You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
139 lines
3.9 KiB
139 lines
3.9 KiB
package wdclient
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"math/rand"
|
|
"time"
|
|
|
|
"github.com/chrislusf/seaweedfs/weed/glog"
|
|
"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
|
|
"github.com/chrislusf/seaweedfs/weed/util"
|
|
"google.golang.org/grpc"
|
|
)
|
|
|
|
type MasterClient struct {
|
|
ctx context.Context
|
|
name string
|
|
currentMaster string
|
|
masters []string
|
|
grpcDialOption grpc.DialOption
|
|
|
|
vidMap
|
|
}
|
|
|
|
func NewMasterClient(ctx context.Context, grpcDialOption grpc.DialOption, clientName string, masters []string) *MasterClient {
|
|
return &MasterClient{
|
|
ctx: ctx,
|
|
name: clientName,
|
|
masters: masters,
|
|
grpcDialOption: grpcDialOption,
|
|
vidMap: newVidMap(),
|
|
}
|
|
}
|
|
|
|
func (mc *MasterClient) GetMaster() string {
|
|
return mc.currentMaster
|
|
}
|
|
|
|
func (mc *MasterClient) WaitUntilConnected() {
|
|
for mc.currentMaster == "" {
|
|
time.Sleep(time.Duration(rand.Int31n(200)) * time.Millisecond)
|
|
}
|
|
}
|
|
|
|
func (mc *MasterClient) KeepConnectedToMaster() {
|
|
glog.V(1).Infof("%s bootstraps with masters %v", mc.name, mc.masters)
|
|
for {
|
|
mc.tryAllMasters()
|
|
time.Sleep(time.Second)
|
|
}
|
|
}
|
|
|
|
func (mc *MasterClient) tryAllMasters() {
|
|
nextHintedLeader := ""
|
|
for _, master := range mc.masters {
|
|
|
|
nextHintedLeader = mc.tryConnectToMaster(master)
|
|
for nextHintedLeader != "" {
|
|
nextHintedLeader = mc.tryConnectToMaster(nextHintedLeader)
|
|
}
|
|
|
|
mc.currentMaster = ""
|
|
mc.vidMap = newVidMap()
|
|
}
|
|
}
|
|
|
|
func (mc *MasterClient) tryConnectToMaster(master string) (nextHintedLeader string) {
|
|
glog.V(1).Infof("%s Connecting to master %v", mc.name, master)
|
|
gprcErr := withMasterClient(context.Background(), master, mc.grpcDialOption, func(ctx context.Context, client master_pb.SeaweedClient) error {
|
|
|
|
stream, err := client.KeepConnected(ctx)
|
|
if err != nil {
|
|
glog.V(0).Infof("%s failed to keep connected to %s: %v", mc.name, master, err)
|
|
return err
|
|
}
|
|
|
|
if err = stream.Send(&master_pb.KeepConnectedRequest{Name: mc.name}); err != nil {
|
|
glog.V(0).Infof("%s failed to send to %s: %v", mc.name, master, err)
|
|
return err
|
|
}
|
|
|
|
glog.V(1).Infof("%s Connected to %v", mc.name, master)
|
|
mc.currentMaster = master
|
|
|
|
for {
|
|
volumeLocation, err := stream.Recv()
|
|
if err != nil {
|
|
glog.V(0).Infof("%s failed to receive from %s: %v", mc.name, master, err)
|
|
return err
|
|
}
|
|
|
|
// maybe the leader is changed
|
|
if volumeLocation.Leader != "" {
|
|
glog.V(0).Infof("redirected to leader %v", volumeLocation.Leader)
|
|
nextHintedLeader = volumeLocation.Leader
|
|
return nil
|
|
}
|
|
|
|
// process new volume location
|
|
loc := Location{
|
|
Url: volumeLocation.Url,
|
|
PublicUrl: volumeLocation.PublicUrl,
|
|
}
|
|
for _, newVid := range volumeLocation.NewVids {
|
|
glog.V(1).Infof("%s: %s adds volume %d", mc.name, loc.Url, newVid)
|
|
mc.addLocation(newVid, loc)
|
|
}
|
|
for _, deletedVid := range volumeLocation.DeletedVids {
|
|
glog.V(1).Infof("%s: %s removes volume %d", mc.name, loc.Url, deletedVid)
|
|
mc.deleteLocation(deletedVid, loc)
|
|
}
|
|
}
|
|
|
|
})
|
|
if gprcErr != nil {
|
|
glog.V(0).Infof("%s failed to connect with master %v: %v", mc.name, master, gprcErr)
|
|
}
|
|
return
|
|
}
|
|
|
|
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: %v", master, parseErr)
|
|
}
|
|
|
|
return util.WithCachedGrpcClient(ctx, func(ctx2 context.Context, grpcConnection *grpc.ClientConn) error {
|
|
client := master_pb.NewSeaweedClient(grpcConnection)
|
|
return fn(ctx2, client)
|
|
}, masterGrpcAddress, grpcDialOption)
|
|
|
|
}
|
|
|
|
func (mc *MasterClient) WithClient(ctx context.Context, fn func(client master_pb.SeaweedClient) error) error {
|
|
return withMasterClient(ctx, mc.currentMaster, mc.grpcDialOption, func(ctx context.Context, client master_pb.SeaweedClient) error {
|
|
return fn(client)
|
|
})
|
|
}
|