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package wdclient
import (
"context"
"math/rand"
"time"
"github.com/chrislusf/seaweedfs/weed/util"
"google.golang.org/grpc"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/pb"
"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
)
type MasterClient struct {
clientType string
clientHost string
grpcPort uint32
currentMaster string
masters []string
grpcDialOption grpc.DialOption
vidMap
}
func NewMasterClient(grpcDialOption grpc.DialOption, clientType string, clientHost string, clientGrpcPort uint32, clientDataCenter string, masters []string) *MasterClient {
return &MasterClient{
clientType: clientType,
clientHost: clientHost,
grpcPort: clientGrpcPort,
masters: masters,
grpcDialOption: grpcDialOption,
vidMap: newVidMap(clientDataCenter),
}
}
func (mc *MasterClient) GetMaster() string {
return mc.currentMaster
}
func (mc *MasterClient) WaitUntilConnected() {
for mc.currentMaster == "" {
time.Sleep(time.Duration(rand.Int31n(200)) * time.Millisecond)
}
}
func (mc *MasterClient) KeepConnectedToMaster() {
glog.V(1).Infof("%s masterClient bootstraps with masters %v", mc.clientType, mc.masters)
for {
mc.tryAllMasters()
time.Sleep(time.Second)
}
}
func (mc *MasterClient) FindLeaderFromOtherPeers(myMasterAddress string) (leader string) {
for _, master := range mc.masters {
if master == myMasterAddress {
continue
}
if grpcErr := pb.WithMasterClient(master, mc.grpcDialOption, 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
}
func (mc *MasterClient) tryAllMasters() {
nextHintedLeader := ""
for _, master := range mc.masters {
nextHintedLeader = mc.tryConnectToMaster(master)
for nextHintedLeader != "" {
nextHintedLeader = mc.tryConnectToMaster(nextHintedLeader)
}
mc.currentMaster = ""
mc.vidMap = newVidMap("")
}
}
func (mc *MasterClient) tryConnectToMaster(master string) (nextHintedLeader string) {
glog.V(1).Infof("%s masterClient Connecting to master %v", mc.clientType, master)
gprcErr := pb.WithMasterClient(master, mc.grpcDialOption, func(client master_pb.SeaweedClient) error {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
stream, err := client.KeepConnected(ctx)
if err != nil {
glog.V(1).Infof("%s masterClient failed to keep connected to %s: %v", mc.clientType, master, err)
return err
}
if err = stream.Send(&master_pb.KeepConnectedRequest{Name: mc.clientType, GrpcPort: mc.grpcPort}); err != nil {
glog.V(0).Infof("%s masterClient failed to send to %s: %v", mc.clientType, master, err)
return err
}
glog.V(1).Infof("%s masterClient Connected to %v", mc.clientType, master)
mc.currentMaster = master
for {
volumeLocation, err := stream.Recv()
if err != nil {
glog.V(0).Infof("%s masterClient failed to receive from %s: %v", mc.clientType, master, err)
return err
}
// maybe the leader is changed
if volumeLocation.Leader != "" {
glog.V(0).Infof("redirected to leader %v", volumeLocation.Leader)
nextHintedLeader = volumeLocation.Leader
return nil
}
// process new volume location
loc := Location{
Url: volumeLocation.Url,
PublicUrl: volumeLocation.PublicUrl,
DataCenter: volumeLocation.DataCenter,
}
for _, newVid := range volumeLocation.NewVids {
glog.V(1).Infof("%s: %s masterClient adds volume %d", mc.clientType, loc.Url, newVid)
mc.addLocation(newVid, loc)
}
for _, deletedVid := range volumeLocation.DeletedVids {
glog.V(1).Infof("%s: %s masterClient removes volume %d", mc.clientType, loc.Url, deletedVid)
mc.deleteLocation(deletedVid, loc)
}
}
})
if gprcErr != nil {
glog.V(1).Infof("%s masterClient failed to connect with master %v: %v", mc.clientType, master, gprcErr)
}
return
}
func (mc *MasterClient) WithClient(fn func(client master_pb.SeaweedClient) error) error {
return util.Retry("master grpc", func() error {
for mc.currentMaster == "" {
time.Sleep(3 * time.Second)
}
return pb.WithMasterClient(mc.currentMaster, mc.grpcDialOption, func(client master_pb.SeaweedClient) error {
return fn(client)
})
})
}
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