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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,114 +1,59 @@ | ||
| import {AsyncCallback} from "@bunt/util"; | ||
| import {ISubscriptionManager} from "./interfaces"; | ||
| import {Disposable} from "@bunt/unit"; | ||
| import {all} from "@bunt/util"; | ||
| import {SubscriptionManager} from "./SubscriptionManager"; | ||
| import {SubscriptionIterator} from "./SubscriptionIterator"; | ||
|
|
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| export class Subscription<T> implements AsyncIterable<T> { | ||
| export class Subscription<T> implements AsyncIterable<T>, Disposable { | ||
| public readonly channel: string; | ||
|
|
||
| readonly #parser: (message: string) => T; | ||
| readonly #manager: ISubscriptionManager; | ||
| readonly #subscriptions = new Set<AsyncCallback<T>>(); | ||
| readonly #manager: SubscriptionManager; | ||
| readonly #subscriptions = new Set<SubscriptionIterator<T>>(); | ||
|
|
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| constructor(channel: string, manager: ISubscriptionManager, parser: (message: string) => T) { | ||
| constructor(channel: string, manager: SubscriptionManager, parser: (message: string) => T) { | ||
| this.channel = channel; | ||
| this.#manager = manager; | ||
| this.#parser = parser; | ||
| } | ||
|
|
||
| public async *subscribe(): AsyncGenerator<T> { | ||
| return this[Symbol.asyncIterator]; | ||
| public get size() { | ||
| return this.#subscriptions.size; | ||
| } | ||
|
|
||
| public ensure(): Promise<void> { | ||
| return this.#manager.ensure(this.channel); | ||
| } | ||
|
|
||
| /** | ||
| * Unsubscribe all active subscriptions | ||
| */ | ||
| public async unsubscribe() { | ||
| const pending: Promise<void>[] = []; | ||
| for (const iterator of this.#subscriptions.values()) { | ||
| iterator.dispose(); | ||
| pending.push(iterator.destroy()); | ||
| } | ||
|
|
||
| await all(pending); | ||
| } | ||
|
|
||
| public async* [Symbol.asyncIterator](): AsyncGenerator<T> { | ||
| const generator = new SubscriptionGenerator<T>(); | ||
| const id = await this.#manager.subscribe( | ||
| public [Symbol.asyncIterator](): SubscriptionIterator<T> { | ||
| const iterator = new SubscriptionIterator<T>(); | ||
| const id = this.#manager.on( | ||
| this.channel, | ||
| (message) => generator.push(this.#parser(message)), | ||
| (message) => iterator.push(this.#parser(message)), | ||
| ); | ||
|
|
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| generator.stop = async () => { | ||
| await this.#manager.unsubscribe(id); | ||
| }; | ||
|
|
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| return generator; | ||
| } | ||
| } | ||
|
|
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| class SubscriptionGenerator<T, TNext = unknown> implements AsyncGenerator<T, undefined, TNext> { | ||
| readonly #queue: Defer<T | undefined>[] = []; | ||
| #done = false; | ||
|
|
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| public pull(): Defer<T | undefined> { | ||
| const pending = new Defer<T | undefined>(); | ||
| this.#queue.push(pending); | ||
|
|
||
| return pending; | ||
| } | ||
|
|
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| public push(value: T | undefined): void { | ||
| this.#queue.splice(0, this.#queue.length) | ||
| .forEach((pending) => pending.resolve(value)); | ||
| } | ||
|
|
||
| public async next(): Promise<IteratorResult<T, undefined>> { | ||
| const value = await this.pull(); | ||
| if (value) { | ||
| return {value}; | ||
| } | ||
|
|
||
| return {value: undefined, done: true}; | ||
| } | ||
|
|
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| public async return(): Promise<IteratorResult<T, undefined>> { | ||
| this.close(); | ||
|
|
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| return {value: undefined, done: true}; | ||
| } | ||
|
|
||
| public async throw(): Promise<IteratorResult<T, undefined>> { | ||
| this.close(); | ||
|
|
||
| return {value: undefined, done: true}; | ||
| } | ||
|
|
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| public [Symbol.asyncIterator](): AsyncGenerator<T, undefined, TNext> { | ||
| return this; | ||
| } | ||
|
|
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| public stop?(): unknown; | ||
|
|
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| private async close() { | ||
| await this.stop?.(); | ||
| this.push(undefined); | ||
| } | ||
| } | ||
|
|
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| class Defer<T> extends Promise<T> { | ||
| #resolve = (_value: T | PromiseLike<T>) => { | ||
| // noop | ||
| }; | ||
|
|
||
| #reject = (_error: Error) => { | ||
| // noop | ||
| }; | ||
|
|
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| constructor() { | ||
| super((resolve, reject) => { | ||
| this.#resolve = resolve; | ||
| this.#reject = reject; | ||
| iterator.unsubscribe(() => { | ||
| this.#manager.off(id); | ||
| this.#subscriptions.delete(iterator); | ||
| }); | ||
| } | ||
|
|
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| public resolve(value: T | PromiseLike<T>) { | ||
| this.#resolve(value); | ||
| this.#subscriptions.add(iterator); | ||
|
|
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| return iterator; | ||
| } | ||
|
|
||
| public reject(error: Error) { | ||
| this.#reject(error); | ||
| public async dispose() { | ||
| await this.unsubscribe(); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,38 @@ | ||
| import {AsyncPushPull, isUndefined, Promisify} from "@bunt/util"; | ||
|
|
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| export class SubscriptionIterator<T, TNext = unknown> extends AsyncPushPull<T | undefined> | ||
| implements AsyncIterator<T, undefined, TNext> { | ||
| #unsubscribe?: () => Promisify<void>; | ||
|
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| #done = false; | ||
|
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| public async next(): Promise<IteratorResult<T, undefined>> { | ||
| const value = await this.pull(); | ||
| if (isUndefined(value)) { | ||
| return {value, done: true}; | ||
| } | ||
|
|
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| return {value, done: false}; | ||
| } | ||
|
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| public async return(): Promise<IteratorResult<T, undefined>> { | ||
| this.destroy(); | ||
|
|
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| return {value: undefined, done: true}; | ||
| } | ||
|
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| public async throw(): Promise<IteratorResult<T, undefined>> { | ||
| this.destroy(); | ||
|
|
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| return {value: undefined, done: true}; | ||
| } | ||
|
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| public unsubscribe(fn: () => Promisify<void>): void { | ||
| this.#unsubscribe = fn; | ||
| } | ||
|
|
||
| public async destroy() { | ||
| await this.#unsubscribe?.(); | ||
| super.destroy(); | ||
| } | ||
| } |
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