minimize allocations in logger and tunnel code (#1323)

* logs alloc

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

* fix allocs

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

* fix allocs

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

* tunnel allocs

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

* try to fix tunnel

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

* cache cipher for send

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

* more logger

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

* more logger

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

* more logger

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

* more logger

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

* more logger

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

* more logger

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

* more logger

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

subscriber.go

@@ -9,7 +9,7 @@ import (
 
 	"github.com/micro/go-micro/v2/broker"
 	"github.com/micro/go-micro/v2/errors"
-	log "github.com/micro/go-micro/v2/logger"
+	"github.com/micro/go-micro/v2/logger"
 	"github.com/micro/go-micro/v2/metadata"
 	"github.com/micro/go-micro/v2/registry"
 	"github.com/micro/go-micro/v2/server"
@@ -171,8 +171,10 @@ func (g *grpcServer) createSubHandler(sb *subscriber, opts server.Options) broke
 
 		defer func() {
 			if r := recover(); r != nil {
-				log.Error("panic recovered: ", r)
-				log.Error(string(debug.Stack()))
+				if logger.V(logger.ErrorLevel, logger.DefaultLogger) {
+					logger.Error("panic recovered: ", r)
+					logger.Error(string(debug.Stack()))
+				}
 				err = errors.InternalServerError("go.micro.server", "panic recovered: %v", r)
 			}
 		}()