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package topology
import (
"errors"
"io/ioutil"
"math/rand"
"github.com/chrislusf/raft"
"github.com/chrislusf/seaweedfs/go/glog"
"github.com/chrislusf/seaweedfs/go/operation"
"github.com/chrislusf/seaweedfs/go/sequence"
"github.com/chrislusf/seaweedfs/go/storage"
"github.com/chrislusf/seaweedfs/go/util"
)
type Topology struct {
NodeImpl
collectionMap *util.ConcurrentReadMap
pulse int64
volumeSizeLimit uint64
Sequence sequence.Sequencer
chanDeadDataNodes chan *DataNode
chanRecoveredDataNodes chan *DataNode
chanFullVolumes chan storage.VolumeInfo
configuration *Configuration
RaftServer raft.Server
}
func NewTopology(id string, confFile string, seq sequence.Sequencer, volumeSizeLimit uint64, pulse int) (*Topology, error) {
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.chanDeadDataNodes = make(chan *DataNode)
t.chanRecoveredDataNodes = make(chan *DataNode)
t.chanFullVolumes = make(chan storage.VolumeInfo)
err := t.loadConfiguration(confFile)
return t, err
}
func (t *Topology) IsLeader() bool {
if leader, e := t.Leader(); e == nil {
return leader == t.RaftServer.Name()
}
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) loadConfiguration(configurationFile string) error {
b, e := ioutil.ReadFile(configurationFile)
if e == nil {
t.configuration, e = NewConfiguration(b)
return e
}
glog.V(0).Infoln("Using default configurations.")
return nil
}
func (t *Topology) Lookup(collection string, vid storage.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() storage.VolumeId {
vid := t.GetMaxVolumeId()
next := vid.Next()
go t.RaftServer.Do(NewMaxVolumeIdCommand(next))
return next
}
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 storage.NewFileId(*vid, fileId, rand.Uint32()).String(), count, datanodes.Head(), nil
}
func (t *Topology) GetVolumeLayout(collectionName string, rp *storage.ReplicaPlacement, ttl *storage.TTL) *VolumeLayout {
return t.collectionMap.Get(collectionName, func() interface{} {
return NewCollection(collectionName, t.volumeSizeLimit)
}).(*Collection).GetOrCreateVolumeLayout(rp, ttl)
}
func (t *Topology) FindCollection(collectionName string) (*Collection, bool) {
c, hasCollection := t.collectionMap.Find(collectionName)
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)
t.GetVolumeLayout(v.Collection, v.ReplicaPlacement, v.Ttl).UnRegisterVolume(&v, dn)
}
func (t *Topology) ProcessJoinMessage(joinMessage *operation.JoinMessage) {
t.Sequence.SetMax(*joinMessage.MaxFileKey)
dcName, rackName := t.configuration.Locate(*joinMessage.Ip, *joinMessage.DataCenter, *joinMessage.Rack)
dc := t.GetOrCreateDataCenter(dcName)
rack := dc.GetOrCreateRack(rackName)
dn := rack.FindDataNode(*joinMessage.Ip, int(*joinMessage.Port))
if *joinMessage.IsInit && dn != nil {
t.UnRegisterDataNode(dn)
}
dn = rack.GetOrCreateDataNode(*joinMessage.Ip,
int(*joinMessage.Port), *joinMessage.PublicUrl,
int(*joinMessage.MaxVolumeCount))
var volumeInfos []storage.VolumeInfo
for _, v := range joinMessage.Volumes {
if vi, err := storage.NewVolumeInfo(v); err == nil {
volumeInfos = append(volumeInfos, vi)
} else {
glog.V(0).Infoln("Fail to convert joined volume information:", err.Error())
}
}
deletedVolumes := dn.UpdateVolumes(volumeInfos)
for _, v := range volumeInfos {
t.RegisterVolumeLayout(v, dn)
}
for _, v := range deletedVolumes {
t.UnRegisterVolumeLayout(v, dn)
}
}
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
}
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