Source code for airflow.sensors.filesystem

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import os
from glob import glob

from airflow.hooks.filesystem import FSHook
from airflow.sensors.base import BaseSensorOperator
from airflow.utils.decorators import apply_defaults


[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
    :type fs_conn_id: str
    :param filepath: File or folder name (relative to
        the base path set within the connection), can be a glob.
    :type filepath: str
    """

[docs]    template_fields = ('filepath',)
[docs]    ui_color = '#91818a'

    @apply_defaults
    def __init__(self, *, filepath, fs_conn_id='fs_default', **kwargs):
        super().__init__(**kwargs)
        self.filepath = filepath
        self.fs_conn_id = fs_conn_id

[docs]    def poke(self, context):
        hook = FSHook(self.fs_conn_id)
        basepath = hook.get_path()
        full_path = os.path.join(basepath, self.filepath)
        self.log.info('Poking for file %s', full_path)

        for path in glob(full_path):
            if os.path.isfile(path):
                return True

            for _, _, files in os.walk(full_path):
                if len(files) > 0:
                    return True
        return False