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Merge pull request #135 from slingamn/listeners_refactor_again.7
refactor create/update/destroy of listeners
This commit is contained in:
Daniel Oaks
GitHub
commit
989fea18f9
@ -368,6 +368,7 @@ func (conf *Config) TLSListeners() map[string]*tls.Config {
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tlsListeners := make(map[string]*tls.Config)
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for s, tlsListenersConf := range conf.Server.TLSListeners {
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config, err := tlsListenersConf.Config()
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config.ClientAuth = tls.RequestClientCert
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if err != nil {
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log.Fatal(err)
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}
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191
irc/server.go
191
irc/server.go
@ -57,26 +57,15 @@ type LineLenLimits struct {
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Rest int
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}
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// ListenerInterface represents an interface for a listener.
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type ListenerInterface struct {
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Listener net.Listener
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Events chan ListenerEvent
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}
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const (
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// DestroyListener instructs the listener to destroy itself.
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DestroyListener ListenerEventType = iota
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// UpdateListener instructs the listener to update itself (grab new certs, etc).
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UpdateListener = iota
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)
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// ListenerEventType is the type of event this is.
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type ListenerEventType int
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// ListenerEvent is an event that's passed to the listener.
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type ListenerEvent struct {
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Type ListenerEventType
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NewConfig *tls.Config
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// ListenerWrapper wraps a listener so it can be safely reconfigured or stopped
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type ListenerWrapper struct {
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listener net.Listener
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tlsConfig *tls.Config
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shouldStop bool
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// lets the ListenerWrapper inform the server that it has stopped:
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stopEvent chan bool
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// protects atomic update of tlsConfig and shouldStop:
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configMutex sync.Mutex
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}
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// Server is the main Oragono server.
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@ -102,9 +91,7 @@ type Server struct {
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isupport *ISupportList
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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]*ListenerWrapper
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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 +207,7 @@ 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]*ListenerWrapper),
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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 +303,7 @@ 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[addr])
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}
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if len(tlsListeners) == 0 {
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@ -437,10 +424,12 @@ func (server *Server) Run() {
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case <-server.rehashSignal:
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server.logger.Info("rehash", "Rehashing due to SIGHUP")
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err := server.rehash()
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if err != nil {
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server.logger.Error("rehash", fmt.Sprintln("Failed to rehash:", err.Error()))
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}
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go func() {
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err := server.rehash()
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if err != nil {
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server.logger.Error("rehash", fmt.Sprintln("Failed to rehash:", err.Error()))
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}
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}()
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case conn := <-server.newConns:
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// check connection limits
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@ -509,97 +498,63 @@ 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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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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func (server *Server) createListener(addr string, tlsConfig *tls.Config) *ListenerWrapper {
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// make listener
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listener, err := net.Listen("tcp", addr)
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if err != nil {
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log.Fatal(server, "listen error: ", err)
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}
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// throw our details to the server so we can be modified/killed later
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wrapper := ListenerWrapper{
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listener: listener,
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tlsConfig: tlsConfig,
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shouldStop: false,
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stopEvent: make(chan bool, 1),
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}
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// TODO(slingamn) move all logging of listener status to rehash()
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tlsString := "plaintext"
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if listenTLS {
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config.ClientAuth = tls.RequestClientCert
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listener = tls.NewListener(listener, config)
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if tlsConfig != nil {
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tlsString = "TLS"
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}
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// throw our details to the server so we can be modified/killed later
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li := ListenerInterface{
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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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var shouldStop bool
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// setup accept goroutine
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go func() {
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for {
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conn, err := listener.Accept()
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// synchronously access config data:
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// whether TLS is enabled and whether we should stop listening
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wrapper.configMutex.Lock()
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shouldStop = wrapper.shouldStop
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tlsConfig = wrapper.tlsConfig
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wrapper.configMutex.Unlock()
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if err == nil {
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if tlsConfig != nil {
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conn = tls.Server(conn, tlsConfig)
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}
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newConn := clientConn{
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Conn: conn,
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IsTLS: listenTLS,
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IsTLS: tlsConfig != nil,
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}
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// hand off the connection
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server.newConns <- newConn
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}
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select {
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case event := <-server.listeners[addr].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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server.listenerEventActMutex.Unlock()
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if event.Type == DestroyListener {
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// listener should already be closed, this is just for safety
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listener.Close()
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return
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} else if event.Type == UpdateListener {
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// close old listener
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listener.Close()
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// make new listener
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listener, err = net.Listen("tcp", addr)
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if err != nil {
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log.Fatal(server, "listen error: ", err)
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}
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tlsString := "plaintext"
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if event.NewConfig != nil {
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config = event.NewConfig
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config.ClientAuth = tls.RequestClientCert
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listener = tls.NewListener(listener, config)
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tlsString = "TLS"
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}
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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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}
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default:
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// no events waiting for us, fall-through and continue
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if shouldStop {
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listener.Close()
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wrapper.stopEvent <- true
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return
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}
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}
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}()
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return &wrapper
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}
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//
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@ -1651,41 +1606,49 @@ 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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var exists bool
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currentListener := server.listeners[addr]
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var stillConfigured bool
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for _, newaddr := range config.Server.Listen {
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if newaddr == addr {
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exists = true
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stillConfigured = true
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break
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}
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}
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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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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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Type: DestroyListener,
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}
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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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// pass new config information to the listener, to be picked up after
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// its next Accept(). this is like sending over a buffered channel of
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// size 1, but where sending a second item overwrites the buffered item
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// instead of blocking.
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currentListener.configMutex.Lock()
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currentListener.shouldStop = !stillConfigured
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currentListener.tlsConfig = tlsListeners[addr]
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currentListener.configMutex.Unlock()
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server.listenerEventActMutex.Unlock()
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if stillConfigured {
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server.logger.Info("rehash",
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fmt.Sprintf("now listening on %s, tls=%t.", addr, (currentListener.tlsConfig != nil)),
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)
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} else {
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// tell the listener it should stop by interrupting its Accept() call:
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currentListener.listener.Close()
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// XXX there is no guarantee from the API when the address will actually
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// free for bind(2) again; this solution "seems to work". See here:
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// https://github.com/golang/go/issues/21833
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<-currentListener.stopEvent
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delete(server.listeners, addr)
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server.logger.Info("rehash", fmt.Sprintf("stopped listening on %s.", addr))
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}
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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[newaddr])
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}
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}
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