feat: adds some extension methods to telemetry

Author: bavanade

src/Liquid.OnAzure/Telemetry/AppInsightsTelemetryMiddleware.cs

@@ -0,0 +1,65 @@
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Http;
+using System;
+using System.Threading.Tasks;
+
+namespace Liquid.Microservices.Runtime.Telemetry
+{
+    /// <summary>
+    /// Cria uma extensão para o middleware
+    /// </summary>
+    public static class TelemetryExtensions
+    {
+        /// <summary>
+        /// Ativa o middleware customizado AppInsightsTelemetry para capturar todos os eventos das API.
+        /// e registrar logg no AppInsights com os detalhes adequados
+        /// </summary>
+        /// <param name="builder"></param>
+        /// <returns></returns>
+        public static IApplicationBuilder UseTelemetry(this IApplicationBuilder builder)
+        {
+            return builder.UseMiddleware<AppInsightsTelemetryMiddleware>();
+        }
+    }
+
+    /// <summary>
+    /// This telemetry don't will use the TelemetryClient because we need centrilaze all messages to AppInsights
+    /// </summary>
+    public class AppInsightsTelemetryMiddleware
+    {
+        private readonly LightTelemetry _telemetry = (LightTelemetry)WorkBench.Telemetry;
+
+        private readonly RequestDelegate _next;
+
+        /// <summary>
+        /// Middleware de Telemetria de Exceções 500
+        /// </summary>
+        /// <param name="next"></param>
+        public AppInsightsTelemetryMiddleware(RequestDelegate next)
+        {
+            _next = next;
+        }
+
+        /// <summary>
+        /// Intercepta a chamada da API
+        /// </summary>
+        /// <param name="context"></param>
+        /// <returns></returns>
+        public async Task Invoke(HttpContext context)
+        {
+            try
+            {
+                //TODO: Write log's to AppInsights or another techonology.
+                //TODO: Why trackEvent for every rest call?! 
+                //_telemetry.TrackEvent($"Telemetry from middleware.");
+
+                await _next(context);
+            }
+            catch (Exception ex)
+            {
+                _telemetry.TrackException(ex);
+                throw ex; //TODO: Check if its correcty
+            }
+        }
+    }
+}