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