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package wdclient
import (
"context"
"time"
"fmt"
"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
"github.com/chrislusf/seaweedfs/weed/util"
"github.com/chrislusf/seaweedfs/weed/glog"
)
type MasterClient struct {
ctx context.Context
name string
currentMaster string
masters []string
}
func NewMasterClient(ctx context.Context, clientName string, masters []string) *MasterClient {
return &MasterClient{
ctx: ctx,
name: clientName,
masters: masters,
}
}
func (mc *MasterClient) GetMaster() string {
return mc.currentMaster
}
func (mc *MasterClient) KeepConnectedToMaster() {
glog.V(0).Infof("%s bootstraps with masters %v", mc.name, mc.masters)
for {
mc.tryAllMasters()
time.Sleep(time.Second)
}
}
func (mc *MasterClient) tryAllMasters() {
for _, master := range mc.masters {
glog.V(0).Infof("Connecting to %v", master)
withMasterClient(master, func(client master_pb.SeaweedClient) error {
stream, err := client.KeepConnected(context.Background())
if err != nil {
glog.V(0).Infof("failed to keep connected to %s: %v", master, err)
return err
}
glog.V(0).Infof("Connected to %v", master)
mc.currentMaster = master
if err = stream.Send(&master_pb.ClientListenRequest{Name: mc.name}); err != nil {
glog.V(0).Infof("failed to send to %s: %v", master, err)
return err
}
for {
if volumeLocation, err := stream.Recv(); err != nil {
glog.V(0).Infof("failed to receive from %s: %v", master, err)
return err
} else {
glog.V(0).Infof("volume location: %+v", volumeLocation)
}
}
})
mc.currentMaster = ""
}
}
func withMasterClient(master string, fn func(client master_pb.SeaweedClient) error) error {
grpcConnection, err := util.GrpcDial(master)
if err != nil {
return fmt.Errorf("fail to dial %s: %v", master, err)
}
defer grpcConnection.Close()
client := master_pb.NewSeaweedClient(grpcConnection)
return fn(client)
}
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