Create a digital twin

createTwin.js

// require blockchain-core dependencies
const IpfsApi = require('ipfs-api');
const Web3 = require('web3');

// require blockchain-core
const { Ipfs, createDefaultRuntime, PropertyType, ModificationType } = require('@evan.network/api-blockchain-core');

// ipfs configuration for evan.network testnet storage
const ipfsConfig = {host: 'ipfs.test.evan.network', port: '443', protocol: 'https'};
// web3 provider config (currently evan.network testcore)
const web3Provider = 'wss://testcore.evan.network/ws'


const runtimeConfig = {
  // account map to blockchain accounts with their private key
  accountMap: {
    '0x4D15A20Fb7337776a8009e274C5fe9f2433E284B':
      '820ac7018f3a352f18528026880de11894f807cb9b4ea3c838d780a123ba6a17',
  },
  // key configuration for private data handling
  keyConfig: {
    '0x4D15A20Fb7337776a8009e274C5fe9f2433E284B': 'Test1234',
  },
  // ipfs configuration for evan.network storage
  ipfs: {host: 'ipfs.test.evan.network', port: '443', protocol: 'https'},
  // web3 provider config (currently evan.network testcore)
  web3Provider: 'wss://testcore.evan.network/ws',
};


async function init() {
  // initialize dependencies
  const provider = new Web3.providers.WebsocketProvider(
    runtimeConfig.web3Provider,
    { clientConfig: { keepalive: true, keepaliveInterval: 5000 } });
  const web3 = new Web3(provider, { transactionConfirmationBlocks: 1 });
  const dfs = new Ipfs({ remoteNode: new IpfsApi(runtimeConfig.ipfs), });

  // create runtime
  const runtime = await createDefaultRuntime(web3, dfs, { accountMap: runtimeConfig.accountMap, keyConfig: runtimeConfig.keyConfig });

  return runtime;
}


async function createTwin(runtime) {
  const contract = await runtime.dataContract.create('testdatacontract', runtime.activeAccount);
  console.log('contract created');
  await runtime.rightsAndRoles.setOperationPermission(
    contract,                   // contract to be updated
    runtime.activeAccount,              // account, that can change permissions
    0,                 // role id, uint8 value
    'metadata',                  // name of the object
    PropertyType.Entry,     // what type of element is modified
    ModificationType.Set,       // type of the modification
    true,                       // grant this capability
  );
  console.log('rights set for field metadata')
  const metadata = {
    "weight": "100t",
    "height": "2,5m",
    "type": "exvacator"
  };
  await runtime.dataContract.setEntry(contract, 'metadata', metadata, runtime.activeAccount);
}

async function updateTwin(runtime, address) {
  const contract = runtime.contractLoader.loadContract('DataContract', address);

 await runtime.rightsAndRoles.setOperationPermission(
    contract,                   // contract to be updated
    runtime.activeAccount,              // account, that can change permissions
    0,                 // role id, uint8 value
    'rentalCalender',                  // name of the object
    PropertyType.ListEntry,     // what type of element is modified
    ModificationType.Set,       // type of the modification
    true,                       // grant this capability
  );

  const rentalEntry = {
    from: Date.now(),
    to: Date.now() + 100 * 60 * 60 * 24
  };

  await runtime.dataContract.addListEntries(contract, 'rentalCalender', [rentalEntry], runtime.activeAccount);

}

async function updateTwin2(runtime, address) {
  const contract = runtime.contractLoader.loadContract('DataContract', address);

 await runtime.rightsAndRoles.setOperationPermission(
    contract,                   // contract to be updated
    runtime.activeAccount,              // account, that can change permissions
    0,                 // role id, uint8 value
    'workingHours',                  // name of the object
    PropertyType.Entry,     // what type of element is modified
    ModificationType.Set,       // type of the modification
    true,                       // grant this capability
  );


  await runtime.dataContract.setEntry(contract, 'workingHours', '0x1', runtime.activeAccount, false, false, 'unencrypted');

}

async function getValue(runtime, address) {

  const contract = runtime.contractLoader.loadContract('DataContract', address);
  const metadata = await runtime.dataContract.getEntry(contract, 'metadata', runtime.activeAccount)

  console.dir(metadata)
}

init().then(async (runtime) => {

   const twinAdress = await createTwin(runtime)
   await updateTwin(runtime, twinAdress);
   await updateTwin2(runtime, twinAdress)
   await getValue(runtime, twinAdress);
   console.log('Twin created ' + twinAdress);
});