seaweedfs/weed/filer2/meta_aggregator.go

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package filer2
import (
"context"
"fmt"
"io"
"sync"
"time"
"github.com/golang/protobuf/proto"
"google.golang.org/grpc"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/pb"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"github.com/chrislusf/seaweedfs/weed/util/log_buffer"
)
type MetaAggregator struct {
filers []string
grpcDialOption grpc.DialOption
MetaLogBuffer *log_buffer.LogBuffer
// notifying clients
ListenersLock sync.Mutex
ListenersCond *sync.Cond
}
func NewMetaAggregator(filers []string, grpcDialOption grpc.DialOption) *MetaAggregator {
t := &MetaAggregator{
filers: filers,
grpcDialOption: grpcDialOption,
}
t.ListenersCond = sync.NewCond(&t.ListenersLock)
t.MetaLogBuffer = log_buffer.NewLogBuffer(time.Minute, nil, func() {
t.ListenersCond.Broadcast()
})
return t
}
func (ma *MetaAggregator) StartLoopSubscribe(lastTsNs int64) {
for _, filer := range ma.filers {
go ma.subscribeToOneFiler(filer, lastTsNs)
}
}
func (ma *MetaAggregator) subscribeToOneFiler(filer string, lastTsNs int64) {
processEventFn := func(event *filer_pb.SubscribeMetadataResponse) error {
data, err := proto.Marshal(event)
if err != nil {
glog.Errorf("failed to marshal subscribed filer_pb.SubscribeMetadataResponse %+v: %v", event, err)
return err
}
dir := event.Directory
println("received meta change", dir, "size", len(data))
ma.MetaLogBuffer.AddToBuffer([]byte(dir), data)
return nil
}
for {
err := pb.WithFilerClient(filer, ma.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
stream, err := client.SubscribeLocalMetadata(context.Background(), &filer_pb.SubscribeMetadataRequest{
ClientName: "filer",
PathPrefix: "/",
SinceNs: lastTsNs,
})
if err != nil {
return fmt.Errorf("subscribe: %v", err)
}
for {
resp, listenErr := stream.Recv()
if listenErr == io.EOF {
return nil
}
if listenErr != nil {
return listenErr
}
if err := processEventFn(resp); err != nil {
return fmt.Errorf("process %v: %v", resp, err)
}
lastTsNs = resp.TsNs
}
})
if err != nil {
glog.V(0).Infof("subscribing remote %s meta change: %v", filer, err)
time.Sleep(1733 * time.Millisecond)
}
}
}