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from __future__ import annotations
import re
from collections import namedtuple
from time import sleep
from typing import TYPE_CHECKING, Any, Sequence
from azure.mgmt.containerinstance.models import (
Container,
ContainerGroup,
ContainerGroupNetworkProfile,
ContainerPort,
EnvironmentVariable,
IpAddress,
ResourceRequests,
ResourceRequirements,
VolumeMount,
)
from msrestazure.azure_exceptions import CloudError
from airflow.exceptions import AirflowException, AirflowTaskTimeout
from airflow.models import BaseOperator
from airflow.providers.microsoft.azure.hooks.container_instance import AzureContainerInstanceHook
from airflow.providers.microsoft.azure.hooks.container_registry import AzureContainerRegistryHook
from airflow.providers.microsoft.azure.hooks.container_volume import AzureContainerVolumeHook
if TYPE_CHECKING:
from airflow.utils.context import Context
[docs]Volume = namedtuple(
"Volume",
["conn_id", "account_name", "share_name", "mount_path", "read_only"],
)
[docs]DEFAULT_ENVIRONMENT_VARIABLES: dict[str, str] = {}
[docs]DEFAULT_SECURED_VARIABLES: Sequence[str] = []
[docs]DEFAULT_VOLUMES: 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
:param registry_conn_id: connection id of a user which can login to a
private docker registry. For Azure use :ref:`Azure connection id<howto/connection:azure>`
:param resource_group: name of the resource group wherein this container
instance should be started
:param name: name of this container instance. Please note this name has
to be unique in order to run containers in parallel.
:param image: the docker image to be used
:param region: the region wherein this container instance should be started
:param environment_variables: key,value pairs containing environment
variables which will be passed to the running container
:param secured_variables: names of environmental variables that should not
be exposed outside the container (typically passwords).
:param volumes: list of ``Volume`` tuples to be mounted to the container.
Currently only Azure Fileshares are supported.
:param memory_in_gb: the amount of memory to allocate to this container
:param cpu: the number of cpus to allocate to this container
:param gpu: GPU Resource for the container.
:param command: the command to run inside the container
:param container_timeout: max time allowed for the execution of
the container instance.
:param tags: azure tags as dict of str:str
:param os_type: The operating system type required by the containers
in the container group. Possible values include: 'Windows', 'Linux'
:param restart_policy: Restart policy for all containers within the container group.
Possible values include: 'Always', 'OnFailure', 'Never'
:param ip_address: The IP address type of the container group.
:param network_profile: The network profile information for a container group.
**Example**::
AzureContainerInstancesOperator(
ci_conn_id = "azure_service_principal",
registry_conn_id = "azure_registry_user",
resource_group = "my-resource-group",
name = "my-container-name-{{ ds }}",
image = "myprivateregistry.azurecr.io/my_container:latest",
region = "westeurope",
environment_variables = {"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') }}" },
secured_variables = ['POSTGRES_PASSWORD'],
volumes = [("azure_container_instance_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"],
task_id="start_container"
)
"""
[docs] template_fields: Sequence[str] = ("name", "image", "command", "environment_variables")
[docs] template_fields_renderers = {"command": "bash", "environment_variables": "json"}
def __init__(
self,
*,
ci_conn_id: str,
registry_conn_id: str | None,
resource_group: str,
name: str,
image: str,
region: str,
environment_variables: dict | None = None,
secured_variables: str | None = None,
volumes: list | None = None,
memory_in_gb: Any | None = None,
cpu: Any | None = None,
gpu: Any | None = None,
command: list[str] | None = None,
remove_on_error: bool = True,
fail_if_exists: bool = True,
tags: dict[str, str] | None = None,
os_type: str = "Linux",
restart_policy: str = "Never",
ip_address: IpAddress | None = None,
ports: list[ContainerPort] | None = None,
network_profile: ContainerGroupNetworkProfile | None = None,
**kwargs,
) -> None:
super().__init__(**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: Any = None
self.tags = tags
self.os_type = os_type
if self.os_type not in ["Linux", "Windows"]:
raise AirflowException(
"Invalid value for the os_type argument. "
"Please set 'Linux' or 'Windows' as the os_type. "
f"Found `{self.os_type}`."
)
self.restart_policy = restart_policy
if self.restart_policy not in ["Always", "OnFailure", "Never"]:
raise AirflowException(
"Invalid value for the restart_policy argument. "
"Please set one of 'Always', 'OnFailure','Never' as the restart_policy. "
f"Found `{self.restart_policy}`"
)
self.ip_address = ip_address
self.ports = ports
self.network_profile = network_profile
[docs] def execute(self, context: Context) -> int:
# Check name again in case it was templated.
self._check_name(self.name)
self._ci_hook = AzureContainerInstanceHook(azure_conn_id=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: list | None = [
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: list[Volume | Volume] = []
volume_mounts: list[VolumeMount | VolumeMount] = []
for conn_id, account_name, share_name, mount_path, read_only in self.volumes:
hook = AzureContainerVolumeHook(conn_id)
mount_name = f"mount-{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)
)
if self.ip_address and not self.ports:
self.ports = [ContainerPort(port=80)]
self.log.info("Default port set. Container will listen on port 80")
container = Container(
name=self.name,
image=self.image,
resources=resources,
command=self.command,
environment_variables=environment_variables,
volume_mounts=volume_mounts,
ports=self.ports,
)
container_group = ContainerGroup(
location=self.region,
containers=[
container,
],
image_registry_credentials=image_registry_credentials,
volumes=volumes,
restart_policy=self.restart_policy,
os_type=self.os_type,
tags=self.tags,
ip_address=self.ip_address,
network_profile=self.network_profile,
)
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.resource_group, self.name)
self.log.info("Container had exit code: %s", exit_code)
if exit_code != 0:
raise AirflowException(f"Container had a non-zero exit code, {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) -> None:
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")
def _monitor_logging(self, resource_group: str, name: str) -> int:
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,
)
else:
state = cg_state.provisioning_state
exit_code = 0
detail_status = "Provisioning"
if instance_view is not None and instance_view.events is not None:
messages = [event.message for event in instance_view.events]
last_message_logged = self._log_last(messages, last_message_logged)
if state != last_state:
self.log.info("Container group state changed to %s", state)
last_state = state
if state in ["Running", "Terminated", "Succeeded"]:
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.error("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)
def _log_last(self, logs: list | None, last_line_logged: Any) -> Any | None:
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]
return None
@staticmethod
def _check_name(name: str) -> str:
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
