openchain-sdk-yxl-ts/lib/common/operation/createLog.js

OpenChain SDK for browser

import protobuf from 'protobufjs';
import toUint8Array from '../buffer-utils.js';
import bundleJson from '../../crypto/protobuf/bundle.js';

/**
 * log operation: Create Log
 * @param {string} args
 * @returns {string}
 */
export default function (args) {
  try {
    const { sourceAddress, topic, data, metadata } = args;
    const root = protobuf.Root.fromJSON(bundleJson);
    const log = root.lookupType('protocol.OperationLog');
    const logMsg = log.create({
      topic,
      datas: [data],
    });

    const operation = root.lookupType('protocol.Operation');
    const payload = {
      log: logMsg,
      type: operation.Type.LOG,
      sourceAddress,
    };

    if (metadata) {
      payload.metadata = toUint8Array(Buffer.from(metadata, 'utf8'));
    }

    const err = operation.verify(payload);

    if (err) {
      throw Error(err);
    }

    return operation.create(payload);
  } catch (err) {
    throw err;
  }
};