Fix upload session timeout (#294)

* Add empty request to avoid session timeout

Signed-off-by: Vaidotas Bauzys <vbauzys@vmware.com>

CHANGELOG.md

@@ -10,6 +10,7 @@ NOTES:
 
 BUGS FIXED:
 * Fix issue in Queries with vCD 10 version, which do not return network pool or provider VDC[#293](https://github.com/vmware/go-vcloud-director/pull/293)
+* Session timeout for media, catalog item upload  [#294](https://github.com/vmware/go-vcloud-director/pull/294)
 
 ## 2.6.0 (March 13, 2010)
 

govcd/upload.go

@@ -162,6 +162,8 @@ func newFileUploadRequest(client *Client, requestUrl string, filePart []byte, of
 // partDataSize - how much bytes will be uploaded
 // uploadDetails - file upload settings and data
 func uploadPartFile(client *Client, part []byte, partDataSize int64, uDetails uploadDetails) error {
+	// Avoids session time out, as the multi part upload is treated as one request
+	makeEmptyRequest(client)
 	request, err := newFileUploadRequest(client, uDetails.uploadLink, part, uDetails.uploadedBytes, partDataSize, uDetails.fileSizeToUpload)
 	if err != nil {
 		return err
@@ -178,6 +180,15 @@ func uploadPartFile(client *Client, part []byte, partDataSize int64, uDetails up
 	return nil
 }
 
+// call query for task which are very fast and optimised as UI calls it very often
+func makeEmptyRequest(client *Client) {
+	apiEndpoint := client.VCDHREF
+	apiEndpoint.Path += "/query?type=task&format=records&page=1&pageSize=5&"
+
+	_, _ = client.ExecuteRequest(apiEndpoint.String(), http.MethodGet,
+		"", "error making empty request: %s", nil, nil)
+}
+
 func getUploadLink(files *types.FilesList) (*url.URL, error) {
 	util.Logger.Printf("[TRACE] getUploadLink - Parsing upload link: %#v\n", files)