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120 lines
3.3 KiB
120 lines
3.3 KiB
package command
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import (
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"context"
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"fmt"
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"io"
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"path/filepath"
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"strings"
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"time"
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"github.com/chrislusf/seaweedfs/weed/pb"
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"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
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"github.com/chrislusf/seaweedfs/weed/security"
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"github.com/chrislusf/seaweedfs/weed/util"
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)
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func init() {
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cmdWatch.Run = runWatch // break init cycle
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}
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var cmdWatch = &Command{
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UsageLine: "watch [-filer=localhost:8888] [-target=/]",
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Short: "see recent changes on a filer",
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Long: `See recent changes on a filer.
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`,
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}
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var (
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watchFiler = cmdWatch.Flag.String("filer", "localhost:8888", "filer hostname:port")
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watchTarget = cmdWatch.Flag.String("pathPrefix", "/", "path to a folder or file, or common prefix for the folders or files on filer")
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watchStart = cmdWatch.Flag.Duration("timeAgo", 0, "start time before now. \"300ms\", \"1.5h\" or \"2h45m\". Valid time units are \"ns\", \"us\" (or \"µs\"), \"ms\", \"s\", \"m\", \"h\"")
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watchPattern = cmdWatch.Flag.String("pattern", "", "full path or just filename pattern, ex: \"/home/?opher\", \"*.pdf\", see https://golang.org/pkg/path/filepath/#Match ")
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)
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func runWatch(cmd *Command, args []string) bool {
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grpcDialOption := security.LoadClientTLS(util.GetViper(), "grpc.client")
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var filterFunc func(dir, fname string) bool
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if *watchPattern != "" {
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if strings.Contains(*watchPattern, "/") {
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println("watch path pattern", *watchPattern)
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filterFunc = func(dir, fname string) bool {
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matched, err := filepath.Match(*watchPattern, dir+"/"+fname)
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if err != nil {
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fmt.Printf("error: %v", err)
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}
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return matched
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}
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} else {
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println("watch file pattern", *watchPattern)
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filterFunc = func(dir, fname string) bool {
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matched, err := filepath.Match(*watchPattern, fname)
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if err != nil {
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fmt.Printf("error: %v", err)
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}
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return matched
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}
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}
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}
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shouldPrint := func(resp *filer_pb.SubscribeMetadataResponse) bool {
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if filterFunc == nil {
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return true
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}
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if resp.EventNotification.OldEntry == nil && resp.EventNotification.NewEntry == nil {
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return false
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}
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if resp.EventNotification.OldEntry != nil && filterFunc(resp.Directory, resp.EventNotification.OldEntry.Name) {
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return true
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}
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if resp.EventNotification.NewEntry != nil && filterFunc(resp.EventNotification.NewParentPath, resp.EventNotification.NewEntry.Name) {
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return true
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}
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return false
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}
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eachEntryFunc := func(resp *filer_pb.SubscribeMetadataResponse) error {
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fmt.Printf("dir:%s %+v\n", resp.Directory, resp.EventNotification)
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return nil
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}
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watchErr := pb.WithFilerClient(*watchFiler, grpcDialOption, 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: "watch",
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PathPrefix: *watchTarget,
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SinceNs: time.Now().Add(-*watchStart).UnixNano(),
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})
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if err != nil {
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return fmt.Errorf("listen: %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 !shouldPrint(resp) {
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continue
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}
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if err = eachEntryFunc(resp); err != nil {
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return err
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}
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}
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})
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if watchErr != nil {
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fmt.Printf("watch %s: %v\n", *watchFiler, watchErr)
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}
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return true
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}
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