Nesthers

Description

The Nesthers Module is a convenient integration of the ethers.js library into NestJS applications. This module aims to simplify the interaction with Ethereum blockchain features such as smart contracts, wallets, events, and more, providing a seamless and developer-friendly experience within the NestJS framework.

Installation

Install the module via npm:

npm install nesthers

Install the module via yarn:

yarn add nesthers

Features

• Connection Configuration: Configure the Ethereum provider to connect to your preferred network (e.g., mainnet, testnet).
• Wallet Management: Manage Ethereum wallets effortlessly for secure transactions.
• Smart Contract Interaction: Easily interact with Ethereum smart contracts using the provided service methods.
• Event Handling: Streamline the handling of Ethereum events for real-time updates.
• Block Handling: Streamline the handling of Ethereum blocks for real-time updates.

Usage

1. Module initialization

import { Module } from "@nestjs/common";
import { EthersModule, JsonRpcConnection } from "nesthers";

@Module({
  imports: [
    EthersModule.forRoot({
      connection: {
        name: "Connection", // is option
        instace: new JsonRpcConnection({
          url: "<URL>",
        }),
        wallets: [], // is option
        contracts: [], // is option
      },
    }),
  ],
})
export class AppModule {}

2. Inject Connection

import { Injectable } from "@nestjs/common";
import { InjectConnection, JsonRpcConnection } from "nesthers";

@Injectable()
export class AppService {
  constructor(
    @InjectConnection("Conection") // name is option
    private readonly connection: JsonRpcConnection,
  ) {}
}

3. WalletBuilder

import { WalletBuilder, Wallet } from "nesthers";

@WalletBuilder({
  privateKey: "0x0...",
})
export class AliceWallet extends Wallet {
  // you can add your own functionality here
}

4. InjectWallet

import { Injectable } from "@nestjs/common";
import { InjectWallet } from "nesthers";
import { AliceWallet } from "./wallets/alice.wallet";

@Injectable()
export class AppService {
  constructor(
    @InjectWallet(AliceWallet.name) // name is require
    private readonly alice: AliceWallet,
  ) {}
}

5. ContractBuilder

import { ContractBuilder, Contract } from "nesthers";

@ContractBuilder({
  address: "0x0...",
  abi: [
    {
      "constant": true,
      "inputs": [],
      "name": "name",
      ...
    },
    ...
  ],
})
export class TokenContract extends Contract {
  // you can add your own functionality here
}

6. InjectContract

import { Injectable } from "@nestjs/common";
import { InjectContract } from "nesthers";
import { TokenContract } from "./contracts/token.contract";

@Injectable()
export class AppService {
  constructor(
    @InjectContract(TokenContract.name) // name is require
    private readonly token: TokenContract,
  ) {}
}

7. OnBlock

import { Injectable } from "@nestjs/common";
import { OnBlock, Arg } from "nesthers";

@Injectable()
export class AppService {
  @OnBlock({})
  newBlockHandler(@Arg("hash") hash: string) {
    console.log(hash);
  }
}

8. OnEvent

import { Injectable } from "@nestjs/common";
import { OnEvent, Arg } from "nesthers";

@Injectable()
export class AppService {
  @OnEvent({
    address: "0x0...",
    topics: [ /* args */ ],
  })
  newEventHandler(@Arg("hash") hash: string) {
    console.log(hash);
  }
}

License

nesthers is MIT licensed.