Limit the number of branches and tags loaded to 30

Fixes #380

endpoints/trigger.py

@@ -197,7 +197,7 @@ class BuildTriggerHandler(object):
     """
     raise NotImplementedError
 
-  def list_field_values(self, field_name):
+  def list_field_values(self, field_name, limit=None):
     """
     Lists all values for the given custom trigger field. For example, a trigger might have a
     field named "branches", and this method would return all branches.
@@ -434,7 +434,7 @@ class BitbucketBuildTrigger(BuildTriggerHandler):
 
     return data
 
-  def list_field_values(self, field_name):
+  def list_field_values(self, field_name, limit=None):
     source = self.config['build_source']
     (namespace, name) = source.split('/')
 
@@ -457,14 +457,22 @@ class BitbucketBuildTrigger(BuildTriggerHandler):
       if not result:
         return None
 
-      return data.keys()
+      tags = list(data.keys())
+      if limit:
+        tags = tags[0:limit]
+
+      return tags
 
     if field_name == 'branch_name':
       (result, data, _) = repository.get_branches()
       if not result:
         return None
 
-      return data.keys()
+      branches = list(data.keys())
+      if limit:
+        branches = branches[0:limit]
+
+      return branches
 
     return None
 
@@ -1039,7 +1047,7 @@ class GithubBuildTrigger(BuildTriggerHandler):
     return self._prepare_build(ref, commit_sha, True, repo=repo)
 
 
-  def list_field_values(self, field_name):
+  def list_field_values(self, field_name, limit=None):
     if field_name == 'refs':
       branches = self.list_field_values('branch_name')
       tags = self.list_field_values('tag_name')
@@ -1053,7 +1061,11 @@ class GithubBuildTrigger(BuildTriggerHandler):
         gh_client = self._get_client()
         source = config['build_source']
         repo = gh_client.get_repo(source)
-        return [tag.name for tag in repo.get_tags()]
+        gh_tags = repo.get_tags()
+        if limit:
+          gh_tags = repo.get_tags()[0:limit]
+
+        return [tag.name for tag in gh_tags]
       except GitHubBadCredentialsException:
         return []
       except GithubException:
@@ -1066,7 +1078,11 @@ class GithubBuildTrigger(BuildTriggerHandler):
         gh_client = self._get_client()
         source = config['build_source']
         repo = gh_client.get_repo(source)
-        branches = [branch.name for branch in repo.get_branches()]
+        gh_branches = repo.get_branches()
+        if limit:
+          gh_branches = repo.get_branches()[0:limit]
+
+        branches = [branch.name for branch in gh_branches]
 
         if not repo.default_branch in branches:
           branches.insert(0, repo.default_branch)
@@ -1417,7 +1433,7 @@ class GitLabBuildTrigger(BuildTriggerHandler):
 
     return contents
 
-  def list_field_values(self, field_name):
+  def list_field_values(self, field_name, limit=None):
     if field_name == 'refs':
       branches = self.list_field_values('branch_name')
       tags = self.list_field_values('tag_name')
@@ -1434,12 +1450,20 @@ class GitLabBuildTrigger(BuildTriggerHandler):
       tags = gl_client.getrepositorytags(repo['id'])
       if tags is False:
         return []
+
+      if limit:
+        tags = tags[0:limit]
+
       return [tag['name'] for tag in tags]
 
     if field_name == 'branch_name':
       branches = gl_client.getbranches(repo['id'])
       if branches is False:
         return []
+
+      if limit:
+        branches = branches[0:limit]
+
       return [branch['name'] for branch in branches]
 
     return None