Merge pull request 'Update workflows' (#97) from atolstikhin/micro-config-file:master into master

Reviewed-on: #97

.gitea/workflows/job_lint.yml

@@ -0,0 +1,29 @@
+name: lint
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+    branches:
+    - master
+    - v3
+    - v4
+
+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: https://github.com/golangci/golangci-lint-action@v6
+      with:
+        version: 'latest'

.gitea/workflows/job_test.yml

@@ -0,0 +1,34 @@
+name: test
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+    branches:
+    - master
+    - v3
+    - v4
+  push:
+    branches:
+    - master
+    - v3
+    - v4
+
+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 ./...

.gitea/workflows/job_tests.yml

@@ -0,0 +1,53 @@
+name: test
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+    branches:
+    - master
+    - v3
+    - v4
+  push:
+    branches:
+    - master
+    - v3
+    - v4
+
+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: /workspace/${{ github.repository_owner }}/go.work
+      run: |
+        go work init
+        go work use .
+        go work use micro-tests        
+    - name: setup deps
+      env:
+        GOWORK: /workspace/${{ github.repository_owner }}/go.work
+      run: go get -v ./...
+    - name: run tests
+      env:
+        INTEGRATION_TESTS: yes
+        GOWORK: /workspace/${{ github.repository_owner }}/go.work
+      run: |
+        cd micro-tests
+        go test -mod readonly -v ./... || true        

.github/dependabot.yml

@@ -1,19 +0,0 @@
-# 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/workflows/autoapprove.yml

@@ -1,20 +0,0 @@
-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

@@ -1,21 +0,0 @@
-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

@@ -1,47 +0,0 @@
-name: build
-on:
- push:
-    branches:
-    - master
-    - v3
-jobs:
-  test:
-    name: test
-    runs-on: ubuntu-latest
-    steps:
-    - name: setup
-      uses: actions/setup-go@v3
-      with:
-        go-version: 1.17
-    - name: checkout
-      uses: actions/checkout@v3
-    - name: cache
-      uses: actions/cache@v3
-      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@v3
-      - name: lint
-        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.
-          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/codeql-analysis.yml

@@ -1,78 +0,0 @@
-# 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

@@ -1,27 +0,0 @@
-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

@@ -1,47 +0,0 @@
-name: prbuild
-on:
-  pull_request:
-    branches:
-    - master
-    - v3
-jobs:
-  test:
-    name: test
-    runs-on: ubuntu-latest
-    steps:
-    - name: setup
-      uses: actions/setup-go@v3
-      with:
-        go-version: 1.17
-    - name: checkout
-      uses: actions/checkout@v3
-    - name: cache
-      uses: actions/cache@v3
-      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@v3
-      - name: lint
-        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.
-          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
+  deadline: 5m
+  issues-exit-code: 1
+  tests: true

file.go

@@ -1,23 +1,27 @@
-package file // import "go.unistack.org/micro-config-file/v4"
+package file
 
 import (
 	"context"
 	"fmt"
 	"io"
 	"os"
+	"regexp"
 
-	"github.com/imdario/mergo"
+	"dario.cat/mergo"
 	"go.unistack.org/micro/v4/codec"
 	"go.unistack.org/micro/v4/config"
 	"go.unistack.org/micro/v4/options"
 	rutil "go.unistack.org/micro/v4/util/reflect"
+	"golang.org/x/text/transform"
 )
 
 var DefaultStructTag = "file"
 
 type fileConfig struct {
-	opts config.Options
-	path string
+	opts        config.Options
+	path        string
+	reader      io.Reader
+	transformer transform.Transformer
 }
 
 func (c *fileConfig) Options() config.Options {
@@ -25,22 +29,36 @@ func (c *fileConfig) Options() config.Options {
 }
 
 func (c *fileConfig) Init(opts ...options.Option) error {
-	if err := config.DefaultBeforeInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
+	var err error
+
+	if err = config.DefaultBeforeInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
 		return err
 	}
 
 	for _, o := range opts {
-		o(&c.opts)
+		if err = o(&c.opts); err != nil {
+			return err
+		}
 	}
 
 	if c.opts.Context != nil {
 		if v, ok := c.opts.Context.Value(pathKey{}).(string); ok {
 			c.path = v
 		}
+		if v, ok := c.opts.Context.Value(transformerKey{}).(transform.Transformer); ok {
+			c.transformer = v
+		}
+		if v, ok := c.opts.Context.Value(readerKey{}).(io.Reader); ok {
+			c.reader = v
+		}
 	}
 
-	if c.path == "" {
-		err := fmt.Errorf("file path not exists: %v", c.path)
+	if c.opts.Codec == nil {
+		return fmt.Errorf("Codec must be specified")
+	}
+
+	if c.path == "" && c.reader == nil {
+		err := fmt.Errorf("Path or Reader must be specified")
 		if !c.opts.AllowFail {
 			return err
 		}
@@ -63,17 +81,40 @@ func (c *fileConfig) Load(ctx context.Context, opts ...options.Option) error {
 	}
 
 	path := c.path
+	transformer := c.transformer
+	reader := c.reader
+
 	options := config.NewLoadOptions(opts...)
 	if options.Context != nil {
 		if v, ok := options.Context.Value(pathKey{}).(string); ok && v != "" {
 			path = v
 		}
+		if v, ok := c.opts.Context.Value(transformerKey{}).(transform.Transformer); ok {
+			transformer = v
+		}
+		if v, ok := c.opts.Context.Value(readerKey{}).(io.Reader); ok {
+			reader = v
+		}
+	}
+
+	var fp io.Reader
+	var err error
+
+	if c.path != "" {
+		fp, err = os.OpenFile(path, os.O_RDONLY, os.FileMode(0o400))
+	} else if c.reader != nil {
+		fp = reader
+	} else {
+		err = fmt.Errorf("Path or Reader must be specified")
 	}
 
-	fp, err := os.OpenFile(path, os.O_RDONLY, os.FileMode(0400))
 	if err != nil {
 		if !c.opts.AllowFail {
-			return fmt.Errorf("file load path %s error: %w", path, err)
+			if c.path != "" {
+				return fmt.Errorf("file load path %s error: %w", path, err)
+			} else {
+				return fmt.Errorf("file load error: %w", err)
+			}
 		}
 		if err = config.DefaultAfterLoad(ctx, c); err != nil && !c.opts.AllowFail {
 			return err
@@ -82,9 +123,18 @@ func (c *fileConfig) Load(ctx context.Context, opts ...options.Option) error {
 		return nil
 	}
 
-	defer fp.Close()
+	if fpc, ok := fp.(io.Closer); ok {
+		defer fpc.Close()
+	}
 
-	buf, err := io.ReadAll(io.LimitReader(fp, int64(codec.DefaultMaxMsgSize)))
+	var r io.Reader
+	if transformer != nil {
+		r = transform.NewReader(fp, c.transformer)
+	} else {
+		r = fp
+	}
+
+	buf, err := io.ReadAll(io.LimitReader(r, int64(codec.DefaultMaxMsgSize)))
 	if err != nil {
 		if !c.opts.AllowFail {
 			return err
@@ -162,7 +212,7 @@ func (c *fileConfig) Save(ctx context.Context, opts ...options.Option) error {
 		return nil
 	}
 
-	fp, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE, os.FileMode(0600))
+	fp, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE, os.FileMode(0o600))
 	if err != nil {
 		if !c.opts.AllowFail {
 			return err
@@ -228,3 +278,82 @@ func NewConfig(opts ...options.Option) config.Config {
 	}
 	return &fileConfig{opts: options}
 }
+
+type EnvTransformer struct {
+	maxMatchSize    int
+	Regexp          *regexp.Regexp
+	TransformerFunc TransformerFunc
+	overflow        []byte
+}
+
+var _ transform.Transformer = (*EnvTransformer)(nil)
+
+// Transform implements golang.org/x/text/transform#Transformer
+func (t *EnvTransformer) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) {
+	t.maxMatchSize = 1024
+	var n int
+	// copy any overflow from the last call
+	if len(t.overflow) > 0 {
+		n, err = fullcopy(dst, t.overflow)
+		nDst += n
+		if err != nil {
+			t.overflow = t.overflow[n:]
+			return
+		}
+		t.overflow = nil
+	}
+	for _, index := range t.Regexp.FindAllSubmatchIndex(src, -1) {
+		// copy everything up to the match
+		n, err = fullcopy(dst[nDst:], src[nSrc:index[0]])
+		nSrc += n
+		nDst += n
+		if err != nil {
+			return
+		}
+		// skip the match if it ends at the end the src buffer.
+		// it could potentially match more
+		if index[1] == len(src) && !atEOF {
+			break
+		}
+		// copy the replacement
+		rep := t.TransformerFunc(src, index)
+		n, err = fullcopy(dst[nDst:], rep)
+		nDst += n
+		nSrc = index[1]
+		if err != nil {
+			t.overflow = rep[n:]
+			return
+		}
+	}
+	// if we're at the end, tack on any remaining bytes
+	if atEOF {
+		n, err = fullcopy(dst[nDst:], src[nSrc:])
+		nDst += n
+		nSrc += n
+		return
+	}
+	// skip any bytes which exceede the max match size
+	if skip := len(src[nSrc:]) - t.maxMatchSize; skip > 0 {
+		n, err = fullcopy(dst[nDst:], src[nSrc:nSrc+skip])
+		nSrc += n
+		nDst += n
+		if err != nil {
+			return
+		}
+	}
+	err = transform.ErrShortSrc
+	return
+}
+
+// Reset resets the state and allows a Transformer to be reused.
+func (t *EnvTransformer) Reset() {
+	t.overflow = nil
+}
+
+func fullcopy(dst, src []byte) (n int, err error) {
+	n = copy(dst, src)
+	if n < len(src) {
+		err = transform.ErrShortDst
+	}
+	return
+}

file_test.go

@@ -0,0 +1,73 @@
+package file
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"io"
+	"os"
+	"testing"
+
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/config"
+	"go.unistack.org/micro/v4/options"
+)
+
+type jsoncodec struct{}
+
+func (*jsoncodec) Marshal(v interface{}, opts ...codec.Option) ([]byte, error) {
+	return json.Marshal(v)
+}
+
+func (*jsoncodec) Unmarshal(buf []byte, v interface{}, opts ...codec.Option) error {
+	return json.Unmarshal(buf, v)
+}
+
+func (*jsoncodec) ReadBody(r io.Reader, v interface{}) error {
+	return nil
+}
+
+func (*jsoncodec) ReadHeader(r io.Reader, m *codec.Message, t codec.MessageType) error {
+	return nil
+}
+
+func (*jsoncodec) String() string {
+	return "json"
+}
+
+func (*jsoncodec) Write(w io.Writer, m *codec.Message, v interface{}) error {
+	return nil
+}
+
+func TestLoadReplace(t *testing.T) {
+	type Config struct {
+		Key  string
+		Pass string
+	}
+	os.Setenv("PLACEHOLDER", "test")
+	cfg := &Config{}
+	ctx := context.TODO()
+	buf := bytes.NewReader([]byte(`{"key":"val","pass":"${PLACEHOLDER}"}`))
+	tr, err := NewEnvTransformer(`(?s)\$\{.*?\}`, 2, 1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	c := NewConfig(options.Codec(
+		&jsoncodec{}),
+		config.Struct(cfg),
+		Reader(buf),
+		Transformer(tr),
+	)
+
+	if err := c.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := c.Load(ctx); err != nil {
+		t.Fatal(err)
+	}
+
+	if cfg.Pass != "test" {
+		t.Fatalf("not works %#+v\n", cfg)
+	}
+}

go.mod

@@ -3,11 +3,8 @@ module go.unistack.org/micro-config-file/v4
 go 1.20
 
 require (
-	github.com/imdario/mergo v0.3.16
-	go.unistack.org/micro/v4 v4.0.15
+	dario.cat/mergo v1.0.0
+	go.unistack.org/micro/v4 v4.0.17
 )
 
-require (
-	dario.cat/mergo v1.0.0 // indirect
-	github.com/google/uuid v1.5.0 // indirect
-)
+require github.com/google/uuid v1.6.0 // indirect

go.sum

@@ -1,18 +1,9 @@
 dario.cat/mergo v1.0.0 h1:AGCNq9Evsj31mOgNPcLyXc+4PNABt905YmuqPYYpBWk=
 dario.cat/mergo v1.0.0/go.mod h1:uNxQE+84aUszobStD9th8a29P2fMDhsBdgRYvZOxGmk=
-github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
-github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
-github.com/google/uuid v1.5.0 h1:1p67kYwdtXjb0gL0BPiP1Av9wiZPo5A8z2cWkTZ+eyU=
-github.com/google/uuid v1.5.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
-github.com/imdario/mergo v0.3.15 h1:M8XP7IuFNsqUx6VPK2P9OSmsYsI/YFaGil0uD21V3dM=
-github.com/imdario/mergo v0.3.16 h1:wwQJbIsHYGMUyLSPrEq1CT16AhnhNJQ51+4fdHUnCl4=
-github.com/imdario/mergo v0.3.16/go.mod h1:WBLT9ZmE3lPoWsEzCh9LPo3TiwVN+ZKEjmz+hD27ysY=
-go.unistack.org/micro/v4 v4.0.1 h1:xo1IxbVfgh8i0eY0VeYa3cbb13u5n/Mxnp3FOgWD4Jo=
-go.unistack.org/micro/v4 v4.0.1/go.mod h1:p/J5UcSJjfHsWGT31uKoghQ5rUQZzQJBAFy+Z4+ZVMs=
-go.unistack.org/micro/v4 v4.0.6 h1:YFWvTh3VwyOd6NHYTQcf47n2TF5+p/EhpnbuBQX3qhk=
-go.unistack.org/micro/v4 v4.0.6/go.mod h1:bVEYTlPi0EsdgZZt311bIroDg9ict7ky3C87dSCCAGk=
-go.unistack.org/micro/v4 v4.0.15 h1:o4++RYX5guVPxfcJpP7VCj2Xr9BPFo6fj4+b5FStdEI=
-go.unistack.org/micro/v4 v4.0.15/go.mod h1:ZDgU9931vm2l7X6RN/6UuwRIVp24GRdmQ7dKmegArk4=
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+go.unistack.org/micro/v4 v4.0.17 h1:mF7uM+J4ILdG+1fcwzKYCwDlxhdbF/e1WnGzKKLnIXc=
+go.unistack.org/micro/v4 v4.0.17/go.mod h1:ZDgU9931vm2l7X6RN/6UuwRIVp24GRdmQ7dKmegArk4=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

options.go

@@ -1,7 +1,12 @@
 package file
 
 import (
+	"io"
+	"os"
+	"regexp"
+
 	"go.unistack.org/micro/v4/options"
+	"golang.org/x/text/transform"
 )
 
 type pathKey struct{}
@@ -9,3 +14,39 @@ type pathKey struct{}
 func Path(path string) options.Option {
 	return options.ContextOption(pathKey{}, path)
 }
+
+type readerKey struct{}
+
+func Reader(r io.Reader) options.Option {
+	return options.ContextOption(readerKey{}, r)
+}
+
+type transformerKey struct{}
+
+type TransformerFunc func(src []byte, index []int) []byte
+
+func Transformer(t transform.Transformer) options.Option {
+	return options.ContextOption(transformerKey{}, t)
+}
+
+func NewEnvTransformer(rs string, trimLeft, trimRight int) (*EnvTransformer, error) {
+	re, err := regexp.Compile(rs)
+	if err != nil {
+		return nil, err
+	}
+	return &EnvTransformer{
+		Regexp: re,
+		TransformerFunc: func(src []byte, index []int) []byte {
+			var envKey string
+			if len(src) > index[1]-trimRight {
+				envKey = string(src[index[0]+trimLeft : index[1]-trimRight])
+			}
+
+			if envVal, ok := os.LookupEnv(envKey); ok {
+				return []byte(envVal)
+			}
+
+			return src[index[0]:index[1]]
+		},
+	}, nil
+}

watcher.go

@@ -3,7 +3,6 @@ package file
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"reflect"
 
@@ -44,7 +43,7 @@ func (w *fileWatcher) run() {
 					return
 				}
 				var buf []byte
-				buf, err = ioutil.ReadAll(io.LimitReader(fp, int64(codec.DefaultMaxMsgSize)))
+				buf, err = io.ReadAll(io.LimitReader(fp, int64(codec.DefaultMaxMsgSize)))
 				if err == nil {
 					err = w.opts.Codec.Unmarshal(buf, dst)
 				}