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package drive
import (
"fmt"
"io"
"os"
"sort"
"time"
"path/filepath"
"google.golang.org/api/googleapi"
"google.golang.org/api/drive/v3"
)
type DownloadSyncArgs struct {
Out io.Writer
Progress io.Writer
RootId string
Path string
DryRun bool
DeleteExtraneous bool
Comparer FileComparer
}
func (self *Drive) DownloadSync(args DownloadSyncArgs) error {
fmt.Fprintln(args.Out, "Starting sync...")
started := time.Now()
// Get remote root dir
rootDir, err := self.getSyncRoot(args.RootId)
if err != nil {
return err
}
fmt.Fprintln(args.Out, "Collecting local and remote file information...")
files, err := self.prepareSyncFiles(args.Path, rootDir, args.Comparer)
if err != nil {
return err
}
fmt.Fprintf(args.Out, "Found %d local files and %d remote files\n", len(files.local), len(files.remote))
// Create missing directories
err = self.createMissingLocalDirs(files, args)
if err != nil {
return err
}
// Download missing files
err = self.downloadMissingFiles(files, args)
if err != nil {
return err
}
// Download files that has changed
err = self.downloadChangedFiles(files, args)
if err != nil {
return err
}
// Delete extraneous local files
if args.DeleteExtraneous {
err = self.deleteExtraneousLocalFiles(files, args)
if err != nil {
return err
}
}
fmt.Fprintf(args.Out, "Sync finished in %s\n", time.Since(started))
return nil
}
func (self *Drive) getSyncRoot(rootId string) (*drive.File, error) {
fields := []googleapi.Field{"id", "name", "mimeType", "appProperties"}
f, err := self.service.Files.Get(rootId).Fields(fields...).Do()
if err != nil {
return nil, fmt.Errorf("Failed to find root dir: %s", err)
}
// Ensure file is a directory
if !isDir(f) {
return nil, fmt.Errorf("Provided root id is not a directory")
}
// Ensure directory is a proper syncRoot
if _, ok := f.AppProperties["isSyncRoot"]; !ok {
return nil, fmt.Errorf("Provided id is not a sync root directory")
}
return f, nil
}
func (self *Drive) createMissingLocalDirs(files *syncFiles, args DownloadSyncArgs) error {
missingDirs := files.filterMissingLocalDirs()
missingCount := len(missingDirs)
if missingCount > 0 {
fmt.Fprintf(args.Out, "\n%d local directories are missing\n", missingCount)
}
// Sort directories so that the dirs with the shortest path comes first
sort.Sort(byRemotePathLength(missingDirs))
for i, rf := range missingDirs {
path, err := filepath.Abs(filepath.Join(args.Path, rf.relPath))
if err != nil {
return fmt.Errorf("Failed to determine local absolute path: %s", err)
}
fmt.Fprintf(args.Out, "[%04d/%04d] Creating directory: %s\n", i + 1, missingCount, path)
if args.DryRun {
continue
}
mkdir(path)
}
return nil
}
func (self *Drive) downloadMissingFiles(files *syncFiles, args DownloadSyncArgs) error {
missingFiles := files.filterMissingLocalFiles()
missingCount := len(missingFiles)
if missingCount > 0 {
fmt.Fprintf(args.Out, "\n%d local files are missing\n", missingCount)
}
for i, rf := range missingFiles {
remotePath := filepath.Join(files.root.file.Name, rf.relPath)
localPath, err := filepath.Abs(filepath.Join(args.Path, rf.relPath))
if err != nil {
return fmt.Errorf("Failed to determine local absolute path: %s", err)
}
fmt.Fprintf(args.Out, "[%04d/%04d] Downloading %s -> %s\n", i + 1, missingCount, remotePath, localPath)
if args.DryRun {
continue
}
err = self.downloadRemoteFile(rf.file.Id, localPath, args)
if err != nil {
return err
}
}
return nil
}
func (self *Drive) downloadChangedFiles(files *syncFiles, args DownloadSyncArgs) error {
changedFiles := files.filterChangedRemoteFiles()
changedCount := len(changedFiles)
if changedCount > 0 {
fmt.Fprintf(args.Out, "\n%d remote files has changed\n", changedCount)
}
for i, cf := range changedFiles {
remotePath := filepath.Join(files.root.file.Name, cf.remote.relPath)
localPath, err := filepath.Abs(filepath.Join(args.Path, cf.remote.relPath))
if err != nil {
return fmt.Errorf("Failed to determine local absolute path: %s", err)
}
fmt.Fprintf(args.Out, "[%04d/%04d] Downloading %s -> %s\n", i + 1, changedCount, remotePath, localPath)
if args.DryRun {
continue
}
err = self.downloadRemoteFile(cf.remote.file.Id, localPath, args)
if err != nil {
return err
}
}
return nil
}
func (self *Drive) downloadRemoteFile(id, fpath string, args DownloadSyncArgs) error {
res, err := self.service.Files.Get(id).Download()
if err != nil {
return fmt.Errorf("Failed to download file: %s", err)
}
// Close body on function exit
defer res.Body.Close()
// Wrap response body in progress reader
srcReader := getProgressReader(res.Body, args.Progress, res.ContentLength)
// Ensure any parent directories exists
if err = mkdir(fpath); err != nil {
return err
}
// Create new file
outFile, err := os.Create(fpath)
if err != nil {
return fmt.Errorf("Unable to create local file: %s", err)
}
// Close file on function exit
defer outFile.Close()
// Save file to disk
_, err = io.Copy(outFile, srcReader)
if err != nil {
return fmt.Errorf("Download was interrupted: %s", err)
}
return nil
}
func (self *Drive) deleteExtraneousLocalFiles(files *syncFiles, args DownloadSyncArgs) error {
extraneousFiles := files.filterExtraneousLocalFiles()
extraneousCount := len(extraneousFiles)
if extraneousCount > 0 {
fmt.Fprintf(args.Out, "\n%d local files are extraneous\n", extraneousCount)
}
// Sort files so that the files with the longest path comes first
sort.Sort(sort.Reverse(byLocalPathLength(extraneousFiles)))
for i, lf := range extraneousFiles {
fmt.Fprintf(args.Out, "[%04d/%04d] Deleting %s\n", i + 1, extraneousCount, lf.absPath)
if args.DryRun {
continue
}
err := os.Remove(lf.absPath)
if err != nil {
return fmt.Errorf("Failed to delete local file: %s", err)
}
}
return nil
}
|
