seaweedfs/weed/shell/command_fs_meta_save.go

151 lines
3.6 KiB
Go

package shell
import (
"context"
"fmt"
"io"
"os"
"time"
"github.com/chrislusf/seaweedfs/weed/filer2"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"github.com/chrislusf/seaweedfs/weed/util"
"github.com/golang/protobuf/proto"
)
func init() {
Commands = append(Commands, &commandFsMetaSave{})
}
type commandFsMetaSave struct {
}
func (c *commandFsMetaSave) Name() string {
return "fs.meta.save"
}
func (c *commandFsMetaSave) Help() string {
return `save all directory and file meta data to a local file for metadata backup.
fs.meta.save / # save from the root
fs.meta.save /path/to/save # save from the directory /path/to/save
fs.meta.save . # save from current directory
fs.meta.save # save from current directory
The meta data will be saved into a local <filer_host>-<port>-<time>.meta file.
These meta data can be later loaded by fs.meta.load command,
This assumes there are no deletions, so this is different from taking a snapshot.
`
}
func (c *commandFsMetaSave) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
filerServer, filerPort, path, err := commandEnv.parseUrl(findInputDirectory(args))
if err != nil {
return err
}
ctx := context.Background()
return commandEnv.withFilerClient(ctx, filerServer, filerPort, func(client filer_pb.SeaweedFilerClient) error {
t := time.Now()
fileName := fmt.Sprintf("%s-%d-%4d%02d%02d-%02d%02d%02d.meta",
filerServer, filerPort, t.Year(), t.Month(), t.Day(), t.Hour(), t.Minute(), t.Second())
dst, err := os.OpenFile(fileName, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
return nil
}
defer dst.Close()
var dirCount, fileCount uint64
sizeBuf := make([]byte, 4)
err = doTraverse(ctx, writer, client, filer2.FullPath(path), func(parentPath filer2.FullPath, entry *filer_pb.Entry) error {
protoMessage := &filer_pb.FullEntry{
Dir: string(parentPath),
Entry: entry,
}
bytes, err := proto.Marshal(protoMessage)
if err != nil {
return fmt.Errorf("marshall error: %v", err)
}
util.Uint32toBytes(sizeBuf, uint32(len(bytes)))
dst.Write(sizeBuf)
dst.Write(bytes)
if entry.IsDirectory {
dirCount++
} else {
fileCount++
}
println(parentPath.Child(entry.Name))
return nil
})
if err == nil {
fmt.Fprintf(writer, "\ntotal %d directories, %d files", dirCount, fileCount)
fmt.Fprintf(writer, "\nmeta data for http://%s:%d%s is saved to %s\n", filerServer, filerPort, path, fileName)
}
return err
})
}
func doTraverse(ctx context.Context, writer io.Writer, client filer_pb.SeaweedFilerClient, parentPath filer2.FullPath, fn func(parentPath filer2.FullPath, entry *filer_pb.Entry) error) (err error) {
paginatedCount := -1
startFromFileName := ""
paginateSize := 1000
for paginatedCount == -1 || paginatedCount == paginateSize {
resp, listErr := client.ListEntries(ctx, &filer_pb.ListEntriesRequest{
Directory: string(parentPath),
Prefix: "",
StartFromFileName: startFromFileName,
InclusiveStartFrom: false,
Limit: uint32(paginateSize),
})
if listErr != nil {
err = listErr
return
}
paginatedCount = len(resp.Entries)
for _, entry := range resp.Entries {
if err = fn(parentPath, entry); err != nil {
return err
}
if entry.IsDirectory {
subDir := fmt.Sprintf("%s/%s", parentPath, entry.Name)
if parentPath == "/" {
subDir = "/" + entry.Name
}
if err = doTraverse(ctx, writer, client, filer2.FullPath(subDir), fn); err != nil {
return err
}
}
startFromFileName = entry.Name
}
}
return
}