Kwil

Kwil-JS is a JavaScript/Typescript SDK for building browser and NodeJS applications to interact with Kwil databases.

Version Compatibility

Make sure to use the correct version of the Kwil-JS SDK for the version of the Kwil-DB you are using:

Kwil-JS Version	Kwil-DB Version
v0.9	v0.10
v0.8	v0.9
v0.7	v0.8

Installation

npm i @kwilteam/kwil-js ethers

Initialization

Configure your NodeKwil or WebKwil class by providing the required configurations and any optional configurations.

Browser

import { BrowserProvider } from 'ethers';
import { WebKwil } from '@kwilteam/kwil-js';

// to be used for funding and signing transactions
const provider = new BrowserProvider(window.ethereum)

const kwil = new WebKwil({
    kwilProvider: "kwil_provider_endpoint",
    chainId: "your_kwil_chain_id"
});

NodeJS

const { Wallet } = require('ethers');
const kwiljs = require('@kwilteam/kwil-js');

// to be used for signing transactions
// instead of a provider, nodeJS requires a wallet
const wallet = new Wallet("my_ethereum_private_key")

const kwil = new kwiljs.NodeKwil({
    kwilProvider: "kwil_provider_endpoint",
    chainId: "your_kwil_chain_id"
});

Identifiers

Account Identifiers

In Kwil, accounts are identified by the signer(s) that are used on the Kwil Network. Kwil natively supports two types of signers: Secp256k1 (EVM) and ED25519.

Secp256k1 signers use Ethereum wallet addresses as identifiers. ED25519 signers use the ED25519 public key as identifiers.

Signers

Certain operations in Kwil require signature authentication from the user (e.g. execute action, INSERT/UPDATE/DELETE/CREATE/DROP, transfer funds, etc).

To manage signing, Kwil-JS uses a KwilSigner class. Out of the box, Kwil-JS supports signers from ethers.js (v5 and v6). You can also pass a custom signing callback function (see below).

The account identifier can be passed as a hex string or as bytes.

Browser

import { KwilSigner } from '@kwilteam/kwil-js';
import { BrowserProvider } from 'ethers';

const provider = new BrowserProvider(window.ethereum)
const signer = await provider.getSigner();

// get ethereum address
const identifier = await signer.getAddress();

// create kwil signer
const kwilSigner = new KwilSigner(signer, identifier);

NodeJS

import { KwilSigner } from '@kwilteam/kwil-js';
import { Wallet } from 'ethers';

const signer = new Wallet("my_ethereum_private_key");
const identifier = await signer.getAddress();

// create kwil signer
const kwilSigner = new KwilSigner(signer, identifier);

Writing Data

To write data on Kwil, you can (1) execute an ad-hoc SQL query or (2) execute an action.

Ad-Hoc SQL

If the signer has the required permissions, they can execute ad-hoc SQL queries on the database.

const res = await kwil.execSql(
    'INSERT INTO users (name, age) VALUES ($name, $age)',
    {
        $name: "John Doe",
        $age: 30
    },
    kwilSigner,
    true // set to true to wait for the transaction to be confirmed
)

/*
    res.data = {
        tx_hash: "hash",
    }
*/

Executing Actions

Actions are pre-defined operations that can be executed on the database.

You can bulk execute an action by passing an array of objects to the inputs field (to name each parameter), or an array of tuples (for unnamed parameters).

To execute an action once, pass only one tuple to the inputs array.

const res = await kwil.execute(
    {
        namespace: 'db_namespace' // e.g., 'main',
        name: 'action_name', // e.g., 'create_user',
        // execute the same action two times:
        inputs: [
            ['iter_1_value_1', 'iter_1_value_2', 'iter_1_value_3'],
            ['iter_2_value_1', 'iter_2_value_2', 'iter_2_value_3'],
        ],
        description: 'Click sign to execute'
    },
    kwilSigner,
    true // set to true to wait for the transaction to be confirmed
)

/*
    res.data = {
        tx_hash: "hash",
    }
*/

Reading Data

To read data on Kwil, you can (1) execute ad-hoc SELECT queries or (2) call view actions.

Ad-Hoc SELECT Queries

const res = await kwil.selectQuery(
    'SELECT * FROM users WHERE age > $age',
    {
        $age: 30
    }
)

/*
    res.data = [
        ...
    ]
*/

View Actions

View actions are read-only actions that return data without having to wait for a transaction to be mined on Kwil.

If the view action uses a @caller contextual variable, you must pass a KwilSigner as the second argument to the kwil.call() method to identify the caller.

const res = await kwil.call(
    {
        namespace: 'db_namespace',
        name: 'action_name',
        inputs: ['input_value_1', 'input_value_2']
    },
    kwilSigner
)

Database Info

ChainID and Status

To verify that you are using the correct chainId, as well as the latest block height and block hash on your chain, you can call the .chainInfo() method.

const res = await kwil.chainInfo()

/*
    res.data = {
        chain_id: "your_chain_id",
        height: "latest_block_height",
        hash: "latest_block_hash"
    }
*/

Get Account

You can get the nonce and balance of an account by using the .getAccount() method. .getAccount() takes an account identifier, either in hex format or bytes (Uint8Array).

If you are using a custom signer, you should pass the signer's enumerator as the second argument.

// using secp256k1 (Ethereum) signer or ed25519 signer
const res = await kwil.getAccount("account_identifier")

// using custom signer
const res = await kwil.getAccount("account_identifier", "custom_signer_enumerator")

/*
    res.data = {
        identifier: Uint8Array,
        balance: "some_balance",
        nonce: "some_nonce"
    }
*/

Advanced Usage

Custom Signers

If you wish to sign with something other than an EtherJS signer, you may pass a callback function that accepts and returns a Uint8Array() and the enumerator for the signature type used.

Currently, Kwil supports two signature types:

Type	Enumerator	Identifier	Description
Secp256k1	'secp256k1'	Ethereum Wallet Address	The Kwil Signer will use Ethereum Personal Sign (EIP-191).
ED25519	'ed25519'	ED25519 Public Key	The Kwil Signer will use an ED25519 signature.

To use an ED25519 signature:

import nacl from 'tweetnacl';
import { KwilSigner } from '@kwilteam/kwil-js';

// create keypair and signer
const keys = nacl.sign.keyPair();
const customSigner = (msg) => nacl.sign.detached(msg, keys.secretKey);
const identifier = keys.publicKey;

const kwilSigner = new KwilSigner(customSigner, identifier, 'ed25519');

Private Mode

Private RPC is a server-side configuration in kwild that enforces user authentication for each call request. Learn more about private mode here.

const body: CallBody = {
        namespace,
        name: 'your_action_name',
        inputs: ['input_value_1', 'input_value_2']
};

// pass body AND kwilSigner if in Private Mode
const res = await kwil.call(body, kwilSigner);

Kwil Gateway Authentication

Kwil Gateway is an optional service on Kwil networks that allows for authenticating users with their signatures for read queries / view procedures. Learn more about the Kwil Gateway here.

// pass KwilSigner to the call method
const res = await kwil.call(body, kwilSigner);

/*
    res.data = {
        result: [ query results ],
    }
*/

Gateway logout

To log out of the Kwil Gateway, you can call the kwil.auth.logoutKGW() method. This is useful if you want to switch accounts or remove the authentication cookie.

await kwil.auth.logoutKGW();