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from collections import namedtuple
from typing import Sequence, Dict
from time import sleep
import re
from airflow.contrib.hooks.azure_container_instance_hook import AzureContainerInstanceHook
from airflow.contrib.hooks.azure_container_registry_hook import AzureContainerRegistryHook
from airflow.contrib.hooks.azure_container_volume_hook import AzureContainerVolumeHook
from airflow.exceptions import AirflowException, AirflowTaskTimeout
from airflow.models import BaseOperator
from airflow.utils.decorators import apply_defaults
from azure.mgmt.containerinstance.models import (EnvironmentVariable,
VolumeMount,
ResourceRequests,
ResourceRequirements,
Container,
ContainerGroup)
from msrestazure.azure_exceptions import CloudError
[docs]Volume = namedtuple(
'Volume',
['conn_id', 'account_name', 'share_name', 'mount_path', 'read_only'],
)
[docs]DEFAULT_ENVIRONMENT_VARIABLES = {} # type: Dict[str, str]
[docs]DEFAULT_SECURED_VARIABLES = [] # type: Sequence[str]
[docs]DEFAULT_VOLUMES = [] # type: Sequence[Volume]
[docs]DEFAULT_MEMORY_IN_GB = 2.0
[docs]class AzureContainerInstancesOperator(BaseOperator):
"""
Start a container on Azure Container Instances
:param ci_conn_id: connection id of a service principal which will be used
to start the container instance
:type ci_conn_id: str
:param registry_conn_id: connection id of a user which can login to a
private docker registry. If None, we assume a public registry
:type registry_conn_id: str
:param resource_group: name of the resource group wherein this container
instance should be started
:type resource_group: str
:param name: name of this container instance. Please note this name has
to be unique in order to run containers in parallel.
:type name: str
:param image: the docker image to be used
:type image: str
:param region: the region wherein this container instance should be started
:type region: str
:param environment_variables: key,value pairs containing environment
variables which will be passed to the running container
:type environment_variables: dict
:param secured_variables: names of environmental variables that should not
be exposed outside the container (typically passwords).
:type secured_variables: [str]
:param volumes: list of ``Volume`` tuples to be mounted to the container.
Currently only Azure Fileshares are supported.
:type volumes: list[<conn_id, account_name, share_name, mount_path, read_only>]
:param memory_in_gb: the amount of memory to allocate to this container
:type memory_in_gb: double
:param cpu: the number of cpus to allocate to this container
:type cpu: double
:param gpu: GPU Resource for the container.
:type gpu: azure.mgmt.containerinstance.models.GpuResource
:param command: the command to run inside the container
:type command: [str]
:param container_timeout: max time allowed for the execution of
the container instance.
:type container_timeout: datetime.timedelta
**Example**::
AzureContainerInstancesOperator(
"azure_service_principal",
"azure_registry_user",
"my-resource-group",
"my-container-name-{{ ds }}",
"myprivateregistry.azurecr.io/my_container:latest",
"westeurope",
{"MODEL_PATH": "my_value",
"POSTGRES_LOGIN": "{{ macros.connection('postgres_default').login }}"
"POSTGRES_PASSWORD": "{{ macros.connection('postgres_default').password }}",
"JOB_GUID": "{{ ti.xcom_pull(task_ids='task1', key='guid') }}" },
['POSTGRES_PASSWORD'],
[("azure_wasb_conn_id",
"my_storage_container",
"my_fileshare",
"/input-data",
True),],
memory_in_gb=14.0,
cpu=4.0,
gpu=GpuResource(count=1, sku='K80'),
command=["/bin/echo", "world"],
container_timeout=timedelta(hours=2),
task_id="start_container"
)
"""
[docs] template_fields = ('name', 'image', 'command', 'environment_variables')
@apply_defaults
def __init__(self,
ci_conn_id,
registry_conn_id,
resource_group,
name,
image,
region,
environment_variables=None,
secured_variables=None,
volumes=None,
memory_in_gb=None,
cpu=None,
gpu=None,
command=None,
remove_on_error=True,
fail_if_exists=True,
*args,
**kwargs):
super(AzureContainerInstancesOperator, self).__init__(*args, **kwargs)
self.ci_conn_id = ci_conn_id
self.resource_group = resource_group
self.name = self._check_name(name)
self.image = image
self.region = region
self.registry_conn_id = registry_conn_id
self.environment_variables = environment_variables or DEFAULT_ENVIRONMENT_VARIABLES
self.secured_variables = secured_variables or DEFAULT_SECURED_VARIABLES
self.volumes = volumes or DEFAULT_VOLUMES
self.memory_in_gb = memory_in_gb or DEFAULT_MEMORY_IN_GB
self.cpu = cpu or DEFAULT_CPU
self.gpu = gpu
self.command = command
self.remove_on_error = remove_on_error
self.fail_if_exists = fail_if_exists
self._ci_hook = None
[docs] def execute(self, context):
# Check name again in case it was templated.
self._check_name(self.name)
self._ci_hook = AzureContainerInstanceHook(self.ci_conn_id)
if self.fail_if_exists:
self.log.info("Testing if container group already exists")
if self._ci_hook.exists(self.resource_group, self.name):
raise AirflowException("Container group exists")
if self.registry_conn_id:
registry_hook = AzureContainerRegistryHook(self.registry_conn_id)
image_registry_credentials = [registry_hook.connection, ]
else:
image_registry_credentials = None
environment_variables = []
for key, value in self.environment_variables.items():
if key in self.secured_variables:
e = EnvironmentVariable(name=key, secure_value=value)
else:
e = EnvironmentVariable(name=key, value=value)
environment_variables.append(e)
volumes = []
volume_mounts = []
for conn_id, account_name, share_name, mount_path, read_only in self.volumes:
hook = AzureContainerVolumeHook(conn_id)
mount_name = "mount-%d" % len(volumes)
volumes.append(hook.get_file_volume(mount_name,
share_name,
account_name,
read_only))
volume_mounts.append(VolumeMount(name=mount_name,
mount_path=mount_path,
read_only=read_only))
exit_code = 1
try:
self.log.info("Starting container group with %.1f cpu %.1f mem",
self.cpu, self.memory_in_gb)
if self.gpu:
self.log.info("GPU count: %.1f, GPU SKU: %s",
self.gpu.count, self.gpu.sku)
resources = ResourceRequirements(requests=ResourceRequests(
memory_in_gb=self.memory_in_gb,
cpu=self.cpu,
gpu=self.gpu))
container = Container(
name=self.name,
image=self.image,
resources=resources,
command=self.command,
environment_variables=environment_variables,
volume_mounts=volume_mounts)
container_group = ContainerGroup(
location=self.region,
containers=[container, ],
image_registry_credentials=image_registry_credentials,
volumes=volumes,
restart_policy='Never',
os_type='Linux')
self._ci_hook.create_or_update(self.resource_group, self.name, container_group)
self.log.info("Container group started %s/%s", self.resource_group, self.name)
exit_code = self._monitor_logging(self._ci_hook, self.resource_group, self.name)
self.log.info("Container had exit code: %s", exit_code)
if exit_code != 0:
raise AirflowException("Container had a non-zero exit code, %s"
% exit_code)
return exit_code
except CloudError:
self.log.exception("Could not start container group")
raise AirflowException("Could not start container group")
finally:
if exit_code == 0 or self.remove_on_error:
self.on_kill()
[docs] def on_kill(self):
if self.remove_on_error:
self.log.info("Deleting container group")
try:
self._ci_hook.delete(self.resource_group, self.name)
except Exception:
self.log.exception("Could not delete container group")
[docs] def _monitor_logging(self, ci_hook, resource_group, name):
last_state = None
last_message_logged = None
last_line_logged = None
while True:
try:
cg_state = self._ci_hook.get_state(resource_group, name)
instance_view = cg_state.containers[0].instance_view
# If there is no instance view, we show the provisioning state
if instance_view is not None:
c_state = instance_view.current_state
state, exit_code, detail_status = (c_state.state,
c_state.exit_code,
c_state.detail_status)
messages = [event.message for event in instance_view.events]
last_message_logged = self._log_last(messages, last_message_logged)
else:
state = cg_state.provisioning_state
exit_code = 0
detail_status = "Provisioning"
if state != last_state:
self.log.info("Container group state changed to %s", state)
last_state = state
if state in ["Running", "Terminated"]:
try:
logs = self._ci_hook.get_logs(resource_group, name)
last_line_logged = self._log_last(logs, last_line_logged)
except CloudError:
self.log.exception("Exception while getting logs from "
"container instance, retrying...")
if state == "Terminated":
self.log.info("Container exited with detail_status %s", detail_status)
return exit_code
if state == "Failed":
self.log.info("Azure provision failure")
return 1
except AirflowTaskTimeout:
raise
except CloudError as err:
if 'ResourceNotFound' in str(err):
self.log.warning("ResourceNotFound, container is probably removed "
"by another process "
"(make sure that the name is unique).")
return 1
else:
self.log.exception("Exception while getting container groups")
except Exception:
self.log.exception("Exception while getting container groups")
sleep(1)
[docs] def _log_last(self, logs, last_line_logged):
if logs:
# determine the last line which was logged before
last_line_index = 0
for i in range(len(logs) - 1, -1, -1):
if logs[i] == last_line_logged:
# this line is the same, hence print from i+1
last_line_index = i + 1
break
# log all new ones
for line in logs[last_line_index:]:
self.log.info(line.rstrip())
return logs[-1]
@staticmethod
[docs] def _check_name(name):
if '{{' in name:
# Let macros pass as they cannot be checked at construction time
return name
regex_check = re.match("[a-z0-9]([-a-z0-9]*[a-z0-9])?", name)
if regex_check is None or regex_check.group() != name:
raise AirflowException('ACI name must match regex [a-z0-9]([-a-z0-9]*[a-z0-9])? (like "my-name")')
if len(name) > 63:
raise AirflowException('ACI name cannot be longer than 63 characters')
return name