mirror of https://github.com/chrislusf/seaweedfs
127 lines
3.6 KiB
Go
127 lines
3.6 KiB
Go
package pb
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import (
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"context"
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"fmt"
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"github.com/seaweedfs/seaweedfs/weed/glog"
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"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
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"github.com/seaweedfs/seaweedfs/weed/util"
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"google.golang.org/grpc"
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"io"
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"time"
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)
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type EventErrorType int
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const (
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TrivialOnError EventErrorType = iota
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FatalOnError
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RetryForeverOnError
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)
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// MetadataFollowOption is used to control the behavior of the metadata following
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// process. Part of it is used as a cursor to resume the following process.
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type MetadataFollowOption struct {
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ClientName string
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ClientId int32
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ClientEpoch int32
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SelfSignature int32
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PathPrefix string
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AdditionalPathPrefixes []string
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DirectoriesToWatch []string
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StartTsNs int64
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StopTsNs int64
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EventErrorType EventErrorType
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}
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type ProcessMetadataFunc func(resp *filer_pb.SubscribeMetadataResponse) error
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func FollowMetadata(filerAddress ServerAddress, grpcDialOption grpc.DialOption, option *MetadataFollowOption, processEventFn ProcessMetadataFunc) error {
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err := WithFilerClient(true, option.SelfSignature, filerAddress, grpcDialOption, makeSubscribeMetadataFunc(option, processEventFn))
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if err != nil {
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return fmt.Errorf("subscribing filer meta change: %v", err)
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}
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return err
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}
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func WithFilerClientFollowMetadata(filerClient filer_pb.FilerClient, option *MetadataFollowOption, processEventFn ProcessMetadataFunc) error {
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err := filerClient.WithFilerClient(true, makeSubscribeMetadataFunc(option, processEventFn))
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if err != nil {
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return fmt.Errorf("subscribing filer meta change: %v", err)
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}
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return nil
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}
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func makeSubscribeMetadataFunc(option *MetadataFollowOption, processEventFn ProcessMetadataFunc) func(client filer_pb.SeaweedFilerClient) error {
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return func(client filer_pb.SeaweedFilerClient) error {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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stream, err := client.SubscribeMetadata(ctx, &filer_pb.SubscribeMetadataRequest{
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ClientName: option.ClientName,
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PathPrefix: option.PathPrefix,
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PathPrefixes: option.AdditionalPathPrefixes,
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Directories: option.DirectoriesToWatch,
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SinceNs: option.StartTsNs,
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Signature: option.SelfSignature,
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ClientId: option.ClientId,
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ClientEpoch: option.ClientEpoch,
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UntilNs: option.StopTsNs,
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})
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if err != nil {
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return fmt.Errorf("subscribe: %v", err)
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}
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for {
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resp, listenErr := stream.Recv()
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if listenErr == io.EOF {
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return nil
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}
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if listenErr != nil {
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return listenErr
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}
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if err := processEventFn(resp); err != nil {
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switch option.EventErrorType {
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case TrivialOnError:
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glog.Errorf("process %v: %v", resp, err)
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case FatalOnError:
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glog.Fatalf("process %v: %v", resp, err)
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case RetryForeverOnError:
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util.RetryUntil("followMetaUpdates", func() error {
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return processEventFn(resp)
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}, func(err error) bool {
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glog.Errorf("process %v: %v", resp, err)
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return true
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})
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default:
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glog.Errorf("process %v: %v", resp, err)
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}
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}
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option.StartTsNs = resp.TsNs
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}
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}
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}
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func AddOffsetFunc(processEventFn ProcessMetadataFunc, offsetInterval time.Duration, offsetFunc func(counter int64, offset int64) error) ProcessMetadataFunc {
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var counter int64
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var lastWriteTime time.Time
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return func(resp *filer_pb.SubscribeMetadataResponse) error {
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if err := processEventFn(resp); err != nil {
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return err
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}
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counter++
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if lastWriteTime.Add(offsetInterval).Before(time.Now()) {
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lastWriteTime = time.Now()
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if err := offsetFunc(counter, resp.TsNs); err != nil {
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return err
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}
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counter = 0
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}
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return nil
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}
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}
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