[XAPID-1070] add auth to requests sent by bundle downloader. Reuse http clients

bundle.go

diff --git a/bundle.go b/bundle.go
index b2206ea..622c8ed 100644
--- a/bundle.go
+++ b/bundle.go
@@ -48,12 +48,12 @@
 	apiMan                    apiManagerInterface
 	concurrentDownloads       int
 	markDeploymentFailedAfter time.Duration
-	bundleDownloadConnTimeout time.Duration
 	bundleRetryDelay          time.Duration
 	bundleCleanupDelay        time.Duration
 	downloadQueue             chan *DownloadRequest
 	isClosed                  *int32
 	workers                   []*BundleDownloader
+	client                    *http.Client
 }
 
 type blobServerResponse struct {
@@ -103,7 +103,7 @@
 		blobId:        id,
 		backoffFunc:   createBackoff(retryIn, maxBackOff),
 		markFailedAt:  markFailedAt,
-		connTimeout:   bm.bundleDownloadConnTimeout,
+		client:        bm.client,
 	}
 }
 
@@ -158,8 +158,8 @@
 	blobId        string
 	backoffFunc   func()
 	markFailedAt  time.Time
-	connTimeout   time.Duration
 	blobServerURL string
+	client        *http.Client
 }
 
 func (r *DownloadRequest) downloadBundle() error {
@@ -172,7 +172,7 @@
 		}
 	}
 
-	downloadedFile, err := downloadFromURI(r.blobServerURL, r.blobId, r.connTimeout)
+	downloadedFile, err := downloadFromURI(r.client, r.blobServerURL, r.blobId)
 
 	if err != nil {
 		log.Errorf("Unable to download blob file blobId=%s err:%v", r.blobId, err)
@@ -210,7 +210,7 @@
 	return path.Join(bundlePath, base64.StdEncoding.EncodeToString([]byte(blobId)))
 }
 
-func getSignedURL(blobServerURL string, blobId string, bundleDownloadConnTimeout time.Duration) (string, error) {
+func getSignedURL(client *http.Client, blobServerURL string, blobId string) (string, error) {
 
 	blobUri, err := url.Parse(blobServerURL)
 	if err != nil {
@@ -224,7 +224,7 @@
 
 	uri := blobUri.String()
 
-	surl, err := getURIReader(uri, bundleDownloadConnTimeout)
+	surl, err := getUriReaderWithAuth(client, uri)
 	if err != nil {
 		log.Errorf("Unable to get signed URL from BlobServer %s: %v", uri, err)
 		return "", err
@@ -248,12 +248,12 @@
 
 // downloadFromURI involves retrieving the signed URL for the blob, and storing the resource locally
 // after downloading the resource from GCS (via the signed URL)
-func downloadFromURI(blobServerURL string, blobId string, bundleDownloadConnTimeout time.Duration) (tempFileName string, err error) {
+func downloadFromURI(client *http.Client, blobServerURL string, blobId string) (tempFileName string, err error) {
 
 	var tempFile *os.File
 	log.Debugf("Downloading bundle: %s", blobId)
 
-	uri, err := getSignedURL(blobServerURL, blobId, bundleDownloadConnTimeout)
+	uri, err := getSignedURL(client, blobServerURL, blobId)
 	if err != nil {
 		log.Errorf("Unable to get signed URL for blobId {%s}, error : {%v}", blobId, err)
 		return
@@ -268,7 +268,7 @@
 	tempFileName = tempFile.Name()
 
 	var confReader io.ReadCloser
-	confReader, err = getURIReader(uri, bundleDownloadConnTimeout)
+	confReader, err = getUriReaderWithAuth(client, uri)
 	if err != nil {
 		log.Errorf("Unable to retrieve bundle %s: %v", uri, err)
 		return
@@ -286,12 +286,14 @@
 }
 
 // retrieveBundle retrieves bundle data from a URI
-func getURIReader(uriString string, bundleDownloadConnTimeout time.Duration) (io.ReadCloser, error) {
-
-	client := http.Client{
-		Timeout: bundleDownloadConnTimeout,
+func getUriReaderWithAuth(client *http.Client, uriString string) (io.ReadCloser, error) {
+	req, err := http.NewRequest("GET", uriString, nil)
+	if err != nil {
+		return nil, err
 	}
-	res, err := client.Get(uriString)
+	// add Auth
+	req.Header.Add("Authorization", getBearerToken())
+	res, err := client.Do(req)
 	if err != nil {
 		return nil, err
 	}

bundle_test.go

diff --git a/bundle_test.go b/bundle_test.go
index 0b8b535..30626f9 100644
--- a/bundle_test.go
+++ b/bundle_test.go
@@ -72,11 +72,13 @@
 			apiMan:                    dummyApiMan,
 			concurrentDownloads:       concurrentDownloads,
 			markDeploymentFailedAfter: 5 * time.Second,
-			bundleDownloadConnTimeout: time.Second,
 			bundleRetryDelay:          time.Second,
 			bundleCleanupDelay:        5 * time.Second,
 			downloadQueue:             make(chan *DownloadRequest, downloadQueueSize),
 			isClosed:                  new(int32),
+			client: &http.Client{
+				Timeout: time.Second,
+			},
 		}
 		testBundleMan.initializeBundleDownloading()
 		time.Sleep(100 * time.Millisecond)
@@ -101,7 +103,7 @@
 		// setup timeout
 		atomic.StoreInt32(blobServer.signedTimeout, 1)
 		atomic.StoreInt32(blobServer.blobTimeout, 1)
-		testBundleMan.bundleDownloadConnTimeout = 500 * time.Millisecond
+		testBundleMan.client.Timeout = 500 * time.Millisecond
 		testBundleMan.bundleRetryDelay = 50 * time.Millisecond
 
 		// download blobs
@@ -116,7 +118,7 @@
 		// setup timeout
 		atomic.StoreInt32(blobServer.signedTimeout, 1)
 		atomic.StoreInt32(blobServer.blobTimeout, 1)
-		testBundleMan.bundleDownloadConnTimeout = 100 * time.Millisecond
+		testBundleMan.client.Timeout = 100 * time.Millisecond
 		testBundleMan.bundleRetryDelay = 100 * time.Millisecond
 		testBundleMan.markDeploymentFailedAfter = 200 * time.Millisecond
 

init.go

diff --git a/init.go b/init.go
index d27b566..6384939 100644
--- a/init.go
+++ b/init.go
@@ -145,11 +145,13 @@
 		apiMan:                    apiMan,
 		concurrentDownloads:       concurrentDownloads,
 		markDeploymentFailedAfter: markDeploymentFailedAfter,
-		bundleDownloadConnTimeout: bundleDownloadConnTimeout,
 		bundleRetryDelay:          time.Second,
 		bundleCleanupDelay:        bundleCleanupDelay,
 		downloadQueue:             make(chan *DownloadRequest, downloadQueueSize),
 		isClosed:                  new(int32),
+		client: &http.Client{
+			Timeout: bundleDownloadConnTimeout,
+		},
 	}
 
 	bundleMan.initializeBundleDownloading()