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

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package config
import (
"fmt"
"strings"
"github.com/nspcc-dev/neofs-node/cmd/neofs-node/config/internal"
"github.com/spf13/viper"
)
// Config represents a group of named values structured
// by tree type.
//
// Sub-trees are named configuration sub-sections,
// leaves are named configuration values.
// Names are of string type.
type Config struct {
v *viper.Viper
path []string
}
const separator = "."
// Prm groups required parameters of the Config.
type Prm struct{}
// New creates a new Config instance.
//
// 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()
v.SetEnvPrefix(internal.EnvPrefix)
v.AutomaticEnv()
v.SetEnvKeyReplacer(strings.NewReplacer(separator, internal.EnvSeparator))
o := defaultOpts()
for i := range opts {
opts[i](o)
}
if o.path != "" {
v.SetConfigFile(o.path)
err := v.ReadInConfig()
if err != nil {
panic(fmt.Errorf("failed to read config: %w", err))
}
}
return &Config{
v: v,
}
}