Show partial results when fetching of api resources fails (#44)

Show partial results when fetching of api resources fails

Author: corneliusweig

cmd/root.go

@@ -86,15 +86,16 @@ func Execute() error {
 func init() {
 	cobra.OnInitialize(initConfig)
 
-	rootCmd.PersistentFlags().StringVar(&ketallOptions.CfgFile, "config", "", "config file (default is $HOME/.kube/ketall.yaml)")
-	rootCmd.PersistentFlags().StringVarP(&v, "verbosity", "v", constants.DefaultLogLevel.String(), "Log level (debug, info, warn, error, fatal, panic)")
-
-	rootCmd.Flags().BoolVar(&ketallOptions.UseCache, constants.FlagUseCache, false, "use cached list of server resources")
-	rootCmd.Flags().StringVar(&ketallOptions.Scope, constants.FlagScope, "", "only resources with scope cluster|namespace")
-	rootCmd.Flags().StringVar(&ketallOptions.Since, constants.FlagSince, "", "only resources younger than given age")
-	rootCmd.Flags().StringVarP(&ketallOptions.Selector, constants.FlagSelector, "l", "", "selector (label query) to filter on, supports '=', '==', and '!='.(e.g. -l key1=value1,key2=value2)")
+	rootCmd.PersistentFlags().StringVar(&ketallOptions.CfgFile, "config", "", "Config file (default \"$HOME/.kube/ketall.yaml)\"")
+	rootCmd.PersistentFlags().StringVarP(&v, "verbosity", "v", constants.DefaultLogLevel.String(), "Log level (debug, info, warn, error, fatal, panic).")
+
+	rootCmd.Flags().BoolVar(&ketallOptions.UseCache, constants.FlagUseCache, false, "Use cached list of server resources.")
+	rootCmd.Flags().BoolVar(&ketallOptions.AllowIncomplete, constants.FlagAllowIncomplete, true, "Show partial results when fetching of API resources fails.")
+	rootCmd.Flags().StringVar(&ketallOptions.Scope, constants.FlagScope, "", "Only resources with scope cluster|namespace.")
+	rootCmd.Flags().StringVar(&ketallOptions.Since, constants.FlagSince, "", "Only resources younger than given age.")
+	rootCmd.Flags().StringVarP(&ketallOptions.Selector, constants.FlagSelector, "l", "", "Selector (label query) to filter on, supports '=', '==', and '!='.(e.g. -l key1=value1,key2=value2).")
 	rootCmd.Flags().StringVar(&ketallOptions.FieldSelector, constants.FlagFieldSelector, "", "Selector (field query) to filter on, supports '=', '==', and '!='.(e.g. --field-selector key1=value1,key2=value2). The common field queries for all types are metadata.name and metadata.namespace.")
-	rootCmd.Flags().StringSliceVar(&ketallOptions.Exclusions, constants.FlagExclude, []string{"events"}, "filter by resource name (plural form or short name)")
+	rootCmd.Flags().StringSliceVar(&ketallOptions.Exclusions, constants.FlagExclude, []string{"events"}, "Filter by resource name (plural form or short name).")
 
 	ketallOptions.GenericCliFlags.AddFlags(rootCmd.Flags())
 	ketallOptions.PrintFlags.AddFlags(rootCmd)

doc/USAGE.md

@@ -16,6 +16,7 @@ kubectl get-all
 - `--exclude` will filter out the given resources (either plural names `componentstatuses` or short form `cs`). Defaults to `events` because those are rarely useful.
 - ...and many standard `kubectl` options. Have a look at `kubectl get-all --help` for a full list of supported flags.
 - `--use-cache` will consider the http cache to determine the server resources to look at. Disabled by default.
+- `--allow-incomplete` will show partial results when fetching the list of API resources fails. Enabled by default.
 - `--verbosity` set the log level (one of debug, info, warn, error, fatal, panic).
 
 **Hint**: If you do not have access to all resources, bulk fetching needs to be disabled. You can speed things up by explicitly excluding all resources which you may not access.

internal/client/client.go

@@ -94,7 +94,10 @@ func fetchAvailableGroupResources(cache bool, scope string, flags *genericcliopt
 
 	resources, err := client.ServerPreferredResources()
 	if err != nil {
-		return nil, errors.Wrap(err, "get preferred resources")
+		if resources == nil || !viper.GetBool(constants.FlagAllowIncomplete) {
+			return nil, errors.Wrap(err, "get preferred resources")
+		}
+		logrus.Warnf("Could not fetch complete list of API resources, results will be incomplete: %s", err)
 	}
 
 	var grs []groupResource

internal/constants/constants.go

@@ -21,11 +21,12 @@ import "github.com/sirupsen/logrus"
 const (
 	DefaultLogLevel = logrus.WarnLevel
 
-	FlagExclude       = "exclude"
-	FlagNamespace     = "namespace"
-	FlagScope         = "only-scope"
-	FlagSince         = "since"
-	FlagUseCache      = "use-cache"
-	FlagSelector      = "selector"
-	FlagFieldSelector = "field-selector"
+	FlagExclude         = "exclude"
+	FlagNamespace       = "namespace"
+	FlagScope           = "only-scope"
+	FlagSince           = "since"
+	FlagUseCache        = "use-cache"
+	FlagAllowIncomplete = "allow-incomplete"
+	FlagSelector        = "selector"
+	FlagFieldSelector   = "field-selector"
 )

internal/options/options.go

@@ -31,6 +31,7 @@ type KetallOptions struct {
 	GenericCliFlags *genericclioptions.ConfigFlags
 	PrintFlags      KAPrintFlags
 	UseCache        bool
+	AllowIncomplete bool
 	Scope           string
 	Since           string
 	Selector        string