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-#go get github.com/psampaz/go-mod-outdated@v0.6.0
-go list -u -m -mod=mod -json all | go-mod-outdated -update -direct -ci || true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-#go list -u -m -json all | go-mod-outdated -update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.

.golangci.yml

@@ -0,0 +1,44 @@
+run:
+  concurrency: 4
+  deadline: 5m
+  issues-exit-code: 1
+  tests: true
+
+linters-settings:
+  govet:
+    check-shadowing: true
+    enable:
+      - fieldalignment
+
+linters:
+  enable:
+    - govet
+    - deadcode
+    - errcheck
+    - govet
+    - ineffassign
+    - staticcheck
+    - structcheck
+    - typecheck
+    - unused
+    - varcheck
+    - bodyclose
+    - gci
+    - goconst
+    - gocritic
+    - gosimple
+    - gofmt
+    - gofumpt
+    - goimports
+    - golint
+    - gosec
+    - makezero
+    - misspell
+    - nakedret
+    - nestif
+    - nilerr
+    - noctx
+    - prealloc
+    - unconvert
+    - unparam
+  disable-all: false

go.mod

@@ -1,13 +1,37 @@
-module github.com/unistack-org/micro-config-vault/v3
+module go.unistack.org/micro-config-vault/v4
 
-go 1.15
+go 1.20
 
 require (
-	github.com/hashicorp/go-multierror v1.1.0 // indirect
+	dario.cat/mergo v1.0.0
-	github.com/hashicorp/go-rootcerts v1.0.2 // indirect
+	github.com/hashicorp/vault/api v1.12.0
-	github.com/hashicorp/vault/api v1.0.4
+	go.unistack.org/micro/v4 v4.0.17
-	github.com/imdario/mergo v0.3.11
+)
-	github.com/unistack-org/micro/v3 v3.2.4
+
-	golang.org/x/time v0.0.0-20190921001708-c4c64cad1fd0 // indirect
+require (
-	gopkg.in/square/go-jose.v2 v2.4.1 // indirect
+	github.com/cenkalti/backoff/v3 v3.2.2 // indirect
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/fatih/color v1.14.1 // indirect
+	github.com/go-jose/go-jose/v3 v3.0.2 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/hashicorp/errwrap v1.1.0 // indirect
+	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
+	github.com/hashicorp/go-hclog v1.6.2 // indirect
+	github.com/hashicorp/go-multierror v1.1.1 // indirect
+	github.com/hashicorp/go-retryablehttp v0.7.5 // indirect
+	github.com/hashicorp/go-rootcerts v1.0.2 // indirect
+	github.com/hashicorp/go-secure-stdlib/parseutil v0.1.8 // indirect
+	github.com/hashicorp/go-secure-stdlib/strutil v0.1.2 // indirect
+	github.com/hashicorp/go-sockaddr v1.0.6 // indirect
+	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-isatty v0.0.17 // indirect
+	github.com/mitchellh/go-homedir v1.1.0 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+	github.com/ryanuber/go-glob v1.0.0 // indirect
+	golang.org/x/crypto v0.21.0 // indirect
+	golang.org/x/net v0.22.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
+	golang.org/x/time v0.5.0 // indirect
 )

go.sum

@@ -1,208 +1,123 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+dario.cat/mergo v1.0.0 h1:AGCNq9Evsj31mOgNPcLyXc+4PNABt905YmuqPYYpBWk=
-github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
+dario.cat/mergo v1.0.0/go.mod h1:uNxQE+84aUszobStD9th8a29P2fMDhsBdgRYvZOxGmk=
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/cenkalti/backoff/v3 v3.2.2 h1:cfUAAO3yvKMYKPrvhDuHSwQnhZNk/RMHKdZqKTxfm6M=
-github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da h1:8GUt8eRujhVEGZFFEjBj46YV4rDjvGrNxb0KMWYkL2I=
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-github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
-github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
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-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/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
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options.go

@@ -1,42 +1,57 @@
 package vault
 
 import (
+	"net/http"
+	"time"
+
 	"github.com/hashicorp/vault/api"
-	"github.com/unistack-org/micro/v3/config"
+	"go.unistack.org/micro/v4/options"
 )
 
+type httpClientKey struct{}
+
+func HTTPClient(c *http.Client) options.Option {
+	return options.ContextOption(httpClientKey{}, c)
+}
+
 type configKey struct{}
 
-func Config(cfg *api.Config) config.Option {
+func Config(cfg *api.Config) options.Option {
-	return config.SetOption(configKey{}, cfg)
+	return options.ContextOption(configKey{}, cfg)
 }
 
 type tokenKey struct{}
 
-func Token(token string) config.Option {
+func Token(token string) options.Option {
-	return config.SetOption(tokenKey{}, token)
+	return options.ContextOption(tokenKey{}, token)
 }
 
 type addrKey struct{}
 
-func Address(addr string) config.Option {
+func Address(addr string) options.Option {
-	return config.SetOption(addrKey{}, addr)
+	return options.ContextOption(addrKey{}, addr)
 }
 
 type pathKey struct{}
 
-func Path(path string) config.Option {
+func Path(path string) options.Option {
-	return config.SetOption(pathKey{}, path)
+	return options.ContextOption(pathKey{}, path)
 }
 
 type roleIDKey struct{}
 
-func RoleID(role string) config.Option {
+func RoleID(role string) options.Option {
-	return config.SetOption(roleIDKey{}, role)
+	return options.ContextOption(roleIDKey{}, role)
 }
 
 type secretIDKey struct{}
 
-func SecretID(secret string) config.Option {
+func SecretID(secret string) options.Option {
-	return config.SetOption(secretIDKey{}, secret)
+	return options.ContextOption(secretIDKey{}, secret)
+}
+
+type timeoutKey struct{}
+
+func Timeout(td time.Duration) options.Option {
+	return options.ContextOption(timeoutKey{}, td)
 }

vault.go

@@ -3,39 +3,45 @@ package vault
 import (
 	"context"
 	"encoding/json"
-	"errors"
+	"fmt"
+	"net/http"
+	"time"
 
+	"dario.cat/mergo"
 	"github.com/hashicorp/vault/api"
-	"github.com/imdario/mergo"
+	"go.unistack.org/micro/v4/config"
-	"github.com/unistack-org/micro/v3/config"
+	"go.unistack.org/micro/v4/options"
-	rutil "github.com/unistack-org/micro/v3/util/reflect"
+	rutil "go.unistack.org/micro/v4/util/reflect"
 )
 
-var (
+var DefaultStructTag = "vault"
-	DefaultStructTag = "vault"
-	ErrPathNotExist  = errors.New("path is not exist")
-)
 
 type vaultConfig struct {
-	opts config.Options
-	cli  *api.Client
 	path string
+	cli  *api.Client
+	opts config.Options
 }
 
 func (c *vaultConfig) Options() config.Options {
 	return c.opts
 }
 
-func (c *vaultConfig) Init(opts ...config.Option) error {
+func (c *vaultConfig) 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 c.opts.Codec == nil {
 		return config.ErrCodecMissing
 	}
 
 	cfg := api.DefaultConfig()
+	cfg.Timeout = 500 * time.Millisecond
+	cfg.MaxRetries = 2
 	path := ""
 	token := ""
 	roleID := ""
@@ -46,6 +52,14 @@ func (c *vaultConfig) Init(opts ...config.Option) error {
 			cfg = v
 		}
 
+		if v, ok := c.opts.Context.Value(httpClientKey{}).(*http.Client); ok {
+			cfg.HttpClient = v
+		}
+
+		if v, ok := c.opts.Context.Value(timeoutKey{}).(time.Duration); ok {
+			cfg.Timeout = v
+		}
+
 		if v, ok := c.opts.Context.Value(addrKey{}).(string); ok {
 			cfg.Address = v
 		}
@@ -70,78 +84,149 @@ func (c *vaultConfig) Init(opts ...config.Option) error {
 
 	cli, err := api.NewClient(cfg)
 	if err != nil {
-		return err
+		if !c.opts.AllowFail {
-	}
-
-	if len(token) == 0 {
-		rsp, err := cli.Logical().Write("auth/approle/login", map[string]interface{}{
-			"role_id":   roleID,
-			"secret_id": secretID,
-		})
-		if err != nil {
 			return err
 		}
-		token = rsp.Auth.ClientToken
-	}
-	cli.SetToken(token)
 
+		if err = config.DefaultAfterInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
+			return err
+		}
+
+		return nil
+	}
 	c.cli = cli
 	c.path = path
 
+	if token != "" {
+		cli.SetToken(token)
+
+		if err := config.DefaultAfterInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
+			return err
+		}
+
+		return nil
+
+	} else if roleID == "" || secretID == "" {
+		if !c.opts.AllowFail {
+			return fmt.Errorf("missing Token or RoleID and SecretID")
+		}
+
+		if err := config.DefaultAfterInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
+			return err
+		}
+
+		return nil
+	}
+
+	rsp, err := cli.Logical().Write("auth/approle/login", map[string]interface{}{
+		"role_id":   roleID,
+		"secret_id": secretID,
+	})
+
+	if err != nil {
+		if !c.opts.AllowFail {
+			return err
+		}
+	} else if err == nil {
+		cli.SetToken(rsp.Auth.ClientToken)
+	}
+
+	if err := config.DefaultAfterInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
+		return err
+	}
+
 	return nil
 }
 
-func (c *vaultConfig) Load(ctx context.Context) error {
+func (c *vaultConfig) Load(ctx context.Context, opts ...options.Option) error {
-	for _, fn := range c.opts.BeforeLoad {
+	if err := config.DefaultBeforeLoad(ctx, c); err != nil {
-		if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
+		return err
-			return err
+	}
+
+	options := config.NewLoadOptions(opts...)
+	if c.cli == nil {
+		c.opts.Logger.Error(c.opts.Context, fmt.Sprintf("vault load err: %v", "vault client not created"))
+		if !c.opts.AllowFail {
+			return fmt.Errorf("vault client not created")
 		}
+		return config.DefaultAfterLoad(ctx, c)
 	}
 
 	pair, err := c.cli.Logical().Read(c.path)
-	if err != nil && !c.opts.AllowFail {
+	if err != nil {
+		err = fmt.Errorf("vault load path %s err: %w", c.path, err)
+		if !c.opts.AllowFail {
+			return err
+		}
+		return config.DefaultAfterLoad(ctx, c)
+	}
+
+	if pair == nil || pair.Data == nil {
+		err = fmt.Errorf("vault load path %s err: %w", c.path, fmt.Errorf("not found"))
+		if !c.opts.AllowFail {
+			return err
+		}
+		return config.DefaultAfterLoad(ctx, c)
+	}
+
+	var data []byte
+	var src interface{}
+	data, err = json.Marshal(pair.Data["data"])
+	if err != nil {
+		err = fmt.Errorf("vault load path %s err: %w", c.path, err)
+		if !c.opts.AllowFail {
+			return err
+		}
+		return config.DefaultAfterLoad(ctx, c)
+	}
+
+	dst := c.opts.Struct
+	if options.Struct != nil {
+		dst = options.Struct
+	}
+
+	src, err = rutil.Zero(dst)
+	if err == nil {
+		err = c.opts.Codec.Unmarshal(data, src)
+	}
+
+	if err != nil {
+		c.opts.Logger.Error(c.opts.Context, fmt.Sprintf("vault load path %s err: %v", c.path, err))
+		if !c.opts.AllowFail {
+			return err
+		}
+		return config.DefaultAfterLoad(ctx, c)
+	}
+
+	mopts := []func(*mergo.Config){mergo.WithTypeCheck}
+	if options.Override {
+		mopts = append(mopts, mergo.WithOverride)
+	}
+	if options.Append {
+		mopts = append(mopts, mergo.WithAppendSlice)
+	}
+	err = mergo.Merge(dst, src, mopts...)
+	if err != nil {
+		err = fmt.Errorf("vault load path %s err: %w", c.path, err)
+		if !c.opts.AllowFail {
+			return err
+		}
+	}
+
+	if err := config.DefaultAfterLoad(ctx, c); err != nil {
 		return err
-	} else if (pair == nil || pair.Data == nil) && !c.opts.AllowFail {
-		return ErrPathNotExist
-	}
-
-	if err == nil && pair != nil && pair.Data != nil {
-		var data []byte
-		data, err = json.Marshal(pair.Data["data"])
-		if err == nil {
-			src, err := rutil.Zero(c.opts.Struct)
-			if err == nil {
-				err = c.opts.Codec.Unmarshal(data, src)
-				if err == nil {
-					err = mergo.Merge(c.opts.Struct, src, mergo.WithOverride, mergo.WithTypeCheck, mergo.WithAppendSlice)
-				}
-			}
-		}
-		if 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 *vaultConfig) Save(ctx context.Context) error {
+func (c *vaultConfig) Save(ctx context.Context, opts ...options.Option) error {
-	for _, fn := range c.opts.BeforeSave {
+	if err := config.DefaultBeforeSave(ctx, c); err != nil {
-		if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
+		return err
-			return err
-		}
 	}
 
-	for _, fn := range c.opts.AfterSave {
+	if err := config.DefaultAfterSave(ctx, c); err != nil {
-		if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
+		return err
-			return err
-		}
 	}
 
 	return nil
@@ -155,7 +240,23 @@ func (c *vaultConfig) Name() string {
 	return c.opts.Name
 }
 
-func NewConfig(opts ...config.Option) config.Config {
+func (c *vaultConfig) Watch(ctx context.Context, opts ...options.Option) (config.Watcher, error) {
+	w := &vaultWatcher{
+		cli:   c.cli,
+		path:  c.path,
+		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

vault_test.go

@@ -0,0 +1,24 @@
+package vault
+
+import (
+	"context"
+	"testing"
+
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/config"
+	"go.unistack.org/micro/v4/options"
+)
+
+func TestInit(t *testing.T) {
+	c := NewConfig(
+		options.Context(context.TODO()),
+		options.Codec(codec.NewCodec()),
+		config.BeforeInit(func(ctx context.Context, c config.Config) error {
+			return c.Init(Token("tkn"), config.BeforeInit(nil))
+		}),
+	)
+
+	if err := c.Init(); err != nil {
+		t.Fatal(err)
+	}
+}

watcher.go

@@ -0,0 +1,106 @@
+package vault
+
+import (
+	"encoding/json"
+	"fmt"
+	"reflect"
+
+	"github.com/hashicorp/vault/api"
+	"go.unistack.org/micro/v4/config"
+	"go.unistack.org/micro/v4/util/jitter"
+	rutil "go.unistack.org/micro/v4/util/reflect"
+)
+
+type vaultWatcher struct {
+	path  string
+	done  chan struct{}
+	vchan chan map[string]interface{}
+	echan chan error
+	cli   *api.Client
+	opts  config.Options
+	wopts config.WatchOptions
+}
+
+func (w *vaultWatcher) 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 {
+				w.echan <- err
+				return
+			}
+
+			pair, err := w.cli.Logical().Read(w.path)
+			if err != nil {
+				w.echan <- err
+				return
+			} else if pair == nil || pair.Data == nil {
+				w.echan <- fmt.Errorf("vault path %s not found", w.path)
+				return
+			}
+
+			var data []byte
+			data, err = json.Marshal(pair.Data["data"])
+			if err == nil {
+				err = w.opts.Codec.Unmarshal(data, dst)
+			}
+			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 *vaultWatcher) 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 *vaultWatcher) Stop() error {
+	close(w.done)
+	return nil
+}