seaweedfs/weed/wdclient/masterclient.go

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package wdclient
import (
"context"
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"fmt"
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"math/rand"
"sync"
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"time"
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"github.com/seaweedfs/seaweedfs/weed/stats"
"github.com/seaweedfs/seaweedfs/weed/util"
"google.golang.org/grpc"
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/pb"
"github.com/seaweedfs/seaweedfs/weed/pb/master_pb"
)
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type MasterClient struct {
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FilerGroup string
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clientType string
clientHost pb.ServerAddress
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rack string
currentMaster pb.ServerAddress
masters map[string]pb.ServerAddress
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grpcDialOption grpc.DialOption
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vidMap
vidMapCacheSize int
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OnPeerUpdate func(update *master_pb.ClusterNodeUpdate, startFrom time.Time)
OnPeerUpdateLock sync.RWMutex
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}
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func NewMasterClient(grpcDialOption grpc.DialOption, filerGroup string, clientType string, clientHost pb.ServerAddress, clientDataCenter string, rack string, masters map[string]pb.ServerAddress) *MasterClient {
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return &MasterClient{
FilerGroup: filerGroup,
clientType: clientType,
clientHost: clientHost,
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rack: rack,
masters: masters,
grpcDialOption: grpcDialOption,
vidMap: newVidMap(clientDataCenter),
vidMapCacheSize: 5,
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}
}
func (mc *MasterClient) SetOnPeerUpdateFn(onPeerUpdate func(update *master_pb.ClusterNodeUpdate, startFrom time.Time)) {
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mc.OnPeerUpdateLock.Lock()
mc.OnPeerUpdate = onPeerUpdate
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mc.OnPeerUpdateLock.Unlock()
}
func (mc *MasterClient) GetLookupFileIdFunction() LookupFileIdFunctionType {
return mc.LookupFileIdWithFallback
}
func (mc *MasterClient) LookupFileIdWithFallback(fileId string) (fullUrls []string, err error) {
fullUrls, err = mc.vidMap.LookupFileId(fileId)
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if err == nil && len(fullUrls) > 0 {
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return
}
err = pb.WithMasterClient(false, mc.currentMaster, mc.grpcDialOption, false, func(client master_pb.SeaweedClient) error {
resp, err := client.LookupVolume(context.Background(), &master_pb.LookupVolumeRequest{
VolumeOrFileIds: []string{fileId},
})
if err != nil {
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return fmt.Errorf("LookupVolume failed: %v", err)
}
for vid, vidLocation := range resp.VolumeIdLocations {
for _, vidLoc := range vidLocation.Locations {
loc := Location{
Url: vidLoc.Url,
PublicUrl: vidLoc.PublicUrl,
GrpcPort: int(vidLoc.GrpcPort),
DataCenter: vidLoc.DataCenter,
}
mc.vidMap.addLocation(uint32(vid), loc)
httpUrl := "http://" + loc.Url + "/" + fileId
// Prefer same data center
if mc.DataCenter != "" && mc.DataCenter == loc.DataCenter {
fullUrls = append([]string{httpUrl}, fullUrls...)
} else {
fullUrls = append(fullUrls, httpUrl)
}
}
}
return nil
})
return
}
func (mc *MasterClient) GetMaster() pb.ServerAddress {
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mc.WaitUntilConnected()
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return mc.currentMaster
}
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func (mc *MasterClient) GetMasters() map[string]pb.ServerAddress {
mc.WaitUntilConnected()
return mc.masters
}
func (mc *MasterClient) WaitUntilConnected() {
for {
if mc.currentMaster != "" {
return
}
time.Sleep(time.Duration(rand.Int31n(200)) * time.Millisecond)
}
}
func (mc *MasterClient) KeepConnectedToMaster() {
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glog.V(1).Infof("%s.%s masterClient bootstraps with masters %v", mc.FilerGroup, mc.clientType, mc.masters)
for {
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mc.tryAllMasters()
time.Sleep(time.Second)
}
}
func (mc *MasterClient) FindLeaderFromOtherPeers(myMasterAddress pb.ServerAddress) (leader string) {
for _, master := range mc.masters {
if master == myMasterAddress {
continue
}
if grpcErr := pb.WithMasterClient(false, master, mc.grpcDialOption, false, func(client master_pb.SeaweedClient) error {
ctx, cancel := context.WithTimeout(context.Background(), 120*time.Millisecond)
defer cancel()
resp, err := client.GetMasterConfiguration(ctx, &master_pb.GetMasterConfigurationRequest{})
if err != nil {
return err
}
leader = resp.Leader
return nil
}); grpcErr != nil {
glog.V(0).Infof("connect to %s: %v", master, grpcErr)
}
if leader != "" {
glog.V(0).Infof("existing leader is %s", leader)
return
}
}
glog.V(0).Infof("No existing leader found!")
return
}
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func (mc *MasterClient) tryAllMasters() {
var nextHintedLeader pb.ServerAddress
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for _, master := range mc.masters {
nextHintedLeader = mc.tryConnectToMaster(master)
for nextHintedLeader != "" {
nextHintedLeader = mc.tryConnectToMaster(nextHintedLeader)
}
mc.currentMaster = ""
}
}
func (mc *MasterClient) tryConnectToMaster(master pb.ServerAddress) (nextHintedLeader pb.ServerAddress) {
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glog.V(1).Infof("%s.%s masterClient Connecting to master %v", mc.FilerGroup, mc.clientType, master)
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stats.MasterClientConnectCounter.WithLabelValues("total").Inc()
gprcErr := pb.WithMasterClient(true, master, mc.grpcDialOption, false, func(client master_pb.SeaweedClient) error {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
stream, err := client.KeepConnected(ctx)
if err != nil {
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glog.V(1).Infof("%s.%s masterClient failed to keep connected to %s: %v", mc.FilerGroup, mc.clientType, master, err)
stats.MasterClientConnectCounter.WithLabelValues(stats.FailedToKeepConnected).Inc()
return err
}
if err = stream.Send(&master_pb.KeepConnectedRequest{
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FilerGroup: mc.FilerGroup,
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DataCenter: mc.DataCenter,
Rack: mc.rack,
ClientType: mc.clientType,
ClientAddress: string(mc.clientHost),
Version: util.Version(),
}); err != nil {
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glog.V(0).Infof("%s.%s masterClient failed to send to %s: %v", mc.FilerGroup, mc.clientType, master, err)
stats.MasterClientConnectCounter.WithLabelValues(stats.FailedToSend).Inc()
return err
}
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glog.V(1).Infof("%s.%s masterClient Connected to %v", mc.FilerGroup, mc.clientType, master)
resp, err := stream.Recv()
if err != nil {
glog.V(0).Infof("%s.%s masterClient failed to receive from %s: %v", mc.FilerGroup, mc.clientType, master, err)
stats.MasterClientConnectCounter.WithLabelValues(stats.FailedToReceive).Inc()
return err
}
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// check if it is the leader to determine whether to reset the vidMap
if resp.VolumeLocation != nil {
if resp.VolumeLocation.Leader != "" && string(master) != resp.VolumeLocation.Leader {
glog.V(0).Infof("master %v redirected to leader %v", master, resp.VolumeLocation.Leader)
nextHintedLeader = pb.ServerAddress(resp.VolumeLocation.Leader)
stats.MasterClientConnectCounter.WithLabelValues(stats.RedirectedToLeader).Inc()
return nil
}
mc.resetVidMap()
mc.updateVidMap(resp)
} else {
mc.resetVidMap()
}
mc.currentMaster = master
for {
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resp, err := stream.Recv()
if err != nil {
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glog.V(0).Infof("%s.%s masterClient failed to receive from %s: %v", mc.FilerGroup, mc.clientType, master, err)
stats.MasterClientConnectCounter.WithLabelValues(stats.FailedToReceive).Inc()
return err
}
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if resp.VolumeLocation != nil {
// maybe the leader is changed
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if resp.VolumeLocation.Leader != "" && string(mc.currentMaster) != resp.VolumeLocation.Leader {
glog.V(0).Infof("currentMaster %v redirected to leader %v", mc.currentMaster, resp.VolumeLocation.Leader)
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nextHintedLeader = pb.ServerAddress(resp.VolumeLocation.Leader)
stats.MasterClientConnectCounter.WithLabelValues(stats.RedirectedToLeader).Inc()
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return nil
}
mc.updateVidMap(resp)
}
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if resp.ClusterNodeUpdate != nil {
update := resp.ClusterNodeUpdate
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mc.OnPeerUpdateLock.RLock()
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if mc.OnPeerUpdate != nil {
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if update.FilerGroup == mc.FilerGroup {
if update.IsAdd {
glog.V(0).Infof("+ %s.%s %s leader:%v\n", update.FilerGroup, update.NodeType, update.Address, update.IsLeader)
} else {
glog.V(0).Infof("- %s.%s %s leader:%v\n", update.FilerGroup, update.NodeType, update.Address, update.IsLeader)
}
stats.MasterClientConnectCounter.WithLabelValues(stats.OnPeerUpdate).Inc()
mc.OnPeerUpdate(update, time.Now())
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}
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}
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mc.OnPeerUpdateLock.RUnlock()
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}
}
})
if gprcErr != nil {
stats.MasterClientConnectCounter.WithLabelValues(stats.Failed).Inc()
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glog.V(1).Infof("%s.%s masterClient failed to connect with master %v: %v", mc.FilerGroup, mc.clientType, master, gprcErr)
}
return
}
func (mc *MasterClient) updateVidMap(resp *master_pb.KeepConnectedResponse) {
// process new volume location
glog.V(1).Infof("updateVidMap() resp.VolumeLocation.DataCenter %v", resp.VolumeLocation.DataCenter)
loc := Location{
Url: resp.VolumeLocation.Url,
PublicUrl: resp.VolumeLocation.PublicUrl,
DataCenter: resp.VolumeLocation.DataCenter,
GrpcPort: int(resp.VolumeLocation.GrpcPort),
}
for _, newVid := range resp.VolumeLocation.NewVids {
glog.V(1).Infof("%s.%s: %s masterClient adds volume %d", mc.FilerGroup, mc.clientType, loc.Url, newVid)
mc.addLocation(newVid, loc)
}
for _, deletedVid := range resp.VolumeLocation.DeletedVids {
glog.V(1).Infof("%s.%s: %s masterClient removes volume %d", mc.FilerGroup, mc.clientType, loc.Url, deletedVid)
mc.deleteLocation(deletedVid, loc)
}
for _, newEcVid := range resp.VolumeLocation.NewEcVids {
glog.V(1).Infof("%s.%s: %s masterClient adds ec volume %d", mc.FilerGroup, mc.clientType, loc.Url, newEcVid)
mc.addEcLocation(newEcVid, loc)
}
for _, deletedEcVid := range resp.VolumeLocation.DeletedEcVids {
glog.V(1).Infof("%s.%s: %s masterClient removes ec volume %d", mc.FilerGroup, mc.clientType, loc.Url, deletedEcVid)
mc.deleteEcLocation(deletedEcVid, loc)
}
}
func (mc *MasterClient) WithClient(streamingMode bool, fn func(client master_pb.SeaweedClient) error) error {
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return util.Retry("master grpc", func() error {
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for mc.currentMaster == "" {
time.Sleep(3 * time.Second)
}
return pb.WithMasterClient(streamingMode, mc.currentMaster, mc.grpcDialOption, false, func(client master_pb.SeaweedClient) error {
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return fn(client)
})
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})
}
func (mc *MasterClient) resetVidMap() {
tail := &vidMap{
vid2Locations: mc.vid2Locations,
ecVid2Locations: mc.ecVid2Locations,
DataCenter: mc.DataCenter,
cache: mc.cache,
}
mc.vidMap = newVidMap(mc.DataCenter)
mc.vidMap.cache = tail
for i := 0; i < mc.vidMapCacheSize && tail.cache != nil; i++ {
if i == mc.vidMapCacheSize-1 {
tail.cache = nil
} else {
tail = tail.cache
}
}
}