gRPCity

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Introduction

gRPCity is a gRPC microservices library running on Node.js. It combines proto-loader and grpc-js to offer an exceptionally easy way to load proto files. It simplifies many complex technical concepts, allowing clients and servers to be implemented with just a few functions. Additionally, it provides numerous advanced features to meet the needs of most development scenarios.

The name is derived from "gRPC + City = gRPCity", symbolizing the author's hope that this library can support the development of business cities. Taking a technological perspective as the foundation, it enables everyone to focus on business and better support delivery.

Here is the feature:

• API: Communication protocol is based on gRPC and defined through Protobuf.
• Protobuf: Supports only dynamic load, simplifying the loading process of protobuf files.
• Client: Configured once, callable anytime, anywhere, and supports multi-server invocation.
• Server: Simplifies the initialization process with a three-step start, supporting multi-server deployment.
• Credentials: Complete support for certificate loading on both the client and server.
• No-Route: No routing, RPC is inherently bound to methods.
• Middleware: Both client and server support middleware.
• Metadata: Standardizes the transmission and retrieval of metadata.
• Reflection: Built-in gRPC Reflection API in server.
• Error: Provides dedicated Error objects to ensure targeted handling of exceptions after catching.
• Promise: Supports promisify internally in RPC methods while also preserving callbackify.
• Config: Supports protobuf load configurations and gRPC channel configurations.
• Typescript: Implemented purely in TypeScript with comprehensive types.

...and a lot more.

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View full documentation and examples on grpcity.js.org.

Quick Start

Install

npm i grpcity

Proto

First, create the greeter.proto file and write the following content in it:

syntax = "proto3";

package helloworld;

service Greeter {
  rpc SayGreet(Message) returns (Message) {}
}

message Message {
  string message = 1;
}

Loader

Next, create loader.js and write the following code in it:

import { ProtoLoader } from 'grpcity'
import path from 'node:path'

export default new ProtoLoader({
  location: path.join(__dirname, './'),
  files: ['greeter.proto']
})

Server

Then, create server.js and write the following code in it:

import loader from './loader.js'

class Greeter {
  async sayGreet(ctx) {
    const { message } = ctx.request
    return {
      message: `hello ${message || 'world'}`
    }
  }
}

const start = async (addr) => {
  await loader.init()

  const server = await loader.initServer()
  server.add('helloworld.Greeter', new Greeter())

  await server.listen(addr)
  console.log('gRPC Server is started: ', addr)
}

start('127.0.0.1:9099')

Client

Finally, create client.js and write the following code in it:

import loader from './loader.js'

const start = async (addr) => {
  await loader.init()

  const clients = await loader.initClients({
    services: {
      'helloworld.Greeter': addr
    }
  })

  const client = clients.get('helloworld.Greeter')
  const result = await client.sayGreet({ message: 'greeter' })
  console.log('sayGreet', result.response)
}

start('127.0.0.1:9099')

Once the programming work is completed, you can start it in the terminal by running:

node ./server.js
node ./client.js

---

View full documentation and examples on grpcity.js.org.

License

Released under the MIT License.