Implement JSONL-first session discovery with tiered lookup
Rewrite session discovery to be filesystem-first, addressing the widespread bug where Claude Code's sessions-index.json files are unreliable (87 MB of unindexed sessions, 17% loss rate across all projects). Architecture: Three-tier metadata lookup Tier 1 - Index validation (instant): - Parse sessions-index.json into Map<sessionId, IndexEntry> - Validate entry.modified against actual file stat.mtimeMs - Use 1s tolerance to account for ISO string → filesystem mtime rounding - Trust content fields only (messageCount, summary, firstPrompt) - Timestamps always come from fs.stat, never from index Tier 2 - Persistent cache hit (instant): - Check MetadataCache by (filePath, mtimeMs, size) - If match, use cached metadata - Survives server restarts Tier 3 - Full JSONL parse (~5-50ms/file): - Call extractSessionMetadata() with shared parser helpers - Cache result for future lookups Key correctness guarantees: - All .jsonl files appear regardless of index state - SessionEntry timestamps always from fs.stat (list ordering never stale) - Message counts exact (shared helpers ensure parser parity) - Duration computed from JSONL timestamps, not index Performance: - Bounded concurrency: 32 concurrent operations per project - mapWithLimit() prevents file handle exhaustion - Warm start <1s (stat all files, in-memory lookups) - Cold start ~3-5s for 3,103 files (stat + parse phases) TOCTOU handling: - Files that disappear between readdir and stat: silently skipped - Files that disappear between stat and read: silently skipped - File actively being written: partial parse handled gracefully Include PRD document that drove this implementation with detailed requirements, edge cases, and verification plan. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
teernisse
@@ -1,70 +1,122 @@
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import { describe, it, expect } from "vitest";
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import { discoverSessions } from "../../src/server/services/session-discovery.js";
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import { describe, it, expect, beforeEach } from "vitest";
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import { discoverSessions, setCache } from "../../src/server/services/session-discovery.js";
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import { MetadataCache } from "../../src/server/services/metadata-cache.js";
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import path from "path";
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import fs from "fs/promises";
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import os from "os";
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/** Helper to write a sessions-index.json in the real { version, entries } format */
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function makeIndex(entries: Record<string, unknown>[]) {
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function makeJsonlContent(lines: Record<string, unknown>[]): string {
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return lines.map((l) => JSON.stringify(l)).join("\n");
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}
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function makeIndex(entries: Record<string, unknown>[]): string {
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return JSON.stringify({ version: 1, entries });
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}
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describe("session-discovery", () => {
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it("discovers sessions from { version, entries } format", async () => {
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const tmpDir = path.join(os.tmpdir(), `sv-test-${Date.now()}`);
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const projectDir = path.join(tmpDir, "test-project");
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await fs.mkdir(projectDir, { recursive: true });
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async function makeTmpProject(
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suffix: string
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): Promise<{ tmpDir: string; projectDir: string; cachePath: string; cleanup: () => Promise<void> }> {
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const tmpDir = path.join(os.tmpdir(), `sv-test-${suffix}-${Date.now()}`);
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const projectDir = path.join(tmpDir, "test-project");
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const cachePath = path.join(tmpDir, ".cache", "metadata.json");
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await fs.mkdir(projectDir, { recursive: true });
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return {
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tmpDir,
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projectDir,
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cachePath,
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cleanup: () => fs.rm(tmpDir, { recursive: true }),
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};
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}
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const sessionPath = path.join(projectDir, "sess-001.jsonl");
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await fs.writeFile(
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path.join(projectDir, "sessions-index.json"),
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makeIndex([
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{
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sessionId: "sess-001",
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fullPath: sessionPath,
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summary: "Test session",
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firstPrompt: "Hello",
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created: "2025-10-15T10:00:00Z",
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modified: "2025-10-15T11:00:00Z",
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messageCount: 5,
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describe("session-discovery", () => {
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beforeEach(() => {
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// Reset global cache between tests to prevent cross-contamination
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setCache(new MetadataCache(path.join(os.tmpdir(), `sv-cache-${Date.now()}.json`)));
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});
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it("discovers sessions from .jsonl files without index", async () => {
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const { tmpDir, projectDir, cleanup } = await makeTmpProject("no-index");
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const content = makeJsonlContent([
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{
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type: "user",
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message: { role: "user", content: "Hello world" },
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uuid: "u-1",
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timestamp: "2025-10-15T10:00:00Z",
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},
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{
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type: "assistant",
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message: {
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role: "assistant",
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content: [{ type: "text", text: "Hi there" }],
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},
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])
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);
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uuid: "a-1",
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timestamp: "2025-10-15T10:01:00Z",
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},
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]);
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await fs.writeFile(path.join(projectDir, "sess-001.jsonl"), content);
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const sessions = await discoverSessions(tmpDir);
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expect(sessions).toHaveLength(1);
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expect(sessions[0].id).toBe("sess-001");
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expect(sessions[0].summary).toBe("Test session");
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expect(sessions[0].project).toBe("test-project");
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expect(sessions[0].messageCount).toBe(5);
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expect(sessions[0].path).toBe(sessionPath);
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expect(sessions[0].messageCount).toBe(2);
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expect(sessions[0].firstPrompt).toBe("Hello world");
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expect(sessions[0].path).toBe(path.join(projectDir, "sess-001.jsonl"));
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await fs.rm(tmpDir, { recursive: true });
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await cleanup();
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});
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it("also handles legacy raw array format", async () => {
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const tmpDir = path.join(os.tmpdir(), `sv-test-legacy-${Date.now()}`);
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const projectDir = path.join(tmpDir, "legacy-project");
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await fs.mkdir(projectDir, { recursive: true });
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it("timestamps come from stat, not JSONL content", async () => {
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const { tmpDir, projectDir, cleanup } = await makeTmpProject("stat-times");
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// Raw array (not wrapped in { version, entries })
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await fs.writeFile(
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path.join(projectDir, "sessions-index.json"),
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JSON.stringify([
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{
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sessionId: "legacy-001",
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summary: "Legacy format",
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created: "2025-10-15T10:00:00Z",
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modified: "2025-10-15T11:00:00Z",
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},
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])
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);
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const content = makeJsonlContent([
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{
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type: "user",
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message: { role: "user", content: "Hello" },
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uuid: "u-1",
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timestamp: "2020-01-01T00:00:00Z",
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},
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]);
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const filePath = path.join(projectDir, "sess-stat.jsonl");
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await fs.writeFile(filePath, content);
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const sessions = await discoverSessions(tmpDir);
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expect(sessions).toHaveLength(1);
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expect(sessions[0].id).toBe("legacy-001");
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await fs.rm(tmpDir, { recursive: true });
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// created and modified should be from stat (recent), not from the 2020 timestamp
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const createdDate = new Date(sessions[0].created);
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const now = new Date();
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const diffMs = now.getTime() - createdDate.getTime();
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expect(diffMs).toBeLessThan(60_000); // within last minute
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await cleanup();
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});
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it("silently skips files deleted between readdir and stat", async () => {
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const { tmpDir, projectDir, cleanup } = await makeTmpProject("toctou");
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// Write a session, discover will find it
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const content = makeJsonlContent([
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{
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type: "user",
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message: { role: "user", content: "Survives" },
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uuid: "u-1",
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},
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]);
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await fs.writeFile(path.join(projectDir, "survivor.jsonl"), content);
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// Write and immediately delete another
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await fs.writeFile(path.join(projectDir, "ghost.jsonl"), content);
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await fs.unlink(path.join(projectDir, "ghost.jsonl"));
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const sessions = await discoverSessions(tmpDir);
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expect(sessions).toHaveLength(1);
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expect(sessions[0].id).toBe("survivor");
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await cleanup();
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});
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it("handles missing projects directory gracefully", async () => {
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@@ -72,21 +124,6 @@ describe("session-discovery", () => {
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expect(sessions).toEqual([]);
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});
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it("handles corrupt index files gracefully", async () => {
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const tmpDir = path.join(os.tmpdir(), `sv-test-corrupt-${Date.now()}`);
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const projectDir = path.join(tmpDir, "corrupt-project");
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await fs.mkdir(projectDir, { recursive: true });
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await fs.writeFile(
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path.join(projectDir, "sessions-index.json"),
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"not valid json {"
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);
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const sessions = await discoverSessions(tmpDir);
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expect(sessions).toEqual([]);
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await fs.rm(tmpDir, { recursive: true });
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});
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it("aggregates across multiple project directories", async () => {
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const tmpDir = path.join(os.tmpdir(), `sv-test-multi-${Date.now()}`);
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const proj1 = path.join(tmpDir, "project-a");
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@@ -94,14 +131,25 @@ describe("session-discovery", () => {
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await fs.mkdir(proj1, { recursive: true });
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await fs.mkdir(proj2, { recursive: true });
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await fs.writeFile(
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path.join(proj1, "sessions-index.json"),
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makeIndex([{ sessionId: "a-001", created: "2025-01-01T00:00:00Z", modified: "2025-01-01T00:00:00Z" }])
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);
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await fs.writeFile(
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path.join(proj2, "sessions-index.json"),
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makeIndex([{ sessionId: "b-001", created: "2025-01-02T00:00:00Z", modified: "2025-01-02T00:00:00Z" }])
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);
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const contentA = makeJsonlContent([
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{
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type: "user",
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message: { role: "user", content: "Project A" },
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uuid: "u-a",
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timestamp: "2025-01-01T00:00:00Z",
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},
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]);
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const contentB = makeJsonlContent([
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{
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type: "user",
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message: { role: "user", content: "Project B" },
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uuid: "u-b",
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timestamp: "2025-01-02T00:00:00Z",
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},
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]);
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await fs.writeFile(path.join(proj1, "a-001.jsonl"), contentA);
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await fs.writeFile(path.join(proj2, "b-001.jsonl"), contentB);
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const sessions = await discoverSessions(tmpDir);
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expect(sessions).toHaveLength(2);
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@@ -112,93 +160,299 @@ describe("session-discovery", () => {
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await fs.rm(tmpDir, { recursive: true });
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});
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it("rejects paths with traversal segments", async () => {
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const tmpDir = path.join(os.tmpdir(), `sv-test-traversal-${Date.now()}`);
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const projectDir = path.join(tmpDir, "traversal-project");
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await fs.mkdir(projectDir, { recursive: true });
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it("ignores non-.jsonl files in project directories", async () => {
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const { tmpDir, projectDir, cleanup } = await makeTmpProject("filter-ext");
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const goodPath = path.join(projectDir, "good-001.jsonl");
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const content = makeJsonlContent([
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{
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type: "user",
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message: { role: "user", content: "Hello" },
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uuid: "u-1",
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},
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]);
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await fs.writeFile(path.join(projectDir, "session.jsonl"), content);
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await fs.writeFile(
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path.join(projectDir, "sessions-index.json"),
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makeIndex([
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{
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sessionId: "evil-001",
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fullPath: "/home/ubuntu/../../../etc/passwd",
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created: "2025-10-15T10:00:00Z",
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modified: "2025-10-15T11:00:00Z",
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},
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{
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sessionId: "evil-002",
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fullPath: "/home/ubuntu/sessions/not-a-jsonl.txt",
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created: "2025-10-15T10:00:00Z",
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modified: "2025-10-15T11:00:00Z",
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},
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{
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sessionId: "good-001",
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fullPath: goodPath,
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created: "2025-10-15T10:00:00Z",
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modified: "2025-10-15T11:00:00Z",
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},
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])
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'{"version":1,"entries":[]}'
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);
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await fs.writeFile(path.join(projectDir, "notes.txt"), "notes");
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const sessions = await discoverSessions(tmpDir);
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expect(sessions).toHaveLength(1);
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expect(sessions[0].id).toBe("good-001");
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expect(sessions[0].id).toBe("session");
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await fs.rm(tmpDir, { recursive: true });
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await cleanup();
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});
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it("rejects absolute paths outside the projects directory", async () => {
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const tmpDir = path.join(os.tmpdir(), `sv-test-containment-${Date.now()}`);
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const projectDir = path.join(tmpDir, "contained-project");
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await fs.mkdir(projectDir, { recursive: true });
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it("duration computed from JSONL timestamps", async () => {
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const { tmpDir, projectDir, cleanup } = await makeTmpProject("duration");
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await fs.writeFile(
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path.join(projectDir, "sessions-index.json"),
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makeIndex([
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{
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sessionId: "escaped-001",
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fullPath: "/etc/shadow.jsonl",
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created: "2025-10-15T10:00:00Z",
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modified: "2025-10-15T11:00:00Z",
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const content = makeJsonlContent([
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{
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type: "user",
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message: { role: "user", content: "Start" },
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uuid: "u-1",
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timestamp: "2025-10-15T10:00:00Z",
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},
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{
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type: "assistant",
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message: {
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role: "assistant",
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content: [{ type: "text", text: "End" }],
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},
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{
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sessionId: "escaped-002",
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fullPath: "/tmp/other-dir/secret.jsonl",
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created: "2025-10-15T10:00:00Z",
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modified: "2025-10-15T11:00:00Z",
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},
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])
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);
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uuid: "a-1",
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timestamp: "2025-10-15T10:30:00Z",
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},
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]);
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await fs.writeFile(path.join(projectDir, "sess-dur.jsonl"), content);
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const sessions = await discoverSessions(tmpDir);
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expect(sessions).toHaveLength(0);
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expect(sessions).toHaveLength(1);
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// 30 minutes = 1800000 ms
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expect(sessions[0].duration).toBe(1_800_000);
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await fs.rm(tmpDir, { recursive: true });
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await cleanup();
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});
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it("uses fullPath from index entry", async () => {
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const tmpDir = path.join(os.tmpdir(), `sv-test-fp-${Date.now()}`);
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const projectDir = path.join(tmpDir, "fp-project");
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await fs.mkdir(projectDir, { recursive: true });
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it("handles empty .jsonl files", async () => {
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const { tmpDir, projectDir, cleanup } = await makeTmpProject("empty");
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const sessionPath = path.join(projectDir, "fp-001.jsonl");
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await fs.writeFile(
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path.join(projectDir, "sessions-index.json"),
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makeIndex([
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{
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sessionId: "fp-001",
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fullPath: sessionPath,
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created: "2025-10-15T10:00:00Z",
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modified: "2025-10-15T11:00:00Z",
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},
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])
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);
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await fs.writeFile(path.join(projectDir, "empty.jsonl"), "");
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const sessions = await discoverSessions(tmpDir);
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expect(sessions[0].path).toBe(sessionPath);
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expect(sessions).toHaveLength(1);
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expect(sessions[0].id).toBe("empty");
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expect(sessions[0].messageCount).toBe(0);
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expect(sessions[0].firstPrompt).toBe("");
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await fs.rm(tmpDir, { recursive: true });
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await cleanup();
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});
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it("sorts by modified descending", async () => {
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const { tmpDir, projectDir, cleanup } = await makeTmpProject("sort");
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const content1 = makeJsonlContent([
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{
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type: "user",
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message: { role: "user", content: "First" },
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uuid: "u-1",
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},
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]);
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const content2 = makeJsonlContent([
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{
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type: "user",
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message: { role: "user", content: "Second" },
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uuid: "u-2",
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},
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]);
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await fs.writeFile(path.join(projectDir, "older.jsonl"), content1);
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// Small delay to ensure different mtime
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await new Promise((r) => setTimeout(r, 50));
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await fs.writeFile(path.join(projectDir, "newer.jsonl"), content2);
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const sessions = await discoverSessions(tmpDir);
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expect(sessions).toHaveLength(2);
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expect(sessions[0].id).toBe("newer");
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expect(sessions[1].id).toBe("older");
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await cleanup();
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});
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describe("Tier 1 index validation", () => {
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it("uses index data when modified matches stat mtime within 1s", async () => {
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const { tmpDir, projectDir, cleanup } = await makeTmpProject("tier1-hit");
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const content = makeJsonlContent([
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{
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type: "user",
|
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message: { role: "user", content: "Hello" },
|
||||
uuid: "u-1",
|
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timestamp: "2025-10-15T10:00:00Z",
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},
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||||
]);
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const filePath = path.join(projectDir, "sess-idx.jsonl");
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await fs.writeFile(filePath, content);
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// Get the actual mtime from the file
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const stat = await fs.stat(filePath);
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const mtimeIso = new Date(stat.mtimeMs).toISOString();
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// Write an index with the matching modified timestamp and different metadata
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await fs.writeFile(
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path.join(projectDir, "sessions-index.json"),
|
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makeIndex([
|
||||
{
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||||
sessionId: "sess-idx",
|
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summary: "Index summary",
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firstPrompt: "Index prompt",
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messageCount: 99,
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modified: mtimeIso,
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||||
created: "2025-10-15T09:00:00Z",
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},
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||||
])
|
||||
);
|
||||
|
||||
const sessions = await discoverSessions(tmpDir);
|
||||
expect(sessions).toHaveLength(1);
|
||||
// Should use index data (Tier 1 hit)
|
||||
expect(sessions[0].messageCount).toBe(99);
|
||||
expect(sessions[0].summary).toBe("Index summary");
|
||||
expect(sessions[0].firstPrompt).toBe("Index prompt");
|
||||
|
||||
await cleanup();
|
||||
});
|
||||
|
||||
it("rejects index data when mtime mismatch > 1s", async () => {
|
||||
const { tmpDir, projectDir, cleanup } = await makeTmpProject("tier1-miss");
|
||||
|
||||
const content = makeJsonlContent([
|
||||
{
|
||||
type: "user",
|
||||
message: { role: "user", content: "Real content" },
|
||||
uuid: "u-1",
|
||||
timestamp: "2025-10-15T10:00:00Z",
|
||||
},
|
||||
]);
|
||||
await fs.writeFile(path.join(projectDir, "sess-stale.jsonl"), content);
|
||||
|
||||
// Write an index with a very old modified timestamp (stale)
|
||||
await fs.writeFile(
|
||||
path.join(projectDir, "sessions-index.json"),
|
||||
makeIndex([
|
||||
{
|
||||
sessionId: "sess-stale",
|
||||
summary: "Stale index summary",
|
||||
firstPrompt: "Stale prompt",
|
||||
messageCount: 99,
|
||||
modified: "2020-01-01T00:00:00Z",
|
||||
created: "2020-01-01T00:00:00Z",
|
||||
},
|
||||
])
|
||||
);
|
||||
|
||||
const sessions = await discoverSessions(tmpDir);
|
||||
expect(sessions).toHaveLength(1);
|
||||
// Should NOT use index data (Tier 1 miss) — falls through to Tier 3
|
||||
expect(sessions[0].messageCount).toBe(1); // Actual parse count
|
||||
expect(sessions[0].firstPrompt).toBe("Real content");
|
||||
|
||||
await cleanup();
|
||||
});
|
||||
|
||||
it("skips Tier 1 when entry has no modified field", async () => {
|
||||
const { tmpDir, projectDir, cleanup } = await makeTmpProject("tier1-no-mod");
|
||||
|
||||
const content = makeJsonlContent([
|
||||
{
|
||||
type: "user",
|
||||
message: { role: "user", content: "Real content" },
|
||||
uuid: "u-1",
|
||||
},
|
||||
]);
|
||||
await fs.writeFile(path.join(projectDir, "sess-nomod.jsonl"), content);
|
||||
|
||||
await fs.writeFile(
|
||||
path.join(projectDir, "sessions-index.json"),
|
||||
makeIndex([
|
||||
{
|
||||
sessionId: "sess-nomod",
|
||||
summary: "Index summary",
|
||||
messageCount: 99,
|
||||
// No modified field
|
||||
},
|
||||
])
|
||||
);
|
||||
|
||||
const sessions = await discoverSessions(tmpDir);
|
||||
expect(sessions).toHaveLength(1);
|
||||
// Falls through to Tier 3 parse
|
||||
expect(sessions[0].messageCount).toBe(1);
|
||||
|
||||
await cleanup();
|
||||
});
|
||||
|
||||
it("handles missing sessions-index.json", async () => {
|
||||
const { tmpDir, projectDir, cleanup } = await makeTmpProject("tier1-missing");
|
||||
|
||||
const content = makeJsonlContent([
|
||||
{
|
||||
type: "user",
|
||||
message: { role: "user", content: "No index" },
|
||||
uuid: "u-1",
|
||||
},
|
||||
]);
|
||||
await fs.writeFile(path.join(projectDir, "sess-noindex.jsonl"), content);
|
||||
|
||||
const sessions = await discoverSessions(tmpDir);
|
||||
expect(sessions).toHaveLength(1);
|
||||
expect(sessions[0].firstPrompt).toBe("No index");
|
||||
|
||||
await cleanup();
|
||||
});
|
||||
|
||||
it("handles corrupt sessions-index.json", async () => {
|
||||
const { tmpDir, projectDir, cleanup } = await makeTmpProject("tier1-corrupt");
|
||||
|
||||
const content = makeJsonlContent([
|
||||
{
|
||||
type: "user",
|
||||
message: { role: "user", content: "Corrupt index" },
|
||||
uuid: "u-1",
|
||||
},
|
||||
]);
|
||||
await fs.writeFile(path.join(projectDir, "sess-corrupt.jsonl"), content);
|
||||
await fs.writeFile(
|
||||
path.join(projectDir, "sessions-index.json"),
|
||||
"not valid json {"
|
||||
);
|
||||
|
||||
const sessions = await discoverSessions(tmpDir);
|
||||
expect(sessions).toHaveLength(1);
|
||||
expect(sessions[0].firstPrompt).toBe("Corrupt index");
|
||||
|
||||
await cleanup();
|
||||
});
|
||||
|
||||
it("timestamps always from stat even on Tier 1 hit", async () => {
|
||||
const { tmpDir, projectDir, cleanup } = await makeTmpProject("tier1-stat-ts");
|
||||
|
||||
const content = makeJsonlContent([
|
||||
{
|
||||
type: "user",
|
||||
message: { role: "user", content: "Hello" },
|
||||
uuid: "u-1",
|
||||
},
|
||||
]);
|
||||
const filePath = path.join(projectDir, "sess-ts.jsonl");
|
||||
await fs.writeFile(filePath, content);
|
||||
|
||||
const stat = await fs.stat(filePath);
|
||||
const mtimeIso = new Date(stat.mtimeMs).toISOString();
|
||||
|
||||
await fs.writeFile(
|
||||
path.join(projectDir, "sessions-index.json"),
|
||||
makeIndex([
|
||||
{
|
||||
sessionId: "sess-ts",
|
||||
messageCount: 1,
|
||||
modified: mtimeIso,
|
||||
created: "1990-01-01T00:00:00Z",
|
||||
},
|
||||
])
|
||||
);
|
||||
|
||||
const sessions = await discoverSessions(tmpDir);
|
||||
expect(sessions).toHaveLength(1);
|
||||
|
||||
// created/modified should be from stat (recent), not from index's 1990 date
|
||||
const createdDate = new Date(sessions[0].created);
|
||||
const now = new Date();
|
||||
expect(now.getTime() - createdDate.getTime()).toBeLessThan(60_000);
|
||||
|
||||
await cleanup();
|
||||
});
|
||||
});
|
||||
});
|
||||
|
||||
Reference in New Issue
Block a user