dfdaemon: specify context when invokes dfget

dfdaemon/downloader/dfget/dfget.go

@@ -17,6 +17,7 @@
 package dfget
 
 import (
+	"context"
 	"fmt"
 	netUrl "net/url"
 	"os/exec"
@@ -42,11 +43,11 @@ func NewGetter(cfg config.DFGetConfig) *DFGetter {
 	return &DFGetter{config: cfg}
 }
 
-// Download is the method of DFGetter to download by dragonfly.
-func (dfGetter *DFGetter) Download(url string, header map[string][]string, name string) (string, error) {
+// DownloadContext downloads the resources as specified in url.
+func (dfGetter *DFGetter) DownloadContext(ctx context.Context, url string, header map[string][]string, name string) (string, error) {
 	startTime := time.Now()
 	dstPath := filepath.Join(dfGetter.config.DFRepo, name)
-	cmd := dfGetter.getCommand(url, header, dstPath)
+	cmd := dfGetter.getCommand(ctx, url, header, dstPath)
 	err := cmd.Run()
 	if cmd.ProcessState.Success() {
 		log.Infof("dfget url:%s [SUCCESS] cost:%.3fs", url, time.Since(startTime).Seconds())
@@ -62,7 +63,7 @@ func (dfGetter *DFGetter) Download(url string, header map[string][]string, name
 
 // getCommand returns the command to download the given resource.
 func (dfGetter *DFGetter) getCommand(
-	url string, header map[string][]string, output string,
+	ctx context.Context, url string, header map[string][]string, output string,
 ) (cmd *exec.Cmd) {
 	args := []string{
 		"-u", url,
@@ -107,5 +108,5 @@ func (dfGetter *DFGetter) getCommand(
 		}
 	}
 
-	return exec.Command(dfGetter.config.DFPath, args...)
+	return exec.CommandContext(ctx, dfGetter.config.DFPath, args...)
 }

dfdaemon/downloader/downloader.go

@@ -16,11 +16,13 @@
 
 package downloader
 
+import "context"
+
 // Interface specifies on how an plugin can download a file.
 type Interface interface {
-	// Download download url file to file name
-	// return dst path and download error
-	Download(url string, header map[string][]string, name string) (string, error)
+	// DownloadContext downloads the resource as specified in url, and it accepts
+	// a context parameter so that it can handle timeouts correctly.
+	DownloadContext(ctx context.Context, url string, header map[string][]string, name string) (string, error)
 }
 
 // Factory is a function that returns a new downloader.

dfdaemon/transport/transport.go

@@ -17,6 +17,7 @@
 package transport
 
 import (
+	"context"
 	"crypto/tls"
 	"net"
 	"net/http"
@@ -133,7 +134,7 @@ func (roundTripper *DFRoundTripper) RoundTrip(req *http.Request) (*http.Response
 
 // download uses dfget to download.
 func (roundTripper *DFRoundTripper) download(req *http.Request, urlString string) (*http.Response, error) {
-	dstPath, err := roundTripper.downloadByGetter(urlString, req.Header, uuid.New())
+	dstPath, err := roundTripper.downloadByGetter(req.Context(), urlString, req.Header, uuid.New())
 	if err != nil {
 		logrus.Errorf("download fail: %v", err)
 		return nil, err
@@ -155,9 +156,9 @@ func (roundTripper *DFRoundTripper) download(req *http.Request, urlString string
 }
 
 // downloadByGetter is used to download file by DFGetter.
-func (roundTripper *DFRoundTripper) downloadByGetter(url string, header map[string][]string, name string) (string, error) {
+func (roundTripper *DFRoundTripper) downloadByGetter(ctx context.Context, url string, header map[string][]string, name string) (string, error) {
 	logrus.Infof("start download url:%s to %s in repo", url, name)
-	return roundTripper.Downloader.Download(url, header, name)
+	return roundTripper.Downloader.DownloadContext(ctx, url, header, name)
 }
 
 // needUseGetter is the default value for ShouldUseDfget, which downloads all