将命令式参数传递给 Azure Functions

Question

我让下面的代码在 Azure Functions 中运行正常并显示输出。然而，代码是静态的，我需要 URL（顶行）能够作为 HTTP 按需触发器的参数传递。

article here talks about Binding at runtime via imperative bindings, however it’s not 100% clear as to how to pass an HTTP based parameter e.g. https://myfunction.azurewebsites.net/api/AustereoJustPlaying?url=legacy.scahw.com.au/2classicrock_128.xspf 然后在 PowerShell 代码中使用参数。

# Get the initial metadata for the stream
$url = 'http://legacy.scahw.com.au/2classicrock_128.xspf'
$iwr = Invoke-RestMethod -Uri $url

# Build up the .Net web client
$HttpCompletionOption = 'ResponseContentRead'
$webClient = New-Object System.Net.Http.HttpClient
$webclient.DefaultRequestHeaders.Add('Icy-MetaData', '1')

# Get the Stream URL
$null = $iwr.InnerXml -match '<location>(?<location>.*)<\/location>'
$location = $matches.location
# Fire up the stream
$response = $webClient.GetAsync($location,$HttpCompletionOption)
$null = $webclient.DefaultRequestHeaders.Remove('Icy-MetaData')

# Pause until the stream title actually fires up
Start-Sleep -Seconds 2

# Grab the song
$iwr = Invoke-RestMethod -Uri $url    
$null = $iwr.InnerXml -match '<title>(?<song>.*)<\/title>'

# Kill the stream
$webclient.Dispose()
# Output the song
$matches.song

旁注，如果您在计算机上遇到以下错误......

新对象：找不到类型[System.Net.Http.HttpClient]：验证是否已加载包含此类型的程序集

运行这段代码，似乎你需要“预热”系统才能找到“类型”，运行 Find-Type httpClient 几次似乎被唤醒up系统实现是的，确实安装了这个类型。

function Find-Type ([regex]$pattern)
{
[System.AppDomain]::CurrentDomain.GetAssemblies().GetTypes() | 
Select-Object -ExpandProperty FullName | Select-String $pattern
}

Do {
cls
$TypeSearch = Find-Type httpClient
} until ($TypeSearch -match 'System.Net.Http.HttpClient')

Answer 1

默认的 PowerShell HTTP 触发器模板显示了一个示例。

查询字符串参数将以 req_query_<parametername> 格式的变量形式提供给您的脚本，因此在上面的示例中，可以使用以下方式访问 URL 参数：$req_query_url

下面的函数只是简单的返回参数的例子

Out-File -Encoding Ascii -FilePath $res -inputObject "URL parameter $req_query_url"

将命令式参数传递给 Azure Functions

Passing imperative parameters through to Azure Functions

azure

azure-functions