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| 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 | 1x 1x 27x 200x 25x 25x 1x 24x 24x 24x 24x 22x 22x 2x 2x 2x 2x 2x 2x 2x 24x 24x 24x 24x 24x 1x 39x 25x 47x 25x 25x 25x 25x 25x 4x 4x 21x 21x 21x 21x 21x 21x 1x 18x 18x 18x 16x 12x 12x 12x 4x 4x 16x 1x 7x 1x 1x 1x 1x 1x 3x 1x 18x 18x 16x 16x 1x 32x 17x 17x 1x | import {Cluster, Ok, Redis, RedisOptions} from 'ioredis';
import {PubSubEngine} from 'graphql-subscriptions';
import {PubSubAsyncIterator} from './pubsub-async-iterator';
type RedisClient = Redis | Cluster;
type OnMessage<T> = (message: T) => void;
export interface PubSubRedisOptions {
connection?: RedisOptions;
triggerTransform?: TriggerTransform;
connectionListener?: (err: Error) => void;
publisher?: RedisClient;
subscriber?: RedisClient;
reviver?: Reviver;
serializer?: Serializer;
deserializer?: Deserializer;
}
export class RedisPubSub implements PubSubEngine {
constructor(options: PubSubRedisOptions = {}) {
const {
triggerTransform,
connection,
connectionListener,
subscriber,
publisher,
reviver,
serializer,
deserializer,
} = options;
this.triggerTransform = triggerTransform || (trigger => trigger as string);
if (reviver && deserializer) {
throw new Error("Reviver and deserializer can't be used together");
}
this.reviver = reviver;
this.serializer = serializer;
this.deserializer = deserializer;
if (subscriber && publisher) {
this.redisPublisher = publisher;
this.redisSubscriber = subscriber;
} else {
try {
// eslint-disable-next-line @typescript-eslint/no-var-requires
const IORedis = require('ioredis');
this.redisPublisher = new IORedis(connection);
this.redisSubscriber = new IORedis(connection);
Iif (connectionListener) {
this.redisPublisher
.on('connect', connectionListener)
.on('error', connectionListener);
this.redisSubscriber
.on('connect', connectionListener)
.on('error', connectionListener);
} else {
this.redisPublisher.on('error', console.error);
this.redisSubscriber.on('error', console.error);
}
} catch (error) {
console.error(
`No publisher or subscriber instances were provided and the package 'ioredis' wasn't found. Couldn't create Redis clients.`,
);
}
}
// handle messages received via psubscribe and subscribe
this.redisSubscriber.on('pmessage', this.onMessage.bind(this));
// partially applied function passes undefined for pattern arg since 'message' event won't provide it:
this.redisSubscriber.on('message', this.onMessage.bind(this, undefined));
this.subscriptionMap = {};
this.subsRefsMap = {};
this.currentSubscriptionId = 0;
}
public async publish<T>(trigger: string, payload: T): Promise<void> {
await this.redisPublisher.publish(trigger, this.serializer ? this.serializer(payload) : JSON.stringify(payload));
}
public subscribe<T = any>(
trigger: string,
onMessage: OnMessage<T>,
options: unknown = {},
): Promise<number> {
const triggerName: string = this.triggerTransform(trigger, options);
const id = this.currentSubscriptionId++;
this.subscriptionMap[id] = [triggerName, onMessage];
const refs = this.subsRefsMap[triggerName];
if (refs && refs.length > 0) {
this.subsRefsMap[triggerName] = [...refs, id];
return Promise.resolve(id);
} else {
return new Promise<number>((resolve, reject) => {
const subscribeFn = options['pattern'] ? this.redisSubscriber.psubscribe : this.redisSubscriber.subscribe;
subscribeFn.call(this.redisSubscriber, triggerName, err => {
Iif (err) {
reject(err);
} else {
this.subsRefsMap[triggerName] = [
...(this.subsRefsMap[triggerName] || []),
id,
];
resolve(id);
}
});
});
}
}
public unsubscribe(subId: number): void {
const [triggerName = null] = this.subscriptionMap[subId] || [];
const refs = this.subsRefsMap[triggerName];
if (!refs) throw new Error(`There is no subscription of id "${subId}"`);
if (refs.length === 1) {
// unsubscribe from specific channel and pattern match
this.redisSubscriber.unsubscribe(triggerName);
this.redisSubscriber.punsubscribe(triggerName);
delete this.subsRefsMap[triggerName];
} else {
const index = refs.indexOf(subId);
this.subsRefsMap[triggerName] = index === -1
? refs
: [...refs.slice(0, index), ...refs.slice(index + 1)];
}
delete this.subscriptionMap[subId];
}
public asyncIterator<T>(triggers: string | string[], options?: unknown): AsyncIterator<T> {
return new PubSubAsyncIterator<T>(this, triggers, options);
}
public getSubscriber(): RedisClient {
return this.redisSubscriber;
}
public getPublisher(): RedisClient {
return this.redisPublisher;
}
public close(): Promise<Ok[]> {
return Promise.all([
this.redisPublisher.quit(),
this.redisSubscriber.quit(),
]);
}
private readonly serializer?: Serializer;
private readonly deserializer?: Deserializer;
private readonly triggerTransform: TriggerTransform;
private readonly redisSubscriber: RedisClient;
private readonly redisPublisher: RedisClient;
private readonly reviver: Reviver;
private readonly subscriptionMap: { [subId: number]: [string, OnMessage<unknown>] };
private readonly subsRefsMap: { [trigger: string]: Array<number> };
private currentSubscriptionId: number;
private onMessage(pattern: string, channel: string, message: string) {
const subscribers = this.subsRefsMap[pattern || channel];
// Don't work for nothing..
if (!subscribers || !subscribers.length) return;
let parsedMessage;
try {
parsedMessage = this.deserializer ? this.deserializer(message) : JSON.parse(message, this.reviver);
} catch (e) {
parsedMessage = message;
}
for (const subId of subscribers) {
const [, listener] = this.subscriptionMap[subId];
listener(parsedMessage);
}
}
}
export type Path = Array<string | number>;
export type Trigger = string | Path;
export type TriggerTransform = (
trigger: Trigger,
channelOptions?: unknown,
) => string;
export type Reviver = (key: any, value: any) => any;
export type Serializer = (source: any) => string;
export type Deserializer = (source: string) => any;
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