78 lines
1.9 KiB
Go
78 lines
1.9 KiB
Go
package server
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import (
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"encoding/binary"
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etcdErr "github.com/coreos/etcd/error"
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"github.com/coreos/etcd/log"
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"github.com/coreos/raft"
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)
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func init() {
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raft.RegisterCommand(&JoinCommand{})
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}
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// The JoinCommand adds a node to the cluster.
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type JoinCommand struct {
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MinVersion int `json:"minVersion"`
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MaxVersion int `json:"maxVersion"`
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Name string `json:"name"`
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RaftURL string `json:"raftURL"`
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EtcdURL string `json:"etcdURL"`
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}
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func NewJoinCommand(minVersion int, maxVersion int, name, raftUrl, etcdUrl string) *JoinCommand {
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return &JoinCommand{
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MinVersion: minVersion,
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MaxVersion: maxVersion,
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Name: name,
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RaftURL: raftUrl,
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EtcdURL: etcdUrl,
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}
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}
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// The name of the join command in the log
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func (c *JoinCommand) CommandName() string {
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return "etcd:join"
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}
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// Join a server to the cluster
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func (c *JoinCommand) Apply(context raft.Context) (interface{}, error) {
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ps, _ := context.Server().Context().(*PeerServer)
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b := make([]byte, 8)
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binary.PutUvarint(b, context.CommitIndex())
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// Make sure we're not getting a cached value from the registry.
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ps.registry.Invalidate(c.Name)
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// Check if the join command is from a previous peer, who lost all its previous log.
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if _, ok := ps.registry.ClientURL(c.Name); ok {
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return b, nil
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}
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// Check peer number in the cluster
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if ps.registry.Count() == ps.MaxClusterSize {
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log.Debug("Reject join request from ", c.Name)
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return []byte{0}, etcdErr.NewError(etcdErr.EcodeNoMorePeer, "", context.CommitIndex())
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}
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// Add to shared peer registry.
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ps.registry.Register(c.Name, c.RaftURL, c.EtcdURL)
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// Add peer in raft
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err := context.Server().AddPeer(c.Name, "")
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// Add peer stats
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if c.Name != ps.RaftServer().Name() {
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ps.followersStats.Followers[c.Name] = &raftFollowerStats{}
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ps.followersStats.Followers[c.Name].Latency.Minimum = 1 << 63
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}
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return b, err
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}
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func (c *JoinCommand) NodeName() string {
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return c.Name
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}
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