add command to manipulate address filters and a sharness test for them

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>

net/filter/filter.go

@@ -9,11 +9,17 @@ import (
 )
 
 type Filters struct {
-	filters []*net.IPNet
+	filters map[string]*net.IPNet
+}
+
+func NewFilters() *Filters {
+	return &Filters{
+		filters: make(map[string]*net.IPNet),
+	}
 }
 
 func (fs *Filters) AddDialFilter(f *net.IPNet) {
-	fs.filters = append(fs.filters, f)
+	fs.filters[f.String()] = f
 }
 
 func (f *Filters) AddrBlocked(a ma.Multiaddr) bool {
@@ -32,3 +38,15 @@ func (f *Filters) AddrBlocked(a ma.Multiaddr) bool {
 	}
 	return false
 }
+
+func (f *Filters) Filters() []*net.IPNet {
+	var out []*net.IPNet
+	for _, ff := range f.filters {
+		out = append(out, ff)
+	}
+	return out
+}
+
+func (f *Filters) Remove(ff *net.IPNet) {
+	delete(f.filters, ff.String())
+}

net/swarm/swarm.go

@@ -84,7 +84,7 @@ func NewSwarm(ctx context.Context, listenAddrs []ma.Multiaddr,
 		dialT:   DialTimeout,
 		notifs:  make(map[inet.Notifiee]ps.Notifiee),
 		bwc:     bwc,
-		Filters: new(filter.Filters),
+		Filters: filter.NewFilters(),
 	}
 
 	// configure Swarm