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ClientEventEmitter,
ClientEvents,
JobId,
JobQueue,
WorkerEventEmitter,
WorkerEvents,
Job,
JobWorker,
BasePayload,
} from "./JobQueue.js";
import { Redis } from "ioredis";
import { randomUUID } from "crypto";
import { RootLogger } from "../util";
import { Duration } from "durr";
import { List } from "immutable";
interface ClientStreamMessage<
Response,
Client extends ClientEvents<Response> = ClientEvents<Response>
> {
readonly type: keyof Client;
readonly payload: Parameters<Client[keyof Client]>;
}
interface WorkerStreamMessage<Worker extends WorkerEvents = WorkerEvents> {
readonly type: keyof Worker;
readonly payload: Parameters<Worker[keyof Worker]>;
}
interface JobWrapper<Payload extends BasePayload = BasePayload> {
readonly id: JobId;
readonly job: Job<Payload>;
}
const log = RootLogger.getChildCategory("RedisJobQueue");
class WorkerContextEmitter<
Response,
Client extends ClientEvents<Response> = ClientEvents<Response>
> extends ClientEventEmitter<Response, Client> {
constructor(
private defaultHandler: <U extends keyof Client>(
event: U,
...args: Parameters<Client[U]>
) => void
) {
super();
}
override emit<U extends keyof Client>(
event: U,
...args: Parameters<Client[U]>
): boolean {
const superCall = super.emit(event, ...args);
if (!superCall) {
this.defaultHandler(event, ...args);
}
return true;
}
}
interface StreamReader {
readonly cancel: () => void;
}
export class RedisJobQueue<
Payload extends BasePayload = BasePayload,
Response = undefined,
Client extends ClientEvents<Response> = ClientEvents<Response>,
Worker extends WorkerEvents = WorkerEvents
> implements JobQueue<Payload, Response, Client, Worker>
{
private readonly redis: Redis;
private readonly id: string;
private readonly queueId: string;
constructor(redis: Redis, id: string = randomUUID()) {
this.redis = redis;
this.id = id;
this.queueId = `JobQueue:${id}:Queue`;
}
async close() {
await this.redis.quit();
}
async notify(
jobId: string,
eventName: keyof Worker,
...params: Parameters<Worker[typeof eventName]>
): Promise<void> {
await this.sendWorkerMessage(jobId, eventName, ...params);
}
private mkWorkerStreamId = (jobId: JobId) =>
`JobQueue:${this.id}:Worker:${jobId}`;
private mkClientStreamId = (jobId: JobId) =>
`JobQueue:${this.id}:Client:${jobId}`;
private async readStream(
streamId: string,
handler: (messages: string) => void,
lastId = "0-0"
): Promise<StreamReader> {
const conn = this.redis.duplicate({ connectionName: streamId });
let isCanceled = false;
log.info(`Starting read from ${streamId}`);
const id = await conn.client("ID");
const read = (internalLastId = "0-0") => {
conn
.xread("BLOCK", 0, "STREAMS", streamId, internalLastId)
.then(async (results) => {
if (results && results[0]) {
const [, messages] = results[0];
const ids = List(messages).map((it) => it[0]);
const latestLastId = ids.last() ?? internalLastId;
messages
.flatMap(([, fields]) =>
// key value pairs, and we only want the values for the messages
fields.filter((value, index) => index % 2 == 1 && value)
)
.forEach((it) => {
// log.info(`Received message from ${streamId}: ${it}`);
handler(it);
});
// if (!ids.isEmpty()) {
// await conn.xdel(streamId, ...ids.toArray());
// }
if (!isCanceled) {
read(latestLastId);
}
} else {
if (!isCanceled) {
read();
}
}
});
};
read(lastId);
return {
cancel: async () => {
log.info(`Canceling read from ${streamId}`);
isCanceled = true;
await this.redis.client("UNBLOCK", id);
conn.disconnect();
log.info(`Canceled read from ${streamId}`);
},
};
}
async monitor(jobId: JobId): Promise<ClientEventEmitter<Response, Client>> {
const emitter = new ClientEventEmitter<Response, Client>();
setDefaultClientEventEmitterCloseHandlers(emitter);
const reader = await this.readStream(
this.mkClientStreamId(jobId),
(field) => {
const clientStreamMessage: ClientStreamMessage<Response, Client> =
JSON.parse(field);
emitter.emit(clientStreamMessage.type, ...clientStreamMessage.payload);
}
);
emitter.on("close", () => reader.cancel());
return emitter;
}
async register(
handler: (
job: Job<Payload>,
context: ClientEventEmitter<Response, Client>,
workerEvents: WorkerEventEmitter<Worker>
) => void
): Promise<JobWorker> {
const redisInstance = this.redis.duplicate({ connectionName: "JobWorker" });
let isCanceled = false;
log.info(`Starting to read from queue ${this.queueId}`);
(async () => {
while (!isCanceled) {
const item = await redisInstance.blpop(this.queueId, 0);
if (item) {
const [, rawWrapper] = item;
const wrapper: JobWrapper<Payload> = JSON.parse(rawWrapper);
const contextEmitter = new WorkerContextEmitter<Response, Client>(
(event, ...args) =>
this.sendClientMessage(wrapper.id, event, ...args)
);
const workerEmitter = await this.mkWorkerEventEmitter(wrapper.id);
await handler(wrapper.job, contextEmitter, workerEmitter);
workerEmitter.emit("close");
}
}
})().then();
return {
isCanceled: () => isCanceled,
cancel: async () => {
log.info(`Stopping read from queue ${this.queueId}`);
isCanceled = true;
redisInstance.disconnect();
},
};
}
private sendClientMessage(
jobId: JobId,
messageType: keyof Client,
...handlerArgs: unknown[]
) {
this.redis.xadd(
this.mkClientStreamId(jobId),
"*",
randomUUID(),
JSON.stringify({
type: messageType.toString(),
payload: handlerArgs,
} as ClientStreamMessage<Client>)
);
}
private async sendWorkerMessage(
jobId: JobId,
messageType: keyof Worker,
...handlerArgs: unknown[]
): Promise<void> {
await this.redis.xadd(
this.mkWorkerStreamId(jobId),
"*",
randomUUID(),
JSON.stringify({
type: messageType.toString(),
payload: handlerArgs,
} as WorkerStreamMessage<Worker>)
);
}
private async mkWorkerEventEmitter(
jobId: JobId
): Promise<WorkerEventEmitter<WorkerEvents>> {
const emitter = new WorkerEventEmitter();
const reader = await this.readStream(
this.mkWorkerStreamId(jobId),
(field) => {
const workerStreamMessage = JSON.parse(field) as WorkerStreamMessage;
emitter.emit(workerStreamMessage.type, ...workerStreamMessage.payload);
}
);
emitter.on("close", () => reader.cancel());
return emitter;
}
async submit(
job: Job<Payload>,
preHook?: (
emitter: ClientEventEmitter<Response, Client>,
id: JobId
) => Promise<void>
): Promise<JobId> {
const id: JobId = randomUUID();
await Promise.all([
this.setupWorkerStream(
this.mkWorkerStreamId(id),
Duration.days(1).after()
),
this.setupClientStream(
this.mkClientStreamId(id),
Duration.days(1).after()
),
]);
if (preHook) {
const emitter = await this.monitor(id);
await preHook(emitter, id);
}
return this.redis
.lpush(
this.queueId,
JSON.stringify({
id: id,
job: job,
} as JobWrapper<Payload>)
)
.then(() => id);
}
cancel(jobId: JobId) {
this.redis.xadd(
this.mkWorkerStreamId(jobId),
"*",
randomUUID(),
JSON.stringify({
type: "cancel",
payload: [] as unknown[],
} as WorkerStreamMessage<Worker>)
);
}
private setupWorkerStream = (streamId: string, expiration: Date) =>
this.setupStream(
streamId,
expiration,
JSON.stringify({
type: "init",
payload: [] as unknown[],
} as ClientStreamMessage<Client>)
);
private setupClientStream = (streamId: string, expiration: Date) =>
this.setupStream(
streamId,
expiration,
JSON.stringify({
type: "init",
payload: [] as unknown[],
} as WorkerStreamMessage<Worker>)
);
private setupStream(streamId: string, expiration: Date, message: string) {
return this.redis.xadd(streamId, "*", randomUUID(), message).then((res) => {
if (res) {
return this.redis
.xdel(streamId, res)
.then(() =>
this.redis.expire(streamId, calculateTtlSecs(expiration))
);
} else {
log.error(
"Failed to initialize stream - no id assigned to init message."
);
return Promise.resolve(0);
}
});
}
}
function calculateTtlSecs(expiration: Date): number {
return Math.ceil(Duration.between(new Date(), expiration).seconds);
}
function setDefaultClientEventEmitterCloseHandlers(
emitter: ClientEventEmitter<unknown>
) {
emitter.on("success", () => emitter.emit("close"));
emitter.on("fail", () => emitter.emit("close"));
}
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