Source code for airflow.providers.sftp.sensors.sftp
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# to you under the Apache License, Version 2.0 (the
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#
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"""This module contains SFTP sensor."""
from __future__ import annotations
import os
from datetime import datetime
from typing import TYPE_CHECKING, Any, Callable, Sequence
from paramiko.sftp import SFTP_NO_SUCH_FILE
from airflow.providers.sftp.hooks.sftp import SFTPHook
from airflow.sensors.base import BaseSensorOperator, PokeReturnValue
from airflow.utils.timezone import convert_to_utc
if TYPE_CHECKING:
from airflow.utils.context import Context
[docs]class SFTPSensor(BaseSensorOperator):
"""
Waits for a file or directory to be present on SFTP.
:param path: Remote file or directory path
:param file_pattern: The pattern that will be used to match the file (fnmatch format)
:param sftp_conn_id: The connection to run the sensor against
:param newer_than: DateTime for which the file or file path should be newer than, comparison is inclusive
"""
[docs] template_fields: Sequence[str] = (
"path",
"newer_than",
)
def __init__(
self,
*,
path: str,
file_pattern: str = "",
newer_than: datetime | None = None,
sftp_conn_id: str = "sftp_default",
python_callable: Callable | None = None,
op_args: list | None = None,
op_kwargs: dict[str, Any] | None = None,
**kwargs,
) -> None:
super().__init__(**kwargs)
self.path = path
self.file_pattern = file_pattern
self.hook: SFTPHook | None = None
self.sftp_conn_id = sftp_conn_id
self.newer_than: datetime | None = newer_than
self.python_callable: Callable | None = python_callable
self.op_args = op_args or []
self.op_kwargs = op_kwargs or {}
[docs] def poke(self, context: Context) -> PokeReturnValue | bool:
self.hook = SFTPHook(self.sftp_conn_id)
self.log.info("Poking for %s, with pattern %s", self.path, self.file_pattern)
files_found = []
if self.file_pattern:
files_from_pattern = self.hook.get_files_by_pattern(self.path, self.file_pattern)
if files_from_pattern:
actual_files_to_check = [
os.path.join(self.path, file_from_pattern) for file_from_pattern in files_from_pattern
]
else:
return False
else:
actual_files_to_check = [self.path]
for actual_file_to_check in actual_files_to_check:
try:
mod_time = self.hook.get_mod_time(actual_file_to_check)
self.log.info("Found File %s last modified: %s", actual_file_to_check, mod_time)
except OSError as e:
if e.errno != SFTP_NO_SUCH_FILE:
raise e
continue
if self.newer_than:
_mod_time = convert_to_utc(datetime.strptime(mod_time, "%Y%m%d%H%M%S"))
_newer_than = convert_to_utc(self.newer_than)
if _newer_than <= _mod_time:
files_found.append(actual_file_to_check)
else:
files_found.append(actual_file_to_check)
self.hook.close_conn()
if not len(files_found):
return False
if self.python_callable is not None:
if self.op_kwargs:
self.op_kwargs["files_found"] = files_found
callable_return = self.python_callable(*self.op_args, **self.op_kwargs)
return PokeReturnValue(
is_done=True,
xcom_value={"files_found": files_found, "decorator_return_value": callable_return},
)
return True
