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package cluster
import (
"github.com/seaweedfs/seaweedfs/weed/pb"
"github.com/seaweedfs/seaweedfs/weed/pb/master_pb"
"sync"
"time"
)
const (
MasterType = "master"
VolumeServerType = "volumeServer"
FilerType = "filer"
BrokerType = "broker"
)
type FilerGroupName string
type DataCenter string
type Rack string
type Leaders struct {
leaders [3]pb.ServerAddress
}
type ClusterNode struct {
Address pb.ServerAddress
Version string
counter int
CreatedTs time.Time
DataCenter DataCenter
Rack Rack
}
type GroupMembers struct {
members map[pb.ServerAddress]*ClusterNode
}
type ClusterNodeGroups struct {
groupMembers map[FilerGroupName]*GroupMembers
sync.RWMutex
}
type Cluster struct {
filerGroups *ClusterNodeGroups
brokerGroups *ClusterNodeGroups
}
func newClusterNodeGroups() *ClusterNodeGroups {
return &ClusterNodeGroups{
groupMembers: map[FilerGroupName]*GroupMembers{},
}
}
func (g *ClusterNodeGroups) getGroupMembers(filerGroup FilerGroupName, createIfNotFound bool) *GroupMembers {
members, found := g.groupMembers[filerGroup]
if !found && createIfNotFound {
members = &GroupMembers{
members: make(map[pb.ServerAddress]*ClusterNode),
}
g.groupMembers[filerGroup] = members
}
return members
}
func (m *GroupMembers) addMember(dataCenter DataCenter, rack Rack, address pb.ServerAddress, version string) *ClusterNode {
if existingNode, found := m.members[address]; found {
existingNode.counter++
return nil
}
t := &ClusterNode{
Address: address,
Version: version,
counter: 1,
CreatedTs: time.Now(),
DataCenter: dataCenter,
Rack: rack,
}
m.members[address] = t
return t
}
func (m *GroupMembers) removeMember(address pb.ServerAddress) bool {
if existingNode, found := m.members[address]; !found {
return false
} else {
existingNode.counter--
if existingNode.counter <= 0 {
delete(m.members, address)
return true
}
}
return false
}
func (m *GroupMembers) GetMembers() (addresses []pb.ServerAddress) {
for k := range m.members {
addresses = append(addresses, k)
}
return
}
func (g *ClusterNodeGroups) AddClusterNode(filerGroup FilerGroupName, nodeType string, dataCenter DataCenter, rack Rack, address pb.ServerAddress, version string) []*master_pb.KeepConnectedResponse {
g.Lock()
defer g.Unlock()
m := g.getGroupMembers(filerGroup, true)
if t := m.addMember(dataCenter, rack, address, version); t != nil {
return buildClusterNodeUpdateMessage(true, filerGroup, nodeType, address)
}
return nil
}
func (g *ClusterNodeGroups) RemoveClusterNode(filerGroup FilerGroupName, nodeType string, address pb.ServerAddress) []*master_pb.KeepConnectedResponse {
g.Lock()
defer g.Unlock()
m := g.getGroupMembers(filerGroup, false)
if m == nil {
return nil
}
if m.removeMember(address) {
return buildClusterNodeUpdateMessage(false, filerGroup, nodeType, address)
}
return nil
}
func (g *ClusterNodeGroups) ListClusterNode(filerGroup FilerGroupName) (nodes []*ClusterNode) {
g.Lock()
defer g.Unlock()
m := g.getGroupMembers(filerGroup, false)
if m == nil {
return nil
}
for _, node := range m.members {
nodes = append(nodes, node)
}
return
}
func NewCluster() *Cluster {
return &Cluster{
filerGroups: newClusterNodeGroups(),
brokerGroups: newClusterNodeGroups(),
}
}
func (cluster *Cluster) getGroupMembers(filerGroup FilerGroupName, nodeType string, createIfNotFound bool) *GroupMembers {
switch nodeType {
case FilerType:
return cluster.filerGroups.getGroupMembers(filerGroup, createIfNotFound)
case BrokerType:
return cluster.brokerGroups.getGroupMembers(filerGroup, createIfNotFound)
}
return nil
}
func (cluster *Cluster) AddClusterNode(ns, nodeType string, dataCenter DataCenter, rack Rack, address pb.ServerAddress, version string) []*master_pb.KeepConnectedResponse {
filerGroup := FilerGroupName(ns)
switch nodeType {
case FilerType:
return cluster.filerGroups.AddClusterNode(filerGroup, nodeType, dataCenter, rack, address, version)
case BrokerType:
return cluster.brokerGroups.AddClusterNode(filerGroup, nodeType, dataCenter, rack, address, version)
case MasterType:
return buildClusterNodeUpdateMessage(true, filerGroup, nodeType, address)
}
return nil
}
func (cluster *Cluster) RemoveClusterNode(ns string, nodeType string, address pb.ServerAddress) []*master_pb.KeepConnectedResponse {
filerGroup := FilerGroupName(ns)
switch nodeType {
case FilerType:
return cluster.filerGroups.RemoveClusterNode(filerGroup, nodeType, address)
case BrokerType:
return cluster.brokerGroups.RemoveClusterNode(filerGroup, nodeType, address)
case MasterType:
return buildClusterNodeUpdateMessage(false, filerGroup, nodeType, address)
}
return nil
}
func (cluster *Cluster) ListClusterNode(filerGroup FilerGroupName, nodeType string) (nodes []*ClusterNode) {
switch nodeType {
case FilerType:
return cluster.filerGroups.ListClusterNode(filerGroup)
case BrokerType:
return cluster.brokerGroups.ListClusterNode(filerGroup)
case MasterType:
}
return
}
func buildClusterNodeUpdateMessage(isAdd bool, filerGroup FilerGroupName, nodeType string, address pb.ServerAddress) (result []*master_pb.KeepConnectedResponse) {
result = append(result, &master_pb.KeepConnectedResponse{
ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
FilerGroup: string(filerGroup),
NodeType: nodeType,
Address: string(address),
IsAdd: isAdd,
},
})
return
}
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