The Dart SDK for Terra

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Terra-dart is a Dart SDK for writing applications that interact with the Terra blockchain from either the Web or Mobile, or Flutter environments and provides simple abstractions over core data structures, serialization, key management, and API request generation.

Features

  • Written in Dart, with type definitions
  • Versatile support for key management solutions
  • Works with Flutter, in the browser, and Mobile
  • Exposes the Terra API through LCDClient
  • Parses responses into native Dart types

We highly suggest using terra-dart in a code editor that has support for type declarations, so you can take advantage of the helpful type hints that are included with the package.

Installation

Grab the latest version off NPM:

npm install @terra-money/terra-dart

Usage

terra-dart can be used in Node.js, as well as inside the browser. Please check the docs for notes on how to get up and running.

Getting blockchain data

❗ terra-dart can connect both terra-classic and terra network. If you want to communicate with classic chain, you have to set isClassic as true.

import { LCDClient, Coin } from '@terra-money/terra-dart';

// connect to pisco testnet
const terra = new LCDClient({
  URL: 'https://pisco-lcd.terra.dev',
  chainID: 'pisco-1',
  isClassic: false  // if it is unset, LCDClient assumes the flag is false.
});

// connect to columbus-5 terra classic network
const terra = new LCDClient({
  URL: 'https://columbus-lcd.terra.dev',
  chainID: 'columbus-5',
  isClassic: true  // *set to true to connect terra-classic chain*
});

// To use LocalTerra
// const terra = new LCDClient({
//   URL: 'http://localhost:1317',
//   chainID: 'localterra'
// });

// get the current balance of `terra1x46rqay4d3cssq8gxxvqz8xt6nwlz4td20k38v`
const balance = terra.bank.balance('terra1x46rqay4d3cssq8gxxvqz8xt6nwlz4td20k38v');
console.log(balance);

Broadcasting transactions

First, get some testnet tokens for terra1x46rqay4d3cssq8gxxvqz8xt6nwlz4td20k38v, or use LocalTerra.

import { LCDClient, MsgSend, MnemonicKey } from '@terra-money/terra-dart';

// create a key out of a mnemonic
const mk = new MnemonicKey({
  mnemonic:
    'notice oak worry limit wrap speak medal online prefer cluster roof addict wrist behave treat actual wasp year salad speed social layer crew genius',
});

// connect to bombay testnet
const terra = new LCDClient({
  URL: 'https://pisco-lcd.terra.dev',
  chainID: 'pisco-1',
});

// To use LocalTerra
// const terra = new LCDClient({
//   URL: 'http://localhost:1317',
//   chainID: 'localterra'
// });

// a wallet can be created out of any key
// wallets abstract transaction building
const wallet = terra.wallet(mk);

// create a simple message that moves coin balances
const send = new MsgSend(
  'terra1x46rqay4d3cssq8gxxvqz8xt6nwlz4td20k38v',
  'terra17lmam6zguazs5q5u6z5mmx76uj63gldnse2pdp',
  { uluna: 1200000}
);

wallet
  .createAndSignTx({
    msgs: [send],
    memo: 'test from terra-dart!',
  })
  .then(tx => terra.tx.broadcast(tx))
  .then(result => {
    console.log(`TX hash: ${result.txhash}`);
  });

terra-dart in the browser

You can access all the objects of the @terra-money/terra-dart from the global Terra object if you load terra-dart with a <script> tag.

Include the following in your browser:

<script
  crossorigin
  src="https://unpkg.com/@terra-money/terra-dart/dist/bundle.js"
></script>

You can find a small JSFiddle example that refreshes current Oracle votes here.

terra-dart in React Native

In order to use terra-dart inside React Native, you need to add the node-libs-react-native package and react-native-get-random-values package to your React Native app’s package.json.

yarn add node-libs-react-native react-native-get-random-values

You will need to register Node.js native modules in an entry point of your application, such as index.tsx:

import 'node-libs-react-native/globals';
import 'react-native-get-random-values';

Also, add resolvers to your metro.config.js

module.exports {
  // ...
  resolver: {
    // ...
    extraNodeModules: require('node-libs-react-native'),
  },
  // ...
}

License

This software is licensed under the MIT license. See LICENSE for full disclosure.

© 2020 Terraform Labs, PTE.

Powering the innovation of money.

GitHub

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