Add XM | XX features to JSON.SET command

Author: shacharPash

src/RediSharp.Core/RedisJsonCommands.cs

@@ -9,10 +9,17 @@ public static class RedisJsonCommands
     {
         DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
     };
-    public static RedisResult JsonSet(this IDatabase db, string key, string path, object obj)
+    public static RedisResult JsonSet(this IDatabase db, RedisKey key, string path, object obj, When when = When.Always)
     {
         var json = JsonSerializer.Serialize(obj);
-        var result = db.Execute("JSON.SET", key, path, json);
-        return result;
+        switch(when)
+        {
+            case When.Exists:
+                return db.Execute("JSON.SET", key, path, json, "XX");
+            case When.NotExists:
+                return db.Execute("JSON.SET", key, path, json, "NX");
+            default:
+                return db.Execute("JSON.SET", key, path, json);
+        }
     }
 }

tests/RediSharp.Tests/UnitTest1.cs

@@ -27,6 +27,22 @@ public void TestJsonSet()
     {
         var obj = new Person { Name = "Shachar", Age = 23 };
         _mock.Object.JsonSet("Person:Shachar", "$", obj);
-        _mock.Verify(x => x.Execute("JSON.SET", "Person:Shachar", "$", "{\"Name\":\"Shachar\",\"Age\":23}" ));
+        _mock.Verify(x => x.Execute("JSON.SET", "Person:Shachar", "$", "{\"Name\":\"Shachar\",\"Age\":23}"));
+    }
+
+    [Fact]
+    public void TestJsonSetExist()
+    {
+        var obj = new Person { Name = "Shachar", Age = 23 };
+        _mock.Object.JsonSet("Person:Shachar", "$", obj, When.Exists);
+        _mock.Verify(x => x.Execute("JSON.SET", "Person:Shachar", "$", "{\"Name\":\"Shachar\",\"Age\":23}", "XX"));
+    }
+
+    [Fact]
+    public void TestJsonSetNotExist()
+    {
+        var obj = new Person { Name = "Shachar", Age = 23 };
+        _mock.Object.JsonSet("Person:Shachar", "$", obj, When.NotExists);
+        _mock.Verify(x => x.Execute("JSON.SET", "Person:Shachar", "$", "{\"Name\":\"Shachar\",\"Age\":23}", "NX"));
     }
 }