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

from __future__ import annotations

from tempfile import NamedTemporaryFile
from typing import TYPE_CHECKING, Sequence

from airflow.models import BaseOperator
from import S3Hook
from airflow.providers.exasol.hooks.exasol import ExasolHook

    from airflow.utils.context import Context

[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 :param key: S3 key that will point to the file :param bucket_name: Name of the bucket in which to store the file :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. :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. :param gzip: If True, the file will be compressed locally :param acl_policy: String specifying the canned ACL policy for the file being uploaded to the S3 bucket. :param query_params: Query parameters passed to underlying ``export_to_file`` method of :class:`~pyexasol.connection.ExaConnection`. :param export_params: Extra parameters passed to underlying ``export_to_file`` method of :class:`~pyexasol.connection.ExaConnection`. """
[docs] template_fields: Sequence[str] = ("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: Sequence[str] = (".sql",)
[docs] ui_color = "#ededed"
def __init__( self, *, query_or_table: str, key: str, bucket_name: str | None = None, replace: bool = False, encrypt: bool = False, gzip: bool = False, acl_policy: str | None = None, query_params: dict | None = None, export_params: dict | None = None, exasol_conn_id: str = "exasol_default", aws_conn_id: str | None = "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: 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(, query_or_table=self.query_or_table, export_params=self.export_params, query_params=self.query_params, ) file.flush()"Uploading the data as %s", self.key) s3_hook.load_file(, key=self.key, bucket_name=self.bucket_name, replace=self.replace, encrypt=self.encrypt, gzip=self.gzip, acl_policy=self.acl_policy, )"Data uploaded") return self.key

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