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EasyLayer Transport SDK

A lightweight SDK for easy client-side integration with EasyLayer-based applications. Provides a unified interface for sending requests and subscribing to events over different transport protocols (RPC, IPC). Designed for seamless communication with our apps.

This document contains:

Setup​

Make sure you have Node.js (version >= 16) installed.

Install the SDK via npm or yarn:

npm install @easylayer/transport-sdk
# or
yarn add @easylayer/transport-sdk

Basic Usage​

import { Client } from '@easylayer/transport-sdk';

const client = new Client({
  transport: {
    type: 'rpc',
    baseUrl: '`http://localhost:3000',`
  },
});

const response = await client.request('query', 'generated_requestId', {
  constructorName: 'Query_Name',
  dto: {
    modelIds: ['your_model_id'],
  },
});

// Subscribe to events (if supported by transport)
const unsubscribe = client.subscribe('Your_Event_Name', async (event) => {
  console.log('Received event:', event);
});

Transport API Reference​

RPC

Overview​

RPC transport is used for request-response communication with our apps.
All requests are sent as HTTP POST with a unified message envelope.

Configuration Example​

const client = new Client({
  transport: {
    type: 'rpc',
    baseUrl: '`http://localhost:3000'`
  },
});

Message Format​

All requests are sent as POST to the base URL with the following JSON body:

{
  "action": "query",
  "requestId": "generated_requestId",
  "payload": {
    "constructorName": "Query_Name",
    "dto": {
      "modelIds": ["your_model_id"]
    }
  }
}

Response Format​

TODO

API Methods​

  • client.request(action, requestId, payload) — Send a request and await response.
  • client.subscribe(constructorName, callback) — Not supported for RPC (will throw or be a no-op).
IPC (Node.js Child Process)

Overview​

IPC transport is used for communication between Node.js processes (e.g., parent and child only).

Configuration Example​

import { fork } from 'child_process';
const child = fork('path/to/easylayer_app');

const client = new Client({
  transport: {
    type: 'ipc',
    child,
  },
});

Message Format​

Messages are sent as JSON objects:

{
  "action": "query",
  "requestId": "generated_requestId",
  "payload": {
    "constructorName": "Query_Name",
    "dto": { "modelIds": ["your_model_id"] }
  }
}

Response Format​

{
  "action": "queryResponse",
  "requestId": "generated_requestId",
  "payload": { /* response data */ }
}

API Methods​

  • client.request(action, requestId, payload) — Send a request and await response.
  • client.subscribe(constructorName, callback) — Subscribe to events of a given type (event-driven).
WebSocket (WS) (planned)

Not yet implemented in this SDK. Planned for future releases.

TCP (planned)

Not yet implemented in this SDK. Planned for future releases.