all: sync with master; upd chlog

internal/home/clients.go

@@ -378,6 +378,7 @@ func (clients *clientsContainer) clientOrArtificial(
 	}, true
 }
 
+// Find returns a shallow copy of the client if there is one found.
 func (clients *clientsContainer) Find(id string) (c *Client, ok bool) {
 	clients.lock.Lock()
 	defer clients.lock.Unlock()
@@ -387,20 +388,18 @@ func (clients *clientsContainer) Find(id string) (c *Client, ok bool) {
 		return nil, false
 	}
 
-	c.IDs = stringutil.CloneSlice(c.IDs)
-	c.Tags = stringutil.CloneSlice(c.Tags)
-	c.BlockedServices = stringutil.CloneSlice(c.BlockedServices)
-	c.Upstreams = stringutil.CloneSlice(c.Upstreams)
-
-	return c, true
+	return c.ShallowClone(), true
 }
 
 // shouldCountClient is a wrapper around Find to make it a valid client
 // information finder for the statistics.  If no information about the client
 // is found, it returns true.
 func (clients *clientsContainer) shouldCountClient(ids []string) (y bool) {
+	clients.lock.Lock()
+	defer clients.lock.Unlock()
+
 	for _, id := range ids {
-		client, ok := clients.Find(id)
+		client, ok := clients.findLocked(id)
 		if ok {
 			return !client.IgnoreStatistics
 		}
@@ -617,6 +616,15 @@ func (clients *clientsContainer) Add(c *Client) (ok bool, err error) {
 		}
 	}
 
+	clients.add(c)
+
+	log.Debug("clients: added %q: ID:%q [%d]", c.Name, c.IDs, len(clients.list))
+
+	return true, nil
+}
+
+// add c to the indexes. clients.lock is expected to be locked.
+func (clients *clientsContainer) add(c *Client) {
 	// update Name index
 	clients.list[c.Name] = c
 
@@ -624,10 +632,6 @@ func (clients *clientsContainer) Add(c *Client) (ok bool, err error) {
 	for _, id := range c.IDs {
 		clients.idIndex[id] = c
 	}
-
-	log.Debug("clients: added %q: ID:%q [%d]", c.Name, c.IDs, len(clients.list))
-
-	return true, nil
 }
 
 // Del removes a client.  ok is false if there is no such client.
@@ -645,86 +649,53 @@ func (clients *clientsContainer) Del(name string) (ok bool) {
 		log.Error("client container: removing client %s: %s", name, err)
 	}
 
+	clients.del(c)
+
+	return true
+}
+
+// del removes c from the indexes. clients.lock is expected to be locked.
+func (clients *clientsContainer) del(c *Client) {
 	// update Name index
-	delete(clients.list, name)
+	delete(clients.list, c.Name)
 
 	// update ID index
 	for _, id := range c.IDs {
 		delete(clients.idIndex, id)
 	}
-
-	return true
 }
 
 // Update updates a client by its name.
-func (clients *clientsContainer) Update(name string, c *Client) (err error) {
+func (clients *clientsContainer) Update(prev, c *Client) (err error) {
 	err = clients.check(c)
 	if err != nil {
+		// Don't wrap the error since it's informative enough as is.
 		return err
 	}
 
 	clients.lock.Lock()
 	defer clients.lock.Unlock()
 
-	prev, ok := clients.list[name]
-	if !ok {
-		return errors.Error("client not found")
-	}
-
-	// First, check the name index.
+	// Check the name index.
 	if prev.Name != c.Name {
-		_, ok = clients.list[c.Name]
+		_, ok := clients.list[c.Name]
 		if ok {
 			return errors.Error("client already exists")
 		}
 	}
 
-	// Second, update the ID index.
-	err = clients.updateIDIndex(prev, c.IDs)
-	if err != nil {
-		// Don't wrap the error, because it's informative enough as is.
-		return err
-	}
-
-	// Update name index.
-	if prev.Name != c.Name {
-		delete(clients.list, prev.Name)
-		clients.list[c.Name] = prev
-	}
-
-	// Update upstreams cache.
-	err = c.closeUpstreams()
-	if err != nil {
-		return err
-	}
-
-	*prev = *c
-
-	return nil
-}
-
-// updateIDIndex updates the ID index data for cli using the information from
-// newIDs.
-func (clients *clientsContainer) updateIDIndex(cli *Client, newIDs []string) (err error) {
-	if slices.Equal(cli.IDs, newIDs) {
-		return nil
-	}
-
-	for _, id := range newIDs {
-		existing, ok := clients.idIndex[id]
-		if ok && existing != cli {
-			return fmt.Errorf("id %q is used by client with name %q", id, existing.Name)
+	// Check the ID index.
+	if !slices.Equal(prev.IDs, c.IDs) {
+		for _, id := range c.IDs {
+			existing, ok := clients.idIndex[id]
+			if ok && existing != prev {
+				return fmt.Errorf("id %q is used by client with name %q", id, existing.Name)
+			}
 		}
 	}
 
-	// Update the IDs in the index.
-	for _, id := range cli.IDs {
-		delete(clients.idIndex, id)
-	}
-
-	for _, id := range newIDs {
-		clients.idIndex[id] = cli
-	}
+	clients.del(prev)
+	clients.add(c)
 
 	return nil
 }