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master.go
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master.go
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package master
import (
"encoding/json"
"fmt"
"net/http"
"sort"
"sync"
"time"
"github.com/Focinfi/oncekv/config"
"github.com/Focinfi/oncekv/log"
"github.com/Focinfi/oncekv/meta"
"github.com/Focinfi/oncekv/utils/mock"
"github.com/Focinfi/oncekv/utils/urlutil"
)
const (
logPrefix = "db/master:"
)
var (
heartbeatPeriod = time.Second
raftNodesKey = config.Config.RaftNodesKey
httpGetter = mock.HTTPGetter(mock.HTTPGetterFunc(http.Get))
)
// Master is the master of a raft group
type Master struct {
meta meta.Meta
getter mock.HTTPGetter
}
// Peers returns the peers
func (m *Master) Peers() ([]string, error) {
return m.fetchPeers()
}
// Start starts manage peers
func (m *Master) Start() {
ticker := time.NewTicker(heartbeatPeriod)
for {
select {
case <-ticker.C:
m.heartbeat()
}
}
}
func (m *Master) heartbeat() {
peers, err := m.fetchPeers()
if err != nil {
log.DB.Error(err)
return
}
log.Biz.Infoln(peers)
toRemove := []string{}
var wg sync.WaitGroup
var mux sync.Mutex
for _, peer := range peers {
wg.Add(1)
go func(url string) {
defer wg.Done()
var shouldRemove bool
resp, err := httpGetter.Get(fmt.Sprintf("%s/ping", urlutil.MakeURL(url)))
if err != nil {
log.DB.Error(err)
shouldRemove = true
} else {
if resp.StatusCode != http.StatusOK {
log.DB.Errorf("%s peer[%s] response code: %d\n", logPrefix, url, resp.StatusCode)
shouldRemove = true
}
resp.Body.Close()
}
if shouldRemove {
log.DB.Error(err)
mux.Lock()
defer mux.Unlock()
toRemove = append(toRemove, url)
}
}(peer)
}
wg.Wait()
log.Biz.Infoln(logPrefix, "toRemove:", toRemove)
if len(toRemove) > 0 {
go m.removeNodes(toRemove)
}
}
func (m *Master) removeNodes(nodes []string) {
if len(nodes) == 0 {
return
}
toRemove := map[string]bool{}
for _, node := range nodes {
toRemove[node] = true
}
curNodes, err := m.fetchPeers()
if err != nil {
log.DB.Error(err)
return
}
newPeers := []string{}
var changed bool
for _, peer := range curNodes {
if _, ok := toRemove[peer]; !ok {
newPeers = append(newPeers, peer)
} else {
changed = true
}
}
if changed {
m.UpdatePeers(newPeers)
}
}
func (m *Master) fetchPeers() ([]string, error) {
peers := []string{}
val, err := m.meta.Get(raftNodesKey)
if err == config.ErrDataNotFound {
return peers, nil
}
if err != nil {
return peers, err
}
if err := json.Unmarshal([]byte(val), &peers); err != nil {
return peers, err
}
return peers, nil
}
// UpdatePeers updatePeers into store
func (m *Master) UpdatePeers(peers []string) error {
sort.StringSlice(peers).Sort()
b, err := json.Marshal(peers)
if err != nil {
return err
}
log.DB.Info("To Update perrs:", peers)
return m.meta.Put(raftNodesKey, string(b))
}
// RegisterPeer register peer
func (m *Master) RegisterPeer(raftAddr, httpAddr string) error {
return m.meta.Put(httpAddrKeyOfRaftAddr(raftAddr), httpAddr)
}
// PeerHTTPAddr get the httpAddr for the raft
func (m *Master) PeerHTTPAddr(raftAddr string) (string, error) {
return m.meta.Get(httpAddrKeyOfRaftAddr(raftAddr))
}
// Default for the default master
var Default *Master
func init() {
Default = &Master{
meta: meta.Default,
}
}