close the server when leaving

chord/httpnode/server.go

@@ -11,8 +11,9 @@ import (
 	"net/http"
 	"net/netip"
 
-	"git.sunturtle.xyz/zephyr/chord/chord"
 	"github.com/go-json-experiment/json"
+
+	"git.sunturtle.xyz/zephyr/chord/chord"
 )
 
 type Node struct {
@@ -22,6 +23,9 @@ type Node struct {
 	// TODO(branden): really we should have a client per peer so that we can
 	// interchange protocols
 	client chord.Client
+	// l is the listener that the HTTP server serves.
+	// When the server leaves, it closes the listener.
+	l net.Listener
 }
 
 // New creates an instance of a Chord network that responds on HTTP.
@@ -39,6 +43,7 @@ func New(l net.Listener, cl chord.Client, self *chord.Node) (*Node, error) {
 	r := &Node{
 		self:   self,
 		client: cl,
+		l:      l,
 	}
 	return r, nil
 }
@@ -165,4 +170,6 @@ func (n *Node) bye(w http.ResponseWriter, r *http.Request) {
 	}
 	n.self.Leave(p, s)
 	w.WriteHeader(http.StatusNoContent)
+	// Close the listener so that the server will shut down.
+	n.l.Close()
 }