Microsoft Azure Functions：价值“提供者” VS Code 生成的 Python 函数应用程序不能为 null

Question

这是我第 n 次遇到此错误，但这是我第一次使用 Azure 上的 Python 函数。以前，我在使用基于 Java 的函数以及 Azure 上的 Spring Cloud Function 时也遇到过同样的问题。

我使用官方 VS Code 扩展提供的所有默认值（在设置过程中配置适当的连接字符串）创建了一个基于 Python 的函数应用程序（使用 Blob 触发器）。尝试在本地运行我的函数应用程序时，出现以下错误（带有 --verbose 标志）：

[2022-04-11T10:04:25.432Z] Host configuration file read:
[2022-04-11T10:04:25.432Z] {
[2022-04-11T10:04:25.432Z]   "version": "2.0",
[2022-04-11T10:04:25.432Z]   "logging": {
[2022-04-11T10:04:25.432Z]     "applicationInsights": {
[2022-04-11T10:04:25.432Z]       "samplingSettings": {
[2022-04-11T10:04:25.432Z]         "isEnabled": true,
[2022-04-11T10:04:25.432Z]         "excludedTypes": "Request"
[2022-04-11T10:04:25.432Z]       }
[2022-04-11T10:04:25.432Z]     }
[2022-04-11T10:04:25.432Z]   },
[2022-04-11T10:04:25.432Z]   "extensionBundle": {
[2022-04-11T10:04:25.432Z]     "id": "Microsoft.Azure.Functions.ExtensionBundle",
[2022-04-11T10:04:25.432Z]     "version": "[2.*, 3.0.0)"
[2022-04-11T10:04:25.432Z]   }
[2022-04-11T10:04:25.432Z] }
[2022-04-11T10:04:25.456Z] Loading functions metadata
[2022-04-11T10:04:25.483Z] FUNCTIONS_WORKER_RUNTIME set to python. Skipping WorkerConfig for language:java
[2022-04-11T10:04:25.485Z] FUNCTIONS_WORKER_RUNTIME set to python. Skipping WorkerConfig for language:powershell
[2022-04-11T10:04:25.486Z] FUNCTIONS_WORKER_RUNTIME set to python. Skipping WorkerConfig for language:node
[2022-04-11T10:04:25.487Z] Reading functions metadata
[2022-04-11T10:04:25.503Z] 1 functions found
[2022-04-11T10:04:25.516Z] 1 functions loaded
[2022-04-11T10:04:25.522Z] Looking for extension bundle Microsoft.Azure.Functions.ExtensionBundle at /Users/sbsatter/.azure-functions-core-tools/Functions/ExtensionBundles/Microsoft.Azure.Functions.ExtensionBundle
[2022-04-11T10:04:25.525Z] Fetching information on versions of extension bundle Microsoft.Azure.Functions.ExtensionBundle available on https://functionscdn.azureedge.net/public/ExtensionBundles/Microsoft.Azure.Functions.ExtensionBundle/index.json
[2022-04-11T10:04:26.131Z] Downloading extension bundle from https://functionscdn.azureedge.net/public/ExtensionBundles/Microsoft.Azure.Functions.ExtensionBundle/2.8.4/Microsoft.Azure.Functions.ExtensionBundle.2.8.4_any-any.zip to /var/folders/7b/8bk0vwqx1yb9fvfdlj0qnlwh0000gn/T/dd0cf939-8efb-423e-ba0f-abb0027874e6/Microsoft.Azure.Functions.ExtensionBundle.2.8.4.zip
Value cannot be null. (Parameter 'provider')

Answer 1

回答我自己关于我的解决方法的问题（我想说的不是实际的解决方案），因为每隔几个月我就会遇到这个错误。

在我看来，在下载扩展包时，它由于某种原因而失败（或者更确切地说是超时），而日志中没有明确指定。我已经重试了几天但没有成功。因此，我从以下几行手动下载 ExtensionBundle 的 url：

[2022-04-11T10:04:26.131Z] 从 https://functionscdn.azureedge.net/public/ExtensionBundles/Microsoft.Azure.Functions.ExtensionBundle/2.8.4/Microsoft.Azure.Functions.ExtensionBundle.2.8.4_any-any.zip 到/var/folders/7b/8bk0vwqx1yb9fvfdlj0qnlwh0000gn/T/dd0cf939-8efb-423e-ba0f-abb0027874e6/Microsoft.Azure.Functions.ExtensionBundle.2.8.4.zip

并解压缩 zip 和 将其放在以下日志中提到的目录：

[2022-04-11T10:04:25.522Z] 在 /Users/sbsatter/.azure-functions-core-tools/Functions/ExtensionBundles/Microsoft 中查找扩展包 Microsoft.Azure.Functions.ExtensionBundle。 Azure.Functions.ExtensionBundle

之后，函数应用程序就可以正常启动，您可以从以下日志中观察到

[2022-04-11T10:16:44.797Z] Looking for extension bundle Microsoft.Azure.Functions.ExtensionBundle at /Users/sbsatter/.azure-functions-core-tools/Functions/ExtensionBundles/Microsoft.Azure.Functions.ExtensionBundle
[2022-04-11T10:16:44.800Z] Found a matching extension bundle at /Users/sbsatter/.azure-functions-core-tools/Functions/ExtensionBundles/Microsoft.Azure.Functions.ExtensionBundle/2.8.4
[2022-04-11T10:16:44.802Z] Fetching information on versions of extension bundle Microsoft.Azure.Functions.ExtensionBundle available on https://functionscdn.azureedge.net/public/ExtensionBundles/Microsoft.Azure.Functions.ExtensionBundle/index.json
[2022-04-11T10:16:45.076Z] Skipping bundle download since it already exists at path /Users/sbsatter/.azure-functions-core-tools/Functions/ExtensionBundles/Microsoft.Azure.Functions.ExtensionBundle/2.8.4

：解决方法也应该适用于其他触发器。