Question

我们正在尝试通过WebSockets连接到geth节点，以便能够订阅合同事件。该节点是使用docker创建的，并且该docker使用nginx作为代理。

我们可以轻松地与http（不是WS rpc）连接，但是我们不能通过http订阅合同事件。

我们已经设法在具有相同nginx代理的nodejs websocket服务器的此docker映像的本地实例中建立连接。但是我们无法连接到web3 v1.0.0-beta55。

使用此nginx配置（这是与非web3 websocket兼容的配置），我们得到的2个不同错误是403（禁止）：

location /rpcws {
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    proxy_pass http://localhost:22001;
}

或使用此其他配置的错误400（错误请求）：

location /rpcws {
    proxy_pass http://localhost:22001;
}

在客户端，我们要么

Error during WebSocket handshake: Unexpected response code: 400||403

或

connection not open on send()

现在，我们正在此docker映像的本地实例中跟踪可能的端口问题，但我们已对该节点进行了多次配置，以通过已经正常工作的http rpc端口接收该ws连接（显然更改了所有的geth和nginx配置接收wsrpc而不是http rpc），我们会得到相同的错误代码。

我们的主要猜测是nginx不能正确proxy_passing WebSocket请求。我们询问了法定网络技术团队，他们从未尝试建立WebSocket连接，并且他们不知道如何进一步帮助我们。任何猜测都是可以接受的。

谢谢！

下面列出了所有代码。

Solidity智能合约：

pragma solidity 0.4.18;

contract EventTest {

   string fName;
   uint age;

   event doSetInstructor();
   event instructorSetted(string name, uint age);

   function askForSetInstructor() public {
       doSetInstructor();
   }

   function setInstructor(string _fName, uint _age) public {
       fName = _fName;
       age = _age;
       instructorSetted(fName, age);
   }

   function getInstructor() public constant returns (string, uint) {
       return (fName, age);
   }

}

Web3连接：

var Web3 = require('web3');
var TruffleContract =  require('truffle-contract');
var eventTestABI = require('./abi/EventTest.json');
var io = require('socket.io-client');

var web3 = new Web3(new Web3.providers.WebsocketProvider('ws://9.43.80.817/rpcws'));

var contractAddress;


web3.eth.defaultAccount = '0x41E4e56603bF37a03Bb5Asa635787b3068052b82';


let truffleContract = TruffleContract(eventTestABI);
contractAddress = '0x82ce1df01f2a8bcadfad485eaa785424123734f7';
let contract = new web3.eth.Contract(eventTestABI.abi, contractAddress, {
    from: '0x41E4e56603bF37a03Bb5Asa635787b3068052b82',
    gas: 20000000,
    gasPrice: 0,
    data: truffleContract.deployedBytecode
});

web3.eth.subscribe('logs', {
    address: contract.options.address,
    topics: [contract.events.doSetInstructor().signature]
}, (error, result) => {
    if (!error) {
        console.log("Event triggered");
        const eventObj = web3.eth.abi.decodeLog(
            eventJsonInterface.inputs,
            result.data,
            result.topics.slice(1)
        )
        console.log("New event!", eventObj)
        console.log(eventObj);
    }else{
        console.log("Error watching event", error);
    }
});

盖特建立起来：

--networkid $NETID --identity $IDENTITY --permissioned --ws --wsaddr 0.0.0.0 
--wsport 22001 --wsapi admin,db,eth,debug,miner,net,shh,txpool,personal,web3,quorum,
istanbul --wsorigins '*' --rpc --rpcaddr $RPCADDR --rpcapi admin,db,eth,debug,miner,
net,shh,txpool,personal,web3,quorum,istanbul --rpccorsdomain '*' --rpcport 22000
--port 21000 --istanbul.requesttimeout 10000  --ethstats $IDENTITY --verbosity 3 --vmdebug --emitcheckpoints --targetgaslimit 18446744073709551615 --syncmode full --gcmode $GCMODE --vmodule consensus/istanbul/core/core.go=5 --nodiscover

nginx conf文件：

limit_req_zone $binary_remote_addr zone=one:10m rate=999999999999999999r/s;
limit_conn_zone $binary_remote_addr zone=addr:10m;


client_body_buffer_size 128k;

server {
    listen 80 default_server;
    listen [::]:80 default_server;
    listen 443 ssl default_server;
    listen [::]:443 ssl default_server;
    root /var/www/html;
    access_log /var/log/nginx/access_log combined;
    error_log /var/log/nginx/error.log warn;
    index index.html index.htm index.nginx-debian.html;
    #ssl_certificate /etc/ssl/nginx/alastria-test.crt;
    #ssl_certificate_key /etc/ssl/nginx/alastria-test.key;
    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
    ssl_ciphers HIGH:!aNULL:!MD5;
    client_body_timeout 30s;
    client_header_timeout 30s;

    add_header 'Access-Control-Allow-Headers' 'Content-Type';
    add_header 'Access-Control-Allow-Origin' "http://someurl.com";  

    location / {
        # First attempt to serve request as file, then as directory, then fall back to displaying a 404.
        try_files $uri $uri/ =404;
    }
    location /rpcws {
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_pass http://localhost:22001;
    }
    location /rpc {
        # Request rate and number of connections limitation
        limit_req zone=one burst=30 nodelay;
        limit_conn addr 10;
        # Whitelist/Blacklist
        include ./conf.d/blacklist;
        content_by_lua_block {
            ngx.req.read_body()
            local data = ngx.req.get_body_data()
            if data then
                if not (string.match(data,"eth_") or string.match(data,"net_") or string.match(data,"web3_") or string.match(data, "personal_")) then
                    ngx.exit(403)
                else
                    ngx.exec("@rpc_proxy")
                end
            end
        }
    }

    location @rpc_proxy {
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
        proxy_pass http://localhost:22000;
    }
}

使用Nginx通过WebSocket将Web3连接到节点时出现问题

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