FeatureFlags: Remove the unsupported/undocumented option to read flags from a file (#79959)

pkg/services/featuremgmt/manager.go

@@ -19,9 +19,7 @@ type FeatureManager struct {
 	allowEditing    bool
 	licensing       licensing.Licensing
 	flags           map[string]*FeatureFlag
-	enabled         map[string]bool // only the "on" values
-	config          string          // path to config file
-	vars            map[string]any
+	enabled         map[string]bool   // only the "on" values
 	startup         map[string]bool   // the explicit values registered at startup
 	warnings        map[string]string // potential warnings about the flag
 	log             log.Logger
@@ -112,23 +110,6 @@ func (fm *FeatureManager) update() {
 	fm.enabled = enabled
 }
 
-// Run is called by background services
-func (fm *FeatureManager) readFile() error {
-	if fm.config == "" {
-		return nil // not configured
-	}
-
-	cfg, err := readConfigFile(fm.config)
-	if err != nil {
-		return err
-	}
-
-	fm.registerFlags(cfg.Flags...)
-	fm.vars = cfg.Vars
-
-	return nil
-}
-
 // IsEnabled checks if a feature is enabled
 func (fm *FeatureManager) IsEnabled(ctx context.Context, flag string) bool {
 	return fm.enabled[flag]

pkg/services/featuremgmt/service.go

@@ -1,9 +1,6 @@
 package featuremgmt
 
 import (
-	"os"
-	"path/filepath"
-
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
 
@@ -59,17 +56,6 @@ func ProvideManagerService(cfg *setting.Cfg, licensing licensing.Licensing) (*Fe
 		mgmt.startup[key] = val
 	}
 
-	// Load config settings
-	configfile := filepath.Join(cfg.HomePath, "conf", "features.yaml")
-	if _, err := os.Stat(configfile); err == nil {
-		mgmt.log.Info("[experimental] loading features from config file", "path", configfile)
-		mgmt.config = configfile
-		err = mgmt.readFile()
-		if err != nil {
-			return mgmt, err
-		}
-	}
-
 	// update the values
 	mgmt.update()
 

pkg/services/featuremgmt/settings.go

@@ -1,34 +0,0 @@
-package featuremgmt
-
-import (
-	"os"
-
-	"gopkg.in/yaml.v3"
-)
-
-type configBody struct {
-	// define variables that can be used in expressions
-	Vars map[string]any `yaml:"vars"`
-
-	// Define and override feature flag properties
-	Flags []FeatureFlag `yaml:"flags"`
-
-	// keep track of where the fie was loaded from
-	filename string
-}
-
-// will read a single configfile
-func readConfigFile(filename string) (*configBody, error) {
-	cfg := &configBody{}
-
-	// Can ignore gosec G304 because the file path is forced within config subfolder
-	//nolint:gosec
-	yamlFile, err := os.ReadFile(filename)
-	if err != nil {
-		return cfg, err
-	}
-
-	err = yaml.Unmarshal(yamlFile, cfg)
-	cfg.filename = filename
-	return cfg, err
-}

pkg/services/featuremgmt/settings_test.go

@@ -1,25 +0,0 @@
-package featuremgmt
-
-import (
-	"fmt"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-	"gopkg.in/yaml.v3"
-)
-
-func TestReadingFeatureSettings(t *testing.T) {
-	config, err := readConfigFile("testdata/features.yaml")
-	require.NoError(t, err, "No error when reading feature configs")
-
-	assert.Equal(t, map[string]any{
-		"level": "free",
-		"stack": "something",
-		"valA":  "value from features.yaml",
-	}, config.Vars)
-
-	out, err := yaml.Marshal(config)
-	require.NoError(t, err)
-	fmt.Printf("%s", string(out))
-}

pkg/services/featuremgmt/testdata/features.yaml

@@ -1,33 +0,0 @@
-include:
- - included.yaml # not yet supported
-
-vars: 
-  stack: something
-  level: free
-  valA: value from features.yaml
-
-flags: 
-  - name: feature1
-    description: feature1
-    expression: "false"
-
-  - name: feature3
-    description: feature3
-    expression: "true"
-
-  - name: feature3
-    description: feature3
-    expression: env.level == 'free'
-
-  - name: displaySwedishTheme
-    description: enable swedish background theme
-    expression: |
-      // restrict to users allowing swedish language
-      req.locale.contains("sv")
-  - name: displayFrenchFlag
-    description: sho background theme
-    expression: |
-      // only admins
-      user.id == 1
-      // show to users allowing french language
-      && req.locale.contains("fr")

pkg/services/featuremgmt/testdata/included.yaml

@@ -1,13 +0,0 @@
-include:
- - features.yaml # make sure we avoid recusion!
-
-# variables that can be used in expressions
-vars:
-  stack: something
-  deep: 1
-  valA: value from included.yaml
-
-flags: 
-  - name: featureFromIncludedFile
-    description: an inlcuded file
-    expression: invalid expression string here