Overhaul for plugin system

cmd/plugins.go

@@ -1,19 +0,0 @@
-package cmd
-
-import (
-	"io"
-
-	"github.com/spf13/cobra"
-
-	"github.com/ian-howell/airshipctl/cmd/workflow"
-
-	// "github.com/ian-howell/exampleplugin"
-
-	"github.com/ian-howell/airshipctl/pkg/environment"
-)
-
-// pluginCommands are the functions that create the entrypoint command for a plugin
-var pluginCommands = []func(io.Writer, *environment.AirshipCTLSettings, []string) *cobra.Command{
-	// exampleplugin.NewExampleCommand, // This is an example and shouldn't be enabled in production builds
-	workflow.NewWorkflowCommand,
-}

cmd/root.go

@@ -1,55 +1,19 @@
 package cmd
 
 import (
-	"fmt"
 	"io"
-	"os"
 
 	"github.com/spf13/cobra"
-
-	"github.com/ian-howell/airshipctl/pkg/environment"
-	"github.com/ian-howell/airshipctl/pkg/log"
 )
 
 // NewRootCmd creates the root `airshipctl` command. All other commands are
 // subcommands branching from this one
-func NewRootCmd(out io.Writer, settings *environment.AirshipCTLSettings, args []string) (*cobra.Command, error) {
+func NewRootCmd(out io.Writer) (*cobra.Command, error) {
 	rootCmd := &cobra.Command{
 		Use:   "airshipctl",
 		Short: "airshipctl is a unified entrypoint to various airship components",
 	}
 	rootCmd.SetOutput(out)
-
-	settings.InitFlags(rootCmd)
-
 	rootCmd.AddCommand(NewVersionCommand(out))
-
-	loadPluginCommands(rootCmd, out, settings, args)
-
-	rootCmd.PersistentFlags().Parse(args)
-
-	settings.InitDefaults()
-	log.Init(settings, out)
-
 	return rootCmd, nil
 }
-
-// Execute runs the base airshipctl command
-func Execute(out io.Writer) {
-	rootCmd, err := NewRootCmd(out, &environment.AirshipCTLSettings{}, os.Args[1:])
-	if err != nil {
-		fmt.Fprintln(out, err)
-		os.Exit(1)
-	}
-	if err := rootCmd.Execute(); err != nil {
-		fmt.Fprintln(out, err)
-		os.Exit(1)
-	}
-}
-
-// loadPluginCommands loads all of the plugins as subcommands to cmd
-func loadPluginCommands(cmd *cobra.Command, out io.Writer, settings *environment.AirshipCTLSettings, args []string) {
-	for _, subcmd := range pluginCommands {
-		cmd.AddCommand(subcmd(out, settings, args))
-	}
-}

cmd/workflow/workflow.go

@@ -6,18 +6,25 @@ import (
 	"github.com/spf13/cobra"
 
 	"github.com/ian-howell/airshipctl/pkg/environment"
+	wfenv "github.com/ian-howell/airshipctl/pkg/workflow/environment"
 )
 
+// PluginSettingsID is used as a key in the root settings map of plugin settings
+const PluginSettingsID = "argo"
+
 // NewWorkflowCommand creates a new command for working with argo workflows
-func NewWorkflowCommand(out io.Writer, settings *environment.AirshipCTLSettings, args []string) *cobra.Command {
+func NewWorkflowCommand(out io.Writer, rootSettings *environment.AirshipCTLSettings) *cobra.Command {
 	workflowRootCmd := &cobra.Command{
 		Use:     "workflow",
 		Short:   "Access to argo workflows",
 		Aliases: []string{"workflows", "wf"},
 	}
 
-	workflowRootCmd.AddCommand(NewWorkflowInitCommand(out, settings, args))
-	workflowRootCmd.AddCommand(NewWorkflowListCommand(out, settings, args))
+	wfSettings := &wfenv.Settings{}
+	wfSettings.InitFlags(workflowRootCmd)
+	workflowRootCmd.AddCommand(NewWorkflowInitCommand(out, wfSettings))
+	workflowRootCmd.AddCommand(NewWorkflowListCommand(out, rootSettings))
+	rootSettings.Register(PluginSettingsID, wfSettings)
 
 	return workflowRootCmd
 }

cmd/workflow/workflow_init.go

@@ -13,9 +13,8 @@ import (
 	"k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/client-go/kubernetes"
-	"k8s.io/client-go/rest"
 
-	"github.com/ian-howell/airshipctl/pkg/environment"
+	"github.com/ian-howell/airshipctl/pkg/workflow/environment"
 )
 
 const (
@@ -28,16 +27,16 @@ var (
 
 type workflowInitCmd struct {
 	out        io.Writer
-	config     *rest.Config
 	kubeclient kubernetes.Interface
+	crdclient  apixv1beta1client.ApiextensionsV1beta1Interface
 }
 
 // NewWorkflowInitCommand is a command for bootstrapping a kubernetes cluster with the necessary components for Argo workflows
-func NewWorkflowInitCommand(out io.Writer, settings *environment.AirshipCTLSettings, args []string) *cobra.Command {
+func NewWorkflowInitCommand(out io.Writer, settings *environment.Settings) *cobra.Command {
 	workflowInit := &workflowInitCmd{
 		out:        out,
-		config:     settings.KubeConfig,
 		kubeclient: settings.KubeClient,
+		crdclient:  settings.CRDClient,
 	}
 	workflowInitCommand := &cobra.Command{
 		Use:   "init [flags]",
@@ -160,11 +159,7 @@ func (wfInit *workflowInitCmd) createCustomObjects(manifestPath string) {
 }
 
 func (wfInit *workflowInitCmd) registerDefaultWorkflow() error {
-	apixClient, err := apixv1beta1client.NewForConfig(wfInit.config)
-	if err != nil {
-		return fmt.Errorf("Could not create CRD client: %s", err.Error())
-	}
-
+	apixClient := wfInit.crdclient
 	crds := apixClient.CustomResourceDefinitions()
 	workflowCRD := &apixv1beta1.CustomResourceDefinition{
 		ObjectMeta: metav1.ObjectMeta{
@@ -185,7 +180,7 @@ func (wfInit *workflowInitCmd) registerDefaultWorkflow() error {
 			Scope: apixv1beta1.NamespaceScoped,
 		},
 	}
-	_, err = crds.Create(workflowCRD)
+	_, err := crds.Create(workflowCRD)
 	return err
 }
 

cmd/workflow/workflow_list.go

@@ -5,26 +5,27 @@ import (
 	"io"
 	"text/tabwriter"
 
-	"github.com/argoproj/argo/pkg/client/clientset/versioned/typed/workflow/v1alpha1"
 	"github.com/spf13/cobra"
 	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 
 	"github.com/ian-howell/airshipctl/pkg/environment"
+	wfenv "github.com/ian-howell/airshipctl/pkg/workflow/environment"
 )
 
 // NewWorkflowListCommand is a command for listing argo workflows
-func NewWorkflowListCommand(out io.Writer, settings *environment.AirshipCTLSettings, args []string) *cobra.Command {
+func NewWorkflowListCommand(out io.Writer, rootSettings *environment.AirshipCTLSettings) *cobra.Command {
 	workflowListCmd := &cobra.Command{
 		Use:     "list",
 		Short:   "list workflows",
 		Aliases: []string{"ls"},
 		Run: func(cmd *cobra.Command, args []string) {
-			clientSet, err := v1alpha1.NewForConfig(settings.KubeConfig)
-			if err != nil {
-				panic(err.Error())
+			wfSettings, ok := rootSettings.PluginSettings[PluginSettingsID].(*wfenv.Settings)
+			if !ok {
+				fmt.Fprintf(out, "settings for %s were not registered\n", PluginSettingsID)
+				return
 			}
-
-			wflist, err := clientSet.Workflows(settings.Namespace).List(v1.ListOptions{})
+			clientSet := wfSettings.ArgoClient
+			wflist, err := clientSet.Workflows(wfSettings.Namespace).List(v1.ListOptions{})
 			if err != nil {
 				panic(err.Error())
 			}

go.sum

@@ -70,6 +70,7 @@ github.com/go-openapi/validate v0.18.0/go.mod h1:Uh4HdOzKt19xGIGm1qHf/ofbX1YQ4Y+
 github.com/gogo/protobuf v0.0.0-20171007142547-342cbe0a0415/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
 github.com/gogo/protobuf v1.2.1 h1:/s5zKNz0uPFCZ5hddgPdo2TK2TVrUNMn0OOX8/aZMTE=
 github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zVXpSg4=
+github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekfRL6a582T4P37/31XEstQ5p58=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
 github.com/golang/groupcache v0.0.0-20160516000752-02826c3e7903 h1:LbsanbbD6LieFkXbj9YNNBupiGHJgFeLpO0j0Fza1h8=
 github.com/golang/groupcache v0.0.0-20160516000752-02826c3e7903/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=

internal/test/utilities.go

@@ -6,12 +6,7 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
-	"strings"
 	"testing"
-
-	"github.com/ian-howell/airshipctl/cmd"
-	"github.com/ian-howell/airshipctl/pkg/environment"
-	"k8s.io/client-go/kubernetes/fake"
 )
 
 // UpdateGolden writes out the golden files with the latest values, rather than failing the test.
@@ -26,41 +21,7 @@ const (
 // CmdTest is a command to be run on the command line as a test
 type CmdTest struct {
 	Name    string
-	Command string
-}
-
-// RunCmdTests checks all of the tests actual output against their expected outputs
-func RunCmdTests(t *testing.T, tests []CmdTest) {
-	t.Helper()
-	for _, test := range tests {
-		cmdOutput := executeCmd(t, test.Command)
-		if *shouldUpdateGolden {
-			updateGolden(t, test, cmdOutput)
-		} else {
-			assertEqualGolden(t, test, cmdOutput)
-		}
-	}
-}
-
-func executeCmd(t *testing.T, command string) []byte {
-	var actual bytes.Buffer
-	settings := &environment.AirshipCTLSettings{
-		KubeClient: fake.NewSimpleClientset(),
-	}
-	// TODO(howell): switch to shellwords (or similar)
-	args := strings.Fields(command)
-	rootCmd, err := cmd.NewRootCmd(&actual, settings, args)
-	if err != nil {
-		t.Fatalf(err.Error())
-	}
-
-	rootCmd.SetArgs(args)
-
-	if err := rootCmd.Execute(); err != nil {
-		t.Fatalf(err.Error())
-	}
-
-	return actual.Bytes()
+	CmdLine string
 }
 
 func updateGolden(t *testing.T, test CmdTest, actual []byte) {

main.go

@@ -1,11 +1,36 @@
 package main
 
 import (
+	"fmt"
 	"os"
 
 	"github.com/ian-howell/airshipctl/cmd"
+	"github.com/ian-howell/airshipctl/cmd/workflow"
+
+	"github.com/ian-howell/airshipctl/pkg/environment"
+	"github.com/ian-howell/airshipctl/pkg/log"
 )
 
 func main() {
-	cmd.Execute(os.Stdout)
+	rootCmd, err := cmd.NewRootCmd(os.Stdout)
+	if err != nil {
+		fmt.Fprintln(os.Stdout, err)
+		os.Exit(1)
+	}
+
+	settings := &environment.AirshipCTLSettings{}
+	settings.InitFlags(rootCmd)
+
+	rootCmd.AddCommand(workflow.NewWorkflowCommand(os.Stdout, settings))
+
+	rootCmd.PersistentFlags().Parse(os.Args[1:])
+
+	settings.Init()
+
+	log.Init(settings, os.Stdout)
+
+	if err := rootCmd.Execute(); err != nil {
+		fmt.Fprintln(os.Stdout, err)
+		os.Exit(1)
+	}
 }

pkg/environment/settings.go

@@ -2,57 +2,36 @@ package environment
 
 import (
 	"github.com/spf13/cobra"
-	"k8s.io/client-go/kubernetes"
-	restclient "k8s.io/client-go/rest"
-	"k8s.io/client-go/tools/clientcmd"
 )
 
+type PluginSettings interface {
+	Init() error
+}
+
 // AirshipCTLSettings is a container for all of the settings needed by airshipctl
 type AirshipCTLSettings struct {
-	// KubeConfigFilePath is the path to the kubernetes configuration file.
-	// This flag is only needed when airshipctl is being used
-	// out-of-cluster
-	KubeConfigFilePath string
-
-	// KubeConfig contains the configuration details needed for interacting
-	// with the cluster
-	KubeConfig *restclient.Config
-
-	// KubeClient contains a kubernetes clientset
-	KubeClient kubernetes.Interface
-
-	// Namespace is the kubernetes namespace to be used during the context of this action
-	Namespace string
-
 	// Debug is used for verbose output
 	Debug bool
+
+	PluginSettings map[string]PluginSettings
 }
 
 // InitFlags adds the default settings flags to cmd
 func (a *AirshipCTLSettings) InitFlags(cmd *cobra.Command) {
 	flags := cmd.PersistentFlags()
 	flags.BoolVar(&a.Debug, "debug", false, "enable verbose output")
-	flags.StringVar(&a.KubeConfigFilePath, "kubeconfig", "", "path to kubeconfig")
-	flags.StringVar(&a.Namespace, "namespace", "default", "kubernetes namespace to use for the context of this command")
 }
 
-// InitDefaults assigns default values for any value that has not been previously set
-func (a *AirshipCTLSettings) InitDefaults() error {
-	if a.KubeConfigFilePath == "" {
-		a.KubeConfigFilePath = clientcmd.RecommendedHomeFile
+func (a *AirshipCTLSettings) Register(pluginName string, pluginSettings PluginSettings) {
+	if a.PluginSettings == nil {
+		a.PluginSettings = make(map[string]PluginSettings, 0)
 	}
+	a.PluginSettings[pluginName] = pluginSettings
+}
 
-	var err error
-	if a.KubeConfig == nil {
-		a.KubeConfig, err = clientcmd.BuildConfigFromFlags("", a.KubeConfigFilePath)
-		if err != nil {
-			return err
-		}
-	}
-
-	if a.KubeClient == nil {
-		a.KubeClient, err = kubernetes.NewForConfig(a.KubeConfig)
-		if err != nil {
+func (a *AirshipCTLSettings) Init() error {
+	for _, pluginSettings := range a.PluginSettings {
+		if err := pluginSettings.Init(); err != nil {
 			return err
 		}
 	}

pkg/workflow/environment/settings.go

@@ -0,0 +1,60 @@
+package environment
+
+import (
+	"github.com/spf13/cobra"
+	"k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/tools/clientcmd"
+	argo "github.com/argoproj/argo/pkg/client/clientset/versioned/typed/workflow/v1alpha1"
+
+	apixv1beta1 "k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset/typed/apiextensions/v1beta1"
+)
+
+// Settings is a container for all of the settings needed by workflows
+type Settings struct {
+	// Namespace is the kubernetes namespace to be used during the context of this action
+	Namespace string
+
+	// KubeConfigFilePath is the path to the kubernetes configuration file.
+	// This flag is only needed when airshipctl is being used
+	// out-of-cluster
+	KubeConfigFilePath string
+
+	// KubeClient is an instrument for interacting with a kubernetes cluster
+	KubeClient kubernetes.Interface
+
+	// ArgoClient is an instrument for interacting with Argo workflows
+	ArgoClient argo.ArgoprojV1alpha1Interface
+
+	CRDClient apixv1beta1.ApiextensionsV1beta1Interface
+}
+
+// InitFlags adds the default settings flags to cmd
+func (s *Settings) InitFlags(cmd *cobra.Command) {
+	flags := cmd.PersistentFlags()
+	flags.StringVar(&s.KubeConfigFilePath, "kubeconfig", "", "path to kubeconfig")
+	flags.StringVar(&s.Namespace, "namespace", "default", "kubernetes namespace to use for the context of this command")
+}
+
+// Init assigns default values
+func (s *Settings) Init() error {
+	if s.KubeConfigFilePath == "" {
+		s.KubeConfigFilePath = clientcmd.RecommendedHomeFile
+	}
+
+	var err error
+	kubeConfig, err := clientcmd.BuildConfigFromFlags("", s.KubeConfigFilePath)
+	if err != nil {
+		return err
+	}
+
+	s.KubeClient, err = kubernetes.NewForConfig(kubeConfig)
+	if err != nil {
+		return err
+	}
+
+	s.ArgoClient, err = argo.NewForConfig(kubeConfig)
+	if err != nil {
+		return err
+	}
+	return nil
+}