@hazae41/kcp/dist/esm/mods/kcp/writer/index.mjs

Zero-copy KCP protocol for the web

import { Future } from '@hazae41/future';
import { KcpSegment } from '../segment/index.mjs';

class SecretKcpWriter {
    parent;
    constructor(parent) {
        this.parent = parent;
    }
    async onWrite(fragment) {
        const { lowDelay = 300, highDelay = 3000 } = this.parent.params;
        const conversation = this.parent.conversation;
        const command = KcpSegment.commands.push;
        const serial = this.parent.sendCounter++;
        const unackSerial = this.parent.recvCounter;
        const segment = KcpSegment.newOrThrow({ conversation, command, serial, unackSerial, fragment });
        this.parent.output.enqueue(segment);
        const start = Date.now();
        const retry = setInterval(() => {
            if (this.parent.closed) {
                clearInterval(retry);
                return;
            }
            const delay = Date.now() - start;
            if (delay > highDelay) {
                clearInterval(retry);
                return;
            }
            this.parent.output.enqueue(segment);
        }, lowDelay);
        const { resolveOnClose, resolveOnError } = this.parent;
        const resolveOnAck = new Future();
        Promise
            .race([resolveOnAck.promise, resolveOnClose.promise, resolveOnError.promise])
            .finally(() => clearInterval(retry));
        this.parent.resolveOnAckBySerial.set(serial, resolveOnAck);
    }
}

export { SecretKcpWriter };
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