Use requests retry mechanism in the bugzilla sync script.

roles/distgit/pagure/templates/pagure-sync-bugzilla.py.j2

@@ -50,6 +50,24 @@ import yaml
 from six import string_types
 from fedora.client.fas2 import AccountSystem
 
+from requests.adapters import HTTPAdapter
+from requests.packages.urllib3.util.retry import Retry
+
+
+def retry_session():
+    session = requests.Session()
+    retry = Retry(
+        total=5,
+        read=5,
+        connect=5,
+        backoff_factor=0.3,
+        status_forcelist=(500, 502, 504),
+    )
+    adapter = HTTPAdapter(max_retries=retry)
+    session.mount('http://', adapter)
+    session.mount('https://', adapter)
+    return session
+
 BZSERVER = 'https://bugzilla.redhat.com'
 BZUSER = '{{ bugzilla_user }}'
 BZPASS = '{{ bugzilla_password }}'
@@ -436,6 +454,7 @@ def pagure_project_to_acl_schema(pagure_project, product):
     :param pagure_project: a dictionary of the JSON of a Pagure project
     :return: a dictionary of the content that the Bugzilla API would output
     """
+    session = retry_session()
     base_error_msg = ('The connection to "{0}" failed with the status code '
                       '{1} and output "{2}"')
     watchers_api_url = '{0}/api/0/{1}/{2}/watchers'.format(
@@ -443,7 +462,7 @@ def pagure_project_to_acl_schema(pagure_project, product):
         pagure_project['name'])
     if DRY_RUN:
         print('Querying {0}'.format(watchers_api_url))
-    watchers_rv = requests.get(watchers_api_url, timeout=60)
+    watchers_rv = session.get(watchers_api_url, timeout=60)
     if not watchers_rv.ok:
         error_msg = base_error_msg.format(
             watchers_api_url, watchers_rv.status_code, watchers_rv.text)
@@ -462,7 +481,7 @@ def pagure_project_to_acl_schema(pagure_project, product):
             MDAPIURL.rstrip('/'), pagure_project['name'])
         if DRY_RUN:
             print('Querying {0}'.format(mdapi_url))
-        mdapi_rv = requests.get(mdapi_url, timeout=60)
+        mdapi_rv = session.get(mdapi_url, timeout=60)
         if mdapi_rv.ok:
             mdapi_rv_json = mdapi_rv.json()
             summary = mdapi_rv_json['summary']
@@ -477,7 +496,7 @@ def pagure_project_to_acl_schema(pagure_project, product):
         PAGUREURL.rstrip('/'), BUGZILLA_OVERRIDE_REPO, project['namespace'],
         project['name'])
 
-    override_rv = requests.get(pagure_override_url, timeout=30)
+    override_rv = session.get(pagure_override_url, timeout=30)
     if override_rv.status_code == 200:
         override_yaml = yaml.load(override_rv.text)
         override_yaml = override_yaml.get('bugzilla_contact', {})
@@ -526,15 +545,17 @@ if __name__ == '__main__':
     pagure_rpms_api_url = ('{0}/api/0/projects?&namespace=rpms&page=1&'
                            'per_page=100'.format(
                                PAGURE_DIST_GIT_URL.rstrip('/')))
+    session = retry_session()
+
     while True:
         if DRY_RUN:
             print('Querying {0}'.format(pagure_rpms_api_url))
-        rv_json = requests.get(pagure_rpms_api_url, timeout=120).json()
+        rv_json = session.get(pagure_rpms_api_url, timeout=120).json()
         for project in rv_json['projects']:
             pagure_project_branches_api_url = (
                 '{0}/api/0/rpms/{1}/git/branches'
                 .format(PAGURE_DIST_GIT_URL.rstrip('/'), project['name']))
-            branch_rv_json = requests.get(
+            branch_rv_json = session.get(
                 pagure_project_branches_api_url, timeout=60).json()
             epel = False
             fedora = False
@@ -562,7 +583,7 @@ if __name__ == '__main__':
     while True:
         if DRY_RUN:
             print('Querying {0}'.format(pagure_container_api_url))
-        rv_json = requests.get(pagure_container_api_url, timeout=120).json()
+        rv_json = session.get(pagure_container_api_url, timeout=120).json()
         for project in rv_json['projects']:
             project_pkgdb_schema = pagure_project_to_acl_schema(project)
             projects_dict['Fedora Container'][project['name']] = \