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package topology
import (
"code.google.com/p/weed-fs/go/sequence"
"code.google.com/p/weed-fs/go/storage"
"errors"
"io/ioutil"
"code.google.com/p/weed-fs/go/glog"
"math/rand"
)
type Topology struct {
NodeImpl
//transient vid~servers mapping for each replication type
replicaType2VolumeLayout []*VolumeLayout
pulse int64
volumeSizeLimit uint64
sequence sequence.Sequencer
chanDeadDataNodes chan *DataNode
chanRecoveredDataNodes chan *DataNode
chanFullVolumes chan storage.VolumeInfo
configuration *Configuration
}
func NewTopology(id string, confFile string, dirname string, sequenceFilename string, 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.replicaType2VolumeLayout = make([]*VolumeLayout, storage.LengthRelicationType)
t.pulse = int64(pulse)
t.volumeSizeLimit = volumeSizeLimit
t.sequence = sequence.NewSequencer(dirname, sequenceFilename)
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) loadConfiguration(configurationFile string) error {
b, e := ioutil.ReadFile(configurationFile)
if e == nil {
t.configuration, e = NewConfiguration(b)
return e
} else {
glog.V(0).Infoln("Using default configurations.")
}
return nil
}
func (t *Topology) Lookup(vid storage.VolumeId) []*DataNode {
for _, vl := range t.replicaType2VolumeLayout {
if vl != nil {
if list := vl.Lookup(vid); list != nil {
return list
}
}
}
return nil
}
func (t *Topology) RandomlyReserveOneVolume(dataCenter string) (bool, *DataNode, *storage.VolumeId) {
if t.FreeSpace() <= 0 {
glog.V(0).Infoln("Topology does not have free space left!")
return false, nil, nil
}
vid := t.NextVolumeId()
ret, node := t.ReserveOneVolume(rand.Intn(t.FreeSpace()), vid, dataCenter)
return ret, node, &vid
}
func (t *Topology) NextVolumeId() storage.VolumeId {
vid := t.GetMaxVolumeId()
return vid.Next()
}
func (t *Topology) PickForWrite(repType storage.ReplicationType, count int, dataCenter string) (string, int, *DataNode, error) {
replicationTypeIndex := repType.GetReplicationLevelIndex()
if t.replicaType2VolumeLayout[replicationTypeIndex] == nil {
t.replicaType2VolumeLayout[replicationTypeIndex] = NewVolumeLayout(repType, t.volumeSizeLimit, t.pulse)
}
vid, count, datanodes, err := t.replicaType2VolumeLayout[replicationTypeIndex].PickForWrite(count, dataCenter)
if err != nil || datanodes.Length() == 0 {
return "", 0, nil, errors.New("No writable volumes avalable!")
}
fileId, count := t.sequence.NextFileId(count)
return storage.NewFileId(*vid, fileId, rand.Uint32()).String(), count, datanodes.Head(), nil
}
func (t *Topology) GetVolumeLayout(repType storage.ReplicationType) *VolumeLayout {
replicationTypeIndex := repType.GetReplicationLevelIndex()
if t.replicaType2VolumeLayout[replicationTypeIndex] == nil {
glog.V(0).Infoln("adding replication type", repType)
t.replicaType2VolumeLayout[replicationTypeIndex] = NewVolumeLayout(repType, t.volumeSizeLimit, t.pulse)
}
return t.replicaType2VolumeLayout[replicationTypeIndex]
}
func (t *Topology) RegisterVolumeLayout(v *storage.VolumeInfo, dn *DataNode) {
t.GetVolumeLayout(v.RepType).RegisterVolume(v, dn)
}
func (t *Topology) RegisterVolumes(init bool, volumeInfos []storage.VolumeInfo, ip string, port int, publicUrl string, maxVolumeCount int, dcName string, rackName string) {
dcName, rackName = t.configuration.Locate(ip, dcName, rackName)
dc := t.GetOrCreateDataCenter(dcName)
rack := dc.GetOrCreateRack(rackName)
dn := rack.FindDataNode(ip, port)
if init && dn != nil {
t.UnRegisterDataNode(dn)
}
dn = rack.GetOrCreateDataNode(ip, port, publicUrl, maxVolumeCount)
for _, v := range volumeInfos {
dn.AddOrUpdateVolume(v)
t.RegisterVolumeLayout(&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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