/
client-redis.ts
183 lines (162 loc) 路 5.07 KB
/
client-redis.ts
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import { Logger } from '@nestjs/common/services/logger.service';
import { loadPackage } from '@nestjs/common/utils/load-package.util';
import { fromEvent, merge, Subject, zip } from 'rxjs';
import { share, take, tap } from 'rxjs/operators';
import {
CONNECT_EVENT,
ERROR_EVENT,
MESSAGE_EVENT,
REDIS_DEFAULT_URL,
} from '../constants';
import {
ClientOpts,
RedisClient,
RetryStrategyOptions,
} from '../external/redis.interface';
import { PacketId, ReadPacket, RedisOptions, WritePacket } from '../interfaces';
import { ClientOptions } from '../interfaces/client-metadata.interface';
import { ClientProxy } from './client-proxy';
import { ECONNREFUSED } from './constants';
let redisPackage: any = {};
export class ClientRedis extends ClientProxy {
protected readonly logger = new Logger(ClientProxy.name);
protected readonly url: string;
protected pubClient: RedisClient;
protected subClient: RedisClient;
protected connection: Promise<any>;
protected isExplicitlyTerminated = false;
constructor(protected readonly options: ClientOptions['options']) {
super();
this.url =
this.getOptionsProp<RedisOptions>(options, 'url') || REDIS_DEFAULT_URL;
redisPackage = loadPackage('redis', ClientRedis.name, () =>
require('redis'),
);
}
public getAckPatternName(pattern: string): string {
return `${pattern}_ack`;
}
public getResPatternName(pattern: string): string {
return `${pattern}_res`;
}
public close() {
this.pubClient && this.pubClient.quit();
this.subClient && this.subClient.quit();
this.pubClient = this.subClient = null;
this.isExplicitlyTerminated = true;
}
public connect(): Promise<any> {
if (this.pubClient && this.subClient) {
return this.connection;
}
const error$ = new Subject<Error>();
this.pubClient = this.createClient(error$);
this.subClient = this.createClient(error$);
this.handleError(this.pubClient);
this.handleError(this.subClient);
const pubConnect$ = fromEvent(this.pubClient, CONNECT_EVENT);
const subClient$ = fromEvent(this.subClient, CONNECT_EVENT);
this.connection = merge(error$, zip(pubConnect$, subClient$))
.pipe(
take(1),
tap(() =>
this.subClient.on(MESSAGE_EVENT, this.createResponseCallback()),
),
share(),
)
.toPromise();
return this.connection;
}
public createClient(error$: Subject<Error>): RedisClient {
return redisPackage.createClient({
...this.getClientOptions(error$),
url: this.url,
});
}
public handleError(client: RedisClient) {
client.addListener(ERROR_EVENT, (err: any) => this.logger.error(err));
}
public getClientOptions(error$: Subject<Error>): Partial<ClientOpts> {
const retry_strategy = (options: RetryStrategyOptions) =>
this.createRetryStrategy(options, error$);
return {
retry_strategy,
};
}
public createRetryStrategy(
options: RetryStrategyOptions,
error$: Subject<Error>,
): undefined | number | Error {
if (options.error && (options.error as any).code === ECONNREFUSED) {
error$.error(options.error);
return options.error;
}
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;
}
public createResponseCallback(): (channel: string, buffer: string) => void {
return (channel: string, buffer: string) => {
const { err, response, isDisposed, id } = JSON.parse(
buffer,
) as WritePacket & PacketId;
const callback = this.routingMap.get(id);
if (!callback) {
return;
}
if (isDisposed || err) {
return callback({
err,
response: null,
isDisposed: true,
});
}
callback({
err,
response,
});
};
}
protected publish(
partialPacket: ReadPacket,
callback: (packet: WritePacket) => any,
): Function {
try {
const packet = this.assignPacketId(partialPacket);
const pattern = this.normalizePattern(partialPacket.pattern);
const responseChannel = this.getResPatternName(pattern);
this.routingMap.set(packet.id, callback);
this.subClient.subscribe(responseChannel, (err: any) => {
if (err) {
return;
}
this.pubClient.publish(
this.getAckPatternName(pattern),
JSON.stringify(packet),
);
});
return () => {
this.subClient.unsubscribe(responseChannel);
this.routingMap.delete(packet.id);
};
} catch (err) {
callback({ err });
}
}
protected dispatchEvent(packet: ReadPacket): Promise<any> {
const pattern = this.normalizePattern(packet.pattern);
return new Promise((resolve, reject) =>
this.pubClient.publish(
pattern,
JSON.stringify(packet),
err => (err ? reject(err) : resolve()),
),
);
}
}