github.com/cs3org/reva/v2@v2.27.7/pkg/storage/fs/posix/tree/inotifywatcher.go (about)

     1  // Copyright 2018-2024 CERN
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  //
    15  // In applying this license, CERN does not waive the privileges and immunities
    16  // granted to it by virtue of its status as an Intergovernmental Organization
    17  // or submit itself to any jurisdiction.
    18  
    19  package tree
    20  
    21  import (
    22  	"fmt"
    23  
    24  	"github.com/pablodz/inotifywaitgo/inotifywaitgo"
    25  	"github.com/rs/zerolog"
    26  )
    27  
    28  type InotifyWatcher struct {
    29  	tree *Tree
    30  	log  *zerolog.Logger
    31  }
    32  
    33  func NewInotifyWatcher(tree *Tree, log *zerolog.Logger) *InotifyWatcher {
    34  	return &InotifyWatcher{
    35  		tree: tree,
    36  		log:  log,
    37  	}
    38  }
    39  
    40  func (iw *InotifyWatcher) Watch(path string) {
    41  	events := make(chan inotifywaitgo.FileEvent)
    42  	errors := make(chan error)
    43  
    44  	go inotifywaitgo.WatchPath(&inotifywaitgo.Settings{
    45  		Dir:        path,
    46  		FileEvents: events,
    47  		ErrorChan:  errors,
    48  		KillOthers: true,
    49  		Options: &inotifywaitgo.Options{
    50  			Recursive: true,
    51  			Events: []inotifywaitgo.EVENT{
    52  				inotifywaitgo.CREATE,
    53  				inotifywaitgo.MOVED_TO,
    54  				inotifywaitgo.MOVED_FROM,
    55  				inotifywaitgo.CLOSE_WRITE,
    56  				inotifywaitgo.DELETE,
    57  			},
    58  			Monitor: true,
    59  		},
    60  		Verbose: false,
    61  	})
    62  
    63  	for {
    64  		select {
    65  		case event := <-events:
    66  			if isLockFile(event.Filename) || isTrash(event.Filename) || iw.tree.isUpload(event.Filename) {
    67  				continue
    68  			}
    69  			for _, e := range event.Events {
    70  				go func() {
    71  					var err error
    72  					switch e {
    73  					case inotifywaitgo.DELETE:
    74  						err = iw.tree.Scan(event.Filename, ActionDelete, event.IsDir)
    75  					case inotifywaitgo.MOVED_FROM:
    76  						err = iw.tree.Scan(event.Filename, ActionMoveFrom, event.IsDir)
    77  					case inotifywaitgo.CREATE, inotifywaitgo.MOVED_TO:
    78  						err = iw.tree.Scan(event.Filename, ActionCreate, event.IsDir)
    79  					case inotifywaitgo.CLOSE_WRITE:
    80  						err = iw.tree.Scan(event.Filename, ActionUpdate, event.IsDir)
    81  					case inotifywaitgo.CLOSE:
    82  						// ignore, already handled by CLOSE_WRITE
    83  					default:
    84  						iw.log.Warn().Interface("event", event).Msg("unhandled event")
    85  						return
    86  					}
    87  					if err != nil {
    88  						iw.log.Error().Err(err).Str("path", event.Filename).Msg("error scanning file")
    89  					}
    90  				}()
    91  			}
    92  
    93  		case err := <-errors:
    94  			switch err.Error() {
    95  			case inotifywaitgo.NOT_INSTALLED:
    96  				panic("Error: inotifywait is not installed")
    97  			case inotifywaitgo.INVALID_EVENT:
    98  				// ignore
    99  			default:
   100  				fmt.Printf("Error: %s\n", err)
   101  			}
   102  		}
   103  	}
   104  }