Source code for airflow.sensors.bash

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from __future__ import annotations

import os
from subprocess import PIPE, STDOUT, Popen
from tempfile import NamedTemporaryFile, TemporaryDirectory, gettempdir
from typing import Sequence

from airflow.sensors.base import BaseSensorOperator
from airflow.utils.context import Context

[docs]class BashSensor(BaseSensorOperator): """ Executes a bash command/script. Return True if and only if the return code is 0. :param bash_command: The command, set of commands or reference to a bash script (must be '.sh') to be executed. :param env: If env is not None, it must be a mapping that defines the environment variables for the new process; these are used instead of inheriting the current process environment, which is the default behavior. (templated) :param output_encoding: output encoding of bash command. .. seealso:: For more information on how to use this sensor,take a look at the guide: :ref:`howto/operator:BashSensor` """
[docs] template_fields: Sequence[str] = ("bash_command", "env")
def __init__(self, *, bash_command, env=None, output_encoding="utf-8", **kwargs): super().__init__(**kwargs) self.bash_command = bash_command self.env = env self.output_encoding = output_encoding
[docs] def poke(self, context: Context): """Execute the bash command in a temporary directory.""" bash_command = self.bash_command"Tmp dir root location: \n %s", gettempdir()) with TemporaryDirectory(prefix="airflowtmp") as tmp_dir: with NamedTemporaryFile(dir=tmp_dir, prefix=self.task_id) as f: f.write(bytes(bash_command, "utf_8")) f.flush() fname = script_location = tmp_dir + "/" + fname"Temporary script location: %s", script_location)"Running command: %s", bash_command) with Popen( ["bash", fname], stdout=PIPE, stderr=STDOUT, close_fds=True, cwd=tmp_dir, env=self.env, preexec_fn=os.setsid, ) as resp: if resp.stdout:"Output:") for line in iter(resp.stdout.readline, b""): resp.wait()"Command exited with return code %s", resp.returncode) return not resp.returncode

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