Add support for downloading content

Add support for downloading content for creating
the merged helm charts. This api will be used mainly
by the profile api to create a converged chart which
will then be created by the instantiation code
P2: Add unit tests for archive.go
    Add download method for profile.go
    Update comments for download method
P3: Add unit test for empty files
P4: Add unit tests for Download functions
P5: Rebase against new folder structure

Issue-ID: MULTICLOUD-291
Change-Id: I9779eaf95366f527f0360eaddea663722c13b196
Signed-off-by: Kiran Kamineni <kiran.k.kamineni@intel.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/src/k8splugin/internal/rb/definition.go b/src/k8splugin/internal/rb/definition.go
index 8a26332b..19844990 100644
--- a/src/k8splugin/internal/rb/definition.go
+++ b/src/k8splugin/internal/rb/definition.go
@@ -162,3 +162,34 @@ func (v *DefinitionClient) Upload(id string, inp []byte) error {
 
 	return nil
 }
+
+// Download the contents of the resource bundle definition from DB
+// Returns a byte array of the contents which is used by the
+// ExtractTarBall code to create the folder structure on disk
+func (v *DefinitionClient) Download(id string) ([]byte, error) {
+
+	//ignore the returned data here
+	//Check if id is valid
+	_, err := v.Get(id)
+	if err != nil {
+		return nil, pkgerrors.Errorf("Invalid Definition ID provided: %s", err.Error())
+	}
+
+	value, err := db.DBconn.Read(v.storeName, id, v.tagContent)
+	if err != nil {
+		return nil, pkgerrors.Wrap(err, "Get Resource Bundle definition content")
+	}
+
+	if value != nil {
+		//Decode the string from base64
+		out, err := base64.StdEncoding.DecodeString(string(value))
+		if err != nil {
+			return nil, pkgerrors.Wrap(err, "Decode base64 string")
+		}
+
+		if out != nil && len(out) != 0 {
+			return out, nil
+		}
+	}
+	return nil, pkgerrors.New("Error downloading Definition content")
+}