Source code for airflow.sensors.filesystem

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from __future__ import annotations

import datetime
import os
from functools import cached_property
from glob import glob
from typing import TYPE_CHECKING, Sequence

from airflow.configuration import conf
from airflow.exceptions import AirflowException
from airflow.hooks.filesystem import FSHook
from airflow.sensors.base import BaseSensorOperator
from airflow.triggers.file import FileTrigger

if TYPE_CHECKING:
    from airflow.utils.context import Context


[docs]class FileSensor(BaseSensorOperator): """ Waits for a file or folder to land in a filesystem. If the path given is a directory then this sensor will only return true if any files exist inside it (either directly, or within a subdirectory) :param fs_conn_id: reference to the File (path) connection id :param filepath: File or folder name (relative to the base path set within the connection), can be a glob. :param recursive: when set to ``True``, enables recursive directory matching behavior of ``**`` in glob filepath parameter. Defaults to ``False``. :param deferrable: If waiting for completion, whether to defer the task until done, default is ``False``. .. seealso:: For more information on how to use this sensor, take a look at the guide: :ref:`howto/operator:FileSensor` """
[docs] template_fields: Sequence[str] = ("filepath",)
[docs] ui_color = "#91818a"
def __init__( self, *, filepath, fs_conn_id="fs_default", recursive=False, deferrable: bool = conf.getboolean("operators", "default_deferrable", fallback=False), **kwargs, ): super().__init__(**kwargs) self.filepath = filepath self.fs_conn_id = fs_conn_id self.recursive = recursive self.deferrable = deferrable @cached_property
[docs] def path(self) -> str: hook = FSHook(self.fs_conn_id) basepath = hook.get_path() full_path = os.path.join(basepath, self.filepath) return full_path
[docs] def poke(self, context: Context) -> bool: self.log.info("Poking for file %s", self.path) for path in glob(self.path, recursive=self.recursive): if os.path.isfile(path): mod_time = datetime.datetime.fromtimestamp(os.path.getmtime(path)).strftime("%Y%m%d%H%M%S") self.log.info("Found File %s last modified: %s", path, mod_time) return True for _, _, files in os.walk(path): if files: return True return False
[docs] def execute(self, context: Context) -> None: if not self.deferrable: super().execute(context=context) if not self.poke(context=context): self.defer( timeout=datetime.timedelta(seconds=self.timeout), trigger=FileTrigger( filepath=self.path, recursive=self.recursive, poke_interval=self.poke_interval, ), method_name="execute_complete", )
[docs] def execute_complete(self, context: Context, event: bool | None = None) -> None: if not event: raise AirflowException("%s task failed as %s not found.", self.task_id, self.filepath) self.log.info("%s completed successfully as %s found.", self.task_id, self.filepath)

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