server: stop sub systems in case of server failed to start.
In this commit every succesfull started sub system is tracked and in case of a failure to complete the Start function all these sub systems are stopped using a generic cleanup function.
This commit is contained in:
Roei Erez
parent
3223df74e5
commit
becae748de
140
server.go
140
server.go
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@ -1432,17 +1432,45 @@ func (s *server) Started() bool {
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return atomic.LoadInt32(&s.active) != 0
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}
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// cleaner is used to aggregate "cleanup" functions during an operation that
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// starts several subsystems. In case one of the subsystem fails to start
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// and a proper resource cleanup is required, the "run" method achieves this
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// by running all these added "cleanup" functions
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type cleaner []func() error
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// add is used to add a cleanup function to be called when
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// the run function is executed
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func (c cleaner) add(cleanup func() error) cleaner {
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return append(c, cleanup)
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}
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// run is used to run all the previousely added cleanup functions
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func (c cleaner) run() {
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for i := len(c) - 1; i >= 0; i-- {
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if err := c[i](); err != nil {
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srvrLog.Infof("Cleanup failed: %v", err)
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}
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}
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}
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// Start starts the main daemon server, all requested listeners, and any helper
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// goroutines.
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// NOTE: This function is safe for concurrent access.
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func (s *server) Start() error {
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var startErr error
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// If one sub system fails to start, the following code ensures that the
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// previous started ones are stopped. It also ensures a proper wallet
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// shutdown which is important for releasing its resources (boltdb, etc...)
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cleanup := cleaner{}
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s.start.Do(func() {
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if s.torController != nil {
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if err := s.createNewHiddenService(); err != nil {
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startErr = err
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return
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}
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cleanup = cleanup.add(s.torController.Stop)
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}
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if s.natTraversal != nil {
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@ -1455,6 +1483,7 @@ func (s *server) Start() error {
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startErr = err
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return
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}
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cleanup = cleanup.add(s.hostAnn.Stop)
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}
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if s.livelinessMonitor != nil {
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@ -1462,6 +1491,7 @@ func (s *server) Start() error {
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startErr = err
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return
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}
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cleanup = cleanup.add(s.livelinessMonitor.Stop)
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}
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// Start the notification server. This is used so channel
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@ -1473,91 +1503,134 @@ func (s *server) Start() error {
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startErr = err
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return
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}
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cleanup = cleanup.add(s.sigPool.Stop)
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if err := s.writePool.Start(); err != nil {
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startErr = err
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return
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}
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cleanup = cleanup.add(s.writePool.Stop)
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if err := s.readPool.Start(); err != nil {
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startErr = err
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return
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}
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cleanup = cleanup.add(s.readPool.Stop)
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if err := s.cc.ChainNotifier.Start(); err != nil {
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startErr = err
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return
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}
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cleanup = cleanup.add(s.cc.ChainNotifier.Stop)
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if err := s.channelNotifier.Start(); err != nil {
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startErr = err
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return
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}
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cleanup = cleanup.add(s.channelNotifier.Stop)
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if err := s.peerNotifier.Start(); err != nil {
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startErr = err
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return
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}
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cleanup = cleanup.add(func() error {
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return s.peerNotifier.Stop()
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})
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if err := s.htlcNotifier.Start(); err != nil {
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startErr = err
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return
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}
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cleanup = cleanup.add(s.htlcNotifier.Stop)
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if err := s.sphinx.Start(); err != nil {
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startErr = err
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return
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}
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cleanup = cleanup.add(s.sphinx.Stop)
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if s.towerClient != nil {
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if err := s.towerClient.Start(); err != nil {
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startErr = err
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return
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}
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cleanup = cleanup.add(s.towerClient.Stop)
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}
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if s.anchorTowerClient != nil {
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if err := s.anchorTowerClient.Start(); err != nil {
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startErr = err
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return
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}
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cleanup = cleanup.add(s.anchorTowerClient.Stop)
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}
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if err := s.htlcSwitch.Start(); err != nil {
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startErr = err
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return
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}
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cleanup = cleanup.add(s.htlcSwitch.Stop)
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if err := s.sweeper.Start(); err != nil {
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startErr = err
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return
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}
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cleanup = cleanup.add(s.sweeper.Stop)
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if err := s.utxoNursery.Start(); err != nil {
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startErr = err
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return
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}
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cleanup = cleanup.add(s.utxoNursery.Stop)
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if err := s.chainArb.Start(); err != nil {
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startErr = err
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return
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}
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cleanup = cleanup.add(s.chainArb.Stop)
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if err := s.breachArbiter.Start(); err != nil {
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startErr = err
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return
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}
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cleanup = cleanup.add(s.breachArbiter.Stop)
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if err := s.authGossiper.Start(); err != nil {
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startErr = err
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return
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}
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cleanup = cleanup.add(s.authGossiper.Stop)
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if err := s.chanRouter.Start(); err != nil {
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startErr = err
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return
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}
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cleanup = cleanup.add(s.chanRouter.Stop)
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if err := s.fundingMgr.Start(); err != nil {
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startErr = err
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return
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}
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cleanup = cleanup.add(s.fundingMgr.Stop)
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if err := s.invoices.Start(); err != nil {
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startErr = err
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return
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}
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cleanup = cleanup.add(s.invoices.Stop)
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if err := s.chanStatusMgr.Start(); err != nil {
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startErr = err
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return
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}
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cleanup = cleanup.add(s.chanStatusMgr.Stop)
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if err := s.chanEventStore.Start(); err != nil {
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startErr = err
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return
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}
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cleanup = cleanup.add(func() error {
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s.chanEventStore.Stop()
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return nil
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})
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// Before we start the connMgr, we'll check to see if we have
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// any backups to recover. We do this now as we want to ensure
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@ -1595,8 +1668,13 @@ func (s *server) Start() error {
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startErr = err
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return
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}
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cleanup = cleanup.add(s.chanSubSwapper.Stop)
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s.connMgr.Start()
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cleanup = cleanup.add(func() error {
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s.connMgr.Stop()
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return nil
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})
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// With all the relevant sub-systems started, we'll now attempt
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// to establish persistent connections to our direct channel
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@ -1689,6 +1767,9 @@ func (s *server) Start() error {
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atomic.StoreInt32(&s.active, 1)
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})
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if startErr != nil {
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cleanup.run()
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}
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return startErr
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}
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@ -1707,30 +1788,49 @@ func (s *server) Stop() error {
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if err := s.cc.ChainNotifier.Stop(); err != nil {
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srvrLog.Warnf("Unable to stop ChainNotifier: %v", err)
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}
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s.chanRouter.Stop()
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s.htlcSwitch.Stop()
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s.sphinx.Stop()
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s.utxoNursery.Stop()
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s.breachArbiter.Stop()
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s.authGossiper.Stop()
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s.chainArb.Stop()
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s.sweeper.Stop()
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s.channelNotifier.Stop()
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s.peerNotifier.Stop()
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s.htlcNotifier.Stop()
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if err := s.cc.Wallet.Shutdown(); err != nil {
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srvrLog.Warnf("Unable to stop Wallet: %v", err)
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if err := s.chanRouter.Stop(); err != nil {
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srvrLog.Warnf("failed to stop chanRouter: %v", err)
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}
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if err := s.cc.ChainView.Stop(); err != nil {
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srvrLog.Warnf("Unable to stop ChainView: %v", err)
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if err := s.htlcSwitch.Stop(); err != nil {
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srvrLog.Warnf("failed to stop htlcSwitch: %v", err)
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}
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if err := s.sphinx.Stop(); err != nil {
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srvrLog.Warnf("failed to stop sphinx: %v", err)
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}
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if err := s.utxoNursery.Stop(); err != nil {
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srvrLog.Warnf("failed to stop utxoNursery: %v", err)
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}
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if err := s.breachArbiter.Stop(); err != nil {
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srvrLog.Warnf("failed to stop breachArbiter: %v", err)
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}
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if err := s.authGossiper.Stop(); err != nil {
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srvrLog.Warnf("failed to stop authGossiper: %v", err)
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}
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if err := s.chainArb.Stop(); err != nil {
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srvrLog.Warnf("failed to stop chainArb: %v", err)
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}
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if err := s.sweeper.Stop(); err != nil {
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srvrLog.Warnf("failed to stop sweeper: %v", err)
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}
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if err := s.channelNotifier.Stop(); err != nil {
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srvrLog.Warnf("failed to stop channelNotifier: %v", err)
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}
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if err := s.peerNotifier.Stop(); err != nil {
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srvrLog.Warnf("failed to stop peerNotifier: %v", err)
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}
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if err := s.htlcNotifier.Stop(); err != nil {
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srvrLog.Warnf("failed to stop htlcNotifier: %v", err)
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}
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s.connMgr.Stop()
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if err := s.cc.FeeEstimator.Stop(); err != nil {
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srvrLog.Warnf("Unable to stop FeeEstimator: %v", err)
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if err := s.invoices.Stop(); err != nil {
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srvrLog.Warnf("failed to stop invoices: %v", err)
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}
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if err := s.fundingMgr.Stop(); err != nil {
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srvrLog.Warnf("failed to stop fundingMgr: %v", err)
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}
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if err := s.chanSubSwapper.Stop(); err != nil {
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srvrLog.Warnf("failed to stop chanSubSwapper: %v", err)
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}
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s.invoices.Stop()
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s.fundingMgr.Stop()
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s.chanSubSwapper.Stop()
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s.chanEventStore.Stop()
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// Disconnect from each active peers to ensure that
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