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107 lines
2.5 KiB
107 lines
2.5 KiB
package wdclient
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import (
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"context"
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"fmt"
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"time"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
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"github.com/chrislusf/seaweedfs/weed/util"
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"math/rand"
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)
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type MasterClient struct {
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ctx context.Context
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name string
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currentMaster string
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masters []string
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vidMap
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}
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func NewMasterClient(ctx context.Context, clientName string, masters []string) *MasterClient {
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return &MasterClient{
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ctx: ctx,
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name: clientName,
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masters: masters,
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vidMap: newVidMap(),
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}
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}
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func (mc *MasterClient) GetMaster() string {
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return mc.currentMaster
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}
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func (mc *MasterClient) WaitUntilConnected() {
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for mc.currentMaster == "" {
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time.Sleep(time.Duration(rand.Int31n(200)) * time.Millisecond)
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}
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}
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func (mc *MasterClient) KeepConnectedToMaster() {
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glog.V(0).Infof("%s bootstraps with masters %v", mc.name, mc.masters)
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for {
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mc.tryAllMasters()
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time.Sleep(time.Second)
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}
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}
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func (mc *MasterClient) tryAllMasters() {
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for _, master := range mc.masters {
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glog.V(0).Infof("Connecting to %v", master)
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withMasterClient(master, func(client master_pb.SeaweedClient) error {
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stream, err := client.KeepConnected(context.Background())
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if err != nil {
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glog.V(0).Infof("failed to keep connected to %s: %v", master, err)
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return err
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}
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if err = stream.Send(&master_pb.ClientListenRequest{Name: mc.name}); err != nil {
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glog.V(0).Infof("failed to send to %s: %v", master, err)
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return err
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}
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for {
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if volumeLocation, err := stream.Recv(); err != nil {
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glog.V(0).Infof("failed to receive from %s: %v", master, err)
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return err
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} else {
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glog.V(0).Infof("volume location: %+v", volumeLocation)
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loc := Location{
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Url: volumeLocation.Url,
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PublicUrl: volumeLocation.PublicUrl,
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}
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for _, newVid := range volumeLocation.NewVids {
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mc.addLocation(newVid, loc)
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}
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for _, deletedVid := range volumeLocation.DeletedVids {
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mc.deleteLocation(deletedVid, loc)
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}
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if mc.currentMaster == "" {
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glog.V(0).Infof("Connected to %v", master)
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mc.currentMaster = master
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}
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}
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}
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})
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mc.currentMaster = ""
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}
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}
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func withMasterClient(master string, fn func(client master_pb.SeaweedClient) error) error {
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grpcConnection, err := util.GrpcDial(master)
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if err != nil {
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return fmt.Errorf("fail to dial %s: %v", master, err)
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}
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defer grpcConnection.Close()
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client := master_pb.NewSeaweedClient(grpcConnection)
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return fn(client)
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}
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