Golang Downloader.DownloadWithChecksum方法代码示例

// DownloadTempWithChecksum is a DownloadTemp with checksum verification
//
// Temporary file would be already removed, so no need to cleanup
func DownloadTempWithChecksum(downloader aptly.Downloader, url string, expected utils.ChecksumInfo, ignoreMismatch bool) (*os.File, error) {
	tempdir, err := ioutil.TempDir(os.TempDir(), "aptly")
	if err != nil {
		return nil, err
	}
	defer os.RemoveAll(tempdir)

	tempfile := filepath.Join(tempdir, "buffer")

	if expected.Size != -1 && downloader.GetProgress() != nil {
		downloader.GetProgress().InitBar(expected.Size, true)
		defer downloader.GetProgress().ShutdownBar()
	}

	ch := make(chan error, 1)
	downloader.DownloadWithChecksum(url, tempfile, ch, expected, ignoreMismatch)

	err = <-ch

	if err != nil {
		return nil, err
	}

	file, err := os.Open(tempfile)
	if err != nil {
		return nil, err
	}

	return file, nil
}

//.........这里部分代码省略.........
	progress.Printf("Saving packages to database...\n")

	progress.InitBar(int64(list.Len()), false)

	packageCollection.db.StartBatch()
	count := 0

	// Save package meta information to DB
	err := list.ForEach(func(p *Package) error {
		progress.AddBar(1)
		count++
		if count > 1000 {
			count = 0
			err := packageCollection.db.FinishBatch()
			if err != nil {
				return err
			}
			packageCollection.db.StartBatch()
		}
		return packageCollection.Update(p)
	})
	if err != nil {
		return fmt.Errorf("unable to save packages to db: %s", err)
	}

	err = packageCollection.db.FinishBatch()
	if err != nil {
		return fmt.Errorf("unable to save packages to db: %s", err)
	}

	progress.ShutdownBar()

	progress.Printf("Building download queue...\n")

	// Build download queue
	queued := make(map[string]PackageDownloadTask, list.Len())
	count = 0
	downloadSize := int64(0)

	err = list.ForEach(func(p *Package) error {
		list, err := p.DownloadList(packagePool)
		if err != nil {
			return err
		}

		for _, task := range list {
			key := task.RepoURI + "-" + task.DestinationPath
			_, found := queued[key]
			if !found {
				count++
				downloadSize += task.Checksums.Size
				queued[key] = task
			}
		}

		return nil
	})
	if err != nil {
		return fmt.Errorf("unable to build download queue: %s", err)
	}

	repo.packageRefs = NewPackageRefListFromPackageList(list)
	// free up package list, we don't need it after this point
	list = nil

	progress.Printf("Download queue: %d items, %.2f GiB size\n", count, float64(downloadSize)/(1024.0*1024.0*1024.0))

	progress.InitBar(downloadSize, true)

	// Download all package files
	ch := make(chan error, len(queued))

	for _, task := range queued {
		d.DownloadWithChecksum(repo.PackageURL(task.RepoURI).String(), task.DestinationPath, ch, task.Checksums, ignoreMismatch)
	}

	// We don't need queued after this point
	queued = nil

	// Wait for all downloads to finish
	errors := make([]string, 0)

	for count > 0 {
		err = <-ch
		if err != nil {
			errors = append(errors, err.Error())
		}
		count--
	}

	progress.ShutdownBar()

	if len(errors) > 0 {
		return fmt.Errorf("download errors:\n  %s\n", strings.Join(errors, "\n  "))
	}

	repo.LastDownloadDate = time.Now()

	return nil
}

//.........这里部分代码省略.........
				return err
			}

			err = collectionFactory.PackageCollection().Update(p)
			if err != nil {
				return err
			}
		}

		progress.ShutdownBar()
	}

	var err error

	if repo.Filter != "" {
		progress.Printf("Applying filter...\n")

		list.PrepareIndex()

		emptyList := NewPackageList()
		emptyList.PrepareIndex()

		origPackages := list.Len()
		list, err = list.Filter([]PackageQuery{filterQuery}, repo.FilterWithDeps, emptyList, dependencyOptions, repo.Architectures)
		if err != nil {
			return err
		}

		progress.Printf("Packages filtered: %d -> %d.\n", origPackages, list.Len())
	}

	progress.Printf("Building download queue...\n")

	// Build download queue
	queued := make(map[string]PackageDownloadTask, list.Len())
	count := 0
	downloadSize := int64(0)

	err = list.ForEach(func(p *Package) error {
		list, err2 := p.DownloadList(packagePool)
		if err2 != nil {
			return err2
		}
		p.files = nil

		for _, task := range list {
			key := task.RepoURI + "-" + task.DestinationPath
			_, found := queued[key]
			if !found {
				count++
				downloadSize += task.Checksums.Size
				queued[key] = task
			}
		}

		return nil
	})
	if err != nil {
		return fmt.Errorf("unable to build download queue: %s", err)
	}

	repo.packageRefs = NewPackageRefListFromPackageList(list)
	// free up package list, we don't need it after this point
	list = nil

	progress.Printf("Download queue: %d items (%s)\n", count, utils.HumanBytes(downloadSize))

	progress.InitBar(downloadSize, true)

	// Download all package files
	ch := make(chan error, len(queued))

	for _, task := range queued {
		d.DownloadWithChecksum(repo.PackageURL(task.RepoURI).String(), task.DestinationPath, ch, task.Checksums, ignoreMismatch)
	}

	// We don't need queued after this point
	queued = nil

	// Wait for all downloads to finish
	errors := make([]string, 0)

	for count > 0 {
		err = <-ch
		if err != nil {
			errors = append(errors, err.Error())
		}
		count--
	}

	progress.ShutdownBar()

	if len(errors) > 0 {
		return fmt.Errorf("download errors:\n  %s\n", strings.Join(errors, "\n  "))
	}

	repo.LastDownloadDate = time.Now()

	return nil
}