@atomiqlabs/sdk/src/http/paramcoders/ParamEncoder.ts

atomiq labs SDK for cross-chain swaps between smart chains and bitcoin

import {Buffer} from "buffer";

export class ParamEncoder {

    private readonly writeFN: (data: Buffer) => Promise<void>;
    private readonly endFN: () => Promise<void>;

    constructor(write: (data: Buffer) => Promise<void>, end: () => Promise<void>) {
        this.writeFN = write;
        this.endFN = end;
    }

    /**
     * Write a set of parameters to the underlying sink
     *
     * @param data
     */
    writeParams(data: {[key: string]: any}): Promise<void> {
        const serialized: Buffer = Buffer.from(JSON.stringify(data));

        const frameLengthBuffer = Buffer.alloc(4);
        if(frameLengthBuffer.writeUint32LE!=null) {
            frameLengthBuffer.writeUint32LE(serialized.length);
        } else {
            frameLengthBuffer.writeUInt32LE(serialized.length);
        }

        return this.writeFN(Buffer.concat([
            frameLengthBuffer,
            serialized
        ]));
    }

    /**
     * Cancels the underlying sink and encoder
     */
    end(): Promise<void> {
        return this.endFN();
    }

}