Add Progress bar to OpensslImporter

Signed-off-by: Harsh Mishra <hmisraji07@gmail.com>

Author: harsh098

vulnerabilities/importers/openssl.py

@@ -16,6 +16,7 @@
 import requests
 from dateutil import parser as dateparser
 from packageurl import PackageURL
+from progress.bar import ChargingBar
 from univers.version_range import OpensslVersionRange
 from univers.versions import OpensslVersion
 
@@ -49,11 +50,20 @@ def advisory_data(self) -> Iterable[AdvisoryData]:
 
 def parse_vulnerabilities(xml_response) -> Iterable[AdvisoryData]:
     root = DET.fromstring(xml_response)
-    for xml_issue in root:
-        if xml_issue.tag == "issue":
-            advisory = to_advisory_data(xml_issue)
-            if advisory:
-                yield advisory
+    progress_bar_for_vulnerability_fetch = ChargingBar("\tFetching Vulnerabilities", max=len(root))
+    progress_bar_for_vulnerability_fetch.start()
+    try:
+        for xml_issue in root:
+            try:
+                if xml_issue.tag == "issue":
+                    advisory = to_advisory_data(xml_issue)
+                    if advisory:
+                        yield advisory
+            finally:
+                progress_bar_for_vulnerability_fetch.next()
+    finally:
+        progress_bar_for_vulnerability_fetch.finish()
+
 
 
 def to_advisory_data(xml_issue) -> AdvisoryData: