3491 Kusto Execute Function support (#1055)

* 3491 Added GenerateExecuteFunctionScript to IDataSource, DataSourceBase, and KustoDataSource. Added ExecutionFunction to Scripter and IScripter.

* 3491 Refactored GenerateScriptForFunction in ScriptAsScriptingOperation to handle execute and alter

src/Microsoft.Kusto.ServiceLayer/DataSource/DataSourceBase.cs

@@ -105,6 +105,8 @@ namespace Microsoft.Kusto.ServiceLayer.DataSource
 
         public abstract string GenerateAlterFunctionScript(string functionName);
 
+        public abstract string GenerateExecuteFunctionScript(string functionName);
+
         /// <inheritdoc/>
         public DataSourceType DataSourceType { get; protected set; }
 

src/Microsoft.Kusto.ServiceLayer/DataSource/IDataSource.cs

@@ -123,10 +123,17 @@ namespace Microsoft.Kusto.ServiceLayer.DataSource
         bool Exists(DataSourceObjectMetadata objectMetadata);
 
         /// <summary>
-        /// Gets FunctionInfo object for a function
+        /// Generates an alter script for a function
         /// </summary>
         /// <param name="functionName"></param>
         /// <returns></returns>
         string GenerateAlterFunctionScript(string functionName);
+
+        /// <summary>
+        /// Generates an execute script for a function
+        /// </summary>
+        /// <param name="functionName"></param>
+        /// <returns></returns>
+        string GenerateExecuteFunctionScript(string functionName);
     }
 }

src/Microsoft.Kusto.ServiceLayer/DataSource/KustoDataSource.cs

@@ -1047,6 +1047,15 @@ namespace Microsoft.Kusto.ServiceLayer.DataSource
             return alterCommand.ToString();
         }
 
+        public override string GenerateExecuteFunctionScript(string functionName)
+        {
+            var functionInfo = GetFunctionInfo(functionName);
+            
+            return functionInfo == null 
+                ? string.Empty 
+                : $"{functionInfo.Name}{functionInfo.Parameters}";
+        }
+
         private string GenerateMetadataKey(string databaseName, string objectName)
         {
             return string.IsNullOrWhiteSpace(objectName) ? databaseName : $"{databaseName}.{objectName}";

src/Microsoft.Kusto.ServiceLayer/Scripting/IScripter.cs

@@ -8,5 +8,6 @@ namespace Microsoft.Kusto.ServiceLayer.Scripting
     {
         string SelectFromTableOrView(IDataSource dataSource, Urn urn);
         string AlterFunction(IDataSource dataSource, ScriptingObject scriptingObject);
+        string ExecuteFunction(IDataSource dataSource, ScriptingObject scriptingObject);
     }
 }

src/Microsoft.Kusto.ServiceLayer/Scripting/ScriptAsScriptingOperation.cs

@@ -71,7 +71,7 @@ namespace Microsoft.Kusto.ServiceLayer.Scripting
                 // TODO: Not including the header by default. We have to get this option from client
                 options.IncludeHeaders = false;
 
-                // Scripting data is not avaialable in the scripter
+                // Scripting data is not available in the scripter
                 options.ScriptData = false;
                 SetScriptingOptions(options);
 
@@ -82,7 +82,8 @@ namespace Microsoft.Kusto.ServiceLayer.Scripting
                         break;
                     
                     case ScriptingOperationType.Alter:
-                        resultScript = GenerateScriptAlter(DataSource, urns);
+                    case ScriptingOperationType.Execute:
+                        resultScript = GenerateScriptForFunction(DataSource);
                         break;
                 }
 
@@ -153,16 +154,25 @@ namespace Microsoft.Kusto.ServiceLayer.Scripting
             return string.Empty;
         }
 
-        private string GenerateScriptAlter(IDataSource dataSource, UrnCollection urns)
+        private string GenerateScriptForFunction(IDataSource dataSource)
         {
             ScriptingObject scriptingObject = this.Parameters.ScriptingObjects[0];
-            Urn objectUrn = urns[0];
 
-            if (string.Equals(scriptingObject.Type, "Function", StringComparison.CurrentCultureIgnoreCase))
+            if (!string.Equals(scriptingObject.Type, "Function", StringComparison.CurrentCultureIgnoreCase))
+            {
+                return string.Empty;
+            }
+
+            if (Parameters.Operation == ScriptingOperationType.Alter)
             {
                 return _scripter.AlterFunction(dataSource, scriptingObject);    
             }
 
+            if (Parameters.Operation == ScriptingOperationType.Execute)
+            {
+                return _scripter.ExecuteFunction(dataSource, scriptingObject);
+            }
+
             return string.Empty;
         }
 

src/Microsoft.Kusto.ServiceLayer/Scripting/Scripter.cs

@@ -32,5 +32,11 @@ namespace Microsoft.Kusto.ServiceLayer.Scripting
             var functionName = scriptingObject.Name.Substring(0, scriptingObject.Name.IndexOf('('));
             return dataSource.GenerateAlterFunctionScript(functionName);
         }
+        
+        public string ExecuteFunction(IDataSource dataSource, ScriptingObject scriptingObject)
+        {
+            var functionName = scriptingObject.Name.Substring(0, scriptingObject.Name.IndexOf('('));
+            return dataSource.GenerateExecuteFunctionScript(functionName);
+        }
     }
 }