zigbee-herdsman/src/adapter/ember/uart/writer.ts

An open source ZigBee gateway solution with node.js.

/* v8 ignore start */

import {Readable, type ReadableOptions} from "node:stream";

// import {logger} from '../../../utils/logger';

// const NS = 'zh:ember:uart:ash:writer';

export class AshWriter extends Readable {
    private bytesToWrite: number[];

    constructor(opts?: ReadableOptions) {
        super(opts);

        this.bytesToWrite = [];
    }

    private writeBytes(): void {
        const buffer = Buffer.from(this.bytesToWrite);
        this.bytesToWrite = [];

        // expensive and very verbose, enable locally only if necessary
        // logger.debug(`>>>> [FRAME raw=${buffer.toString('hex')}]`, NS);

        // this.push(buffer);
        this.emit("data", buffer);
    }

    public writeByte(byte: number): void {
        this.bytesToWrite.push(byte);
    }

    public writeAvailable(): boolean {
        if (this.readableLength < this.readableHighWaterMark) {
            return true;
        }

        this.writeFlush();

        return false;
    }

    /**
     * If there is anything to send, send to the port.
     */
    public writeFlush(): void {
        if (this.bytesToWrite.length) {
            this.writeBytes();
        }
    }

    public override _read(): void {}
}