ban: more defaults options, simpler callback

Signed-off-by: Adphi <philippe.adrien.nousse@gmail.com>

example/example.go

@@ -138,7 +138,10 @@ func run(opts ...service.Option) {
 		service.WithMiddlewares(httpLogger),
 		service.WithInterceptors(metrics),
 		service.WithServerInterceptors(
-			ban.NewInterceptors(),
+			ban.NewInterceptors(ban.WithDefaultJailDuration(time.Second), ban.WithDefaultCallback(func(action ban.Action, actor string, rule *ban.Rule) error {
+				log.WithFields("action", action, "actor", actor, "rule", rule.Name).Info("ban callback")
+				return nil
+			})),
 			auth.NewServerInterceptors(auth.WithBasicValidators(func(ctx context.Context, user, password string) (context.Context, error) {
 				if !auth.Equals(user, "admin") || !auth.Equals(password, "admin") {
 					return ctx, fmt.Errorf("invalid user or password")
@@ -187,7 +190,7 @@ func run(opts ...service.Option) {
 	}
 	g := NewGreeterClient(s)
 	h := grpc_health_v1.NewHealthClient(s)
-	for i := 0; i < 4; i++ {
+	for i := 0; i < 5; i++ {
 		_, err := h.Check(ctx, &grpc_health_v1.HealthCheckRequest{})
 		if err != nil {
 			log.Error(err)
@@ -195,6 +198,8 @@ func run(opts ...service.Option) {
 			log.Fatalf("expected error")
 		}
 	}
+	log.Infof("waiting for unban")
+	time.Sleep(time.Second)
 	s, err = client.New(append(copts, client.WithInterceptors(auth.NewBasicAuthClientIntereptors("admin", "admin")))...)
 	if err != nil {
 		log.Fatal(err)

interceptors/ban/ban.go

@@ -27,16 +27,21 @@ func NewInterceptors(opts ...Option) interceptors.ServerInterceptors {
 	rules := make(map[codes.Code]Rule)
 	for _, r := range o.rules {
 		rules[r.Code] = r
+		callback := r.Callback
+		if callback == nil {
+			callback = o.defaultCallback
+		}
+		expire := r.JailDuration
+		if expire == 0 {
+			expire = o.defaultJailDuration
+		}
 		s.AddRule(&badactor.Rule{
 			Name:        r.Name,
 			Message:     r.Message,
 			StrikeLimit: r.StrikeLimit,
-			ExpireBase:  r.ExpireBase,
-			Sentence:    r.Sentence,
-			Action: &action{
-				whenJailed:     r.WhenJailed,
-				whenTimeServed: r.WhenTimeServed,
-			},
+			ExpireBase:  expire,
+			Sentence:    expire,
+			Action:      &action{fn: callback},
 		})
 	}
 	// we ignore the error because CreateDirectors never returns an error

interceptors/ban/options.go

@@ -20,6 +20,8 @@ var (
 		reaperInterval:      10 * time.Minute,
 		rules:               defaultRules,
 		actorFunc:           DefaultActorFunc,
+		defaultCallback:     nil,
+		defaultJailDuration: 10 * time.Second,
 	}
 
 	defaultRules = []Rule{
@@ -28,16 +30,12 @@ var (
 			Message:     "Too many unauthorized requests",
 			Code:        codes.PermissionDenied,
 			StrikeLimit: 3,
-			ExpireBase:  time.Second * 10,
-			Sentence:    time.Second * 10,
 		},
 		{
 			Name:        Unauthenticated,
 			Message:     "Too many unauthenticated requests",
 			Code:        codes.Unauthenticated,
 			StrikeLimit: 3,
-			ExpireBase:  time.Second * 10,
-			Sentence:    time.Second * 10,
 		},
 	}
 )
@@ -79,9 +77,23 @@ func WithActorFunc(f func(context.Context) (name string, found bool, err error))
 	}
 }
 
+func WithDefaultCallback(f ActionCallback) Option {
+	return func(o *options) {
+		o.defaultCallback = f
+	}
+}
+
+func WithDefaultJailDuration(expire time.Duration) Option {
+	return func(o *options) {
+		o.defaultJailDuration = expire
+	}
+}
+
 type options struct {
 	cap                 int32
 	rules               []Rule
 	reaperInterval      time.Duration
 	actorFunc           func(ctx context.Context) (name string, found bool, err error)
+	defaultCallback     ActionCallback
+	defaultJailDuration time.Duration
 }

interceptors/ban/rule.go

@@ -7,46 +7,60 @@ import (
 	"google.golang.org/grpc/codes"
 )
 
+type ActionCallback func(action Action, actor string, rule *Rule) error
+
+type Action int
+
+const (
+	Jailed Action = iota
+	Released
+)
+
+func (a Action) String() string {
+	switch a {
+	case Jailed:
+		return "Jailed"
+	case Released:
+		return "Released"
+	default:
+		return "Unknown"
+	}
+}
+
 type Rule struct {
 	Name         string
 	Message      string
 	Code         codes.Code
 	StrikeLimit  int
-	ExpireBase  time.Duration
-	Sentence    time.Duration
-	// WhenJailed is an optional function to call when an Actor isJailed
-	WhenJailed func(actor string, r *Rule) error
-	// WhenTimeServed is an optional function to call when an Actor is released because of timeServed
-	WhenTimeServed func(actor string, r *Rule) error
+	JailDuration time.Duration
+	// Callback is an optional function to call when an Actor isJailed or released because of timeServed
+	Callback ActionCallback
 }
 
 type action struct {
-	whenJailed     func(actor string, r *Rule) error
-	whenTimeServed func(actor string, r *Rule) error
+	fn ActionCallback
 }
 
 func (a2 *action) WhenJailed(a *badactor.Actor, r *badactor.Rule) error {
-	if a2.whenJailed != nil {
-		return a2.whenJailed(a.Name(), &Rule{
+	if a2.fn == nil {
+		return nil
+	}
+	return a2.fn(Jailed, a.Name(), &Rule{
 		Name:         r.Name,
 		Message:      r.Message,
 		StrikeLimit:  r.StrikeLimit,
-			ExpireBase:  r.ExpireBase,
-			Sentence:    r.Sentence,
+		JailDuration: r.ExpireBase,
 	})
-	}
-	return nil
 }
 
 func (a2 *action) WhenTimeServed(a *badactor.Actor, r *badactor.Rule) error {
-	if a2.whenTimeServed != nil {
-		return a2.whenTimeServed(a.Name(), &Rule{
+	if a2.fn == nil {
+		return nil
+	}
+	return a2.fn(Released, a.Name(), &Rule{
 		Name:         r.Name,
 		Message:      r.Message,
 		StrikeLimit:  r.StrikeLimit,
-			ExpireBase:  r.ExpireBase,
-			Sentence:    r.Sentence,
+		JailDuration: r.ExpireBase,
 	})
-	}
-	return nil
 }