pinetto/dist/writers/buffered.js

Isomorphic, opinionated logging library focusing on simplicity and readability. Supports child loggers.

import { EMPTY, RESOLVED, IS_NODE, EOL } from '../constants.js';
export class BufferedWriter {
    #buffer;
    #timeout;
    #flushing;
    #write;
    #maxBufferLength;
    #flushTimeout;
    constructor(opts = EMPTY) {
        this.#buffer = '';
        this.#timeout = null;
        this.#flushing = false;
        this.#maxBufferLength = typeof opts.maxBufferLength === 'number' ? opts.maxBufferLength : 8192;
        this.#flushTimeout = typeof opts.maxBufferLength === 'number' ? opts.flushTimeout : 250;
        this._flush = this._flush.bind(this);
        this.#write = IS_NODE
            ? (entry) => {
                process.stdout.write(entry);
                process.stdout.write(EOL.value);
            }
            : console.log.bind(console);
    }
    _flush() {
        this.#write(this.#buffer);
        this.#buffer = '';
        if (this.#timeout) {
            clearTimeout(this.#timeout);
            this.#timeout = null;
        }
        this.#flushing = false;
    }
    write(entry) {
        this.#buffer += entry + EOL.value;
        if (!this.#flushing) {
            if (this.#buffer.length >= this.#maxBufferLength) {
                this.#flushing = true;
                RESOLVED.then(this._flush);
            }
            else if (this.#timeout === null) {
                this.#flushing = true;
                this.#timeout = setTimeout(this._flush, this.#flushTimeout);
            }
        }
    }
}
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