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package drive
import (
"fmt"
"io"
"os"
"time"
"path/filepath"
"google.golang.org/api/drive/v3"
"google.golang.org/api/googleapi"
)
type DownloadArgs struct {
Out io.Writer
Progress io.Writer
Id string
Path string
Force bool
Recursive bool
Stdout bool
}
func (self *Drive) Download(args DownloadArgs) error {
if args.Recursive {
return self.downloadRecursive(args)
}
f, err := self.service.Files.Get(args.Id).Fields("id", "name", "size", "mimeType", "md5Checksum").Do()
if err != nil {
return fmt.Errorf("Failed to get file: %s", err)
}
if isDir(f) {
return fmt.Errorf("'%s' is a directory, use --recursive to download directories", f.Name)
}
if !isBinary(f) {
return fmt.Errorf("'%s' is a google document and must be exported, see the export command", f.Name)
}
bytes, rate, err := self.downloadBinary(f, args)
if !args.Stdout {
fmt.Fprintf(args.Out, "Downloaded %s at %s/s, total %s\n", f.Id, formatSize(rate, false), formatSize(bytes, false))
}
return err
}
func (self *Drive) downloadRecursive(args DownloadArgs) error {
f, err := self.service.Files.Get(args.Id).Fields("id", "name", "size", "mimeType", "md5Checksum").Do()
if err != nil {
return fmt.Errorf("Failed to get file: %s", err)
}
if isDir(f) {
return self.downloadDirectory(f, args)
} else if isBinary(f) {
_, _, err = self.downloadBinary(f, args)
return err
}
return nil
}
func (self *Drive) downloadBinary(f *drive.File, args DownloadArgs) (int64, int64, error) {
res, err := self.service.Files.Get(f.Id).Download()
if err != nil {
return 0, 0, fmt.Errorf("Failed to download file: %s", err)
}
// Close body on function exit
defer res.Body.Close()
// Path to file
fpath := filepath.Join(args.Path, f.Name)
if !args.Stdout {
fmt.Fprintf(args.Out, "Downloading %s -> %s\n", f.Name, fpath)
}
return self.saveFile(saveFileArgs{
out: args.Out,
body: res.Body,
contentLength: res.ContentLength,
fpath: fpath,
force: args.Force,
stdout: args.Stdout,
progress: args.Progress,
})
}
type saveFileArgs struct {
out io.Writer
body io.Reader
contentLength int64
fpath string
force bool
stdout bool
progress io.Writer
}
func (self *Drive) saveFile(args saveFileArgs) (int64, int64, error) {
// Wrap response body in progress reader
srcReader := getProgressReader(args.body, args.progress, args.contentLength)
if args.stdout {
// Write file content to stdout
_, err := io.Copy(args.out, srcReader)
return 0, 0, err
}
// Check if file exists
if !args.force && fileExists(args.fpath) {
return 0, 0, fmt.Errorf("File '%s' already exists, use --force to overwrite", args.fpath)
}
// Ensure any parent directories exists
if err := mkdir(args.fpath); err != nil {
return 0, 0, err
}
// Download to tmp file
tmpPath := args.fpath + ".incomplete"
// Create new file
outFile, err := os.Create(tmpPath)
if err != nil {
return 0, 0, fmt.Errorf("Unable to create new file: %s", err)
}
started := time.Now()
// Save file to disk
bytes, err := io.Copy(outFile, srcReader)
if err != nil {
outFile.Close()
os.Remove(tmpPath)
return 0, 0, fmt.Errorf("Failed saving file: %s", err)
}
// Calculate average download rate
rate := calcRate(bytes, started, time.Now())
//if deleteSourceFile {
// self.Delete(args.Id)
//}
// Close File
outFile.Close()
// Rename tmp file to proper filename
return bytes, rate, os.Rename(tmpPath, args.fpath)
}
func (self *Drive) downloadDirectory(parent *drive.File, args DownloadArgs) error {
listArgs := listAllFilesArgs{
query: fmt.Sprintf("'%s' in parents", parent.Id),
fields: []googleapi.Field{"nextPageToken", "files(id,name)"},
}
files, err := self.listAllFiles(listArgs)
if err != nil {
return fmt.Errorf("Failed listing files: %s", err)
}
newPath := filepath.Join(args.Path, parent.Name)
for _, f := range files {
// Copy args and update changed fields
newArgs := args
newArgs.Path = newPath
newArgs.Id = f.Id
newArgs.Stdout = false
err = self.downloadRecursive(newArgs)
if err != nil {
return err
}
}
return nil
}
func isDir(f *drive.File) bool {
return f.MimeType == DirectoryMimeType
}
func isBinary(f *drive.File) bool {
return f.Md5Checksum != ""
}
|
