MM-34674 Adding config telemetry for feature flags. (#17456)

* Adding config telemetry for feature flags.

* Review fixes.

model/config.go

@@ -3143,7 +3143,7 @@ type Config struct {
 	GuestAccountsSettings     GuestAccountsSettings
 	ImageProxySettings        ImageProxySettings
 	CloudSettings             CloudSettings  // telemetry: none
-	FeatureFlags              *FeatureFlags  `access:"*_read" json:",omitempty"` // telemetry: none
+	FeatureFlags              *FeatureFlags  `access:"*_read" json:",omitempty"`
 	ImportSettings            ImportSettings // telemetry: none
 	ExportSettings            ExportSettings
 }

model/feature_flags.go

@@ -3,7 +3,10 @@
 
 package model
 
-import "reflect"
+import (
+	"reflect"
+	"strconv"
+)
 
 type FeatureFlags struct {
 	// Exists only for unit and manual testing.
@@ -72,3 +75,26 @@ func (f *FeatureFlags) Plugins() map[string]string {
 
 	return pluginVersions
 }
+
+// ToMap returns the feature flags as a map[string]string
+// Supports boolean and string feature flags.
+func (f *FeatureFlags) ToMap() map[string]string {
+	refStructVal := reflect.ValueOf(*f)
+	refStructType := reflect.TypeOf(*f)
+	ret := make(map[string]string)
+	for i := 0; i < refStructVal.NumField(); i++ {
+		refFieldVal := refStructVal.Field(i)
+		if !refFieldVal.IsValid() {
+			continue
+		}
+		refFieldType := refStructType.Field(i)
+		switch refFieldType.Type.Kind() {
+		case reflect.Bool:
+			ret[refFieldType.Name] = strconv.FormatBool(refFieldVal.Bool())
+		default:
+			ret[refFieldType.Name] = refFieldVal.String()
+		}
+	}
+
+	return ret
+}

model/feature_flags_test.go

@@ -0,0 +1,54 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package model
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestFeatureFlagsToMap(t *testing.T) {
+	for name, tc := range map[string]struct {
+		Flags            FeatureFlags
+		TestFeatureValue string
+	}{
+		"empty": {
+			TestFeatureValue: "",
+			Flags:            FeatureFlags{},
+		},
+		"simple value": {
+			TestFeatureValue: "expectedvalue",
+			Flags:            FeatureFlags{TestFeature: "expectedvalue"},
+		},
+		"empty value": {
+			TestFeatureValue: "",
+			Flags:            FeatureFlags{TestFeature: ""},
+		},
+	} {
+		t.Run(name, func(t *testing.T) {
+			require.Equal(t, tc.TestFeatureValue, tc.Flags.ToMap()["TestFeature"])
+		})
+	}
+}
+
+func TestFeatureFlagsToMapBool(t *testing.T) {
+	for name, tc := range map[string]struct {
+		Flags            FeatureFlags
+		TestFeatureValue string
+	}{
+		"false": {
+			TestFeatureValue: "false",
+			Flags:            FeatureFlags{},
+		},
+		"true": {
+			TestFeatureValue: "true",
+			Flags:            FeatureFlags{TestBoolFeature: true},
+		},
+	} {
+		t.Run(name, func(t *testing.T) {
+			require.Equal(t, tc.TestFeatureValue, tc.Flags.ToMap()["TestBoolFeature"])
+		})
+	}
+}