Merge ~smoser/git-ubuntu:faster2 into git-ubuntu:master

[Scott Moser]

[Nish Aravamudan (nacc)]

review: Approve

diff --git a/usd/source_information.py b/usd/source_information.py
index cd8f547..7d9be3b 100644
--- a/usd/source_information.py
+++ b/usd/source_information.py
@@ -2,6 +2,8 @@ import logging
 import re
 import sys
 import time
+_LP_LOGIN = None
+
 try:
     pkg = 'python3-launchpadlib'
     from launchpadlib.launchpad import Launchpad
@@ -12,6 +14,17 @@ except ImportError:
     sys.exit(1)
 
 
+def launchpad_login():
+    """Cache a single launchpad login here."""
+    global _LP_LOGIN
+    if _LP_LOGIN:
+        return _LP_LOGIN
+
+    _LP_LOGIN = Launchpad.login_anonymously('usd-importer', 'production',
+                                            version='devel')
+    return _LP_LOGIN
+
+
 class USDSourcePackageInformation:
     def __init__(self, spphr, retries=0, retry_backoffs=[],
                  workdir=None, dsc=None, files=list()):
@@ -139,7 +152,6 @@ class NoPublicationHistoryException(Exception):
 
 # An abstraction of an information source about source packages
 class USDSourceInformation(object):
-    launchpad = Launchpad.login_anonymously('usd-importer', 'production', version='devel')
     _series_list = None
 
     def __init__(self, dist_name, pkgname,
@@ -147,6 +159,7 @@ class USDSourceInformation(object):
                  retries,
                  retry_backoffs
                 ):
+        self.launchpad = launchpad_login()
         self.dist = self.launchpad.distributions[dist_name]
         self.pkgname = pkgname
         self.parse_pullfile(pull_overrides_filename)