update deps

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@v2
+        uses: hmarr/auto-approve-action@v3
         if: github.actor == 'vtolstov' || github.actor == 'dependabot[bot]'
         id: approve
         with:

.github/workflows/build.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: setup
-      uses: actions/setup-go@v2
+      uses: actions/setup-go@v3
       with:
         go-version: 1.17
     - name: checkout
@@ -34,7 +34,7 @@ jobs:
       - name: checkout
         uses: actions/checkout@v3
       - name: lint
-        uses: golangci/golangci-lint-action@v3.1.0
+        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

@@ -45,12 +45,12 @@ jobs:
     - name: checkout
       uses: actions/checkout@v3
     - name: setup
-      uses: actions/setup-go@v2
+      uses: actions/setup-go@v3
       with:
         go-version: 1.17
     # Initializes the CodeQL tools for scanning.
     - name: init
-      uses: github/codeql-action/init@v1
+      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.
@@ -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@v1
+      uses: github/codeql-action/autobuild@v2
 
     # 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@v1
+      uses: github/codeql-action/analyze@v2

.github/workflows/dependabot-automerge.yml

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

.github/workflows/pr.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: setup
-      uses: actions/setup-go@v2
+      uses: actions/setup-go@v3
       with:
         go-version: 1.17
     - name: checkout
@@ -34,7 +34,7 @@ jobs:
       - name: checkout
         uses: actions/checkout@v3
       - name: lint
-        uses: golangci/golangci-lint-action@v3.1.0
+        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.

flag.go

@@ -1,4 +1,4 @@
-package flag // import "go.unistack.org/micro-config-flag/v3"
+package flag
 
 import (
 	"context"
@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"os"
 	"reflect"
+	"strings"
 	"time"
 
 	"go.unistack.org/micro/v3/config"
@@ -30,6 +31,8 @@ var (
 type flagConfig struct {
 	fset *flag.FlagSet
 	opts config.Options
+	name string
+	env  string
 }
 
 func (c *flagConfig) Options() config.Options {
@@ -41,18 +44,35 @@ func (c *flagConfig) Init(opts ...config.Option) error {
 		o(&c.opts)
 	}
 
-	fields, err := rutil.StructFields(c.opts.Struct)
-	if err != nil {
+	if err := config.DefaultBeforeInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
 		return err
 	}
 
-	// flag.CommandLine.Init(os.Args[0], flag.ContinueOnError)
+	c.configure()
+
+	fields, err := rutil.StructFields(c.opts.Struct)
+	if err != nil {
+		if !c.opts.AllowFail {
+			return err
+		}
+
+		if err := config.DefaultAfterInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
+			return err
+		}
+
+		return nil
+	}
+
 	for _, sf := range fields {
 		tf, ok := sf.Field.Tag.Lookup(c.opts.StructTag)
 		if !ok {
 			continue
 		}
+
 		fn, fd, fv := getFlagOpts(tf)
+		if tf, ok = sf.Field.Tag.Lookup(c.env); ok {
+			fd += fmt.Sprintf(" (env %s)", tf)
+		}
 
 		rcheck := true
 
@@ -67,7 +87,6 @@ func (c *flagConfig) Init(opts ...config.Option) error {
 			return nil
 		}
 
-		fmt.Printf("register %s flag\n", fn)
 		switch vi.(type) {
 		case time.Duration:
 			err = c.flagDuration(sf.Value, fn, fv, fd)
@@ -78,10 +97,13 @@ func (c *flagConfig) Init(opts ...config.Option) error {
 		}
 
 		if err != nil {
-			c.opts.Logger.Errorf(c.opts.Context, "flag init error: %v", err)
 			if !c.opts.AllowFail {
 				return err
 			}
+			if err := config.DefaultAfterInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
+				return err
+			}
+
 			return nil
 		}
 
@@ -114,26 +136,60 @@ func (c *flagConfig) Init(opts ...config.Option) error {
 			err = c.flagMap(sf.Value, fn, fv, fd)
 		}
 		if err != nil {
-			c.opts.Logger.Errorf(c.opts.Context, "flag init error: %v", err)
 			if !c.opts.AllowFail {
 				return err
 			}
+
+			if err := config.DefaultAfterInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
+				return err
+			}
+
 			return nil
 		}
 	}
 
+	if err := config.DefaultAfterInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
+		return err
+	}
+
 	return nil
 }
 
 func (c *flagConfig) Load(ctx context.Context, opts ...config.LoadOption) error {
+	if c.opts.SkipLoad != nil && c.opts.SkipLoad(ctx, c) {
+		return nil
+	}
+
 	options := config.NewLoadOptions(opts...)
 	_ = options
+
+	if err := config.DefaultBeforeLoad(ctx, c); err != nil && !c.opts.AllowFail {
+		return err
+	}
+
+	if err := config.DefaultAfterLoad(ctx, c); err != nil && !c.opts.AllowFail {
+		return err
+	}
+
 	// TODO: allow merge, append and so
 	flag.Parse()
+
 	return nil
 }
 
 func (c *flagConfig) Save(ctx context.Context, opts ...config.SaveOption) error {
+	if c.opts.SkipSave != nil && c.opts.SkipSave(ctx, c) {
+		return nil
+	}
+
+	if err := config.DefaultBeforeSave(ctx, c); err != nil && !c.opts.AllowFail {
+		return err
+	}
+
+	if err := config.DefaultAfterSave(ctx, c); err != nil && !c.opts.AllowFail {
+		return err
+	}
+
 	return nil
 }
 
@@ -149,42 +205,125 @@ func (c *flagConfig) Watch(ctx context.Context, opts ...config.WatchOption) (con
 	return nil, fmt.Errorf("not implemented")
 }
 
+func (c *flagConfig) usage() {
+	mapDelim := DefaultMapDelim
+	sliceDelim := DefaultSliceDelim
+
+	if c.opts.Context != nil {
+		if d, ok := c.opts.Context.Value(mapDelimKey{}).(string); ok {
+			mapDelim = d
+		}
+		if d, ok := c.opts.Context.Value(sliceDelimKey{}).(string); ok {
+			sliceDelim = d
+		}
+	}
+
+	if c.name == "" {
+		fmt.Fprintf(c.fset.Output(), "Usage:\n")
+	} else {
+		fmt.Fprintf(c.fset.Output(), "Usage of %s:\n", c.name)
+	}
+
+	c.fset.VisitAll(func(f *flag.Flag) {
+		var b strings.Builder
+		fmt.Fprintf(&b, "  -%s", f.Name) // Two spaces before -; see next two comments.
+		_, usage := flag.UnquoteUsage(f)
+		name := "value"
+		v := reflect.TypeOf(f.Value).String()
+		b.WriteString(" ")
+		switch v {
+		case "*flag.boolFlag":
+			name = "bool"
+		case "*flag.durationValue":
+			name = "duration"
+		case "*flag.float64Value":
+			name = "float"
+		case "*flag.intValue", "*flag.int64Value":
+			name = "int"
+		case "*flag.stringValue":
+			name = "string"
+		case "*flag.uintValue", "*flag.uint64Value":
+			name = "uint"
+		case "*flag.mapValue":
+			//	nv := f.Value.(*mapValue)
+			name = fmt.Sprintf("string key=val with %q as separator", mapDelim)
+		case "*flag.sliceValue":
+			//	nv := f.Value.(*sliceValue)
+			name = fmt.Sprintf("string with %q as separator", sliceDelim)
+		}
+		b.WriteString(name)
+
+		// Boolean flags of one ASCII letter are so common we
+		// treat them specially, putting their usage on the same line.
+		if b.Len() <= 4 { // space, space, '-', 'x'.
+			b.WriteString("\t")
+		} else {
+			// Four spaces before the tab triggers good alignment
+			// for both 4- and 8-space tab stops.
+			b.WriteString("\n    \t")
+		}
+		b.WriteString(strings.ReplaceAll(usage, "\n", "\n    \t"))
+
+		if f.Value.String() == f.DefValue {
+			fmt.Fprintf(&b, " (default %q)", f.DefValue)
+		} else {
+			fmt.Fprintf(&b, " (default %q current %q)", f.DefValue, f.Value)
+		}
+
+		fmt.Fprint(c.fset.Output(), b.String(), "\n")
+	})
+}
+
+func (c *flagConfig) configure() {
+	flagSet := flag.CommandLine
+	flagSetName := os.Args[0]
+	flagSetErrorHandling := flag.ExitOnError
+	flagEnv := "env"
+	var flagUsage func()
+	var isSet bool
+
+	if c.opts.Context != nil {
+		if v, ok := c.opts.Context.Value(flagSetNameKey{}).(string); ok {
+			isSet = true
+			flagSetName = v
+		}
+		if v, ok := c.opts.Context.Value(flagSetErrorHandlingKey{}).(flag.ErrorHandling); ok {
+			isSet = true
+			flagSetErrorHandling = v
+		}
+		if v, ok := c.opts.Context.Value(flagSetKey{}).(*flag.FlagSet); ok {
+			flagSet = v
+		}
+		if v, ok := c.opts.Context.Value(flagSetUsageKey{}).(func()); ok {
+			flagUsage = v
+		}
+		if v, ok := c.opts.Context.Value(flagEnvKey{}).(string); ok {
+			flagEnv = v
+		}
+	}
+	c.fset = flagSet
+
+	if isSet {
+		c.fset.Init(flagSetName, flagSetErrorHandling)
+	}
+	if flagUsage != nil {
+		c.fset.Usage = flagUsage
+	} else {
+		c.fset.Usage = c.usage
+	}
+	c.env = flagEnv
+
+	c.name = flagSetName
+}
+
 func NewConfig(opts ...config.Option) config.Config {
 	options := config.NewOptions(opts...)
 	if len(options.StructTag) == 0 {
 		options.StructTag = DefaultStructTag
 	}
-	flagSet := flag.CommandLine
-	flagSetName := os.Args[0]
-	flagSetErrorHandling := flag.ExitOnError
-	var flagUsage func()
-	var isSet bool
 
-	if options.Context != nil {
-		if v, ok := options.Context.Value(flagSetNameKey{}).(string); ok {
-			isSet = true
-			flagSetName = v
-		}
-		if v, ok := options.Context.Value(flagSetErrorHandlingKey{}).(flag.ErrorHandling); ok {
-			isSet = true
-			flagSetErrorHandling = v
-		}
-		if v, ok := options.Context.Value(flagSetKey{}).(*flag.FlagSet); ok {
-			flagSet = v
-		}
-		if v, ok := options.Context.Value(flagSetUsageKey{}).(func()); ok {
-			flagUsage = v
-		}
-	}
-
-	if isSet {
-		flagSet.Init(flagSetName, flagSetErrorHandling)
-	}
-	if flagUsage != nil {
-		flagSet.Usage = flagUsage
-	}
-
-	c := &flagConfig{opts: options, fset: flagSet}
+	c := &flagConfig{opts: options}
+	c.configure()
 
 	return c
 }

go.mod

@@ -1,5 +1,10 @@
 module go.unistack.org/micro-config-flag/v3
 
-go 1.16
+go 1.18
 
-require go.unistack.org/micro/v3 v3.9.7
+require go.unistack.org/micro/v3 v3.10.44
+
+require (
+	dario.cat/mergo v1.0.0 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+)

go.sum

@@ -1,159 +1,9 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
-github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
-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=
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-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=
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+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

options.go

@@ -54,3 +54,11 @@ type flagSetUsageKey struct{}
 func FlagUsage(fn func()) config.Option {
 	return config.SetOption(flagSetUsageKey{}, fn)
 }
+
+
+type flagEnvKey struct{}
+
+// FlagEnv set flag set usage func
+func FlagEnv(n string) config.Option {
+	return config.SetOption(flagEnvKey{}, n)
+}

util.go

@@ -15,7 +15,7 @@ type mapValue struct {
 	v     reflect.Value
 }
 
-func (v mapValue) String() string {
+func (v *mapValue) String() string {
 	if v.v.Kind() != reflect.Invalid {
 		var kv []string
 		it := v.v.MapRange()
@@ -29,7 +29,11 @@ func (v mapValue) String() string {
 	return v.def
 }
 
-func (v mapValue) Set(s string) error {
+func (v *mapValue) Get() interface{} {
+	return v.v.Interface()
+}
+
+func (v *mapValue) Set(s string) error {
 	ps := strings.Split(s, v.delim)
 	if len(ps) == 0 {
 		return nil
@@ -72,7 +76,7 @@ type sliceValue struct {
 	v     reflect.Value
 }
 
-func (v sliceValue) String() string {
+func (v *sliceValue) String() string {
 	if v.v.Kind() != reflect.Invalid {
 		var kv []string
 		for idx := 0; idx < v.v.Len(); idx++ {
@@ -83,7 +87,11 @@ func (v sliceValue) String() string {
 	return v.def
 }
 
-func (v sliceValue) Set(s string) error {
+func (v *sliceValue) Get() interface{} {
+	return v.v.Interface()
+}
+
+func (v *sliceValue) Set(s string) error {
 	p := strings.Split(s, v.delim)
 	v.v.Set(reflect.MakeSlice(v.v.Type(), len(p), len(p)))
 	switch v.v.Type().Elem().Kind() {