update workflows

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

.github/workflows/autoapprove.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: approve
-        uses: hmarr/auto-approve-action@v3
+        uses: hmarr/auto-approve-action@v2
         if: github.actor == 'vtolstov' || github.actor == 'dependabot[bot]'
         id: approve
         with:

.github/workflows/build.yml

@@ -10,13 +10,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: setup
-      uses: actions/setup-go@v3
+      uses: actions/setup-go@v2
       with:
-        go-version: 1.17
+        go-version: 1.16
     - name: checkout
       uses: actions/checkout@v3
     - name: cache
-      uses: actions/cache@v3
+      uses: actions/cache@v2
       with:
         path: ~/go/pkg/mod
         key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
@@ -34,7 +34,7 @@ jobs:
       - name: checkout
         uses: actions/checkout@v3
       - name: lint
-        uses: golangci/golangci-lint-action@v3.4.0
+        uses: golangci/golangci-lint-action@v3.1.0
         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

@@ -45,12 +45,12 @@ jobs:
     - name: checkout
       uses: actions/checkout@v3
     - name: setup
-      uses: actions/setup-go@v3
+      uses: actions/setup-go@v2
       with:
-        go-version: 1.17
+        go-version: 1.16
     # Initializes the CodeQL tools for scanning.
     - name: init
-      uses: github/codeql-action/init@v2
+      uses: github/codeql-action/init@v1
       with:
         languages: ${{ matrix.language }}
         # If you wish to specify custom queries, you can do so here or in a config file.
@@ -61,7 +61,7 @@ jobs:
     # 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
+      uses: github/codeql-action/autobuild@v1
 
     # ℹ️ Command-line programs to run using the OS shell.
     # 📚 https://git.io/JvXDl
@@ -75,4 +75,4 @@ jobs:
     #   make release
 
     - name: analyze
-      uses: github/codeql-action/analyze@v2
+      uses: github/codeql-action/analyze@v1

.github/workflows/dependabot-automerge.yml

@@ -15,7 +15,7 @@ jobs:
     steps:
       - name: metadata
         id: metadata
-        uses: dependabot/fetch-metadata@v1.3.6
+        uses: dependabot/fetch-metadata@v1.3.0
         with:
           github-token: "${{ secrets.TOKEN }}"
       - name: merge

.github/workflows/pr.yml

@@ -10,13 +10,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: setup
-      uses: actions/setup-go@v3
+      uses: actions/setup-go@v2
       with:
-        go-version: 1.17
+        go-version: 1.16
     - name: checkout
       uses: actions/checkout@v3
     - name: cache
-      uses: actions/cache@v3
+      uses: actions/cache@v2
       with:
         path: ~/go/pkg/mod
         key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
@@ -34,7 +34,7 @@ jobs:
       - name: checkout
         uses: actions/checkout@v3
       - name: lint
-        uses: golangci/golangci-lint-action@v3.4.0
+        uses: golangci/golangci-lint-action@v3.1.0
         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.

file.go

@@ -4,23 +4,20 @@ import (
 	"context"
 	"fmt"
 	"io"
+	"io/ioutil"
 	"os"
-	"regexp"
 
-	"dario.cat/mergo"
+	"github.com/imdario/mergo"
 	"go.unistack.org/micro/v3/codec"
 	"go.unistack.org/micro/v3/config"
 	rutil "go.unistack.org/micro/v3/util/reflect"
-	"golang.org/x/text/transform"
 )
 
 var DefaultStructTag = "file"
 
 type fileConfig struct {
-	opts        config.Options
+	opts config.Options
-	path        string
+	path string
-	reader      io.Reader
-	transformer transform.Transformer
 }
 
 func (c *fileConfig) Options() config.Options {
@@ -28,10 +25,6 @@ func (c *fileConfig) Options() config.Options {
 }
 
 func (c *fileConfig) Init(opts ...config.Option) error {
-	if err := config.DefaultBeforeInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
-		return err
-	}
-
 	for _, o := range opts {
 		o(&c.opts)
 	}
@@ -40,38 +33,21 @@ func (c *fileConfig) Init(opts ...config.Option) error {
 		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.opts.Codec == nil {
+	if c.path == "" {
-		return fmt.Errorf("Codec must be specified")
+		err := fmt.Errorf("file path not exists: %v", c.path)
-	}
+		c.opts.Logger.Error(c.opts.Context, err)
-
-	if c.path == "" && c.reader == nil {
-		err := fmt.Errorf("Path or Reader must be specified")
 		if !c.opts.AllowFail {
 			return err
 		}
 	}
 
-	if err := config.DefaultAfterInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
-		return err
-	}
-
 	return nil
 }
 
 func (c *fileConfig) Load(ctx context.Context, opts ...config.LoadOption) error {
-	if c.opts.SkipLoad != nil && c.opts.SkipLoad(ctx, c) {
+	if err := config.DefaultBeforeLoad(ctx, c); err != nil {
-		return nil
-	}
-
-	if err := config.DefaultBeforeLoad(ctx, c); err != nil && !c.opts.AllowFail {
 		return err
 	}
 
@@ -83,61 +59,27 @@ func (c *fileConfig) Load(ctx context.Context, opts ...config.LoadOption) error
 		}
 	}
 
-	var fp io.Reader
+	fp, err := os.OpenFile(path, os.O_RDONLY, os.FileMode(0400))
-	var err error
-
-	if c.path != "" {
-		fp, err = os.OpenFile(path, os.O_RDONLY, os.FileMode(0o400))
-	} else if c.reader != nil {
-		fp = c.reader
-	} else {
-		err = fmt.Errorf("Path or Reader must be specified")
-	}
-
-	if err != nil {
-		if !c.opts.AllowFail {
-			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
-		}
-
-		return nil
-	}
-
-	if fpc, ok := fp.(io.Closer); ok {
-		defer fpc.Close()
-	}
-
-	var r io.Reader
-	if c.transformer != nil {
-		r = transform.NewReader(fp, c.transformer)
-	} else {
-		r = fp
-	}
-
-	buf, err := io.ReadAll(io.LimitReader(r, int64(codec.DefaultMaxMsgSize)))
 	if err != nil {
+		c.opts.Logger.Errorf(c.opts.Context, "file load path %s error: %v", path, err)
 		if !c.opts.AllowFail {
 			return err
 		}
-		if err = config.DefaultAfterLoad(ctx, c); err != nil && !c.opts.AllowFail {
+		return config.DefaultAfterLoad(ctx, c)
+	}
+
+	defer fp.Close()
+
+	buf, err := ioutil.ReadAll(io.LimitReader(fp, int64(codec.DefaultMaxMsgSize)))
+	if err != nil {
+		c.opts.Logger.Errorf(c.opts.Context, "file load path %s error: %v", path, err)
+		if !c.opts.AllowFail {
 			return err
 		}
-
+		return config.DefaultAfterLoad(ctx, c)
-		return nil
 	}
 
-	dst := c.opts.Struct
+	src, err := rutil.Zero(c.opts.Struct)
-	if options.Struct != nil {
-		dst = options.Struct
-	}
-
-	src, err := rutil.Zero(dst)
 	if err == nil {
 		err = c.opts.Codec.Unmarshal(buf, src)
 		if err == nil {
@@ -149,15 +91,18 @@ func (c *fileConfig) Load(ctx context.Context, opts ...config.LoadOption) error
 			if options.Append {
 				mopts = append(mopts, mergo.WithAppendSlice)
 			}
-			err = mergo.Merge(dst, src, mopts...)
+			err = mergo.Merge(c.opts.Struct, src, mopts...)
 		}
 	}
 
-	if err != nil && !c.opts.AllowFail {
+	if err != nil {
-		return err
+		c.opts.Logger.Errorf(c.opts.Context, "file load path %s error: %v", path, err)
+		if !c.opts.AllowFail {
+			return err
+		}
 	}
 
-	if err := config.DefaultAfterLoad(ctx, c); err != nil && !c.opts.AllowFail {
+	if err := config.DefaultAfterLoad(ctx, c); err != nil {
 		return err
 	}
 
@@ -165,11 +110,7 @@ func (c *fileConfig) Load(ctx context.Context, opts ...config.LoadOption) error
 }
 
 func (c *fileConfig) Save(ctx context.Context, opts ...config.SaveOption) error {
-	if c.opts.SkipSave != nil && c.opts.SkipSave(ctx, c) {
+	if err := config.DefaultBeforeSave(ctx, c); err != nil {
-		return nil
-	}
-
-	if err := config.DefaultBeforeSave(ctx, c); err != nil && !c.opts.AllowFail {
 		return err
 	}
 
@@ -181,33 +122,22 @@ func (c *fileConfig) Save(ctx context.Context, opts ...config.SaveOption) error
 		}
 	}
 
-	dst := c.opts.Struct
+	buf, err := c.opts.Codec.Marshal(c.opts.Struct)
-	if options.Struct != nil {
-		dst = options.Struct
-	}
-
-	buf, err := c.opts.Codec.Marshal(dst)
 	if err != nil {
+		c.opts.Logger.Errorf(c.opts.Context, "file save path %s error: %v", path, err)
 		if !c.opts.AllowFail {
 			return err
 		}
-		if err = config.DefaultAfterSave(ctx, c); err != nil && !c.opts.AllowFail {
+		return config.DefaultAfterSave(ctx, c)
-			return err
-		}
-
-		return nil
 	}
 
-	fp, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE, os.FileMode(0o600))
+	fp, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE, os.FileMode(0600))
 	if err != nil {
+		c.opts.Logger.Errorf(c.opts.Context, "file save path %s error: %v", path, err)
 		if !c.opts.AllowFail {
 			return err
 		}
-		if err = config.DefaultAfterSave(ctx, c); err != nil && !c.opts.AllowFail {
+		return config.DefaultAfterSave(ctx, c)
-			return err
-		}
-
-		return nil
 	}
 	defer fp.Close()
 
@@ -215,11 +145,14 @@ func (c *fileConfig) Save(ctx context.Context, opts ...config.SaveOption) error
 		err = fp.Close()
 	}
 
-	if err != nil && !c.opts.AllowFail {
+	if err != nil {
-		return err
+		c.opts.Logger.Errorf(c.opts.Context, "file save path %s error: %v", path, err)
+		if !c.opts.AllowFail {
+			return err
+		}
 	}
 
-	if err := config.DefaultAfterSave(ctx, c); err != nil && !c.opts.AllowFail {
+	if err := config.DefaultAfterSave(ctx, c); err != nil {
 		return err
 	}
 
@@ -264,82 +197,3 @@ func NewConfig(opts ...config.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

@@ -1,72 +0,0 @@
-package file
-
-import (
-	"bytes"
-	"context"
-	"encoding/json"
-	"io"
-	"os"
-	"testing"
-
-	"go.unistack.org/micro/v3/codec"
-	"go.unistack.org/micro/v3/config"
-)
-
-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(config.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

@@ -1,10 +1,8 @@
 module go.unistack.org/micro-config-file/v3
 
-go 1.18
+go 1.16
 
 require (
-	dario.cat/mergo v1.0.0
+	github.com/imdario/mergo v0.3.12
-	go.unistack.org/micro/v3 v3.10.44
+	go.unistack.org/micro/v3 v3.8.21
 )
-
-require github.com/google/uuid v1.6.0 // indirect

go.sum

@@ -1,9 +1,153 @@
-dario.cat/mergo v1.0.0 h1:AGCNq9Evsj31mOgNPcLyXc+4PNABt905YmuqPYYpBWk=
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-dario.cat/mergo v1.0.0/go.mod h1:uNxQE+84aUszobStD9th8a29P2fMDhsBdgRYvZOxGmk=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
-go.unistack.org/micro/v3 v3.10.44 h1:Vgyy9BrJOSdFvo29/klrgIBE/Nme9E8udPAljos34o0=
+github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
-go.unistack.org/micro/v3 v3.10.44/go.mod h1:erMgt3Bl7vQQ0e9UpQyR5NlLiZ9pKeEJ9+1tfYFaqUg=
+github.com/buger/jsonparser v1.1.1/go.mod h1:6RYKKt7H4d4+iWqouImQ9R2FZql3VbhNgx27UK13J/0=
+github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
+github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
+github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
+github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
+github.com/cncf/xds/go v0.0.0-20210312221358-fbca930ec8ed/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/docopt/docopt-go v0.0.0-20180111231733-ee0de3bc6815/go.mod h1:WwZ+bS3ebgob9U8Nd0kOddGdZWjyMGR8Wziv+TBNwSE=
+github.com/ef-ds/deque v1.0.4/go.mod h1:gXDnTC3yqvBcHbq2lcExjtAcVrOnJCbMcZXmuj8Z4tg=
+github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
+github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
+github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
+github.com/envoyproxy/go-control-plane v0.9.9-0.20201210154907-fd9021fe5dad/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk=
+github.com/envoyproxy/go-control-plane v0.9.9-0.20210512163311-63b5d3c536b0/go.mod h1:hliV/p42l8fGbc6Y9bQ70uLwIvmJyVE5k4iMKlh8wCQ=
+github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
+github.com/flowstack/go-jsonschema v0.1.1/go.mod h1:yL7fNggx1o8rm9RlgXv7hTBWxdBM0rVwpMwimd3F3N0=
+github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
+github.com/golang-jwt/jwt/v4 v4.2.0/go.mod h1:/xlHOz8bRuivTWchD4jCa+NbatV+wEUSzwAxVc6locg=
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+gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

options.go

@@ -1,12 +1,7 @@
 package file
 
 import (
-	"io"
-	"os"
-	"regexp"
-
 	"go.unistack.org/micro/v3/config"
-	"golang.org/x/text/transform"
 )
 
 type pathKey struct{}
@@ -26,39 +21,3 @@ func SavePath(path string) config.SaveOption {
 func WatchPath(path string) config.WatchOption {
 	return config.SetWatchOption(pathKey{}, path)
 }
-
-type readerKey struct{}
-
-func Reader(r io.Reader) config.Option {
-	return config.SetOption(readerKey{}, r)
-}
-
-type transformerKey struct{}
-
-type TransformerFunc func(src []byte, index []int) []byte
-
-func Transformer(t transform.Transformer) config.Option {
-	return config.SetOption(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
-}