ISNode Router Module

Introduction

This is just a module for the ISNode Framework. To learn how to use the framework, we strongly suggest obtaining a copy of the Hello World example.

The router module is responsible for creating, managing and utilizing routers. Routers are defined within the system configuration file and are responsible for passing requests from interfaces through to service controllers.

System Configuration

Below is an example configuration for the router module within the system configuration file (config.json). It defines a single router instance that routes messages from all interfaces to all services. You can also define individual interfaces and services by name within the array instead of the "select all" (*) symbol. This module also supports the definition of multiple routers - and thus makes for a very configurable framework.

  "router": {
    "instances": {
      "RouterOne": {
        "interfaces": ["*"],
        "services": ["*"]
      }
    }
  }

Methods

count()

Synchronous Function. Returns a count of the number of routers that have been instantiated

Input Parameters:

N/A

Returns: (Integer) A count of the number of instantiated routers

Example

	console.log(isnode.module("router").count()); // Prints "2" to the console if 2 routers have been instantiated

get(name)

Synchronous Function. Returns a router based on its name

Input Parameters:

1. name - (Object) Name of the router

Returns: The router object

Example

	var RouterOne = isnode.module("router").get("RouterOne");

router.incoming(message)

Event-Driven Function. Accepts an incoming message from an interface and routes it to the relevent service controller. Also opens a listener for a response event and routes it back to the interface when received.

Input Parameters:

1. message - (Object) Message Object

Returns: N/A

Example

	var message = {
		"type": "http",
		"interface": "http",
		"msgId": "1234",
		"state": "incoming",
		"directional": "simplex",
		"request": {
			"path": "/",
			"host": "localhost",
			"port": 80,
			"query": "name=john@age=21",
			"headers": {},
			"params": {},
			"cookies": {},
			"ip": "127.0.0.11",
			"verb": "GET",
			"secure": false,
			"body": "",
		}
	}

	var RouterOne = isnode.module("router").get("RouterOne");
	RouterOne.incoming(message);

router.route(hostname, url)

Synchronous Function. Returns a route object that references service+controller, based on a hostname and url (path)

Input Parameters:

1. hostname - (String) Hostname
2. url - (String) URL Path

Returns: N/A

Example

	var route = RouterOne.route("localhost", "/test");