func (self *Inspector) isFreeNode(seed *topo.Node) (bool, *topo.Node) {
resp, err := redis.ClusterNodesInRegion(seed.Addr(), self.LocalRegion)
if err != nil && strings.HasPrefix(err.Error(), "ERR Wrong CLUSTER subcommand or number of arguments") {
//server version do not support 'cluster nodes extra [region]'
resp, err = redis.ClusterNodes(seed.Addr())
}
if err != nil {
return false, nil
}
numNode := 0
lines := strings.Split(resp, "\n")
for _, line := range lines {
line = strings.TrimSpace(line)
if line == "" || strings.HasPrefix(line, "# ") {
continue
}
numNode++
}
if numNode != 1 {
return false, nil
}
for _, line := range lines {
line = strings.TrimSpace(line)
if line == "" || strings.HasPrefix(line, "# ") {
continue
}
node, myself, err := self.buildNode(line)
if node.Ip == "127.0.0.1" {
node.Ip = seed.Ip
}
// 只看到自己，是主，且没有slots，才认为是FreeNode
if !myself {
return false, nil
}
if err != nil || len(node.Ranges) > 0 || !node.IsMaster() {
return false, nil
} else {
return true, node
}
}
return false, nil
}
func (self *Inspector) checkClusterTopo(seed *topo.Node, cluster *topo.Cluster) error {
resp, err := redis.ClusterNodesInRegion(seed.Addr(), self.LocalRegion)
if err != nil && strings.HasPrefix(err.Error(), "ERR Wrong CLUSTER subcommand or number of arguments") {
//server version do not support 'cluster nodes extra [region]'
resp, err = redis.ClusterNodes(seed.Addr())
}
//this may lead to BuildClusterTopo update failed for a time
//the node is step into this state after check IsAlive
if err != nil && strings.HasPrefix(err.Error(), "LOADING") {
return nil
}
if err != nil {
return err
}
var summary topo.SummaryInfo
lines := strings.Split(resp, "\n")
for _, line := range lines {
if strings.HasPrefix(line, "# ") {
summary.ReadLine(line)
continue
}
line = strings.TrimSpace(line)
if line == "" {
continue
}
s, myself, err := self.buildNode(line)
if err == ErrNodeInHandShake || err == ErrNodeNoAddr {
continue
}
// Fix 'cluster nodes extra' & 'cluster nodes extra region' compatiable
if s.Region != self.LocalRegion {
continue
}
if err != nil {
return err
}
if s.Ip == "127.0.0.1" {
s.Ip = seed.Ip
}
node := cluster.FindNode(s.Id)
if node == nil {
if s.PFail {
glog.Warningf("forget dead node %s(%s) should be forgoten", s.Id, s.Addr())
//redis.ClusterForget(seed.Addr(), s.Id)
}
return fmt.Errorf("node not exist %s(%s)", s.Id, s.Addr())
}
// 对比节点数据是否相同
if !node.Compare(s) {
glog.Infof("%#v vs %#v different", s, node)
if s.Tag == "-" && node.Tag != "-" {
// 可能存在处于不被Cluster接受的节点，节点可以看见Cluster，但Cluster看不到它。
// 一种复现情况情况：某个节点已经死了，系统将其Forget，但是OP并未被摘除该节点，
// 而是恢复了该节点。
glog.Warningf("remeet node %s", seed.Addr())
self.MeetNode(seed)
}
return ErrNodesInfoNotSame
}
if len(node.Ranges) == 0 && len(s.Ranges) > 0 {
glog.Warningf("Ranges not equal, use nonempty ranges.")
node.Ranges = s.Ranges
}
if myself {
info, err := redis.FetchClusterInfo(node.Addr())
if err != nil {
return err
}
node.ClusterInfo = info
node.SummaryInfo = summary
}
if len(s.Migrating) != 0 {
node.Migrating = s.Migrating
}
if len(s.Importing) != 0 {
node.Importing = s.Importing
}
if s.PFail {
node.IncrPFailCount()
}
}
return nil
}
func (self *Inspector) initClusterTopo(seed *topo.Node) (*topo.Cluster, error) {
resp, err := redis.ClusterNodesInRegion(seed.Addr(), self.LocalRegion)
if err != nil && strings.HasPrefix(err.Error(), "ERR Wrong CLUSTER subcommand or number of arguments") {
//server version do not support 'cluster nodes extra [region]'
resp, err = redis.ClusterNodes(seed.Addr())
}
if err != nil {
return nil, err
}
cluster := topo.NewCluster(self.LocalRegion)
var summary topo.SummaryInfo
var nodeidx *topo.Node
var cnt int
lines := strings.Split(resp, "\n")
cnt = 0
for _, line := range lines {
if strings.HasPrefix(line, "# ") {
summary.ReadLine(line)
continue
}
line = strings.TrimSpace(line)
if line == "" {
continue
}
node, myself, err := self.buildNode(line)
if err == ErrNodeInHandShake || err == ErrNodeNoAddr {
continue
}
// Fix 'cluster nodes extra' & 'cluster nodes extra region' compatiable
if node.Region != self.LocalRegion {
continue
}
if err != nil {
return nil, err
}
if node.Ip == "127.0.0.1" {
node.Ip = seed.Ip
}
// 遇到myself，读取该节点的ClusterInfo
if myself {
info, err := redis.FetchClusterInfo(node.Addr())
if err != nil {
return nil, err
}
node.ClusterInfo = info
node.SummaryInfo = summary
}
cluster.AddNode(node)
nodeidx = node
cnt++
}
if cnt == 1 {
if nodeidx.IsMaster() && len(nodeidx.Ranges) == 0 {
glog.Infof("Node %s is free node", nodeidx.Addr())
nodeidx.SetFree(true)
}
}
return cluster, nil
}