Introduction

Prool is a library that provides programmatic HTTP testing instances for Ethereum. It is designed to be used in testing environments (e.g. Vitest) where you need to interact with an Ethereum server instance (e.g. Execution Node, 4337 Bundler, Indexer, etc) over HTTP or WebSocket.

Prool contains a set of pre-configured instances that can be used to simulate Ethereum server environments, being:

• Local Execution Nodes: anvil
• Bundler Nodes: alto, rundler⚠️, silius⚠️, stackup
• Indexer Nodes: ponder⚠️

⚠️ = soon

You can also create your own custom instances by using the defineInstance function.

Table of Contents

• Install
• Getting Started
  • Anvil (Execution Node)
  • Alto (Bundler Node)
  • Stackup (Bundler Node)
• Reference
  • createServer
  • defineInstance
  • definePool

Install

npm i prool

pnpm add prool

bun i prool

Getting Started

Anvil (Execution Node)

Requirements

• Foundry: curl -L https://foundry.paradigm.xyz | bash

Usage

import { createServer } from 'prool'
import { anvil } from 'prool/instances'

const server = createServer({
  instance: anvil(),
})

await server.start() 
// Instances accessible at:
// "http://localhost:8545/1"
// "http://localhost:8545/2"
// "http://localhost:8545/3"
// "http://localhost:8545/n"

Parameters

See AnvilParameters.

Alto (Bundler Node)

Requirements

• @pimlico/alto: npm i @pimlico/alto

Usage

import { createServer } from 'prool'
import { anvil, alto } from 'prool/instances'

const executionServer = createServer({
  instance: anvil(),
  port: 8545
})
await executionServer.start() 
// Instances accessible at:
// "http://localhost:8545/1"
// "http://localhost:8545/2"
// "http://localhost:8545/3"
// "http://localhost:8545/n"

const bundlerServer = createServer({
  instance: (key) => alto({
    entrypoints: ['0x0000000071727De22E5E9d8BAf0edAc6f37da032'],
    rpcUrl: `http://localhost:8545/${key}`,
    executorPrivateKeys: ['0x...'],
  })
})
await bundlerServer.start()
// Instances accessible at:
// "http://localhost:3000/1" (→ http://localhost:8545/1)
// "http://localhost:3000/2" (→ http://localhost:8545/2)
// "http://localhost:3000/3" (→ http://localhost:8545/3)
// "http://localhost:3000/n" (→ http://localhost:8545/n)

Parameters

See AltoParameters.

Stackup (Bundler Node)

Requirements

• Docker
• Stackup Docker Image: docker pull stackupwallet/stackup-bundler:latest

Usage

import { createServer } from 'prool'
import { anvil, stackup } from 'prool/instances'

const executionServer = createServer({
  instance: anvil(),
  port: 8545
})
await executionServer.start() 
// Instances accessible at:
// "http://localhost:8545/1"
// "http://localhost:8545/2"
// "http://localhost:8545/3"
// "http://localhost:8545/n"

const bundlerServer = createServer({
  instance: (key) => stackup({
    ethClientUrl: `http://localhost:8545/${key}`,
    privateKey: '0x...',
  })
})
await bundlerServer.start()
// Instances accessible at:
// "http://localhost:4337/1" (→ http://localhost:8545/1)
// "http://localhost:4337/2" (→ http://localhost:8545/2)
// "http://localhost:4337/3" (→ http://localhost:8545/3)
// "http://localhost:4337/n" (→ http://localhost:8545/n)

Parameters

See StackupParameters.

Reference

createServer

Creates a server that manages a pool of instances via a proxy.

Usage

import { createServer } from 'prool'
import { anvil } from 'prool/instances'

const executionServer = createServer({
  instance: anvil(),
})
await executionServer.start() 
// Instances accessible at:
// "http://localhost:8545/1"
// "http://localhost:8545/2"
// "http://localhost:8545/3"
// "http://localhost:8545/n"
// "http://localhost:8545/n/start"
// "http://localhost:8545/n/stop"
// "http://localhost:8545/n/restart"
// "http://localhost:8545/healthcheck"

Endpoints:

• /:key: Proxy to instance at key.
• /:key/start: Start instance at key.
• /:key/stop: Stop instance at key.
• /:key/restart: Restart instance at key.
• /healthcheck: Healthcheck endpoint.

API

| Name | Description | Type | | ---------- | -------------------------------------------------------- | --------------------------------------- | | instance | Instance for the server. | Instance \| (key: number) => Instance | | limit | Number of instances that can be instantiated in the pool | number | | host | Host for the server. | string | | port | Port for the server. | number | | returns | Server | CreateServerReturnType |

defineInstance

Creates an instance definition, that can be used with createServer or definePool.

Usage

import { defineInstance } from 'prool'

const foo = defineInstance((parameters: FooParameters) => {
 return {
   name: 'foo',
   host: 'localhost',
   port: 3000,
   async start() {
     // ...
   },
   async stop() {
     // ...
   },
 }
})

API

| Name | Description | Type | | ------- | -------------------- | ------------------ | | fn | Instance definition. | DefineInstanceFn | | returns | Instance. | Instance |

definePool

Defines a pool of instances. Instances can be started, cached, and stopped against an identifier.

Usage

import { definePool } from 'prool'
import { anvil } from 'prool/instances'

const pool = definePool({
 instance: anvil(),
})
const instance_1 = await pool.start(1)
const instance_2 = await pool.start(2)
const instance_3 = await pool.start(3)

API

| Name | Description | Type | | ---------- | -------------------------------------------------------- | ---------- | | instance | Instance for the pool. | Instance | | limit | Number of instances that can be instantiated in the pool | number | | returns | Pool. | Pool |

Authors

• @jxom (jxom.eth, Twitter)
• @tmm (awkweb.eth, Twitter)

License

MIT License