package libnetwork import ( "fmt" "strings" "github.com/docker/docker/libnetwork/datastore" "github.com/docker/libkv/store/boltdb" "github.com/docker/libkv/store/consul" "github.com/docker/libkv/store/etcd" "github.com/docker/libkv/store/zookeeper" "github.com/sirupsen/logrus" ) func registerKVStores() { consul.Register() zookeeper.Register() etcd.Register() boltdb.Register() } func (c *controller) initScopedStore(scope string, scfg *datastore.ScopeCfg) error { store, err := datastore.NewDataStore(scope, scfg) if err != nil { return err } c.Lock() c.stores = append(c.stores, store) c.Unlock() return nil } func (c *controller) initStores() error { registerKVStores() c.Lock() if c.cfg == nil { c.Unlock() return nil } scopeConfigs := c.cfg.Scopes c.stores = nil c.Unlock() for scope, scfg := range scopeConfigs { if err := c.initScopedStore(scope, scfg); err != nil { return err } } c.startWatch() return nil } func (c *controller) closeStores() { for _, store := range c.getStores() { store.Close() } } func (c *controller) getStore(scope string) datastore.DataStore { c.Lock() defer c.Unlock() for _, store := range c.stores { if store.Scope() == scope { return store } } return nil } func (c *controller) getStores() []datastore.DataStore { c.Lock() defer c.Unlock() return c.stores } func (c *controller) getNetworkFromStore(nid string) (*network, error) { for _, n := range c.getNetworksFromStore() { if n.id == nid { return n, nil } } return nil, ErrNoSuchNetwork(nid) } func (c *controller) getNetworksForScope(scope string) ([]*network, error) { var nl []*network store := c.getStore(scope) if store == nil { return nil, nil } kvol, err := store.List(datastore.Key(datastore.NetworkKeyPrefix), &network{ctrlr: c}) if err != nil && err != datastore.ErrKeyNotFound { return nil, fmt.Errorf("failed to get networks for scope %s: %v", scope, err) } for _, kvo := range kvol { n := kvo.(*network) n.ctrlr = c ec := &endpointCnt{n: n} err = store.GetObject(datastore.Key(ec.Key()...), ec) if err != nil && !n.inDelete { logrus.Warnf("Could not find endpoint count key %s for network %s while listing: %v", datastore.Key(ec.Key()...), n.Name(), err) continue } n.epCnt = ec if n.scope == "" { n.scope = scope } nl = append(nl, n) } return nl, nil } func (c *controller) getNetworksFromStore() []*network { var nl []*network for _, store := range c.getStores() { kvol, err := store.List(datastore.Key(datastore.NetworkKeyPrefix), &network{ctrlr: c}) // Continue searching in the next store if no keys found in this store if err != nil { if err != datastore.ErrKeyNotFound { logrus.Debugf("failed to get networks for scope %s: %v", store.Scope(), err) } continue } kvep, err := store.Map(datastore.Key(epCntKeyPrefix), &endpointCnt{}) if err != nil && err != datastore.ErrKeyNotFound { logrus.Warnf("failed to get endpoint_count map for scope %s: %v", store.Scope(), err) } for _, kvo := range kvol { n := kvo.(*network) n.Lock() n.ctrlr = c ec := &endpointCnt{n: n} // Trim the leading & trailing "/" to make it consistent across all stores if val, ok := kvep[strings.Trim(datastore.Key(ec.Key()...), "/")]; ok { ec = val.(*endpointCnt) ec.n = n n.epCnt = ec } if n.scope == "" { n.scope = store.Scope() } n.Unlock() nl = append(nl, n) } } return nl } func (n *network) getEndpointFromStore(eid string) (*endpoint, error) { var errors []string for _, store := range n.ctrlr.getStores() { ep := &endpoint{id: eid, network: n} err := store.GetObject(datastore.Key(ep.Key()...), ep) // Continue searching in the next store if the key is not found in this store if err != nil { if err != datastore.ErrKeyNotFound { errors = append(errors, fmt.Sprintf("{%s:%v}, ", store.Scope(), err)) logrus.Debugf("could not find endpoint %s in %s: %v", eid, store.Scope(), err) } continue } return ep, nil } return nil, fmt.Errorf("could not find endpoint %s: %v", eid, errors) } func (n *network) getEndpointsFromStore() ([]*endpoint, error) { var epl []*endpoint tmp := endpoint{network: n} for _, store := range n.getController().getStores() { kvol, err := store.List(datastore.Key(tmp.KeyPrefix()...), &endpoint{network: n}) // Continue searching in the next store if no keys found in this store if err != nil { if err != datastore.ErrKeyNotFound { logrus.Debugf("failed to get endpoints for network %s scope %s: %v", n.Name(), store.Scope(), err) } continue } for _, kvo := range kvol { ep := kvo.(*endpoint) epl = append(epl, ep) } } return epl, nil } func (c *controller) updateToStore(kvObject datastore.KVObject) error { cs := c.getStore(kvObject.DataScope()) if cs == nil { return ErrDataStoreNotInitialized(kvObject.DataScope()) } if err := cs.PutObjectAtomic(kvObject); err != nil { if err == datastore.ErrKeyModified { return err } return fmt.Errorf("failed to update store for object type %T: %v", kvObject, err) } return nil } func (c *controller) deleteFromStore(kvObject datastore.KVObject) error { cs := c.getStore(kvObject.DataScope()) if cs == nil { return ErrDataStoreNotInitialized(kvObject.DataScope()) } retry: if err := cs.DeleteObjectAtomic(kvObject); err != nil { if err == datastore.ErrKeyModified { if err := cs.GetObject(datastore.Key(kvObject.Key()...), kvObject); err != nil { return fmt.Errorf("could not update the kvobject to latest when trying to delete: %v", err) } logrus.Warnf("Error (%v) deleting object %v, retrying....", err, kvObject.Key()) goto retry } return err } return nil } type netWatch struct { localEps map[string]*endpoint remoteEps map[string]*endpoint stopCh chan struct{} } func (c *controller) getLocalEps(nw *netWatch) []*endpoint { c.Lock() defer c.Unlock() var epl []*endpoint for _, ep := range nw.localEps { epl = append(epl, ep) } return epl } func (c *controller) watchSvcRecord(ep *endpoint) { c.watchCh <- ep } func (c *controller) unWatchSvcRecord(ep *endpoint) { c.unWatchCh <- ep } func (c *controller) networkWatchLoop(nw *netWatch, ep *endpoint, ecCh <-chan datastore.KVObject) { for { select { case <-nw.stopCh: return case o := <-ecCh: ec := o.(*endpointCnt) epl, err := ec.n.getEndpointsFromStore() if err != nil { break } c.Lock() var addEp []*endpoint delEpMap := make(map[string]*endpoint) renameEpMap := make(map[string]bool) for k, v := range nw.remoteEps { delEpMap[k] = v } for _, lEp := range epl { if _, ok := nw.localEps[lEp.ID()]; ok { continue } if ep, ok := nw.remoteEps[lEp.ID()]; ok { // On a container rename EP ID will remain // the same but the name will change. service // records should reflect the change. // Keep old EP entry in the delEpMap and add // EP from the store (which has the new name) // into the new list if lEp.name == ep.name { delete(delEpMap, lEp.ID()) continue } renameEpMap[lEp.ID()] = true } nw.remoteEps[lEp.ID()] = lEp addEp = append(addEp, lEp) } // EPs whose name are to be deleted from the svc records // should also be removed from nw's remote EP list, except // the ones that are getting renamed. for _, lEp := range delEpMap { if !renameEpMap[lEp.ID()] { delete(nw.remoteEps, lEp.ID()) } } c.Unlock() for _, lEp := range delEpMap { ep.getNetwork().updateSvcRecord(lEp, c.getLocalEps(nw), false) } for _, lEp := range addEp { ep.getNetwork().updateSvcRecord(lEp, c.getLocalEps(nw), true) } } } } func (c *controller) processEndpointCreate(nmap map[string]*netWatch, ep *endpoint) { n := ep.getNetwork() if !c.isDistributedControl() && n.Scope() == datastore.SwarmScope && n.driverIsMultihost() { return } c.Lock() nw, ok := nmap[n.ID()] c.Unlock() if ok { // Update the svc db for the local endpoint join right away n.updateSvcRecord(ep, c.getLocalEps(nw), true) c.Lock() nw.localEps[ep.ID()] = ep // If we had learned that from the kv store remove it // from remote ep list now that we know that this is // indeed a local endpoint delete(nw.remoteEps, ep.ID()) c.Unlock() return } nw = &netWatch{ localEps: make(map[string]*endpoint), remoteEps: make(map[string]*endpoint), } // Update the svc db for the local endpoint join right away // Do this before adding this ep to localEps so that we don't // try to update this ep's container's svc records n.updateSvcRecord(ep, c.getLocalEps(nw), true) c.Lock() nw.localEps[ep.ID()] = ep nmap[n.ID()] = nw nw.stopCh = make(chan struct{}) c.Unlock() store := c.getStore(n.DataScope()) if store == nil { return } if !store.Watchable() { return } ch, err := store.Watch(n.getEpCnt(), nw.stopCh) if err != nil { logrus.Warnf("Error creating watch for network: %v", err) return } go c.networkWatchLoop(nw, ep, ch) } func (c *controller) processEndpointDelete(nmap map[string]*netWatch, ep *endpoint) { n := ep.getNetwork() if !c.isDistributedControl() && n.Scope() == datastore.SwarmScope && n.driverIsMultihost() { return } c.Lock() nw, ok := nmap[n.ID()] if ok { delete(nw.localEps, ep.ID()) c.Unlock() // Update the svc db about local endpoint leave right away // Do this after we remove this ep from localEps so that we // don't try to remove this svc record from this ep's container. n.updateSvcRecord(ep, c.getLocalEps(nw), false) c.Lock() if len(nw.localEps) == 0 { close(nw.stopCh) // This is the last container going away for the network. Destroy // this network's svc db entry delete(c.svcRecords, n.ID()) delete(nmap, n.ID()) } } c.Unlock() } func (c *controller) watchLoop() { for { select { case ep := <-c.watchCh: c.processEndpointCreate(c.nmap, ep) case ep := <-c.unWatchCh: c.processEndpointDelete(c.nmap, ep) } } } func (c *controller) startWatch() { if c.watchCh != nil { return } c.watchCh = make(chan *endpoint) c.unWatchCh = make(chan *endpoint) c.nmap = make(map[string]*netWatch) go c.watchLoop() } func (c *controller) networkCleanup() { for _, n := range c.getNetworksFromStore() { if n.inDelete { logrus.Infof("Removing stale network %s (%s)", n.Name(), n.ID()) if err := n.delete(true, true); err != nil { logrus.Debugf("Error while removing stale network: %v", err) } } } } var populateSpecial NetworkWalker = func(nw Network) bool { if n := nw.(*network); n.hasSpecialDriver() && !n.ConfigOnly() { if err := n.getController().addNetwork(n); err != nil { logrus.Warnf("Failed to populate network %q with driver %q", nw.Name(), nw.Type()) } } return false }