feat(discovery): provide an option to disable discovery debug log (#1942)

* feat(discovery): provide an option to disable discovery resolver one debug-like log

* styl: re-sort imports

* styl: rename option function name and comment

transport/grpc/resolver/discovery/builder.go

@@ -8,6 +8,7 @@ import (
 
 	"github.com/go-kratos/kratos/v2/log"
 	"github.com/go-kratos/kratos/v2/registry"
+
 	"google.golang.org/grpc/resolver"
 )
 
@@ -37,11 +38,19 @@ func WithInsecure(insecure bool) Option {
 	}
 }
 
+// DisableDebugLog disables update instances log.
+func DisableDebugLog() Option {
+	return func(b *builder) {
+		b.debugLogDisabled = true
+	}
+}
+
 type builder struct {
 	discoverer       registry.Discovery
 	logger           log.Logger
 	timeout          time.Duration
 	insecure         bool
+	debugLogDisabled bool
 }
 
 // NewBuilder creates a builder which is used to factory registry resolvers.
@@ -51,6 +60,7 @@ func NewBuilder(d registry.Discovery, opts ...Option) resolver.Builder {
 		logger:           log.GetLogger(),
 		timeout:          time.Second * 10,
 		insecure:         false,
+		debugLogDisabled: false,
 	}
 	for _, o := range opts {
 		o(b)
@@ -85,6 +95,7 @@ func (b *builder) Build(target resolver.Target, cc resolver.ClientConn, opts res
 		cancel:           cancel,
 		log:              log.NewHelper(b.logger),
 		insecure:         b.insecure,
+		debugLogDisabled: b.debugLogDisabled,
 	}
 	go r.watch()
 	return r, nil

transport/grpc/resolver/discovery/resolver.go

@@ -9,6 +9,7 @@ import (
 	"github.com/go-kratos/kratos/v2/internal/endpoint"
 	"github.com/go-kratos/kratos/v2/log"
 	"github.com/go-kratos/kratos/v2/registry"
+
 	"google.golang.org/grpc/attributes"
 	"google.golang.org/grpc/resolver"
 )
@@ -22,6 +23,7 @@ type discoveryResolver struct {
 	cancel context.CancelFunc
 
 	insecure         bool
+	debugLogDisabled bool
 }
 
 func (r *discoveryResolver) watch() {
@@ -77,9 +79,12 @@ func (r *discoveryResolver) update(ins []*registry.ServiceInstance) {
 	if err != nil {
 		r.log.Errorf("[resolver] failed to update state: %s", err)
 	}
+
+	if !r.debugLogDisabled {
 		b, _ := json.Marshal(ins)
 		r.log.Infof("[resolver] update instances: %s", b)
 	}
+}
 
 func (r *discoveryResolver) Close() {
 	r.cancel()