Description

The Web3Games-JS API provides a set of utilities, libraries and tools that enable JavaScript applications to interact with smart contracts or pallets running in the Web3Games network via queries to a Web3Games node.

Installation

npm install @web3games-js/api

or

yarn add @web3games-js/api

---

Getting started

Start an API connection to a running node on localhost:

import { Web3GamesApi } from '@web3games-js/api';

const Web3GamesApi = await Web3GamesApi.create();

You can also connect to a different node:

const Web3GamesApi = await Web3GamesApi.create({ providerAddress: 'wss://devnet.web3games.org/' });

Getting node info:

const chain = await Web3GamesApi.chain();
const nodeName = await Web3GamesApi.nodeName();
const nodeVersion = await Web3GamesApi.nodeVersion();
const genesis = Web3GamesApi.genesisHash.toHex();

---

Payloads and metadata

Encode / decode payloads

It's necessary to send only bytes to interact with programs on blockchain. For that purpose we use the scale-codec implementation from @polkadot-js

You can use static CreateType.create method to encode and decode data

Example

import { CreateType } from '@web3games-js/api';

// If "TypeName" alredy registred
const result = CreateType.create('TypeName', somePayload);
// Otherwise need to add metadata containing TypeName and all required types
const result = CreateType.create('TypeName', somePayload, metadata);

Result of this functions is data of type Codec and it has the next methods

result.toHex(); // - returns a hex represetation of the value
result.toHuman(); // - returns human friendly object representation of the value
result.toString(); //  - returns a string represetation of the value
result.toU8a(); // - encodes the value as a Unit8Array
result.toJSON(); // - converts the value to JSON

---

Events

Subscribe to all events

Example

const unsub = await Web3GamesApi.query.system.events((events) => {
  console.log(events.toHuman());
});
// Unsubscribe
unsub();

---

Blocks

Get block data

Example

const data = await Web3GamesApi.blocks.get(blockNumberOrBlockHash);
console.log(data.toHuman());

Get block timestamp

Example

const ts = await Web3GamesApi.blocks.getBlockTimestamp(blockNumberOrBlockHash);
console.log(ts.toNumber());

Get blockHash by block number

Example

const hash = await Web3GamesApi.blocks.getBlockHash(blockNumber);
console.log(hash.toHex());

Get block number by blockhash

Example

const hash = await Web3GamesApi.blocks.getBlockNumber(blockHash);
console.log(hash.toNumber());

Get all block's events

Example

const events = await Web3GamesApi.blocks.getEvents(blockHash);
events.forEach((event) => {
  console.log(event.toHuman());
});

Get all block's extrinsics

Example

const extrinsics = await Web3GamesApi.blocks.getExtrinsics(blockHash);
extrinsics.forEach((extrinsic) => {
  console.log(extrinsic.toHuman());
});

---

Keyring

Create keyring

To create keyring you can use static methods of Web3GamesKeyring class.

Example

• Creating a new keyring

import { Web3GamesKeyring } from '@web3games-js/api';
const { keyring, json } = await Web3GamesKeyring.create('keyringName', 'passphrase');

• Getting a keyring from JSON

const jsonKeyring = fs.readFileSync('path/to/keyring.json').toString();
const keyring = Web3GamesKeyring.fromJson(jsonKeyring, 'passphrase');

• Getting JSON for keyring

const json = Web3GamesKeyring.toJson(keyring, 'passphrase');

• Getting a keyring from seed

const seed = '0x496f9222372eca011351630ad276c7d44768a593cecea73685299e06acef8c0a';
const keyring = await Web3GamesKeyring.fromSeed(seed, 'name');

• Getting a keyring from mnemonic

const mnemonic = 'slim potato consider exchange shiver bitter drop carpet helmet unfair cotton eagle';
const keyring = Web3GamesKeyring.fromMnemonic(mnemonic, 'name');

• Generate mnemonic and seed

const { mnemonic, seed } = Web3GamesKeyring.generateMnemonic();

// Getting a seed from mnemonic
const { seed } = Web3GamesKeyring.generateSeed(mnemonic);

Sign data

Example

1. Create signature

import { Web3GamesKeyring } from '@web3games-js/api';
const message = 'your message';
const signature = Web3GamesKeyring.sign(keyring, message);

2. Validate signature

import { signatureIsValid } from '@web3games-js/api';
const publicKey = keyring.address;
const verified = signatureIsValid(publicKey, signature, message);

Convert public keys into ss58 format and back

Use encodeAddress and decodeAddress functions to convert the public key into ss58 format and back.

Example

1. Convert to raw format

import { decodeAddress } from '@web3games-js/api';
console.log(decodeAddress('5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY'))

2. Convert to ss58 format

import { encodeAddress } from '@web3games-js/api';
console.log(encodeAddress('0xd43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d'))