Move Health interfaces to Common [#154972562]

src/Steeltoe.Common/HealthChecks/HealthCheckResult.cs

@@ -0,0 +1,42 @@
+// Copyright 2017 the original author or authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+using System.Collections.Generic;
+
+namespace Steeltoe.Common.HealthChecks
+{
+    /// <summary>
+    /// The result of a health check
+    /// </summary>
+    public class HealthCheckResult
+    {
+        /// <summary>
+        /// Gets or sets the status of the check
+        /// </summary>
+        /// <remarks>Used by HealthMiddleware to determine HTTP Status code</remarks>
+        public HealthStatus Status { get; set; } = HealthStatus.UNKNOWN;
+
+        /// <summary>
+        /// Gets or sets a description of the health check result
+        /// </summary>
+        /// <remarks>Currently only used on check failures</remarks>
+        public string Description { get; set; }
+
+        /// <summary>
+        /// Gets or sets details of the checked item
+        /// </summary>
+        /// <remarks>For parity with Spring Boot, repeat status [with a call to .ToString()] here</remarks>
+        public Dictionary<string, object> Details { get; set; } = new Dictionary<string, object>();
+    }
+}

src/Steeltoe.Common/HealthChecks/HealthStatus.cs

@@ -0,0 +1,25 @@
+// Copyright 2017 the original author or authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+namespace Steeltoe.Common.HealthChecks
+{
+    public enum HealthStatus
+    {
+        UNKNOWN,
+        UP,
+        WARNING,
+        OUT_OF_SERVICE,
+        DOWN,
+    }
+}

src/Steeltoe.Common/HealthChecks/IHealthContributor.cs

@@ -0,0 +1,33 @@
+// Copyright 2017 the original author or authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+namespace Steeltoe.Common.HealthChecks
+{
+    /// <summary>
+    /// Implement this interface and add to DI to be included in health checks
+    /// </summary>
+    public interface IHealthContributor
+    {
+        /// <summary>
+        /// Gets an identifier for the type of check being performed
+        /// </summary>
+        string Id { get; }
+
+        /// <summary>
+        /// Check the health of a resource
+        /// </summary>
+        /// <returns>The result of checking the health of a resource</returns>
+        HealthCheckResult Health();
+    }
+}