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122 lines
3.4 KiB
122 lines
3.4 KiB
package wdclient
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import (
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"context"
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"fmt"
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"math/rand"
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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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"google.golang.org/grpc"
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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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grpcDialOption grpc.DialOption
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vidMap
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}
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func NewMasterClient(ctx context.Context, grpcDialOption grpc.DialOption, 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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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.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(1).Infof("%s Connecting to master %v", mc.name, master)
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gprcErr := withMasterClient(context.Background(), master, mc.grpcDialOption, func(ctx context.Context, client master_pb.SeaweedClient) error {
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stream, err := client.KeepConnected(ctx)
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if err != nil {
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glog.V(0).Infof("%s failed to keep connected to %s: %v", mc.name, 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("%s failed to send to %s: %v", mc.name, master, err)
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return err
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}
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if mc.currentMaster == "" {
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glog.V(1).Infof("%s Connected to %v", mc.name, master)
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mc.currentMaster = master
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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("%s failed to receive from %s: %v", mc.name, master, err)
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return err
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} else {
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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.name, 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.name, 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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})
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if gprcErr != nil {
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glog.V(0).Infof("%s failed to connect with master %v: %v", mc.name, master, gprcErr)
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}
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mc.currentMaster = ""
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}
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}
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func withMasterClient(ctx context.Context, master string, grpcDialOption grpc.DialOption, fn func(ctx context.Context, client master_pb.SeaweedClient) error) error {
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masterGrpcAddress, parseErr := util.ParseServerToGrpcAddress(master)
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if parseErr != nil {
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return fmt.Errorf("failed to parse master grpc %v: %v", master, parseErr)
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}
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return util.WithCachedGrpcClient(ctx, func(grpcConnection *grpc.ClientConn) error {
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client := master_pb.NewSeaweedClient(grpcConnection)
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return fn(ctx, client)
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}, masterGrpcAddress, grpcDialOption)
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}
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func (mc *MasterClient) WithClient(ctx context.Context, fn func(client master_pb.SeaweedClient) error) error {
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return withMasterClient(ctx, mc.currentMaster, mc.grpcDialOption, func(ctx context.Context, client master_pb.SeaweedClient) error {
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return fn(client)
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})
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}
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