Harmony

Installation

Magic interacts with the Harmony blockchain via Magic's extension NPM package @magic-ext/harmony. The Harmony extension also lets you interact with the blockchain using methods from Harmony's Javascript SDK.

note

You can skip straight to our kitchen sink example directly:

👉 Harmony Example

npm install --save @magic-ext/harmony

Initializing Extension

import { Magic } from 'magic-sdk';
import { HarmonyExtension } from '@magic-ext/harmony';
const { Harmony: Index } = require('@harmony-js/core');
const { ChainID, ChainType } = require('@harmony-js/utils');
const magic = new Magic('YOUR_API_KEY', {
extensions: [
new HarmonyExtension({
rpcUrl: 'https://api.s0.b.hmny.io',
chainId: ChainID.HmyTestnet
})
]
});

Send Transaction

Getting Test ONE token

Before you can send transaction on the Harmony blockchain, you'll need to acquire some test ONE token (Harmony's native cryptocurrency for test network).

  1. Go to our Harmony Example application
  2. Login with your email address
  3. Copy your Harmony public address
  4. Go to the Harmony Faucet
  5. Paste your copied Harmony public address in the text input
  6. Now you can use your test ONE token in our example app

Call Extension Method

Note that the Magic Harmony extension follows the method names and conventions by Harmony's Javascript SDK. To send a standard Harmony blockchain transaction, you can call the magic.harmony.sendTransaction method.

import { Magic } from 'magic-sdk';
import { HarmonyExtension } from '@magic-ext/harmony';
const { Harmony: Index } = require('@harmony-js/core');
const { ChainID, ChainType } = require('@harmony-js/utils');
const magic = new Magic('YOUR_API_KEY', {
extensions: [
new HarmonyExtension({
rpcUrl: 'https://api.s0.b.hmny.io',
chainId: ChainID.HmyTestnet
})
]
});
const params = {
// token send to
to: 'one1jzxhswufkh7wgyq7s49u3rvp9vlts8wcwsq8y2',
// amount to send
value: '50000',
// gas limit, you can use string
gasLimit: '210000',
// send token from shardID
shardID: 0,
// send token to toShardID
toShardID: 0,
// gas Price, you can use Unit class, and use Gwei, then remember to use toWei(), which will be transformed to BN
gasPrice: 1000000000,
};
const txHash = await magic.harmony.sendTransaction(params);
console.log('transaction hash', txHash)

Smart Contract

Deploy Contract

Getting Test ONE token

Before you can send transaction on the Harmony blockchain, you'll need to acquire some test ONE token (Harmony's native cryptocurrency for test network).

  1. Go to our Harmony Example application
  2. Login with your email address
  3. Copy your Harmony public address
  4. Go to the Harmony Faucet
  5. Paste your copied Harmony public address in the text input
  6. Now you can use your test ONE token in our example app
Call Extension Method

Note that the Magic Harmony extension follows the method names and conventions by Harmony's Javascript SDK. To deploy an Harmony smart contract, you can call the magic.harmony.sendTransaction method to send deploy contract transaction.

import { Magic } from 'magic-sdk';
import { HarmonyExtension } from '@magic-ext/harmony';
const { Harmony: Index } = require('@harmony-js/core');
const { ChainID, ChainType } = require('@harmony-js/utils');
const magic = new Magic('YOUR_API_KEY', {
extensions: [
new HarmonyExtension({
rpcUrl: 'https://api.s0.b.hmny.io',
chainId: ChainID.HmyTestnet
})
]
});
const bin = '608060405234801561001057600080fd5b5060c68061001f6000396000f3fe6080604052348015600f576000' +
'80fd5b506004361060325760003560e01c80636057361d146037578063b05784b8146062575b600080fd5b6060600480' +
'36036020811015604b57600080fd5b8101908080359060200190929190505050607e565b005b60686088565b60405180' +
'82815260200191505060405180910390f35b8060008190555050565b6000805490509056fea265627a7a723158209e86' +
'9bf97eba094ccf7533f0f92b4de32cf3cce7d7cff974769bca975e178b0164736f6c63430005110032';
const contractBytecode = {
data: `0x${bin}`,
gasLimit: '210000',
// send token from shardID
shardID: 0,
// send token to toShardID
toShardID: 0,
// gas Price, you can use Unit class, and use Gwei, then remember to use toWei(), which will be transformed to BN
gasPrice: 1000000000,
arguments: []
};
const txHash = await magic.harmony.sendTransaction(contractBytecode);
console.log('transaction hash', txHash)

Contract Send

Getting Test ONE token

Before you can send transaction on the Harmony blockchain, you'll need to acquire some test ONE token (Harmony's native cryptocurrency for test network).

  1. Go to our Harmony Example application
  2. Login with your email address
  3. Copy your Harmony public address
  4. Go to the Harmony Faucet
  5. Paste your copied Harmony public address in the text input
  6. Now you can use your test ONE token in our example app
Call Extension Method

Note that the Magic Harmony extension follows the method names and conventions by Harmony's Javascript SDK. To call an Harmony smart contract function, you can call the magic.harmony.sendTransaction method to send contract transaction.

import { Magic } from 'magic-sdk';
import { HarmonyExtension } from '@magic-ext/harmony';
const { Harmony: Index } = require('@harmony-js/core');
const { ChainID, ChainType } = require('@harmony-js/utils');
const magic = new Magic('YOUR_API_KEY', {
extensions: [
new HarmonyExtension({
rpcUrl: 'https://api.s0.b.hmny.io',
chainId: ChainID.HmyTestnet
})
]
});
const harmony = new Index(
// rpc url
'https://api.s0.b.hmny.io',
{
// chainType set to Index
chainType: ChainType.Harmony,
// chainType set to HmyLocal
chainId: ChainID.HmyTestnet,
},
);
let contractAddress = "0x67a3f8db0c98524e8e4513f95cd68f7fbbca7f06";
const contractAbi = [
{
"constant": false,
"inputs": [
{
"internalType": "uint256",
"name": "num",
"type": "uint256"
}
],
"name": "store",
"outputs": [],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "retreive",
"outputs": [
{
"internalType": "uint256",
"name": "",
"type": "uint256"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
}
];
const deployedContract = harmony.contracts.createContract(
contractAbi,
contractAddress
);
const tx = await deployedContract.methods.store(900);
let { txPayload } = tx.transaction;
txPayload.from = (await magic.user.getMetadata()).publicAddress;
txPayload.gasLimit = '210000';
txPayload.gasPrice = '1000000000';
const txHash = await magic.harmony.sendTransaction(txPayload);
console.log('transaction hash', txHash)
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