mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-11-24 11:09:12 +08:00
96 lines
2.7 KiB
Go
96 lines
2.7 KiB
Go
package pb
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"github.com/chrislusf/seaweedfs/weed/glog"
|
|
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
|
|
"google.golang.org/grpc"
|
|
"io"
|
|
"time"
|
|
)
|
|
|
|
type ProcessMetadataFunc func(resp *filer_pb.SubscribeMetadataResponse) error
|
|
|
|
func FollowMetadata(filerAddress ServerAddress, grpcDialOption grpc.DialOption, clientName string,
|
|
pathPrefix string, additionalPathPrefixes []string, lastTsNs int64, selfSignature int32,
|
|
processEventFn ProcessMetadataFunc, fatalOnError bool) error {
|
|
|
|
err := WithFilerClient(filerAddress, grpcDialOption, makeFunc(clientName,
|
|
pathPrefix, additionalPathPrefixes, &lastTsNs, selfSignature, processEventFn, fatalOnError))
|
|
if err != nil {
|
|
return fmt.Errorf("subscribing filer meta change: %v", err)
|
|
}
|
|
return err
|
|
}
|
|
|
|
func WithFilerClientFollowMetadata(filerClient filer_pb.FilerClient,
|
|
clientName string, pathPrefix string, lastTsNs *int64, selfSignature int32,
|
|
processEventFn ProcessMetadataFunc, fatalOnError bool) error {
|
|
|
|
err := filerClient.WithFilerClient(makeFunc(clientName,
|
|
pathPrefix, nil, lastTsNs, selfSignature, processEventFn, fatalOnError))
|
|
if err != nil {
|
|
return fmt.Errorf("subscribing filer meta change: %v", err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func makeFunc(clientName string, pathPrefix string, additionalPathPrefixes []string, lastTsNs *int64, selfSignature int32,
|
|
processEventFn ProcessMetadataFunc, fatalOnError bool) func(client filer_pb.SeaweedFilerClient) error {
|
|
return func(client filer_pb.SeaweedFilerClient) error {
|
|
ctx, cancel := context.WithCancel(context.Background())
|
|
defer cancel()
|
|
stream, err := client.SubscribeMetadata(ctx, &filer_pb.SubscribeMetadataRequest{
|
|
ClientName: clientName,
|
|
PathPrefix: pathPrefix,
|
|
PathPrefixes: additionalPathPrefixes,
|
|
SinceNs: *lastTsNs,
|
|
Signature: selfSignature,
|
|
})
|
|
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 {
|
|
if fatalOnError {
|
|
glog.Fatalf("process %v: %v", resp, err)
|
|
} else {
|
|
glog.Errorf("process %v: %v", resp, err)
|
|
}
|
|
}
|
|
*lastTsNs = resp.TsNs
|
|
}
|
|
}
|
|
}
|
|
|
|
func AddOffsetFunc(processEventFn ProcessMetadataFunc, offsetInterval time.Duration, offsetFunc func(counter int64, offset int64) error) ProcessMetadataFunc {
|
|
var counter int64
|
|
var lastWriteTime time.Time
|
|
return func(resp *filer_pb.SubscribeMetadataResponse) error {
|
|
if err := processEventFn(resp); err != nil {
|
|
return err
|
|
}
|
|
counter++
|
|
if lastWriteTime.Add(offsetInterval).Before(time.Now()) {
|
|
counter = 0
|
|
lastWriteTime = time.Now()
|
|
if err := offsetFunc(counter, resp.TsNs); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
}
|