Add a utility for YAML loading. (#98)

Author: brendandburns

src/Yaml.cs

@@ -0,0 +1,34 @@
+using System.IO;
+using System.Threading.Tasks;
+using YamlDotNet.Serialization;
+using YamlDotNet.Serialization.NamingConventions;
+
+namespace k8s
+{
+    /// <summary>
+    /// This is a utility class that helps you load objects from YAML files.
+    /// </summary>
+
+    public class Yaml {
+        public static async Task<T> LoadFromStreamAsync<T>(Stream stream) {
+            var reader = new StreamReader(stream);
+            var content = await reader.ReadToEndAsync();
+            return LoadFromString<T>(content);
+        }
+
+        public static async Task<T> LoadFromFileAsync<T> (string file) {
+            using (FileStream fs = File.Open(file, FileMode.Open, FileAccess.Write, FileShare.None)) { 
+                return await LoadFromStreamAsync<T>(fs);
+            }
+        }
+
+        public static T LoadFromString<T>(string content) {
+            var deserializer = 
+                new DeserializerBuilder()
+                .WithNamingConvention(new CamelCaseNamingConvention())
+                .Build();
+            var obj = deserializer.Deserialize<T>(content);
+            return obj;
+        }
+    }
+}

tests/YamlTests.cs

@@ -0,0 +1,39 @@
+using System.IO;
+using k8s.Models;
+using Xunit;
+
+namespace k8s.Tests
+{
+    public class YamlTests {
+        [Fact]
+        public void LoadFromString()
+        {
+            var content = @"apiVersion: v1
+kind: Pod
+metadata:
+  name: foo
+";
+
+           var obj = Yaml.LoadFromString<V1Pod>(content);
+
+           Assert.Equal("foo", obj.Metadata.Name);
+        }
+
+        [Fact]
+        public void LoadFromStream()
+        {
+            var content = @"apiVersion: v1
+kind: Pod
+metadata:
+  name: foo
+";
+
+            using (MemoryStream stream = new MemoryStream(System.Text.Encoding.UTF8.GetBytes(content)))
+            {
+                var obj = Yaml.LoadFromStreamAsync<V1Pod>(stream).Result;
+
+                Assert.Equal("foo", obj.Metadata.Name);
+            }
+        }
+    }
+}