/
dfget.go
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/
dfget.go
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/*
* Copyright 2020 The Dragonfly Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package dfget
import (
"context"
"errors"
"fmt"
"io"
"net/url"
"os"
"path"
"path/filepath"
"regexp"
"strings"
"time"
"github.com/gammazero/deque"
"github.com/go-http-utils/headers"
"github.com/schollz/progressbar/v3"
commonv1 "d7y.io/api/v2/pkg/apis/common/v1"
dfdaemonv1 "d7y.io/api/v2/pkg/apis/dfdaemon/v1"
"d7y.io/dragonfly/v2/client/config"
logger "d7y.io/dragonfly/v2/internal/dflog"
"d7y.io/dragonfly/v2/pkg/digest"
dfdaemonclient "d7y.io/dragonfly/v2/pkg/rpc/dfdaemon/client"
"d7y.io/dragonfly/v2/pkg/source"
pkgstrings "d7y.io/dragonfly/v2/pkg/strings"
)
func Download(cfg *config.DfgetConfig, client dfdaemonclient.V1) error {
var (
ctx = context.Background()
cancel context.CancelFunc
wLog = logger.With("url", cfg.URL)
downError error
)
wLog.Info("init success and start to download")
fmt.Println("init success and start to download")
if cfg.Timeout > 0 {
ctx, cancel = context.WithTimeout(ctx, cfg.Timeout)
} else {
ctx, cancel = context.WithCancel(ctx)
}
go func() {
downError = download(ctx, client, cfg, wLog)
cancel()
}()
<-ctx.Done()
if ctx.Err() == context.DeadlineExceeded {
return fmt.Errorf("download timeout(%s)", cfg.Timeout)
}
return downError
}
func download(ctx context.Context, client dfdaemonclient.V1, cfg *config.DfgetConfig, wLog *logger.SugaredLoggerOnWith) error {
if cfg.Recursive {
return recursiveDownload(ctx, client, cfg)
}
return singleDownload(ctx, client, cfg, wLog)
}
func singleDownload(ctx context.Context, client dfdaemonclient.V1, cfg *config.DfgetConfig, wLog *logger.SugaredLoggerOnWith) error {
hdr := parseHeader(cfg.Header)
if client == nil {
return downloadFromSource(ctx, cfg, hdr)
}
var (
start = time.Now()
stream dfdaemonv1.Daemon_DownloadClient
result *dfdaemonv1.DownResult
pb *progressbar.ProgressBar
request = newDownRequest(cfg, hdr)
downError error
)
if stream, downError = client.Download(ctx, request); downError != nil {
goto processError
}
if cfg.ShowProgress {
pb = newProgressBar(-1)
}
for {
if result, downError = stream.Recv(); downError != nil {
break
}
if result.CompletedLength > 0 && pb != nil {
_ = pb.Set64(int64(result.CompletedLength))
}
// success
if result.Done {
if pb != nil {
pb.Describe("Downloaded")
_ = pb.Close()
}
wLog.Infof("download from daemon success, length: %d bytes, cost: %d ms", result.CompletedLength, time.Since(start).Milliseconds())
fmt.Printf("finish total length %d bytes\n", result.CompletedLength)
break
}
}
processError:
if downError != nil && !cfg.KeepOriginalOffset {
wLog.Warnf("daemon downloads file error: %v", downError)
fmt.Printf("daemon downloads file error: %v\n", downError)
downError = downloadFromSource(ctx, cfg, hdr)
}
return downError
}
func downloadFromSource(ctx context.Context, cfg *config.DfgetConfig, hdr map[string]string) (err error) {
if cfg.DisableBackSource {
return errors.New("try to download from source but back source is disabled")
}
var (
wLog = logger.With("url", cfg.URL)
start = time.Now()
tempFile *os.File
response *source.Response
written int64
renameOK bool
)
wLog.Info("try to download from source and ignore rate limit")
fmt.Println("try to download from source and ignore rate limit")
if tempFile, err = os.CreateTemp(filepath.Dir(cfg.Output), ".df_"); err != nil {
return err
}
defer func() {
if !renameOK {
tempPath := path.Join(filepath.Dir(cfg.Output), tempFile.Name())
removeErr := os.Remove(tempPath)
if removeErr != nil {
wLog.Infof("remove temporary file %s error: %s", tempPath, removeErr)
fmt.Printf("remove temporary file %s error: %s\n", tempPath, removeErr)
}
}
if cerr := tempFile.Close(); cerr != nil {
err = errors.Join(err, cerr)
}
}()
downloadRequest, err := source.NewRequestWithContext(ctx, cfg.URL, hdr)
if err != nil {
return err
}
if response, err = source.Download(downloadRequest); err != nil {
return err
}
defer func() {
if cerr := response.Body.Close(); cerr != nil {
err = errors.Join(err, cerr)
}
}()
if err = response.Validate(); err != nil {
return err
}
if written, err = io.Copy(tempFile, response.Body); err != nil {
return err
}
if !pkgstrings.IsBlank(cfg.Digest) {
d, err := digest.Parse(cfg.Digest)
if err != nil {
return err
}
encoded, err := digest.HashFile(tempFile.Name(), d.Algorithm)
if err != nil {
return err
}
if encoded != "" && encoded != d.Encoded {
return fmt.Errorf("%s digest is not matched: real[%s] expected[%s]", d.Algorithm, encoded, d.Encoded)
}
}
// change file owner
if err = os.Chown(tempFile.Name(), os.Getuid(), os.Getgid()); err != nil {
return fmt.Errorf("change file owner to uid[%d] gid[%d]: %w", os.Getuid(), os.Getgid(), err)
}
if err = os.Rename(tempFile.Name(), cfg.Output); err != nil {
return err
}
renameOK = true
wLog.Infof("download from source success, length: %d bytes, cost: %d ms", written, time.Since(start).Milliseconds())
fmt.Printf("finish total length %d bytes\n", written)
return nil
}
func parseHeader(s []string) map[string]string {
hdr := make(map[string]string)
var key, value string
for _, h := range s {
idx := strings.Index(h, ":")
if idx > 0 {
key = strings.TrimSpace(h[:idx])
value = strings.TrimSpace(h[idx+1:])
hdr[key] = value
}
}
return hdr
}
func newDownRequest(cfg *config.DfgetConfig, hdr map[string]string) *dfdaemonv1.DownRequest {
var rg string
if r, ok := hdr[headers.Range]; ok {
rg = strings.TrimPrefix(r, "bytes=")
} else {
rg = cfg.Range
}
request := &dfdaemonv1.DownRequest{
Url: cfg.URL,
Output: cfg.Output,
Timeout: uint64(cfg.Timeout),
Limit: float64(cfg.RateLimit.Limit),
DisableBackSource: cfg.DisableBackSource,
UrlMeta: &commonv1.UrlMeta{
Digest: cfg.Digest,
Tag: cfg.Tag,
Range: rg,
Filter: cfg.Filter,
Header: hdr,
Application: cfg.Application,
Priority: commonv1.Priority(cfg.Priority),
},
Uid: int64(os.Getuid()),
Gid: int64(os.Getgid()),
KeepOriginalOffset: cfg.KeepOriginalOffset,
}
_url, err := url.Parse(cfg.URL)
if err == nil {
director, ok := source.HasDirector(_url.Scheme)
if ok {
err = director.Direct(_url, request.UrlMeta)
if err == nil {
// write back new url
request.Url = _url.String()
} else {
logger.Errorf("direct resource error: %s", err)
}
}
}
return request
}
func newProgressBar(max int64) *progressbar.ProgressBar {
return progressbar.DefaultBytes(-1, "Downloading")
}
func accept(u string, accept, reject string) bool {
if !acceptRegex(u, accept) {
logger.Debugf("url %s not accept by regex: %s", u, accept)
return false
}
if rejectRegex(u, reject) {
logger.Debugf("url %s rejected by regex: %s", u, reject)
return false
}
return true
}
func acceptRegex(u string, accept string) bool {
if accept == "" {
return true
}
return regexp.MustCompile(accept).Match([]byte(u))
}
func rejectRegex(u string, reject string) bool {
if reject == "" {
return false
}
return regexp.MustCompile(reject).Match([]byte(u))
}
// recursiveDownload breadth-first download all resources
func recursiveDownload(ctx context.Context, client dfdaemonclient.V1, cfg *config.DfgetConfig) error {
// if recursive level is 0, skip recursive level check
var skipLevel bool
if cfg.RecursiveLevel == 0 {
skipLevel = true
}
var queue deque.Deque[*config.DfgetConfig]
queue.PushBack(cfg)
downloadMap := map[url.URL]struct{}{}
for {
if queue.Len() == 0 {
break
}
parentCfg := queue.PopFront()
if !skipLevel {
if parentCfg.RecursiveLevel == 0 {
logger.Infof("%s recursive level reached, skip", parentCfg.URL)
continue
}
parentCfg.RecursiveLevel--
}
request, err := source.NewRequestWithContext(ctx, parentCfg.URL, parseHeader(parentCfg.Header))
if err != nil {
return err
}
// prevent loop downloading
if _, exist := downloadMap[*request.URL]; exist {
continue
}
downloadMap[*request.URL] = struct{}{}
urlEntries, err := source.List(request)
if err != nil {
logger.Errorf("url [%v] source lister error: %v", request.URL, err)
}
for _, urlEntry := range urlEntries {
childCfg := *parentCfg //create new cfg
childCfg.Output = path.Join(parentCfg.Output, urlEntry.Name)
fmt.Printf("%s\n", strings.TrimPrefix(childCfg.Output, cfg.Output))
u := urlEntry.URL
childCfg.URL = u.String()
if !accept(childCfg.URL, childCfg.RecursiveAcceptRegex, childCfg.RecursiveRejectRegex) {
logger.Infof("url %s is not accepted, skip", childCfg.URL)
continue
}
if urlEntry.IsDir {
logger.Infof("download directory %s to %s", childCfg.URL, childCfg.Output)
queue.PushBack(&childCfg)
continue
}
if childCfg.RecursiveList {
continue
}
childCfg.Recursive = false
// validate new dfget config
if err = childCfg.Validate(); err != nil {
logger.Errorf("validate failed: %s", err)
return err
}
logger.Infof("download file %s to %s", childCfg.URL, childCfg.Output)
if err = singleDownload(ctx, client, &childCfg, logger.With("url", childCfg.URL)); err != nil {
return err
}
}
}
return nil
}