add parsing for time (#121)

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

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,6 +1,6 @@
 ---
 name: Bug report
-about: For reporting bugs in go-micro
+about: For reporting bugs in micro
 title: "[BUG]"
 labels: ''
 assignees: ''
@@ -16,9 +16,3 @@ assignees: ''
 **How to reproduce the bug:**
 
 If possible, please include a minimal code snippet here.
-
-**Environment:**
-Go Version: please paste `go version` output here
-```
-please paste `go env` output here
-```

.github/ISSUE_TEMPLATE/feature-request---enhancement.md

@@ -1,6 +1,6 @@
 ---
 name: Feature request / Enhancement
-about: If you have a need not served by go-micro
+about: If you have a need not served by micro
 title: "[FEATURE]"
 labels: ''
 assignees: ''
@@ -14,4 +14,4 @@ A clear and concise description of what the problem is. Ex. I'm always frustrate
 A clear and concise description of what you want to happen.
 
 **Additional context**
-Add any other context or screenshots about the feature request here.
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/question.md

@@ -1,14 +1,8 @@
 ---
 name: Question
-about: Ask a question about go-micro
+about: Ask a question about micro
 title: ''
 labels: ''
 assignees: ''
 
----
-
-Before asking, please check if your question has already been answered: 
-
-1. Check the documentation - https://micro.mu/docs/
-2. Check the examples and plugins - https://github.com/micro/examples & https://github.com/micro/go-plugins
-3. Search existing issues
+---

.github/autoapprove.yml

@@ -0,0 +1,28 @@
+name: "autoapprove"
+
+on:
+  pull_request_target:
+    types: [assigned, opened, synchronize, reopened]
+  workflow_run:
+    workflows: ["prbuild"]
+    types:
+      - completed
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  autoapprove:
+    runs-on: ubuntu-latest
+    steps:
+      - name: approve
+        run: [ "curl -o tea https://dl.gitea.com/tea/main/tea-main-linux-amd64",
+               "chmod +x ./tea",
+               "./tea login add --name unistack --token ${{ secrets.GITHUB_TOKEN }} --url https://git.unistack.org",
+               "./tea pr --repo ${{ github.event.repository.name }}"
+        ]
+        if: github.actor == 'vtolstov'
+        id: approve
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}

.github/renovate.json

@@ -1,19 +0,0 @@
-{
-  "extends": [
-    "config:base"
-  ],
-  "packageRules": [
-    {
-      "matchUpdateTypes": ["minor", "patch", "pin", "digest"],
-      "automerge": true
-    },
-    {
-      "groupName": "all deps",
-      "separateMajorMinor": true,
-      "groupSlug": "all",
-      "packagePatterns": [
-        "*"
-      ]
-    }
-  ]
-}

.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/build.yml

@@ -1,46 +0,0 @@
-name: build
-on:
- push:
-    branches:
-    - master
-jobs:
-  test:
-    name: test
-    runs-on: ubuntu-latest
-    steps:
-    - name: setup
-      uses: actions/setup-go@v2
-      with:
-        go-version: 1.16
-    - name: checkout
-      uses: actions/checkout@v2
-    - name: cache
-      uses: actions/cache@v2
-      with:
-        path: ~/go/pkg/mod
-        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-        restore-keys: ${{ runner.os }}-go-
-    - name: deps
-      run: go get -v -t -d ./...
-    - name: test
-      env:
-        INTEGRATION_TESTS: yes
-      run: go test -mod readonly -v ./...
-  lint:
-    name: lint
-    runs-on: ubuntu-latest
-    steps:
-      - name: checkout
-        uses: actions/checkout@v2
-      - name: lint
-        uses: golangci/golangci-lint-action@v2
-        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.
-          version: v1.30
-          # Optional: working directory, useful for monorepos
-          # working-directory: somedir
-          # Optional: golangci-lint command line arguments.
-          # args: --issues-exit-code=0
-          # Optional: show only new issues if it's a pull request. The default value is `false`.
-          # only-new-issues: true

.github/workflows/job_coverage.yml

@@ -0,0 +1,53 @@
+name: coverage
+
+on:
+  push:
+    branches: [ main, v3, v4 ]
+    paths-ignore:
+      - '.github/**'
+      - '.gitea/**'
+  pull_request:
+    branches: [ main, v3, v4 ]
+
+jobs:
+
+  build:
+    if: github.server_url != 'https://github.com'
+    runs-on: ubuntu-latest
+    steps:
+    - name: checkout code
+      uses: actions/checkout@v4
+      with:
+        filter: 'blob:none'
+
+    - name: setup go
+      uses: actions/setup-go@v5
+      with:
+        cache-dependency-path: "**/*.sum"
+        go-version: 'stable'
+
+    - name: test coverage
+      run: |
+        go test -v -cover ./... -covermode=count -coverprofile coverage.out -coverpkg ./...
+        go tool cover -func coverage.out -o coverage.out
+
+    - name: coverage badge
+      uses: tj-actions/coverage-badge-go@v2
+      with:
+        green: 80
+        filename: coverage.out
+
+    - uses: stefanzweifel/git-auto-commit-action@v4
+      name: autocommit
+      with:
+        commit_message: Apply Code Coverage Badge
+        skip_fetch: false
+        skip_checkout: false
+        file_pattern: ./README.md
+
+    - name: push
+      if: steps.auto-commit-action.outputs.changes_detected == 'true'
+      uses: ad-m/github-push-action@master
+      with:
+        github_token: ${{ github.token }}
+        branch: ${{ github.ref }}

.github/workflows/job_lint.yml

@@ -0,0 +1,29 @@
+name: lint
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+    branches: [ master, v3, v4 ]
+    paths-ignore:
+      - '.github/**'
+      - '.gitea/**'
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+    - name: checkout code
+      uses: actions/checkout@v4
+      with:
+        filter: 'blob:none'
+    - name: setup go
+      uses: actions/setup-go@v5
+      with:
+        cache-dependency-path: "**/*.sum"
+        go-version: 'stable'
+    - name: setup deps
+      run: go get -v ./...
+    - name: run lint
+      uses: golangci/golangci-lint-action@v6
+      with:
+        version: 'latest'

.github/workflows/job_sync.yml

@@ -0,0 +1,52 @@
+name: sync
+
+on:
+  schedule:
+    - cron: '*/5 * * * *'
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  sync:
+    if: github.server_url != 'https://github.com'
+    runs-on: ubuntu-latest
+    steps:
+    - name: init
+      run: |
+        git config --global user.email "vtolstov <vtolstov@users.noreply.github.com>"
+        git config --global user.name "github-actions[bot]"
+        echo "machine git.unistack.org login vtolstov password ${{ secrets.TOKEN_GITEA }}" >> /root/.netrc
+        echo "machine github.com login vtolstov password ${{ secrets.TOKEN_GITHUB }}" >> /root/.netrc
+
+    - name: sync master
+      run: |
+        git clone --filter=blob:none --filter=tree:0 --branch master --single-branch ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} repo
+        cd repo
+        git remote add --no-tags --fetch --track master upstream https://github.com/${GITHUB_REPOSITORY}
+        git pull --rebase upstream master
+        git push upstream master --progress
+        git push origin master --progress
+        cd ../
+        rm -rf repo
+
+    - name: sync v3
+      run: |
+        git clone --filter=blob:none --filter=tree:0 --branch v3 --single-branch ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} repo
+        cd repo
+        git remote add --no-tags --fetch --track v3 upstream https://github.com/${GITHUB_REPOSITORY}
+        git pull --rebase upstream v3
+        git push upstream v3 --progress
+        git push origin v3 --progress
+        cd ../
+        rm -rf repo
+
+    - name: sync v4
+      run: |
+        git clone --filter=blob:none --filter=tree:0 --branch v4 --single-branch ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} repo
+        cd repo
+        git remote add --no-tags --fetch --track v4 upstream https://github.com/${GITHUB_REPOSITORY}
+        git pull --rebase upstream v4
+        git push upstream v4 --progress
+        git push origin v4 --progress
+        cd ../
+        rm -rf repo

.github/workflows/job_test.yml

@@ -0,0 +1,31 @@
+name: test
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+    branches: [ master, v3, v4 ]
+  push:
+    branches: [ master, v3, v4 ]
+    paths-ignore:
+      - '.github/**'
+      - '.gitea/**'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - name: checkout code
+      uses: actions/checkout@v4
+      with:
+        filter: 'blob:none'
+    - name: setup go
+      uses: actions/setup-go@v5
+      with:
+        cache-dependency-path: "**/*.sum"
+        go-version: 'stable'
+    - name: setup deps
+      run: go get -v ./...
+    - name: run test
+      env:
+        INTEGRATION_TESTS: yes
+      run: go test -mod readonly -v ./...

.github/workflows/job_tests.yml

@@ -0,0 +1,50 @@
+name: test
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+    branches: [ master, v3, v4 ]
+  push:
+    branches: [ master, v3, v4 ]
+    paths-ignore:
+      - '.github/**'
+      - '.gitea/**'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - name: checkout code
+      uses: actions/checkout@v4
+      with:
+        filter: 'blob:none'
+    - name: checkout tests
+      uses: actions/checkout@v4
+      with:
+        ref: master
+        filter: 'blob:none'
+        repository: unistack-org/micro-tests
+        path: micro-tests
+    - name: setup go
+      uses: actions/setup-go@v5
+      with:
+        cache-dependency-path: "**/*.sum"
+        go-version: 'stable'
+    - name: setup go work
+      env:
+        GOWORK: ${{ github.workspace }}/go.work
+      run: |
+        go work init
+        go work use .
+        go work use micro-tests
+    - name: setup deps
+      env:
+        GOWORK: ${{ github.workspace }}/go.work
+      run: go get -v ./...
+    - name: run tests
+      env:
+        INTEGRATION_TESTS: yes
+        GOWORK: ${{ github.workspace }}/go.work
+      run: |
+        cd micro-tests
+        go test -mod readonly -v ./... || true

.github/workflows/pr.yml

@@ -1,46 +0,0 @@
-name: prbuild
-on:
-  pull_request:
-    branches:
-    - master
-jobs:
-  test:
-    name: test
-    runs-on: ubuntu-latest
-    steps:
-    - name: setup
-      uses: actions/setup-go@v2
-      with:
-        go-version: 1.16
-    - name: checkout
-      uses: actions/checkout@v2
-    - name: cache
-      uses: actions/cache@v2
-      with:
-        path: ~/go/pkg/mod
-        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-        restore-keys: ${{ runner.os }}-go-
-    - name: deps
-      run: go get -v -t -d ./...
-    - name: test
-      env:
-        INTEGRATION_TESTS: yes
-      run: go test -mod readonly -v ./...
-  lint:
-    name: lint
-    runs-on: ubuntu-latest
-    steps:
-      - name: checkout
-        uses: actions/checkout@v2
-      - name: lint
-        uses: golangci/golangci-lint-action@v2
-        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.
-          version: v1.30
-          # Optional: working directory, useful for monorepos
-          # working-directory: somedir
-          # Optional: golangci-lint command line arguments.
-          # args: --issues-exit-code=0
-          # Optional: show only new issues if it's a pull request. The default value is `false`.
-          # only-new-issues: true

.golangci.yml

@@ -0,0 +1,5 @@
+run:
+  concurrency: 8
+  timeout: 5m
+  issues-exit-code: 1
+  tests: true

env.go

@@ -2,19 +2,19 @@ package env
 
 import (
 	"context"
+	"fmt"
 	"os"
 	"reflect"
 	"strconv"
 	"strings"
+	"time"
 
-	"github.com/imdario/mergo"
-	"github.com/unistack-org/micro/v3/config"
-	rutil "github.com/unistack-org/micro/v3/util/reflect"
+	"dario.cat/mergo"
+	"go.unistack.org/micro/v4/config"
+	rutil "go.unistack.org/micro/v4/util/reflect"
 )
 
-var (
-	DefaultStructTag = "env"
-)
+var DefaultStructTag = "env"
 
 type envConfig struct {
 	opts config.Options
@@ -28,38 +28,62 @@ func (c *envConfig) Init(opts ...config.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 {
-			return err
+func (c *envConfig) Load(ctx context.Context, opts ...config.LoadOption) 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}
+	tt := timeTransformer{override: options.Override}
+	mopts = append(mopts, mergo.WithTransformers(tt))
+	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 := rutil.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()
@@ -73,10 +97,10 @@ 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)
@@ -86,7 +110,7 @@ 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)
@@ -122,7 +146,7 @@ func (c *envConfig) fillValue(ctx context.Context, value reflect.Value, val stri
 		if err != nil {
 			return err
 		}
-		value.Set(reflect.ValueOf(v))
+		value.Set(reflect.ValueOf(int8(v)))
 	case reflect.Int16:
 		v, err := strconv.ParseInt(val, 10, 16)
 		if err != nil {
@@ -136,6 +160,14 @@ func (c *envConfig) fillValue(ctx context.Context, value reflect.Value, val stri
 		}
 		value.Set(reflect.ValueOf(int32(v)))
 	case reflect.Int64:
+		if value.Type() == reflect.TypeOf(time.Duration(0)) {
+			d, err := time.ParseDuration(val)
+			if err != nil {
+				return fmt.Errorf("cannot parse duration %q: %w", val, err)
+			}
+			value.SetInt(int64(d))
+			return nil
+		}
 		v, err := strconv.ParseInt(val, 10, 64)
 		if err != nil {
 			return err
@@ -175,7 +207,7 @@ 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 {
@@ -193,20 +225,107 @@ func (c *envConfig) fillValues(ctx context.Context, valueOf reflect.Value) error
 	for idx := 0; idx < fields.NumField(); idx++ {
 		field := fields.Field(idx)
 		value := values.Field(idx)
-		if !value.CanSet() {
+		if rutil.IsZero(value) {
 			continue
 		}
-		if len(field.PkgPath) != 0 {
+		if !field.IsExported() {
 			continue
 		}
 		switch value.Kind() {
 		case reflect.Struct:
-			value.Set(reflect.Indirect(reflect.New(value.Type())))
-			if err := c.fillValues(ctx, value); err != nil {
+			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 getEnvValue(field reflect.StructField, structTag string) (string, bool) {
+	tags, ok := field.Tag.Lookup(structTag)
+	if !ok {
+		return "", false
+	}
+	var val string
+	for _, tag := range strings.Split(tags, ",") {
+		if v, ok := os.LookupEnv(tag); ok {
+			val = v
+		}
+	}
+	return val, len(val) > 0
+}
+
+func fillValues(ctx context.Context, valueOf reflect.Value, structTag string) 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)
+		if !field.IsExported() {
+			continue
+		}
+		value := values.Field(idx)
+		if !value.CanSet() {
+			continue
+		}
+
+		switch value.Kind() {
+		case reflect.Struct:
+			if value.Type() == reflect.TypeOf(time.Time{}) {
+				if eval, ok := getEnvValue(field, structTag); ok {
+					parsed, err := time.Parse(time.RFC3339, eval)
+					if err != nil {
+						return fmt.Errorf("cannot parse time.Time %q: %w", eval, err)
+					}
+					value.Set(reflect.ValueOf(parsed))
+				}
+				continue
+			}
+			value.Set(reflect.Indirect(reflect.New(value.Type())))
+			if err := fillValues(ctx, value, structTag); err != nil {
+				return err
+			}
+			continue
+		case reflect.Ptr:
+			if value.Type().Elem() == reflect.TypeOf(time.Time{}) {
+				if eval, ok := getEnvValue(field, structTag); ok {
+					parsed, err := time.Parse(time.RFC3339, eval)
+					if err != nil {
+						return fmt.Errorf("cannot parse *time.Time %q: %w", eval, err)
+					}
+					value.Set(reflect.ValueOf(&parsed))
+				}
+				continue
+			}
 			if value.IsNil() {
 				if value.Type().Elem().Kind() != reflect.Struct {
 					// nil pointer to a non-struct: leave it alone
@@ -215,40 +334,43 @@ func (c *envConfig) fillValues(ctx context.Context, valueOf reflect.Value) error
 				// nil pointer to struct: create a zero instance
 				value.Set(reflect.New(value.Type().Elem()))
 			}
-			value = value.Elem()
-			if err := c.fillValues(ctx, value); err != nil {
+			if err := fillValues(ctx, value.Elem(), structTag); err != nil {
 				return err
 			}
 			continue
-		}
-		tag, ok := field.Tag.Lookup(c.opts.StructTag)
-		if !ok {
-			continue
-		}
-		val, ok := os.LookupEnv(tag)
-		if !ok {
-			continue
-		}
-
-		if err := c.fillValue(ctx, value, val); err != nil {
-			return err
+		default:
+			if eval, ok := getEnvValue(field, structTag); ok {
+				if err := fillValue(ctx, value, eval); err != nil {
+					return err
+				}
+			}
 		}
 	}
-
 	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 ...config.SaveOption) 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 {
-			return err
-		}
+	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
@@ -262,6 +384,20 @@ func (c *envConfig) Name() string {
 	return c.opts.Name
 }
 
+func (c *envConfig) Watch(ctx context.Context, opts ...config.WatchOption) (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 ...config.Option) config.Config {
 	options := config.NewOptions(opts...)
 	if len(options.StructTag) == 0 {
@@ -269,3 +405,38 @@ func NewConfig(opts ...config.Option) config.Config {
 	}
 	return &envConfig{opts: options}
 }
+
+type timeTransformer struct {
+	override bool
+}
+
+func (t timeTransformer) Transformer(typ reflect.Type) func(dst, src reflect.Value) error {
+	if typ == reflect.TypeOf(time.Time{}) {
+		return func(dst, src reflect.Value) error {
+			if !dst.CanSet() || src.IsZero() {
+				return nil
+			}
+			if !t.override && !dst.IsZero() {
+				return nil
+			}
+			dst.Set(src)
+			return nil
+		}
+	}
+	if typ == reflect.TypeOf((*time.Time)(nil)) {
+		return func(dst, src reflect.Value) error {
+			if !dst.CanSet() || src.IsNil() {
+				return nil
+			}
+			if src.Elem().IsZero() {
+				return nil
+			}
+			if !t.override && !dst.IsNil() && !dst.Elem().IsZero() {
+				return nil
+			}
+			dst.Set(src)
+			return nil
+		}
+	}
+	return nil
+}

env_test.go

@@ -1,16 +1,18 @@
-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"
+	"github.com/stretchr/testify/require"
+	"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 +20,81 @@ 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 +109,7 @@ 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 +132,443 @@ 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)
+		}
+	}
+}
+
+func TestEnv_SupportedTypes(t *testing.T) {
+	type Config struct {
+		IntValue   int   `env:"INT_VALUE"`
+		Int8Value  int8  `env:"INT8_VALUE"`
+		Int16Value int16 `env:"INT16_VALUE"`
+		Int32Value int32 `env:"INT32_VALUE"`
+		Int64Value int64 `env:"INT64_VALUE"`
+
+		UintValue   uint   `env:"UINT_VALUE"`
+		Uint8Value  uint8  `env:"UINT8_VALUE"`
+		Uint16Value uint16 `env:"UINT16_VALUE"`
+		Uint32Value uint32 `env:"UINT32_VALUE"`
+		Uint64Value uint64 `env:"UINT64_VALUE"`
+
+		Float32Value float32 `env:"FLOAT32_VALUE"`
+		Float64Value float64 `env:"FLOAT64_VALUE"`
+
+		BoolValue bool `env:"BOOL_VALUE"`
+
+		StringValue string `env:"STRING_VALUE"`
+
+		StringSlice []string `env:"STRING_SLICE"`
+		IntSlice    []int    `env:"INT_SLICE"`
+
+		MapStringValue map[string]string `env:"MAP_STRING"`
+		MapIntValue    map[string]int    `env:"MAP_INT"`
+
+		DurationValue time.Duration `env:"DURATION_VALUE"`
+		TimeValue     time.Time     `env:"TIME_VALUE"`
+		TimePtrValue  *time.Time    `env:"TIME_PTR_VALUE"`
+	}
+
+	tests := []struct {
+		name   string
+		envVar string
+		envVal string
+		want   func() *Config
+	}{
+		// integers
+		{
+			name:   "int type",
+			envVar: "INT_VALUE",
+			envVal: "100",
+			want:   func() *Config { return &Config{IntValue: 100} },
+		},
+		{
+			name:   "int8 type",
+			envVar: "INT8_VALUE",
+			envVal: "127",
+			want:   func() *Config { return &Config{Int8Value: 127} },
+		},
+		{
+			name:   "int16 type",
+			envVar: "INT16_VALUE",
+			envVal: "32767",
+			want:   func() *Config { return &Config{Int16Value: 32767} },
+		},
+		{
+			name:   "int32 type",
+			envVar: "INT32_VALUE",
+			envVal: "2147483647",
+			want:   func() *Config { return &Config{Int32Value: 2147483647} },
+		},
+		{
+			name:   "int64 type",
+			envVar: "INT64_VALUE",
+			envVal: "9223372036854775807",
+			want:   func() *Config { return &Config{Int64Value: 9223372036854775807} },
+		},
+		// unsigned integers
+		{
+			name:   "uint type",
+			envVar: "UINT_VALUE",
+			envVal: "100",
+			want:   func() *Config { return &Config{UintValue: 100} },
+		},
+		{
+			name:   "uint8 type",
+			envVar: "UINT8_VALUE",
+			envVal: "255",
+			want:   func() *Config { return &Config{Uint8Value: 255} },
+		},
+		{
+			name:   "uint16 type",
+			envVar: "UINT16_VALUE",
+			envVal: "65535",
+			want:   func() *Config { return &Config{Uint16Value: 65535} },
+		},
+		{
+			name:   "uint32 type",
+			envVar: "UINT32_VALUE",
+			envVal: "4294967295",
+			want:   func() *Config { return &Config{Uint32Value: 4294967295} },
+		},
+		{
+			name:   "uint64 type",
+			envVar: "UINT64_VALUE",
+			envVal: "18446744073709551615",
+			want:   func() *Config { return &Config{Uint64Value: 18446744073709551615} },
+		},
+		// floats
+		{
+			name:   "float32 type",
+			envVar: "FLOAT32_VALUE",
+			envVal: "3.14159",
+			want:   func() *Config { return &Config{Float32Value: 3.14159} },
+		},
+		{
+			name:   "float64 type",
+			envVar: "FLOAT64_VALUE",
+			envVal: "3.141592653589793",
+			want:   func() *Config { return &Config{Float64Value: 3.141592653589793} },
+		},
+		// bool
+		{
+			name:   "bool true",
+			envVar: "BOOL_VALUE",
+			envVal: "true",
+			want:   func() *Config { return &Config{BoolValue: true} },
+		},
+		{
+			name:   "bool false",
+			envVar: "BOOL_VALUE",
+			envVal: "false",
+			want:   func() *Config { return &Config{BoolValue: false} },
+		},
+		{
+			name:   "bool 1",
+			envVar: "BOOL_VALUE",
+			envVal: "1",
+			want:   func() *Config { return &Config{BoolValue: true} },
+		},
+		{
+			name:   "bool 0",
+			envVar: "BOOL_VALUE",
+			envVal: "0",
+			want:   func() *Config { return &Config{BoolValue: false} },
+		},
+		// string
+		{
+			name:   "string type",
+			envVar: "STRING_VALUE",
+			envVal: "hello world",
+			want:   func() *Config { return &Config{StringValue: "hello world"} },
+		},
+		// slices
+		{
+			name:   "string slice comma separated",
+			envVar: "STRING_SLICE",
+			envVal: "val1,val2,val3",
+			want:   func() *Config { return &Config{StringSlice: []string{"val1", "val2", "val3"}} },
+		},
+		{
+			name:   "string slice semicolon separated",
+			envVar: "STRING_SLICE",
+			envVal: "val1;val2;val3",
+			want:   func() *Config { return &Config{StringSlice: []string{"val1", "val2", "val3"}} },
+		},
+		{
+			name:   "int slice comma separated",
+			envVar: "INT_SLICE",
+			envVal: "1,2,3,4,5",
+			want:   func() *Config { return &Config{IntSlice: []int{1, 2, 3, 4, 5}} },
+		},
+		{
+			name:   "int slice semicolon separated",
+			envVar: "INT_SLICE",
+			envVal: "1;2;3;4;5",
+			want:   func() *Config { return &Config{IntSlice: []int{1, 2, 3, 4, 5}} },
+		},
+		// maps
+		{
+			name:   "string map",
+			envVar: "MAP_STRING",
+			envVal: "key1=val1,key2=val2",
+			want: func() *Config {
+				return &Config{MapStringValue: map[string]string{"key1": "val1", "key2": "val2"}}
+			},
+		},
+		{
+			name:   "int map",
+			envVar: "MAP_INT",
+			envVal: "key1=1,key2=2",
+			want: func() *Config {
+				return &Config{MapIntValue: map[string]int{"key1": 1, "key2": 2}}
+			},
+		},
+		// time && duration
+		{
+			name:   "duration type",
+			envVar: "DURATION_VALUE",
+			envVal: "15m30s",
+			want:   func() *Config { return &Config{DurationValue: 15*time.Minute + 30*time.Second} },
+		},
+		{
+			name:   "time type RFC3339",
+			envVar: "TIME_VALUE",
+			envVal: "2025-08-28T15:04:05Z",
+			want: func() *Config {
+				return &Config{TimeValue: time.Date(2025, 8, 28, 15, 4, 5, 0, time.UTC)}
+			},
+		},
+		{
+			name:   "time type RFC3339",
+			envVar: "TIME_PTR_VALUE",
+			envVal: "2025-08-28T15:04:05Z",
+			want: func() *Config {
+				timeValue := time.Date(2025, 8, 28, 15, 4, 5, 0, time.UTC)
+				return &Config{TimePtrValue: &timeValue}
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			require.NoError(t, os.Setenv(tt.envVar, tt.envVal))
+			defer os.Unsetenv(tt.envVar)
+
+			cfgData := &Config{}
+			cfg := NewConfig(config.Struct(cfgData))
+
+			require.NoError(t, cfg.Init())
+			require.NoError(t, cfg.Load(context.Background()))
+
+			require.Equal(t, tt.want(), cfgData)
+		})
+	}
+}
+
+func TestEnv_TimeType_Override(t *testing.T) {
+	type Config struct {
+		TimeValue time.Time `env:"TIME"`
+	}
+
+	tests := []struct {
+		name   string
+		cfg    *Config
+		envVar string
+		envVal string
+		want   *Config
+	}{
+		{
+			name:   "init value is empty",
+			cfg:    &Config{},
+			envVar: "TIME",
+			envVal: "2025-08-28T15:04:05Z",
+			want: &Config{
+				TimeValue: time.Date(2025, 8, 28, 15, 4, 5, 0, time.UTC),
+			},
+		},
+		{
+			name: "init value is not empty",
+			cfg: &Config{
+				TimeValue: time.Date(2025, 5, 25, 15, 5, 5, 5, time.UTC),
+			},
+			envVar: "TIME",
+			envVal: "2025-08-28T15:04:05Z",
+			want: &Config{
+				TimeValue: time.Date(2025, 8, 28, 15, 4, 5, 0, time.UTC),
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			require.NoError(t, os.Setenv(tt.envVar, tt.envVal))
+			defer os.Unsetenv(tt.envVar)
+
+			cfg := NewConfig(config.Struct(tt.cfg))
+			require.NoError(t, cfg.Init())
+			require.NoError(t, cfg.Load(context.Background(), config.LoadOverride(true)))
+			require.Equal(t, tt.want, tt.cfg)
+		})
+	}
+}
+
+func TestEnv_TimePointerType_Override(t *testing.T) {
+	type Config struct {
+		TimeValue *time.Time `env:"TIME"`
+	}
+
+	tests := []struct {
+		name   string
+		cfg    func() *Config
+		envVar string
+		envVal string
+		want   func() *Config
+	}{
+		{
+			name:   "init value is empty",
+			cfg:    func() *Config { return &Config{} },
+			envVar: "TIME",
+			envVal: "2025-08-28T15:04:05Z",
+			want: func() *Config {
+				timeValue := time.Date(2025, 8, 28, 15, 4, 5, 0, time.UTC)
+				return &Config{
+					TimeValue: &timeValue,
+				}
+			},
+		},
+		{
+			name: "init value is not empty",
+			cfg: func() *Config {
+				timeValue := time.Date(2025, 5, 25, 15, 5, 5, 5, time.UTC)
+				return &Config{
+					TimeValue: &timeValue,
+				}
+			},
+			envVar: "TIME",
+			envVal: "2025-08-28T15:04:05Z",
+			want: func() *Config {
+				timeValue := time.Date(2025, 8, 28, 15, 4, 5, 0, time.UTC)
+				return &Config{
+					TimeValue: &timeValue,
+				}
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			require.NoError(t, os.Setenv(tt.envVar, tt.envVal))
+			defer os.Unsetenv(tt.envVar)
+
+			cfgData := tt.cfg()
+			cfg := NewConfig(config.Struct(cfgData))
+			require.NoError(t, cfg.Init())
+			require.NoError(t, cfg.Load(context.Background(), config.LoadOverride(true)))
+			require.Equal(t, tt.want(), cfgData)
+		})
+	}
 }

go.mod

@@ -1,8 +1,27 @@
-module github.com/unistack-org/micro-config-env/v3
+module go.unistack.org/micro-config-env/v4
 
-go 1.15
+go 1.22.0
+
+toolchain go1.24.1
 
 require (
-	github.com/imdario/mergo v0.3.12
-	github.com/unistack-org/micro/v3 v3.3.10
+	dario.cat/mergo v1.0.1
+	go.unistack.org/micro/v4 v4.1.3
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+)
+
+require (
+	github.com/ash3in/uuidv8 v1.2.0 // indirect
+	github.com/google/go-cmp v0.6.0 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/matoous/go-nanoid v1.5.1 // indirect
+	github.com/spf13/cast v1.7.1 // indirect
+	github.com/stretchr/testify v1.11.1
+	go.unistack.org/micro-proto/v4 v4.1.0 // indirect
+	google.golang.org/protobuf v1.36.5 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,177 +1,39 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
-github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
-github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
-github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumCAMpl/TFQ4/5kLM=
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-github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
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-github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
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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
+}