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import { open, File, Writer } from "deno";
import { getLevelByName } from "./levels.ts";
import { LogRecord } from "./logger.ts";
export class BaseHandler {
level: number;
levelName: string;
constructor(levelName: string) {
this.level = getLevelByName(levelName);
this.levelName = levelName;
}
handle(logRecord: LogRecord) {
if (this.level > logRecord.level) return;
// TODO: implement formatter
const msg = `${logRecord.levelName} ${logRecord.msg}`;
return this.log(msg);
}
log(msg: string) {}
async setup() {}
async destroy() {}
}
export class ConsoleHandler extends BaseHandler {
log(msg: string) {
console.log(msg);
}
}
export abstract class WriterHandler extends BaseHandler {
protected _writer: Writer;
log(msg: string) {
const encoder = new TextEncoder();
// promise is intentionally not awaited
this._writer.write(encoder.encode(msg + "\n"));
}
}
export class FileHandler extends WriterHandler {
private _file: File;
private _filename: string;
constructor(levelName: string, filename: string) {
super(levelName);
this._filename = filename;
}
async setup() {
// open file in append mode - write only
this._file = await open(this._filename, "a");
this._writer = this._file;
}
async destroy() {
await this._file.close();
}
}
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