141 lines
3.7 KiB
Go
141 lines
3.7 KiB
Go
package server
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import (
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"encoding/binary"
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"encoding/json"
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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/etcd/third_party/github.com/goraft/raft"
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)
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func init() {
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raft.RegisterCommand(&JoinCommandV1{})
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raft.RegisterCommand(&JoinCommandV2{})
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}
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// JoinCommandV1 represents a request to join the cluster.
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// The command returns the join_index (Uvarint).
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type JoinCommandV1 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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// The name of the join command in the log
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func (c *JoinCommandV1) 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 *JoinCommandV1) 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.PeerCount() >= ps.ClusterConfig().ActiveSize {
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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.RegisterPeer(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 *JoinCommandV1) NodeName() string {
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return c.Name
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}
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// JoinCommandV2 represents a request to join the cluster.
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type JoinCommandV2 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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PeerURL string `json:"peerURL"`
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ClientURL string `json:"clientURL"`
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}
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// CommandName returns the name of the command in the Raft log.
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func (c *JoinCommandV2) CommandName() string {
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return "etcd:v2:join"
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}
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// Apply attempts to join a machine to the cluster.
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func (c *JoinCommandV2) Apply(context raft.Context) (interface{}, error) {
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ps, _ := context.Server().Context().(*PeerServer)
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var msg = joinMessageV2{
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Mode: PeerMode,
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CommitIndex: context.CommitIndex(),
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}
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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 json.Marshal(msg)
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}
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// Check peer number in the cluster.
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if ps.registry.PeerCount() >= ps.ClusterConfig().ActiveSize {
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log.Debug("Join as proxy ", c.Name)
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ps.registry.RegisterProxy(c.Name, c.PeerURL, c.ClientURL)
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msg.Mode = ProxyMode
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return json.Marshal(msg)
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}
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// Remove it as a proxy if it is one.
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if ps.registry.ProxyExists(c.Name) {
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ps.registry.UnregisterProxy(c.Name)
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}
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// Add to shared peer registry.
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ps.registry.RegisterPeer(c.Name, c.PeerURL, c.ClientURL)
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// Add peer in raft
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if err := context.Server().AddPeer(c.Name, ""); err != nil {
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b, _ := json.Marshal(msg)
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return b, err
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}
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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 json.Marshal(msg)
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}
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func (c *JoinCommandV2) NodeName() string {
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return c.Name
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}
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type joinMessageV2 struct {
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CommitIndex uint64 `json:"commitIndex"`
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Mode Mode `json:"mode"`
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}
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