def from_json(cls, json_string):
parsed_json = json.loads(json_string)
configuration = MetricsGeneratorConfiguration()
configuration.metrics_path = ConfigurationHelper.dict_value_or_default(parsed_json, "metrics_base_path", cls.DEFAULT_METRICS_PATH)
configuration.services_path = ConfigurationHelper.dict_value_or_default(parsed_json, "services_base_path", cls.DEFAULT_SERVICES_PATH)
configuration.write_interval = ConfigurationHelper.dict_value_or_default(parsed_json, "write_interval", cls.DEFAULT_WRITE_INTERVAL)
etcd_endpoint_string = ConfigurationHelper.dict_value_or_default(parsed_json, "etcd_endpoint", cls.DEFAULT_ETCD_ENDPOINT)
configuration.etcd_endpoint = ServiceEndpoint.from_string(etcd_endpoint_string)
resource_dictionaries = ConfigurationHelper.dict_value_or_default(parsed_json, "resources", [])
configuration.resources = []
for resource_dictionary in resource_dictionaries:
resource = ConfigurationResource.from_dictionary(configuration.write_interval, resource_dictionary)
configuration.resources.append(resource)
return configuration
def from_dictionary(cls, dictionary, previous_phase=None):
phase = Phase()
phase.duration_seconds = ConfigurationHelper.dict_value_or_default(dictionary, "duration_seconds", 60)
phase.min_value = ConfigurationHelper.dict_value_or_default(dictionary, "min_value", 0)
phase.max_value = ConfigurationHelper.dict_value_or_default(dictionary, "max_value", 100)
if "start_time" in dictionary or previous_phase is None:
start_time_string = ConfigurationHelper.dict_value_or_fail(
dictionary,
"start_time",
"The first phase has to have a start_time attribute!"
)
phase.start_time = dateutil.parser.parse(start_time_string)
else:
phase.start_time = cls.calculate_start_time_depending_on_previous_phase(previous_phase)
return phase
def from_dictionary(cls, global_write_interval, dictionary):
resource = ConfigurationResource()
resource.write_interval = ConfigurationHelper.dict_value_or_default(
dictionary, "write_interval", global_write_interval)
resource.metric_name = ConfigurationHelper.dict_value_or_fail(
dictionary, "metric_name",
"Metric name missing in resource configuration!")
resource.metric_value_template = ConfigurationHelper.dict_value_or_default(
dictionary, "metric_value_template", None)
resource.service_type = ConfigurationHelper.dict_value_or_fail(
dictionary, "service_type",
"Service type missing in resource configuration!")
resource.instance_uuid = ConfigurationHelper.dict_value_or_default(
dictionary, "instance_uuid", cls.GENERATE_UUID_KEYWORD)
if resource.instance_uuid == cls.GENERATE_UUID_KEYWORD:
resource.instance_uuid = cls.generate_uuid()
elif resource.instance_uuid == cls.NO_UUID_KEYWORD:
resource.instance_uuid = ""
resource.instance_name = ConfigurationHelper.dict_value_or_default(
dictionary, "instance_name", None)
phases_dictionary = ConfigurationHelper.dict_value_or_fail(
dictionary, "phases",
"There are no phases defined for a resource!")
previous_phase = None
for phase_dictionary in phases_dictionary:
phase = Phase.from_dictionary(phase_dictionary,
previous_phase=previous_phase)
previous_phase = phase
resource.phases.append(phase)
return resource
def from_dictionary(cls, dictionary, previous_phase=None):
phase = Phase()
phase.duration_seconds = ConfigurationHelper.dict_value_or_default(
dictionary, "duration_seconds", 60)
phase.min_value = ConfigurationHelper.dict_value_or_default(
dictionary, "min_value", 0)
phase.max_value = ConfigurationHelper.dict_value_or_default(
dictionary, "max_value", 100)
if "start_time" in dictionary or previous_phase is None:
start_time_string = ConfigurationHelper.dict_value_or_fail(
dictionary, "start_time",
"The first phase has to have a start_time attribute!")
phase.start_time = dateutil.parser.parse(start_time_string)
else:
phase.start_time = cls.calculate_start_time_depending_on_previous_phase(
previous_phase)
return phase
def from_json(cls, json_string):
parsed_json = json.loads(json_string)
configuration = MetricsGeneratorConfiguration()
configuration.metrics_path = ConfigurationHelper.dict_value_or_default(
parsed_json, "metrics_base_path", cls.DEFAULT_METRICS_PATH)
configuration.services_path = ConfigurationHelper.dict_value_or_default(
parsed_json, "services_base_path", cls.DEFAULT_SERVICES_PATH)
configuration.write_interval = ConfigurationHelper.dict_value_or_default(
parsed_json, "write_interval", cls.DEFAULT_WRITE_INTERVAL)
etcd_endpoint_string = ConfigurationHelper.dict_value_or_default(
parsed_json, "etcd_endpoint", cls.DEFAULT_ETCD_ENDPOINT)
configuration.etcd_endpoint = ServiceEndpoint.from_string(
etcd_endpoint_string)
resource_dictionaries = ConfigurationHelper.dict_value_or_default(
parsed_json, "resources", [])
configuration.resources = []
for resource_dictionary in resource_dictionaries:
resource = ConfigurationResource.from_dictionary(
configuration.write_interval, resource_dictionary)
configuration.resources.append(resource)
return configuration
def from_dictionary(cls, global_write_interval, dictionary):
resource = ConfigurationResource()
resource.write_interval = ConfigurationHelper.dict_value_or_default(dictionary, "write_interval", global_write_interval)
resource.metric_name = ConfigurationHelper.dict_value_or_fail(
dictionary,
"metric_name",
"Metric name missing in resource configuration!"
)
resource.metric_value_template = ConfigurationHelper.dict_value_or_default(
dictionary,
"metric_value_template",
None
)
resource.service_type = ConfigurationHelper.dict_value_or_fail(
dictionary,
"service_type",
"Service type missing in resource configuration!"
)
resource.instance_uuid = ConfigurationHelper.dict_value_or_default(
dictionary,
"instance_uuid",
cls.GENERATE_UUID_KEYWORD
)
if resource.instance_uuid == cls.GENERATE_UUID_KEYWORD:
resource.instance_uuid = cls.generate_uuid()
elif resource.instance_uuid == cls.NO_UUID_KEYWORD:
resource.instance_uuid = ""
resource.instance_name = ConfigurationHelper.dict_value_or_default(
dictionary,
"instance_name",
None
)
phases_dictionary = ConfigurationHelper.dict_value_or_fail(
dictionary,
"phases",
"There are no phases defined for a resource!"
)
previous_phase = None
for phase_dictionary in phases_dictionary:
phase = Phase.from_dictionary(phase_dictionary, previous_phase=previous_phase)
previous_phase = phase
resource.phases.append(phase)
return resource
