77 lines
1.7 KiB
TypeScript
77 lines
1.7 KiB
TypeScript
import { EventEmitter } from "events";
|
|
import { ChildProcess } from "child_process";
|
|
|
|
export interface IpcMessage {
|
|
readonly event: string;
|
|
readonly args: any[]; // tslint:disable-line no-any
|
|
}
|
|
|
|
export class StdioIpcHandler extends EventEmitter {
|
|
private isListening: boolean = false;
|
|
|
|
public constructor(
|
|
private readonly childProcess?: ChildProcess,
|
|
) {
|
|
super();
|
|
}
|
|
|
|
// tslint:disable-next-line no-any
|
|
public on(event: string, cb: (...args: any[]) => void): this {
|
|
this.listen();
|
|
|
|
return super.on(event, cb);
|
|
}
|
|
|
|
// tslint:disable-next-line no-any
|
|
public once(event: string, cb: (...args: any[]) => void): this {
|
|
this.listen();
|
|
|
|
return super.once(event, cb);
|
|
}
|
|
|
|
// tslint:disable-next-line no-any
|
|
public addListener(event: string, cb: (...args: any[]) => void): this {
|
|
this.listen();
|
|
|
|
return super.addListener(event, cb);
|
|
}
|
|
|
|
// tslint:disable-next-line no-any
|
|
public send(event: string, ...args: any[]): void {
|
|
const msg: IpcMessage = {
|
|
event,
|
|
args,
|
|
};
|
|
const d = JSON.stringify(msg);
|
|
if (this.childProcess) {
|
|
this.childProcess.stdin.write(d + "\n");
|
|
} else {
|
|
process.stdout.write(d);
|
|
}
|
|
}
|
|
|
|
private listen(): void {
|
|
if (this.isListening) {
|
|
return;
|
|
}
|
|
// tslint:disable-next-line no-any
|
|
const onData = (data: any): void => {
|
|
try {
|
|
const d = JSON.parse(data.toString()) as IpcMessage;
|
|
this.emit(d.event, ...d.args);
|
|
} catch (ex) {
|
|
if (!this.childProcess) {
|
|
process.stderr.write(`Failed to parse incoming data: ${ex.message}`);
|
|
}
|
|
}
|
|
};
|
|
if (this.childProcess) {
|
|
this.childProcess.stdout.resume();
|
|
this.childProcess.stdout.on("data", onData);
|
|
} else {
|
|
process.stdin.resume();
|
|
process.stdin.on("data", onData);
|
|
}
|
|
}
|
|
}
|