Simple refactor, better Go style

store/server.go

@@ -23,22 +23,18 @@ func NewServer(id, addr string, voter bool) *Server {
 // Servers is a set of Servers.
 type Servers []*Server
 
-func (s Servers) Less(i, j int) bool { return s[i].ID < s[j].ID }
-func (s Servers) Len() int           { return len(s) }
-func (s Servers) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
-
 // IsReadOnly returns whether the given node, as specified by its Raft ID,
 // is a read-only (non-voting) node. If no node is found with the given ID
 // then found will be false.
-func IsReadOnly(servers []*Server, id string) (readOnly bool, found bool) {
+func (s Servers) IsReadOnly(id string) (readOnly bool, found bool) {
 	readOnly = false
 	found = false
 
-	if servers == nil || id == "" {
+	if s == nil || id == "" {
 		return
 	}
 
-	for _, n := range servers {
+	for _, n := range s {
 		if n != nil && n.ID == id {
 			readOnly = n.Suffrage == "Nonvoter"
 			found = true
@@ -47,3 +43,7 @@ func IsReadOnly(servers []*Server, id string) (readOnly bool, found bool) {
 	}
 	return
 }
+
+func (s Servers) Less(i, j int) bool { return s[i].ID < s[j].ID }
+func (s Servers) Len() int           { return len(s) }
+func (s Servers) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }

store/server_test.go

@@ -5,41 +5,42 @@ import (
 )
 
 func Test_IsReadOnly(t *testing.T) {
-	var servers []*Server
+	var servers Servers
 
-	if _, found := IsReadOnly(nil, "1"); found {
+	if _, found := servers.IsReadOnly("1"); found {
 		t.Fatalf("found should be false")
 	}
 
-	servers = make([]*Server, 1)
-	if _, found := IsReadOnly(servers, ""); found {
+	nodes := make([]*Server, 1)
+	servers = Servers(nodes)
+	if _, found := servers.IsReadOnly(""); found {
 		t.Fatalf("found should be false")
 	}
-	if _, found := IsReadOnly(servers, "node1"); found {
+	if _, found := servers.IsReadOnly("node1"); found {
 		t.Fatalf("found should be false")
 	}
-	servers[0] = &Server{
+	nodes[0] = &Server{
 		ID:       "node1",
 		Addr:     "localhost:4002",
 		Suffrage: "Voter",
 	}
-	if ro, found := IsReadOnly(servers, "node1"); ro || !found {
+	if ro, found := servers.IsReadOnly("node1"); ro || !found {
 		t.Fatalf("IsReadOnly returned ro: %t, found: %t", ro, found)
 	}
-	servers[0] = &Server{
+	nodes[0] = &Server{
 		ID:       "node1",
 		Addr:     "localhost:4002",
 		Suffrage: "Voter",
 	}
-	if ro, found := IsReadOnly(servers, "node2"); found {
+	if ro, found := servers.IsReadOnly("node2"); found {
 		t.Fatalf("IsReadOnly returned ro: %t, found: %t", ro, found)
 	}
-	servers[0] = &Server{
+	nodes[0] = &Server{
 		ID:       "node1",
 		Addr:     "localhost:4002",
 		Suffrage: "Nonvoter",
 	}
-	if ro, found := IsReadOnly(servers, "node1"); !ro || !found {
-		t.Fatalf("IsReadOnly returned ro: %t, found: %t", ro, found)
+	if ro, found := servers.IsReadOnly("node1"); !ro || !found {
+		t.Fatalf("servers.IsReadOnly returned ro: %t, found: %t", ro, found)
 	}
 }

store/store.go

@@ -1355,11 +1355,11 @@ func (s *Store) observe() (closeCh, doneCh chan struct{}) {
 					if err != nil {
 						s.logger.Printf("failed to get nodes configuration during reap check: %s", err.Error())
 					}
-
+					servers := Servers(nodes)
 					id := string(signal.PeerID)
 					dur := time.Since(signal.LastContact)
 
-					isReadOnly, found := IsReadOnly(nodes, id)
+					isReadOnly, found := servers.IsReadOnly(id)
 					if !found {
 						s.logger.Printf("node %s is not present in configuration", id)
 						break