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Solana 101: Get Data from Solana Blockchain (From Figment.io's Solana 101 Course)
import type {NextApiRequest, NextApiResponse} from 'next';
import {Connection, PublicKey} from '@solana/web3.js';
import {getNodeURL} from '@figment-solana/lib';
import * as borsh from 'borsh';
// The state of a greeting account managed by the hello world program
class GreetingAccount {
counter = 0;
constructor(fields: {counter: number} | undefined = undefined) {
if (fields) {
this.counter = fields.counter;
}
}
}
// Borsh schema definition for greeting accounts
const GreetingSchema = new Map([
[GreetingAccount, {kind: 'struct', fields: [['counter', 'u32']]}],
]);
export default async function getter(
req: NextApiRequest,
res: NextApiResponse<string | number>,
) {
try {
const {network, greeter} = req.body;
const url = getNodeURL(network);
const connection = new Connection(url, 'confirmed');
const greeterPublicKey = new PublicKey(greeter);
const accountInfo = await connection.getAccountInfo(greeterPublicKey);
if (accountInfo === null) {
throw new Error('Error: cannot find the greeted account');
}
// Find the expected parameters.
const greeting = borsh.deserialize(
GreetingSchema,
GreetingAccount,
accountInfo.data,
);
// A little helper
console.log(greeting);
// Pass the counter to the client-side as JSON
res.status(200).json(greeting.counter);
} catch (error) {
let errorMessage = error instanceof Error ? error.message : 'Unknown Error';
console.log(errorMessage);
res.status(500).json(errorMessage);
}
}
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