通过WSS连接到在本地网络上运行的Polkadot Full Noder失败

问题描述

我已经设置了在192.168.2.254的本地服务器上运行的完整节点。我只是在尝试制作一个简单的脚本，该脚本基本上可以订阅区块链上的新头像。

const { ApiPromise,WsProvider } = require('@polkadot/api');

async function main () {
  const wsProvider = new WsProvider('wss://192.168.2.254:9944');
  const api = await ApiPromise.create({ provider: wsProvider });

  let count = 0;

  const unsubscribe = await api.rpc.chain.subscribeNewHeads((header) => {
    console.log(`Chain is at block: #${header.number}`);

    if (++count === 256) {
      unsubscribe();
      process.exit(0);
    }
  });
}

main().catch(console.error);

在服务器上，我还按照Polkadot Wiki的建议，使用自签名的ssl证书设置了nginx。这是块配置：

server {
        server_name 192.168.2.254

        root /var/www/html;
        index index.html;

        location / {
                try_files $uri $uri/ =404;

                proxy_pass http://localhost:9944;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header Host $host;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

                proxy_http_version 1.1;
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header Connection "upgrade";
        }

        listen [::]:443 ssl ipv6only=on;
        listen 443 ssl;
        ssl_certificate /etc/ssl/certs/nginx-selfsigned.crt;
        ssl_certificate_key /etc/ssl/private/nginx-selfsigned.key;

        ssl_session_cache shared:cache_nginx_SSL:1m;
        ssl_session_timeout 1440m;

        ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
        ssl_prefer_server_ciphers on;

        ssl_ciphers "ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS";

        ssl_dhparam /etc/ssl/certs/dhparam.pem;
}

如果我直接在服务器上运行脚本，而未配置任何提供程序（默认情况下将使用ws：//127.0.0.1：9944），则没有问题。但是，当我在本地计算机上运行它以指向wss：//192.168.2.254：9944时，输出为连接失败，代码为 1006 ：

节点listenToBlock.js─╯

2020-09-10 14:19:29          API-WS: disconnected from ws://192.168.2.254:9944 code: '1006' reason: 'connection failed'
_Event {
  type: 'error',isTrusted: false,_yaeti: true,target:
   W3CWebSocket {
     _listeners: {},addEventListener: [Function: _addEventListener],removeEventListener: [Function: _removeEventListener],dispatchEvent: [Function: _dispatchEvent],_url: 'ws://192.168.2.254:9944',_readyState: 3,_protocol: undefined,_extensions: '',_bufferedAmount: 0,_binaryType: 'arraybuffer',_connection: undefined,_client:
      WebSocketClient {
        _events: [Object: null prototype] {},_eventsCount: 0,_maxListeners: undefined,config: [Object],_req: null,protocols: [],origin: undefined,url: [Url],secure: false,base64nonce: 'cUJFFas2Ec3aN5YlHSxehg==' },onclose: [Function: value],onerror: [Function: value],onmessage: [Function: value],onopen: [Function: value] },cancelable: true,stopImmediatePropagation: [Function] }
2020-09-10 14:19:30          API-WS: disconnected from ws://192.168.2.254:9944 code: '1006' reason: 'connection failed'
2020-09-10 14:19:31          API-WS: disconnected from ws://192.168.2.254:9944 code: '1006' reason: 'connection failed'

在浏览器中接受未经验证的证书后，我还尝试将https://polkadot.js.org/apps/#/explorer的开发端点成功设置为wss：//192.168.2.254。

我最好的猜测是来自本地计算机上脚本的连接也需要接受未验证的证书，但是我找不到任何文档来帮助解决这个问题。感谢您的帮助！

解决方法

在端点URL上，提供端口9944是错误的，因为wss始终默认使用端口443。

我通过运行脚本来解决了这个问题

NODE_TLS_REJECT_UNAUTHORIZED=0 node listenToBlock.js

对于开发人员来说，这似乎是一种不错的解决方法。