Add an initial run command

pkg/kubectl/generate.go

@@ -0,0 +1,70 @@
+/*
+Copyright 2014 Google Inc. All rights reserved.
+
+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.
+*/
+
+package kubectl
+
+import (
+	"fmt"
+
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
+	"github.com/spf13/cobra"
+)
+
+// GeneratorParam is a parameter for a generator
+// TODO: facilitate structured json generator input schemes
+type GeneratorParam struct {
+	Name     string
+	Required bool
+}
+
+// Generator is an interface for things that can generate API objects from input parameters.
+type Generator interface {
+	// Generate creates an API object given a set of parameters
+	Generate(params map[string]string) (runtime.Object, error)
+	// ParamNames returns the list of parameters that this generator uses
+	ParamNames() []GeneratorParam
+}
+
+// Generators is a global list of known generators.
+// TODO: Dynamically create this from a list of template files?
+var Generators map[string]Generator = map[string]Generator{
+	"run-container/v1": BasicReplicationController{},
+}
+
+// ValidateParams ensures that all required params are present in the params map
+func ValidateParams(paramSpec []GeneratorParam, params map[string]string) error {
+	for ix := range paramSpec {
+		if paramSpec[ix].Required {
+			value, found := params[paramSpec[ix].Name]
+			if !found || len(value) == 0 {
+				return fmt.Errorf("Parameter: %s is required", paramSpec[ix].Name)
+			}
+		}
+	}
+	return nil
+}
+
+// MakeParams is a utility that creates generator parameters from a command line
+func MakeParams(cmd *cobra.Command, params []GeneratorParam) (map[string]string, error) {
+	result := map[string]string{}
+	for ix := range params {
+		f := cmd.Flags().Lookup(params[ix].Name)
+		if f != nil {
+			result[params[ix].Name] = f.Value.String()
+		}
+	}
+	return result, nil
+}