Edge function helpers (#13)

Author: CLEMENTINATOR

edge-function/Component.cs

@@ -1,13 +1,44 @@
 namespace EdgeFunctionWorld.wit.exports.wasi.http.v0_2_0;
 using System.Text;
+using System.Text.Json;
+using System.Text.Json.Serialization;
 
 using EdgeFunctionWorld;
 using EdgeFunctionWorld.wit.exports.wasi.http.v0_2_0;
 using EdgeFunctionWorld.wit.imports.wasi.http.v0_2_0;
 using EdgeFunctionWorld.wit.imports.wasi.io.v0_2_0;
 
+public class Settings
+{
+    [JsonPropertyName("example")]
+    public string Example { get; set; }
+}
+
+[JsonSerializable(typeof(Settings))]
+internal partial class SettingsJsonContext : JsonSerializerContext
+{
+}
+
+
+
 public class IncomingHandlerImpl: IIncomingHandler {
     public static void Handle(ITypes.IncomingRequest request, ITypes.ResponseOutparam responseOut) {
+        var incomingHeaders = RequestUtility.ParseHeaders(request);
+        var incomingBody = RequestUtility.ParseBody(request);
+        var settings = RequestUtility.ParseSetting(incomingHeaders);
+
+        Console.WriteLine($"Received request with headers: {string.Join(", ", incomingHeaders.Select(kv => $"{kv.Key}: {Encoding.UTF8.GetString(kv.Value)}"))}");
+        if (incomingBody != null)
+        {
+            Console.WriteLine($"Request body: {Encoding.UTF8.GetString(incomingBody)}");
+        }
+        else
+        {
+            Console.WriteLine("Request body: null");
+        }
+        Console.WriteLine($"Settings: {settings?.Example ?? "No settings provided"}");
+
+        // write output
         byte[] content = "Hello, World!"u8.ToArray();
         List<(string, byte[])> headers =
         [

edge-function/RequestUtility.cs

@@ -0,0 +1,49 @@
+using System.Text;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+using EdgeFunctionWorld;
+using EdgeFunctionWorld.wit.exports.wasi.http.v0_2_0;
+using EdgeFunctionWorld.wit.imports.wasi.http.v0_2_0;
+using EdgeFunctionWorld.wit.imports.wasi.io.v0_2_0;
+
+public static class RequestUtility {
+    public static Dictionary<string, byte[]> ParseHeaders(ITypes.IncomingRequest request) {
+        var requestHeaders = new Dictionary<string, byte[]>();
+        foreach ((var key, var value) in request.Headers().Entries())
+        {
+            requestHeaders.Add(key, value);
+        }
+        return requestHeaders;
+    }
+
+    public static byte[]? ParseBody(ITypes.IncomingRequest request) {
+        var body_handle = request.Consume();
+        var stream = body_handle.Stream();
+        var bodyChunks = new List<byte>();
+
+        try {
+            while (true) {
+                var chunk = stream.Read(1024);
+                if (chunk.Length == 0) {
+                    break;
+                }
+                bodyChunks.AddRange(chunk);
+            }
+        }
+        catch (EdgeFunctionWorld.WitException e) {
+            switch (e.Value) {
+                case global::EdgeFunctionWorld.wit.imports.wasi.io.v0_2_0.IStreams.StreamError streamError:
+                   break;
+               default:
+                   throw;
+            }
+        }
+        finally {}
+        return bodyChunks.ToArray();
+    }
+
+    public static Settings ParseSetting(Dictionary<string, byte[]> headers) {
+        return JsonSerializer.Deserialize<Settings>(headers["x-edgee-component-settings"], SettingsJsonContext.Default.Settings);
+    }
+}