feat: DualEventServer ( Fixes #7 )

Author: StartAutomating

Servers/DualEventServer.ps1

@@ -0,0 +1,75 @@
+<#
+.SYNOPSIS
+    Event Server
+.DESCRIPTION
+    A simple event driven server.
+
+    Each request will generate an event, which will be responded to by a handler.
+#>
+param(
+# The rootUrl of the server.  By default, a random loopback address.
+[string]$RootUrl=
+    "http://127.0.0.1:$(Get-Random -Minimum 4200 -Maximum 42000)/"
+)
+
+$httpListener = [Net.HttpListener]::new()
+$httpListener.Prefixes.Add($RootUrl)
+Write-Warning "Listening on $RootUrl $($httpListener.Start())"
+
+$io = [Ordered]@{ # Pack our job input into an IO dictionary
+    HttpListener = $httpListener ; ServerRoot = $RootDirectory
+    MainRunspace = [Runspace]::DefaultRunspace; SourceIdentifier = $RootUrl
+    TypeMap = $TypeMap
+}
+
+# Our server is a thread job
+Start-ThreadJob -ScriptBlock {param([Collections.IDictionary]$io)
+    $psvariable = $ExecutionContext.SessionState.PSVariable
+    foreach ($key in $io.Keys) { # First, let's unpack.
+        if ($io[$key] -is [PSVariable]) { $psvariable.set($io[$key]) }
+        else { $psvariable.set($key, $io[$key]) }
+    }
+
+    $thisRunspace = [Runspace]::DefaultRunspace
+
+    # Because we are handling the event locally, the main thread can keep chugging.
+    Register-EngineEvent -SourceIdentifier $SourceIdentifier -Action {
+        try {
+            $request = $event.MessageData.Request
+            $reply = $event.MessageData.Reply
+            
+            $timeToRespond = [DateTime]::Now - $event.TimeGenerated
+            $myReply = "$($request.HttpMethod) $($request.Url) $($timeToRespond)"
+            $reply.Close($OutputEncoding.GetBytes($myReply), $false)
+        } catch {
+            Write-Error $_            
+        }        
+    }
+    
+    # Listen for the next request
+    :nextRequest while ($httpListener.IsListening) {     
+        $getContext = $httpListener.GetContextAsync()
+        while (-not $getContext.Wait(17)) { }
+        $request, $reply =
+            $getContext.Result.Request, $getContext.Result.Response
+        
+        # Generate events for every request
+        foreach ($runspace in $thisRunspace, $mainRunspace) {
+            # by broadcasting to multiple runspaces, we can both reply and have a record.
+            $runspace.Events.GenerateEvent(            
+                $SourceIdentifier, $httpListener, @(
+                    $getContext.Result, $request, $reply                    
+                ), [Ordered]@{
+                    Method = $Request.HttpMethod; Url = $request.Url
+                    Request = $request; Reply = $reply; Response = $reply
+                    ServerRoot = $ServerRoot; TypeMap = $TypeMap
+                }
+            )
+        }        
+    }            
+} -ThrottleLimit 100 -ArgumentList $IO -Name "$RootUrl" | # Output our job,
+    Add-Member -NotePropertyMembers @{ # but attach a few properties first:
+        HttpListener=$httpListener # * The listener (so we can stop it)
+        IO=$IO # * The IO (so we can change it)
+        Url="$RootUrl" # The URL (so we can easily access it).
+    } -Force -PassThru # Pass all of that thru and return it to you.