add feature command

Signed-off-by: danish9039 <[email protected]>

otelcol/command.go

@@ -4,12 +4,16 @@
 package otelcol // import "go.opentelemetry.io/collector/otelcol"
 
 import (
+	// Standard library
 	"errors"
 	"flag"
 
+	// Third party
 	"github.com/spf13/cobra"
 
+	// Project internal
 	"go.opentelemetry.io/collector/featuregate"
+	"go.opentelemetry.io/collector/service"
 )
 
 // NewCommand constructs a new cobra.Command using the given CollectorSettings.
@@ -36,6 +40,7 @@ func NewCommand(set CollectorSettings) *cobra.Command {
 			return col.Run(cmd.Context())
 		},
 	}
+	rootCmd.AddCommand(newFeaturesCommand())
 	rootCmd.AddCommand(newComponentsCommand(set))
 	rootCmd.AddCommand(newValidateSubCommand(set, flagSet))
 	rootCmd.Flags().AddGoFlagSet(flagSet)
@@ -63,3 +68,17 @@ func updateSettingsUsingFlags(set *CollectorSettings, flags *flag.FlagSet) error
 	}
 	return nil
 }
+
+func newFeaturesCommand() *cobra.Command {
+	return &cobra.Command{
+		Use:   "features [feature-id]",
+		Short: "Display feature gates information",
+		Long:  "Display information about available feature gates and their status",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			if len(args) > 0 {
+				return service.DisplayFeature(args[0])
+			}
+			return service.DisplayFeatures()
+		},
+	}
+}

service/display_feature.go

@@ -0,0 +1,44 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package service // import "go.opentelemetry.io/collector/service"
+
+import (
+	"fmt"
+	"os"
+	"text/tabwriter"
+
+	"go.opentelemetry.io/collector/service/internal/graph"
+)
+
+func DisplayFeatures() error {
+	w := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
+	fmt.Fprintf(w, "ID\tEnabled\tStage\tDescription\n")
+	data := graph.GetFeaturesTableData()
+	for _, row := range data.Rows {
+		fmt.Fprintf(w, "%s\t%v\t%s\t%s\n",
+			row.ID,
+			row.Enabled,
+			row.Stage,
+			row.Description)
+	}
+	return w.Flush()
+}
+
+func DisplayFeature(id string) error {
+	data := graph.GetFeaturesTableData()
+	for _, row := range data.Rows {
+		if row.ID == id {
+			fmt.Printf("Feature: %s\n", row.ID)
+			fmt.Printf("Enabled: %v\n", row.Enabled)
+			fmt.Printf("Stage: %s\n", row.Stage)
+			fmt.Printf("Description: %s\n", row.Description)
+			fmt.Printf("From Version: %s\n", row.FromVersion)
+			if row.ToVersion != "" {
+				fmt.Printf("To Version: %s\n", row.ToVersion)
+			}
+			return nil
+		}
+	}
+	return fmt.Errorf("feature %q not found", id)
+}

service/internal/graph/host.go

@@ -138,11 +138,11 @@ func (host *Host) zPagesRequest(w http.ResponseWriter, _ *http.Request) {
 func handleFeaturezRequest(w http.ResponseWriter, _ *http.Request) {
 	w.Header().Set("Content-Type", "text/html; charset=utf-8")
 	zpages.WriteHTMLPageHeader(w, zpages.HeaderData{Title: "Feature Gates"})
-	zpages.WriteHTMLFeaturesTable(w, getFeaturesTableData())
+	zpages.WriteHTMLFeaturesTable(w, GetFeaturesTableData())
 	zpages.WriteHTMLPageFooter(w)
 }
 
-func getFeaturesTableData() zpages.FeatureGateTableData {
+func GetFeaturesTableData() zpages.FeatureGateTableData {
 	data := zpages.FeatureGateTableData{}
 	featuregate.GlobalRegistry().VisitAll(func(gate *featuregate.Gate) {
 		data.Rows = append(data.Rows, zpages.FeatureGateTableRowData{