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import { tmpdir } from "node:os";
import { join } from "node:path";
import type { Server } from "node:net";
import { createServer } from "node:net";
import { EventEmitter } from "node:events";
const isDebug = process.env.NODE_ENV === "development";
export type UnixSignalEventMap = {
"Signal.listening": [string];
"Signal.error": [Error];
"Signal.received": [string];
"Signal.closed": [];
};
/**
* Starts a server that listens for signals on a UNIX domain socket.
*/
export class UnixSignal extends EventEmitter<UnixSignalEventMap> {
#path: string;
#server: Server;
#ready: Promise<void>;
constructor(path?: string) {
super();
this.#path = path ? parseUnixPath(path) : randomUnixPath();
this.#server = createServer();
this.#server.on("listening", () => this.emit("Signal.listening", this.#path));
this.#server.on("error", error => this.emit("Signal.error", error));
this.#server.on("close", () => this.emit("Signal.closed"));
this.#server.on("connection", socket => {
socket.on("data", data => {
this.emit("Signal.received", data.toString());
});
});
this.#ready = new Promise((resolve, reject) => {
this.#server.on("listening", resolve);
this.#server.on("error", reject);
});
this.#server.listen(this.#path);
}
emit<E extends keyof UnixSignalEventMap>(event: E, ...args: UnixSignalEventMap[E]): boolean {
if (isDebug) {
console.log(event, ...args);
}
return super.emit(event, ...args);
}
/**
* The path to the UNIX domain socket.
*/
get url(): string {
return `unix://${this.#path}`;
}
/**
* Resolves when the server is listening or rejects if an error occurs.
*/
get ready(): Promise<void> {
return this.#ready;
}
/**
* Closes the server.
*/
close(): void {
this.#server.close();
}
}
function randomUnixPath(): string {
return join(tmpdir(), `${Math.random().toString(36).slice(2)}.sock`);
}
function parseUnixPath(path: string): string {
if (path.startsWith("/")) {
return path;
}
try {
const { pathname } = new URL(path);
return pathname;
} catch {
throw new Error(`Invalid UNIX path: ${path}`);
}
}
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