seaweedfs/weed/wdclient/masterclient.go

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package wdclient
import (
"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"
"math/rand"
)
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type MasterClient struct {
ctx context.Context
name string
currentMaster string
masters []string
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vidMap
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}
func NewMasterClient(ctx context.Context, clientName string, masters []string) *MasterClient {
return &MasterClient{
ctx: ctx,
name: clientName,
masters: masters,
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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(0).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(0).Infof("Connecting to master %v", master)
gprcErr := 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
}
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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(0).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 = ""
}
}
func withMasterClient(master string, fn func(client master_pb.SeaweedClient) error) error {
masterGrpcAddress, parseErr := util.ParseServerToGrpcAddress(master, 0)
if parseErr != nil {
return fmt.Errorf("failed to parse master grpc %v", master)
}
grpcConnection, err := util.GrpcDial(masterGrpcAddress)
if err != nil {
return fmt.Errorf("fail to dial %s: %v", master, err)
}
defer grpcConnection.Close()
client := master_pb.NewSeaweedClient(grpcConnection)
return fn(client)
}