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Fix a concurrency error with Server.listeners
See #134; there was a `fatal error: concurrent map read and map write` due to unsynchronized accesses to `Server.listeners`. Now, `listeners` is only accessed by `NewServer` and `rehash`, so it doesn't need synchronization.
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@ -103,8 +103,7 @@ type Server struct {
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klines *KLineManager
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limits Limits
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listenerEventActMutex sync.Mutex
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listeners map[string]ListenerInterface
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listenerUpdateMutex sync.Mutex
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listeners map[string]*ListenerInterface
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logger *logger.Manager
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MaxSendQBytes uint64
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monitoring map[string][]*Client
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@ -220,7 +219,7 @@ func NewServer(configFilename string, config *Config, logger *logger.Manager) (*
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Rest: config.Limits.LineLen.Rest,
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},
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},
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listeners: make(map[string]ListenerInterface),
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listeners: make(map[string]*ListenerInterface),
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logger: logger,
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MaxSendQBytes: config.Server.MaxSendQBytes,
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monitoring: make(map[string][]*Client),
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@ -316,7 +315,7 @@ func NewServer(configFilename string, config *Config, logger *logger.Manager) (*
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tlsListeners := config.TLSListeners()
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for _, addr := range config.Server.Listen {
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server.createListener(addr, tlsListeners)
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server.listeners[addr] = server.createListener(addr, tlsListeners)
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}
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if len(tlsListeners) == 0 {
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@ -509,14 +508,9 @@ func (server *Server) Run() {
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//
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// createListener starts the given listeners.
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func (server *Server) createListener(addr string, tlsMap map[string]*tls.Config) {
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func (server *Server) createListener(addr string, tlsMap map[string]*tls.Config) *ListenerInterface {
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config, listenTLS := tlsMap[addr]
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_, alreadyExists := server.listeners[addr]
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if alreadyExists {
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log.Fatal(server, "listener already exists:", addr)
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}
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// make listener event channel
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listenerEventChannel := make(chan ListenerEvent, 1)
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@ -538,7 +532,6 @@ func (server *Server) createListener(addr string, tlsMap map[string]*tls.Config)
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Events: listenerEventChannel,
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Listener: listener,
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}
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server.listeners[addr] = li
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// start listening
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server.logger.Info("listeners", fmt.Sprintf("listening on %s using %s.", addr, tlsString))
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@ -558,7 +551,7 @@ func (server *Server) createListener(addr string, tlsMap map[string]*tls.Config)
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}
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select {
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case event := <-server.listeners[addr].Events:
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case event := <-li.Events:
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// this is used to confirm that whoever passed us this event has closed the existing listener correctly (in an attempt to get us to notice the event).
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// this is required to keep REHASH from having a very small race possibility of killing the primary listener
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server.listenerEventActMutex.Lock()
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@ -588,9 +581,6 @@ func (server *Server) createListener(addr string, tlsMap map[string]*tls.Config)
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// update server ListenerInterface
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li.Listener = listener
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server.listenerUpdateMutex.Lock()
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server.listeners[addr] = li
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server.listenerUpdateMutex.Unlock()
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// print notice
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server.logger.Info("listeners", fmt.Sprintf("updated listener %s using %s.", addr, tlsString))
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@ -600,6 +590,8 @@ func (server *Server) createListener(addr string, tlsMap map[string]*tls.Config)
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}
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}
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}()
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return &li
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}
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//
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@ -1651,9 +1643,10 @@ func (server *Server) rehash() error {
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}
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server.clients.ByNickMutex.RUnlock()
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// destroy old listeners
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// update or destroy all existing listeners
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tlsListeners := config.TLSListeners()
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for addr := range server.listeners {
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currentListener := server.listeners[addr]
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var exists bool
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for _, newaddr := range config.Server.Listen {
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if newaddr == addr {
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@ -1665,27 +1658,29 @@ func (server *Server) rehash() error {
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server.listenerEventActMutex.Lock()
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if exists {
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// update old listener
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server.listeners[addr].Events <- ListenerEvent{
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currentListener.Events <- ListenerEvent{
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Type: UpdateListener,
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NewConfig: tlsListeners[addr],
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}
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} else {
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// destroy nonexistent listener
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server.listeners[addr].Events <- ListenerEvent{
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// destroy this listener, since it is no longer in the config
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currentListener.Events <- ListenerEvent{
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Type: DestroyListener,
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}
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delete(server.listeners, addr)
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}
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// force listener to apply the event right away
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server.listeners[addr].Listener.Close()
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// (this causes its Accept() call to return immediately with an error)
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currentListener.Listener.Close()
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server.listenerEventActMutex.Unlock()
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}
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// create new listeners that were not previously configured
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for _, newaddr := range config.Server.Listen {
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_, exists := server.listeners[newaddr]
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if !exists {
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// make new listener
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server.createListener(newaddr, tlsListeners)
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server.listeners[newaddr] = server.createListener(newaddr, tlsListeners)
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}
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}
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