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SdkConfig,
LogLevel,
ApiResponse,
Flag,
ErrorCallback,
userKey,
LSMessage,
ILSUser,
Title,
flagChangedCallback,
Switch,
Flags,
Property,
ILightSwitch,
} from './types';
import { LSLogger } from './LSLogger';
import {
getRequest,
postRequest,
getHashedPercentageForObjectIds,
compareObjectsAndMaps,
} from './utils';
import ReconnectingEventSource from 'reconnecting-eventsource';
import LSUser from './LSUser';
import { LSFlagNotFoundError, LSServerError, LSTypeCastError } from './error';
const logger = LSLogger(LogLevel.DEBUG);
const FLAG_NOT_FOUND = 1000;
const VARIATION_NOT_FOUND = 1001;
const MEMBER_NOT_FOUND = 2000;
const SDK_KEY_ALREADY_EXISTS = 3000;
const SDK_KEY_NOT_FOUND = 3001;
class LightSwitch implements ILightSwitch {
private static instance: LightSwitch | null = null;
public static isInitialized = false;
private constructor() {}
public static getInstance(): LightSwitch {
if (!LightSwitch.instance) {
LightSwitch.instance = new LightSwitch();
}
return LightSwitch.instance;
}
private sdkKey = '';
private logLevel = LogLevel.DEBUG; // 로그 레벨
// private lastUpdated = ''; // feature flag 데이터 갱신 날짜
private flags: Flags = new Map<string, Flag>();
private onError: null | ErrorCallback = null;
private eventSource: null | ReconnectingEventSource = null;
private onFlagChanged: null | flagChangedCallback = null;
private userKey = '';
private reconnectTime = 3000;
SERVER_URL = 'http://localhost:8000';
INIT_REQUEST_PATH = this.SERVER_URL + '/api/v1/sdk/init';
SSE_CONNECT_PATH = this.SERVER_URL + '/api/v1/sse/subscribe';
public async init(config: SdkConfig): Promise<void> {
Iif (LightSwitch.instance != null && LightSwitch.isInitialized) {
logger.info('lightswitch is already initialized, skip init process');
return;
}
const { sdkKey, onError, onFlagChanged, reconnectTime, endpoint } = config;
this.sdkKey = sdkKey;
Iif (reconnectTime) {
this.reconnectTime = reconnectTime;
}
Iif (onError) {
this.onError = onError;
}
if (endpoint) {
this.SERVER_URL = endpoint;
this.INIT_REQUEST_PATH = this.SERVER_URL + '/api/v1/sdk/init';
this.SSE_CONNECT_PATH = this.SERVER_URL + '/api/v1/sse/subscribe';
}
this.onFlagChanged = onFlagChanged;
await this.getInitData();
logger.debug('success to getInitData');
await this.getUserKey();
logger.debug('success to getUserKey, start connecting SSE');
this.eventSource = this.getEventSource(this.userKey, this.reconnectTime);
this.addSseListener();
LightSwitch.isInitialized = true;
// logger.info('success to initialize client sdk');
}
private getVariationValue<T>(flag: Flag, LSUser: ILSUser): any {
let percentage = getHashedPercentageForObjectIds([LSUser.getUserId(), flag.title], 1);
logger.info(percentage);
Iif (flag.variations) {
for (let i = 0; i < flag.variations.length; i++) {
const variation = flag.variations[i];
percentage -= variation.portion;
logger.info(`percentage : ${percentage}, portion : ${variation.portion}`);
Iif (percentage < 0) {
// logger.info(`value : ${variation.value}`);
return variation.value as T;
}
}
}
return flag.defaultValue as T;
}
private getTypedValue<T>(flag: Flag, value: string) {
if (flag.type == 'STRING') {
return value as T;
} else if (flag.type == 'BOOLEAN') {
if (value == 'TRUE') return true as T;
else return false as T;
} else Iif (flag.type == 'INTEGER') {
return parseInt(value) as T;
}
}
public getFlag<T>(name: string, LSUser: ILSUser, defaultVal: T): T {
const flag = this.flags.get(name);
Iif (!flag) {
logger.warning(`${name} 플래그가 존재하지 않습니다. 기본값을 이용합니다.`);
return defaultVal;
}
if (!flag.active) {
logger.info(
`id : ${flag?.flagId} title : ${flag?.title} 플래그가 활성화 되어있지 않습니다. 기본값을 이용합니다.`,
);
return this.getTypedValue(flag, flag.defaultValue) as T;
} else {
Iif (flag.keywords.length > 0 && LSUser.properties?.size > 0) {
logger.info(
`id : ${flag?.flagId} title : ${flag.title} 플래그가 활성화 되어 있습니다. 키워드를 확인합니다.`,
);
for (let i = 0; i < flag.keywords.length; i++) {
const keyword = flag.keywords[i];
const isEqual = compareObjectsAndMaps(keyword.properties, LSUser.properties);
if (isEqual) {
return this.getTypedValue(flag, keyword.value) as T;
} else {
logger.info(`키워드 대상이 아닙니다. portion을 계산합니다.`);
}
}
}
logger.info(
`id : ${flag?.flagId} title : ${flag.title} 플래그가 활성화 되어 있습니다. portion을 계산합니다.`,
);
const evaluatedValue = this.getVariationValue<T>(flag, LSUser);
return this.getTypedValue(flag, evaluatedValue) as T;
}
}
private handleError(error: Error) {
Iif (this.onError) {
this.onError(error);
} else {
throw error;
}
}
public getBooleanFlag(name: string, LSUser: ILSUser, defaultVal: boolean): boolean {
const booleanFlag = this.getFlag<boolean>(name, LSUser, defaultVal);
Iif (typeof booleanFlag != 'boolean') {
this.handleError(
new LSTypeCastError(
`${name} 플래그를 BOOLEAN 타입으로 캐스팅하는데 실패했습니다.`,
),
);
}
return booleanFlag;
}
public getIntegerFlag(name: string, LSUser: ILSUser, defaultVal: number): number {
const integerFlag = this.getFlag<number>(name, LSUser, defaultVal);
Iif (typeof integerFlag != 'number') {
this.handleError(
new LSTypeCastError(
`${name} 플래그를 INTEGER 타입으로 캐스팅하는데 실패했습니다.`,
),
);
}
return integerFlag;
}
public getStringFlag(name: string, LSUser: ILSUser, defaultVal: string): string {
const stringFlag = this.getFlag<string>(name, LSUser, defaultVal);
Iif (typeof stringFlag != 'string') {
this.handleError(
new LSTypeCastError(
`${name} 플래그를 STRING 타입으로 캐스팅하는데 실패했습니다.`,
),
);
}
return stringFlag;
}
private getEventSource(
userKey: string,
reconnectTime: number,
): ReconnectingEventSource {
return new ReconnectingEventSource(this.SSE_CONNECT_PATH + '/' + userKey, {
// indicating if CORS should be set to include credentials, default `false`
withCredentials: true,
// the maximum time to wait before attempting to reconnect in ms, default `3000`
// note: wait time is randomised to prevent all clients from attempting to reconnect simultaneously
max_retry_time: reconnectTime,
// underlying EventSource class, default `EventSource`
eventSourceClass: EventSource,
});
}
private async getInitData(): Promise<void> {
const response: ApiResponse<Flag[]> = await postRequest(this.INIT_REQUEST_PATH, {
sdkKey: this.sdkKey,
});
if (response?.code == SDK_KEY_NOT_FOUND) {
this.handleError(new LSServerError(response.message));
}
const newFlags: Flag[] = response?.data;
newFlags.forEach((flag) => {
this.flags.set(flag.title, flag);
});
this.onFlagChanged?.();
// logger.info(`receive init data : ${JSON.stringify(response)}`);
}
private async getUserKey(): Promise<void> {
try {
logger.info(this.sdkKey);
const response: ApiResponse<userKey> = await postRequest(
`${this.SSE_CONNECT_PATH}`,
{
sdkKey: this.sdkKey,
},
);
this.userKey = response.data.userKey;
// logger.info(`receive userKey data : ${JSON.stringify(response)}`);
} catch (error) {
Iif (error instanceof Error) {
this.handleError(new LSServerError(error.message));
}
}
}
public getAllFlags(): Flags {
return this.flags;
}
private addSseListener(): void {
this.eventSource?.addEventListener('sse', (event: MessageEvent) => {
Iif (event.data === 'SSE connected') {
return;
}
const data: LSMessage = JSON.parse(event.data);
logger.info(data.type);
switch (data.type) {
case 'CREATE':
const createData = data.data as Flag;
this.addFlag(createData);
break;
case 'UPDATE':
const updateData = data.data as Flag;
this.updateFlag(updateData);
break;
case 'DELETE':
const deleteData = data.data as Title;
this.deleteFlag(deleteData);
break;
case 'SWITCH': // not used
const switchData = data.data as Switch;
this.switchFlag(switchData);
break;
}
this.flags.forEach((f) => {
logger.info(`updated flag : ${JSON.stringify(f)}`);
});
this.onFlagChanged?.();
});
}
private addFlag(flag: Flag): void {
logger.info('addFlag call');
this.flags.set(flag.title, flag);
}
private updateFlag(newFlag: Flag): void {
logger.info('updateFlag call');
this.flags.delete(newFlag.title);
this.flags.set(newFlag.title, newFlag);
}
private deleteFlag(title: Title): void {
logger.info('deleteFlag call');
this.flags.delete(title.title);
}
private switchFlag(sw: Switch): void {
logger.info('switchFlag call');
const flag = this.flags.get(sw.title);
const newFlag = JSON.parse(JSON.stringify(flag));
newFlag.active = sw.active;
this.flags.set(sw.title, newFlag);
logger.info(newFlag);
}
public destroy(): void {
Iif (!LightSwitch.isInitialized) {
throw new Error('LightSwitch is not initialized.');
}
this.eventSource?.close();
LightSwitch.isInitialized = false;
logger.debug('call destroy');
}
}
export default LightSwitch;
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