Make IPBlockList accessible from Client

client.go

@@ -124,8 +124,12 @@ type Client struct {
 	handshaking int
 
 	torrents map[InfoHash]*torrent
+}
 
-	dataWaits map[*torrent][]dataWait
+func (me *Client) IPBlockList() *iplist.IPList {
+	me.mu.Lock()
+	defer me.mu.Unlock()
+	return me.ipBlockList
 }
 
 func (me *Client) SetIPBlockList(list *iplist.IPList) {

iplist/iplist.go

@@ -28,8 +28,18 @@ func New(initSorted []Range) *IPList {
 	}
 }
 
+func (me *IPList) NumRanges() int {
+	if me == nil {
+		return 0
+	}
+	return len(me.ranges)
+}
+
 // Return the range the given IP is in. Returns nil if no range is found.
 func (me *IPList) Lookup(ip net.IP) (r *Range) {
+	if me == nil {
+		return nil
+	}
 	// Find the index of the first range for which the following range exceeds
 	// it.
 	i := sort.Search(len(me.ranges), func(i int) bool {