Sending the EVM smart contract function call via a transaction

You can send the EVM smart contract function call via a transaction. To do this:

1. Revert the index.js file to its initial state, described here.

2. Replace the first line in the file:

   import { NetworkApi, WalletApi } from '@thepowereco/tssdk';

   with:

   import { NetworkApi, WalletApi, TransactionsApi, EvmApi } from '@thepowereco/tssdk';

3. Add the following line to the file:

   import greeterAbi from './greeter_sol_Greeter.json' assert { type: "json" };

   This line imports the data from the .abi smart contract file, you have generated before. This data is used to automatically convert requests to smart contract.

   The file will look like this:

   import { NetworkApi, WalletApi, TransactionsApi, EvmApi } from '@thepowereco/tssdk';
   import {readFileSync} from 'fs';
   import greeterAbi from './greeter_sol_Greeter.json' assert { type: "json" };
   
   //load account data from file
   const importNetworkApi = new NetworkApi(1025);
   const importWalletApi = new WalletApi(importNetworkApi);
   let password='111';
   const importedData = readFileSync("example.pem");
   const importedWallet = await importWalletApi.parseExportData(importedData.toString(), password);
   console.log('import data',importedWallet);
   
   //load balance for account
   const letNetworkApi = new NetworkApi(1025);
   await letNetworkApi.bootstrap();
   let subChain = await letNetworkApi.getAddressChain(importedWallet.address);
   const networkApi = new NetworkApi(subChain.chain);
   await networkApi.bootstrap();
   const walletApi = new WalletApi(networkApi);
   const accountData= await walletApi.loadBalance(importedWallet.address);
   console.log('accountData',accountData)
   
   //call function from smart-contract
   const storageSc = await EvmApi.build(importedWallet.address, subChain.chain, greeterAbi);
   const greetMessage = await storageSc.scGet(
   'greet',
   [],
   );
   console.log(greetMessage);

4. Add the following code to the file:

   //send a smart-contract function call
   const storageSc = await EvmApi.build(importedWallet.address, subChain.chain, greeterAbi);
   
   const resSet = await storageSc.scSet(
   importedWallet,
   'setGreeting',
   ['New hello!'],
   );
   console.log(resSet);

5. Start the code by running the following command:

   node index.js

As a result, you will see the transaction result message. If the transaction is successful, you will see the following output:

dcloud_example % node index.js
(node:98047) ExperimentalWarning: Importing JSON modules is an experimental feature and might change at any time
(Use `node --trace-warnings ...` to show where the warning was created)
import data {
  address: 'AA100001733086414002',
  wif: 'KywHx4qhG49JEms15jmgXDGMq7xKkmhQSpiZihWi5bbvL8QvjyUD'
}
accountData {
  amount: { SK: 103104498.44 },
  code: 1660,
  contract: [ 'evm', 'EVM' ],
  lastblk: '298295D8FC695B41DED607F3AD1A88AA3930D245979BD2054B43D8DB4C45A5B4',
  preblk: '1B58AF728AB74C87B0E56CE99C1D118B8F983620E9C0F656AE19ACFD677BBA1B',
  pubkey: '0207FE4A91CE18E398B8BF7DF7B3BF13D99712C1DB8F3FA856E43C9839452424E1',
  seq: 1674467848612,
  state: 1,
  t: 1674467848612,
  usk: 2,
  view: [],
  vm: 'evm'
}
Transaction result: { txId: '3VWqJnn2Y47RVhhgC-c1033.debobus', res: 'ok' }
undefined

Note

If you will try to repeat the code described in the section above, in the console you will see the following output:

dcloud_example % node index.js
(node:32365) ExperimentalWarning: Importing JSON modules is an experimental feature and might change at any time
(Use `node --trace-warnings ...` to show where the warning was created)
import data {
  address: 'AA100001733086414002',
  wif: 'KywHx4qhG49JEms15jmgXDGMq7xKkmhQSpiZihWi5bbvL8QvjyUD'
}
accountData {
  amount: { SK: 102124485.94 },
  code: 1660,
  contract: [ 'evm', 'EVM' ],
  lastblk: '789A6495C33679AF46333257CE44D1501566578FEC517AC8222CD0611CE9573E',
  preblk: '298295D8FC695B41DED607F3AD1A88AA3930D245979BD2054B43D8DB4C45A5B4',
  pubkey: '0207FE4A91CE18E398B8BF7DF7B3BF13D99712C1DB8F3FA856E43C9839452424E1',
  seq: 1674467952302,
  state: 1,
  t: 1674467952302,
  usk: 3,
  view: [],
  vm: 'evm'
}
New hello!

As you can see, The result of a local function call is "New hello!" instead of a classic "Hello World!".