SubstraHooks is a collection of useful react hooks that work with polkadot.js on substrate blockchains
inspired by useDApp
Add it to your project:
yarn add @substra-hooks/core
Use it in your React app:
import React from 'react'
import { SubstraHooksProvider } from '@substra-hooks/core';
export enum NETWORKS {
kusama = 'kusama',
statemine = 'statemine',
}
const apiProviderConfig = {
[NETWORKS.kusama]: {
id: NETWORKS.kusama,
wsProviderUrl: 'wss://kusama-rpc.polkadot.io',
},
[NETWORKS.statemine]: {
id: NETWORKS.statemine,
wsProviderUrl: 'wss://kusama-statemine-rpc.paritytech.net',
},
}
// Wrap everything in <SubstraHooksProvider />
export default () => (
<SubstraHooksProvider apiProviderConfig={apiProviderConfig} defaultApiProviderId={NETWORKS.kusama}>
<App />
</SubstraHooksProvider>
)
// App.tsx
import React from 'react'
import { useAccountBalance, useSystemProperties, useAssetBalance } from '@substra-hooks/core'
const App = () => {
const { accounts, w3enable, w3Enabled } = usePolkadotExtension();
const { balanceFormatted } = useAccountBalance(accounts?.[0]?.address || '');
const assetPayload = useAssetBalance(accounts?.[0]?.address || '', 8, NETWORKS.statemine);
const systemProperties = useSystemProperties()
console.log('systemProperties', systemProperties)
useEffect(() => {
if (!w3Enabled) {
w3enable();
}
}, [w3Enabled])
console.log('accounts', accounts)
console.log('balanceFormatted', accounts?.[5]?.address || '', balanceFormatted);
console.log('assetPayload', assetPayload);
return (
<>
<h1>Balance</h1>
{balanceFormatted && (
<div>{balanceFormatted}</div>
)}
</>
)
}
If your app is using SSR (i.e. next.js) then you need to dynamically import Provider with no SSR, create your own local Provider first
import { ReactNode } from 'react';
import { SubstraHooksProvider } from '@substra-hooks/core';
interface ISubstraHooksProviderProps {
apiProviderConfig: ApiProviderConfig;
children: ReactNode;
}
const SubstraHooksProviderSSR = ({ apiProviderConfig, children }: ISubstraHooksProviderProps) => {
return (
<SubstraHooksProvider
apiProviderConfig={apiProviderConfig}
defaultApiProviderId={NETWORKS.kusama}>
{children}
</SubstraHooksProvider>
);
};
export default SubstraHooksProviderSSR;
const SubstraHooksProviderSSR = dynamic(() => import('./substra-hook-provider'), {
ssr: false,
});
const MyApp = ({ Component, pageProps }: AppProps) => {
return (
<SubstraHooksProviderSSR wsProviderUrl="wss://kusama-rpc.polkadot.io">
<Component {...pageProps} />
</SubstraHooksProviderSSR>
);
};
export default MyApp;
Main Provider that includes ExtensionProvider
Provider that mainly deals with polkadot browser extension
Returns polkadot.js ApiPromise
. Returns default ApiPromise
as defined by defaultApiProviderId
on SubstraHooksProvider, additional argument can be passed to return different ApiPromise
from default one
const polkadotStatemineApi = useApiProvider('statemine');
Returns parsed results of polkadotApi.rpc.system.properties
API in following format.
{
tokenDecimals: number;
tokenSymbol: string;
ss58Format: number;
}
Returns system properties fetched from the chain connected by your default api provider, additional argument can be passed to return different system properties from different node
const systemProperties = useSystemProperties()
Returns token balance of given address from the default node.
const { balanceFormatted, balanceRaw } = useAccountBalance(userEncodedAddress);
Returns balance of specified asset id for given address from the default node.
const { balanceFormatted, balanceRaw } = useAssetBalance(
userEncodedAddress,
ASSET_ID,
'statemine',
);
Returns substrate address in a format of ss58Format
of your default chain node
const ownerAddressEncoded = useEncodedAddress(owner);
import {useEffect} from "react";
...
const { w3Enabled, w3enable, accounts } = usePolkadotExtension();
const initialise = () => {
if (!w3Enabled) {
w3enable();
}
};
useEffect(() => {
if (!w3Enabled) {
initialise();
}
}, [w3Enabled])
console.log(accounts);