mirror of
https://github.com/seaweedfs/seaweedfs.git
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117 lines
3.6 KiB
Go
117 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/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
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"github.com/chrislusf/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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type ProcessMetadataFunc func(resp *filer_pb.SubscribeMetadataResponse) error
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func FollowMetadata(filerAddress ServerAddress, grpcDialOption grpc.DialOption, clientName string, clientId int32, clientEpoch int32,
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pathPrefix string, additionalPathPrefixes []string, lastTsNs int64, untilTsNs int64, selfSignature int32,
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processEventFn ProcessMetadataFunc, eventErrorType EventErrorType) error {
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err := WithFilerClient(true, filerAddress, grpcDialOption, makeSubscribeMetadataFunc(
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clientName, clientId, clientEpoch,
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pathPrefix, additionalPathPrefixes, &lastTsNs, untilTsNs, selfSignature, processEventFn, eventErrorType))
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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,
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clientName string, clientId int32, clientEpoch int32, pathPrefix string, lastTsNs *int64, untilTsNs int64, selfSignature int32,
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processEventFn ProcessMetadataFunc, eventErrorType EventErrorType) error {
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err := filerClient.WithFilerClient(true, makeSubscribeMetadataFunc(clientName, clientId, clientEpoch, pathPrefix, nil, lastTsNs, untilTsNs, selfSignature, processEventFn, eventErrorType))
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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(clientName string, clientId int32, clientEpoch int32, pathPrefix string, additionalPathPrefixes []string, lastTsNs *int64, untilTsNs int64, selfSignature int32, processEventFn ProcessMetadataFunc, eventErrorType EventErrorType) 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: clientName,
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PathPrefix: pathPrefix,
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PathPrefixes: additionalPathPrefixes,
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SinceNs: *lastTsNs,
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Signature: selfSignature,
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ClientId: clientId,
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ClientEpoch: clientEpoch,
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UntilNs: untilTsNs,
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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 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.RetryForever("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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*lastTsNs = 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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