Source code for airflow.providers.cncf.kubernetes.utils.xcom_sidecar

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"""Attach a sidecar container that blocks the pod from completing until Airflow pulls result data."""

from __future__ import annotations

import copy

from kubernetes.client import models as k8s


[docs]class PodDefaults: """Static defaults for Pods."""
[docs] XCOM_MOUNT_PATH = "/airflow/xcom"
[docs] SIDECAR_CONTAINER_NAME = "airflow-xcom-sidecar"
[docs] XCOM_CMD = 'trap "exit 0" INT; while true; do sleep 1; done;'
[docs] VOLUME_MOUNT = k8s.V1VolumeMount(name="xcom", mount_path=XCOM_MOUNT_PATH)
[docs] VOLUME = k8s.V1Volume(name="xcom", empty_dir=k8s.V1EmptyDirVolumeSource())
[docs] SIDECAR_CONTAINER = k8s.V1Container( name=SIDECAR_CONTAINER_NAME, command=["sh", "-c", XCOM_CMD], image="alpine", volume_mounts=[VOLUME_MOUNT], resources=k8s.V1ResourceRequirements( requests={ "cpu": "1m", "memory": "10Mi", }, ), )
[docs]def add_xcom_sidecar( pod: k8s.V1Pod, *, sidecar_container_image: str | None = None, sidecar_container_resources: k8s.V1ResourceRequirements | dict | None = None, ) -> k8s.V1Pod: """Add sidecar.""" pod_cp = copy.deepcopy(pod) pod_cp.spec.volumes = pod.spec.volumes or [] pod_cp.spec.volumes.insert(0, PodDefaults.VOLUME) pod_cp.spec.containers[0].volume_mounts = pod_cp.spec.containers[0].volume_mounts or [] pod_cp.spec.containers[0].volume_mounts.insert(0, PodDefaults.VOLUME_MOUNT) sidecar = copy.deepcopy(PodDefaults.SIDECAR_CONTAINER) sidecar.image = sidecar_container_image or PodDefaults.SIDECAR_CONTAINER.image if sidecar_container_resources: sidecar.resources = sidecar_container_resources pod_cp.spec.containers.append(sidecar) return pod_cp

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