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package cluster
import (
"github.com/chrislusf/seaweedfs/weed/pb"
"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
"math"
"sync"
"time"
)
const (
MasterType = "master"
FilerType = "filer"
BrokerType = "broker"
)
type ClusterNode struct {
Address pb.ServerAddress
Version string
counter int
createdTs time.Time
}
type Leaders struct {
leaders [3]pb.ServerAddress
}
type Cluster struct {
filers map[pb.ServerAddress]*ClusterNode
filersLock sync.RWMutex
filerLeaders *Leaders
}
func NewCluster() *Cluster {
return &Cluster{
filers: make(map[pb.ServerAddress]*ClusterNode),
filerLeaders: &Leaders{},
}
}
func (cluster *Cluster) AddClusterNode(nodeType string, address pb.ServerAddress, version string) []*master_pb.KeepConnectedResponse {
switch nodeType {
case FilerType:
cluster.filersLock.Lock()
defer cluster.filersLock.Unlock()
if existingNode, found := cluster.filers[address]; found {
existingNode.counter++
return nil
}
cluster.filers[address] = &ClusterNode{
Address: address,
Version: version,
counter: 1,
createdTs: time.Now(),
}
return cluster.ensureFilerLeaders(true, nodeType, address)
case MasterType:
}
return nil
}
func (cluster *Cluster) RemoveClusterNode(nodeType string, address pb.ServerAddress) []*master_pb.KeepConnectedResponse {
switch nodeType {
case FilerType:
cluster.filersLock.Lock()
defer cluster.filersLock.Unlock()
if existingNode, found := cluster.filers[address]; !found {
return nil
} else {
existingNode.counter--
if existingNode.counter <= 0 {
delete(cluster.filers, address)
return cluster.ensureFilerLeaders(false, nodeType, address)
}
}
case MasterType:
}
return nil
}
func (cluster *Cluster) ListClusterNode(nodeType string) (nodes []*ClusterNode) {
switch nodeType {
case FilerType:
cluster.filersLock.RLock()
defer cluster.filersLock.RUnlock()
for _, node := range cluster.filers {
nodes = append(nodes, node)
}
case MasterType:
}
return
}
func (cluster *Cluster) IsOneLeader(address pb.ServerAddress) bool {
return cluster.filerLeaders.isOneLeader(address)
}
func (cluster *Cluster) ensureFilerLeaders(isAdd bool, nodeType string, address pb.ServerAddress) (result []*master_pb.KeepConnectedResponse) {
if isAdd {
if cluster.filerLeaders.addLeaderIfVacant(address) {
// has added the address as one leader
result = append(result, &master_pb.KeepConnectedResponse{
ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
NodeType: nodeType,
Address: string(address),
IsLeader: true,
IsAdd: true,
},
})
} else {
result = append(result, &master_pb.KeepConnectedResponse{
ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
NodeType: nodeType,
Address: string(address),
IsLeader: false,
IsAdd: true,
},
})
}
} else {
if cluster.filerLeaders.removeLeaderIfExists(address) {
result = append(result, &master_pb.KeepConnectedResponse{
ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
NodeType: nodeType,
Address: string(address),
IsLeader: true,
IsAdd: false,
},
})
// pick the freshest one, since it is less likely to go away
var shortestDuration int64 = math.MaxInt64
now := time.Now()
var candidateAddress pb.ServerAddress
for _, node := range cluster.filers {
if cluster.filerLeaders.isOneLeader(node.Address) {
continue
}
duration := now.Sub(node.createdTs).Nanoseconds()
if duration < shortestDuration {
shortestDuration = duration
candidateAddress = node.Address
}
}
if candidateAddress != "" {
cluster.filerLeaders.addLeaderIfVacant(candidateAddress)
// added a new leader
result = append(result, &master_pb.KeepConnectedResponse{
ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
NodeType: nodeType,
Address: string(candidateAddress),
IsLeader: true,
IsAdd: true,
},
})
}
} else {
result = append(result, &master_pb.KeepConnectedResponse{
ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
NodeType: nodeType,
Address: string(address),
IsLeader: false,
IsAdd: false,
},
})
}
}
return
}
func (leaders *Leaders) addLeaderIfVacant(address pb.ServerAddress) (hasChanged bool) {
if leaders.isOneLeader(address) {
return
}
for i := 0; i < len(leaders.leaders); i++ {
if leaders.leaders[i] == "" {
leaders.leaders[i] = address
hasChanged = true
return
}
}
return
}
func (leaders *Leaders) removeLeaderIfExists(address pb.ServerAddress) (hasChanged bool) {
if !leaders.isOneLeader(address) {
return
}
for i := 0; i < len(leaders.leaders); i++ {
if leaders.leaders[i] == address {
leaders.leaders[i] = ""
hasChanged = true
return
}
}
return
}
func (leaders *Leaders) isOneLeader(address pb.ServerAddress) bool {
for i := 0; i < len(leaders.leaders); i++ {
if leaders.leaders[i] == address {
return true
}
}
return false
}
func (leaders *Leaders) GetLeaders() (addresses []pb.ServerAddress) {
for i := 0; i < len(leaders.leaders); i++ {
if leaders.leaders[i] != "" {
addresses = append(addresses, leaders.leaders[i])
}
}
return
}
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