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from typing import TYPE_CHECKING, Optional, Sequence
from urllib.parse import urlparse

from airflow.compat.functools import cached_property
from airflow.exceptions import AirflowException
from import OSSHook
from airflow.sensors.base import BaseSensorOperator

    from airflow.utils.context import Context

[docs]class OSSKeySensor(BaseSensorOperator): """ Waits for a key (a file-like instance on OSS) to be present in a OSS bucket. OSS being a key/value it does not support folders. The path is just a key a resource. :param bucket_key: The key being waited on. Supports full oss:// style url or relative path from root level. When it's specified as a full oss:// url, please leave bucket_name as `None`. :param region: OSS region :param bucket_name: OSS bucket name :param oss_conn_id: The Airflow connection used for OSS credentials. """
[docs] template_fields: Sequence[str] = ('bucket_key', 'bucket_name')
def __init__( self, bucket_key: str, region: str, bucket_name: Optional[str] = None, oss_conn_id: Optional[str] = 'oss_default', **kwargs, ): super().__init__(**kwargs) self.bucket_name = bucket_name self.bucket_key = bucket_key self.region = region self.oss_conn_id = oss_conn_id self.hook: Optional[OSSHook] = None
[docs] def poke(self, context: 'Context'): """ Check if the object exists in the bucket to pull key. @param self - the object itself @param context - the context of the object @returns True if the object exists, False otherwise """ if self.bucket_name is None: parsed_url = urlparse(self.bucket_key) if parsed_url.netloc == '': raise AirflowException('If key is a relative path from root, please provide a bucket_name') self.bucket_name = parsed_url.netloc self.bucket_key = parsed_url.path.lstrip('/') else: parsed_url = urlparse(self.bucket_key) if parsed_url.scheme != '' or parsed_url.netloc != '': raise AirflowException( 'If bucket_name is provided, bucket_key' ' should be relative path from root' ' level, rather than a full oss:// url' )'Poking for key : oss://%s/%s', self.bucket_name, self.bucket_key) return self.get_hook.object_exists(key=self.bucket_key, bucket_name=self.bucket_name)
[docs] def get_hook(self) -> OSSHook: """Create and return an OSSHook""" if self.hook: return self.hook self.hook = OSSHook(oss_conn_id=self.oss_conn_id, region=self.region) return self.hook

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