Add powershell-http template

This is an initial powershell-http template
Create an HTTP server in powershell and call the
function/handler.ps1 script with the incoming request
body

Errors are returned with a 500 status code and the
exception message

Signed-off-by: Burton Rheutan <rheutan7@gmail.com>

Author: burtonr

template/powershell-http/Dockerfile

@@ -0,0 +1,19 @@
+FROM microsoft/powershell:ubuntu16.04
+
+RUN curl -sSLf https://github.com/openfaas-incubator/of-watchdog/releases/download/0.4.2/of-watchdog > /usr/bin/fwatchdog \
+    && chmod +x /usr/bin/fwatchdog
+WORKDIR /root/
+
+COPY server.ps1 server.ps1
+
+COPY function function
+
+HEALTHCHECK --interval=1s CMD [ -e /tmp/.lock ] || exit 1
+
+ENV fprocess="pwsh ./server.ps1"
+ENV cgi_headers="true"
+ENV mode="http"
+ENV upstream_url="http://127.0.0.1:8081"
+
+EXPOSE 8080
+CMD ["fwatchdog"]

template/powershell-http/function/handler.ps1

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+# Rename input for better readability
+$funcInput = $args
+$output = "Hello! Your input was: " + $funcInput
+
+# Must provide an output variable for the main process to return
+$output

template/powershell-http/server.ps1

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+Add-Type -AssemblyName System.Web
+
+$listener = New-Object System.Net.HttpListener
+$listener.Prefixes.Add("http://*:8081/")
+$listener.Start()
+
+do {
+    $context = $listener.GetContext()
+    $response = $context.Response
+    $Content = ""
+
+    $reqStream = $context.Request.InputStream
+    $reqEncoding = $context.Request.ContentEncoding
+
+    $reader = [System.IO.StreamReader]::new($reqStream, $reqEncoding)
+
+    $reqBody = $reader.ReadToEnd()
+
+    try {
+        $funcResult = . .\function\handler.ps1 $reqBody
+
+        $Content = [System.Text.Encoding]::UTF8.GetBytes($funcResult)
+        $response.StatusCode = 200
+    }
+    catch {
+        $Content = [System.Text.Encoding]::UTF8.GetBytes("$_.Exception.Message")
+        $response.StatusCode = 500
+    }
+
+    $response.ContentLength64 = $Content.Length
+    $response.OutputStream.Write($Content, 0, $Content.Length)
+    $response.Close()
+} while ($listener.IsListening)

template/powershell-http/template.yml

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+language: powershell-http
+fprocess: pwsh server.ps1