1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 | 1x 1x 1x 1x 23x 23x 23x 23x 23x 3x 3x 3x 3x 3x 3x 3x 5x 5x 5x 1x 1x 1x 1x 6x 2x 2x 2x 2x 2x 1x 1x 1x 1x 3x 1x 2x 2x 2x 2x 2x 6x 1x 1x 6x 1x 5x 4x 1x | import { Observable } from 'rxjs'; import { CONNECT_EVENT, ERROR_EVENT, MESSAGE_EVENT, NO_PATTERN_MESSAGE, REDIS_DEFAULT_URL, } from '../constants'; import { ClientOpts, RedisClient, RetryStrategyOptions, } from '../external/redis.interface'; import { CustomTransportStrategy, PacketId, ReadPacket } from '../interfaces'; import { MicroserviceOptions, RedisOptions, } from '../interfaces/microservice-configuration.interface'; import { Server } from './server'; let redisPackage: any = {}; export class ServerRedis extends Server implements CustomTransportStrategy { private readonly url: string; private subClient: RedisClient; private pubClient: RedisClient; private isExplicitlyTerminated = false; constructor(private readonly options: MicroserviceOptions['options']) { super(); this.url = this.getOptionsProp<RedisOptions>(this.options, 'url') || REDIS_DEFAULT_URL; redisPackage = this.loadPackage('redis', ServerRedis.name); } public listen(callback: () => void) { this.subClient = this.createRedisClient(); this.pubClient = this.createRedisClient(); this.handleError(this.pubClient); this.handleError(this.subClient); this.start(callback); } public start(callback?: () => void) { this.bindEvents(this.subClient, this.pubClient); this.subClient.on(CONNECT_EVENT, callback); } public bindEvents(subClient: RedisClient, pubClient: RedisClient) { subClient.on(MESSAGE_EVENT, this.getMessageHandler(pubClient).bind(this)); const subscribePatterns = Object.keys(this.messageHandlers); subscribePatterns.forEach(pattern => subClient.subscribe(this.getAckQueueName(pattern)), ); } public close() { this.isExplicitlyTerminated = true; this.pubClient && this.pubClient.quit(); this.subClient && this.subClient.quit(); } public createRedisClient(): RedisClient { return redisPackage.createClient({ ...this.getClientOptions(), url: this.url, }); } public getMessageHandler(pub: RedisClient) { return async (channel, buffer) => this.handleMessage(channel, buffer, pub); } public async handleMessage(channel, buffer: string | any, pub: RedisClient) { const packet = this.deserialize(buffer); const pattern = channel.replace(/_ack$/, ''); const publish = this.getPublisher(pub, pattern, packet.id); const status = 'error'; if (!this.messageHandlers[pattern]) { return publish({ id: packet.id, status, err: NO_PATTERN_MESSAGE }); } const handler = this.messageHandlers[pattern]; const response$ = this.transformToObservable( await handler(packet.data), ) as Observable<any>; response$ && this.send(response$, publish); } public getPublisher(pub: RedisClient, pattern: any, id: string) { return response => pub.publish( this.getResQueueName(pattern), JSON.stringify(Object.assign(response, { id })), ); } public deserialize(content): ReadPacket & PacketId { try { return JSON.parse(content); } catch (e) { return content; } } public getAckQueueName(pattern: string): string { return `${pattern}_ack`; } public getResQueueName(pattern: string): string { return `${pattern}_res`; } public handleError(stream) { stream.on(ERROR_EVENT, err => this.logger.error(err)); } public getClientOptions(): Partial<ClientOpts> { const retry_strategy = options => this.createRetryStrategy(options); return { retry_strategy, }; } public createRetryStrategy( options: RetryStrategyOptions, ): undefined | number | void { if (options.error && (options.error as any).code === 'ECONNREFUSED') { return this.logger.error(`Error ECONNREFUSED: ${this.url}`); } if ( this.isExplicitlyTerminated || !this.getOptionsProp<RedisOptions>(this.options, 'retryAttempts') || options.attempt > this.getOptionsProp<RedisOptions>(this.options, 'retryAttempts') ) { return undefined; } return this.getOptionsProp<RedisOptions>(this.options, 'retryDelay') || 0; } } |