update golangci

.drone.yml

@@ -1,6 +1,17 @@
 kind: pipeline
 name: default
 
+services:
+  - name: vault
+    image: vault:1.7.1
+    environment:
+      VAULT_DEV_ROOT_TOKEN_ID: dev
+      VAULT_DEV_LISTEN_ADDRESS: 0.0.0.0:8200
+  - name: etcd
+    image: bitnami/etcd:3
+    environment:
+      ALLOW_NONE_AUTHENTICATION: yes
+
 environment:
   VAULT_DEV_LISTEN_ADDRESS: http://vault:8200
   VAULT_DEV_ROOT_TOKEN_ID: dev
@@ -10,11 +21,9 @@ steps:
 - name: test 
   image: golang
   commands:
-  # - go test -parallel 10 -race ./... 
+  - go test -parallel 10 -race ./... 
-  # - go test -race ./... 
-  - go test ./... 
 
 - name: golangci-lint
-  image: golangci/golangci-lint:v1.55
+  image: golangci/golangci-lint:v1.53
   commands:
   - golangci-lint run

.golangci.yml

@@ -34,7 +34,6 @@ linters:
       - scopelint
       - exhaustruct
       - depguard
-      - nolintlint
       #deprecated
       - structcheck
       - varcheck
@@ -43,8 +42,6 @@ linters:
       - ifshort
       - nosnakecase
 
-      - ireturn # implement provider interface
-
 issues:
   # Excluding configuration per-path, per-linter, per-text and per-source
   exclude-rules:

client.go

@@ -8,8 +8,8 @@ import (
 	"sync/atomic"
 )
 
-func Must(providers ...interface{}) *Client {
+func Must(namespace, appName string, providers ...interface{}) *Client {
-	client, err := New(providers...)
+	client, err := New(namespace, appName, providers...)
 	if err != nil {
 		panic(err)
 	}
@@ -17,8 +17,10 @@ func Must(providers ...interface{}) *Client {
 	return client
 }
 
-func New(providers ...interface{}) (*Client, error) {
+func New(namespace, appName string, providers ...interface{}) (*Client, error) {
 	client := &Client{
+		namespace: namespace,
+		appName:   appName,
 		providers: make([]Provider, len(providers)),
 	}
 
@@ -64,7 +66,7 @@ func (p *provider) init(ctx context.Context) error {
 	return nil
 }
 
-func (p *provider) Watch(ctx context.Context, callback WatchCallback, path ...string) error {
+func (p *provider) Watch(ctx context.Context, key Key, callback WatchCallback) error {
 	if err := p.init(ctx); err != nil {
 		return fmt.Errorf("init read:%w", err)
 	}
@@ -74,21 +76,21 @@ func (p *provider) Watch(ctx context.Context, callback WatchCallback, path ...st
 		return nil
 	}
 
-	if err := watch.Watch(ctx, callback, path...); err != nil {
+	if err := watch.Watch(ctx, key, callback); err != nil {
 		return fmt.Errorf("factory provider: %w", err)
 	}
 
 	return nil
 }
 
-func (p *provider) Value(ctx context.Context, path ...string) (Value, error) {
+func (p *provider) Read(ctx context.Context, key Key) (Variable, error) {
 	if err := p.init(ctx); err != nil {
-		return nil, fmt.Errorf("init read:%w", err)
+		return Variable{}, fmt.Errorf("init read:%w", err)
 	}
 
-	variable, err := p.provider.Value(ctx, path...)
+	variable, err := p.provider.Read(ctx, key)
 	if err != nil {
-		return nil, fmt.Errorf("factory provider: %w", err)
+		return Variable{}, fmt.Errorf("factory provider: %w", err)
 	}
 
 	return variable, nil
@@ -96,43 +98,63 @@ func (p *provider) Value(ctx context.Context, path ...string) (Value, error) {
 
 type Client struct {
 	providers []Provider
+	appName   string
+	namespace string
 }
 
-func (c *Client) Name() string {
+func (c *Client) key(name string) Key {
-	return "client"
+	return Key{
+		Name:      name,
+		AppName:   c.appName,
+		Namespace: c.namespace,
+	}
 }
 
 // Value get value by name.
-func (c *Client) Value(ctx context.Context, path ...string) (Value, error) {
+// nolint: ireturn
+func (c *Client) Value(ctx context.Context, name string) (Value, error) {
+	variable, err := c.Variable(ctx, name)
+	if err != nil {
+		return nil, fmt.Errorf("variable:%w", err)
+	}
+
+	return variable.Value, nil
+}
+
+func (c *Client) Variable(ctx context.Context, name string) (Variable, error) {
 	var (
-		value Value
+		variable Variable
-		err   error
+		err      error
 	)
 
+	key := c.key(name)
+
 	for _, provider := range c.providers {
-		value, err = provider.Value(ctx, path...)
+		variable, err = provider.Read(ctx, key)
-		if err == nil || !(errors.Is(err, ErrValueNotFound) || errors.Is(err, ErrInitFactory)) {
+		if err == nil || !(errors.Is(err, ErrVariableNotFound) || errors.Is(err, ErrInitFactory)) {
 			break
 		}
 	}
 
 	if err != nil {
-		return value, fmt.Errorf("client failed get value: %w", err)
+		return variable, fmt.Errorf("client failed get variable: %w", err)
 	}
 
-	return value, nil
+	return variable, nil
 }
 
-func (c *Client) Watch(ctx context.Context, callback WatchCallback, path ...string) error {
+func (c *Client) Watch(ctx context.Context, name string, callback WatchCallback) error {
+	key := c.key(name)
+
 	for idx, prov := range c.providers {
 		provider, ok := prov.(WatchProvider)
 		if !ok {
 			continue
 		}
 
-		err := provider.Watch(ctx, callback, path...)
+		err := provider.Watch(ctx, key, callback)
 		if err != nil {
-			if errors.Is(err, ErrValueNotFound) || errors.Is(err, ErrInitFactory) {
+			if errors.Is(err, ErrVariableNotFound) || errors.Is(err, ErrInitFactory) {
 				continue
 			}
 

client_example_test.go

@@ -0,0 +1,294 @@
+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 ExampleClient_Value() {
+	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")
+
+	config, err := config.New(test.Namespace, test.AppName,
+		arg.New(),
+		env.New(),
+		etcd.NewProvider(etcdClient),
+		vault.NewSecretKV2(vaultClient),
+		json.New(jsonConfig),
+	)
+	if err != nil {
+		log.Print(err)
+
+		return
+	}
+
+	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 ExampleClient_Watch() {
+	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
+		}
+	}()
+
+	watcher, err := config.New(test.Namespace, test.AppName,
+		watcher.New(time.Microsecond, env.New()),
+		watcher.New(time.Microsecond, yaml.NewWatch("test/fixture/config.yaml")),
+		etcd.NewProvider(etcdClient),
+	)
+	if err != nil {
+		log.Print(err)
+
+		return
+	}
+
+	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
+}
+
+func ExampleClient_Value_factory() {
+	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", "--config-json=config.json", "--config-yaml=test/fixture/config.yaml"}
+
+	config, err := config.New(test.Namespace, test.AppName,
+		arg.New(),
+		env.New(),
+		config.Factory(func(ctx context.Context, cfg config.ReadConfig) (config.Provider, error) {
+			val, err := cfg.Value(ctx, "config-json")
+			if err != nil {
+				return nil, fmt.Errorf("failed read config file:%w", err)
+			}
+			jsonConfig := test.ReadFile(val.String())
+
+			return json.New(jsonConfig), nil
+		}),
+		config.Factory(func(ctx context.Context, cfg config.ReadConfig) (config.Provider, error) {
+			val, err := cfg.Value(ctx, "config-yaml")
+			if err != nil {
+				return nil, fmt.Errorf("failed read config file:%w", err)
+			}
+
+			provader, err := yaml.NewFile(val.String())
+			if err != nil {
+				return nil, fmt.Errorf("failed init by file %v:%w", val.String(), err)
+			}
+
+			return provader, nil
+		}),
+	)
+	if err != nil {
+		log.Print(err)
+
+		return
+	}
+
+	port, err := config.Value(ctx, "listen")
+	if err != nil {
+		log.Print(err)
+
+		return
+	}
+
+	title, err := config.Value(ctx, "app.name.title")
+	if err != nil {
+		log.Print(err)
+
+		return
+	}
+
+	yamlTitle, err := config.Value(ctx, "app/title")
+	if err != nil {
+		log.Print(err)
+
+		return
+	}
+
+	cfgValue, err := config.Value(ctx, "cfg")
+	if err != nil {
+		log.Print(err)
+
+		return
+	}
+
+	cfg := test.Config{}
+	_ = cfgValue.Unmarshal(&cfg)
+
+	fmt.Printf("listen from env: %d\n", port.Int())
+	fmt.Printf("title from json: %v\n", title.String())
+	fmt.Printf("yaml title: %v\n", yamlTitle.String())
+	fmt.Printf("struct from json: %+v\n", cfg)
+	// Output:
+	// listen from env: 8080
+	// title from json: config title
+	// yaml title: yaml title
+	// struct from json: {Duration:21m0s Enabled:true}
+}

docker-compose.yml

@@ -2,7 +2,7 @@ version: '3'
 
 services:
   vault:
-    image: vault:1.13.3
+    image: vault:latest
     cap_add:
       - IPC_LOCK
     ports:
@@ -10,7 +10,7 @@ services:
     environment: 
       VAULT_DEV_ROOT_TOKEN_ID: "dev"
   etcd:
-    image: bitnami/etcd:3.5.11
+    image: bitnami/etcd
     environment: 
       ALLOW_NONE_AUTHENTICATION: "yes"
     ports: 

error.go

@@ -3,9 +3,8 @@ package config
 import "errors"
 
 var (
-	ErrValueNotFound = errors.New("value not found")
+	ErrVariableNotFound = errors.New("variable not found")
-	ErrInvalidValue  = errors.New("invalid value")
+	ErrInvalidValue     = errors.New("invalid value")
-	ErrUnknowType    = errors.New("unknow type")
+	ErrUnknowType       = errors.New("unknow type")
-	ErrInitFactory   = errors.New("init factory")
+	ErrInitFactory      = errors.New("init factory")
-	ErrStopWatch     = errors.New("stop watch")
 )

go.mod

@@ -1,3 +1,15 @@
 module gitoa.ru/go-4devs/config
 
-go 1.21
+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
+)

go.sum

@@ -0,0 +1,317 @@
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+google.golang.org/grpc v1.32.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
+gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
+gopkg.in/ini.v1 v1.62.0 h1:duBzk771uxoUuOlyRLkHsygud9+5lrlGjdFBb4mSKDU=
+gopkg.in/ini.v1 v1.62.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/square/go-jose.v2 v2.5.1 h1:7odma5RETjNHWJnR32wx8t+Io4djHE1PqxCFx3iiZ2w=
+gopkg.in/square/go-jose.v2 v2.5.1/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+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=

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
+}

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) {
+		name := factory(ctx, key)
+
+		idx := strings.LastIndex(name, sep)
+		if idx == -1 {
+			return name, ""
+		}
+
+		return name[0:idx], name[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
+	}
+}

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)
+	}
+}

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)
+	}
+}

provider.go

@@ -3,18 +3,17 @@ package config
 import "context"
 
 type Provider interface {
-	Value(ctx context.Context, path ...string) (Value, error)
+	Read(ctx context.Context, key Key) (Variable, error)
 }
 
-type NamedProvider interface {
+type WatchCallback func(ctx context.Context, oldVar, newVar Variable)
-	Name() string
-	Provider
-}
-
-type WatchCallback func(ctx context.Context, oldVar, newVar Value) error
 
 type WatchProvider interface {
-	Watch(ctx context.Context, callback WatchCallback, path ...string) error
+	Watch(ctx context.Context, key Key, callback WatchCallback) error
 }
 
-type Factory func(ctx context.Context, cfg Provider) (Provider, error)
+type ReadConfig interface {
+	Value(ctx context.Context, name string) (Value, error)
+}
+
+type Factory func(ctx context.Context, cfg ReadConfig) (Provider, error)

provider/arg/provider.go

@@ -2,32 +2,28 @@ package arg
 
 import (
 	"context"
-	"encoding/json"
 	"fmt"
 	"os"
 	"strings"
 
 	"gitoa.ru/go-4devs/config"
+	"gitoa.ru/go-4devs/config/key"
 	"gitoa.ru/go-4devs/config/value"
+	"gopkg.in/yaml.v3"
 )
 
-const Name = "arg"
-
 var _ config.Provider = (*Provider)(nil)
 
 type Option func(*Provider)
 
-func WithKeyFactory(factory func(s ...string) string) Option {
+func WithKeyFactory(factory config.KeyFactory) Option {
 	return func(p *Provider) { p.key = factory }
 }
 
 func New(opts ...Option) *Provider {
 	prov := Provider{
-		key: func(s ...string) string {
+		key:  key.Name,
-			return strings.Join(s, "-")
-		},
 		args: make(map[string][]string, len(os.Args[1:])),
-		name: Name,
 	}
 
 	for _, opt := range opts {
@@ -39,8 +35,7 @@ func New(opts ...Option) *Provider {
 
 type Provider struct {
 	args map[string][]string
-	key  func(...string) string
+	key  config.KeyFactory
-	name string
 }
 
 // nolint: cyclop
@@ -103,34 +98,45 @@ func (p *Provider) parse() error {
 }
 
 func (p *Provider) Name() string {
-	return p.name
+	return "arg"
 }
 
-func (p *Provider) Value(_ context.Context, path ...string) (config.Value, error) {
+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 nil, err
+		return config.Variable{
+			Name:     "",
+			Value:    nil,
+			Provider: p.Name(),
+		}, err
 	}
 
-	name := p.key(path...)
+	name := p.key(ctx, key)
 	if val, ok := p.args[name]; ok {
 		switch {
 		case len(val) == 1:
-			return value.JString(val[0]), nil
+			return config.Variable{
+				Name:     name,
+				Provider: p.Name(),
+				Value:    value.JString(val[0]),
+			}, nil
 		default:
-			data, jerr := json.Marshal(val)
+			var yNode yaml.Node
-			if jerr != nil {
+
-				return nil, fmt.Errorf("failed load data:%w", jerr)
+			if err := yaml.Unmarshal([]byte("["+strings.Join(val, ",")+"]"), &yNode); err != nil {
+				return config.Variable{}, fmt.Errorf("arg: failed unmarshal yaml:%w", err)
 			}
 
-			return value.Decode(func(v interface{}) error {
+			return config.Variable{
-				if err := json.Unmarshal(data, v); err != nil {
+				Name:     name,
-					return fmt.Errorf("unmarshal:%w", err)
+				Provider: p.Name(),
-				}
+				Value:    value.Decode(yNode.Decode),
-
+			}, nil
-				return nil
-			}), nil
 		}
 	}
 
-	return nil, fmt.Errorf("%s:%w", p.Name(), config.ErrValueNotFound)
+	return config.Variable{}, fmt.Errorf("%w: %s", config.ErrVariableNotFound, name)
 }

provider/arg/provider_test.go

@@ -1,9 +1,7 @@
 package arg_test
 
 import (
-	"fmt"
 	"os"
-	"strings"
 	"testing"
 	"time"
 
@@ -33,37 +31,18 @@ func TestProvider(t *testing.T) {
 		"--end-after=2008-01-02T15:04:05+03:00",
 	}
 	read := []test.Read{
-		test.NewRead(8080, "listen"),
+		test.NewRead("listen", 8080),
-		test.NewRead("config.hcl", "config"),
+		test.NewRead("config", "config.hcl"),
-		test.NewRead(test.Time("2010-01-02T15:04:05Z"), "start-at"),
+		test.NewRead("start-at", test.Time("2010-01-02T15:04:05Z")),
-		test.NewReadUnmarshal(&[]string{"http://4devs.io", "https://4devs.io"}, &[]string{}, "url"),
+		test.NewReadUnmarshal("url", &[]string{"http://4devs.io", "https://4devs.io"}, &[]string{}),
-		test.NewReadUnmarshal(&[]Duration{{time.Minute}, {time.Hour}}, &[]Duration{}, "timeout"),
+		test.NewReadUnmarshal("timeout", &[]time.Duration{time.Minute, time.Hour}, &[]time.Duration{}),
-		test.NewReadUnmarshal(&[]time.Time{
+		test.NewReadUnmarshal("end-after", &[]time.Time{
 			test.Time("2009-01-02T15:04:05Z"),
 			test.Time("2008-01-02T15:04:05+03:00"),
-		}, &[]time.Time{}, "end-after"),
+		}, &[]time.Time{}),
 	}
 
 	prov := arg.New()
 
 	test.Run(t, prov, read)
 }
-
-type Duration struct {
-	time.Duration
-}
-
-func (d *Duration) UnmarshalJSON(in []byte) error {
-	o, err := time.ParseDuration(strings.Trim(string(in), `"`))
-	if err != nil {
-		return fmt.Errorf("parse:%w", err)
-	}
-
-	d.Duration = o
-
-	return nil
-}
-
-func (d *Duration) MarshalJSON() ([]byte, error) {
-	return []byte(fmt.Sprintf("%q", d)), nil
-}

provider/env/provider.go

@@ -2,30 +2,27 @@ package env
 
 import (
 	"context"
-	"fmt"
 	"os"
 	"strings"
 
 	"gitoa.ru/go-4devs/config"
+	"gitoa.ru/go-4devs/config/key"
 	"gitoa.ru/go-4devs/config/value"
 )
 
-const Name = "env"
-
 var _ config.Provider = (*Provider)(nil)
 
 type Option func(*Provider)
 
-func WithKeyFactory(factory func(...string) string) Option {
+func WithKeyFactory(factory config.KeyFactory) Option {
 	return func(p *Provider) { p.key = factory }
 }
 
-func New(namespace, appName string, opts ...Option) *Provider {
+func New(opts ...Option) *Provider {
 	provider := Provider{
-		key: func(path ...string) string {
+		key: func(ctx context.Context, k config.Key) string {
-			return strings.ToUpper(strings.Join(path, "_"))
+			return strings.ToUpper(key.NsAppName("_")(ctx, k))
 		},
-		prefix: strings.ToUpper(namespace + "_" + appName + "_"),
 	}
 
 	for _, opt := range opts {
@@ -36,20 +33,26 @@ func New(namespace, appName string, opts ...Option) *Provider {
 }
 
 type Provider struct {
-	key    func(...string) string
+	key config.KeyFactory
-	name   string
-	prefix string
 }
 
 func (p *Provider) Name() string {
-	return p.name
+	return "env"
 }
 
-func (p *Provider) Value(_ context.Context, path ...string) (config.Value, error) {
+func (p *Provider) IsSupport(ctx context.Context, key config.Key) bool {
-	name := p.prefix + p.key(path...)
+	return p.key(ctx, key) != ""
+}
+
+func (p *Provider) Read(ctx context.Context, key config.Key) (config.Variable, error) {
+	name := p.key(ctx, key)
 	if val, ok := os.LookupEnv(name); ok {
-		return value.JString(val), nil
+		return config.Variable{
+			Name:     name,
+			Provider: p.Name(),
+			Value:    value.JString(val),
+		}, nil
 	}
 
-	return nil, fmt.Errorf("%v:%w", p.Name(), config.ErrValueNotFound)
+	return config.Variable{}, config.ErrVariableNotFound
 }

provider/env/provider_test.go

@@ -14,11 +14,11 @@ func TestProvider(t *testing.T) {
 	os.Setenv("FDEVS_CONFIG_DSN", test.DSN)
 	os.Setenv("FDEVS_CONFIG_PORT", "8080")
 
-	provider := env.New("fdevs", "config")
+	provider := env.New()
 
 	read := []test.Read{
-		test.NewRead(test.DSN, "dsn"),
+		test.NewRead("dsn", test.DSN),
-		test.NewRead(8080, "port"),
+		test.NewRead("port", 8080),
 	}
 	test.Run(t, provider, read)
 }

provider/etcd/provider.go

@@ -0,0 +1,109 @@
+package etcd
+
+import (
+	"context"
+	"fmt"
+
+	"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) {
+	name := p.key(ctx, key)
+
+	resp, err := p.client.Get(ctx, name, client.WithPrefix())
+	if err != nil {
+		return config.Variable{}, fmt.Errorf("%w: key:%s, prov:%s", err, name, p.Name())
+	}
+
+	val, err := p.resolve(name, resp.Kvs)
+	if err != nil {
+		return config.Variable{}, fmt.Errorf("%w: key:%s, prov:%s", err, name, 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)
+	}
+
+	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(),
+				Value:    nil,
+			}, nil
+		case string(kv.Key) == key:
+			return config.Variable{
+				Value:    value.JBytes(kv.Value),
+				Name:     key,
+				Provider: p.Name(),
+			}, nil
+		}
+	}
+
+	return config.Variable{}, fmt.Errorf("%w: name %s", config.ErrVariableNotFound, key)
+}

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()
+}

provider/ini/provider.go

@@ -0,0 +1,64 @@
+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 {
+	const nameParts = 2
+
+	return &Provider{
+		data: data,
+		resolve: func(ctx context.Context, key config.Key) (string, string) {
+			keys := strings.SplitN(key.Name, "/", nameParts)
+			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: %w", config.ErrVariableNotFound, p.Name(), err)
+	}
+
+	iniKey, err := iniSection.GetKey(name)
+	if err != nil {
+		return config.Variable{}, fmt.Errorf("%w: %s: %w", config.ErrVariableNotFound, p.Name(), err)
+	}
+
+	return config.Variable{
+		Name:     section + ":" + name,
+		Provider: p.Name(),
+		Value:    value.JString(iniKey.String()),
+	}, nil
+}

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)
+}

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, opts...), 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
+}

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)
+}

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 {
+	prov := &Provider{
+		tree: tree,
+		key:  key.Name,
+	}
+
+	for _, opt := range opts {
+		opt(prov)
+	}
+
+	return prov
+}
+
+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
+}

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)
+}

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: %w", config.ErrInvalidValue, err)
+	}
+
+	if err := json.Unmarshal(b, target); err != nil {
+		return fmt.Errorf("%w: %w", config.ErrInvalidValue, err)
+	}
+
+	return nil
+}

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 {
+	prov := SecretKV2{
+		client:  client,
+		resolve: key.LastIndexField(":", "value", key.PrefixName("secret/data/", key.NsAppName("/"))),
+	}
+
+	for _, opt := range opts {
+		opt(&prov)
+	}
+
+	return &prov
+}
+
+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)
+
+	secret, 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 secret == nil || len(secret.Data) == 0 {
+		return config.Variable{}, fmt.Errorf("%w: path:%s, field:%s, provider:%s", config.ErrVariableNotFound, path, field, p.Name())
+	}
+
+	if len(secret.Warnings) > 0 {
+		return config.Variable{},
+			fmt.Errorf("%w: warn: %s, path:%s, field:%s, provider:%s", config.ErrVariableNotFound, secret.Warnings, path, field, p.Name())
+	}
+
+	data, ok := secret.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 := data[field]; ok {
+		return config.Variable{
+			Name:     path + field,
+			Provider: p.Name(),
+			Value:    value.JString(fmt.Sprint(val)),
+		}, nil
+	}
+
+	md, err := json.Marshal(data)
+	if err != nil {
+		return config.Variable{}, fmt.Errorf("%w: %w", config.ErrInvalidValue, err)
+	}
+
+	return config.Variable{
+		Name:     path + field,
+		Provider: p.Name(),
+		Value:    value.JBytes(md),
+	}, nil
+}

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)
+}

provider/watcher/provider.go

@@ -2,9 +2,8 @@ package watcher
 
 import (
 	"context"
-	"errors"
 	"fmt"
-	"log/slog"
+	"log"
 	"time"
 
 	"gitoa.ru/go-4devs/config"
@@ -18,8 +17,10 @@ var (
 func New(duration time.Duration, provider config.Provider, opts ...Option) *Provider {
 	prov := &Provider{
 		Provider: provider,
-		duration: duration,
+		ticker:   time.NewTicker(duration),
-		logger:   slog.ErrorContext,
+		logger: func(_ context.Context, msg string) {
+			log.Print(msg)
+		},
 	}
 
 	for _, opt := range opts {
@@ -29,7 +30,7 @@ func New(duration time.Duration, provider config.Provider, opts ...Option) *Prov
 	return prov
 }
 
-func WithLogger(l func(context.Context, string, ...any)) Option {
+func WithLogger(l func(context.Context, string)) Option {
 	return func(p *Provider) {
 		p.logger = l
 	}
@@ -39,42 +40,32 @@ type Option func(*Provider)
 
 type Provider struct {
 	config.Provider
-	duration time.Duration
+	ticker *time.Ticker
-	logger   func(context.Context, string, ...any)
+	logger func(context.Context, string)
 }
 
-func (p *Provider) Watch(ctx context.Context, callback config.WatchCallback, key ...string) error {
+func (p *Provider) Watch(ctx context.Context, key config.Key, callback config.WatchCallback) error {
-	old, err := p.Provider.Value(ctx, key...)
+	oldVar, err := p.Provider.Read(ctx, key)
 	if err != nil {
 		return fmt.Errorf("failed watch variable: %w", err)
 	}
 
-	go func(oldVar config.Value) {
+	go func() {
-		ticker := time.NewTicker(p.duration)
-		defer func() {
-			ticker.Stop()
-		}()
-
 		for {
 			select {
-			case <-ticker.C:
+			case <-p.ticker.C:
-				newVar, err := p.Provider.Value(ctx, key...)
+				newVar, err := p.Provider.Read(ctx, key)
 				if err != nil {
-					p.logger(ctx, "get value%v:%v", key, err.Error())
+					p.logger(ctx, err.Error())
 				} else if !newVar.IsEquals(oldVar) {
-					if err := callback(ctx, oldVar, newVar); err != nil {
+					callback(ctx, oldVar, newVar)
-						if errors.Is(err, config.ErrStopWatch) {
-							return
-						}
-						p.logger(ctx, "callback %v:%v", key, err)
-					}
 					oldVar = newVar
 				}
 			case <-ctx.Done():
 				return
 			}
 		}
-	}(old)
+	}()
 
 	return nil
 }

provider/watcher/provider_test.go

@@ -2,20 +2,18 @@ package watcher_test
 
 import (
 	"context"
-	"strconv"
+	"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/test/require"
 	"gitoa.ru/go-4devs/config/value"
 )
 
-var _ config.Provider = (*provider)(nil)
-
 type provider struct {
 	cnt int32
 }
@@ -24,20 +22,20 @@ func (p *provider) Name() string {
 	return "test"
 }
 
-func (p *provider) Value(context.Context, ...string) (config.Value, error) {
+func (p *provider) Read(context.Context, config.Key) (config.Variable, error) {
 	p.cnt++
 
-	return value.JString(strconv.Itoa(int(p.cnt))), nil
+	return config.Variable{
+		Name:     "tmpname",
+		Provider: p.Name(),
+		Value:    value.JString(fmt.Sprint(p.cnt)),
+	}, nil
 }
 
 func TestWatcher(t *testing.T) {
 	t.Parallel()
 
-	ctx, cancel := context.WithTimeout(context.Background(), time.Second*2)
+	ctx := context.Background()
-	defer func() {
-		cancel()
-	}()
-
 	prov := &provider{}
 
 	w := watcher.New(time.Second, prov)
@@ -48,20 +46,14 @@ func TestWatcher(t *testing.T) {
 
 	err := w.Watch(
 		ctx,
-		func(ctx context.Context, oldVar, newVar config.Value) error {
+		config.Key{Name: "tmpname"},
+		func(ctx context.Context, oldVar, newVar config.Variable) {
 			atomic.AddInt32(&cnt, 1)
 			wg.Done()
-			if atomic.LoadInt32(&cnt) == 2 {
-				return config.ErrStopWatch
-			}
-
-			return nil
 		},
-		"tmpname",
 	)
-
+	require.NoError(t, err)
 	wg.Wait()
 
-	require.NoError(t, err)
 	require.Equal(t, int32(2), cnt)
 }

provider/yaml/provider.go

@@ -0,0 +1,108 @@
+package yaml
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"strings"
+
+	"gitoa.ru/go-4devs/config"
+	"gitoa.ru/go-4devs/config/value"
+	"gopkg.in/yaml.v3"
+)
+
+var _ config.Provider = (*Provider)(nil)
+
+func keyFactory(_ context.Context, key config.Key) []string {
+	return strings.Split(key.Name, "/")
+}
+
+func NewFile(name string, opts ...Option) (*Provider, error) {
+	in, err := ioutil.ReadFile(name)
+	if err != nil {
+		return nil, fmt.Errorf("yaml_file: read error: %w", err)
+	}
+
+	return New(in, opts...)
+}
+
+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)
+	}
+
+	return create(opts...).With(&data), nil
+}
+
+func create(opts ...Option) *Provider {
+	prov := Provider{
+		key: keyFactory,
+	}
+
+	for _, opt := range opts {
+		opt(&prov)
+	}
+
+	return &prov
+}
+
+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)
+}
+
+func (p *Provider) With(data *yaml.Node) *Provider {
+	return &Provider{
+		key:  p.key,
+		data: node{Node: data},
+	}
+}
+
+type node struct {
+	*yaml.Node
+}
+
+func (n *node) read(name string, keys []string) (config.Variable, error) {
+	val, err := getData(n.Node.Content[0].Content, keys)
+	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(keys, "."),
+		Provider: name,
+		Value:    value.Decode(val),
+	}, nil
+}
+
+func getData(node []*yaml.Node, keys []string) (func(interface{}) error, error) {
+	for idx := len(node) - 1; idx > 0; idx -= 2 {
+		if node[idx-1].Value == keys[0] {
+			if len(keys) > 1 {
+				return getData(node[idx].Content, keys[1:])
+			}
+
+			return node[idx].Decode, nil
+		}
+	}
+
+	return nil, config.ErrVariableNotFound
+}

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)
+}

provider/yaml/watch.go

@@ -0,0 +1,42 @@
+package yaml
+
+import (
+	"context"
+	"fmt"
+	"io/ioutil"
+
+	"gitoa.ru/go-4devs/config"
+	"gopkg.in/yaml.v3"
+)
+
+func NewWatch(name string, opts ...Option) *Watch {
+	f := Watch{
+		file: name,
+		prov: create(opts...),
+	}
+
+	return &f
+}
+
+type Watch struct {
+	file string
+	prov *Provider
+}
+
+func (p *Watch) Name() string {
+	return "yaml_watch"
+}
+
+func (p *Watch) 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 yNode yaml.Node
+	if err = yaml.Unmarshal(in, &yNode); err != nil {
+		return config.Variable{}, fmt.Errorf("yaml_file: unmarshal error: %w", err)
+	}
+
+	return p.prov.With(&yNode).Read(ctx, key)
+}

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
+}

test/fixture/config.json

@@ -0,0 +1,17 @@
+{
+    "app": {
+        "name": {
+            "var": [
+                "name"
+            ],
+            "title": "config title",
+            "timeout": "1m",
+            "success": true
+        }
+    },
+    "cfg": {
+        "duration": 1260000000000,
+        "enabled": true,
+        "type":"json"
+    }
+}

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"
+]

test/fixture/config.yaml

@@ -0,0 +1,14 @@
+app:
+    title: yaml title
+    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
+    type: yaml

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
+}

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
+}

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
+}

test/provider_suite.go

@@ -2,12 +2,14 @@ package test
 
 import (
 	"context"
-	"fmt"
+	"io/ioutil"
+	"path/filepath"
 	"testing"
 	"time"
 
+	"github.com/stretchr/testify/require"
+	"github.com/stretchr/testify/suite"
 	"gitoa.ru/go-4devs/config"
-	"gitoa.ru/go-4devs/config/test/require"
 )
 
 const (
@@ -19,39 +21,47 @@ const (
 func Run(t *testing.T, provider config.Provider, read []Read) {
 	t.Helper()
 
-	ctx := context.Background()
+	prov := &ProviderSuite{
-
+		provider: provider,
-	for idx, read := range read {
+		read:     read,
-		t.Run(fmt.Sprintf("%v:%v", idx, read.Key), func(t *testing.T) {
-			val, err := provider.Value(ctx, read.Key...)
-			require.NoError(t, err, read.Key)
-			read.Assert(t, val)
-		})
 	}
+	suite.Run(t, prov)
+}
+
+type ProviderSuite struct {
+	suite.Suite
+	provider config.Provider
+	read     []Read
 }
 
 type Read struct {
-	Key    []string
+	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 {
+func NewReadConfig(key string) Read {
 	ex := &Config{
 		Duration: 21 * time.Minute,
 		Enabled:  true,
 	}
 
-	return NewReadUnmarshal(ex, &Config{}, key...)
+	return NewReadUnmarshal(key, ex, &Config{})
 }
 
-func NewReadUnmarshal(expected, target interface{}, key ...string) Read {
+func NewReadUnmarshal(key string, expected, target interface{}) Read {
 	return Read{
-		Key: key,
+		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")
@@ -67,9 +77,13 @@ func Time(value string) time.Time {
 }
 
 // nolint: cyclop
-func NewRead(expected interface{}, key ...string) Read {
+func NewRead(key string, expected interface{}) Read {
 	return Read{
-		Key: key,
+		Key: config.Key{
+			Namespace: "fdevs",
+			AppName:   "config",
+			Name:      key,
+		},
 		Assert: func(t *testing.T, v config.Value) {
 			t.Helper()
 			var (
@@ -106,7 +120,7 @@ func NewRead(expected interface{}, key ...string) Read {
 				val, err = v.ParseTime()
 				short = v.Time()
 			default:
-				require.Fail(t, "unexpected type:%+T", expected)
+				require.Fail(t, "unexpected type", "type:%+T", expected)
 			}
 
 			require.Equalf(t, val, short, "type:%T", expected)
@@ -115,3 +129,22 @@ func NewRead(expected interface{}, key ...string) Read {
 		},
 	}
 }
+
+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
+}

test/require/equal.go

@@ -1,28 +0,0 @@
-package require
-
-import (
-	"reflect"
-	"testing"
-)
-
-func Equal(t *testing.T, expected interface{}, actual interface{}, msgAndArgs ...interface{}) {
-	t.Helper()
-
-	if reflect.DeepEqual(expected, actual) {
-		return
-	}
-
-	t.Error(msgAndArgs...)
-	t.FailNow()
-}
-
-func Equalf(t *testing.T, expected interface{}, actual interface{}, msg string, args ...interface{}) {
-	t.Helper()
-
-	if reflect.DeepEqual(expected, actual) {
-		return
-	}
-
-	t.Errorf(msg, args...)
-	t.FailNow()
-}

test/require/error.go

@@ -1,23 +0,0 @@
-package require
-
-import (
-	"testing"
-)
-
-func NoError(t *testing.T, err error, msgAndArgs ...interface{}) {
-	t.Helper()
-
-	if err != nil {
-		t.Error(msgAndArgs...)
-		t.FailNow()
-	}
-}
-
-func NoErrorf(t *testing.T, err error, msg string, args ...interface{}) {
-	t.Helper()
-
-	if err != nil {
-		t.Errorf(msg, args...)
-		t.FailNow()
-	}
-}

test/require/fail.go

@@ -1,9 +0,0 @@
-package require
-
-import "testing"
-
-func Fail(t *testing.T, msg string, args ...interface{}) {
-	t.Helper()
-	t.Errorf(msg, args...)
-	t.FailNow()
-}

test/require/true.go

@@ -1,14 +0,0 @@
-package require
-
-import (
-	"testing"
-)
-
-func Truef(t *testing.T, value bool, msg string, args ...interface{}) {
-	t.Helper()
-
-	if !value {
-		t.Errorf(msg, args...)
-		t.FailNow()
-	}
-}

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()
+}

value.go

@@ -8,7 +8,6 @@ type Value interface {
 	ReadValue
 	ParseValue
 	UnmarshalValue
-	IsEquals(in Value) bool
 }
 
 type UnmarshalValue interface {

value/decode.go

@@ -108,7 +108,3 @@ func (s Decode) Time() time.Time {
 
 	return in
 }
-
-func (s Decode) IsEquals(in config.Value) bool {
-	return s.String() == in.String()
-}

value/jbytes.go

@@ -110,7 +110,3 @@ func (s JBytes) Time() time.Time {
 
 	return in
 }
-
-func (s JBytes) IsEquals(in config.Value) bool {
-	return s.String() == in.String()
-}

value/jstring.go

@@ -110,7 +110,3 @@ func (s JString) Time() time.Time {
 
 	return in
 }
-
-func (s JString) IsEquals(in config.Value) bool {
-	return s.String() == in.String()
-}

value/jstring_test.go

@@ -5,8 +5,8 @@ import (
 	"testing"
 	"time"
 
+	"github.com/stretchr/testify/require"
 	"gitoa.ru/go-4devs/config"
-	"gitoa.ru/go-4devs/config/test/require"
 	"gitoa.ru/go-4devs/config/value"
 )
 

value/value.go

@@ -156,7 +156,3 @@ func (s Value) ParseTime() (time.Time, error) {
 
 	return time.Time{}, config.ErrInvalidValue
 }
-
-func (s Value) IsEquals(in config.Value) bool {
-	return s.String() == in.String()
-}

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()
+}