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kubernetes_advanced_dags.py
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kubernetes_advanced_dags.py
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import os
from airflow import DAG
from airflow.models import Variable
from airflow.providers.cncf.kubernetes.operators.kubernetes_pod import (
KubernetesPodOperator,
)
from airflow.utils.dates import days_ago
from kubernetes.client import models as k8s
##
# Settings
###
INSTALL_SYNQDBT = True
PULL_DBT_PROJECT = True
# Kubernetes namespace
NAMESPACE = Variable.get("NAMESPACE", default_var="airflow-dbt")
# SYNQ_TOKEN is requred to authenticate with SYNQ
SYNQ_TOKEN = Variable.get("SYNQ_TOKEN", default_var=None)
# Path to synq binary
SYNQ_DBT_BIN_PATH = Variable.get(
"SYNQ_DBT_BIN_PATH", default_var="/usr/app/dbt/bin/synqdbt"
)
DBT_PROJECT_DIR = Variable.get(
"DBT_PROJECT_PATH", "/usr/app/dbt/gitsync/repo/dbt_example"
)
DBT_PROFILES_DIR = Variable.get(
"DBT_PROFILES_DIR", "/usr/app/dbt/gitsync/repo/dbt_example"
)
env_dict = {"SYNQ_TOKEN": SYNQ_TOKEN, "DBT_PROFILES_DIR": DBT_PROFILES_DIR}
# Config JSON object for overrides OPTIONAL
env_dict.update(Variable.get("CONFIG_OBJECT", {}, deserialize_json=True))
# Filter key value pairs that have value None
env_dict = {k: v for k, v in env_dict.items() if v is not None}
default_args = {
"start_date": days_ago(0),
"env": env_dict,
}
###
# Helper functions
###
# Install synq-dbt binary. OPTIONAL if you have synq-dbt in docker image.
# If your image does not include synq-dbt binary, you can install it before your Kubernetes Operators starts
def create_synq_dbt_init_container():
# Synq-dbt version to install
SYNQ_DBT_VERSION = Variable.get("SYNQ_DBT_VERSION", default_var="v1.4.0")
synqdbt_volume = k8s.V1Volume(
name="synqdbt-data", empty_dir=k8s.V1EmptyDirVolumeSource()
)
synqdbt_volume_mount = k8s.V1VolumeMount(
mount_path=os.path.dirname(SYNQ_DBT_BIN_PATH),
name="synqdbt-data",
sub_path=None,
read_only=False,
)
init_container_synqdbt_install = k8s.V1Container(
name="init-container-install-synqdbt",
image="alpine",
volume_mounts=[synqdbt_volume_mount],
command=["/bin/sh", "-cx"],
args=[
(
"apk add --no-cache wget; "
f"wget -O ./synq-dbt https:/getsynq/synq-dbt/releases/download/{SYNQ_DBT_VERSION}/synq-dbt-amd64-linux; "
"chmod +x ./synq-dbt; "
f"mv ./synq-dbt {SYNQ_DBT_BIN_PATH}; "
)
],
)
return synqdbt_volume, synqdbt_volume_mount, init_container_synqdbt_install
# Git pull your dbt repository before Kubernetes Operator starts.
# OPTIONAL if your dbt models are in your docker image.
def create_gitsync_init_container():
DBT_PROJECT_REPO = Variable.get(
"DBT_PROJECT_REPO", "https:/getsynq/synq-dbt-airflow.git"
)
DBT_PROJECT_BRANCH = Variable.get("DBT_PROJECT_BRANCH", "main")
dbt_project_volume = k8s.V1Volume(
name="dbt-data", empty_dir=k8s.V1EmptyDirVolumeSource()
)
dbt_project_volume_mount = k8s.V1VolumeMount(
mount_path="/usr/app/dbt/gitsync",
name="dbt-data",
sub_path=None,
read_only=False,
)
init_container_gitsync = k8s.V1Container(
name="init-container-gitsync",
image="registry.k8s.io/git-sync/git-sync:v3.6.2",
volume_mounts=[dbt_project_volume_mount],
args=[
f"--repo={DBT_PROJECT_REPO}",
f"--branch={DBT_PROJECT_BRANCH}",
"--root=/usr/app/dbt/gitsync",
"--dest=repo",
"--one-time",
],
)
return dbt_project_volume, dbt_project_volume_mount, init_container_gitsync
###
# DAGs
###
with DAG(
dag_id="kubernetes_advanced_dag",
default_args=default_args,
schedule_interval="@daily",
) as dag:
volumes = []
volume_mounts = []
init_containers = []
# Install synq-dbt binary. OPTIONAL if you have synq-dbt in docker image.
if INSTALL_SYNQDBT:
volume, mount, init_container = create_synq_dbt_init_container()
volumes.append(volume)
volume_mounts.append(mount)
init_containers.append(init_container)
# Git pull your dbt repository before Kubernetes Operator starts.
# OPTIONAL if your dbt models are in docker image.
if PULL_DBT_PROJECT:
volume, mount, init_container = create_gitsync_init_container()
volumes.append(volume)
volume_mounts.append(mount)
init_containers.append(init_container)
task = KubernetesPodOperator(
task_id="dbt_airflow_k8s_advanced",
name="dbt-task-advanced",
namespace=NAMESPACE,
in_cluster=True,
image="ghcr.io/dbt-labs/dbt-postgres:1.2.3",
cmds=["bash", "-cex"],
arguments=[
f"pushd {DBT_PROJECT_DIR}; "
f"{SYNQ_DBT_BIN_PATH} run; "
f"{SYNQ_DBT_BIN_PATH} test; "
],
env_vars=env_dict,
volumes=volumes,
volume_mounts=volume_mounts,
init_containers=init_containers,
is_delete_operator_pod=True,
)