Add docs around WithAllowlistedMultiaddrs. Expose allowlist

allowlist_test.go

@@ -11,6 +11,29 @@ import (
 	"github.com/multiformats/go-multiaddr"
 )
 
+func ExampleWithAllowlistedMultiaddrs() {
+	somePeer, err := test.RandPeerID()
+	if err != nil {
+		panic("Failed to generate somePeer")
+	}
+
+	limits := DefaultLimits.AutoScale()
+	rcmgr, err := NewResourceManager(NewFixedLimiter(limits), WithAllowlistedMultiaddrs([]multiaddr.Multiaddr{
+		// Any peer connecting from this IP address
+		multiaddr.StringCast("/ip4/1.2.3.4"),
+		// Only the specified peer from this address
+		multiaddr.StringCast("/ip4/2.2.3.4/p2p/" + peer.Encode(somePeer)),
+		// Only peers from this 1.2.3.0/24 IP address range
+		multiaddr.StringCast("/ip4/1.2.3.0/ipcidr/24"),
+	}))
+	if err != nil {
+		panic("Failed to start resource manager")
+	}
+
+	// Use rcmgr as before
+	_ = rcmgr
+}
+
 func TestAllowedSimple(t *testing.T) {
 	allowlist := newAllowlist()
 	ma := multiaddr.StringCast("/ip4/1.2.3.4/tcp/1234")

rcmgr.go

@@ -167,6 +167,18 @@ func (r *resourceManager) GetAllowlist() *Allowlist {
 	return r.allowlist
 }
 
+// GetAllowlist tries to get the allowlist from the given resourcemanager
+// interface by checking to see if its concrete type is a resourceManager.
+// Returns nil if it fails to get the allowlist.
+func GetAllowlist(rcmgr network.ResourceManager) *Allowlist {
+	r, ok := rcmgr.(*resourceManager)
+	if !ok {
+		return nil
+	}
+
+	return r.allowlist
+}
+
 func (r *resourceManager) ViewSystem(f func(network.ResourceScope) error) error {
 	return f(r.system)
 }

rcmgr_test.go

@@ -1005,6 +1005,11 @@ func TestResourceManagerWithAllowlist(t *testing.T) {
 		t.Fatal(err)
 	}
 
+	ableToGetAllowlist := GetAllowlist(rcmgr)
+	if ableToGetAllowlist == nil {
+		t.Fatal("Expected to be able to get the allowlist")
+	}
+
 	// A connection comes in from a non-allowlisted ip address
 	_, err = rcmgr.OpenConnection(network.DirInbound, true, multiaddr.StringCast("/ip4/1.2.3.5"))
 	if err == nil {