feat(omo-codex): wire Codex SessionStart telemetry for DAU/WAU/MAU

Adds a new Codex plugin component `telemetry` that emits a single
omo_codex_daily_active event (reason: session_start) from every Codex
SessionStart hook, with the same UTC-day deduplication, hashed
installation identifier, and four-flag opt-out as the install-time
event. Previously omo-codex telemetry only fired on install_completed,
so DAU/WAU/MAU under-reported real Codex usage.

- New plugin component packages/omo-codex/plugin/components/telemetry/
  mirrors the rules/comment-checker/lsp pattern: own src/, tsc build,
  vitest tests, package.json (posthog-node dep), hooks/hooks.json.
- src/codex-hook.ts wraps createPluginPostHog().trackActive(..., "session_start")
  with safeShutdown so Codex session startup never blocks on telemetry.
- Plugin root hooks.json + workspaces register the new component
  alongside rules and ultrawork on SessionStart.
- Aggregate test expectations updated to include the telemetry directory.
- cross-package-equivalence.test.ts pins product-identity constants and
  shouldDisablePostHog behavior to stay byte-equivalent between the CLI
  installer (src/telemetry/) and the plugin runtime
  (plugin/components/telemetry/src/), so the two PostHog sources never
  drift on event name, distinct_id base, dedup file path, or opt-out
  flags.
- PostHogActivityReason union in the CLI-side posthog.ts gains
  "session_start" so future CLI paths can emit the same reason without
  a type break.
This commit is contained in:
YeonGyu-Kim
2026-05-26 15:30:41 +09:00
parent b886ca9ca4
commit bd867019f9
22 changed files with 1128 additions and 3 deletions
@@ -0,0 +1,21 @@
import { renameSync, unlinkSync, writeFileSync } from "node:fs";
export function writeFileAtomically(filePath: string, content: string): void {
const tempPath = `${filePath}.tmp`;
writeFileSync(tempPath, content, "utf-8");
try {
renameSync(tempPath, filePath);
} catch (error) {
const isPermissionError =
error instanceof Error && (error.message.includes("EPERM") || error.message.includes("EACCES"));
if (process.platform === "win32" && isPermissionError) {
unlinkSync(filePath);
renameSync(tempPath, filePath);
return;
}
throw error;
}
}
@@ -0,0 +1,69 @@
#!/usr/bin/env node
import { stdin as processStdin, stdout as processStdout } from "node:process";
import { type CodexSessionStartInput, runSessionStartHook } from "./codex-hook.js";
const command = process.argv[2];
const subcommand = process.argv[3];
if (command === "hook" && subcommand === "session-start") {
await runHookCli();
} else {
process.stderr.write("Usage: codex-telemetry hook session-start\n");
process.exitCode = 1;
}
async function runHookCli(): Promise<void> {
const raw = await readStdin();
if (raw.trim().length === 0) return;
const parsed = parseHookInput(raw);
if (!isCodexSessionStartInput(parsed)) return;
const output = await runSessionStartHook(parsed);
if (output.length > 0) {
processStdout.write(output);
}
}
function parseHookInput(raw: string): unknown | undefined {
try {
const parsed: unknown = JSON.parse(raw);
return parsed;
} catch {
return undefined;
}
}
function isCodexSessionStartInput(value: unknown): value is CodexSessionStartInput {
return (
isRecord(value) &&
value["hook_event_name"] === "SessionStart" &&
typeof value["session_id"] === "string" &&
isStringOrNull(value["transcript_path"]) &&
typeof value["cwd"] === "string" &&
typeof value["model"] === "string" &&
typeof value["permission_mode"] === "string" &&
typeof value["source"] === "string"
);
}
function isStringOrNull(value: unknown): value is string | null {
return typeof value === "string" || value === null;
}
function isRecord(value: unknown): value is Record<string, unknown> {
return typeof value === "object" && value !== null && !Array.isArray(value);
}
function readStdin(): Promise<string> {
return new Promise((resolve, reject) => {
let data = "";
processStdin.setEncoding("utf8");
processStdin.on("data", (chunk: string) => {
data += chunk;
});
processStdin.once("error", reject);
processStdin.once("end", () => {
resolve(data);
});
});
}
@@ -0,0 +1,49 @@
import {
type PostHogActivityReason,
type PostHogClient,
createPluginPostHog,
getPostHogDistinctId,
} from "./posthog.js";
export type CodexSessionStartInput = {
session_id: string;
transcript_path: string | null;
cwd: string;
hook_event_name: "SessionStart";
model: string;
permission_mode: string;
source: "startup" | "resume" | "clear";
};
export type CodexTelemetryHookOptions = {
createClient?: () => PostHogClient;
getDistinctId?: () => string;
};
const SESSION_START_REASON: PostHogActivityReason = "session_start";
export async function runSessionStartHook(
_input: CodexSessionStartInput,
options: CodexTelemetryHookOptions = {},
): Promise<string> {
const createClient = options.createClient ?? createPluginPostHog;
const getDistinctId = options.getDistinctId ?? getPostHogDistinctId;
const client = createClient();
try {
client.trackActive(getDistinctId(), SESSION_START_REASON);
} catch {
await safeShutdown(client);
return "";
}
await safeShutdown(client);
return "";
}
async function safeShutdown(client: PostHogClient): Promise<void> {
try {
await client.shutdown();
} catch {
return;
}
}
@@ -0,0 +1,44 @@
import { accessSync, constants, mkdirSync } from "node:fs";
import os from "node:os";
import path from "node:path";
import { CACHE_DIR_NAME } from "./product-identity.js";
type OsProvider = Pick<typeof os, "homedir" | "tmpdir">;
let osProviderOverride: OsProvider | null = null;
export function getOsProvider(): OsProvider {
return osProviderOverride ?? os;
}
/** @internal test-only */
export function __setOsProviderForTesting(provider: OsProvider): void {
osProviderOverride = provider;
}
/** @internal test-only */
export function __resetOsProviderForTesting(): void {
osProviderOverride = null;
}
function resolveWritableDirectory(preferredDir: string, fallbackSuffix: string): string {
try {
mkdirSync(preferredDir, { recursive: true });
accessSync(preferredDir, constants.W_OK);
return preferredDir;
} catch {
const fallbackDir = path.join(getOsProvider().tmpdir(), fallbackSuffix);
mkdirSync(fallbackDir, { recursive: true });
return fallbackDir;
}
}
export function getDataDir(): string {
const preferredDataDir = process.env["XDG_DATA_HOME"] ?? path.join(getOsProvider().homedir(), ".local", "share");
return resolveWritableDirectory(preferredDataDir, "omo-codex-data");
}
export function getActivityStateDir(): string {
return path.join(getDataDir(), CACHE_DIR_NAME);
}
@@ -0,0 +1,40 @@
import { DEFAULT_POSTHOG_API_KEY, DEFAULT_POSTHOG_HOST } from "./product-identity.js";
function normalizeEnvValue(value: string | undefined): string | undefined {
return value?.trim().toLowerCase();
}
function isDisableFlag(value: string | undefined): boolean {
const normalized = normalizeEnvValue(value);
return normalized === "1" || normalized === "true";
}
function isTelemetryOptOutFlag(value: string | undefined): boolean {
const normalized = normalizeEnvValue(value);
return normalized === "0" || normalized === "false" || normalized === "no";
}
export function shouldDisablePostHog(): boolean {
return (
isDisableFlag(process.env["OMO_DISABLE_POSTHOG"]) ||
isTelemetryOptOutFlag(process.env["OMO_SEND_ANONYMOUS_TELEMETRY"]) ||
isDisableFlag(process.env["OMO_CODEX_DISABLE_POSTHOG"]) ||
isTelemetryOptOutFlag(process.env["OMO_CODEX_SEND_ANONYMOUS_TELEMETRY"])
);
}
export function getPostHogApiKey(): string {
const explicit = process.env["POSTHOG_API_KEY"];
if (explicit === undefined) {
return DEFAULT_POSTHOG_API_KEY;
}
return explicit.trim();
}
export function hasPostHogApiKey(): boolean {
return getPostHogApiKey().length > 0;
}
export function getPostHogHost(): string {
return process.env["POSTHOG_HOST"]?.trim() || DEFAULT_POSTHOG_HOST;
}
@@ -0,0 +1,79 @@
import { existsSync, mkdirSync, readFileSync } from "node:fs";
import { join } from "node:path";
import { writeFileAtomically } from "./atomic-write.js";
import { getActivityStateDir } from "./data-path.js";
export type PostHogActivityState = {
readonly lastActiveDayUTC?: string;
};
export type PostHogActivityCaptureState = {
readonly dayUTC: string;
readonly captureDaily: boolean;
};
const POSTHOG_ACTIVITY_STATE_FILE = "posthog-activity.json";
function getPostHogActivityStateFilePath(): string {
return join(getActivityStateDir(), POSTHOG_ACTIVITY_STATE_FILE);
}
function getUtcDayString(date: Date): string {
return date.toISOString().slice(0, 10);
}
function isPostHogActivityState(value: unknown): value is PostHogActivityState {
return value !== null && typeof value === "object" && !Array.isArray(value);
}
function readPostHogActivityState(): PostHogActivityState {
const stateFilePath = getPostHogActivityStateFilePath();
if (!existsSync(stateFilePath)) {
return {};
}
try {
const stateContent = readFileSync(stateFilePath, "utf-8");
const stateJson: unknown = JSON.parse(stateContent);
if (!isPostHogActivityState(stateJson)) {
return {};
}
return stateJson;
} catch {
return {};
}
}
function writePostHogActivityState(nextState: PostHogActivityState): void {
const stateDir = getActivityStateDir();
const stateFilePath = getPostHogActivityStateFilePath();
try {
mkdirSync(stateDir, { recursive: true });
writeFileAtomically(stateFilePath, `${JSON.stringify(nextState, null, 2)}\n`);
} catch {
return;
}
}
export function getPostHogActivityCaptureState(now: Date = new Date()): PostHogActivityCaptureState {
const state = readPostHogActivityState();
const dayUTC = getUtcDayString(now);
const captureDaily = state.lastActiveDayUTC !== dayUTC;
if (captureDaily) {
writePostHogActivityState({
...state,
lastActiveDayUTC: dayUTC,
});
}
return {
dayUTC,
captureDaily,
};
}
@@ -0,0 +1,156 @@
import { createHash } from "node:crypto";
import os from "node:os";
import { PostHog } from "posthog-node";
import { getPostHogApiKey, getPostHogHost, hasPostHogApiKey, shouldDisablePostHog } from "./env-flags.js";
import { getPostHogActivityCaptureState } from "./posthog-activity-state.js";
import {
DEFAULT_POSTHOG_API_KEY,
DEFAULT_POSTHOG_HOST,
EVENT_NAME,
PACKAGE_NAME,
PRODUCT_NAME,
getComponentVersion,
} from "./product-identity.js";
export { DEFAULT_POSTHOG_API_KEY, DEFAULT_POSTHOG_HOST };
export type PostHogActivityReason = "session_start";
export type PostHogClient = {
trackActive: (distinctId: string, reason: PostHogActivityReason) => void;
shutdown: () => Promise<void>;
};
type OsProvider = Pick<typeof os, "arch" | "cpus" | "hostname" | "platform" | "release" | "totalmem" | "type">;
type ActivityStateProvider = typeof getPostHogActivityCaptureState;
let osProviderOverride: OsProvider | null = null;
let activityStateProviderOverride: ActivityStateProvider | null = null;
const NO_OP_POSTHOG: PostHogClient = {
trackActive: () => undefined,
shutdown: async () => undefined,
};
type PostHogCaptureEvent = Parameters<PostHog["capture"]>[0];
function resolveOsProvider(): OsProvider {
return osProviderOverride ?? os;
}
function resolveActivityStateProvider(): ActivityStateProvider {
return activityStateProviderOverride ?? getPostHogActivityCaptureState;
}
function getSafeCpuInfo(): { readonly count: number; readonly model: string | undefined } {
try {
const cpuInfo = resolveOsProvider().cpus();
return {
count: cpuInfo.length,
model: cpuInfo[0]?.model,
};
} catch {
return {
count: 0,
model: undefined,
};
}
}
function getSharedProperties(): NonNullable<PostHogCaptureEvent["properties"]> {
const osProvider = resolveOsProvider();
const cpuInfo = getSafeCpuInfo();
return {
platform: "omo-codex",
product_name: PRODUCT_NAME,
package_name: PACKAGE_NAME,
package_version: getComponentVersion(),
runtime: "node",
runtime_version: process.version,
source: "plugin",
$os: osProvider.platform(),
$os_version: osProvider.release(),
os_arch: osProvider.arch(),
os_type: osProvider.type(),
cpu_count: cpuInfo.count,
cpu_model: cpuInfo.model,
total_memory_gb: Math.round(osProvider.totalmem() / 1024 / 1024 / 1024),
locale: Intl.DateTimeFormat().resolvedOptions().locale,
timezone: Intl.DateTimeFormat().resolvedOptions().timeZone,
shell: process.env["SHELL"],
ci: Boolean(process.env["CI"]),
terminal: process.env["TERM_PROGRAM"],
};
}
export function createPluginPostHog(): PostHogClient {
if (shouldDisablePostHog() || !hasPostHogApiKey()) {
return NO_OP_POSTHOG;
}
let client: PostHog;
try {
client = new PostHog(getPostHogApiKey(), {
enableExceptionAutocapture: false,
enableLocalEvaluation: false,
strictLocalEvaluation: true,
disableRemoteConfig: true,
flushAt: 1,
flushInterval: 0,
host: getPostHogHost(),
disableGeoip: false,
});
} catch {
return NO_OP_POSTHOG;
}
const sharedProperties = getSharedProperties();
return {
trackActive: (distinctId, reason) => {
const activityState = resolveActivityStateProvider()();
if (!activityState.captureDaily) {
return;
}
client.capture({
distinctId,
event: EVENT_NAME,
properties: {
...sharedProperties,
$process_person_profile: false,
day_utc: activityState.dayUTC,
reason,
},
});
},
shutdown: async () => client.shutdown(),
};
}
export function getPostHogDistinctId(): string {
return createHash("sha256").update(`omo-codex:${resolveOsProvider().hostname()}`).digest("hex");
}
/** @internal test-only */
export function __setOsProviderForTesting(provider: OsProvider): void {
osProviderOverride = provider;
}
/** @internal test-only */
export function __resetOsProviderForTesting(): void {
osProviderOverride = null;
}
/** @internal test-only */
export function __setActivityStateProviderForTesting(provider: ActivityStateProvider): void {
activityStateProviderOverride = provider;
}
/** @internal test-only */
export function __resetActivityStateProviderForTesting(): void {
activityStateProviderOverride = null;
}
@@ -0,0 +1,35 @@
import { readFileSync } from "node:fs";
export const PRODUCT_NAME = "omo-codex";
export const PACKAGE_NAME = "@oh-my-opencode/omo-codex";
export const CACHE_DIR_NAME = "omo-codex";
export const EVENT_NAME = "omo_codex_daily_active";
export const LEGACY_PARENT_PACKAGE = "oh-my-opencode";
export const DEFAULT_POSTHOG_HOST = "https://us.i.posthog.com";
export const DEFAULT_POSTHOG_API_KEY = "phc_CFJhj5HyvA62QPhvyaUCtaq23aUfznnijg5VaaGkNk74";
type ComponentPackageManifest = { readonly version?: string };
function isComponentPackageManifest(value: unknown): value is ComponentPackageManifest {
return value !== null && typeof value === "object" && !Array.isArray(value);
}
function readComponentVersionFromManifest(): string {
try {
const manifestUrl = new URL("../package.json", import.meta.url);
const manifestText = readFileSync(manifestUrl, "utf-8");
const parsed: unknown = JSON.parse(manifestText);
if (isComponentPackageManifest(parsed) && typeof parsed.version === "string") {
return parsed.version;
}
} catch {
return "0.0.0";
}
return "0.0.0";
}
const COMPONENT_VERSION_CACHE = readComponentVersionFromManifest();
export function getComponentVersion(): string {
return COMPONENT_VERSION_CACHE;
}