在 Azure 函数上使用 web3.js 调用以太坊

Question

我正在尝试使用 Azure 函数通过 Web3.js 调用以太坊，代码似乎在命令 shell 中运行良好，但是当我运行它作为一个函数。

在 Azure 门户上创建一个新的 Javascript Azure 函数：

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

cd 网站光盘 wwwroot 光盘 npm 安装 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); console.log(web3.eth.blockNumber);
在CMD中执行这个文件shell

节点code.js
工作正常，我可以看到 HTTP Post 请求

要求：

POST / HTTP/1.1 用户代理：node-XMLHttpRequest 接受：/ 内容类型：application/json 主持人：：内容长度：63 Connection:close

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

回复：

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"        
      }
    }
  }
}

和运行

npm install

当我执行 Azure Functions 时出现此错误：

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.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.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.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.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.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

以下是我解决此问题的步骤。

在应用服务计划（而不是消费计划）上创建 Azure Function App
启用网络套接字
将运行时版本切换到 Beta

请注意，Websock 和运行时版本选项仅适用于应用服务计划。

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