98 lines
2.7 KiB
TypeScript
98 lines
2.7 KiB
TypeScript
import * as plugins from './tswatch.plugins';
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import { logger } from './tswatch.logging';
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export interface IWatcherConstructorOptions {
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filePathToWatch: string;
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commandToExecute: string;
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timeout?: number;
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}
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/**
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* A watcher keeps track of one child execution
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*/
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export class Watcher {
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private smartshellInstance = new plugins.smartshell.Smartshell({
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executor: 'bash'
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});
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private currentExecution: plugins.smartshell.IExecResultStreaming;
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private smartchokWatcher = new plugins.smartchok.Smartchok([], {});
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private options: IWatcherConstructorOptions;
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constructor(optionsArg: IWatcherConstructorOptions) {
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this.options = optionsArg;
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}
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/**
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* start the file
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*/
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public async start() {
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this.setupCleanup();
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console.log(`Looking at ${this.options.filePathToWatch} for changes`);
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this.smartchokWatcher.add([this.options.filePathToWatch]); // __dirname refers to the directory of this very file
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await this.smartchokWatcher.start();
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const changeObservable = await this.smartchokWatcher.getObservableFor('change');
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changeObservable.subscribe(() => {
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this.updateCurrentExecution();
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});
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this.updateCurrentExecution();
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}
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/**
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* updates the current execution
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*/
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private async updateCurrentExecution() {
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if (this.currentExecution) {
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logger.log('ok', `reexecuting ${this.options.commandToExecute}`);
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process.kill(-this.currentExecution.childProcess.pid);
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} else {
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logger.log('ok', `executing ${this.options.commandToExecute} for the first time`);
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}
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this.currentExecution = await this.smartshellInstance.execStreaming(
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this.options.commandToExecute
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);
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this.currentExecution = null;
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}
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/**
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* this method sets up a clean exit strategy
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*/
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private async setupCleanup() {
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const cleanup = () => {
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if (this.currentExecution) {
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process.kill(-this.currentExecution.childProcess.pid);
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}
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};
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process.on('exit', () => {
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console.log('');
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console.log('now exiting!');
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cleanup();
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process.exit(0);
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});
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process.on('SIGINT', () => {
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console.log('');
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console.log('ok! got SIGINT We are exiting! Just cleaning up to exit neatly :)');
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cleanup();
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process.exit(0);
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});
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// handle timeout
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if (this.options.timeout) {
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plugins.smartdelay.delayFor(this.options.timeout).then(() => {
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console.log(`timed out afer ${this.options.timeout} milliseconds! exiting!`);
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cleanup();
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process.exit(0);
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});
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}
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}
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/**
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* stops the watcher
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*/
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public async stop() {
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await this.smartchokWatcher.stop();
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if (this.currentExecution) {
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process.kill(-this.currentExecution.childProcess.pid);
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}
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}
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}
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