package topology import ( "errors" "math/rand" "github.com/chrislusf/raft" "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/pb/master_pb" "github.com/chrislusf/seaweedfs/weed/sequence" "github.com/chrislusf/seaweedfs/weed/storage" "github.com/chrislusf/seaweedfs/weed/storage/needle" "github.com/chrislusf/seaweedfs/weed/util" ) type Topology struct { NodeImpl collectionMap *util.ConcurrentReadMap pulse int64 volumeSizeLimit uint64 Sequence sequence.Sequencer chanFullVolumes chan storage.VolumeInfo Configuration *Configuration RaftServer raft.Server } func NewTopology(id string, seq sequence.Sequencer, volumeSizeLimit uint64, pulse int) *Topology { t := &Topology{} t.id = NodeId(id) t.nodeType = "Topology" t.NodeImpl.value = t t.children = make(map[NodeId]Node) t.collectionMap = util.NewConcurrentReadMap() t.pulse = int64(pulse) t.volumeSizeLimit = volumeSizeLimit t.Sequence = seq t.chanFullVolumes = make(chan storage.VolumeInfo) t.Configuration = &Configuration{} return t } func (t *Topology) IsLeader() bool { if t.RaftServer != nil { return t.RaftServer.State() == raft.Leader } return false } func (t *Topology) Leader() (string, error) { l := "" if t.RaftServer != nil { l = t.RaftServer.Leader() } else { return "", errors.New("Raft Server not ready yet!") } if l == "" { // We are a single node cluster, we are the leader return t.RaftServer.Name(), errors.New("Raft Server not initialized!") } return l, nil } func (t *Topology) Lookup(collection string, vid needle.VolumeId) []*DataNode { //maybe an issue if lots of collections? if collection == "" { for _, c := range t.collectionMap.Items() { if list := c.(*Collection).Lookup(vid); list != nil { return list } } } else { if c, ok := t.collectionMap.Find(collection); ok { return c.(*Collection).Lookup(vid) } } return nil } func (t *Topology) NextVolumeId() (needle.VolumeId, error) { vid := t.GetMaxVolumeId() next := vid.Next() if _, err := t.RaftServer.Do(NewMaxVolumeIdCommand(next)); err != nil { return 0, err } return next, nil } func (t *Topology) HasWritableVolume(option *VolumeGrowOption) bool { vl := t.GetVolumeLayout(option.Collection, option.ReplicaPlacement, option.Ttl) return vl.GetActiveVolumeCount(option) > 0 } func (t *Topology) PickForWrite(count uint64, option *VolumeGrowOption) (string, uint64, *DataNode, error) { vid, count, datanodes, err := t.GetVolumeLayout(option.Collection, option.ReplicaPlacement, option.Ttl).PickForWrite(count, option) if err != nil || datanodes.Length() == 0 { return "", 0, nil, errors.New("No writable volumes available!") } fileId, count := t.Sequence.NextFileId(count) return needle.NewFileId(*vid, fileId, rand.Uint32()).String(), count, datanodes.Head(), nil } func (t *Topology) GetVolumeLayout(collectionName string, rp *storage.ReplicaPlacement, ttl *needle.TTL) *VolumeLayout { return t.collectionMap.Get(collectionName, func() interface{} { return NewCollection(collectionName, t.volumeSizeLimit) }).(*Collection).GetOrCreateVolumeLayout(rp, ttl) } func (t *Topology) ListCollections() (ret []*Collection) { for _, c := range t.collectionMap.Items() { ret = append(ret, c.(*Collection)) } return ret } func (t *Topology) FindCollection(collectionName string) (*Collection, bool) { c, hasCollection := t.collectionMap.Find(collectionName) if !hasCollection { return nil, false } return c.(*Collection), hasCollection } func (t *Topology) DeleteCollection(collectionName string) { t.collectionMap.Delete(collectionName) } func (t *Topology) RegisterVolumeLayout(v storage.VolumeInfo, dn *DataNode) { t.GetVolumeLayout(v.Collection, v.ReplicaPlacement, v.Ttl).RegisterVolume(&v, dn) } func (t *Topology) UnRegisterVolumeLayout(v storage.VolumeInfo, dn *DataNode) { glog.Infof("removing volume info:%+v", v) volumeLayout := t.GetVolumeLayout(v.Collection, v.ReplicaPlacement, v.Ttl) volumeLayout.UnRegisterVolume(&v, dn) if volumeLayout.isEmpty() { t.DeleteCollection(v.Collection) } } func (t *Topology) GetOrCreateDataCenter(dcName string) *DataCenter { for _, c := range t.Children() { dc := c.(*DataCenter) if string(dc.Id()) == dcName { return dc } } dc := NewDataCenter(dcName) t.LinkChildNode(dc) return dc } func (t *Topology) SyncDataNodeRegistration(volumes []*master_pb.VolumeInformationMessage, dn *DataNode) (newVolumes, deletedVolumes []storage.VolumeInfo) { var volumeInfos []storage.VolumeInfo for _, v := range volumes { if vi, err := storage.NewVolumeInfo(v); err == nil { volumeInfos = append(volumeInfos, vi) } else { glog.V(0).Infof("Fail to convert joined volume information: %v", err) } } newVolumes, deletedVolumes = dn.UpdateVolumes(volumeInfos) for _, v := range volumeInfos { t.RegisterVolumeLayout(v, dn) } for _, v := range deletedVolumes { t.UnRegisterVolumeLayout(v, dn) } return }