我对气流很陌生。我已经多次阅读了文档，在网上阅读了许多 S/O 问题和许多随机文章，但还没有解决这个问题。我有一种超级简单的感觉，我做错了。我有适用于 Windows 的 Docker，我提取了puckel/docker-airflow图像并运行了一个暴露了端口的容器，这样我就可以从我的主机上访问 UI。我正在运行另一个容器mcr.microsoft.com/mssql/server，我在该容器上恢复了 WideWorldImporters 示例数据库。在 Airflow UI 中，我已经能够成功地创建到该数据库的连接，甚至可以从 Data Profiling 部分对其进行查询。检查下面的图像：
连接创建
成功查询连接
因此，虽然这可行，但我的 dag 在第二个任务中失败了sqlData。这是代码：
from airflow.models import DAG
from airflow.operators.bash_operator import BashOperator
from airflow.operators.python_operator import PythonOperator
from airflow.operators.mssql_operator import MsSqlOperator
from datetime import timedelta, datetime
copyData = DAG(
dag_id='copyData',
schedule_interval='@once',
start_date=datetime(2019,1,1)
)
printHelloBash = BashOperator(
task_id = "print_hello_Bash",
bash_command = 'echo "Lets copy some data"',
dag = copyData
)
mssqlConnection = "WWI"
sqlData = MsSqlOperator(sql="select top 100 InvoiceDate, TotalDryItems from sales.invoices",
task_id="select_some_data",
mssql_conn_id=mssqlConnection,
database="WideWorldImporters",
dag = copyData,
depends_on_past=True
)
queryDataSuccess = BashOperator(
task_id = "confirm_data_queried",
bash_command = 'echo "We queried data!"',
dag = copyData
)
printHelloBash >> sqlData >> queryDataSuccess
最初的错误是：
*[2019-02-22 16:13:09,176] {{logging_mixin.py:95}} INFO - [2019-02-22 16:13:09,176] {{base_hook.py:83}} INFO - Using connection to: 172.17.0.3
[2019-02-22 16:13:09,186] {{models.py:1760}} ERROR - Could not create Fernet object: Incorrect padding
Traceback (most recent call last):
File "/usr/local/lib/python3.6/site-packages/airflow/models.py", line 171, in get_fernet
_fernet = Fernet(fernet_key.encode('utf-8'))
File "/usr/local/lib/python3.6/site-packages/cryptography/fernet.py", line 34, in __init__
key = base64.urlsafe_b64decode(key)
File "/usr/local/lib/python3.6/base64.py", line 133, in urlsafe_b64decode
return b64decode(s)
File "/usr/local/lib/python3.6/base64.py", line 87, in b64decode
return binascii.a2b_base64(s)
binascii.Error: Incorrect padding*
我注意到这与密码学有关，我继续运行pip install cryptographyand pip install airflow[crytpo]，两者都返回了完全相同的结果，通知我要求已经得到满足。最后，我找到了说我只需要生成一个 fernet_key 的东西。我的airflow.cfg 文件中的默认键是fernet_key = $FERNET_KEY. 所以从我运行的容器中的cli：
python -c "from cryptography.fernet import Fernet; print(Fernet.generate_key().decode())"
并得到了我替换的代码$FERNET_KEY。我重新启动了容器并重新运行了 dag，现在我的错误是：
[2019-02-22 16:22:13,641] {{models.py:1760}} ERROR -
Traceback (most recent call last):
File "/usr/local/lib/python3.6/site-packages/cryptography/fernet.py", line 106, in _verify_signature
h.verify(data[-32:])
File "/usr/local/lib/python3.6/site-packages/cryptography/hazmat/primitives/hmac.py", line 69, in verify
ctx.verify(signature)
File "/usr/local/lib/python3.6/site-packages/cryptography/hazmat/backends/openssl/hmac.py", line 73, in verify
raise InvalidSignature("Signature did not match digest.")
cryptography.exceptions.InvalidSignature: Signature did not match digest.
初始加密文档扫描中的哪个与兼容性有关？
我现在很迷茫，并决定问这个问题，看看我是否可能走错路来解决这个问题。任何帮助将不胜感激，因为 Airflow 看起来很棒。