PSObject returned from function gets in the way of serialization to JSON

[daxian-dbw]

Objects returned from function run is warpped into PSObject. Further more, the objects in a container object such as array/hastable may also wrapped into PSObject. This makes it not possible to directly use Newtonsoft.Json in the language worker to serailize object to JSON. We need to consider to use ConvertTo-Json for serailizatoin. For deserialization, it should be fine to directly use Newtonsoft.Json APIs.

Repro

run.ps1

param($req)

Write-Verbose "Processing a HTTP request" -Verbose

$output = @{}
$output["GUID1"] = (New-Guid).Guid
$output["GUID2"] = (New-Guid).Guid

# You associate values to output bindings by calling 'Push-OutputBinding'.
return [HttpResponseContext]@{
    StatusCode = 202
    Body = $output
}

function.json

{
  "disabled": false,
  "bindings": [
    {
      "authLevel": "function",
      "type": "httpTrigger",
      "direction": "in",
      "name": "req",
      "methods": [
        "get",
        "post"
      ]
    },
    {
      "type": "http",
      "direction": "out",
      "name": "$return"
    }
  ]
}

Expected Behavior

PS> irm http://localhost:7071/api/HttpStartPS
GUID1 GUID2
----- -----
xxxx  XXX

Actual Behavior

PS> irm http://localhost:7071/api/HttpStartPS
Microsoft.Azure.Functions.PowerShellWorker.HttpResponseContext