Startup and middleware: using IApplicationBuilder

Author: gorohoroh

OdeToFoodRider/OdeToFoodRider/Startup.cs

@@ -7,6 +7,7 @@
 using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
 
 namespace OdeToFoodRider
 {
@@ -21,13 +22,39 @@ public void ConfigureServices(IServiceCollection services)
         }
 
         // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
-        public void Configure(IApplicationBuilder app, IHostingEnvironment env, IGreeter greeter)
+        public void Configure(IApplicationBuilder app, IHostingEnvironment env, IGreeter greeter, ILogger<Startup> logger)
         {
-            if (env.IsDevelopment())
+//            if (env.IsDevelopment())
+//            {    
+//                app.UseDeveloperExceptionPage();
+//            }
+
+            app.Use(next =>
             {
-                app.UseDeveloperExceptionPage();
-            }
+                // RDVS: Rider's completion doesn't expect an identifier after the async keyword, so it starts to suggest weird classes,
+                // and this is where completion on space hurts: I wanted to type "context" but completion triggered on Space and inserted the unwanted ContextBoundObject  
+                return async context =>
+                {
+                    // RDVS: again bad completion on unresolved symbol: wanted to use undeclared "logger" to add it as parameter later, but got Logger<> completed instead
+                    logger.LogInformation("Request incoming");
+                    if (context.Request.Path.StartsWithSegments("/mym"))
+                    {
+                        await context.Response.WriteAsync("Hit!!!");
+                        logger.LogInformation("Request handled");
+                    }
+                    else
+                    {
+                        await next(context);
+                        logger.LogInformation("Response outgoing");
+                    }
+                };
+            });
 
+            app.UseWelcomePage(new WelcomePageOptions()
+            {
+                Path = "/wp"
+            });
+            
             app.Run(async (context) =>
             {
                 var greeting = greeter.GetMessageOfTheDay();

OdeToFoodVisualStudio/OdeToFoodVisualStudio/Startup.cs

@@ -3,6 +3,7 @@
 using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
 
 namespace OdeToFoodVisualStudio
 {
@@ -18,13 +19,38 @@ public void ConfigureServices(IServiceCollection services)
         }
 
         // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
-        public void Configure(IApplicationBuilder app, IHostingEnvironment env, IGreeter greeter)
+        public void Configure(IApplicationBuilder app, IHostingEnvironment env, IGreeter greeter, ILogger<Startup> logger)
         {
-            if (env.IsDevelopment())
+            //if (env.IsDevelopment())
+            //{
+            //    app.UseDeveloperExceptionPage();
+            //}
+
+            app.Use(next =>
             {
-                app.UseDeveloperExceptionPage();
-            }
+                return async context =>
+                {
+                    logger.LogInformation("Request incoming");
+                    if(context.Request.Path.StartsWithSegments("/mym"))
+                    {
+                        // RDVS: VS completion breaks down after the await keyword - no longer suggests anything. Workaround: type a sync statement first, then add the "await" keyword
+                        // Rider handles this just fine.
+                        await context.Response.WriteAsync("Hit!!!");
+                        logger.LogInformation("Request handled");
+                    }
+                    else
+                    {
+                        await next(context);
+                        logger.LogInformation("Response outgoing");
+                    }
+
+                };
+            });
 
+            app.UseWelcomePage(new WelcomePageOptions {
+                Path = "/wp"
+            });
+            
             app.Run(async (context) =>
             {
                 // Configuration sources by descending priority: 1. command-line parameter, 2. environment variable, 3. appsettings.json (enables storing dev settings in appsettings.json and overriding them in production wtih environment variables for example)