seaweedfs/weed/wdclient/masterclient.go

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package wdclient
import (
"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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type MasterClient struct {
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ctx context.Context
name string
currentMaster string
masters []string
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,
name: clientName,
masters: masters,
grpcDialOption: grpcDialOption,
vidMap: newVidMap(),
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}
}
func (mc *MasterClient) GetMaster() string {
return mc.currentMaster
}
func (mc *MasterClient) WaitUntilConnected() {
for mc.currentMaster == "" {
time.Sleep(time.Duration(rand.Int31n(200)) * time.Millisecond)
}
}
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func (mc *MasterClient) KeepConnectedToMaster() {
glog.V(1).Infof("%s bootstraps with masters %v", mc.name, mc.masters)
for {
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mc.tryAllMasters()
time.Sleep(time.Second)
}
}
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func (mc *MasterClient) tryAllMasters() {
for _, master := range mc.masters {
glog.V(1).Infof("Connecting to master %v", 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)
if err != nil {
glog.V(0).Infof("failed to keep connected to %s: %v", master, err)
return err
}
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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
}
if mc.currentMaster == "" {
glog.V(1).Infof("Connected to %v", master)
mc.currentMaster = master
}
for {
if volumeLocation, err := stream.Recv(); err != nil {
glog.V(0).Infof("failed to receive from %s: %v", master, err)
return err
} else {
loc := Location{
Url: volumeLocation.Url,
PublicUrl: volumeLocation.PublicUrl,
}
for _, newVid := range volumeLocation.NewVids {
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mc.addLocation(newVid, loc)
}
for _, deletedVid := range volumeLocation.DeletedVids {
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mc.deleteLocation(deletedVid, loc)
}
}
}
})
if gprcErr != nil {
glog.V(0).Infof("%s failed to connect with master %v: %v", mc.name, master, gprcErr)
}
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mc.currentMaster = ""
}
}
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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 {
masterGrpcAddress, parseErr := util.ParseServerToGrpcAddress(master)
if parseErr != nil {
return fmt.Errorf("failed to parse master grpc %v", master)
}
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grpcConnection, err := util.GrpcDial(ctx, masterGrpcAddress, grpcDialOption)
if err != nil {
return fmt.Errorf("fail to dial %s: %v", master, err)
}
defer grpcConnection.Close()
client := master_pb.NewSeaweedClient(grpcConnection)
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return fn(ctx, client)
}
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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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})
}