def deactivate_cluster(self, cluster):
"""
deactivates a cluster and allocates environments on it to other clusters
:param cluster: name of deactivated cluster
:return:
"""
# 1. get a list of environments allocated to the deactivated cluster
self.logger.info("Deactivating cluster " + cluster)
mongo_persistence_manager = MongoPersistenceManager(url=MONGOURL,
db=MONGODB,
uid=MONGOUID,
pwd=MONGOPWD)
mongo_persistence_manager.connect()
results = mongo_persistence_manager.find(ENVIRONMENTS_COLLECTION,
{CLUSTER_IDENTIFIER: cluster})
self.logger.info(
"Cluster has " + str(len(results)) +
" environments currently allocated - re-allocating these")
# 2. remove currennt allocations
mongo_persistence_manager.delete(ENVIRONMENTS_COLLECTION,
{CLUSTER_IDENTIFIER: cluster})
# 3. re-allocate
for record in results:
self.logger.info("Reallocating env " + record["env"] +
" for project " + record["project"])
envs = []
envs.append(record["env"])
self.allocate_env(record["project"], envs)
self.logger.info("Re-allocation complete")
def get_cluster(self, project, env):
"""
gets the name of the cluster associated with a specific project environment
:param project: name of project
:param env: name of environment
:return: name of cluster
"""
self.logger.info(
"Entering get_cluster with parameters project %s, env %s" %
(project, env))
# get record from the database
mongo_persistence_manager = MongoPersistenceManager(url=MONGOURL,
db=MONGODB,
uid=MONGOUID,
pwd=MONGOPWD)
mongo_persistence_manager.connect()
results = mongo_persistence_manager.find(ENVIRONMENTS_COLLECTION, {
PROJECT_IDENTIFIER: project,
ENVIRONMENT_IDENTIFIER: env
})
self.logger.info(
"Got record for project environment from environments collection "
+ str(results))
if len(results) == 0:
return None
else:
return results[0]["cluster"]
def allocate_env(self, project, envs):
"""
Allocates clusters to the environments required for a project
:param project: name of project
:param envs: array containing names of (valid) environments required, e.g., "DEV", "QA", etc.
:return: None (exception if any environment is invalid, or if no cluster is available for allocation)
"""
# 1. check if environments specified are valid - if not raise InvalidEnvironmentException
# 2. get list of environments already allocated to project, and do a diff between the allocated list and envs
# to get a list of new envs required (new_envs)
#
# 3. get list of clusters and count of environments allocated to each from database
# 4. Sort cluster list (least-to-highest)
# 5. for each item in new_envs
# allot item to cluster at top of list (i.e., cluster with least envs allotted)
# re-sort cluster list
# 1. check if environments specified are valid - if not raise InvalidEnvironmentException
self.logger.debug("Checking environments specified for validity")
if not envs:
return
if not all(env in VALID_ENVS for env in envs):
raise InvalidEnvironmentException()
self.logger.debug("Environments specified are valid")
# 2. get list of environments already allocated to project, and do a diff between the allocated list and envs
# to get a list of new envs required (new_envs)
self.logger.debug("Checking on new environments required")
new_envs = []
mongo_persistence_manager = MongoPersistenceManager(url=MONGOURL,
db=MONGODB,
uid=MONGOUID,
pwd=MONGOPWD)
mongo_persistence_manager.connect()
allocated_envs = mongo_persistence_manager.find(
ENVIRONMENTS_COLLECTION, {PROJECT_IDENTIFIER: project})
for env in envs:
found = False
for i in range(len(allocated_envs)):
if env == allocated_envs[i][ENVIRONMENT_IDENTIFIER]:
found = True
break
if not found:
new_envs.append(env)
self.logger.debug(
"Checked on new environments required. New environments are " +
str(new_envs))
# 3. get list of clusters and count of environments allocated to each from database
self.logger.debug(
"Getting list of currently allocated environments from database")
# get a list of currently available clusters
clusters = mongo_persistence_manager.find(CLUSTERS_COLLECTION,
{"activationStatus": True})
if len(clusters) == 0:
raise NoClustersPresentException()
# get a list of environments to calculate count of each cluster
self.logger.debug(
"Getting allocated environment count for eqach cluster")
current_envs = mongo_persistence_manager.find(ENVIRONMENTS_COLLECTION,
{})
self.logger.debug("Got environments from database: " +
str(len(current_envs)))
env_count = {}
for cluster in clusters:
cluster_name = cluster["name"]
env_count[cluster_name] = 0
for record in current_envs:
env_cluster_name = record[CLUSTER_IDENTIFIER]
if cluster_name == env_cluster_name:
env_count[cluster_name] = env_count[cluster_name] + 1
self.logger.debug("Got list of allocated environments: " +
str(env_count))
# 4. Sort cluster list (least-to-highest)
self.logger.debug("Sorting list of clusters by environments allocated")
sorted_cluster_count = OrderedDict(
sorted(env_count.items(), key=lambda t: t[1]))
self.logger.debug("Sorted. List: " + str(sorted_cluster_count))
# 5. for each item in new_envs
# allot item to cluster at top of list (i.e., cluster with least envs allotted)
# re-sort cluster list
self.logger.debug("Allocating new environments to clusters")
for new_env in new_envs:
cluster_name = list(sorted_cluster_count.keys())[0]
orig_count = sorted_cluster_count[cluster_name]
self.add_env(project, new_env, cluster_name)
sorted_cluster_count[cluster_name] = orig_count + 1
sorted_cluster_count = OrderedDict(
sorted(sorted_cluster_count.items(), key=lambda t: t[1]))
self.logger.debug("Allocated. New sorted list is " +
str(sorted_cluster_count))
return