87 lines
2.5 KiB
TypeScript
87 lines
2.5 KiB
TypeScript
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import { logger } from "./logger.js";
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import type { Numeric } from "@ethersproject/logger";
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import type { Listener } from "./events.js"
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export class Signal {
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#listeners: Array<Listener>;
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#reason: null | "invalidated" | "timeout" | "cancel";
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#timer: null | NodeJS.Timer;
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constructor(_timeout?: Numeric) {
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this.#listeners = [ ];
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this.#reason = null;
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this.#timer = null;
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if (_timeout != null) {
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this.#timer = setTimeout(() => {
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this.#invalidate("timeout");
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}, logger.getNumber(_timeout, "timeout"));
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if (this.#timer.unref) { this.#timer.unref(); }
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}
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}
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// Whether the Signal has been invalidated; if true, any newly added
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// llistener will immediately receive a "invalidated" event
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get invalidated(): boolean { return (this.#reason === "invalidated"); }
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// Sends a "cancel" signal to all listeners
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cancel(): boolean {
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return this.#invalidate("cancel");
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}
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// Stops the Signal, without signalling; any new listeners will
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// receive an "invalidated" event on registration.
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#invalidate(reason: "cancel" | "invalidated" | "timeout"): boolean {
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if (this.#reason) { return false; }
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if (this.#timer != null) { clearTimeout(this.#timer); }
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this.#reason = reason;
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if (reason !== "invalidated") {
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const listeners = this.#listeners.slice();
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listeners.forEach((listener) => {
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try {
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listener.call(this, reason, this.#makeError());
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} catch (error) { }
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});
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}
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return true;
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}
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invalidate(): boolean {
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return this.#invalidate("invalidated");
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}
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#makeError(): Error {
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const reason = this.#reason || "unknown"
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return logger.makeError(reason, "TIMEOUT", { operation: "signal", reason });
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}
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addListener(listener: Listener): this {
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this.#listeners.push(listener);
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if (this.#reason) {
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try {
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setTimeout(() => {
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listener.call(this, this.#reason, this.#makeError());
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}, 0);
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} catch (error) { }
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}
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return this;
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}
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removeListener(listener: Listener): this {
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const index = this.#listeners.indexOf(listener);
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if (index >= 0) { this.#listeners.splice(index, 1); }
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return this;
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}
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//link(other: Signal): void {
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// this.on((event: "timeout" | "cancel") => { other.#invalidate(event); });
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//}
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}
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