Retry connecting to GitLab API on error

On connection error, retry to connect to the GitLab API.
Found this usefull with https://gitlab.freedesktop.org/
which showed several connection resets for my case.

Signed-off-by: Sandro Bonazzola <[email protected]>

did/plugins/gitlab.py

@@ -29,13 +29,16 @@
 import dateutil
 import requests
 from requests.packages.urllib3.exceptions import InsecureRequestWarning
+from time import sleep
 
 from did.base import Config, ReportError, get_token
 from did.stats import Stats, StatsGroup
 from did.utils import listed, log, pretty
 
 GITLAB_SSL_VERIFY = True
 GITLAB_API = 4
+GITLAB_MAX_RETRIES = 5
+GITLAB_RETRIES_INTERVAL = 5
 
 # Identifier padding
 PADDING = 3
@@ -61,7 +64,25 @@ def __init__(self, url, token, ssl_verify=GITLAB_SSL_VERIFY):
         self.project_issues = {}
 
     def _get_gitlab_api_raw(self, url):
-        return requests.get(url, headers=self.headers, verify=self.ssl_verify)
+        log.debug("Connecting to GitLab API at %s", url)
+        retries = 0
+        while True:
+            try:
+                api_raw = requests.get(url, headers=self.headers, verify=self.ssl_verify)
+                return api_raw
+            except requests.exceptions.ConnectionError as connection_error:
+                retries += 1
+                if retries > GITLAB_MAX_RETRIES:
+                    raise ReportError(
+                        f"Unable to connect to {url}. Error: {connection_error}"
+                        ) from connection_error
+                log.debug(
+                    "Retrying connection to %s in %s seconds due to %s",
+                    url,
+                    GITLAB_RETRIES_INTERVAL,
+                    connection_error
+                )
+                sleep(GITLAB_RETRIES_INTERVAL)
 
     def _get_gitlab_api(self, endpoint):
         url = '{0}/api/v{1}/{2}'.format(self.url, GITLAB_API, endpoint)