feat(cli): add PostHog telemetry and source tracking to Python & Node CLIs (#4699)

cli/node/src/telemetry.ts

@@ -0,0 +1,101 @@
+/**
+ * CLI telemetry — anonymous usage tracking via PostHog.
+ *
+ * Sends fire-and-forget events by spawning a detached child process
+ * (telemetry-sender.cjs). The parent CLI process exits immediately;
+ * the child handles email resolution, caching, and the HTTP POST.
+ *
+ * Disable with: MEM0_TELEMETRY=false
+ */
+
+import { spawn } from "node:child_process";
+import { createHash } from "node:crypto";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import { CONFIG_FILE, loadConfig } from "./config.js";
+import { CLI_VERSION } from "./version.js";
+
+const POSTHOG_API_KEY = "phc_hgJkUVJFYtmaJqrvf6CYN67TIQ8yhXAkWzUn9AMU4yX";
+const POSTHOG_HOST = "https://us.i.posthog.com/i/v0/e/";
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const SENDER_SCRIPT = path.join(__dirname, "..", "telemetry-sender.cjs");
+
+function isTelemetryEnabled(): boolean {
+	try {
+		return process.env.MEM0_TELEMETRY !== "false";
+	} catch {
+		return true;
+	}
+}
+
+/**
+ * Return a stable anonymous identifier for the current user.
+ *
+ * Priority: cached user_email (from /v1/ping/) > MD5(api_key) > fallback.
+ * Matches the SDK pattern in mem0-ts/src/client/mem0.ts.
+ */
+function getDistinctId(): string {
+	try {
+		const config = loadConfig();
+		if (config.platform.userEmail) {
+			return config.platform.userEmail;
+		}
+		if (config.platform.apiKey) {
+			return createHash("md5").update(config.platform.apiKey).digest("hex");
+		}
+	} catch {
+		/* ignore */
+	}
+	return "anonymous-cli";
+}
+
+/**
+ * Fire a PostHog event (non-blocking, returns void, never throws).
+ * Spawns telemetry-sender.cjs as a detached subprocess.
+ */
+export function captureEvent(
+	eventName: string,
+	properties: Record<string, unknown> = {},
+): void {
+	if (!isTelemetryEnabled()) return;
+
+	try {
+		const config = loadConfig();
+		const distinctId = getDistinctId();
+
+		const payload = {
+			api_key: POSTHOG_API_KEY,
+			distinct_id: distinctId,
+			event: eventName,
+			properties: {
+				source: "CLI",
+				language: "node",
+				cli_version: CLI_VERSION,
+				node_version: process.version,
+				os: process.platform,
+				...properties,
+				$process_person_profile: false,
+				$lib: "posthog-node",
+			},
+		};
+
+		const context = {
+			payload,
+			posthogHost: POSTHOG_HOST,
+			needsEmail: !distinctId || !distinctId.includes("@"),
+			mem0ApiKey: config.platform.apiKey || "",
+			mem0BaseUrl: config.platform.baseUrl || "https://api.mem0.ai",
+			configPath: CONFIG_FILE,
+		};
+
+		const child = spawn(
+			process.execPath,
+			[SENDER_SCRIPT, JSON.stringify(context)],
+			{ detached: true, stdio: "ignore" },
+		);
+		child.unref();
+	} catch {
+		/* silently swallow */
+	}
+}