first commit

3 years ago · 913ca9672d
55 changed files with 4355 additions and 0 deletions
--- a/.drone.yml
+++ b/.drone.yml
@ -0,0 +1,26 @@
+kind: pipeline
+name: default
+
+services:
+  - name: vault
+    image: vault
+    environment:
+      VAULT_DEV_ROOT_TOKEN_ID: dev
+  - name: etcd
+    image: bitnami/etcd
+
+environment:
+  VAULT_DEV_LISTEN_ADDRESS: vault:8200
+  VAULT_DEV_ROOT_TOKEN_ID: dev
+  FDEVS_CONFIG_ETCD_HOST: etcd:2379
+
+steps:
+- name: test 
+  image: golang
+  commands:
+  - go test -parallel 10 -race ./... 
+
+- name: golangci-lint
+  image: golangci/golangci-lint:v1.39
+  commands:
+  - golangci-lint run
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1,17 @@
+# ---> Go
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
--- a/.golangci.yml
+++ b/.golangci.yml
@ -0,0 +1,46 @@
+run:
+  timeout: 5m
+
+linters-settings:
+    dupl:
+      threshold: 100
+    funlen:
+      lines: 100
+      statements: 50
+    goconst:
+      min-len: 2
+      min-occurrences: 2
+    gocyclo:
+      min-complexity: 15
+    golint:
+      min-confidence: 0
+    govet:
+      check-shadowing: true
+    lll:
+      line-length: 140
+    maligned:
+      suggest-new: true
+    misspell:
+      locale: US  
+
+linters:
+    enable-all: true
+    disable:
+      - exhaustivestruct
+      - maligned
+      - interfacer
+      - scopelint
+
+issues:
+  # Excluding configuration per-path, per-linter, per-text and per-source
+  exclude-rules:
+    - path: _test\.go
+      linters:
+        - gomnd
+        - exhaustivestruct
+        - wrapcheck
+    - path: test/*
+      linters:
+        - gomnd
+        - exhaustivestruct
+        - wrapcheck
--- a/19
+++ b/19
@ -0,0 +1,19 @@
+MIT License Copyright (c) 2020 4devs
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice (including the next
+paragraph) shall be included in all copies or substantial portions of the
+Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
+OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
--- a/README.md
+++ b/README.md
@ -0,0 +1,5 @@
+# config
+
+[![Build Status](https://drone.gitoa.ru/api/badges/go-4devs/cache/status.svg)](https://drone.gitoa.ru/go-4devs/config)
+[![Go Report Card](https://goreportcard.com/badge/gitoa.ru/go-4devs/config)](https://goreportcard.com/report/gitoa.ru/go-4devs/config)
+[![GoDoc](https://godoc.org/gitoa.ru/go-4devs/config?status.svg)](http://godoc.org/gitoa.ru/go-4devs/config)
--- a/client.go
+++ b/client.go
@ -0,0 +1,96 @@
+package config
+
+import (
+	"context"
+	"errors"
+	"fmt"
+)
+
+func New(namespace, appName string, providers []Provider) *Client {
+	return &Client{
+		namespace: namespace,
+		appName:   appName,
+		providers: providers,
+	}
+}
+
+type Client struct {
+	providers []Provider
+	appName   string
+	namespace string
+}
+
+func (c *Client) key(name string) Key {
+	return Key{
+		Name:      name,
+		AppName:   c.appName,
+		Namespace: c.namespace,
+	}
+}
+
+func (c *Client) Value(ctx context.Context, name string) (Value, error) {
+	variable, err := c.Variable(ctx, name)
+	if err != nil {
+		return nil, err
+	}
+
+	return variable.Value, nil
+}
+
+func (c *Client) Variable(ctx context.Context, name string) (Variable, error) {
+	var (
+		variable Variable
+		err      error
+	)
+
+	key := c.key(name)
+
+	for _, provider := range c.providers {
+		variable, err = provider.Read(ctx, key)
+		if err == nil || !errors.Is(err, ErrVariableNotFound) {
+			break
+		}
+	}
+
+	if err != nil {
+		return variable, fmt.Errorf("client failed get variable: %w", err)
+	}
+
+	return variable, nil
+}
+
+func NewWatch(namespace, appName string, providers []Provider) *WatchClient {
+	cl := WatchClient{
+		Client: New(namespace, appName, providers),
+	}
+
+	for _, provider := range providers {
+		if watch, ok := provider.(WatchProvider); ok {
+			cl.providers = append(cl.providers, watch)
+		}
+	}
+
+	return &cl
+}
+
+type WatchClient struct {
+	*Client
+	providers []WatchProvider
+}
+
+func (wc *WatchClient) Watch(ctx context.Context, name string, callback WatchCallback) error {
+	key := wc.key(name)
+
+	for _, provider := range wc.providers {
+		err := provider.Watch(ctx, key, callback)
+		if err != nil {
+			if errors.Is(err, ErrVariableNotFound) {
+				continue
+			}
+
+			return fmt.Errorf("client: failed watch by provider %s: %w", provider.Name(), err)
+		}
+	}
+
+	return nil
+}
--- a/client_example_test.go
+++ b/client_example_test.go
@ -0,0 +1,198 @@
+package config_test
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"os"
+	"sync"
+	"time"
+
+	"gitoa.ru/go-4devs/config"
+	"gitoa.ru/go-4devs/config/provider/arg"
+	"gitoa.ru/go-4devs/config/provider/env"
+	"gitoa.ru/go-4devs/config/provider/etcd"
+	"gitoa.ru/go-4devs/config/provider/json"
+	"gitoa.ru/go-4devs/config/provider/vault"
+	"gitoa.ru/go-4devs/config/provider/watcher"
+	"gitoa.ru/go-4devs/config/provider/yaml"
+	"gitoa.ru/go-4devs/config/test"
+)
+
+func ExampleNew() {
+	ctx := context.Background()
+	_ = os.Setenv("FDEVS_CONFIG_LISTEN", "8080")
+	_ = os.Setenv("FDEVS_CONFIG_HOST", "localhost")
+
+	args := os.Args
+
+	defer func() {
+		os.Args = args
+	}()
+
+	os.Args = []string{"main.go", "--host=gitoa.ru"}
+
+	// configure etcd client
+	etcdClient, err := test.NewEtcd(ctx)
+	if err != nil {
+		log.Print(err)
+
+		return
+	}
+
+	// configure vault client
+	vaultClient, err := test.NewVault()
+	if err != nil {
+		log.Print(err)
+
+		return
+	}
+
+	// read json config
+	jsonConfig := test.ReadFile("config.json")
+
+	providers := []config.Provider{
+		arg.New(),
+		env.New(),
+		etcd.NewProvider(etcdClient),
+		vault.NewSecretKV2(vaultClient),
+		json.New(jsonConfig),
+	}
+	config := config.New(test.Namespace, test.AppName, providers)
+
+	dsn, err := config.Value(ctx, "example:dsn")
+	if err != nil {
+		log.Print(err)
+
+		return
+	}
+
+	port, err := config.Value(ctx, "listen")
+	if err != nil {
+		log.Print(err)
+
+		return
+	}
+
+	enabled, err := config.Value(ctx, "maintain")
+	if err != nil {
+		log.Print(err)
+
+		return
+	}
+
+	title, err := config.Value(ctx, "app.name.title")
+	if err != nil {
+		log.Print(err)
+
+		return
+	}
+
+	cfgValue, err := config.Value(ctx, "cfg")
+	if err != nil {
+		log.Print(err)
+
+		return
+	}
+
+	hostValue, err := config.Value(ctx, "host")
+	if err != nil {
+		log.Print(err)
+
+		return
+	}
+
+	cfg := test.Config{}
+	_ = cfgValue.Unmarshal(&cfg)
+
+	fmt.Printf("dsn from vault: %s\n", dsn.String())
+	fmt.Printf("listen from env: %d\n", port.Int())
+	fmt.Printf("maintain from etcd: %v\n", enabled.Bool())
+	fmt.Printf("title from json: %v\n", title.String())
+	fmt.Printf("struct from json: %+v\n", cfg)
+	fmt.Printf("replace env host by args: %v\n", hostValue.String())
+	// Output:
+	// dsn from vault: pgsql://user@pass:127.0.0.1:5432
+	// listen from env: 8080
+	// maintain from etcd: true
+	// title from json: config title
+	// struct from json: {Duration:21m0s Enabled:true}
+	// replace env host by args: gitoa.ru
+}
+
+func ExampleNewWatch() {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	// configure etcd client
+	etcdClient, err := test.NewEtcd(ctx)
+	if err != nil {
+		log.Print(err)
+
+		return
+	}
+
+	_ = os.Setenv("FDEVS_CONFIG_EXAMPLE_ENABLE", "true")
+
+	_, err = etcdClient.KV.Put(ctx, "fdevs/config/example_db_dsn", "pgsql://user@pass:127.0.0.1:5432")
+	if err != nil {
+		log.Print(err)
+
+		return
+	}
+
+	defer func() {
+		cancel()
+
+		if _, err = etcdClient.KV.Delete(context.Background(), "fdevs/config/example_db_dsn"); err != nil {
+			log.Print(err)
+
+			return
+		}
+	}()
+
+	providers := []config.Provider{
+		watcher.New(time.Microsecond, env.New()),
+		watcher.New(time.Microsecond, yaml.NewFile("test/fixture/config.yaml")),
+		etcd.NewProvider(etcdClient),
+	}
+	watcher := config.NewWatch(test.Namespace, test.AppName, providers)
+	wg := sync.WaitGroup{}
+	wg.Add(2)
+
+	err = watcher.Watch(ctx, "example_enable", func(ctx context.Context, oldVar, newVar config.Variable) {
+		fmt.Println("update ", oldVar.Provider, " variable:", oldVar.Name, ", old: ", oldVar.Value.Bool(), " new:", newVar.Value.Bool())
+		wg.Done()
+	})
+	if err != nil {
+		log.Print(err)
+
+		return
+	}
+
+	_ = os.Setenv("FDEVS_CONFIG_EXAMPLE_ENABLE", "false")
+
+	err = watcher.Watch(ctx, "example_db_dsn", func(ctx context.Context, oldVar, newVar config.Variable) {
+		fmt.Println("update ", oldVar.Provider, " variable:", oldVar.Name, ", old: ", oldVar.Value.String(), " new:", newVar.Value.String())
+		wg.Done()
+	})
+	if err != nil {
+		log.Print(err)
+
+		return
+	}
+
+	time.AfterFunc(time.Second, func() {
+		if _, err := etcdClient.KV.Put(ctx, "fdevs/config/example_db_dsn", "mysql://localhost:5432"); err != nil {
+			log.Print(err)
+
+			return
+		}
+	})
+
+	wg.Wait()
+
+	// Output:
+	// update  env  variable: FDEVS_CONFIG_EXAMPLE_ENABLE , old:  true  new: false
+	// update  etcd  variable: fdevs/config/example_db_dsn , old:  pgsql://user@pass:127.0.0.1:5432  new: mysql://localhost:5432
+}
--- a/docker-compose.yml
+++ b/docker-compose.yml
@ -0,0 +1,17 @@
+version: '3'
+
+services:
+  vault:
+    image: vault:latest
+    cap_add:
+      - IPC_LOCK
+    ports:
+      - "8200:8200"
+    environment: 
+      VAULT_DEV_ROOT_TOKEN_ID: "dev"
+  etcd:
+    image: bitnami/etcd
+    environment: 
+      ALLOW_NONE_AUTHENTICATION: "yes"
+    ports: 
+      - "2379:2379"
--- a/error.go
+++ b/error.go
@ -0,0 +1,8 @@
+package config
+
+import "errors"
+
+var (
+	ErrVariableNotFound = errors.New("variable not found")
+	ErrInvalidValue     = errors.New("invalid value")
+)
--- a/go.mod
+++ b/go.mod
@ -0,0 +1,15 @@
+module gitoa.ru/go-4devs/config
+
+go 1.16
+
+require (
+	github.com/hashicorp/vault/api v1.1.0
+	github.com/pelletier/go-toml v1.9.0
+	github.com/smartystreets/goconvey v1.6.4 // indirect
+	github.com/stretchr/testify v1.7.0
+	github.com/tidwall/gjson v1.7.5
+	go.etcd.io/etcd/api/v3 v3.5.0-alpha.0
+	go.etcd.io/etcd/client/v3 v3.5.0-alpha.0
+	gopkg.in/ini.v1 v1.62.0
+	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
+)
--- a/go.sum
+++ b/go.sum
@ -0,0 +1,317 @@
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+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=
+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.1-2019.2.3 h1:3JgtbtFHMiCmsznwGVTUWbgGov+pVqnlf1dEJTNAXeM=
+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=
--- a/key.go
+++ b/key.go
@ -0,0 +1,15 @@
+package config
+
+import "context"
+
+type Key struct {
+	Name      string
+	AppName   string
+	Namespace string
+}
+
+type KeyFactory func(ctx context.Context, key Key) string
+
+func (k Key) String() string {
+	return k.Namespace + "_" + k.AppName + "_" + k.Name
+}
--- a/key/helpers.go
+++ b/key/helpers.go
@ -0,0 +1,32 @@
+package key
+
+import (
+	"context"
+	"strings"
+
+	"gitoa.ru/go-4devs/config"
+)
+
+func LastIndex(sep string, factory config.KeyFactory) func(ctx context.Context, key config.Key) (string, string) {
+	return func(ctx context.Context, key config.Key) (string, string) {
+		k := factory(ctx, key)
+
+		idx := strings.LastIndex(k, sep)
+		if idx == -1 {
+			return k, ""
+		}
+
+		return k[0:idx], k[idx+len(sep):]
+	}
+}
+
+func LastIndexField(sep, def string, factory config.KeyFactory) func(ctx context.Context, key config.Key) (string, string) {
+	return func(ctx context.Context, key config.Key) (string, string) {
+		p, k := LastIndex(sep, factory)(ctx, key)
+		if k == "" {
+			return p, def
+		}
+
+		return p, k
+	}
+}
--- a/key/helpers_test.go
+++ b/key/helpers_test.go
@ -0,0 +1,64 @@
+package key_test
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"gitoa.ru/go-4devs/config"
+	"gitoa.ru/go-4devs/config/key"
+)
+
+func TestLastIndex(t *testing.T) {
+	t.Parallel()
+
+	ctx := context.Background()
+
+	cases := map[string]struct {
+		sep   string
+		path  string
+		field string
+	}{
+		"/secret/with/field/name": {
+			sep:   "/",
+			path:  "/secret/with/field",
+			field: "name",
+		},
+		"/secret/database:username": {
+			sep:   ":",
+			path:  "/secret/database",
+			field: "username",
+		},
+		"database:username": {
+			sep:   ":",
+			path:  "database",
+			field: "username",
+		},
+		"/secret/database-dsn": {
+			sep:   ":",
+			path:  "/secret/database-dsn",
+			field: "",
+		},
+		"/secret/database--dsn": {
+			sep:   "--",
+			path:  "/secret/database",
+			field: "dsn",
+		},
+		"/secret/database:dsn": {
+			sep:   "--",
+			path:  "/secret/database:dsn",
+			field: "",
+		},
+	}
+
+	for path, data := range cases {
+		k := config.Key{
+			Name: path,
+		}
+
+		fn := key.LastIndex(data.sep, key.Name)
+		ns, field := fn(ctx, k)
+		assert.Equal(t, data.field, field, k)
+		assert.Equal(t, data.path, ns, k)
+	}
+}
--- a/key/key.go
+++ b/key/key.go
@ -0,0 +1,46 @@
+package key
+
+import (
+	"context"
+	"strings"
+
+	"gitoa.ru/go-4devs/config"
+)
+
+func NsAppName(sep string) config.KeyFactory {
+	return func(_ context.Context, key config.Key) string {
+		return strings.Join([]string{key.Namespace, key.AppName, key.Name}, sep)
+	}
+}
+
+func AppName(sep string) config.KeyFactory {
+	return func(_ context.Context, key config.Key) string {
+		return strings.Join([]string{key.AppName, key.Name}, sep)
+	}
+}
+
+func PrefixName(prefix string, factory config.KeyFactory) config.KeyFactory {
+	return func(ctx context.Context, key config.Key) string {
+		return prefix + factory(ctx, key)
+	}
+}
+
+func Name(_ context.Context, key config.Key) string {
+	return key.Name
+}
+
+func AliasName(name string, alias string, def config.KeyFactory) config.KeyFactory {
+	return func(ctx context.Context, key config.Key) string {
+		if name == key.Name {
+			return alias
+		}
+
+		return def(ctx, key)
+	}
+}
+
+func ReplaceAll(oldVal, newVal string, parent config.KeyFactory) config.KeyFactory {
+	return func(ctx context.Context, key config.Key) string {
+		return strings.ReplaceAll(parent(ctx, key), oldVal, newVal)
+	}
+}
--- a/provider.go
+++ b/provider.go
@ -0,0 +1,19 @@
+package config
+
+import "context"
+
+type Provider interface {
+	Read(ctx context.Context, key Key) (Variable, error)
+	NamedProvider
+}
+
+type WatchCallback func(ctx context.Context, oldVar, newVar Variable)
+
+type WatchProvider interface {
+	Watch(ctx context.Context, key Key, callback WatchCallback) error
+	NamedProvider
+}
+
+type NamedProvider interface {
+	Name() string
+}
--- a/provider/arg/provider.go
+++ b/provider/arg/provider.go
@ -0,0 +1,136 @@
+package arg
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"strings"
+
+	"gitoa.ru/go-4devs/config"
+	"gitoa.ru/go-4devs/config/key"
+	"gitoa.ru/go-4devs/config/value"
+	"gopkg.in/yaml.v3"
+)
+
+var _ config.Provider = (*Provider)(nil)
+
+type Option func(*Provider)
+
+func WithKeyFactory(factory config.KeyFactory) Option {
+	return func(p *Provider) { p.key = factory }
+}
+
+func New(opts ...Option) *Provider {
+	p := Provider{
+		key: key.Name,
+	}
+
+	for _, opt := range opts {
+		opt(&p)
+	}
+
+	return &p
+}
+
+type Provider struct {
+	args map[string][]string
+	key  config.KeyFactory
+}
+
+// nolint: cyclop
+func (p *Provider) parseOne(arg string) (name, val string, err error) {
+	if arg[0] != '-' {
+		return
+	}
+
+	numMinuses := 1
+
+	if arg[1] == '-' {
+		numMinuses++
+	}
+
+	name = strings.TrimSpace(arg[numMinuses:])
+	if len(name) == 0 {
+		return
+	}
+
+	if name[0] == '-' || name[0] == '=' {
+		return "", "", fmt.Errorf("%w: bad flag syntax: %s", config.ErrInvalidValue, arg)
+	}
+
+	for i := 1; i < len(name); i++ {
+		if name[i] == '=' || name[i] == ' ' {
+			val = strings.TrimSpace(name[i+1:])
+			name = name[0:i]
+
+			break
+		}
+	}
+
+	if val == "" && numMinuses == 1 && len(arg) > 2 {
+		name, val = name[:1], name[1:]
+	}
+
+	return name, val, nil
+}
+
+func (p *Provider) parse() error {
+	if len(p.args) > 0 {
+		return nil
+	}
+
+	p.args = make(map[string][]string, len(os.Args[1:]))
+
+	for _, arg := range os.Args[1:] {
+		name, value, err := p.parseOne(arg)
+		if err != nil {
+			return err
+		}
+
+		if name != "" {
+			p.args[name] = append(p.args[name], value)
+		}
+	}
+
+	return nil
+}
+
+func (p *Provider) Name() string {
+	return "arg"
+}
+
+func (p *Provider) IsSupport(ctx context.Context, key config.Key) bool {
+	return p.key(ctx, key) != ""
+}
+
+func (p *Provider) Read(ctx context.Context, key config.Key) (config.Variable, error) {
+	if err := p.parse(); err != nil {
+		return config.Variable{Provider: p.Name()}, err
+	}
+
+	k := p.key(ctx, key)
+	if val, ok := p.args[k]; ok {
+		switch {
+		case len(val) == 1:
+			return config.Variable{
+				Name:     k,
+				Provider: p.Name(),
+				Value:    value.JString(val[0]),
+			}, nil
+		default:
+			var n yaml.Node
+
+			if err := yaml.Unmarshal([]byte("["+strings.Join(val, ",")+"]"), &n); err != nil {
+				return config.Variable{}, fmt.Errorf("arg: failed unmarshal yaml:%w", err)
+			}
+
+			return config.Variable{
+				Name:     k,
+				Provider: p.Name(),
+				Value:    value.Decode(n.Decode),
+			}, nil
+		}
+	}
+
+	return config.Variable{Name: k, Provider: p.Name()}, config.ErrVariableNotFound
+}
--- a/provider/arg/provider_test.go
+++ b/provider/arg/provider_test.go
@ -0,0 +1,48 @@
+package arg_test
+
+import (
+	"os"
+	"testing"
+	"time"
+
+	"gitoa.ru/go-4devs/config/provider/arg"
+	"gitoa.ru/go-4devs/config/test"
+)
+
+func TestProvider(t *testing.T) {
+	t.Parallel()
+
+	args := os.Args
+
+	defer func() {
+		os.Args = args
+	}()
+
+	os.Args = []string{
+		"main.go",
+		"--listen=8080",
+		"--config=config.hcl",
+		"--url=http://4devs.io",
+		"--url=https://4devs.io",
+		"--timeout=1m",
+		"--timeout=1h",
+		"--start-at=2010-01-02T15:04:05Z",
+		"--end-after=2009-01-02T15:04:05Z",
+		"--end-after=2008-01-02T15:04:05+03:00",
+	}
+	read := []test.Read{
+		test.NewRead("listen", 8080),
+		test.NewRead("config", "config.hcl"),
+		test.NewRead("start-at", test.Time("2010-01-02T15:04:05Z")),
+		test.NewReadUnmarshal("url", &[]string{"http://4devs.io", "https://4devs.io"}, &[]string{}),
+		test.NewReadUnmarshal("timeout", &[]time.Duration{time.Minute, time.Hour}, &[]time.Duration{}),
+		test.NewReadUnmarshal("end-after", &[]time.Time{
+			test.Time("2009-01-02T15:04:05Z"),
+			test.Time("2008-01-02T15:04:05+03:00"),
+		}, &[]time.Time{}),
+	}
+
+	prov := arg.New()
+
+	test.Run(t, prov, read)
+}
--- a/provider/env/provider.go
+++ b/provider/env/provider.go
@ -0,0 +1,61 @@
+package env
+
+import (
+	"context"
+	"os"
+	"strings"
+
+	"gitoa.ru/go-4devs/config"
+	"gitoa.ru/go-4devs/config/key"
+	"gitoa.ru/go-4devs/config/value"
+)
+
+var _ config.Provider = (*Provider)(nil)
+
+type Option func(*Provider)
+
+func WithKeyFactory(factory config.KeyFactory) Option {
+	return func(p *Provider) { p.key = factory }
+}
+
+func New(opts ...Option) *Provider {
+	p := Provider{
+		key: func(ctx context.Context, k config.Key) string {
+			return strings.ToUpper(key.NsAppName("_")(ctx, k))
+		},
+	}
+
+	for _, opt := range opts {
+		opt(&p)
+	}
+
+	return &p
+}
+
+type Provider struct {
+	key config.KeyFactory
+}
+
+func (p *Provider) Name() string {
+	return "env"
+}
+
+func (p *Provider) IsSupport(ctx context.Context, key config.Key) bool {
+	return p.key(ctx, key) != ""
+}
+
+func (p *Provider) Read(ctx context.Context, key config.Key) (config.Variable, error) {
+	k := p.key(ctx, key)
+	if val, ok := os.LookupEnv(k); ok {
+		return config.Variable{
+			Name:     k,
+			Provider: p.Name(),
+			Value:    value.JString(val),
+		}, nil
+	}
+
+	return config.Variable{
+		Name:     k,
+		Provider: p.Name(),
+	}, config.ErrVariableNotFound
+}
--- a/provider/env/provider_test.go
+++ b/provider/env/provider_test.go
@ -0,0 +1,24 @@
+package env_test
+
+import (
+	"os"
+	"testing"
+
+	"gitoa.ru/go-4devs/config/provider/env"
+	"gitoa.ru/go-4devs/config/test"
+)
+
+func TestProvider(t *testing.T) {
+	t.Parallel()
+
+	os.Setenv("FDEVS_CONFIG_DSN", test.DSN)
+	os.Setenv("FDEVS_CONFIG_PORT", "8080")
+
+	provider := env.New()
+
+	read := []test.Read{
+		test.NewRead("dsn", test.DSN),
+		test.NewRead("port", 8080),
+	}
+	test.Run(t, provider, read)
+}
--- a/provider/etcd/provider.go
+++ b/provider/etcd/provider.go
@ -0,0 +1,113 @@
+package etcd
+
+import (
+	"context"
+	"fmt"
+	"log"
+
+	"gitoa.ru/go-4devs/config"
+	"gitoa.ru/go-4devs/config/key"
+	"gitoa.ru/go-4devs/config/value"
+	pb "go.etcd.io/etcd/api/v3/mvccpb"
+	client "go.etcd.io/etcd/client/v3"
+)
+
+var (
+	_ config.Provider      = (*Provider)(nil)
+	_ config.WatchProvider = (*Provider)(nil)
+)
+
+type Client interface {
+	client.KV
+	client.Watcher
+}
+
+func NewProvider(client Client) *Provider {
+	p := Provider{
+		client: client,
+		key:    key.NsAppName("/"),
+	}
+
+	return &p
+}
+
+type Provider struct {
+	client Client
+	key    config.KeyFactory
+}
+
+func (p *Provider) IsSupport(ctx context.Context, key config.Key) bool {
+	return p.key(ctx, key) != ""
+}
+
+func (p *Provider) Name() string {
+	return "etcd"
+}
+
+func (p *Provider) Read(ctx context.Context, key config.Key) (config.Variable, error) {
+	k := p.key(ctx, key)
+
+	resp, err := p.client.Get(ctx, k, client.WithPrefix())
+	if err != nil {
+		return config.Variable{}, fmt.Errorf("%w: key:%s, prov:%s", err, k, p.Name())
+	}
+
+	val, err := p.resolve(k, resp.Kvs)
+	if err != nil {
+		return config.Variable{}, fmt.Errorf("%w: key:%s, prov:%s", err, k, p.Name())
+	}
+
+	return val, nil
+}
+
+func (p *Provider) Watch(ctx context.Context, key config.Key, callback config.WatchCallback) error {
+	go func(ctx context.Context, key string, callback config.WatchCallback) {
+		watch := p.client.Watch(ctx, key, client.WithPrevKV(), client.WithPrefix())
+		for w := range watch {
+			kvs, olds := p.getEventKvs(w.Events)
+			if len(kvs) > 0 {
+				newVar, _ := p.resolve(key, kvs)
+				oldVar, _ := p.resolve(key, olds)
+				callback(ctx, oldVar, newVar)
+			}
+		}
+	}(ctx, p.key(ctx, key), callback)
+
+	return nil
+}
+
+func (p *Provider) getEventKvs(events []*client.Event) ([]*pb.KeyValue, []*pb.KeyValue) {
+	kvs := make([]*pb.KeyValue, 0, len(events))
+	old := make([]*pb.KeyValue, 0, len(events))
+
+	for i := range events {
+		kvs = append(kvs, events[i].Kv)
+		old = append(old, events[i].PrevKv)
+		log.Println(events[i].Type)
+	}
+
+	return kvs, old
+}
+
+func (p *Provider) resolve(key string, kvs []*pb.KeyValue) (config.Variable, error) {
+	for _, kv := range kvs {
+		switch {
+		case kv == nil:
+			return config.Variable{
+				Name:     key,
+				Provider: p.Name(),
+			}, nil
+		case string(kv.Key) == key:
+			return config.Variable{
+				Value:    value.JBytes(kv.Value),
+				Name:     key,
+				Provider: p.Name(),
+			}, nil
+		}
+	}
+
+	return config.Variable{
+		Name:     key,
+		Provider: p.Name(),
+	}, config.ErrVariableNotFound
+}
--- a/provider/etcd/provider_test.go
+++ b/provider/etcd/provider_test.go
@ -0,0 +1,119 @@
+package etcd_test
+
+import (
+	"context"
+	"fmt"
+	"sync"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"gitoa.ru/go-4devs/config"
+	"gitoa.ru/go-4devs/config/provider/etcd"
+	"gitoa.ru/go-4devs/config/test"
+)
+
+func TestProvider(t *testing.T) {
+	t.Parallel()
+
+	ctx := context.Background()
+
+	et, err := test.NewEtcd(ctx)
+	require.NoError(t, err)
+
+	provider := etcd.NewProvider(et)
+	read := []test.Read{
+		test.NewRead("db_dsn", test.DSN),
+		test.NewRead("duration", 12*time.Minute),
+		test.NewRead("port", 8080),
+		test.NewRead("maintain", true),
+		test.NewRead("start_at", test.Time("2020-01-02T15:04:05Z")),
+		test.NewRead("percent", .064),
+		test.NewRead("count", uint(2020)),
+		test.NewRead("int64", int64(2021)),
+		test.NewRead("uint64", int64(2022)),
+		test.NewReadConfig("config"),
+	}
+	test.Run(t, provider, read)
+}
+
+func value(cnt int32) string {
+	return fmt.Sprintf("test data: %d", cnt)
+}
+
+func TestWatcher(t *testing.T) {
+	t.Parallel()
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	key := config.Key{
+		AppName:   "config",
+		Namespace: "fdevs",
+		Name:      "test_watch",
+	}
+
+	et, err := test.NewEtcd(ctx)
+	require.NoError(t, err)
+
+	defer func() {
+		_, err = et.KV.Delete(context.Background(), "fdevs/config/test_watch")
+		require.NoError(t, err)
+	}()
+
+	var cnt, cnt2 int32
+
+	prov := etcd.NewProvider(et)
+	wg := sync.WaitGroup{}
+	wg.Add(6)
+
+	watch := func(cnt *int32) func(ctx context.Context, oldVar, newVar config.Variable) {
+		return func(ctx context.Context, oldVar, newVar config.Variable) {
+			switch *cnt {
+			case 0:
+				assert.Equal(t, value(*cnt), newVar.Value.String())
+				assert.Nil(t, oldVar.Value)
+			case 1:
+				assert.Equal(t, value(*cnt), newVar.Value.String())
+				assert.Equal(t, value(*cnt-1), oldVar.Value.String())
+			case 2:
+				_, perr := newVar.Value.ParseString()
+				assert.NoError(t, perr)
+				assert.Equal(t, "", newVar.Value.String())
+				assert.Equal(t, value(*cnt-1), oldVar.Value.String())
+			default:
+				assert.Fail(t, "unexpected watch")
+			}
+
+			wg.Done()
+			atomic.AddInt32(cnt, 1)
+		}
+	}
+
+	err = prov.Watch(ctx, key, watch(&cnt))
+	err = prov.Watch(ctx, key, watch(&cnt2))
+	require.NoError(t, err)
+
+	time.AfterFunc(time.Second, func() {
+		_, err = et.KV.Put(ctx, "fdevs/config/test_watch", value(0))
+		require.NoError(t, err)
+		_, err = et.KV.Put(ctx, "fdevs/config/test_watch", value(1))
+		require.NoError(t, err)
+		_, err = et.KV.Delete(ctx, "fdevs/config/test_watch")
+		require.NoError(t, err)
+	})
+
+	time.AfterFunc(time.Second*10, func() {
+		assert.Fail(t, "failed watch after 5 sec")
+		cancel()
+	})
+
+	go func() {
+		wg.Wait()
+		cancel()
+	}()
+
+	<-ctx.Done()
+}
--- a/provider/ini/provider.go
+++ b/provider/ini/provider.go
@ -0,0 +1,62 @@
+package ini
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"gitoa.ru/go-4devs/config"
+	"gitoa.ru/go-4devs/config/value"
+	"gopkg.in/ini.v1"
+)
+
+var _ config.Provider = (*Provider)(nil)
+
+func New(data *ini.File) *Provider {
+	return &Provider{
+		data: data,
+		resolve: func(ctx context.Context, key config.Key) (string, string) {
+			keys := strings.SplitN(key.Name, "/", 2)
+			if len(keys) == 1 {
+				return "", keys[0]
+			}
+
+			return keys[0], keys[1]
+		},
+	}
+}
+
+type Provider struct {
+	data    *ini.File
+	resolve func(ctx context.Context, key config.Key) (string, string)
+}
+
+func (p *Provider) IsSupport(ctx context.Context, key config.Key) bool {
+	section, name := p.resolve(ctx, key)
+
+	return section != "" && name != ""
+}
+
+func (p *Provider) Name() string {
+	return "ini"
+}
+
+func (p *Provider) Read(ctx context.Context, key config.Key) (config.Variable, error) {
+	section, name := p.resolve(ctx, key)
+
+	iniSection, err := p.data.GetSection(section)
+	if err != nil {
+		return config.Variable{}, fmt.Errorf("%w: %s: %v", config.ErrVariableNotFound, p.Name(), err)
+	}
+
+	iniKey, err := iniSection.GetKey(name)
+	if err != nil {
+		return config.Variable{}, fmt.Errorf("%w: %s: %v", config.ErrVariableNotFound, p.Name(), err)
+	}
+
+	return config.Variable{
+		Name:     section + ":" + name,
+		Provider: p.Name(),
+		Value:    value.JString(iniKey.String()),
+	}, nil
+}
--- a/provider/ini/provider_test.go
+++ b/provider/ini/provider_test.go
@ -0,0 +1,28 @@
+package ini_test
+
+import (
+	"testing"
+	"time"
+
+	"gitoa.ru/go-4devs/config/provider/ini"
+	"gitoa.ru/go-4devs/config/test"
+)
+
+func TestProvider(t *testing.T) {
+	t.Parallel()
+
+	file := test.NewINI()
+
+	read := []test.Read{
+		test.NewRead("project/PROJECT_BOARD_BASIC_KANBAN_TYPE", "To Do, In Progress, Done"),
+		test.NewRead("repository.editor/PREVIEWABLE_FILE_MODES", "markdown"),
+		test.NewRead("server/LOCAL_ROOT_URL", "http://0.0.0.0:3000/"),
+		test.NewRead("server/LFS_HTTP_AUTH_EXPIRY", 20*time.Minute),
+		test.NewRead("repository.pull-request/DEFAULT_MERGE_MESSAGE_SIZE", 5120),
+		test.NewRead("ui/SHOW_USER_EMAIL", true),
+		test.NewRead("cors/ENABLED", false),
+	}
+
+	prov := ini.New(file)
+	test.Run(t, prov, read)
+}
--- a/provider/json/provider.go
+++ b/provider/json/provider.go
@ -0,0 +1,66 @@
+package json
+
+import (
+	"context"
+	"fmt"
+	"io/ioutil"
+	"path/filepath"
+
+	"github.com/tidwall/gjson"
+	"gitoa.ru/go-4devs/config"
+	"gitoa.ru/go-4devs/config/key"
+	"gitoa.ru/go-4devs/config/value"
+)
+
+var _ config.Provider = (*Provider)(nil)
+
+func New(json []byte, opts ...Option) *Provider {
+	provider := Provider{
+		key:  key.Name,
+		data: json,
+	}
+
+	for _, opt := range opts {
+		opt(&provider)
+	}
+
+	return &provider
+}
+
+func NewFile(path string, opts ...Option) (*Provider, error) {
+	file, err := ioutil.ReadFile(filepath.Clean(path))
+	if err != nil {
+		return nil, fmt.Errorf("%w: unable to read config file %#q: file not found or unreadable", err, path)
+	}
+
+	return New(file), nil
+}
+
+type Option func(*Provider)
+
+type Provider struct {
+	data []byte
+	key  config.KeyFactory
+}
+
+func (p *Provider) IsSupport(ctx context.Context, key config.Key) bool {
+	return p.key(ctx, key) != ""
+}
+
+func (p *Provider) Name() string {
+	return "json"
+}
+
+func (p *Provider) Read(ctx context.Context, key config.Key) (config.Variable, error) {
+	path := p.key(ctx, key)
+
+	if val := gjson.GetBytes(p.data, path); val.Exists() {
+		return config.Variable{
+			Name:     path,
+			Provider: p.Name(),
+			Value:    value.JString(val.String()),
+		}, nil
+	}
+
+	return config.Variable{}, config.ErrVariableNotFound
+}
--- a/provider/json/provider_test.go
+++ b/provider/json/provider_test.go
@ -0,0 +1,27 @@
+package json_test
+
+import (
+	"testing"
+	"time"
+
+	provider "gitoa.ru/go-4devs/config/provider/json"
+	"gitoa.ru/go-4devs/config/test"
+)
+
+func TestProvider(t *testing.T) {
+	t.Parallel()
+
+	js := test.ReadFile("config.json")
+
+	prov := provider.New(js)
+	sl := []string{}
+	read := []test.Read{
+		test.NewRead("app.name.title", "config title"),
+		test.NewRead("app.name.timeout", time.Minute),
+		test.NewReadUnmarshal("app.name.var", &[]string{"name"}, &sl),
+		test.NewReadConfig("cfg"),
+		test.NewRead("app.name.success", true),
+	}
+
+	test.Run(t, prov, read)
+}
--- a/provider/toml/provider.go
+++ b/provider/toml/provider.go
@ -0,0 +1,71 @@
+package toml
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/pelletier/go-toml"
+	"gitoa.ru/go-4devs/config"
+	"gitoa.ru/go-4devs/config/key"
+	"gitoa.ru/go-4devs/config/value"
+)
+
+var _ config.Provider = (*Provider)(nil)
+
+func NewFile(file string, opts ...Option) (*Provider, error) {
+	tree, err := toml.LoadFile(file)
+	if err != nil {
+		return nil, fmt.Errorf("toml: failed load file: %w", err)
+	}
+
+	return configure(tree, opts...), nil
+}
+
+type Option func(*Provider)
+
+func configure(tree *toml.Tree, opts ...Option) *Provider {
+	p := &Provider{
+		tree: tree,
+		key:  key.Name,
+	}
+
+	for _, opt := range opts {
+		opt(p)
+	}
+
+	return p
+}
+
+func New(data []byte, opts ...Option) (*Provider, error) {
+	tree, err := toml.LoadBytes(data)
+	if err != nil {
+		return nil, fmt.Errorf("toml failed load data: %w", err)
+	}
+
+	return configure(tree, opts...), nil
+}
+
+type Provider struct {
+	tree *toml.Tree
+	key  config.KeyFactory
+}
+
+func (p *Provider) IsSupport(ctx context.Context, key config.Key) bool {
+	return p.key(ctx, key) != ""
+}
+
+func (p *Provider) Name() string {
+	return "toml"
+}
+
+func (p *Provider) Read(ctx context.Context, key config.Key) (config.Variable, error) {
+	if k := p.key(ctx, key); p.tree.Has(k) {
+		return config.Variable{
+			Name:     k,
+			Provider: p.Name(),
+			Value:    Value{Value: value.Value{Val: p.tree.Get(k)}},
+		}, nil
+	}
+
+	return config.Variable{}, config.ErrVariableNotFound
+}
--- a/provider/toml/provider_test.go
+++ b/provider/toml/provider_test.go
@ -0,0 +1,29 @@
+package toml_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	"gitoa.ru/go-4devs/config/provider/toml"
+	"gitoa.ru/go-4devs/config/test"
+)
+
+func TestProvider(t *testing.T) {
+	t.Parallel()
+
+	prov, err := toml.NewFile(test.FixturePath("config.toml"))
+	require.NoError(t, err)
+
+	m := []int{}
+
+	read := []test.Read{
+		test.NewRead("database.server", "192.168.1.1"),
+		test.NewRead("title", "TOML Example"),
+		test.NewRead("servers.alpha.ip", "10.0.0.1"),
+		test.NewRead("database.enabled", true),
+		test.NewRead("database.connection_max", 5000),
+		test.NewReadUnmarshal("database.ports", &[]int{8001, 8001, 8002}, &m),
+	}
+
+	test.Run(t, prov, read)
+}
--- a/provider/toml/value.go
+++ b/provider/toml/value.go
@ -0,0 +1,41 @@
+package toml
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"gitoa.ru/go-4devs/config"
+	"gitoa.ru/go-4devs/config/value"
+)
+
+type Value struct {
+	value.Value
+}
+
+func (s Value) Int() int {
+	v, _ := s.ParseInt()
+
+	return v
+}
+
+func (s Value) ParseInt() (int, error) {
+	v, err := s.ParseInt64()
+	if err != nil {
+		return 0, fmt.Errorf("toml failed parce int: %w", err)
+	}
+
+	return int(v), nil
+}
+
+func (s Value) Unmarshal(target interface{}) error {
+	b, err := json.Marshal(s.Raw())
+	if err != nil {
+		return fmt.Errorf("%w: %s", config.ErrInvalidValue, err)
+	}
+
+	if err := json.Unmarshal(b, target); err != nil {
+		return fmt.Errorf("%w: %s", config.ErrInvalidValue, err)
+	}
+
+	return nil
+}
--- a/provider/vault/secret.go
+++ b/provider/vault/secret.go
@ -0,0 +1,90 @@
+package vault
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+
+	"github.com/hashicorp/vault/api"
+	"gitoa.ru/go-4devs/config"
+	"gitoa.ru/go-4devs/config/key"
+	"gitoa.ru/go-4devs/config/value"
+)
+
+var _ config.Provider = (*SecretKV2)(nil)
+
+type SecretOption func(*SecretKV2)
+
+func WithSecretResolve(f func(context.Context, config.Key) (string, string)) SecretOption {
+	return func(s *SecretKV2) { s.resolve = f }
+}
+
+func NewSecretKV2(client *api.Client, opts ...SecretOption) *SecretKV2 {
+	s := SecretKV2{
+		client:  client,
+		resolve: key.LastIndexField(":", "value", key.PrefixName("secret/data/", key.NsAppName("/"))),
+	}
+
+	for _, opt := range opts {
+		opt(&s)
+	}
+
+	return &s
+}
+
+type SecretKV2 struct {
+	client  *api.Client
+	resolve func(ctx context.Context, key config.Key) (string, string)
+}
+
+func (p *SecretKV2) IsSupport(ctx context.Context, key config.Key) bool {
+	path, _ := p.resolve(ctx, key)
+
+	return path != ""
+}
+
+func (p *SecretKV2) Name() string {
+	return "vault"
+}
+
+func (p *SecretKV2) Read(ctx context.Context, key config.Key) (config.Variable, error) {
+	path, field := p.resolve(ctx, key)
+
+	s, err := p.client.Logical().Read(path)
+	if err != nil {
+		return config.Variable{}, fmt.Errorf("%w: path:%s, field:%s, provider:%s", err, path, field, p.Name())
+	}
+
+	if s == nil || len(s.Data) == 0 {
+		return config.Variable{}, fmt.Errorf("%w: path:%s, field:%s, provider:%s", config.ErrVariableNotFound, path, field, p.Name())
+	}
+
+	if len(s.Warnings) > 0 {
+		return config.Variable{},
+			fmt.Errorf("%w: warn: %s, path:%s, field:%s, provider:%s", config.ErrVariableNotFound, s.Warnings, path, field, p.Name())
+	}
+
+	d, ok := s.Data["data"].(map[string]interface{})
+	if !ok {
+		return config.Variable{}, fmt.Errorf("%w: path:%s, field:%s, provider:%s", config.ErrVariableNotFound, path, field, p.Name())
+	}
+
+	if val, ok := d[field]; ok {
+		return config.Variable{
+			Name:     path + field,
+			Provider: p.Name(),
+			Value:    value.JString(fmt.Sprint(val)),
+		}, nil
+	}
+
+	md, err := json.Marshal(d)
+	if err != nil {
+		return config.Variable{}, fmt.Errorf("%w: %s", config.ErrInvalidValue, err)
+	}
+
+	return config.Variable{
+		Name:     path + field,
+		Provider: p.Name(),
+		Value:    value.JBytes(md),
+	}, nil
+}
--- a/provider/vault/secret_test.go
+++ b/provider/vault/secret_test.go
@ -0,0 +1,26 @@
+package vault_test
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+	"gitoa.ru/go-4devs/config/provider/vault"
+	"gitoa.ru/go-4devs/config/test"
+)
+
+func TestProvider(t *testing.T) {
+	t.Parallel()
+
+	cl, err := test.NewVault()
+	require.NoError(t, err)
+
+	provider := vault.NewSecretKV2(cl)
+
+	read := []test.Read{
+		test.NewReadConfig("database"),
+		test.NewRead("db:dsn", test.DSN),
+		test.NewRead("db:timeout", time.Minute),
+	}
+	test.Run(t, provider, read)
+}
--- a/provider/watcher/provider.go
+++ b/provider/watcher/provider.go
@ -0,0 +1,71 @@
+package watcher
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"time"
+
+	"gitoa.ru/go-4devs/config"
+)
+
+var (
+	_ config.Provider      = (*Provider)(nil)
+	_ config.WatchProvider = (*Provider)(nil)
+)
+
+func New(duration time.Duration, provider config.Provider, opts ...Option) *Provider {
+	p := &Provider{
+		Provider: provider,
+		ticker:   time.NewTicker(duration),
+		logger: func(_ context.Context, msg string) {
+			log.Print(msg)
+		},
+	}
+
+	for _, opt := range opts {
+		opt(p)
+	}
+
+	return p
+}
+
+func WithLogger(l func(context.Context, string)) Option {
+	return func(p *Provider) {
+		p.logger = l
+	}
+}
+
+type Option func(*Provider)
+
+type Provider struct {
+	config.Provider
+	ticker *time.Ticker
+	logger func(context.Context, string)
+}
+
+func (p *Provider) Watch(ctx context.Context, key config.Key, callback config.WatchCallback) error {
+	oldVar, err := p.Provider.Read(ctx, key)
+	if err != nil {
+		return fmt.Errorf("%s: failed watch variable: %w", p.Provider.Name(), err)
+	}
+
+	go func() {
+		for {
+			select {
+			case <-p.ticker.C:
+				newVar, err := p.Provider.Read(ctx, key)
+				if err != nil {
+					p.logger(ctx, err.Error())
+				} else if !newVar.IsEquals(oldVar) {
+					callback(ctx, oldVar, newVar)
+					oldVar = newVar
+				}
+			case <-ctx.Done():
+				return
+			}
+		}
+	}()
+
+	return nil
+}
--- a/provider/watcher/provider_test.go
+++ b/provider/watcher/provider_test.go
@ -0,0 +1,58 @@
+package watcher_test
+
+import (
+	"context"
+	"fmt"
+	"sync"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+	"gitoa.ru/go-4devs/config"
+	"gitoa.ru/go-4devs/config/provider/watcher"
+	"gitoa.ru/go-4devs/config/value"
+)
+
+type provider struct {
+	cnt int32
+}
+
+func (p *provider) Name() string {
+	return "test"
+}
+
+func (p *provider) Read(ctx context.Context, k config.Key) (config.Variable, error) {
+	p.cnt++
+
+	return config.Variable{
+		Name:  "tmpname",
+		Value: value.JString(fmt.Sprint(p.cnt)),
+	}, nil
+}
+
+func TestWatcher(t *testing.T) {
+	t.Parallel()
+
+	ctx := context.Background()
+	prov := &provider{}
+
+	w := watcher.New(time.Second, prov)
+	wg := sync.WaitGroup{}
+	wg.Add(2)
+
+	var cnt int32
+
+	err := w.Watch(
+		ctx,
+		config.Key{Name: "tmpname"},
+		func(ctx context.Context, oldVar, newVar config.Variable) {
+			atomic.AddInt32(&cnt, 1)
+			wg.Done()
+		},
+	)
+	require.NoError(t, err)
+	wg.Wait()
+
+	require.Equal(t, int32(2), cnt)
+}
--- a/provider/yaml/file.go
+++ b/provider/yaml/file.go
@ -0,0 +1,57 @@
+package yaml
+
+import (
+	"context"
+	"fmt"
+	"io/ioutil"
+
+	"gitoa.ru/go-4devs/config"
+	"gopkg.in/yaml.v3"
+)
+
+func WithFileKeyFactory(f func(context.Context, config.Key) []string) FileOption {
+	return func(p *File) {
+		p.key = f
+	}
+}
+
+type FileOption func(*File)
+
+func NewFile(name string, opts ...FileOption) *File {
+	f := File{
+		file: name,
+		key:  keyFactory,
+	}
+
+	for _, opt := range opts {
+		opt(&f)
+	}
+
+	return &f
+}
+
+type File struct {
+	file string
+	key  func(context.Context, config.Key) []string
+}
+
+func (p *File) Name() string {
+	return "yaml_file"
+}
+
+func (p *File) Read(ctx context.Context, key config.Key) (config.Variable, error) {
+	in, err := ioutil.ReadFile(p.file)
+	if err != nil {
+		return config.Variable{}, fmt.Errorf("yaml_file: read error: %w", err)
+	}
+
+	var n yaml.Node
+	if err = yaml.Unmarshal(in, &n); err != nil {
+		return config.Variable{}, fmt.Errorf("yaml_file: unmarshal error: %w", err)
+	}
+
+	data := node{Node: &n}
+	k := p.key(ctx, key)
+
+	return data.read(p.Name(), k)
+}
--- a/provider/yaml/provider.go
+++ b/provider/yaml/provider.go
@ -0,0 +1,88 @@
+package yaml
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"strings"
+
+	"gitoa.ru/go-4devs/config"
+	"gitoa.ru/go-4devs/config/value"
+	"gopkg.in/yaml.v3"
+)
+
+var _ config.Provider = (*Provider)(nil)
+
+func keyFactory(ctx context.Context, key config.Key) []string {
+	return strings.Split(key.Name, "/")
+}
+
+func New(yml []byte, opts ...Option) (*Provider, error) {
+	var data yaml.Node
+	if err := yaml.Unmarshal(yml, &data); err != nil {
+		return nil, fmt.Errorf("yaml: unmarshal err: %w", err)
+	}
+
+	p := Provider{
+		key:  keyFactory,
+		data: node{Node: &data},
+	}
+
+	for _, opt := range opts {
+		opt(&p)
+	}
+
+	return &p, nil
+}
+
+type Option func(*Provider)
+
+type Provider struct {
+	data node
+	key  func(context.Context, config.Key) []string
+}
+
+func (p *Provider) Name() string {
+	return "yaml"
+}
+
+func (p *Provider) Read(ctx context.Context, key config.Key) (config.Variable, error) {
+	k := p.key(ctx, key)
+
+	return p.data.read(p.Name(), k)
+}
+
+type node struct {
+	*yaml.Node
+}
+
+func (n *node) read(name string, k []string) (config.Variable, error) {
+	val, err := getData(n.Node.Content[0].Content, k)
+	if err != nil {
+		if errors.Is(err, config.ErrVariableNotFound) {
+			return config.Variable{}, fmt.Errorf("%w: %s", config.ErrVariableNotFound, name)
+		}
+
+		return config.Variable{}, fmt.Errorf("%w: %s", err, name)
+	}
+
+	return config.Variable{
+		Name:     strings.Join(k, "."),
+		Provider: name,
+		Value:    value.Decode(val),
+	}, nil
+}
+
+func getData(node []*yaml.Node, keys []string) (func(interface{}) error, error) {
+	for i := len(node) - 1; i > 0; i -= 2 {
+		if node[i-1].Value == keys[0] {
+			if len(keys) > 1 {
+				return getData(node[i].Content, keys[1:])
+			}
+
+			return node[i].Decode, nil
+		}
+	}
+
+	return nil, config.ErrVariableNotFound
+}
--- a/provider/yaml/provider_test.go
+++ b/provider/yaml/provider_test.go
@ -0,0 +1,26 @@
+package yaml_test
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+	provider "gitoa.ru/go-4devs/config/provider/yaml"
+	"gitoa.ru/go-4devs/config/test"
+)
+
+func TestProvider(t *testing.T) {
+	t.Parallel()
+
+	prov, err := provider.New(test.ReadFile("config.yaml"))
+	require.Nil(t, err)
+
+	read := []test.Read{
+		test.NewRead("duration_var", 21*time.Minute),
+		test.NewRead("app/name/bool_var", true),
+		test.NewRead("time_var", test.Time("2020-01-02T15:04:05Z")),
+		test.NewReadConfig("cfg"),
+	}
+
+	test.Run(t, prov, read)
+}
--- a/test/etcd.go
+++ b/test/etcd.go
@ -0,0 +1,46 @@
+package test
+
+import (
+	"context"
+	"os"
+	"time"
+
+	client "go.etcd.io/etcd/client/v3"
+)
+
+func NewEtcd(ctx context.Context) (*client.Client, error) {
+	dsn, ok := os.LookupEnv("FDEVS_CONFIG_ETCD_HOST")
+	if !ok {
+		dsn = "127.0.0.1:2379"
+	}
+
+	et, err := client.New(client.Config{
+		Endpoints:   []string{dsn},
+		DialTimeout: time.Second,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	values := map[string]string{
+		"fdevs/config/db_dsn":   "pgsql://user@pass:127.0.0.1:5432",
+		"fdevs/config/duration": "12m",
+		"fdevs/config/port":     "8080",
+		"fdevs/config/maintain": "true",
+		"fdevs/config/start_at": "2020-01-02T15:04:05Z",
+		"fdevs/config/percent":  "0.064",
+		"fdevs/config/count":    "2020",
+		"fdevs/config/int64":    "2021",
+		"fdevs/config/uint64":   "2022",
+		"fdevs/config/config":   ConfigJSON,
+	}
+
+	for name, val := range values {
+		_, err = et.KV.Put(ctx, name, val)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return et, nil
+}
--- a/test/fixture/config.ini
+++ b/test/fixture/config.ini
--- a/test/fixture/config.json
+++ b/test/fixture/config.json
@ -0,0 +1,16 @@
+{
+    "app": {
+        "name": {
+            "var": [
+                "name"
+            ],
+            "title": "config title",
+            "timeout": "1m",
+            "success": true
+        }
+    },
+    "cfg": {
+        "duration": 1260000000000,
+        "enabled": true
+    }
+}
--- a/test/fixture/config.toml
+++ b/test/fixture/config.toml
@ -0,0 +1,31 @@
+title = "TOML Example"
+
+[owner]
+name = "Tom Preston-Werner"
+dob = 1979-05-27T07:32:00-08:00 # First class dates
+
+[database]
+server = "192.168.1.1"
+ports = [ 8001, 8001, 8002 ]
+connection_max = 5000
+enabled = true
+
+[servers]
+
+  # Indentation (tabs and/or spaces) is allowed but not required
+  [servers.alpha]
+  ip = "10.0.0.1"
+  dc = "eqdc10"
+
+  [servers.beta]
+  ip = "10.0.0.2"
+  dc = "eqdc10"
+
+[clients]
+data = [ ["gamma", "delta"], [1, 2] ]
+
+# Line breaks are OK when inside arrays
+hosts = [
+  "alpha",
+  "omega"
+]
--- a/test/fixture/config.yaml
+++ b/test/fixture/config.yaml
@ -0,0 +1,12 @@
+app:
+    name:
+        var: 
+            - test
+        bool_var: true
+duration_var: 21m
+empty_var: 
+url_var: "http://google.com/"
+time_var: "2020-01-02T15:04:05Z"
+cfg:
+    duration: 21m
+    enabled: true
--- a/test/helpers.go
+++ b/test/helpers.go
@ -0,0 +1,17 @@
+package test
+
+import (
+	"path/filepath"
+	"runtime"
+)
+
+func FixturePath(file string) string {
+	path := "fixture/"
+
+	_, filename, _, ok := runtime.Caller(0)
+	if ok {
+		path = filepath.Dir(filename) + "/" + path
+	}
+
+	return path + file
+}
--- a/test/ini.go
+++ b/test/ini.go
@ -0,0 +1,16 @@
+package test
+
+import (
+	"log"
+
+	"gopkg.in/ini.v1"
+)
+
+func NewINI() *ini.File {
+	f, err := ini.Load(FixturePath("config.ini"))
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	return f
+}
--- a/test/json.go
+++ b/test/json.go
@ -0,0 +1,15 @@
+package test
+
+import (
+	"io/ioutil"
+	"log"
+)
+
+func ReadFile(file string) []byte {
+	data, err := ioutil.ReadFile(FixturePath(file))
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	return data
+}
--- a/test/provider_suite.go
+++ b/test/provider_suite.go
@ -0,0 +1,150 @@
+package test
+
+import (
+	"context"
+	"io/ioutil"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+	"github.com/stretchr/testify/suite"
+	"gitoa.ru/go-4devs/config"
+)
+
+const (
+	DSN       = "pgsql://user@pass:127.0.0.1:5432"
+	Namespace = "fdevs"
+	AppName   = "config"
+)
+
+func Run(t *testing.T, provider config.Provider, read []Read) {
+	t.Helper()
+
+	prov := &ProviderSuite{
+		provider: provider,
+		read:     read,
+	}
+	suite.Run(t, prov)
+}
+
+type ProviderSuite struct {
+	suite.Suite
+	provider config.Provider
+	read     []Read
+}
+
+type Read struct {
+	Key    config.Key
+	Assert func(t *testing.T, v config.Value)
+}
+
+const ConfigJSON = `{"duration":1260000000000,"enabled":true}`
+
+type Config struct {
+	Duration time.Duration
+	Enabled  bool
+}
+
+func NewReadConfig(key string) Read {
+	ex := &Config{
+		Duration: 21 * time.Minute,
+		Enabled:  true,
+	}
+
+	return NewReadUnmarshal(key, ex, &Config{})
+}
+
+func NewReadUnmarshal(key string, expected, target interface{}) Read {
+	return Read{
+		Key: config.Key{
+			Namespace: "fdevs",
+			AppName:   "config",
+			Name:      key,
+		},
+		Assert: func(t *testing.T, v config.Value) {
+			t.Helper()
+			require.NoErrorf(t, v.Unmarshal(target), "unmarshal")
+			require.Equal(t, expected, target, "unmarshal")
+		},
+	}
+}
+
+func Time(value string) time.Time {
+	t, _ := time.Parse(time.RFC3339, value)
+
+	return t
+}
+
+// nolint: cyclop
+func NewRead(key string, expected interface{}) Read {
+	return Read{
+		Key: config.Key{
+			Namespace: "fdevs",
+			AppName:   "config",
+			Name:      key,
+		},
+		Assert: func(t *testing.T, v config.Value) {
+			t.Helper()
+			var (
+				val   interface{}
+				err   error
+				short interface{}
+			)
+			switch expected.(type) {
+			case bool:
+				val, err = v.ParseBool()
+				short = v.Bool()
+			case int:
+				val, err = v.ParseInt()
+				short = v.Int()
+			case int64:
+				val, err = v.ParseInt64()
+				short = v.Int64()
+			case uint:
+				val, err = v.ParseUint()
+				short = v.Uint()
+			case uint64:
+				val, err = v.ParseUint64()
+				short = v.Uint64()
+			case string:
+				val, err = v.ParseString()
+				short = v.String()
+			case float64:
+				val, err = v.ParseFloat64()
+				short = v.Float64()
+			case time.Duration:
+				val, err = v.ParseDuration()
+				short = v.Duration()
+			case time.Time:
+				val, err = v.ParseTime()
+				short = v.Time()
+			default:
+				require.Fail(t, "unexpected type", "type:%+T", expected)
+			}
+
+			require.Equalf(t, val, short, "type:%T", expected)
+			require.NoErrorf(t, err, "type:%T", expected)
+			require.Equalf(t, expected, val, "type:%T", expected)
+		},
+	}
+}
+
+func (ps *ProviderSuite) TestReadKeys() {
+	ctx := context.Background()
+
+	for _, read := range ps.read {
+		val, err := ps.provider.Read(ctx, read.Key)
+		require.NoError(ps.T(), err, read.Key.String())
+		read.Assert(ps.T(), val.Value)
+	}
+}
+
+func LoadConfig(t *testing.T, path string) []byte {
+	t.Helper()
+
+	file, err := ioutil.ReadFile(filepath.Clean(path))
+	require.NoError(t, err)
+
+	return file
+}
--- a/test/vault.go
+++ b/test/vault.go
@ -0,0 +1,89 @@
+package test
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"net/http"
+	"os"
+
+	"github.com/hashicorp/vault/api"
+)
+
+const token = "dev"
+
+func NewVault() (*api.Client, error) {
+	address, ok := os.LookupEnv("VAULT_DEV_LISTEN_ADDRESS")
+	if !ok {
+		address = "http://127.0.0.1:8200"
+	}
+
+	tokenID, ok := os.LookupEnv("VAULT_DEV_ROOT_TOKEN_ID")
+	if !ok {
+		tokenID = token
+	}
+
+	cl, err := api.NewClient(&api.Config{
+		Address: address,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	cl.SetToken(tokenID)
+
+	values := map[string]map[string]interface{}{
+		"database": {
+			"duration": 1260000000000,
+			"enabled":  true,
+		},
+		"db": {
+			"dsn":     DSN,
+			"timeout": "60s",
+		},
+		"example": {
+			"dsn":     DSN,
+			"timeout": "60s",
+		},
+	}
+
+	for name, val := range values {
+		if err := create(address, tokenID, name, val); err != nil {
+			return nil, err
+		}
+	}
+
+	return cl, nil
+}
+
+func create(host, token, path string, data map[string]interface{}) error {
+	type Req struct {
+		Data interface{} `json:"data"`
+	}
+
+	b, err := json.Marshal(Req{Data: data})
+	if err != nil {
+		return err
+	}
+
+	body := bytes.NewBuffer(b)
+
+	req, err := http.NewRequestWithContext(
+		context.Background(),
+		http.MethodPost,
+		host+"/v1/secret/data/fdevs/config/"+path,
+		body,
+	)
+	if err != nil {
+		return err
+	}
+
+	req.Header.Set("X-Vault-Token", token)
+
+	res, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return err
+	}
+
+	return res.Body.Close()
+}
--- a/value.go
+++ b/value.go
@ -0,0 +1,39 @@
+package config
+
+import (
+	"time"
+)
+
+type Value interface {
+	ReadValue
+	ParseValue
+	UnmarshalValue
+}
+
+type UnmarshalValue interface {
+	Unmarshal(val interface{}) error
+}
+
+type ReadValue interface {
+	String() string
+	Int() int
+	Int64() int64
+	Uint() uint
+	Uint64() uint64
+	Float64() float64
+	Bool() bool
+	Duration() time.Duration
+	Time() time.Time
+}
+
+type ParseValue interface {
+	ParseString() (string, error)
+	ParseInt() (int, error)
+	ParseInt64() (int64, error)
+	ParseUint() (uint, error)
+	ParseUint64() (uint64, error)
+	ParseFloat64() (float64, error)
+	ParseBool() (bool, error)
+	ParseDuration() (time.Duration, error)
+	ParseTime() (time.Time, error)
+}
--- a/value/decode.go
+++ b/value/decode.go
@ -0,0 +1,109 @@
+package value
+
+import (
+	"time"
+
+	"gitoa.ru/go-4devs/config"
+)
+
+var _ config.Value = (*Decode)(nil)
+
+type Decode func(v interface{}) error
+
+func (s Decode) Unmarshal(v interface{}) error {
+	return s(v)
+}
+
+func (s Decode) ParseInt() (v int, err error) {
+	return v, s.Unmarshal(&v)
+}
+
+func (s Decode) ParseInt64() (v int64, err error) {
+	return v, s.Unmarshal(&v)
+}
+
+func (s Decode) ParseUint() (v uint, err error) {
+	return v, s.Unmarshal(&v)
+}
+
+func (s Decode) ParseUint64() (v uint64, err error) {
+	return v, s.Unmarshal(&v)
+}
+
+func (s Decode) ParseFloat64() (v float64, err error) {
+	return v, s.Unmarshal(&v)
+}
+
+func (s Decode) ParseString() (v string, err error) {
+	return v, s.Unmarshal(&v)
+}
+
+func (s Decode) ParseDuration() (v time.Duration, err error) {
+	return v, s.Unmarshal(&v)
+}
+
+func (s Decode) ParseTime() (v time.Time, err error) {
+	return v, s.Unmarshal(&v)
+}
+
+func (s Decode) Int() int {
+	in, _ := s.ParseInt()
+
+	return in
+}
+
+func (s Decode) Int64() int64 {
+	in, _ := s.ParseInt64()
+
+	return in
+}
+
+func (s Decode) Uint() uint {
+	in, _ := s.ParseUint()
+
+	return in
+}
+
+func (s Decode) Uint64() uint64 {
+	in, _ := s.ParseUint64()
+
+	return in
+}
+
+func (s Decode) Float64() float64 {
+	in, _ := s.ParseFloat64()
+
+	return in
+}
+
+func (s Decode) Bytes() []byte {
+	return []byte(s.String())
+}
+
+func (s Decode) String() string {
+	v, _ := s.ParseString()
+
+	return v
+}
+
+func (s Decode) Bool() bool {
+	in, _ := s.ParseBool()
+
+	return in
+}
+
+func (s Decode) ParseBool() (v bool, err error) {
+	return v, s.Unmarshal(&v)
+}
+
+func (s Decode) Duration() time.Duration {
+	in, _ := s.ParseDuration()
+
+	return in
+}
+
+func (s Decode) Time() time.Time {
+	in, _ := s.ParseTime()
+
+	return in
+}
--- a/value/empty.go
+++ b/value/empty.go
@ -0,0 +1,85 @@
+package value
+
+import (
+	"time"
+)
+
+type Empty struct {
+	Err error
+}
+
+func (e Empty) Unmarshal(val interface{}) error {
+	return e.Err
+}
+
+func (e Empty) ParseString() (string, error) {
+	return "", e.Err
+}
+
+func (e Empty) ParseInt() (int, error) {
+	return 0, e.Err
+}
+
+func (e Empty) ParseInt64() (int64, error) {
+	return 0, e.Err
+}
+
+func (e Empty) ParseUint() (uint, error) {
+	return 0, e.Err
+}
+
+func (e Empty) ParseUint64() (uint64, error) {
+	return 0, e.Err
+}
+
+func (e Empty) ParseFloat64() (float64, error) {
+	return 0, e.Err
+}
+
+func (e Empty) ParseBool() (bool, error) {
+	return false, e.Err
+}
+
+func (e Empty) ParseDuration() (time.Duration, error) {
+	return 0, e.Err
+}
+
+func (e Empty) ParseTime() (time.Time, error) {
+	return time.Time{}, e.Err
+}
+
+func (e Empty) String() string {
+	return ""
+}
+
+func (e Empty) Int() int {
+	return 0
+}
+
+func (e Empty) Int64() int64 {
+	return 0
+}
+
+func (e Empty) Uint() uint {
+	return 0
+}
+
+func (e Empty) Uint64() uint64 {
+	return 0
+}
+
+func (e Empty) Float64() float64 {
+	return 0
+}
+
+func (e Empty) Bool() bool {
+	return false
+}
+
+func (e Empty) Duration() time.Duration {
+	return 0
+}
+
+func (e Empty) Time() time.Time {
+	return time.Time{}
+}
--- a/value/helpers.go
+++ b/value/helpers.go
@ -0,0 +1,81 @@
+package value
+
+import (
+	"encoding/json"
+	"fmt"
+	"strconv"
+	"time"
+
+	"gitoa.ru/go-4devs/config"
+)
+
+func ParseDuration(raw string) (time.Duration, error) {
+	d, err := time.ParseDuration(raw)
+	if err != nil {
+		return 0, fmt.Errorf("%w: %s", config.ErrInvalidValue, err)
+	}
+
+	return d, nil
+}
+
+func ParseInt(s string) (int64, error) {
+	i, err := strconv.ParseInt(s, 10, 64)
+	if err != nil {
+		return 0, fmt.Errorf("%w: %s", config.ErrInvalidValue, err)
+	}
+
+	return i, nil
+}
+
+func ParseUint(s string) (uint64, error) {
+	i, err := strconv.ParseUint(s, 10, 64)
+	if err != nil {
+		return 0, fmt.Errorf("%w: %s", config.ErrInvalidValue, err)
+	}
+
+	return i, nil
+}
+
+func Atoi(s string) (int, error) {
+	i, err := strconv.Atoi(s)
+	if err != nil {
+		return 0, fmt.Errorf("%w: %s", config.ErrInvalidValue, err)
+	}
+
+	return i, nil
+}
+
+func ParseTime(s string) (time.Time, error) {
+	i, err := time.Parse(time.RFC3339, s)
+	if err != nil {
+		return time.Time{}, fmt.Errorf("%w: %s", config.ErrInvalidValue, err)
+	}
+
+	return i, nil
+}
+
+func ParseFloat(s string) (float64, error) {
+	f, err := strconv.ParseFloat(s, 64)
+	if err != nil {
+		return 0, fmt.Errorf("%w: %s", config.ErrInvalidValue, err)
+	}
+
+	return f, nil
+}
+
+func ParseBool(s string) (bool, error) {
+	b, err := strconv.ParseBool(s)
+	if err != nil {
+		return false, fmt.Errorf("%w: %s", config.ErrInvalidValue, err)
+	}
+
+	return b, nil
+}
+
+func JUnmarshal(b []byte, v interface{}) error {
+	if err := json.Unmarshal(b, v); err != nil {
+		return fmt.Errorf("%w: %s", config.ErrInvalidValue, err)
+	}
+
+	return nil
+}
--- a/value/jbytes.go
+++ b/value/jbytes.go
@ -0,0 +1,112 @@
+package value
+
+import (
+	"time"
+
+	"gitoa.ru/go-4devs/config"
+)
+
+var _ config.Value = (*JBytes)(nil)
+
+type JBytes []byte
+
+func (s JBytes) Unmarshal(v interface{}) error {
+	return JUnmarshal(s.Bytes(), v)
+}
+
+func (s JBytes) ParseString() (string, error) {
+	return s.String(), nil
+}
+
+func (s JBytes) ParseInt() (int, error) {
+	return Atoi(s.String())
+}
+
+func (s JBytes) ParseInt64() (int64, error) {
+	return ParseInt(s.String())
+}
+
+func (s JBytes) ParseUint() (uint, error) {
+	u64, err := ParseUint(s.String())
+	if err != nil {
+		return 0, err
+	}
+
+	return uint(u64), nil
+}
+
+func (s JBytes) ParseUint64() (uint64, error) {
+	return ParseUint(s.String())
+}
+
+func (s JBytes) ParseFloat64() (float64, error) {
+	return ParseFloat(s.String())
+}
+
+func (s JBytes) ParseBool() (bool, error) {
+	return ParseBool(s.String())
+}
+
+func (s JBytes) ParseDuration() (time.Duration, error) {
+	return ParseDuration(s.String())
+}
+
+func (s JBytes) ParseTime() (time.Time, error) {
+	return ParseTime(s.String())
+}
+
+func (s JBytes) Bytes() []byte {
+	return []byte(s)
+}
+
+func (s JBytes) String() string {
+	return string(s)
+}
+
+func (s JBytes) Int() int {
+	in, _ := s.ParseInt()
+
+	return in
+}
+
+func (s JBytes) Int64() int64 {
+	in, _ := s.ParseInt64()
+
+	return in
+}
+
+func (s JBytes) Uint() uint {
+	in, _ := s.ParseUint()
+
+	return in
+}
+
+func (s JBytes) Uint64() uint64 {
+	in, _ := s.ParseUint64()
+
+	return in
+}
+
+func (s JBytes) Float64() float64 {
+	in, _ := s.ParseFloat64()
+
+	return in
+}
+
+func (s JBytes) Bool() bool {
+	in, _ := s.ParseBool()
+
+	return in
+}
+
+func (s JBytes) Duration() time.Duration {
+	in, _ := s.ParseDuration()
+
+	return in
+}
+
+func (s JBytes) Time() time.Time {
+	in, _ := s.ParseTime()
+
+	return in
+}
--- a/value/jstring.go
+++ b/value/jstring.go
@ -0,0 +1,112 @@
+package value
+
+import (
+	"time"
+
+	"gitoa.ru/go-4devs/config"
+)
+
+var _ config.Value = (*JString)(nil)
+
+type JString string
+
+func (s JString) Unmarshal(v interface{}) error {
+	return JUnmarshal(s.Bytes(), v)
+}
+
+func (s JString) ParseString() (string, error) {
+	return s.String(), nil
+}
+
+func (s JString) ParseInt() (int, error) {
+	return Atoi(s.String())
+}
+
+func (s JString) ParseInt64() (int64, error) {
+	return ParseInt(s.String())
+}
+
+func (s JString) ParseUint() (uint, error) {
+	u64, err := ParseUint(s.String())
+	if err != nil {
+		return 0, err
+	}
+
+	return uint(u64), nil
+}
+
+func (s JString) ParseUint64() (uint64, error) {
+	return ParseUint(s.String())
+}
+
+func (s JString) ParseFloat64() (float64, error) {
+	return ParseFloat(s.String())
+}
+
+func (s JString) ParseBool() (bool, error) {
+	return ParseBool(s.String())
+}
+
+func (s JString) ParseDuration() (time.Duration, error) {
+	return ParseDuration(s.String())
+}
+
+func (s JString) ParseTime() (time.Time, error) {
+	return ParseTime(s.String())
+}
+
+func (s JString) Bytes() []byte {
+	return []byte(s)
+}
+
+func (s JString) String() string {
+	return string(s)
+}
+
+func (s JString) Int() int {
+	in, _ := s.ParseInt()
+
+	return in
+}
+
+func (s JString) Int64() int64 {
+	in, _ := s.ParseInt64()
+
+	return in
+}
+
+func (s JString) Uint() uint {
+	in, _ := s.ParseUint()
+
+	return in
+}
+
+func (s JString) Uint64() uint64 {
+	in, _ := s.ParseUint64()
+
+	return in
+}
+
+func (s JString) Float64() float64 {
+	in, _ := s.ParseFloat64()
+
+	return in
+}
+
+func (s JString) Bool() bool {
+	in, _ := s.ParseBool()
+
+	return in
+}
+
+func (s JString) Duration() time.Duration {
+	in, _ := s.ParseDuration()
+
+	return in
+}
+
+func (s JString) Time() time.Time {
+	in, _ := s.ParseTime()
+
+	return in
+}
--- a/value/jstring_test.go
+++ b/value/jstring_test.go
@ -0,0 +1,37 @@
+package value_test
+
+import (
+	"errors"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+	"gitoa.ru/go-4devs/config"
+	"gitoa.ru/go-4devs/config/value"
+)
+
+func TestStringDuration(t *testing.T) {
+	t.Parallel()
+
+	tests := map[string]struct {
+		raw value.JString
+		exp time.Duration
+		err error
+	}{
+		"1m": {
+			raw: value.JString("1m"),
+			exp: time.Minute,
+		},
+		"number error": {
+			raw: value.JString("100000000"),
+			err: config.ErrInvalidValue,
+		},
+	}
+
+	for name, data := range tests {
+		require.Equal(t, data.exp, data.raw.Duration(), name)
+		d, err := data.raw.ParseDuration()
+		require.Truef(t, errors.Is(err, data.err), "%[1]s: expect:%#[2]v, got:%#[3]v", name, data.err, err)
+		require.Equal(t, data.exp, d, name)
+	}
+}
--- a/value/value.go
+++ b/value/value.go
@ -0,0 +1,158 @@
+package value
+
+import (
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"gitoa.ru/go-4devs/config"
+)
+
+var _ config.Value = (*Value)(nil)
+
+type Value struct {
+	Val interface{}
+}
+
+func (s Value) Int() int {
+	v, _ := s.ParseInt()
+
+	return v
+}
+
+func (s Value) Int64() int64 {
+	v, _ := s.ParseInt64()
+
+	return v
+}
+
+func (s Value) Uint() uint {
+	v, _ := s.ParseUint()
+
+	return v
+}
+
+func (s Value) Uint64() uint64 {
+	v, _ := s.ParseUint64()
+
+	return v
+}
+
+func (s Value) Float64() float64 {
+	in, _ := s.ParseFloat64()
+
+	return in
+}
+
+func (s Value) String() string {
+	v, _ := s.ParseString()
+
+	return v
+}
+
+func (s Value) Bool() bool {
+	v, _ := s.ParseBool()
+
+	return v
+}
+
+func (s Value) Duration() time.Duration {
+	v, _ := s.ParseDuration()
+
+	return v
+}
+
+func (s Value) Raw() interface{} {
+	return s.Val
+}
+
+func (s Value) Time() time.Time {
+	v, _ := s.ParseTime()
+
+	return v
+}
+
+func (s Value) Unmarshal(target interface{}) error {
+	if v, ok := s.Raw().([]byte); ok {
+		err := json.Unmarshal(v, target)
+		if err != nil {
+			return fmt.Errorf("%w: %s", config.ErrInvalidValue, err)
+		}
+
+		return nil
+	}
+
+	return config.ErrInvalidValue
+}
+
+func (s Value) ParseInt() (int, error) {
+	if r, ok := s.Raw().(int); ok {
+		return r, nil
+	}
+
+	return 0, config.ErrInvalidValue
+}
+
+func (s Value) ParseInt64() (int64, error) {
+	if r, ok := s.Raw().(int64); ok {
+		return r, nil
+	}
+
+	return 0, config.ErrInvalidValue
+}
+
+func (s Value) ParseUint() (uint, error) {
+	if r, ok := s.Raw().(uint); ok {
+		return r, nil
+	}
+
+	return 0, config.ErrInvalidValue
+}
+
+func (s Value) ParseUint64() (uint64, error) {
+	if r, ok := s.Raw().(uint64); ok {
+		return r, nil
+	}
+
+	return 0, config.ErrInvalidValue
+}
+
+func (s Value) ParseFloat64() (float64, error) {
+	if r, ok := s.Raw().(float64); ok {
+		return r, nil
+	}
+
+	return 0, config.ErrInvalidValue
+}
+
+func (s Value) ParseString() (string, error) {
+	if r, ok := s.Raw().(string); ok {
+		return r, nil
+	}
+
+	return "", config.ErrInvalidValue
+}
+
+func (s Value) ParseBool() (bool, error) {
+	if b, ok := s.Raw().(bool); ok {
+		return b, nil
+	}
+
+	return false, config.ErrInvalidValue
+}
+
+func (s Value) ParseDuration() (time.Duration, error) {
+	if b, ok := s.Raw().(time.Duration); ok {
+		return b, nil
+	}
+
+	return 0, config.ErrInvalidValue
+}
+
+func (s Value) ParseTime() (time.Time, error) {
+	if b, ok := s.Raw().(time.Time); ok {
+		return b, nil
+	}
+
+	return time.Time{}, config.ErrInvalidValue
+}
--- a/variable.go
+++ b/variable.go
@ -0,0 +1,11 @@
+package config
+
+type Variable struct {
+	Name     string
+	Provider string
+	Value    Value
+}
+
+func (v Variable) IsEquals(n Variable) bool {
+	return n.Name == v.Name && n.Provider == v.Provider && n.Value.String() == v.Value.String()
+}