config: add Validate func, small lint fixes

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

broker/broker.go

@@ -50,6 +50,7 @@ type Handler func(Event) error
 // Events contains multiple events
 type Events []Event
 
+// Ack try to ack all events and return
 func (evs Events) Ack() error {
 	var err error
 	for _, ev := range evs {
@@ -60,6 +61,7 @@ func (evs Events) Ack() error {
 	return nil
 }
 
+// SetError sets error on event
 func (evs Events) SetError(err error) {
 	for _, ev := range evs {
 		ev.SetError(err)

config/config.go

@@ -4,11 +4,16 @@ package config // import "go.unistack.org/micro/v3/config"
 import (
 	"context"
 	"errors"
+	"reflect"
 	"time"
 )
 
+type Validator interface {
+	Validate() error
+}
+
 // DefaultConfig default config
-var DefaultConfig Config = NewConfig()
+var DefaultConfig = NewConfig()
 
 // DefaultWatcherMinInterval default min interval for poll changes
 var DefaultWatcherMinInterval = 5 * time.Second
@@ -67,7 +72,59 @@ func Load(ctx context.Context, cs []Config, opts ...LoadOption) error {
 	return nil
 }
 
+// Validate runs Validate() error func for each struct field
+func Validate(ctx context.Context, cfg interface{}) error {
+	if cfg == nil {
+		return nil
+	}
+
+	if v, ok := cfg.(Validator); ok {
+		if err := v.Validate(); err != nil {
+			return err
+		}
+	}
+
+	sv := reflect.ValueOf(cfg)
+	if sv.Kind() == reflect.Ptr {
+		sv = sv.Elem()
+	}
+	if sv.Kind() != reflect.Struct {
+		return nil
+	}
+
+	typ := sv.Type()
+	for idx := 0; idx < typ.NumField(); idx++ {
+		fld := typ.Field(idx)
+		val := sv.Field(idx)
+		if !val.IsValid() || len(fld.PkgPath) != 0 {
+			continue
+		}
+
+		if v, ok := val.Interface().(Validator); ok {
+			if err := v.Validate(); err != nil {
+				return err
+			}
+		}
+
+		switch val.Kind() {
+		case reflect.Ptr:
+			if reflect.Indirect(val).Kind() == reflect.Struct {
+				if err := Validate(ctx, val.Interface()); err != nil {
+					return err
+				}
+			}
+		case reflect.Struct:
+			if err := Validate(ctx, val.Interface()); err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
 var (
+	// DefaultAfterLoad default func that runs after config load
 	DefaultAfterLoad = func(ctx context.Context, c Config) error {
 		for _, fn := range c.Options().AfterLoad {
 			if err := fn(ctx, c); err != nil {
@@ -79,7 +136,7 @@ var (
 		}
 		return nil
 	}
-
+	// DefaultAfterSave default func that runs after config save
 	DefaultAfterSave = func(ctx context.Context, c Config) error {
 		for _, fn := range c.Options().AfterSave {
 			if err := fn(ctx, c); err != nil {
@@ -91,7 +148,7 @@ var (
 		}
 		return nil
 	}
-
+	// DefaultBeforeLoad default func that runs before config load
 	DefaultBeforeLoad = func(ctx context.Context, c Config) error {
 		for _, fn := range c.Options().BeforeLoad {
 			if err := fn(ctx, c); err != nil {
@@ -103,11 +160,11 @@ var (
 		}
 		return nil
 	}
-
+	// DefaultBeforeSave default func that runs befora config save
 	DefaultBeforeSave = func(ctx context.Context, c Config) error {
 		for _, fn := range c.Options().BeforeSave {
 			if err := fn(ctx, c); err != nil {
-				c.Options().Logger.Errorf(ctx, "%s BeforeSavec err: %v", c.String(), err)
+				c.Options().Logger.Errorf(ctx, "%s BeforeSave err: %v", c.String(), err)
 				if !c.Options().AllowFail {
 					return err
 				}

config/default_test.go

@@ -8,30 +8,46 @@ import (
 	"go.unistack.org/micro/v3/config"
 )
 
-type Cfg struct {
+type cfg struct {
 	StringValue string `default:"string_value"`
 	IgnoreValue string `json:"-"`
-	StructValue struct {
-		StringValue string `default:"string_value"`
+	StructValue *cfgStructValue
+	IntValue    int `default:"99"`
+}
+
+type cfgStructValue struct {
+	StringValue string `default:"string_value"`
+}
+
+func (c *cfg) Validate() error {
+	if c.IntValue != 10 {
+		return fmt.Errorf("invalid IntValue %d != %d", 10, c.IntValue)
 	}
-	IntValue int `default:"99"`
+	return nil
+}
+
+func (c *cfgStructValue) Validate() error {
+	if c.StringValue != "string_value" {
+		return fmt.Errorf("invalid StringValue %s != %s", "string_value", c.StringValue)
+	}
+	return nil
 }
 
 func TestDefault(t *testing.T) {
 	ctx := context.Background()
-	conf := &Cfg{IntValue: 10}
-	blfn := func(ctx context.Context, cfg config.Config) error {
-		nconf, ok := cfg.Options().Struct.(*Cfg)
+	conf := &cfg{IntValue: 10}
+	blfn := func(_ context.Context, c config.Config) error {
+		nconf, ok := c.Options().Struct.(*cfg)
 		if !ok {
-			return fmt.Errorf("failed to get Struct from options: %v", cfg.Options())
+			return fmt.Errorf("failed to get Struct from options: %v", c.Options())
 		}
 		nconf.StringValue = "before_load"
 		return nil
 	}
-	alfn := func(ctx context.Context, cfg config.Config) error {
-		nconf, ok := cfg.Options().Struct.(*Cfg)
+	alfn := func(_ context.Context, c config.Config) error {
+		nconf, ok := c.Options().Struct.(*cfg)
 		if !ok {
-			return fmt.Errorf("failed to get Struct from options: %v", cfg.Options())
+			return fmt.Errorf("failed to get Struct from options: %v", c.Options())
 		}
 		nconf.StringValue = "after_load"
 		return nil
@@ -50,3 +66,19 @@ func TestDefault(t *testing.T) {
 	_ = conf
 	// t.Logf("%#+v\n", conf)
 }
+
+func TestValidate(t *testing.T) {
+	ctx := context.Background()
+	conf := &cfg{IntValue: 10}
+	cfg := config.NewConfig(config.Struct(conf))
+	if err := cfg.Init(); err != nil {
+		t.Fatal(err)
+	}
+	if err := cfg.Load(ctx); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := config.Validate(ctx, conf); err != nil {
+		t.Fatal(err)
+	}
+}

config/options.go

@@ -69,6 +69,7 @@ type LoadOptions struct {
 	Context  context.Context
 }
 
+// NewLoadOptions create LoadOptions struct with provided opts
 func NewLoadOptions(opts ...LoadOption) LoadOptions {
 	options := LoadOptions{}
 	for _, o := range opts {
@@ -221,8 +222,10 @@ type WatchOptions struct {
 	Coalesce bool
 }
 
+// WatchOption func signature
 type WatchOption func(*WatchOptions)
 
+// NewWatchOptions create WatchOptions struct with provided opts
 func NewWatchOptions(opts ...WatchOption) WatchOptions {
 	options := WatchOptions{
 		Context:     context.Background(),

flow/flow.go

@@ -11,7 +11,9 @@ import (
 )
 
 var (
+	// ErrStepNotExists returns when step not found
 	ErrStepNotExists = errors.New("step not exists")
+	// ErrMissingClient returns when client.Client is missing
 	ErrMissingClient = errors.New("client not set")
 )
 
@@ -36,6 +38,7 @@ func (m *RawMessage) UnmarshalJSON(data []byte) error {
 	return nil
 }
 
+// Message used to transfer data between steps
 type Message struct {
 	Header metadata.Metadata
 	Body   RawMessage
@@ -67,6 +70,7 @@ type Step interface {
 	Response() *Message
 }
 
+// Status contains step current status
 type Status int
 
 func (status Status) String() string {
@@ -74,15 +78,22 @@ func (status Status) String() string {
 }
 
 const (
+	// StatusPending step waiting to start
 	StatusPending Status = iota
+	// StatusRunning step is running
 	StatusRunning
+	// StatusFailure step competed with error
 	StatusFailure
+	// StatusSuccess step completed without error
 	StatusSuccess
+	// StatusAborted step aborted while it running
 	StatusAborted
+	// StatusSuspend step suspended
 	StatusSuspend
 )
 
 var (
+	// StatusString contains map status => string
 	StatusString = map[Status]string{
 		StatusPending: "StatusPending",
 		StatusRunning: "StatusRunning",
@@ -91,6 +102,7 @@ var (
 		StatusAborted: "StatusAborted",
 		StatusSuspend: "StatusSuspend",
 	}
+	// StringStatus contains map string => status
 	StringStatus = map[string]Status{
 		"StatusPending": StatusPending,
 		"StatusRunning": StatusRunning,
@@ -144,6 +156,7 @@ var (
 	atomicSteps atomic.Value
 )
 
+// RegisterStep register own step with workflow
 func RegisterStep(step Step) {
 	flowMu.Lock()
 	steps, _ := atomicSteps.Load().([]Step)

flow/options.go

@@ -91,7 +91,7 @@ func Store(s store.Store) Option {
 	}
 }
 
-// WorflowOption func signature
+// WorkflowOption func signature
 type WorkflowOption func(*WorkflowOptions)
 
 // WorkflowOptions holds workflow options

logger/wrapper/wrapper.go

@@ -11,6 +11,7 @@ import (
 )
 
 var (
+	// DefaultClientCallObserver called by wrapper in client Call
 	DefaultClientCallObserver = func(ctx context.Context, req client.Request, rsp interface{}, opts []client.CallOption, err error) []string {
 		labels := []string{"service", req.Service(), "endpoint", req.Endpoint()}
 		if err != nil {
@@ -19,6 +20,7 @@ var (
 		return labels
 	}
 
+	// DefaultClientStreamObserver called by wrapper in client Stream
 	DefaultClientStreamObserver = func(ctx context.Context, req client.Request, opts []client.CallOption, stream client.Stream, err error) []string {
 		labels := []string{"service", req.Service(), "endpoint", req.Endpoint()}
 		if err != nil {
@@ -27,6 +29,7 @@ var (
 		return labels
 	}
 
+	// DefaultClientPublishObserver called by wrapper in client Publish
 	DefaultClientPublishObserver = func(ctx context.Context, msg client.Message, opts []client.PublishOption, err error) []string {
 		labels := []string{"endpoint", msg.Topic()}
 		if err != nil {
@@ -35,6 +38,7 @@ var (
 		return labels
 	}
 
+	// DefaultServerHandlerObserver called by wrapper in server Handler
 	DefaultServerHandlerObserver = func(ctx context.Context, req server.Request, rsp interface{}, err error) []string {
 		labels := []string{"service", req.Service(), "endpoint", req.Endpoint()}
 		if err != nil {
@@ -43,6 +47,7 @@ var (
 		return labels
 	}
 
+	// DefaultServerSubscriberObserver called by wrapper in server Subscriber
 	DefaultServerSubscriberObserver = func(ctx context.Context, msg server.Message, err error) []string {
 		labels := []string{"endpoint", msg.Topic()}
 		if err != nil {
@@ -51,6 +56,7 @@ var (
 		return labels
 	}
 
+	// DefaultClientCallFuncObserver called by wrapper in client CallFunc
 	DefaultClientCallFuncObserver = func(ctx context.Context, addr string, req client.Request, rsp interface{}, opts client.CallOptions, err error) []string {
 		labels := []string{"service", req.Service(), "endpoint", req.Endpoint()}
 		if err != nil {
@@ -59,6 +65,7 @@ var (
 		return labels
 	}
 
+	// DefaultSkipEndpoints wrapper not called for this endpoints
 	DefaultSkipEndpoints = []string{"Meter.Metrics"}
 )
 
@@ -71,11 +78,17 @@ type lWrapper struct {
 }
 
 type (
-	ClientCallObserver       func(context.Context, client.Request, interface{}, []client.CallOption, error) []string
-	ClientStreamObserver     func(context.Context, client.Request, []client.CallOption, client.Stream, error) []string
-	ClientPublishObserver    func(context.Context, client.Message, []client.PublishOption, error) []string
-	ClientCallFuncObserver   func(context.Context, string, client.Request, interface{}, client.CallOptions, error) []string
-	ServerHandlerObserver    func(context.Context, server.Request, interface{}, error) []string
+	// ClientCallObserver func signature
+	ClientCallObserver func(context.Context, client.Request, interface{}, []client.CallOption, error) []string
+	// ClientStreamObserver func signature
+	ClientStreamObserver func(context.Context, client.Request, []client.CallOption, client.Stream, error) []string
+	// ClientPublishObserver func signature
+	ClientPublishObserver func(context.Context, client.Message, []client.PublishOption, error) []string
+	// ClientCallFuncObserver func signature
+	ClientCallFuncObserver func(context.Context, string, client.Request, interface{}, client.CallOptions, error) []string
+	// ServerHandlerObserver func signature
+	ServerHandlerObserver func(context.Context, server.Request, interface{}, error) []string
+	// ServerSubscriberObserver func signature
 	ServerSubscriberObserver func(context.Context, server.Message, error) []string
 )
 

meter/meter.go

@@ -102,7 +102,7 @@ func (k byKey) Swap(i, j int) {
 	k[i*2+1], k[j*2+1] = k[j*2+1], k[i*2+1]
 }
 
-// BuildLables used to sort labels and delete duplicates.
+// BuildLabels used to sort labels and delete duplicates.
 // Last value wins in case of duplicate label keys.
 func BuildLabels(labels ...string) []string {
 	if len(labels)%2 == 1 {

meter/wrapper/wrapper.go

@@ -104,7 +104,7 @@ func Meter(m meter.Meter) Option {
 	}
 }
 
-// SkipEndpoint add endpoint to skip
+// SkipEndoints add endpoint to skip
 func SkipEndoints(eps ...string) Option {
 	return func(o *Options) {
 		o.SkipEndpoints = append(o.SkipEndpoints, eps...)
@@ -294,7 +294,7 @@ func (w *wrapper) HandlerFunc(fn server.HandlerFunc) server.HandlerFunc {
 	}
 }
 
-// NewSubscribeWrapper create server subscribe wrapper
+// NewSubscriberWrapper create server subscribe wrapper
 func NewSubscriberWrapper(opts ...Option) server.SubscriberWrapper {
 	handler := &wrapper{
 		opts: NewOptions(opts...),

register/options.go

@@ -44,9 +44,8 @@ func NewOptions(opts ...Option) Options {
 	return options
 }
 
-// nolint: golint,revive
 // RegisterOptions holds options for register method
-type RegisterOptions struct {
+type RegisterOptions struct { // nolint: golint,revive
 	Context  context.Context
 	Domain   string
 	TTL      time.Duration
@@ -197,33 +196,29 @@ func TLSConfig(t *tls.Config) Option {
 	}
 }
 
-// nolint: golint,revive
 // RegisterAttempts specifies register atempts count
-func RegisterAttempts(t int) RegisterOption {
+func RegisterAttempts(t int) RegisterOption { // nolint: golint,revive
 	return func(o *RegisterOptions) {
 		o.Attempts = t
 	}
 }
 
-// nolint: golint,revive
 // RegisterTTL specifies register ttl
-func RegisterTTL(t time.Duration) RegisterOption {
+func RegisterTTL(t time.Duration) RegisterOption { // nolint: golint,revive
 	return func(o *RegisterOptions) {
 		o.TTL = t
 	}
 }
 
-// nolint: golint,revive
 // RegisterContext sets the register context
-func RegisterContext(ctx context.Context) RegisterOption {
+func RegisterContext(ctx context.Context) RegisterOption { // nolint: golint,revive
 	return func(o *RegisterOptions) {
 		o.Context = ctx
 	}
 }
 
-// nolint: golint,revive
 // RegisterDomain secifies register domain
-func RegisterDomain(d string) RegisterOption {
+func RegisterDomain(d string) RegisterOption { // nolint: golint,revive
 	return func(o *RegisterOptions) {
 		o.Domain = d
 	}

register/register.go

@@ -69,9 +69,8 @@ type Endpoint struct {
 // Option func signature
 type Option func(*Options)
 
-// nolint: golint,revive
 // RegisterOption option is used to register service
-type RegisterOption func(*RegisterOptions)
+type RegisterOption func(*RegisterOptions) // nolint: golint,revive
 
 // WatchOption option is used to watch service changes
 type WatchOption func(*WatchOptions)

tracer/options.go

@@ -2,12 +2,16 @@ package tracer
 
 import "go.unistack.org/micro/v3/logger"
 
+// SpanOptions contains span option
 type SpanOptions struct{}
 
+// SpanOption func signature
 type SpanOption func(o *SpanOptions)
 
+// EventOptions contains event options
 type EventOptions struct{}
 
+// EventOption func signature
 type EventOption func(o *EventOptions)
 
 // Options struct
@@ -18,7 +22,7 @@ type Options struct {
 	Name string
 }
 
-// Option func
+// Option func signature
 type Option func(o *Options)
 
 // Logger sets the logger

util/reflect/path.go

@@ -9,18 +9,30 @@ import (
 )
 
 const (
-	SplitToken     = "."
+	// SplitToken used to detect path components
+	SplitToken = "."
+	// IndexCloseChar used to detect index end
 	IndexCloseChar = "]"
-	IndexOpenChar  = "["
+	// IndexOpenChar used to detect index start
+	IndexOpenChar = "["
 )
 
 var (
-	ErrMalformedIndex    = errors.New("Malformed index key")
-	ErrInvalidIndexUsage = errors.New("Invalid index key usage")
-	ErrKeyNotFound       = errors.New("Unable to find the key")
-	ErrBadJSONPath       = errors.New("Bad path: must start with $ and have more then 2 chars")
+	// ErrMalformedIndex returns when index key have invalid format
+	ErrMalformedIndex = errors.New("malformed index key")
+	// ErrInvalidIndexUsage returns when index key usage error
+	ErrInvalidIndexUsage = errors.New("invalid index key usage")
+	// ErrKeyNotFound returns when key not found
+	ErrKeyNotFound = errors.New("unable to find the key")
+	// ErrBadJSONPath returns when path have invalid syntax
+	ErrBadJSONPath = errors.New("bad path: must start with $ and have more then 2 chars")
 )
 
+// Lookup performs a lookup into a value, using a path of keys. The key should
+// match with a Field or a MapIndex. For slice you can use the syntax key[index]
+// to access a specific index. If one key owns to a slice and an index is not
+// specificied the rest of the path will be apllied to evaley value of the
+// slice, and the value will be merged into a slice.
 func Lookup(i interface{}, path string) (reflect.Value, error) {
 	if path == "" || path[0:1] != "$" {
 		return reflect.Value{}, ErrBadJSONPath
@@ -37,11 +49,6 @@ func Lookup(i interface{}, path string) (reflect.Value, error) {
 	return lookup(i, strings.Split(path[2:], SplitToken)...)
 }
 
-// Lookup performs a lookup into a value, using a path of keys. The key should
-// match with a Field or a MapIndex. For slice you can use the syntax key[index]
-// to access a specific index. If one key owns to a slice and an index is not
-// specificied the rest of the path will be apllied to evaley value of the
-// slice, and the value will be merged into a slice.
 func lookup(i interface{}, path ...string) (reflect.Value, error) {
 	value := reflect.ValueOf(i)
 	var parent reflect.Value

util/reflect/struct.go

@@ -20,8 +20,8 @@ var bracketSplitter = regexp.MustCompile(`\[|\]`)
 
 // StructField contains struct field path its value and field
 type StructField struct {
-	Path  string
 	Value reflect.Value
+	Path  string
 	Field reflect.StructField
 }
 

util/reflect/struct_test.go

@@ -11,13 +11,13 @@ import (
 
 func TestStructfields(t *testing.T) {
 	type Config struct {
-		Wait     time.Duration
 		Time     time.Time
+		Nested   *Config
 		Metadata map[string]int
 		Broker   string
 		Addr     []string
+		Wait     time.Duration
 		Verbose  bool
-		Nested   *Config
 	}
 	cfg := &Config{Nested: &Config{}}
 	fields, err := rutil.StructFields(cfg)