Major SDK Components
Overview
The Dexible SDK V2.0 has been dramatically simplified from its previous versions.
Installation
Currently, the SDK is implemented in Typescript, so installation is simple for JavaScript projects. Future support for python is under development.
yarn add dexible-sdk
Dexible
The top-most component is the Dexible class. The SDK can be constructed with or without a ethers Signer instance. Omitting a signer will limit certain functionality within the SDK related to order submission. Because we are now living in a multi-chain world, Dexible requires a "IWeb3Factory" implementation. The web3 factory is responsible for giving Dexible an instance of an ethers provider based on a specified chain id. If you use Infura for RPC services, there is an InfuraWeb3Factory in the SDK that simply takes the infura key and uses that to connect.
Here is an example of creating a Dexible instance:
import {Dexible, InfuraWeb3Factory} from 'dexible-sdk';
import {ethers} from 'ethers';
const signer = new ethers.Wallet(process.env.WALLET, provider);
//dexible instance with a signing wallet for order management
const sdk = new Dexible({
signer,
web3Factory: new InfuraWeb3Factory(process.env.INFURA_KEY)
});
// create limited Dexible instance without signer
const sdk = new Dexible({
web3Factory: new InfuraWeb3Factory(process.env.INFURA_KEY)
});
In this code snippet, we use the InfuraWeb3Factory provided by the SDK as the web3 factory implementation. We use a wallet key found in the environment to create a new ethers Walle
t instance. Then we create the Dexible instance using the wallet (signer) and factory.
Dexible currently supports the following networks:
Avalanche Mainnet
Binance Mainnet
Ethereum Mainnet
Ethereum Goerli
Fantom Mainnet (Opera)
Polygon Mainnet
Arbitrum Mainnet
SDK in a Browser
The SDK can be used in a browser but requires a web3 factory that interacts with a browser-supported wallet such as MetaMask or WalletConnect. Most wallet implementations support requests to change network, etc. Dexible mainly uses the IWeb3Factory implementation you provide to get the correct network connection when looking up token details and balance information. Dexible in the browser should also use Dexible's JWT support by providing an IJWTHandler implementation. This is a carryover from V1.0.
Using Web3 Provider
In a browser environment, you will likely have access to MetaMask or some other browser-based wallet. Here is an example to setup the signer you need for the SDK instead of a local wallet key:
const provider = new ethers.providers.Web3Provider(web3.currentProvider);
const signer = provider.getSigner();
JWT Handler
To create an SDK instance in the browser, you supply a handler that can store and retrieve a previously-created JWT. The interface looks like this:
export default interface IJWTHandler {
storeToken: (token:string, expiration: number) => Promise<void>;
readToken: () => Promise<string|null>;
}
The handler is given a token to store and is asked to retrieve a previously-stored token when needed. In most cases, you can store the token in localStorage in the browser or keep in memory if you don't want to store the token anywhere permanent.
Once you have a handler implementation, you can create an SDK instance with:
...
let sdk = new Dexible({
signer,
jwtHandler: new JWTHolder(),
web3Factory: myWeb3Factory
});
Here the JWTHolder just holds the token in memory. It's implementation might look like this:
class JWTHolder implements IJWTHandler {
token: string | null;
constructor() {
this.token = null;
}
//called by SDK when it needs to communicate to API. here we try
//pulling any previous token from local storage
readToken = async ():Promise<string|null> => {
if(!this.token) {
this.token = localStorage.getItem("DexibleJWT");
}
return this.token;
}
//called when SDK wants you to store the token for re-use
storeToken = async (token: string, expiration: number):Promise<void> => {
this.token = token;
localStorage.setItem("DexibleJWT", token);
}
}
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