Streams tenancy (#91)

* fixup streams stuff

* use cache instead of pg in streams

* hash out issuer streams test

* fix compile error

streams/handler/handler.go

@@ -7,8 +7,7 @@ import (
 	"github.com/micro/micro/v3/service/auth"
 	"github.com/micro/micro/v3/service/errors"
 	"github.com/micro/micro/v3/service/events"
-	gorm2 "github.com/micro/services/pkg/gorm"
-
+	"github.com/micro/services/pkg/cache"
 	"github.com/nats-io/nats-streaming-server/util"
 )
 
@@ -24,18 +23,22 @@ var (
 )
 
 type Token struct {
-	Token     string `gorm:"primaryKey"`
+	Token     string
 	Topic     string
 	Account   string
 	ExpiresAt time.Time
 }
 
 type Streams struct {
-	gorm2.Helper
+	Cache  cache.Cache
 	Events events.Stream
 	Time   func() time.Time
 }
 
+func (t *Token) Key() string {
+	return fmt.Sprintf("%s:%s", t.Account, t.Token)
+}
+
 func getAccount(acc *auth.Account) string {
 	owner := acc.Metadata["apikey_owner"]
 	if len(owner) == 0 {