Node-RED可以独立运行，也可以直接嵌入到Node.js应用中，这篇文章以具体的示例来进行说明。
环境说明
- 操作系统
liumiaocn:~ liumiao$ sw_vers
ProductName: Mac OS X
ProductVersion: 10.15.2
BuildVersion: 19C57
liumiaocn:~ liumiao$
- node版本
liumiaocn:~ liumiao$ node -v
v10.15.3
liumiaocn:~ liumiao$ npm -v
6.4.1
liumiaocn:~ liumiao$
- Node-RED版本
liumiaocn:~ liumiao$ node-red -h
Node-RED v1.0.4
Usage: node-red [-v] [-?] [--settings settings.js] [--userDir DIR]
[--port PORT] [--title TITLE] [--safe] [flows.json]
Options:
-p, --port PORT port to listen on
-s, --settings FILE use specified settings file
--title TITLE process window title
-u, --userDir DIR use specified user directory
-v, --verbose enable verbose output
--safe enable safe mode
-?, --help show this help
Documentation can be found at http://nodered.org
liumiaocn:~ liumiao$
代码准备
准备如下基于express的示例代码，将本地的node-red嵌入到此应用之中
liumiaocn:nodered liumiao$ ls
sample.js
liumiaocn:nodered liumiao$ cat sample.js
var http = require('http');
var express = require("express");
var RED = require("node-red");
// Create an Express app
var app = express();
// Add a simple route for static content served from 'public'
app.use("/",express.static("public"));
// Create a server
var server = http.createServer(app);
// Create the settings object - see default settings.js file for other options
var settings = {
httpAdminRoot:"/red",
httpNodeRoot: "/api",
userDir:"/Users/liumiao/.node-red",
functionGlobalContext: { } // enables global context
};
// Initialise the runtime with a server and settings
RED.init(server,settings);
// Serve the editor UI from /red
app.use(settings.httpAdminRoot,RED.httpAdmin);
// Serve the http nodes UI from /api
app.use(settings.httpNodeRoot,RED.httpNode);
server.listen(8000);
// Start the runtime
RED.start();
liumiaocn:nodered liumiao$
注意事项：/Users/liumiao/.node-red请修改为自己的本地Node-RED的相应目录。
依赖准备
使用如下命令安装所需依赖
执行命令：npm install express node-red
liumiaocn:nodered liumiao$ npm install express node-red
...省略
+ [email protected]
+ [email protected]
updated 2 packages in 3.505s
liumiaocn:nodered liumiao$
启动服务
使用如下命令启动服务，因为此Node.js服务本身没有添加功能，所以看起来似乎就是Node-RED，但是我们知道这是我们使用node在8000启动的新的服务
liumiaocn:nodered liumiao$ node sample.js
11 Mar 06:21:28 - [info]
Welcome to Node-RED
===================
11 Mar 06:21:28 - [info] Node-RED version: v1.0.4
11 Mar 06:21:28 - [info] Node.js version: v10.15.3
11 Mar 06:21:28 - [info] Darwin 19.2.0 x64 LE
11 Mar 06:21:28 - [info] Loading palette nodes
11 Mar 06:21:28 - [info] Context store : 'default' [module=memory]
11 Mar 06:21:28 - [info] User directory : /Users/liumiao/.node-red
11 Mar 06:21:28 - [warn] Projects disabled : set editorTheme.projects.enabled=true to enable
11 Mar 06:21:28 - [info] Flows file : /Users/liumiao/.node-red/flows_liumiaocn.json
11 Mar 06:21:28 - [warn]
---------------------------------------------------------------------
Your flow credentials file is encrypted using a system-generated key.
If the system-generated key is lost for any reason, your credentials
file will not be recoverable, you will have to delete it and re-enter
your credentials.
You should set your own key using the 'credentialSecret' option in
your settings file. Node-RED will then re-encrypt your credentials
file using your chosen key the next time you deploy a change.
---------------------------------------------------------------------
11 Mar 06:21:28 - [info] Starting flows
11 Mar 06:21:28 - [info] Started flows
使用/red的URL即可在8000端口确认在此Node.js应用中嵌入的Node-RED功能了
