Dev v7 health check (#1220)

Adds health check feature including some initial checks

src/Umbraco.Web/HealthCheck/HealthCheckController.cs

@@ -0,0 +1,68 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Web.Http;
+using Umbraco.Web.Editors;
+
+namespace Umbraco.Web.HealthCheck
+{
+    /// <summary>
+    /// The API controller used to display the health check info and execute any actions
+    /// </summary>
+    public class HealthCheckController : UmbracoAuthorizedJsonController
+    {
+        private readonly IHealthCheckResolver _healthCheckResolver;
+
+        public HealthCheckController()
+        {
+            _healthCheckResolver = HealthCheckResolver.Current;
+        }
+
+        public HealthCheckController(IHealthCheckResolver healthCheckResolver)
+        {
+            _healthCheckResolver = healthCheckResolver;
+        }
+
+        /// <summary>
+        /// Gets a grouped list of health checks, but doesn't actively check the status of each health check.
+        /// </summary>
+        /// <returns>Returns a collection of anonymous objects representing each group.</returns>
+        public object GetAllHealthChecks()
+        {
+            var groups = _healthCheckResolver.HealthChecks
+                .GroupBy(x => x.Group)
+                .OrderBy(x => x.Key);
+            var healthCheckGroups = new List<HealthCheckGroup>();
+            foreach (var healthCheckGroup in groups)
+            {
+                var hcGroup = new HealthCheckGroup
+                {
+                    Name = healthCheckGroup.Key,
+                    Checks = healthCheckGroup
+                        .OrderBy(x => x.Name)
+                        .ToList()
+                };
+                healthCheckGroups.Add(hcGroup);
+            }
+
+            return healthCheckGroups;
+        }
+
+        public object GetStatus(Guid id)
+        {
+            var check = _healthCheckResolver.HealthChecks.FirstOrDefault(x => x.Id == id);
+            if (check == null) throw new InvalidOperationException("No health check found with ID " + id);
+
+            return check.GetStatus();
+        }
+
+        [HttpPost]
+        public HealthCheckStatus ExecuteAction(HealthCheckAction action)
+        {
+            var check = _healthCheckResolver.HealthChecks.FirstOrDefault(x => x.Id == action.HealthCheckId);
+            if (check == null) throw new InvalidOperationException("No health check found with id " + action.HealthCheckId);
+
+            return check.ExecuteAction(action);
+        }
+    }
+}