Add docker healthcheck support

Author: Sebazzz

Dockerfile

@@ -57,4 +57,8 @@ VOLUME ["/etc/pokertime"]
 # Set some defaults for a "direct run" experience
 ENV DATABASE__DATABASE "/app/data.db"
 ENV DATABASE__DATABASEPROVIDER Sqlite
+
+# ... health check
+HEALTHCHECK CMD curl --fail http://localhost/health || exit
+
 ENTRYPOINT [ "./launch", "run" ]

distscripts/ubuntu/launch

@@ -13,7 +13,7 @@ function run {
 
 	echo Starting application
 	cd $POKERTIME_APP_DIR
-	./PokerTime.Web
+	exec ./PokerTime.Web
 
 	exit $?
 }

src/PokerTime.Persistence/PokerTime.Persistence.csproj

@@ -16,6 +16,9 @@
     <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="3.1.3" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="3.1.3" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="3.1.3" />
+
+    <!-- Health checks for Docker -->
+    <PackageReference Include="Microsoft.Extensions.Diagnostics.HealthChecks.EntityFrameworkCore" Version="3.1.3"/>
   </ItemGroup>
 
   <ItemGroup>

src/PokerTime.Persistence/ServiceCollectionExtensions.cs

@@ -19,6 +19,8 @@ public static IServiceCollection AddPersistence(this IServiceCollection services
             services.ChainInterfaceImplementation<IEntityStateFacilitator, PokerTimeDbContext>();
             services.ChainInterfaceImplementation<IPokerTimeDbContextFactory, PokerTimeDbContext>();
 
+            services.AddHealthChecks().AddDbContextCheck<PokerTimeDbContext>();
+
             return services;
         }
     }

src/PokerTime.Web/PokerTime.Web.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk.Web">
+<Project Sdk="Microsoft.NET.Sdk.Web">
   <PropertyGroup>
     <KeepOutputPath>True</KeepOutputPath>
     <TypeScriptCompileBlocked>true</TypeScriptCompileBlocked>

src/PokerTime.Web/Startup.cs

@@ -93,6 +93,8 @@ public void Configure(IApplicationBuilder app, IWebHostEnvironment env, ILoggerF
             app.UseRouting();
 
             app.UseEndpoints(endpoints => {
+                endpoints.MapHealthChecks("/health");
+
                 endpoints.MapBlazorHub();
 
                 endpoints.MapFallbackToPage("/_Host");

utils/install-app-prereqs.sh

@@ -10,5 +10,5 @@ function ensure_success {
 
 echo "Installing app prerequisites..."
 apt-get -qqy update
-apt-get -qqy install libgdiplus
+apt-get -qqy install libgdiplus curl
 ensure_success