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ReactNativeLDClient,
type LDOptions,
type LDContext,
AutoEnvAttributes,
} from "@launchdarkly/react-native-client-sdk";
import { LAUNCHDARKLY_ERROR_CODES } from "@repo/constants/error";
import { LAUNCHDARKLY_ERROR_MESSAGES } from "@repo/constants/messages";
import { createLaunchDarklyError } from "./errors";
import {
createAnonymousContext,
createUserContext,
isSameUser,
} from "./helpers";
import type { LaunchDarklyUser } from "./types";
type FlagChangeHandler = (flagKey: string, newValue: unknown) => void;
export class LaunchDarklyService {
private client: ReactNativeLDClient | null = null;
private isInitialized = false;
private initPromise: Promise<void> | null = null;
private clientSideId: string | undefined;
private mobileKey: string | undefined;
private currentContext: LDContext | null = null;
private hasClientSideId = false;
private flagChangeListeners: Map<string, Set<FlagChangeHandler>> = new Map();
private globalChangeHandler:
| ((context: LDContext, changedKeys: string[]) => void)
| null = null;
async initHostApp(clientSideId?: string) {
// Return early if already initialized or initialization in progress
if ((this.isInitialized && this.client) || this.initPromise) {
return this.initPromise || Promise.resolve();
}
this.initPromise = this._doInit(clientSideId);
return this.initPromise;
}
private async _doInit(clientSideId?: string): Promise<void> {
this.clientSideId = clientSideId || process.env.LAUNCHDARKLY_CLIENT_SIDE_ID;
this.mobileKey = process.env.LAUNCHDARKLY_MOBILE_KEY || this.clientSideId;
if (!this.mobileKey) {
this.hasClientSideId = false;
this.isInitialized = true;
this.initPromise = null;
return;
}
this.hasClientSideId = true;
try {
const defaultContext = createAnonymousContext();
this.currentContext = defaultContext;
this.client = new ReactNativeLDClient(
this.mobileKey,
AutoEnvAttributes.Enabled,
this._createOptions(),
);
// Don't await - let it connect in background
this.client.identify(defaultContext).catch(() => {
// Non-blocking error, connection will retry
});
this._setupGlobalChangeHandler();
this.isInitialized = true;
this.initPromise = null;
} catch (error) {
this._resetState();
throw createLaunchDarklyError(
LAUNCHDARKLY_ERROR_CODES.INIT_FAILED,
LAUNCHDARKLY_ERROR_MESSAGES.INIT_FAILED,
error,
);
}
}
async identify(user: LaunchDarklyUser) {
if (!this.hasClientSideId) {
return;
}
await this._waitForInitIfNeeded();
if (!this.client || !this.isInitialized) {
throw createLaunchDarklyError(
LAUNCHDARKLY_ERROR_CODES.CLIENT_NOT_INITIALIZED,
LAUNCHDARKLY_ERROR_MESSAGES.CLIENT_NOT_INITIALIZED,
);
}
try {
const context = createUserContext(user);
if (isSameUser(this.currentContext, context)) {
return;
}
await this.client.identify(context);
this.currentContext = context;
this._setupGlobalChangeHandler();
} catch (error) {
throw createLaunchDarklyError(
LAUNCHDARKLY_ERROR_CODES.IDENTIFY_FAILED,
LAUNCHDARKLY_ERROR_MESSAGES.IDENTIFY_FAILED,
error,
);
}
}
private async _ensureInitialized(): Promise<boolean> {
await this._waitForInitIfNeeded();
if (!this.hasClientSideId) return false;
if (this.client === null) return false;
if (!this.isInitialized) return false;
return true;
}
private async _waitForInitIfNeeded(): Promise<void> {
if (this.initPromise && !this.isInitialized) {
try {
await this.initPromise;
} catch {
// Ignore init errors
}
}
}
async boolVariation(
flagKey: string,
defaultValue: boolean,
): Promise<boolean> {
return this._getVariation(flagKey, defaultValue, (key, defaultVal) =>
this.client!.boolVariation(key, defaultVal),
);
}
async stringVariation(
flagKey: string,
defaultValue: string,
): Promise<string> {
return this._getVariation(flagKey, defaultValue, (key, defaultVal) =>
this.client!.stringVariation(key, defaultVal),
);
}
async numberVariation(
flagKey: string,
defaultValue: number,
): Promise<number> {
return this._getVariation(flagKey, defaultValue, (key, defaultVal) =>
this.client!.numberVariation(key, defaultVal),
);
}
async jsonVariation<T>(flagKey: string, defaultValue: T): Promise<T> {
return this._getVariation(
flagKey,
defaultValue,
(key, defaultVal) => this.client!.jsonVariation(key, defaultVal) as T,
);
}
private async _getVariation<T>(
flagKey: string,
defaultValue: T,
variationMethod: (key: string, defaultVal: T) => T,
): Promise<T> {
if (!(await this._ensureInitialized())) {
return defaultValue;
}
try {
return variationMethod(flagKey, defaultValue);
} catch {
return defaultValue;
}
}
private _createOptions(): LDOptions {
return {
withReasons: true,
};
}
isReady(): boolean {
return this.isInitialized && this.client !== null;
}
async waitForReady(timeout: number = 5000): Promise<void> {
if (this.isReady()) {
return;
}
if (this.initPromise) {
let timeoutId: NodeJS.Timeout;
const timeoutPromise = new Promise<never>((_, reject) => {
timeoutId = setTimeout(
() => reject(new Error("LaunchDarkly initialization timeout")),
timeout,
);
});
try {
await Promise.race([this.initPromise, timeoutPromise]);
} finally {
clearTimeout(timeoutId!);
}
}
if (!this.isReady()) {
throw new Error("LaunchDarkly client is not ready");
}
}
async track(eventName: string, data?: Record<string, unknown>) {
if (!this.hasClientSideId) {
return;
}
if (!(await this._ensureInitialized())) {
throw createLaunchDarklyError(
LAUNCHDARKLY_ERROR_CODES.CLIENT_NOT_INITIALIZED,
LAUNCHDARKLY_ERROR_MESSAGES.CLIENT_NOT_INITIALIZED,
);
}
try {
await this.client!.track(eventName, data);
} catch (error) {
throw createLaunchDarklyError(
LAUNCHDARKLY_ERROR_CODES.TRACK_FAILED,
`${LAUNCHDARKLY_ERROR_MESSAGES.TRACK_FAILED}: ${eventName}`,
error,
);
}
}
async flush() {
if (!this.client || !this.isInitialized) {
return;
}
try {
await this.client.flush();
} catch (error) {
throw createLaunchDarklyError(
LAUNCHDARKLY_ERROR_CODES.FLUSH_FAILED,
LAUNCHDARKLY_ERROR_MESSAGES.FLUSH_FAILED,
error,
);
}
}
async close() {
if (!this.client) {
return;
}
try {
this.removeAllFlagChangeListeners();
await this.client.close();
this._resetState();
} catch (error) {
throw createLaunchDarklyError(
LAUNCHDARKLY_ERROR_CODES.CLOSE_FAILED,
LAUNCHDARKLY_ERROR_MESSAGES.CLOSE_FAILED,
error,
);
}
}
async clearUser() {
if (!this.hasClientSideId) {
return;
}
await this._waitForInitIfNeeded();
if (!this.client || !this.isInitialized) {
return;
}
try {
const anonymousContext = createAnonymousContext();
await this.client.identify(anonymousContext);
this.currentContext = anonymousContext;
this._setupGlobalChangeHandler();
} catch (error) {
throw createLaunchDarklyError(
LAUNCHDARKLY_ERROR_CODES.CLEAR_USER_FAILED,
LAUNCHDARKLY_ERROR_MESSAGES.CLEAR_USER_FAILED,
error,
);
}
}
onFlagChange(flagKey: string, handler: FlagChangeHandler): () => void {
if (!this.flagChangeListeners.has(flagKey)) {
this.flagChangeListeners.set(flagKey, new Set());
}
this.flagChangeListeners.get(flagKey)!.add(handler);
this._setupGlobalChangeHandler();
return () => {
const listeners = this.flagChangeListeners.get(flagKey);
if (listeners) {
listeners.delete(handler);
if (listeners.size === 0) {
this.flagChangeListeners.delete(flagKey);
}
}
};
}
private _setupGlobalChangeHandler(): void {
if (!this.client || !this.isInitialized) {
return;
}
if (this.globalChangeHandler) {
try {
this.client.off("change", this.globalChangeHandler);
} catch {
// Non-critical
}
}
this.globalChangeHandler = (_context: LDContext, changedKeys: string[]) => {
for (const flagKey of changedKeys) {
const listeners = this.flagChangeListeners.get(flagKey);
if (listeners?.size) {
listeners.forEach((handler) => {
try {
handler(flagKey, undefined);
} catch (error) {
console.error(
`[LaunchDarkly] Error in flag change handler for ${flagKey}:`,
error,
);
}
});
}
}
};
try {
this.client.on("change", this.globalChangeHandler);
} catch (error) {
console.error(
"[LaunchDarkly] Failed to register change listener:",
error,
);
this.globalChangeHandler = null;
}
}
removeAllFlagChangeListeners(): void {
this.flagChangeListeners.clear();
if (this.client && this.globalChangeHandler) {
try {
this.client.off("change", this.globalChangeHandler);
} catch {
// Non-critical
}
this.globalChangeHandler = null;
}
}
private _resetState(): void {
this.client = null;
this.currentContext = null;
this.isInitialized = false;
this.hasClientSideId = false;
this.initPromise = null;
}
}
export const launchdarklyService = new LaunchDarklyService();
export default launchdarklyService;
|