Add ability to cancel builds that are in the waiting state

endpoints/api/build.py

@@ -9,7 +9,7 @@ from app import app, userfiles as user_files, build_logs, log_archive
 from endpoints.api import (RepositoryParamResource, parse_args, query_param, nickname, resource,
                            require_repo_read, require_repo_write, validate_json_request,
                            ApiResource, internal_only, format_date, api, Unauthorized, NotFound,
-                           path_param)
+                           path_param, InvalidRequest, require_repo_admin)
 from endpoints.common import start_build
 from endpoints.trigger import BuildTrigger
 from data import model, database
@@ -207,6 +207,31 @@ class RepositoryBuildList(RepositoryParamResource):
     return resp, 201, headers
 
 
+
+
+@resource('/v1/repository/<repopath:repository>/build/<build_uuid>')
+@path_param('repository', 'The full path of the repository. e.g. namespace/name')
+@path_param('build_uuid', 'The UUID of the build')
+class RepositoryBuildResource(RepositoryParamResource):
+  """ Resource for dealing with repository builds. """
+  @require_repo_admin
+  @nickname('cancelRepoBuild')
+  def delete(self, namespace, repository, build_uuid):
+    """ Cancels a repository build if it has not yet been picked up by a build worker. """
+    try:
+      build = model.get_repository_build(build_uuid)
+    except model.InvalidRepositoryBuildException:
+      raise NotFound()
+
+    if build.repository.name != repository or build.repository.namespace_user.username != namespace:
+      raise NotFound()
+
+    if model.cancel_repository_build(build):
+      return 'Okay', 201
+    else:
+      raise InvalidRequest('Build is currently running or has finished')
+
+
 @resource('/v1/repository/<repopath:repository>/build/<build_uuid>/status')
 @path_param('repository', 'The full path of the repository. e.g. namespace/name')
 @path_param('build_uuid', 'The UUID of the build')