Question

我正在尝试使用Azure Functions v2每10秒将数据发送到事件中心。这是我的function.json代码

    {
  "scriptFile": "__init__.py",
  "bindings": [
    {
      "name": "mytimer",
      "type": "timerTrigger",
      "direction": "in",
      "schedule": "*/10 * * * * *"
    },
    {
      "type": "eventHub",
      "name": "$return",
      "eventHubName": "sqlserverstreaming",
      "connection": "amqps://desrealtimestreaming.servicebus.windows.net",
      "direction": "out"
  }
  ]
}

这是我用于 init .py

的代码

    import datetime
import logging
import azure.functions as func


def main(mytimer: func.TimerRequest) -> None:
    utc_timestamp = datetime.datetime.utcnow().replace(
        tzinfo=datetime.timezone.utc).isoformat()
    print('saran')
    return 'Message created at: {}'.format(utc_timestamp)
    # if mytimer.past_due:
    #     logging.info('The timer is past due!')
    # logging.info('Python timer trigger function ran at %s', utc_timestamp)

我收到以下错误。

 Executed 'Functions.TimerTriggerFUnction' (Failed, Id=fa924331-418f-427f-b672-f525c3ee6b61)
[07-08-2019 09:03:40] System.Private.CoreLib: Exception while executing function: Functions.TimerTriggerFUnction. System.Private.CoreLib: Result: Failure
Exception: FunctionLoadError: cannot load the TimerTriggerFUnction function: Python return annotation "NoneType" does not match binding type "eventHub"
Stack:   File "C:\Users\SivaSakthiVelan\AppData\Roaming\npm\node_modules\azure-functions-core-tools\bin\workers\python\deps\azure\functions_worker\dispatcher.py", line 240, in _handle__function_load_request
    function_id, func, func_request.metadata)
  File "C:\Users\SivaSakthiVelan\AppData\Roaming\npm\node_modules\azure-functions-core-tools\bin\workers\python\deps\azure\functions_worker\functions.py", line 241, in add_function
    f'Python return annotation "{return_pytype.__name__}" '

Answer 1

将退货类型从None更改为str

def main(mytimer: func.TimerRequest) -> str:

有关完整示例，请参见此处： https://docs.microsoft.com/en-us/azure/azure-functions/functions-bindings-event-hubs#output---python-example

此外，您的connection属性应具有包含连接字符串而不是连接字符串本身的应用程序设置的名称（另请参见示例），如下所示：

  "type": "eventHub",
  "name": "$return",
  "eventHubName": "sqlserverstreaming",
  "connection": "MyConnStringAppSetting",
  "direction": "out"

然后创建一个名为MyConnStringAppSetting的应用设置，并将完整的连接字符串放在其中。

如何在使用python中的计时器触发azure函数v2时将数据发送到事件

1 个答案: