package shell import ( "flag" "fmt" "github.com/chrislusf/seaweedfs/weed/filer" "github.com/chrislusf/seaweedfs/weed/pb/filer_pb" "github.com/chrislusf/seaweedfs/weed/pb/remote_pb" "github.com/chrislusf/seaweedfs/weed/util" "io" "sync" ) func init() { Commands = append(Commands, &commandRemoteCache{}) } type commandRemoteCache struct { } func (c *commandRemoteCache) Name() string { return "remote.cache" } func (c *commandRemoteCache) Help() string { return `cache the file content for mounted directories or files # assume a remote storage is configured to name "cloud1" remote.configure -name=cloud1 -type=s3 -access_key=xxx -secret_key=yyy # mount and pull one bucket remote.mount -dir=/xxx -remote=cloud1/bucket # after mount, run one of these command to cache the content of the files remote.cache -dir=/xxx remote.cache -dir=/xxx/some/sub/dir remote.cache -dir=/xxx/some/sub/dir -include=*.pdf remote.cache -dir=/xxx/some/sub/dir -exclude=*.txt remote.cache -maxSize=1024000 # cache files smaller than 100K remote.cache -maxAge=3600 # cache files less than 1 hour old This is designed to run regularly. So you can add it to some cronjob. If a file is already synchronized with the remote copy, the file will be skipped to avoid unnecessary copy. The actual data copying goes through volume severs in parallel. ` } func (c *commandRemoteCache) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) { remoteMountCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError) dir := remoteMountCommand.String("dir", "", "a directory in filer") concurrency := remoteMountCommand.Int("concurrent", 32, "concurrent file downloading") fileFiler := newFileFilter(remoteMountCommand) if err = remoteMountCommand.Parse(args); err != nil { return nil } mappings, localMountedDir, remoteStorageMountedLocation, remoteStorageConf, detectErr := detectMountInfo(commandEnv, writer, *dir) if detectErr != nil { jsonPrintln(writer, mappings) return detectErr } // pull content from remote if err = c.cacheContentData(commandEnv, writer, util.FullPath(localMountedDir), remoteStorageMountedLocation, util.FullPath(*dir), fileFiler, remoteStorageConf, *concurrency); err != nil { return fmt.Errorf("cache content data: %v", err) } return nil } func recursivelyTraverseDirectory(filerClient filer_pb.FilerClient, dirPath util.FullPath, visitEntry func(dir util.FullPath, entry *filer_pb.Entry) bool) (err error) { err = filer_pb.ReadDirAllEntries(filerClient, dirPath, "", func(entry *filer_pb.Entry, isLast bool) error { if entry.IsDirectory { if !visitEntry(dirPath, entry) { return nil } subDir := dirPath.Child(entry.Name) if err := recursivelyTraverseDirectory(filerClient, subDir, visitEntry); err != nil { return err } } else { if !visitEntry(dirPath, entry) { return nil } } return nil }) return } func shouldCacheToLocal(entry *filer_pb.Entry) bool { if entry.IsDirectory { return false } if entry.RemoteEntry == nil { return false } if entry.RemoteEntry.LastLocalSyncTsNs == 0 && entry.RemoteEntry.RemoteSize > 0 { return true } return false } func mayHaveCachedToLocal(entry *filer_pb.Entry) bool { if entry.IsDirectory { return false } if entry.RemoteEntry == nil { return false // should not uncache an entry that is not in remote } if entry.RemoteEntry.LastLocalSyncTsNs > 0 { return true } return false } func (c *commandRemoteCache) cacheContentData(commandEnv *CommandEnv, writer io.Writer, localMountedDir util.FullPath, remoteMountedLocation *remote_pb.RemoteStorageLocation, dirToCache util.FullPath, fileFilter *FileFilter, remoteConf *remote_pb.RemoteConf, concurrency int) error { var wg sync.WaitGroup limitedConcurrentExecutor := util.NewLimitedConcurrentExecutor(concurrency) var executionErr error traverseErr := recursivelyTraverseDirectory(commandEnv, dirToCache, func(dir util.FullPath, entry *filer_pb.Entry) bool { if !shouldCacheToLocal(entry) { return true // true means recursive traversal should continue } if fileFilter.matches(entry) { return true } wg.Add(1) limitedConcurrentExecutor.Execute(func() { defer wg.Done() fmt.Fprintf(writer, "Cache %+v ...\n", dir.Child(entry.Name)) remoteLocation := filer.MapFullPathToRemoteStorageLocation(localMountedDir, remoteMountedLocation, dir.Child(entry.Name)) if err := filer.DownloadToLocal(commandEnv, remoteConf, remoteLocation, dir, entry); err != nil { fmt.Fprintf(writer, "DownloadToLocal %+v: %v\n", remoteLocation, err) if executionErr == nil { executionErr = fmt.Errorf("DownloadToLocal %+v: %v\n", remoteLocation, err) } return } fmt.Fprintf(writer, "Cache %+v Done\n", dir.Child(entry.Name)) }) return true }) wg.Wait() if traverseErr != nil { return traverseErr } if executionErr != nil { return executionErr } return nil }