From c67b11eec357928de705308f5e484f81c6940130 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Matija=20Ko=C5=BEelj?= <matija.kozelj@tompit.net>
Date: Wed, 4 Jan 2023 15:24:41 +0100
Subject: [PATCH] Rewrite host to use standard hosting patterns

---
 src/Connected.Host/Program.cs | 91 +++++++++++++----------------------
 1 file changed, 33 insertions(+), 58 deletions(-)

diff --git a/src/Connected.Host/Program.cs b/src/Connected.Host/Program.cs
index 8eaa4fa..2c935aa 100644
--- a/src/Connected.Host/Program.cs
+++ b/src/Connected.Host/Program.cs
@@ -1,67 +1,42 @@
-using System.Reflection;
 using Connected.Host.Configuration;
 
 namespace Connected.Host
 {
-	public static class Program
+	public static partial class Program
 	{
-		public static void Main(params string[] args)
+		public static async Task Main(params string[] args)
 		{
-			SysConfiguration.Build();
-
-			Start(ParseArguments(args));
-		}
-
-		private static void Start(Dictionary<string, string> args)
-		{
-			foreach (var microService in SysConfiguration.MicroServices)
-				LoadMicroServiceAssembly(microService);
-
-			if (Type.GetType(SysConfiguration.Start) is not Type startupType)
-				throw new Exception($"Cannot resolve startup type. ({SysConfiguration.Start}).");
-
-			if (startupType.GetMethod("ConfigureAsync", BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic) is not MethodInfo configureMethod)
-				throw new Exception($"ConfigureAsync does not exists in the startup type {startupType}. Startup must have static 'async Task ConfigureAsync(params string[] args)' method.");
-
-			if (configureMethod.Invoke(null, new object[] { args }) is not Task task)
-				throw new Exception($"ConfigureAsync of type {startupType} must return Task.");
-
-			task.ConfigureAwait(false);
-
-			task.GetType().GetProperty("Result")?.GetValue(task);
-		}
-
-		private static Assembly? LoadMicroServiceAssembly(MicroServiceDescriptor descriptor)
-		{
-			var assemblyFile = descriptor.Name.EndsWith(".dll") ? descriptor.Name : $"{descriptor.Name}.dll";
-
-			foreach (var location in SysConfiguration.Locations)
-			{
-				var assemblyPath = Path.Combine(location, assemblyFile);
-
-				if (File.Exists(assemblyPath))
-					return Assembly.LoadFrom(assemblyPath);
-			}
-
-			return Assembly.Load(AssemblyName.GetAssemblyName(assemblyFile));
+			using IHost host = Microsoft.Extensions.Hosting.Host
+				.CreateDefaultBuilder(args)
+				.ConfigureAppConfiguration((_, cfg) =>
+				{
+					var appPath = AppContext.BaseDirectory;
+					var segments = new Uri(appPath).Segments;
+
+					segments = segments.Select(e => e.Replace("%20", " ")).ToArray();
+
+					for (var i = 1; i <= segments.Length; i++)
+					{
+						var pathBase = Path.Combine(segments[0..i]);
+						var filePath = Path.Combine(pathBase, "sys.json");
+
+						if (File.Exists(filePath))
+						{
+							cfg.AddJsonFile(filePath, true, false);
+							break;
+						}
+					}
+
+					cfg.AddEnvironmentVariables();
+				})
+				.ConfigureServices((context, services) =>
+				{
+					services.Configure<SysConfiguration>(context.Configuration);
+					services.AddHostedService<ConnectedPlatformService>();
+				})
+				.Build();
+
+			await host.RunAsync();
 		}
-
-		private static Dictionary<string, string> ParseArguments(params string[] args)
-		{
-			var result = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
-
-			foreach (var i in args)
-			{
-				var tokens = i.Split('=', 2);
-
-				if (tokens.Length == 1)
-					result.Add(tokens[0].Trim(), string.Empty);
-				else
-					result.Add(tokens[0].Trim(), tokens[1].Trim());
-			}
-
-			return result;
-		}
-
 	}
 }
\ No newline at end of file