feat: Initial clean release of CHM

packages/lib/RotatingLogs.ts

@@ -0,0 +1,47 @@
+import shim from './shim';
+import { Stat } from './fs-driver-base';
+
+export default class RotatingLogs {
+
+	private logFilesDir: string;
+	private maxFileSize: number = 1024 * 1024 * 100;
+	private inactiveMaxAge: number = 90 * 24 * 60 * 60 * 1000;
+
+	public constructor(logFilesDir: string, maxFileSize: number = null, inactiveMaxAge: number = null) {
+		this.logFilesDir = logFilesDir;
+		if (maxFileSize) this.maxFileSize = maxFileSize;
+		if (inactiveMaxAge) this.inactiveMaxAge = inactiveMaxAge;
+	}
+
+	public async cleanActiveLogFile() {
+		const stats: Stat = await this.fsDriver().stat(this.logFileFullpath());
+		if (stats.size >= this.maxFileSize) {
+			const newLogFile: string = this.logFileFullpath(this.getNameToNonActiveLogFile());
+			await this.fsDriver().move(this.logFileFullpath(), newLogFile);
+		}
+	}
+
+	private getNameToNonActiveLogFile(): string {
+		return `log-${Date.now()}.txt`;
+	}
+
+	public async deleteNonActiveLogFiles() {
+		const files: Stat[] = await this.fsDriver().readDirStats(this.logFilesDir);
+		for (const file of files) {
+			if (!file.path.match(/^log-[0-9]+.txt$/gi)) continue;
+			const timestamp: number = parseInt(file.path.match(/[0-9]+/g)[0], 10);
+			const ageOfTheFile: number = Date.now() - timestamp;
+			if (ageOfTheFile >= this.inactiveMaxAge) {
+				await this.fsDriver().remove(this.logFileFullpath(file.path));
+			}
+		}
+	}
+
+	private logFileFullpath(fileName = 'log.txt'): string {
+		return `${this.logFilesDir}/${fileName}`;
+	}
+
+	private fsDriver() {
+		return shim.fsDriver();
+	}
+}