From a3c89a324ad37b92d11dc72d10141303c2701a45 Mon Sep 17 00:00:00 2001 From: slacki-ai Date: Tue, 17 Mar 2026 06:16:27 -0400 Subject: [PATCH 1/2] Attach error stack and log tail to Slack on crash MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit When ClaudeX catches an error (e.g. "Claude Code process exited with code 1"), the error handler now posts two additional file attachments to the same Slack thread: - error-stack.txt — the full JavaScript Error stack trace - service-logs.txt — the last 10 000 lines of the active service log This makes crashes self-diagnosing directly in Slack without requiring manual log inspection. New file: src/util/log-reader.ts - getLatestLogFile() — finds the newest service_*.log in logs/ - readLastNLines() — reads the last N lines from a file Modified: src/slack/files.ts - uploadContentAsFile() — writes a string to a tmp file and uploads it to Slack, then cleans up the tmp dir Modified: src/slack/events.ts - Error handler now calls both helpers after posting the error text Co-Authored-By: Claude Sonnet 4.6 --- src/slack/events.ts | 24 +++++++++++++++++++++++- src/slack/files.ts | 33 ++++++++++++++++++++++++++++++++- src/util/log-reader.ts | 36 ++++++++++++++++++++++++++++++++++++ 3 files changed, 91 insertions(+), 2 deletions(-) create mode 100644 src/util/log-reader.ts diff --git a/src/slack/events.ts b/src/slack/events.ts index 82b731a..8ae5cdf 100644 --- a/src/slack/events.ts +++ b/src/slack/events.ts @@ -6,7 +6,8 @@ import { DEFAULT_INACTIVITY_TIMEOUT_MS } from "../claude/response.js"; import { activeTimeouts } from "./tools.js"; import { resolveCwd } from "../util/paths.js"; import { detectFilePaths } from "../util/file-detect.js"; -import { downloadSlackFile, uploadFileToSlack } from "./files.js"; +import { downloadSlackFile, uploadFileToSlack, uploadContentAsFile } from "./files.js"; +import { getLatestLogFile, readLastNLines } from "../util/log-reader.js"; import { postToThread, formatForSlack } from "./messages.js"; import { createSlackMcpServer } from "./mcp-server.js"; import { basename } from "node:path"; @@ -217,6 +218,27 @@ export async function handleMessage( } catch { // If we can't even post the error, just log it } + + // Upload full stack trace as a text file + try { + const stack = err instanceof Error + ? (err.stack ?? err.message) + : String(err); + await uploadContentAsFile(client, channelId, threadTs, stack, "error-stack.txt"); + } catch { + // Best effort + } + + // Upload last 10 000 lines of the service log as a text file + try { + const logFile = getLatestLogFile(); + if (logFile) { + const logTail = readLastNLines(logFile, 10000); + await uploadContentAsFile(client, channelId, threadTs, logTail, "service-logs.txt"); + } + } catch { + // Best effort + } } finally { activeThreads.delete(threadKey); activeTimeouts.delete(threadKey); diff --git a/src/slack/files.ts b/src/slack/files.ts index 53d8110..831cec2 100644 --- a/src/slack/files.ts +++ b/src/slack/files.ts @@ -1,4 +1,4 @@ -import { mkdirSync, createWriteStream } from "node:fs"; +import { mkdirSync, createWriteStream, writeFileSync, rmSync } from "node:fs"; import { join } from "node:path"; import { randomUUID } from "node:crypto"; import { pipeline } from "node:stream/promises"; @@ -48,3 +48,34 @@ export async function uploadFileToSlack( filename, }); } + +/** + * Upload a string as a text file to a Slack thread. + * Writes to a temp file, uploads, then cleans up. + */ +export async function uploadContentAsFile( + client: WebClient, + channelId: string, + threadTs: string, + content: string, + filename: string, +): Promise { + const dir = join("/tmp", randomUUID()); + mkdirSync(dir, { recursive: true }); + const tmpPath = join(dir, filename); + writeFileSync(tmpPath, content, "utf-8"); + try { + await client.filesUploadV2({ + channel_id: channelId, + thread_ts: threadTs, + file: tmpPath, + filename, + }); + } finally { + try { + rmSync(dir, { recursive: true }); + } catch { + // Best effort cleanup + } + } +} diff --git a/src/util/log-reader.ts b/src/util/log-reader.ts new file mode 100644 index 0000000..1a823d0 --- /dev/null +++ b/src/util/log-reader.ts @@ -0,0 +1,36 @@ +import { readdirSync, readFileSync, statSync } from "node:fs"; +import { join } from "node:path"; + +/** + * Find the most recently modified service log file in the logs/ directory. + * Returns null if no log files are found. + */ +export function getLatestLogFile(): string | null { + const logsDir = join(process.cwd(), "logs"); + try { + const files = readdirSync(logsDir) + .filter((f) => f.startsWith("service_") && f.endsWith(".log")) + .map((f) => { + const fullPath = join(logsDir, f); + return { path: fullPath, mtime: statSync(fullPath).mtimeMs }; + }) + .sort((a, b) => b.mtime - a.mtime); + return files.length > 0 ? files[0].path : null; + } catch { + return null; + } +} + +/** + * Read the last N lines from a text file. + * Returns an error string if the file cannot be read. + */ +export function readLastNLines(filePath: string, n: number): string { + try { + const content = readFileSync(filePath, "utf-8"); + const lines = content.split("\n"); + return lines.slice(Math.max(0, lines.length - n)).join("\n"); + } catch (err) { + return `[Failed to read log file: ${err instanceof Error ? err.message : String(err)}]`; + } +} From d829e2b44e41b5fb32216c11b1c636e9b483a383 Mon Sep 17 00:00:00 2001 From: slacki-ai Date: Tue, 17 Mar 2026 07:06:26 -0400 Subject: [PATCH 2/2] Add unit tests for log-reader and uploadContentAsFile Sets up Vitest (first test infrastructure in the repo) and adds 19 tests covering the two new utilities introduced in the previous commit: src/util/log-reader.test.ts (12 tests) getLatestLogFile: - returns null for empty / missing logs directory - ignores files that don't match service_*.log - returns the single log file when only one exists - returns the most recently modified file among multiple candidates - handles three files and picks the newest readLastNLines: - returns error string for non-existent file - returns full content when file has fewer lines than requested - returns exactly the last N lines - handles empty file, n=1, n=0, and trailing-newline edge cases src/slack/files.test.ts (7 tests) uploadContentAsFile: - calls filesUploadV2 with the correct channel, thread, and filename - verifies the temp file is cleaned up after a successful upload - verifies the temp file is cleaned up even when filesUploadV2 throws - uploads empty string without error - uploads a 10 000-line string (simulating a log tail) without error - preserves the exact filename argument Co-Authored-By: Claude Sonnet 4.6 --- package-lock.json | 1253 ++++++++++++++++++++++++++++++++++- package.json | 7 +- src/slack/files.test.ts | 93 +++ src/util/log-reader.test.ts | 153 +++++ 4 files changed, 1493 insertions(+), 13 deletions(-) create mode 100644 src/slack/files.test.ts create mode 100644 src/util/log-reader.test.ts diff --git a/package-lock.json b/package-lock.json index 3ceb2d4..9d46b19 100644 --- a/package-lock.json +++ b/package-lock.json @@ -15,7 +15,8 @@ "devDependencies": { "@types/node": "^22.0.0", "tsx": "^4.19.0", - "typescript": "^5.7.0" + "typescript": "^5.7.0", + "vitest": "^4.1.0" } }, "node_modules/@anthropic-ai/claude-agent-sdk": { @@ -41,6 +42,40 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"https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz", diff --git a/package.json b/package.json index f3b5594..1d72bd5 100644 --- a/package.json +++ b/package.json @@ -5,7 +5,9 @@ "scripts": { "build": "tsc", "dev": "tsx --env-file=.env src/index.ts", - "start": "node --env-file=.env dist/index.js" + "start": "node --env-file=.env dist/index.js", + "test": "vitest run", + "test:watch": "vitest" }, "dependencies": { "@anthropic-ai/claude-agent-sdk": "^0.2.0", @@ -15,6 +17,7 @@ "devDependencies": { "@types/node": "^22.0.0", "tsx": "^4.19.0", - "typescript": "^5.7.0" + "typescript": "^5.7.0", + "vitest": "^4.1.0" } } diff --git a/src/slack/files.test.ts b/src/slack/files.test.ts new file mode 100644 index 0000000..f3c4b90 --- /dev/null +++ b/src/slack/files.test.ts @@ -0,0 +1,93 @@ +import { describe, it, expect, vi, beforeEach, afterEach } from "vitest"; +import { existsSync, mkdirSync, rmSync } from "node:fs"; +import { join } from "node:path"; +import { tmpdir } from "node:os"; +import { randomUUID } from "node:crypto"; +import type { WebClient } from "@slack/web-api"; +import { uploadContentAsFile } from "./files.js"; + +// --------------------------------------------------------------------------- +// Helpers +// --------------------------------------------------------------------------- + +function makeMockClient(overrides?: Partial): WebClient { + return { + filesUploadV2: vi.fn().mockResolvedValue({ ok: true }), + ...overrides, + } as unknown as WebClient; +} + +// --------------------------------------------------------------------------- +// uploadContentAsFile +// --------------------------------------------------------------------------- + +describe("uploadContentAsFile", () => { + it("calls filesUploadV2 with the correct channel, thread, and filename", async () => { + const client = makeMockClient(); + await uploadContentAsFile(client, "C123", "9999.0", "hello world", "error-stack.txt"); + + expect(client.filesUploadV2).toHaveBeenCalledOnce(); + const call = vi.mocked(client.filesUploadV2).mock.calls[0][0]; + expect(call.channel_id).toBe("C123"); + expect(call.thread_ts).toBe("9999.0"); + expect(call.filename).toBe("error-stack.txt"); + }); + + it("writes the content to the temp file that is uploaded", async () => { + let capturedFilePath: string | undefined; + const client = { + filesUploadV2: vi.fn().mockImplementation(async (args: { file?: string }) => { + capturedFilePath = args.file; + return { ok: true }; + }), + } as unknown as WebClient; + + await uploadContentAsFile(client, "C123", "9999.0", "the stack trace", "error-stack.txt"); + + // The temp file should have been cleaned up by now + expect(capturedFilePath).toBeDefined(); + expect(existsSync(capturedFilePath!)).toBe(false); + }); + + it("cleans up the temp directory even when filesUploadV2 throws", async () => { + let capturedFilePath: string | undefined; + const client = { + filesUploadV2: vi.fn().mockImplementation(async (args: { file?: string }) => { + capturedFilePath = args.file; + throw new Error("Slack API error"); + }), + } as unknown as WebClient; + + await expect( + uploadContentAsFile(client, "C123", "9999.0", "content", "error-stack.txt"), + ).rejects.toThrow("Slack API error"); + + // Temp dir containing the file should be gone + expect(capturedFilePath).toBeDefined(); + expect(existsSync(capturedFilePath!)).toBe(false); + }); + + it("uploads an empty string without error", async () => { + const client = makeMockClient(); + await expect( + uploadContentAsFile(client, "C123", "9999.0", "", "empty.txt"), + ).resolves.toBeUndefined(); + expect(client.filesUploadV2).toHaveBeenCalledOnce(); + }); + + it("uploads a large string (simulating a log tail) without error", async () => { + const client = makeMockClient(); + const bigContent = Array.from({ length: 10_000 }, (_, i) => `log line ${i}`).join("\n"); + await expect( + uploadContentAsFile(client, "C123", "9999.0", bigContent, "service-logs.txt"), + ).resolves.toBeUndefined(); + expect(client.filesUploadV2).toHaveBeenCalledOnce(); + }); + + it("preserves the exact filename passed to it", async () => { + const client = makeMockClient(); + await uploadContentAsFile(client, "C123", "9999.0", "x", "service-logs.txt"); + const call = vi.mocked(client.filesUploadV2).mock.calls[0][0]; + expect(call.filename).toBe("service-logs.txt"); + }); +}); diff --git a/src/util/log-reader.test.ts b/src/util/log-reader.test.ts new file mode 100644 index 0000000..3d24bf5 --- /dev/null +++ b/src/util/log-reader.test.ts @@ -0,0 +1,153 @@ +import { describe, it, expect, beforeEach, afterEach, vi } from "vitest"; +import { mkdirSync, writeFileSync, rmSync, utimesSync } from "node:fs"; +import { join } from "node:path"; +import { tmpdir } from "node:os"; +import { randomUUID } from "node:crypto"; +import { getLatestLogFile, readLastNLines } from "./log-reader.js"; + +// --------------------------------------------------------------------------- +// Helpers +// --------------------------------------------------------------------------- + +function makeTmpDir(): string { + const dir = join(tmpdir(), `claudex-test-${randomUUID()}`); + mkdirSync(dir, { recursive: true }); + return dir; +} + +function touch(filePath: string, content = "", mtimeMs?: number): void { + writeFileSync(filePath, content, "utf-8"); + if (mtimeMs !== undefined) { + const t = new Date(mtimeMs); + utimesSync(filePath, t, t); + } +} + +// --------------------------------------------------------------------------- +// getLatestLogFile +// --------------------------------------------------------------------------- + +describe("getLatestLogFile", () => { + let tmpDir: string; + + beforeEach(() => { + tmpDir = makeTmpDir(); + // getLatestLogFile reads from join(process.cwd(), "logs"), + // so we make process.cwd() return our temp dir and create a logs/ sub-dir. + mkdirSync(join(tmpDir, "logs"), { recursive: true }); + vi.spyOn(process, "cwd").mockReturnValue(tmpDir); + }); + + afterEach(() => { + vi.restoreAllMocks(); + rmSync(tmpDir, { recursive: true, force: true }); + }); + + it("returns null when the logs directory is empty", () => { + expect(getLatestLogFile()).toBeNull(); + }); + + it("returns null when the logs directory does not exist", () => { + rmSync(join(tmpDir, "logs"), { recursive: true }); + expect(getLatestLogFile()).toBeNull(); + }); + + it("ignores files that do not match service_*.log pattern", () => { + touch(join(tmpDir, "logs", "other.log")); + touch(join(tmpDir, "logs", "service_notes.txt")); + expect(getLatestLogFile()).toBeNull(); + }); + + it("returns the single log file when only one exists", () => { + const logPath = join(tmpDir, "logs", "service_20260101_120000.log"); + touch(logPath, "hello"); + expect(getLatestLogFile()).toBe(logPath); + }); + + it("returns the most recently modified log file", () => { + const logsDir = join(tmpDir, "logs"); + const older = join(logsDir, "service_20260101_120000.log"); + const newer = join(logsDir, "service_20260102_120000.log"); + + // Write older file first with an explicitly older mtime + touch(older, "old content", Date.now() - 10_000); + touch(newer, "new content", Date.now()); + + expect(getLatestLogFile()).toBe(newer); + }); + + it("handles three log files and picks the newest", () => { + const logsDir = join(tmpDir, "logs"); + const now = Date.now(); + touch(join(logsDir, "service_A.log"), "A", now - 20_000); + touch(join(logsDir, "service_B.log"), "B", now - 10_000); + const newest = join(logsDir, "service_C.log"); + touch(newest, "C", now); + + expect(getLatestLogFile()).toBe(newest); + }); +}); + +// --------------------------------------------------------------------------- +// readLastNLines +// --------------------------------------------------------------------------- + +describe("readLastNLines", () => { + let tmpDir: string; + + beforeEach(() => { + tmpDir = makeTmpDir(); + }); + + afterEach(() => { + rmSync(tmpDir, { recursive: true, force: true }); + }); + + it("returns an error string when the file does not exist", () => { + const result = readLastNLines(join(tmpDir, "nonexistent.log"), 10); + expect(result).toMatch(/Failed to read log file/); + }); + + it("returns the full file content when it has fewer lines than requested", () => { + const file = join(tmpDir, "test.log"); + writeFileSync(file, "line1\nline2\nline3", "utf-8"); + expect(readLastNLines(file, 10)).toBe("line1\nline2\nline3"); + }); + + it("returns exactly the last N lines", () => { + const file = join(tmpDir, "test.log"); + const lines = Array.from({ length: 20 }, (_, i) => `line${i + 1}`); + writeFileSync(file, lines.join("\n"), "utf-8"); + + const result = readLastNLines(file, 5); + expect(result).toBe("line16\nline17\nline18\nline19\nline20"); + }); + + it("returns empty string for an empty file", () => { + const file = join(tmpDir, "empty.log"); + writeFileSync(file, "", "utf-8"); + expect(readLastNLines(file, 10)).toBe(""); + }); + + it("handles n=1 correctly", () => { + const file = join(tmpDir, "test.log"); + writeFileSync(file, "first\nsecond\nthird", "utf-8"); + expect(readLastNLines(file, 1)).toBe("third"); + }); + + it("handles n=0 correctly (returns empty string)", () => { + const file = join(tmpDir, "test.log"); + writeFileSync(file, "first\nsecond", "utf-8"); + // slice(lines.length - 0) = slice(lines.length) = empty array + expect(readLastNLines(file, 0)).toBe(""); + }); + + it("preserves trailing newline behaviour", () => { + // A file ending with \n will have an empty string as the last split element. + const file = join(tmpDir, "test.log"); + writeFileSync(file, "line1\nline2\n", "utf-8"); + const result = readLastNLines(file, 2); + // last 2 of ["line1", "line2", ""] → "line2\n" joined + expect(result).toBe("line2\n"); + }); +});