implemented loading, configuring, starting multiple links with filters reading from appsettings.env.json; use ASPNETCORE_ENVIRONMENT to load your specific setting file (and set in your .gitignore) (#3)

Author: riccardone

src/LinkerConsoleApp/LinkerConsoleApp.csproj

@@ -24,6 +24,9 @@
     <None Update="appsettings.prod.json">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
+    <None Update="NLog.config">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
   </ItemGroup>
 
 </Project>

src/LinkerConsoleApp/LinkerSettings.cs

@@ -1,5 +1,18 @@
-namespace LinkerConsoleApp
+using System.Collections.Generic;
+using Linker;
+
+namespace LinkerConsoleApp
 {
+    public class LinkerSettings
+    {
+        public Link[] Links { get; set; }
+    }
+    public class Link
+    {
+        public Origin Origin { get; set; }
+        public Destination Destination { get; set; }
+        public IEnumerable<Filter> Filters { get; set; }
+    }
     public class Origin
     {
         public string ConnectionString { get; set; }

src/LinkerConsoleApp/Program.cs

@@ -1,6 +1,8 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
 using EventStore.ClientAPI;
 using EventStore.ClientAPI.SystemData;
 using Linker;
@@ -11,37 +13,51 @@ namespace LinkerConsoleApp
 {
     class Program
     {
-        private static Logger Log = LogManager.GetCurrentClassLogger();
+        private static readonly Logger Log = LogManager.GetCurrentClassLogger();
         static void Main(string[] args)
         {
             Log.Info("Building services...");
+            var config = BuildConfig();
+            var links = config.GetSection("links").Get<IEnumerable<Link>>();
+            var services = new List<LinkerService>();
+            foreach (var link in links)
+            {
+                var filters = link.Filters.Select(linkFilter => new Filter
+                {
+                    FilterOperation = linkFilter.FilterOperation, FilterType = linkFilter.FilterType,
+                    Value = linkFilter.Value
+                }).ToList();
+                var filterService = new FilterService(filters);
+                var service = new LinkerService(new LinkerConnectionBuilder(new Uri(link.Origin.ConnectionString),
+                    ConnectionSettings.Create().SetDefaultUserCredentials(new UserCredentials(link.Origin.User, link.Origin.Pass)),
+                    link.Origin.ConnectionName), new LinkerConnectionBuilder(new Uri(link.Destination.ConnectionString),
+                    ConnectionSettings.Create().SetDefaultUserCredentials(new UserCredentials(link.Destination.User, link.Destination.Pass)),
+                    link.Destination.ConnectionName), filterService, Settings.Default(), new NLogger());
+                services.Add(service);
+            }
+            StartServices(services);
+            Log.Info("Press enter to exit the program");
+            Console.ReadLine();
+        }
+
+        private static async Task StartServices(IEnumerable<LinkerService> services)
+        {
+            foreach (var linkerService in services)
+            {
+                Log.Info($"Starting {linkerService.Name}");
+                await linkerService.Start();
+            }
+        }
 
-            var env = Environment.GetEnvironmentVariable("CORE_ENVIRONMENT");
+        private static IConfigurationRoot BuildConfig()
+        {
+            var env = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");
             var builder = new ConfigurationBuilder()
                 .SetBasePath(Directory.GetCurrentDirectory())
                 .AddJsonFile("appsettings.json", optional: true, reloadOnChange: false)
                 .AddJsonFile($"appsettings.{env}.json", optional: true, reloadOnChange: false)
                 .AddEnvironmentVariables();
-            var config = builder.Build();
-
-            var origin = config.GetSection("origin").Get<Origin>();
-            var destination = config.GetSection("destination").Get<Destination>();
-            var filterService = new FilterService(new List<Filter>
-            {
-                new Filter { FilterOperation = FilterOperation.Exclude, FilterType = FilterType.Stream, Value = "diary-*" },
-                new Filter { FilterOperation = FilterOperation.Include, FilterType = FilterType.Stream, Value = "*" }
-            });
-
-            var service = new LinkerService(new LinkerConnectionBuilder(new Uri(origin.ConnectionString),
-                    ConnectionSettings.Create().SetDefaultUserCredentials(new UserCredentials(origin.User, origin.Pass)),
-                    origin.ConnectionName), new LinkerConnectionBuilder(new Uri(destination.ConnectionString),
-                    ConnectionSettings.Create().SetDefaultUserCredentials(new UserCredentials(destination.User, destination.Pass)),
-                    destination.ConnectionName), filterService, Settings.Default(), new NLogger());
-            service.Start().Wait();
-
-            Log.Info("Replica Service started");
-            Log.Info("Press enter to exit the program");
-            Console.ReadLine();
+            return builder.Build();
         }
     }
 }

src/LinkerConsoleApp/appsettings.json

@@ -1,15 +1,25 @@
 {
-  "Environment": "local",
-  "origin": {
-    "connectionString": "tcp://localhost:1112",
-    "user": "admin",
-    "pass": "changeit",
-    "connectionName": "origin-01"
-  },
-  "destination": {
-    "connectionString": "tcp://localhost:2112",
-    "user": "admin",
-    "pass": "changeit",
-    "connectionName": "destination-01"
-  }
+  "links": [
+    {
+      "origin": {
+        "connectionString": "tcp://localhost:1112",
+        "user": "admin",
+        "pass": "changeit",
+        "connectionName": "origin-01"
+      },
+      "destination": {
+        "connectionString": "tcp://localhost:2112",
+        "user": "admin",
+        "pass": "changeit",
+        "connectionName": "destination-01"
+      },
+      "filters": [
+        {
+          "filterType": "stream",
+          "value": "diary-input",
+          "filterOperation": "exclude"
+        }
+      ]
+    }
+  ]
 }