Use a real reverse function

cmd/server/memory.go

@@ -23,6 +23,7 @@ import (
 	"fmt"
 	"log"
 	"os"
+	"reflect"
 	"sort"
 	"strings"
 
@@ -202,7 +203,7 @@ func (b *memoryBackend) TimelineGet(after, before, channel string) microsub.Time
 		return strings.Compare(timeA, timeB) > 0
 	})
 
-	items := sort.Reverse(items)
+	reverseSlice(items)
 
 	return microsub.Timeline{
 		Paging: microsub.Pagination{},
@@ -210,6 +211,15 @@ func (b *memoryBackend) TimelineGet(after, before, channel string) microsub.Time
 	}
 }
 
+//panic if s is not a slice
+func reverseSlice(s interface{}) {
+	size := reflect.ValueOf(s).Len()
+	swap := reflect.Swapper(s)
+	for i, j := 0, size-1; i < j; i, j = i+1, j-1 {
+		swap(i, j)
+	}
+}
+
 func (b *memoryBackend) checkRead(channel string, uid string) bool {
 	args := redis.Args{}.Add(fmt.Sprintf("timeline:%s:read", channel)).Add(uid)
 	member, err := redis.Bool(b.Redis.Do("SISMEMBER", args...))