update deps

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

.github/dependabot.yml

@@ -0,0 +1,19 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+
+  # Maintain dependencies for GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+
+  # Maintain dependencies for Golang
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "daily"

.github/stale.sh

@@ -1,13 +0,0 @@
-#!/bin/bash -ex
-
-export PATH=$PATH:$(pwd)/bin
-export GO111MODULE=on
-export GOBIN=$(pwd)/bin
-
-#go get github.com/rvflash/goup@v0.4.1
-
-#goup -v ./...
-#go get github.com/psampaz/go-mod-outdated@v0.6.0
-go list -u -m -mod=mod -json all | go-mod-outdated -update -direct -ci || true
-
-#go list -u -m -json all | go-mod-outdated -update

.github/workflows/autoapprove.yml

@@ -0,0 +1,20 @@
+name: "autoapprove"
+
+on:
+  pull_request_target:
+    types: [assigned, opened, synchronize, reopened]
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  autoapprove:
+    runs-on: ubuntu-latest
+    steps:
+      - name: approve
+        uses: hmarr/auto-approve-action@v3
+        if: github.actor == 'vtolstov' || github.actor == 'dependabot[bot]'
+        id: approve
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/automerge.yml

@@ -0,0 +1,21 @@
+name: "automerge"
+
+on:
+  pull_request_target:
+    types: [assigned, opened, synchronize, reopened]
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  automerge:
+    runs-on: ubuntu-latest
+    if: github.actor == 'vtolstov'
+    steps:
+      - name: merge
+        id: merge
+        run: gh pr merge --auto --merge "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.TOKEN}}

.github/workflows/build.yml

@@ -3,19 +3,20 @@ on:
  push:
     branches:
     - master
+    - v3
 jobs:
   test:
     name: test
     runs-on: ubuntu-latest
     steps:
     - name: setup
-      uses: actions/setup-go@v1
+      uses: actions/setup-go@v3
       with:
-        go-version: 1.15
+        go-version: 1.17
     - name: checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: cache
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: ~/go/pkg/mod
         key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
@@ -31,9 +32,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: lint
-        uses: golangci/golangci-lint-action@v1
+        uses: golangci/golangci-lint-action@v3.4.0
         continue-on-error: true
         with:
           # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.

.github/workflows/codeql-analysis.yml

@@ -0,0 +1,78 @@
+# For most projects, this workflow file will not need changing; you simply need
+# to commit it to your repository.
+#
+# You may wish to alter this file to override the set of languages analyzed,
+# or to provide custom queries or build logic.
+#
+# ******** NOTE ********
+# We have attempted to detect the languages in your repository. Please check
+# the `language` matrix defined below to confirm you have the correct set of
+# supported CodeQL languages.
+#
+name: "codeql"
+
+on:
+  workflow_run:
+    workflows: ["prbuild"]
+    types:
+      - completed
+  push:
+    branches: [ master, v3 ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ master, v3 ]
+  schedule:
+    - cron: '34 1 * * 0'
+
+jobs:
+  analyze:
+    name: analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'go' ]
+        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python' ]
+        # Learn more:
+        # https://docs.github.com/en/free-pro-team@latest/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#changing-the-languages-that-are-analyzed
+
+    steps:
+    - name: checkout
+      uses: actions/checkout@v3
+    - name: setup
+      uses: actions/setup-go@v3
+      with:
+        go-version: 1.17
+    # Initializes the CodeQL tools for scanning.
+    - name: init
+      uses: github/codeql-action/init@v2
+      with:
+        languages: ${{ matrix.language }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+        # queries: ./path/to/local/query, your-org/your-repo/queries@main
+
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    - name: autobuild
+      uses: github/codeql-action/autobuild@v2
+
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 https://git.io/JvXDl
+
+    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
+    #    and modify them (or add more) to build your code if your project
+    #    uses a compiled language
+
+    #- run: |
+    #   make bootstrap
+    #   make release
+
+    - name: analyze
+      uses: github/codeql-action/analyze@v2

.github/workflows/dependabot-automerge.yml

@@ -0,0 +1,27 @@
+name: "dependabot-automerge"
+
+on:
+  pull_request_target:
+    types: [assigned, opened, synchronize, reopened]
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  automerge:
+    runs-on: ubuntu-latest
+    if: github.actor == 'dependabot[bot]'
+    steps:
+      - name: metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@v1.3.6
+        with:
+          github-token: "${{ secrets.TOKEN }}"
+      - name: merge
+        id: merge
+        if: ${{contains(steps.metadata.outputs.dependency-names, 'go.unistack.org')}}
+        run: gh pr merge --auto --merge "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.TOKEN}}

.github/workflows/pr.yml

@@ -3,19 +3,20 @@ on:
   pull_request:
     branches:
     - master
+    - v3
 jobs:
   test:
     name: test
     runs-on: ubuntu-latest
     steps:
     - name: setup
-      uses: actions/setup-go@v1
+      uses: actions/setup-go@v3
       with:
-        go-version: 1.15
+        go-version: 1.17
     - name: checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: cache
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: ~/go/pkg/mod
         key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
@@ -31,9 +32,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: lint
-        uses: golangci/golangci-lint-action@v1
+        uses: golangci/golangci-lint-action@v3.4.0
         continue-on-error: true
         with:
           # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.

env.go

@@ -1,19 +1,20 @@
-package env
+package env // import "go.unistack.org/micro-config-env/v4"
 
 import (
 	"context"
+	"fmt"
 	"os"
 	"reflect"
 	"strconv"
 	"strings"
 
-	"github.com/imdario/mergo"
-	"github.com/unistack-org/micro/v3/config"
+"dario.cat/mergo"
+	"go.unistack.org/micro/v4/config"
+	"go.unistack.org/micro/v4/options"
+	rutil "go.unistack.org/micro/v4/util/reflect"
 )
 
-var (
-	DefaultStructTag = "env"
-)
+var DefaultStructTag = "env"
 
 type envConfig struct {
 	opts config.Options
@@ -23,42 +24,64 @@ func (c *envConfig) Options() config.Options {
 	return c.opts
 }
 
-func (c *envConfig) Init(opts ...config.Option) error {
+func (c *envConfig) Init(opts ...options.Option) error {
 	for _, o := range opts {
 		o(&c.opts)
 	}
+
+	if err := config.DefaultBeforeInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
+		return err
+	}
+
+	if err := config.DefaultAfterInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
+		return err
+	}
+
 	return nil
 }
 
-func (c *envConfig) Load(ctx context.Context) error {
-	for _, fn := range c.opts.BeforeLoad {
-		if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
+func (c *envConfig) Load(ctx context.Context, opts ...options.Option) error {
+	if c.opts.SkipLoad != nil && c.opts.SkipLoad(ctx, c) {
+		return nil
+	}
+
+	if err := config.DefaultBeforeLoad(ctx, c); err != nil && !c.opts.AllowFail {
 		return err
 	}
+
+	options := config.NewLoadOptions(opts...)
+	mopts := []func(*mergo.Config){mergo.WithTypeCheck}
+	if options.Override {
+		mopts = append(mopts, mergo.WithOverride)
+	}
+	if options.Append {
+		mopts = append(mopts, mergo.WithAppendSlice)
+	}
+
+	dst := c.opts.Struct
+	if options.Struct != nil {
+		dst = options.Struct
+	}
+
+	src, err := rutil.Zero(dst)
+	if err == nil {
+		if err = fillValues(ctx, reflect.ValueOf(src), c.opts.StructTag); err == nil {
+			err = mergo.Merge(dst, src, mopts...)
+		}
 	}
 
-	src, err := config.Zero(c.opts.Struct)
-	if err == nil {
-		err = c.fillValues(ctx, reflect.ValueOf(src))
-	}
 	if err != nil && !c.opts.AllowFail {
 		return err
 	}
 
-	if err = mergo.Merge(c.opts.Struct, src, mergo.WithOverride, mergo.WithTypeCheck, mergo.WithAppendSlice); err != nil && !c.opts.AllowFail {
+	if err := config.DefaultAfterLoad(ctx, c); err != nil && !c.opts.AllowFail {
 		return err
 	}
 
-	for _, fn := range c.opts.AfterLoad {
-		if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
-			return err
-		}
-	}
-
 	return nil
 }
 
-func (c *envConfig) fillValue(ctx context.Context, value reflect.Value, val string) error {
+func fillValue(ctx context.Context, value reflect.Value, val string) error {
 	switch value.Kind() {
 	case reflect.Map:
 		t := value.Type()
@@ -72,10 +95,10 @@ func (c *envConfig) fillValue(ctx context.Context, value reflect.Value, val stri
 			kv := strings.FieldsFunc(nval, func(c rune) bool { return c == '=' })
 			mkey := reflect.Indirect(reflect.New(kt))
 			mval := reflect.Indirect(reflect.New(et))
-			if err := c.fillValue(ctx, mkey, kv[0]); err != nil {
+			if err := fillValue(ctx, mkey, kv[0]); err != nil {
 				return err
 			}
-			if err := c.fillValue(ctx, mval, kv[1]); err != nil {
+			if err := fillValue(ctx, mval, kv[1]); err != nil {
 				return err
 			}
 			value.SetMapIndex(mkey, mval)
@@ -85,7 +108,7 @@ func (c *envConfig) fillValue(ctx context.Context, value reflect.Value, val stri
 		value.Set(reflect.MakeSlice(reflect.SliceOf(value.Type().Elem()), len(nvals), len(nvals)))
 		for idx, nval := range nvals {
 			nvalue := reflect.Indirect(reflect.New(value.Type().Elem()))
-			if err := c.fillValue(ctx, nvalue, nval); err != nil {
+			if err := fillValue(ctx, nvalue, nval); err != nil {
 				return err
 			}
 			value.Index(idx).Set(nvalue)
@@ -174,7 +197,59 @@ func (c *envConfig) fillValue(ctx context.Context, value reflect.Value, val stri
 	return nil
 }
 
-func (c *envConfig) fillValues(ctx context.Context, valueOf reflect.Value) error {
+func (c *envConfig) setValues(ctx context.Context, valueOf reflect.Value) error {
+	var values reflect.Value
+
+	if valueOf.Kind() == reflect.Ptr {
+		values = valueOf.Elem()
+	} else {
+		values = valueOf
+	}
+
+	if values.Kind() == reflect.Invalid {
+		return config.ErrInvalidStruct
+	}
+
+	fields := values.Type()
+
+	for idx := 0; idx < fields.NumField(); idx++ {
+		field := fields.Field(idx)
+		value := values.Field(idx)
+		if rutil.IsZero(value) {
+			continue
+		}
+		if len(field.PkgPath) != 0 {
+			continue
+		}
+		switch value.Kind() {
+		case reflect.Struct:
+			if err := c.setValues(ctx, value); err != nil {
+				return err
+			}
+			continue
+		case reflect.Ptr:
+			value = value.Elem()
+			if err := c.setValues(ctx, value); err != nil {
+				return err
+			}
+			continue
+		}
+
+		tags, ok := field.Tag.Lookup(c.opts.StructTag)
+		if !ok {
+			continue
+		}
+		for _, tag := range strings.Split(tags, ",") {
+			if err := os.Setenv(tag, fmt.Sprintf("%v", value.Interface())); err != nil && !c.opts.AllowFail {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
+func fillValues(ctx context.Context, valueOf reflect.Value, structTag string) error {
 	var values reflect.Value
 
 	if valueOf.Kind() == reflect.Ptr {
@@ -201,7 +276,7 @@ func (c *envConfig) fillValues(ctx context.Context, valueOf reflect.Value) error
 		switch value.Kind() {
 		case reflect.Struct:
 			value.Set(reflect.Indirect(reflect.New(value.Type())))
-			if err := c.fillValues(ctx, value); err != nil {
+			if err := fillValues(ctx, value, structTag); err != nil {
 				return err
 			}
 			continue
@@ -215,21 +290,29 @@ func (c *envConfig) fillValues(ctx context.Context, valueOf reflect.Value) error
 				value.Set(reflect.New(value.Type().Elem()))
 			}
 			value = value.Elem()
-			if err := c.fillValues(ctx, value); err != nil {
+			if err := fillValues(ctx, value, structTag); err != nil {
 				return err
 			}
 			continue
 		}
-		tag, ok := field.Tag.Lookup(c.opts.StructTag)
-		if !ok {
-			return nil
-		}
-		val, ok := os.LookupEnv(tag)
+		tags, ok := field.Tag.Lookup(structTag)
 		if !ok {
 			continue
 		}
 
-		if err := c.fillValue(ctx, value, val); err != nil {
+		var eval string
+		for _, tag := range strings.Split(tags, ",") {
+			if val, ok := os.LookupEnv(tag); !ok {
+				continue
+			} else {
+				eval = val
+			}
+		}
+		if eval == "" {
+			continue
+		}
+
+		if err := fillValue(ctx, value, eval); err != nil {
 			return err
 		}
 	}
@@ -237,17 +320,28 @@ func (c *envConfig) fillValues(ctx context.Context, valueOf reflect.Value) error
 	return nil
 }
 
-func (c *envConfig) Save(ctx context.Context) error {
-	for _, fn := range c.opts.BeforeSave {
-		if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
-			return err
-		}
+func (c *envConfig) Save(ctx context.Context, opts ...options.Option) error {
+	if c.opts.SkipSave != nil && c.opts.SkipSave(ctx, c) {
+		return nil
 	}
 
-	for _, fn := range c.opts.AfterSave {
-		if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
+	options := config.NewSaveOptions(opts...)
+
+	if err := config.DefaultBeforeSave(ctx, c); err != nil && !c.opts.AllowFail {
 		return err
 	}
+
+	dst := c.opts.Struct
+	if options.Struct != nil {
+		dst = options.Struct
+	}
+
+	if err := c.setValues(ctx, reflect.ValueOf(dst)); err != nil && !c.opts.AllowFail {
+		return err
+	}
+
+	if err := config.DefaultAfterSave(ctx, c); err != nil && !c.opts.AllowFail {
+		return err
 	}
 
 	return nil
@@ -257,7 +351,25 @@ func (c *envConfig) String() string {
 	return "env"
 }
 
-func NewConfig(opts ...config.Option) config.Config {
+func (c *envConfig) Name() string {
+	return c.opts.Name
+}
+
+func (c *envConfig) Watch(ctx context.Context, opts ...options.Option) (config.Watcher, error) {
+	w := &envWatcher{
+		opts:  c.opts,
+		wopts: config.NewWatchOptions(opts...),
+		done:  make(chan struct{}),
+		vchan: make(chan map[string]interface{}),
+		echan: make(chan error),
+	}
+
+	go w.run()
+
+	return w, nil
+}
+
+func NewConfig(opts ...options.Option) config.Config {
 	options := config.NewOptions(opts...)
 	if len(options.StructTag) == 0 {
 		options.StructTag = DefaultStructTag

env_test.go

@@ -1,16 +1,17 @@
-package env_test
+package env
 
 import (
 	"context"
 	"os"
 	"testing"
+	"time"
 
-	env "github.com/unistack-org/micro-config-env/v3"
-	"github.com/unistack-org/micro/v3/config"
+	"go.unistack.org/micro/v4/config"
+	rutil "go.unistack.org/micro/v4/util/reflect"
 )
 
 type Config struct {
-	StringValue    string            `env:"STRING_VALUE"`
+	StringValue    string            `env:"STRING_VALUE,STRING_VALUE2"`
 	BoolValue      bool              `env:"BOOL_VALUE"`
 	StringSlice    []string          `env:"STRING_SLICE"`
 	IntSlice       []int             `env:"INT_SLICE"`
@@ -18,16 +19,81 @@ type Config struct {
 	MapIntValue    map[string]int    `env:"MAP_INT"`
 }
 
-func TestEnv(t *testing.T) {
+func TestMerge(t *testing.T) {
+	defer func() {
+		for _, v := range []string{"STRING_VALUE", "BOOL_VALUE", "STRING_SLICE", "INT_SLICE", "MAP_STRING", "MAP_INT"} {
+			if err := os.Unsetenv(v); err != nil {
+				t.Fatal(err)
+			}
+		}
+	}()
+
 	ctx := context.Background()
-	conf := &Config{StringValue: "before_load"}
-	cfg := env.NewConfig(config.Struct(conf))
+	type Nested struct {
+		Name string `env:"NAME_VALUE"`
+	}
+	type Cfg struct {
+		Name   string `env:"NAME_VALUE"`
+		Nested Nested
+	}
+
+	conf := &Cfg{}
+
+	cfg := NewConfig(config.Struct(conf))
 
 	if err := cfg.Init(); err != nil {
 		t.Fatal(err)
 	}
 
-	if err := cfg.Load(ctx); err != nil {
+	if err := cfg.Load(ctx, config.LoadOverride(true), config.LoadAppend(true)); err != nil {
+		t.Fatal(err)
+	}
+
+	w, err := cfg.Watch(ctx, config.WatchInterval(50*time.Millisecond, 500*time.Millisecond))
+	defer func() {
+		if err := w.Stop(); err != nil {
+			t.Fatal(err)
+		}
+	}()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	os.Setenv("NAME_VALUE", "after")
+	changes, err := w.Next()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	for k, v := range changes {
+		if err := rutil.SetFieldByPath(conf, v, k); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	if conf.Name != "after" || conf.Nested.Name != "after" {
+		t.Fatalf("changes %#+v not applied to %#+v", changes, conf)
+	}
+}
+
+func TestLoad(t *testing.T) {
+	defer func() {
+		for _, v := range []string{"STRING_VALUE", "STRING_VALUE2", "BOOL_VALUE", "STRING_SLICE", "INT_SLICE", "MAP_STRING", "MAP_INT"} {
+			if err := os.Unsetenv(v); err != nil {
+				t.Fatal(err)
+			}
+		}
+	}()
+
+	ctx := context.Background()
+	conf := &Config{StringValue: "before_load"}
+	cfg := NewConfig(config.Struct(conf))
+
+	if err := cfg.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := cfg.Load(ctx, config.LoadOverride(true), config.LoadAppend(true)); err != nil {
 		t.Fatal(err)
 	}
 
@@ -42,7 +108,7 @@ func TestEnv(t *testing.T) {
 	os.Setenv("MAP_STRING", "key1=val1,key2=val2")
 	os.Setenv("MAP_INT", "key1=1,key2=2")
 
-	if err := cfg.Load(ctx); err != nil {
+	if err := cfg.Load(ctx, config.LoadOverride(true), config.LoadAppend(true)); err != nil {
 		t.Fatal(err)
 	}
 	if conf.StringValue != "STRING_VALUE" {
@@ -65,5 +131,110 @@ func TestEnv(t *testing.T) {
 		t.Fatalf("something wrong with env config: %#+v", conf.MapIntValue)
 	}
 
-	t.Logf("cfg %#+v", conf)
+	for _, v := range []string{"STRING_VALUE", "STRING_VALUE2", "BOOL_VALUE", "STRING_SLICE", "INT_SLICE", "MAP_STRING", "MAP_INT"} {
+		if err := os.Unsetenv(v); err != nil {
+			t.Fatal(err)
+		}
+	}
+}
+
+func TestSave(t *testing.T) {
+	defer func() {
+		for _, v := range []string{"STRING_VALUE", "STRING_VALUE2", "BOOL_VALUE", "STRING_SLICE", "INT_SLICE", "MAP_STRING", "MAP_INT"} {
+			if err := os.Unsetenv(v); err != nil {
+				t.Fatal(err)
+			}
+		}
+	}()
+
+	ctx := context.Background()
+	conf := &Config{StringValue: "MICRO_CONFIG_ENV"}
+	cfg := NewConfig(config.Struct(conf))
+
+	if err := cfg.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	if _, ok := os.LookupEnv("STRING_VALUE"); ok {
+		if err := os.Unsetenv("STRING_VALUE"); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	if err := os.Unsetenv("STRING_VALUE"); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := cfg.Save(ctx); err != nil {
+		t.Fatal(err)
+	}
+
+	if _, ok := os.LookupEnv("STRING_VALUE"); !ok {
+		t.Fatal("env value STRING_VALUE=MICRO_CONFIG_ENV not set")
+	}
+
+	if err := os.Unsetenv("STRING_VALUE"); err != nil {
+		t.Fatal(err)
+	}
+
+	for _, tv := range []string{"STRING_VALUE", "BOOL_VALUE", "STRING_SLICE", "INT_SLICE", "MAP_STRING", "MAP_INT"} {
+		if v, ok := os.LookupEnv("STRING_VALUE"); ok {
+			t.Fatalf("env value %s=%s set", tv, v)
+		}
+	}
+
+	for _, v := range []string{"STRING_VALUE", "STRING_VALUE2", "BOOL_VALUE", "STRING_SLICE", "INT_SLICE", "MAP_STRING", "MAP_INT"} {
+		if err := os.Unsetenv(v); err != nil {
+			t.Fatal(err)
+		}
+	}
+}
+
+func TestLoadMultiple(t *testing.T) {
+	defer func() {
+		for _, v := range []string{"STRING_VALUE", "STRING_VALUE2", "BOOL_VALUE", "STRING_SLICE", "INT_SLICE", "MAP_STRING", "MAP_INT"} {
+			if err := os.Unsetenv(v); err != nil {
+				t.Fatal(err)
+			}
+		}
+	}()
+
+	ctx := context.Background()
+	conf := &Config{StringValue: "before_load"}
+	cfg := NewConfig(config.Struct(conf))
+
+	if err := cfg.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := cfg.Load(ctx, config.LoadOverride(true), config.LoadAppend(true)); err != nil {
+		t.Fatal(err)
+	}
+
+	if conf.StringValue != "before_load" {
+		t.Fatalf("something wrong with env config: %#+v", conf)
+	}
+
+	os.Setenv("STRING_VALUE", "STRING_VALUE1")
+	os.Setenv("STRING_VALUE2", "STRING_VALUE2")
+	defer func() {
+		for _, v := range []string{"STRING_VALUE", "STRING_VALUE2"} {
+			if err := os.Unsetenv(v); err != nil {
+				t.Fatal(err)
+			}
+		}
+	}()
+
+	if err := cfg.Load(ctx, config.LoadOverride(true), config.LoadAppend(true)); err != nil {
+		t.Fatal(err)
+	}
+	if conf.StringValue != "STRING_VALUE2" {
+		t.Fatalf("something wrong with env config: %#+v", conf)
+	}
+
+	for _, v := range []string{"STRING_VALUE", "STRING_VALUE2", "BOOL_VALUE", "STRING_SLICE", "INT_SLICE", "MAP_STRING", "MAP_INT"} {
+		if err := os.Unsetenv(v); err != nil {
+			t.Fatal(err)
+		}
+	}
 }

go.mod

@@ -1,8 +1,10 @@
-module github.com/unistack-org/micro-config-env/v3
+module go.unistack.org/micro-config-env/v4
 
-go 1.15
+go 1.20
 
 require (
-	github.com/imdario/mergo v0.3.11
-	github.com/unistack-org/micro/v3 v3.1.1
+	dario.cat/mergo v1.0.0
+	go.unistack.org/micro/v4 v4.0.15
 )
+
+require github.com/google/uuid v1.5.0 // indirect

go.sum

@@ -1,436 +1,9 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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-cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
-cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
-cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
-cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
-cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
-cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
-cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
-cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
-cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
-cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
-contrib.go.opencensus.io/exporter/ocagent v0.4.12/go.mod h1:450APlNTSR6FrvC3CTRqYosuDstRB9un7SOx2k/9ckA=
-dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
-github.com/Azure/azure-sdk-for-go v32.4.0+incompatible/go.mod h1:9XXNKU+eRnpl9moKnB4QOLf1HestfXbmab5FXxiDBjc=
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watcher.go

@@ -0,0 +1,82 @@
+package env
+
+import (
+	"reflect"
+
+	"go.unistack.org/micro/v4/config"
+	"go.unistack.org/micro/v4/util/jitter"
+	rutil "go.unistack.org/micro/v4/util/reflect"
+)
+
+type envWatcher struct {
+	opts  config.Options
+	wopts config.WatchOptions
+	done  chan struct{}
+	vchan chan map[string]interface{}
+	echan chan error
+}
+
+func (w *envWatcher) run() {
+	ticker := jitter.NewTicker(w.wopts.MinInterval, w.wopts.MaxInterval)
+	defer ticker.Stop()
+
+	src := w.opts.Struct
+	if w.wopts.Struct != nil {
+		src = w.wopts.Struct
+	}
+
+	for {
+		select {
+		case <-w.done:
+			return
+		case <-ticker.C:
+			dst, err := rutil.Zero(src)
+			if err == nil {
+				err = fillValues(w.opts.Context, reflect.ValueOf(dst), w.opts.StructTag)
+			}
+			if err != nil {
+				w.echan <- err
+				return
+			}
+			srcmp, err := rutil.StructFieldsMap(src)
+			if err != nil {
+				w.echan <- err
+				return
+			}
+			dstmp, err := rutil.StructFieldsMap(dst)
+			if err != nil {
+				w.echan <- err
+				return
+			}
+			for sk, sv := range srcmp {
+				if reflect.DeepEqual(dstmp[sk], sv) {
+					delete(dstmp, sk)
+				}
+			}
+			if len(dstmp) > 0 {
+				w.vchan <- dstmp
+				src = dst
+			}
+		}
+	}
+}
+
+func (w *envWatcher) Next() (map[string]interface{}, error) {
+	select {
+	case <-w.done:
+		break
+	case err := <-w.echan:
+		return nil, err
+	case v, ok := <-w.vchan:
+		if !ok {
+			break
+		}
+		return v, nil
+	}
+	return nil, config.ErrWatcherStopped
+}
+
+func (w *envWatcher) Stop() error {
+	close(w.done)
+	return nil
+}