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package topology
import (
"code.google.com/p/weed-fs/go/glog"
"code.google.com/p/weed-fs/go/sequence"
"code.google.com/p/weed-fs/go/storage"
"errors"
"github.com/goraft/raft"
"io/ioutil"
"math/rand"
)
type Topology struct {
NodeImpl
collectionMap map[string]*Collection
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 = make(map[string]*Collection)
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 {
return t.RaftServer == nil || t.Leader() == t.RaftServer.Name()
}
func (t *Topology) Leader() string {
l := ""
if t.RaftServer != nil {
l = t.RaftServer.Leader()
}
if l == "" {
// We are a single node cluster, we are the leader
return t.RaftServer.Name()
}
return l
}
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(collection string, vid storage.VolumeId) []*DataNode {
//maybe an issue if lots of collections?
if collection == "" {
for _, c := range t.collectionMap {
if list := c.Lookup(vid); list != nil {
return list
}
}
} else {
if c, ok := t.collectionMap[collection]; ok {
return c.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) PickForWrite(collectionName string, rp *storage.ReplicaPlacement, count int, dataCenter string) (string, int, *DataNode, error) {
vid, count, datanodes, err := t.GetVolumeLayout(collectionName, rp).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(collectionName string, rp *storage.ReplicaPlacement) *VolumeLayout {
_, ok := t.collectionMap[collectionName]
if !ok {
t.collectionMap[collectionName] = NewCollection(collectionName, t.volumeSizeLimit)
}
return t.collectionMap[collectionName].GetOrCreateVolumeLayout(rp)
}
func (t *Topology) GetCollection(collectionName string) (collection *Collection, ok bool) {
collection, ok = t.collectionMap[collectionName]
return
}
func (t *Topology) DeleteCollection(collectionName string) {
delete(t.collectionMap, collectionName)
}
func (t *Topology) RegisterVolumeLayout(v *storage.VolumeInfo, dn *DataNode) {
t.GetVolumeLayout(v.Collection, v.ReplicaPlacement).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)
dn.UpdateVolumes(volumeInfos)
for _, v := range volumeInfos {
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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