pendingInterrupt, true);
|
||||
});
|
||||
|
||||
it("should carry a newer interrupt across an incremental read", () => {
|
||||
const file = path.join(tmpDir, "session.jsonl");
|
||||
writeJsonl(file, [{ message: { model: "m1", usage: { input_tokens: 10, output_tokens: 5 } } }]);
|
||||
|
||||
const cache = new TranscriptCache();
|
||||
const first = cache.extract(file);
|
||||
assert.strictEqual(first.lastInterruptTs, null);
|
||||
assert.strictEqual(first.pendingInterrupt, false);
|
||||
|
||||
// Append an interrupt entry → incremental read path must surface it.
|
||||
fs.appendFileSync(
|
||||
file,
|
||||
JSON.stringify({
|
||||
type: "user",
|
||||
interruptedMessageId: "x",
|
||||
message: {
|
||||
role: "user",
|
||||
content: [{ type: "text", text: "[Request interrupted by user]" }],
|
||||
},
|
||||
timestamp: "2026-06-28T14:00:00.000Z",
|
||||
}) + "\n"
|
||||
);
|
||||
const second = cache.extract(file);
|
||||
assert.strictEqual(second.lastInterruptTs, "2026-06-28T14:00:00.000Z");
|
||||
assert.strictEqual(second.pendingInterrupt, true);
|
||||
});
|
||||
|
||||
it("should clear pendingInterrupt across an incremental read when the user resumes", () => {
|
||||
// First read sees a tail interrupt; a later prompt appended in the next
|
||||
// chunk must flip pendingInterrupt back to false via the merge path.
|
||||
const file = path.join(tmpDir, "session.jsonl");
|
||||
writeJsonl(file, [
|
||||
{
|
||||
type: "user",
|
||||
interruptedMessageId: "x",
|
||||
message: {
|
||||
role: "user",
|
||||
content: [{ type: "text", text: "[Request interrupted by user]" }],
|
||||
},
|
||||
timestamp: "2026-06-28T18:00:00.000Z",
|
||||
},
|
||||
]);
|
||||
|
||||
const cache = new TranscriptCache();
|
||||
assert.strictEqual(cache.extract(file).pendingInterrupt, true);
|
||||
|
||||
fs.appendFileSync(
|
||||
file,
|
||||
JSON.stringify({
|
||||
type: "user",
|
||||
message: { role: "user", content: [{ type: "text", text: "resume" }] },
|
||||
timestamp: "2026-06-28T18:01:00.000Z",
|
||||
}) + "\n"
|
||||
);
|
||||
assert.strictEqual(cache.extract(file).pendingInterrupt, false, "incremental resume clears it");
|
||||
});
|
||||
|
||||
it("should leave lastInterruptTs null and pendingInterrupt false when there is no interrupt", () => {
|
||||
const file = path.join(tmpDir, "session.jsonl");
|
||||
writeJsonl(file, [{ message: { model: "m1", usage: { input_tokens: 10, output_tokens: 5 } } }]);
|
||||
|
||||
const cache = new TranscriptCache();
|
||||
const result = cache.extract(file);
|
||||
assert.strictEqual(result.lastInterruptTs, null);
|
||||
assert.strictEqual(result.pendingInterrupt, false);
|
||||
});
|
||||
});
|
||||
Reference in New Issue
Block a user