2 files changed, 97 insertions, 0 deletions
diff --git a/plugins/config/interface.go b/plugins/config/interface.go
new file mode 100644
index 00000000..2a7c67ce
--- /dev/null
+++ b/plugins/config/interface.go
@@ -0,0 +1,22 @@
+package config
+
+type Configurer interface {
+	// UnmarshalKey reads configuration section into configuration object.
+	//
+	// func (h *HttpService) Init(cp config.Configurer) error {
+	//     h.config := &HttpConfig{}
+	//     if err := configProvider.UnmarshalKey("http", h.config); err != nil {
+	//         return err
+	//     }
+	// }
+	UnmarshalKey(name string, out interface{}) error
+
+	// Get used to get config section
+	Get(name string) interface{}
+
+	// Overwrite used to overwrite particular values in the unmarshalled config
+	Overwrite(values map[string]interface{}) error
+
+	// Has checks if config section exists.
+	Has(name string) bool
+}
diff --git a/plugins/config/plugin.go b/plugins/config/plugin.go
new file mode 100755
index 00000000..1a170448
--- /dev/null
+++ b/plugins/config/plugin.go
@@ -0,0 +1,75 @@
+package config
+
+import (
+	"bytes"
+	"strings"
+
+	"github.com/spf13/viper"
+	"github.com/spiral/errors"
+)
+
+type Viper struct {
+	viper     *viper.Viper
+	Path      string
+	Prefix    string
+	Type      string
+	ReadInCfg []byte
+}
+
+// Inits config provider.
+func (v *Viper) Init() error {
+	const op = errors.Op("viper plugin init")
+	v.viper = viper.New()
+	// If user provided []byte data with config, read it and ignore Path and Prefix
+	if v.ReadInCfg != nil && v.Type != "" {
+		v.viper.SetConfigType("yaml")
+		return v.viper.ReadConfig(bytes.NewBuffer(v.ReadInCfg))
+	}
+
+	// read in environment variables that match
+	v.viper.AutomaticEnv()
+	if v.Prefix == "" {
+		return errors.E(op, errors.Str("prefix should be set"))
+	}
+
+	v.viper.SetEnvPrefix(v.Prefix)
+	if v.Path == "" {
+		return errors.E(op, errors.Str("path should be set"))
+	}
+
+	v.viper.SetConfigFile(v.Path)
+	v.viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
+
+	return v.viper.ReadInConfig()
+}
+
+// Overwrite overwrites existing config with provided values
+func (v *Viper) Overwrite(values map[string]interface{}) error {
+	if len(values) != 0 {
+		for key, value := range values {
+			v.viper.Set(key, value)
+		}
+	}
+
+	return nil
+}
+
+// UnmarshalKey reads configuration section into configuration object.
+func (v *Viper) UnmarshalKey(name string, out interface{}) error {
+	const op = errors.Op("unmarshal key")
+	err := v.viper.UnmarshalKey(name, &out)
+	if err != nil {
+		return errors.E(op, err)
+	}
+	return nil
+}
+
+// Get raw config in a form of config section.
+func (v *Viper) Get(name string) interface{} {
+	return v.viper.Get(name)
+}
+
+// Has checks if config section exists.
+func (v *Viper) Has(name string) bool {
+	return v.viper.IsSet(name)
+}