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127 lines
3.4 KiB
127 lines
3.4 KiB
package wdclient
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import (
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"context"
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"math/rand"
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"time"
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"google.golang.org/grpc"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/pb"
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"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
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)
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type MasterClient struct {
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clientType string
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clientHost string
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grpcPort uint32
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currentMaster string
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masters []string
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grpcDialOption grpc.DialOption
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vidMap
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}
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func NewMasterClient(grpcDialOption grpc.DialOption, clientType string, clientHost string, clientGrpcPort uint32, masters []string) *MasterClient {
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return &MasterClient{
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clientType: clientType,
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clientHost: clientHost,
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grpcPort: clientGrpcPort,
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masters: masters,
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grpcDialOption: grpcDialOption,
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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(1).Infof("%s bootstraps with masters %v", mc.clientType, 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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nextHintedLeader := ""
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for _, master := range mc.masters {
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nextHintedLeader = mc.tryConnectToMaster(master)
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for nextHintedLeader != "" {
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nextHintedLeader = mc.tryConnectToMaster(nextHintedLeader)
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}
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mc.currentMaster = ""
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mc.vidMap = newVidMap()
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}
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}
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func (mc *MasterClient) tryConnectToMaster(master string) (nextHintedLeader string) {
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glog.V(1).Infof("%s Connecting to master %v", mc.clientType, master)
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gprcErr := pb.WithMasterClient(master, mc.grpcDialOption, 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("%s failed to keep connected to %s: %v", mc.clientType, master, err)
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return err
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}
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if err = stream.Send(&master_pb.KeepConnectedRequest{Name: mc.clientType, GrpcPort: mc.grpcPort}); err != nil {
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glog.V(0).Infof("%s failed to send to %s: %v", mc.clientType, master, err)
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return err
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}
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glog.V(1).Infof("%s Connected to %v", mc.clientType, master)
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mc.currentMaster = master
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for {
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volumeLocation, err := stream.Recv()
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if err != nil {
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glog.V(0).Infof("%s failed to receive from %s: %v", mc.clientType, master, err)
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return err
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}
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// maybe the leader is changed
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if volumeLocation.Leader != "" {
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glog.V(0).Infof("redirected to leader %v", volumeLocation.Leader)
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nextHintedLeader = volumeLocation.Leader
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return nil
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}
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// process new volume location
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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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glog.V(1).Infof("%s: %s adds volume %d", mc.clientType, loc.Url, newVid)
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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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glog.V(1).Infof("%s: %s removes volume %d", mc.clientType, loc.Url, deletedVid)
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mc.deleteLocation(deletedVid, loc)
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}
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}
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})
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if gprcErr != nil {
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glog.V(0).Infof("%s failed to connect with master %v: %v", mc.clientType, master, gprcErr)
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}
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return
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}
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func (mc *MasterClient) WithClient(fn func(client master_pb.SeaweedClient) error) error {
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return pb.WithMasterClient(mc.currentMaster, mc.grpcDialOption, func(client master_pb.SeaweedClient) error {
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return fn(client)
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})
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}
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