Question

我正在尝试使用Azure功能使用Web3.js调用以太坊，代码似乎在命令shell中运行正常，但是当我将其作为函数运行时出现错误。

在Azure门户上创建一个新的Javascript Azure功能：

转到平台功能 - ＆gt;开发工具 - ＆gt;高级工具（kudu） - ＆gt;调试控制台 - ＆gt; CMD

cd网站 cd wwwroot 光盘 npm install web3@^0.20.0
创建一个新的code.js文件

const Web3 = require（'web3'）; var web3 = new Web3（）; const httpProv = new Web3.providers.HttpProvider（“http：//：8545”）; web3.setProvider（httpProv）; 的console.log（web3.eth.blockNumber）;
在CMD shell中执行此文件

node code.js
工作正常，我可以看到HTTP Post请求

请求：

POST / HTTP / 1.1 用户代理：节点的XMLHttpRequest 接受： / Content-Type：application / json 主持人：内容长度：63 连接：关闭

{“jsonrpc”：“2.0”，“id”：1，“method”：“eth_blockNumber”，“params”：[]}

响应：

HTTP/1.1 200 OK
Content-Type: application/json
Vary: Origin
Date:
Content-Length:
Connection:close

{"jsonrpc":"2.0", "id":1,"result":"bla"}

我在wwwroot目录中创建了一个package.json文件

{
  "frameworks": {
    "net46":{
      "dependencies": {
        "web3": "^0.20.0"        
      }
    }
  }
}

然后跑

npm install

当我执行Azure功能时，我收到此错误：

2017-10-30T08:31:44.291 Function started (Id=f28edf73-fa02-406d-868e-0f23cd41e6e0)
2017-10-30T08:31:44.338 Exception while executing function: Functions.AZURE_FUNCTION. mscorlib: Error: CONNECTION ERROR: Couldn't connect to node http://IP_ADDR:8545.
    at Object.InvalidConnection (D:\home\site\wwwroot\AZURE_FUNCTION\node_modules\web3\lib\web3\errors.js:31:16)
    at HttpProvider.send (D:\home\site\wwwroot\AZURE_FUNCTION\node_modules\web3\lib\web3\httpprovider.js:84:18)
    at RequestManager.send (D:\home\site\wwwroot\AZURE_FUNCTION\node_modules\web3\lib\web3\requestmanager.js:58:32)
    at Eth.get [as blockNumber] (D:\home\site\wwwroot\AZURE_FUNCTION\node_modules\web3\lib\web3\property.js:107:62)
    at module.exports (D:\home\site\wwwroot\AZURE_FUNCTION\index.js:8:25)
    at D:\Program Files (x86)\SiteExtensions\Functions\1.0.11296\bin\azurefunctions\functions.js:99:24.
2017-10-30T08:31:44.385 Function completed (Failure, Id=f28edf73-fa02-406d-868e-0f23cd41e6e0, Duration=94ms)
2017-10-30T08:31:44.385 Exception while executing function: Functions.AZURE_FUNCTION
2017-10-30T08:31:44.385 Error: CONNECTION ERROR: Couldn't connect to node http://IP_ADDR:8545.
    at Object.InvalidConnection (D:\home\site\wwwroot\AZURE_FUNCTION\node_modules\web3\lib\web3\errors.js:31:16)
    at HttpProvider.send (D:\home\site\wwwroot\AZURE_FUNCTION\node_modules\web3\lib\web3\httpprovider.js:84:18)
    at RequestManager.send (D:\home\site\wwwroot\AZURE_FUNCTION\node_modules\web3\lib\web3\requestmanager.js:58:32)
    at Eth.get [as blockNumber] (D:\home\site\wwwroot\AZURE_FUNCTION\node_modules\web3\lib\web3\property.js:107:62)
    at module.exports (D:\home\site\wwwroot\AZURE_FUNCTION\index.js:8:25)
    at D:\Program Files (x86)\SiteExtensions\Functions\1.0.11296\bin\azurefunctions\functions.js:99:24
2017-10-30T08:31:44.385 Function completed (Failure, Id=f28edf73-fa02-406d-868e-0f23cd41e6e0, Duration=94ms)
2017-10-30T08:31:44.385 Executed 'Functions.AZURE_FUNCTION' (Failed, Id=f28edf73-fa02-406d-868e-0f23cd41e6e0)
2017-10-30T08:31:44.385 Error: CONNECTION ERROR: Couldn't connect to node http://IP_ADDR:8545.
    at Object.InvalidConnection (D:\home\site\wwwroot\AZURE_FUNCTION\node_modules\web3\lib\web3\errors.js:31:16)
    at HttpProvider.send (D:\home\site\wwwroot\AZURE_FUNCTION\node_modules\web3\lib\web3\httpprovider.js:84:18)
    at RequestManager.send (D:\home\site\wwwroot\AZURE_FUNCTION\node_modules\web3\lib\web3\requestmanager.js:58:32)
    at Eth.get [as blockNumber] (D:\home\site\wwwroot\AZURE_FUNCTION\node_modules\web3\lib\web3\property.js:107:62)
    at module.exports (D:\home\site\wwwroot\AZURE_FUNCTION\index.js:8:25)
    at D:\Program Files (x86)\SiteExtensions\Functions\1.0.11296\bin\azurefunctions\functions.js:99:24
2017-10-30T08:31:44.385 Function had errors. See Azure WebJobs SDK dashboard for details. Instance ID is 'f28edf73-fa02-406d-868e-0f23cd41e6e0'
2017-10-30T08:31:44.385 Error: CONNECTION ERROR: Couldn't connect to node http://IP_ADDR:8545.
    at Object.InvalidConnection (D:\home\site\wwwroot\AZURE_FUNCTION\node_modules\web3\lib\web3\errors.js:31:16)
    at HttpProvider.send (D:\home\site\wwwroot\AZURE_FUNCTION\node_modules\web3\lib\web3\httpprovider.js:84:18)
    at RequestManager.send (D:\home\site\wwwroot\AZURE_FUNCTION\node_modules\web3\lib\web3\requestmanager.js:58:32)
    at Eth.get [as blockNumber] (D:\home\site\wwwroot\AZURE_FUNCTION\node_modules\web3\lib\web3\property.js:107:62)
    at module.exports (D:\home\site\wwwroot\AZURE_FUNCTION\index.js:8:25)
    at D:\Program Files (x86)\SiteExtensions\Functions\1.0.11296\bin\azurefunctions\functions.js:99:24
2017-10-30T08:31:44.400 {"id":"4e755d0e-a2cf-4c4a-a734-aa750555a948","requestId":"4fa42aca-ff49-487a-a543-8f82295a1e5c","statusCode":500,"errorCode":0,"message":"Exception while executing function: Functions.AZURE_FUNCTION -> Error: CONNECTION ERROR: Couldn't connect to node http://IP_ADDR:8545.\n    at Object.InvalidConnection (D:\\home\\site\\wwwroot\\AZURE_FUNCTION\\node_modules\\web3\\lib\\web3\\errors.js:31:16)\n    at HttpProvider.send (D:\\home\\site\\wwwroot\\AZURE_FUNCTION\\node_modules\\web3\\lib\\web3\\httpprovider.js:84:18)\n    at RequestManager.send (D:\\home\\site\\wwwroot\\AZURE_FUNCTION\\node_modules\\web3\\lib\\web3\\requestmanager.js:58:32)\n    at Eth.get [as blockNumber] (D:\\home\\site\\wwwroot\\FUNCTION_NAME\\node_modules\\web3\\lib\\web3\\property.js:107:62)\n    at module.exports (D:\\home\\site\\wwwroot\\FUNCTION_NAME\\index.js:8:25)\n    at D:\\Program Files (x86)\\SiteExtensions\\Functions\\1.0.11296\\bin\\azurefunctions\\functions.js:99:24"}
2017-10-30T08:31:44.400 Error: CONNECTION ERROR: Couldn't connect to node http://IP_ADDR:8545.
    at Object.InvalidConnection (D:\home\site\wwwroot\FUNCTION_NAME\node_modules\web3\lib\web3\errors.js:31:16)
    at HttpProvider.send (D:\home\site\wwwroot\FUNCTION_NAME\node_modules\web3\lib\web3\httpprovider.js:84:18)
    at RequestManager.send (D:\home\site\wwwroot\FUNCTION_NAME\node_modules\web3\lib\web3\requestmanager.js:58:32)
    at Eth.get [as blockNumber] (D:\home\site\wwwroot\FUNCTION_NAME\node_modules\web3\lib\web3\property.js:107:62)
    at module.exports (D:\home\site\wwwroot\FUNCTION_NAME\index.js:8:25)
    at D:\Program Files (x86)\SiteExtensions\Functions\1.0.11296\bin\azurefunctions\functions.js:99:24
2017-10-30T08:31:44  PID[10332] Information Sending response: 200.0 OK
2017-10-30T08:31:44  PID[10332] Information Sending response: 200.0 OK

Answer 1

以下是解决此问题的步骤。

在应用服务计划（而非消费计划）上创建Azure功能应用
启用websocket
将运行时版本切换为Beta

请注意，Websock和Runtime版本选项仅适用于App Service计划。

在Azure函数

1 个答案: