[#125] node: Move viper creation to internal/common/config

Signed-off-by: Anton Nikiforov <an.nikiforov@yadro.com>

cmd/frostfs-node/config/calls.go

@@ -2,6 +2,8 @@ package config
 
 import (
 	"strings"
+
+	configViper "git.frostfs.info/TrueCloudLab/frostfs-node/cmd/internal/common/config"
 )
 
 // Sub returns a subsection of the Config by name.
@@ -38,11 +40,11 @@ func (x *Config) Sub(name string) *Config {
 //
 // Returns nil if config is nil.
 func (x *Config) Value(name string) any {
-	value := x.v.Get(strings.Join(append(x.path, name), separator))
+	value := x.v.Get(strings.Join(append(x.path, name), configViper.Separator))
 	if value != nil || x.defaultPath == nil {
 		return value
 	}
-	return x.v.Get(strings.Join(append(x.defaultPath, name), separator))
+	return x.v.Get(strings.Join(append(x.defaultPath, name), configViper.Separator))
 }
 
 // SetDefault sets fallback config for missing values.

cmd/frostfs-node/config/calls_test.go

@@ -7,6 +7,7 @@ import (
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-node/config"
 	configtest "git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-node/config/test"
+	configViper "git.frostfs.info/TrueCloudLab/frostfs-node/cmd/internal/common/config"
 	"github.com/stretchr/testify/require"
 )
 
@@ -36,7 +37,7 @@ func TestConfigEnv(t *testing.T) {
 	)
 
 	envName := strings.ToUpper(
-		strings.Join([]string{config.EnvPrefix, section, name}, config.EnvSeparator))
+		strings.Join([]string{config.EnvPrefix, section, name}, configViper.EnvSeparator))
 	err := os.Setenv(envName, value)
 	require.NoError(t, err)
 

cmd/frostfs-node/config/config.go

@@ -1,10 +1,7 @@
 package config
 
 import (
-	"fmt"
-	"strings"
-
-	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/config"
+	configViper "git.frostfs.info/TrueCloudLab/frostfs-node/cmd/internal/common/config"
 	"github.com/spf13/viper"
 )
 
@@ -17,21 +14,16 @@ import (
 type Config struct {
 	v *viper.Viper
 
-	opts opts
+	opts configViper.Opts
 
 	defaultPath []string
 	path        []string
 }
 
 const (
-	separator = "."
-
 	// EnvPrefix is a prefix of ENV variables related
 	// to storage node configuration.
 	EnvPrefix = "FROSTFS"
-
-	// EnvSeparator is a section separator in ENV variables.
-	EnvSeparator = "_"
 )
 
 // Prm groups required parameters of the Config.
@@ -42,34 +34,8 @@ type Prm struct{}
 // If file option is provided (WithConfigFile),
 // configuration values are read from it.
 // Otherwise, Config is a degenerate tree.
-func New(_ Prm, opts ...Option) *Config {
-	v := viper.New()
-
-	o := defaultOpts()
-	for i := range opts {
-		opts[i](o)
-	}
-
-	if o.envPrefix != "" {
-		v.SetEnvPrefix(o.envPrefix)
-		v.AutomaticEnv()
-		v.SetEnvKeyReplacer(strings.NewReplacer(separator, EnvSeparator))
-	}
-
-	if o.path != "" {
-		v.SetConfigFile(o.path)
-
-		err := v.ReadInConfig()
-		if err != nil {
-			panic(fmt.Errorf("failed to read config: %w", err))
-		}
-	}
-
-	if o.configDir != "" {
-		if err := config.ReadConfigDir(v, o.configDir); err != nil {
-			panic(fmt.Errorf("failed to read config dir: %w", err))
-		}
-	}
+func New(_ Prm, opts ...configViper.Option) *Config {
+	v, o := configViper.CreateViper(opts...)
 
 	return &Config{
 		v:    v,
@@ -79,18 +45,5 @@ func New(_ Prm, opts ...Option) *Config {
 
 // Reload reads configuration path if it was provided to New.
 func (x *Config) Reload() error {
-	if x.opts.path != "" {
-		err := x.v.ReadInConfig()
-		if err != nil {
-			return fmt.Errorf("rereading configuration file: %w", err)
-		}
-	}
-
-	if x.opts.configDir != "" {
-		if err := config.ReadConfigDir(x.v, x.opts.configDir); err != nil {
-			return fmt.Errorf("rereading configuration dir: %w", err)
-		}
-	}
-
-	return nil
+	return configViper.ReloadViper(x.v, x.opts)
 }

cmd/frostfs-node/config/configdir_test.go

@@ -5,6 +5,7 @@ import (
 	"path"
 	"testing"
 
+	configViper "git.frostfs.info/TrueCloudLab/frostfs-node/cmd/internal/common/config"
 	"github.com/spf13/cast"
 	"github.com/stretchr/testify/require"
 )
@@ -18,7 +19,7 @@ func TestConfigDir(t *testing.T) {
 	require.NoError(t, os.WriteFile(cfgFileName0, []byte(`{"storage":{"shard_pool_size":15}}`), 0777))
 	require.NoError(t, os.WriteFile(cfgFileName1, []byte("logger:\n  level: debug"), 0777))
 
-	c := New(Prm{}, WithConfigDir(dir))
+	c := New(Prm{}, configViper.WithConfigDir(dir))
 	require.Equal(t, "debug", cast.ToString(c.Sub("logger").Value("level")))
 	require.EqualValues(t, 15, cast.ToUint32(c.Sub("storage").Value("shard_pool_size")))
 }

cmd/frostfs-node/config/test/config.go

@@ -7,6 +7,7 @@ import (
 	"testing"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-node/config"
+	configViper "git.frostfs.info/TrueCloudLab/frostfs-node/cmd/internal/common/config"
 	"github.com/stretchr/testify/require"
 )
 
@@ -16,7 +17,7 @@ func fromFile(path string) *config.Config {
 	os.Clearenv() // ENVs have priority over config files, so we do this in tests
 
 	return config.New(p,
-		config.WithConfigFile(path),
+		configViper.WithConfigFile(path),
 	)
 }
 
@@ -25,7 +26,7 @@ func fromEnvFile(t testing.TB, path string) *config.Config {
 
 	loadEnv(t, path) // github.com/joho/godotenv can do that as well
 
-	return config.New(p, config.WithEnvPrefix(config.EnvPrefix))
+	return config.New(p, configViper.WithEnvPrefix(config.EnvPrefix))
 }
 
 func forEachFile(paths []string, f func(*config.Config)) {
@@ -53,7 +54,7 @@ func ForEnvFileType(t testing.TB, pref string, f func(*config.Config)) {
 func EmptyConfig() *config.Config {
 	var p config.Prm
 
-	return config.New(p, config.WithEnvPrefix(config.EnvPrefix))
+	return config.New(p, configViper.WithEnvPrefix(config.EnvPrefix))
 }
 
 // loadEnv reads .env file, parses `X=Y` records and sets OS ENVs.

cmd/frostfs-node/main.go

@@ -8,6 +8,7 @@ import (
 	"os"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-node/config"
+	configViper "git.frostfs.info/TrueCloudLab/frostfs-node/cmd/internal/common/config"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/misc"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/control"
@@ -47,8 +48,8 @@ func main() {
 	}
 
 	appCfg := config.New(config.Prm{},
-		config.WithConfigFile(*configFile), config.WithConfigDir(*configDir),
-		config.WithEnvPrefix(config.EnvPrefix))
+		configViper.WithConfigFile(*configFile), configViper.WithConfigDir(*configDir),
+		configViper.WithEnvPrefix(config.EnvPrefix))
 
 	err := validateConfig(appCfg)
 	fatalOnErr(err)

cmd/frostfs-node/validate_test.go

@@ -7,6 +7,7 @@ import (
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-node/config"
 	configtest "git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-node/config/test"
+	configViper "git.frostfs.info/TrueCloudLab/frostfs-node/cmd/internal/common/config"
 	"github.com/stretchr/testify/require"
 )
 
@@ -26,13 +27,13 @@ func TestValidate(t *testing.T) {
 	t.Run("mainnet", func(t *testing.T) {
 		os.Clearenv() // ENVs have priority over config files, so we do this in tests
 		p := filepath.Join(exampleConfigPrefix, "mainnet/config.yml")
-		c := config.New(config.Prm{}, config.WithConfigFile(p))
+		c := config.New(config.Prm{}, configViper.WithConfigFile(p))
 		require.NoError(t, validateConfig(c))
 	})
 	t.Run("testnet", func(t *testing.T) {
 		os.Clearenv() // ENVs have priority over config files, so we do this in tests
 		p := filepath.Join(exampleConfigPrefix, "testnet/config.yml")
-		c := config.New(config.Prm{}, config.WithConfigFile(p))
+		c := config.New(config.Prm{}, configViper.WithConfigFile(p))
 		require.NoError(t, validateConfig(c))
 	})
 }

cmd/internal/common/config/opts.go

@@ -1,38 +1,38 @@
 package config
 
-type opts struct {
-	path      string
-	configDir string
-	envPrefix string
+type Opts struct {
+	Path      string
+	ConfigDir string
+	EnvPrefix string
 }
 
-func defaultOpts() *opts {
-	return new(opts)
+func DefaultOpts() *Opts {
+	return new(Opts)
 }
 
 // Option allows to set an optional parameter of the Config.
-type Option func(*opts)
+type Option func(*Opts)
 
 // WithConfigFile returns an option to set the system path
 // to the configuration file.
 func WithConfigFile(path string) Option {
-	return func(o *opts) {
-		o.path = path
+	return func(o *Opts) {
+		o.Path = path
 	}
 }
 
 // WithConfigDir returns an option to set the system path
 // to the directory with configuration files.
 func WithConfigDir(path string) Option {
-	return func(o *opts) {
-		o.configDir = path
+	return func(o *Opts) {
+		o.ConfigDir = path
 	}
 }
 
 // WithEnvPrefix returns an option to defines
 // a prefix that ENVIRONMENT variables will use.
 func WithEnvPrefix(envPrefix string) Option {
-	return func(o *opts) {
-		o.envPrefix = envPrefix
+	return func(o *Opts) {
+		o.EnvPrefix = envPrefix
 	}
 }

cmd/internal/common/config/viper.go

@@ -0,0 +1,65 @@
+package config
+
+import (
+	"fmt"
+	"strings"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/config"
+	"github.com/spf13/viper"
+)
+
+const (
+	Separator = "."
+
+	// EnvSeparator is a section separator in ENV variables.
+	EnvSeparator = "_"
+)
+
+func CreateViper(opts ...Option) (*viper.Viper, *Opts) {
+	v := viper.New()
+
+	o := DefaultOpts()
+	for i := range opts {
+		opts[i](o)
+	}
+
+	if o.EnvPrefix != "" {
+		v.SetEnvPrefix(o.EnvPrefix)
+		v.AutomaticEnv()
+		v.SetEnvKeyReplacer(strings.NewReplacer(Separator, EnvSeparator))
+	}
+
+	if o.Path != "" {
+		v.SetConfigFile(o.Path)
+
+		err := v.ReadInConfig()
+		if err != nil {
+			panic(fmt.Errorf("failed to read config: %w", err))
+		}
+	}
+
+	if o.ConfigDir != "" {
+		if err := config.ReadConfigDir(v, o.ConfigDir); err != nil {
+			panic(fmt.Errorf("failed to read config dir: %w", err))
+		}
+	}
+
+	return v, o
+}
+
+func ReloadViper(v *viper.Viper, o Opts) error {
+	if o.Path != "" {
+		err := v.ReadInConfig()
+		if err != nil {
+			return fmt.Errorf("rereading configuration file: %w", err)
+		}
+	}
+
+	if o.ConfigDir != "" {
+		if err := config.ReadConfigDir(v, o.ConfigDir); err != nil {
+			return fmt.Errorf("rereading configuration dir: %w", err)
+		}
+	}
+
+	return nil
+}