Source code for airflow.providers.amazon.aws.transfers.exasol_to_s3

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"""Transfers data from Exasol database into a S3 Bucket."""

from tempfile import NamedTemporaryFile
from typing import Dict, Optional

from airflow.models import BaseOperator
from airflow.providers.amazon.aws.hooks.s3 import S3Hook
from airflow.providers.exasol.hooks.exasol import ExasolHook


[docs]class ExasolToS3Operator(BaseOperator): """ Export data from Exasol database to AWS S3 bucket. :param query_or_table: the sql statement to be executed or table name to export :type query_or_table: str :param key: S3 key that will point to the file :type key: str :param bucket_name: Name of the bucket in which to store the file :type bucket_name: str :param replace: A flag to decide whether or not to overwrite the key if it already exists. If replace is False and the key exists, an error will be raised. :type replace: bool :param encrypt: If True, the file will be encrypted on the server-side by S3 and will be stored in an encrypted form while at rest in S3. :type encrypt: bool :param gzip: If True, the file will be compressed locally :type gzip: bool :param acl_policy: String specifying the canned ACL policy for the file being uploaded to the S3 bucket. :type acl_policy: str :param query_params: Query parameters passed to underlying ``export_to_file`` method of :class:`~pyexasol.connection.ExaConnection`. :type query_params: dict :param export_params: Extra parameters passed to underlying ``export_to_file`` method of :class:`~pyexasol.connection.ExaConnection`. :type export_params: dict """
[docs] template_fields = ('query_or_table', 'key', 'bucket_name', 'query_params', 'export_params')
[docs] template_fields_renderers = {"query_or_table": "sql", "query_params": "json", "export_params": "json"}
[docs] template_ext = ('.sql',)
[docs] ui_color = '#ededed'
def __init__( self, *, query_or_table: str, key: str, bucket_name: Optional[str] = None, replace: bool = False, encrypt: bool = False, gzip: bool = False, acl_policy: Optional[str] = None, query_params: Optional[Dict] = None, export_params: Optional[Dict] = None, exasol_conn_id: str = 'exasol_default', aws_conn_id: str = 'aws_default', **kwargs, ) -> None: super().__init__(**kwargs) self.query_or_table = query_or_table self.key = key self.bucket_name = bucket_name self.replace = replace self.encrypt = encrypt self.gzip = gzip self.acl_policy = acl_policy self.query_params = query_params self.export_params = export_params self.exasol_conn_id = exasol_conn_id self.aws_conn_id = aws_conn_id
[docs] def execute(self, context): exasol_hook = ExasolHook(exasol_conn_id=self.exasol_conn_id) s3_hook = S3Hook(aws_conn_id=self.aws_conn_id) with NamedTemporaryFile("w+") as file: exasol_hook.export_to_file( filename=file.name, query_or_table=self.query_or_table, export_params=self.export_params, query_params=self.query_params, ) file.flush() self.log.info("Uploading the data as %s", self.key) s3_hook.load_file( filename=file.name, key=self.key, bucket_name=self.bucket_name, replace=self.replace, encrypt=self.encrypt, gzip=self.gzip, acl_policy=self.acl_policy, ) self.log.info("Data uploaded") return self.key

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