Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.8/site-packages/airflow/hooks/subprocess.py: 0%

1# Licensed to the Apache Software Foundation (ASF) under one 

2# or more contributor license agreements. See the NOTICE file 

3# distributed with this work for additional information 

4# regarding copyright ownership. The ASF licenses this file 

5# to you under the Apache License, Version 2.0 (the 

6# "License"); you may not use this file except in compliance 

7# with the License. You may obtain a copy of the License at 

8# 

9# http://www.apache.org/licenses/LICENSE-2.0 

10# 

11# Unless required by applicable law or agreed to in writing, 

12# software distributed under the License is distributed on an 

13# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 

14# KIND, either express or implied. See the License for the 

15# specific language governing permissions and limitations 

16# under the License. 

17from __future__ import annotations 

18 

19import contextlib 

20import os 

21import signal 

22from collections import namedtuple 

23from subprocess import PIPE, STDOUT, Popen 

24from tempfile import TemporaryDirectory, gettempdir 

25 

26from airflow.hooks.base import BaseHook 

27 

28SubprocessResult = namedtuple("SubprocessResult", ["exit_code", "output"]) 

29 

30 

31class SubprocessHook(BaseHook): 

32 """Hook for running processes with the ``subprocess`` module.""" 

33 

34 def __init__(self) -> None: 

35 self.sub_process: Popen[bytes] | None = None 

36 super().__init__() 

37 

38 def run_command( 

39 self, 

40 command: list[str], 

41 env: dict[str, str] | None = None, 

42 output_encoding: str = "utf-8", 

43 cwd: str | None = None, 

44 ) -> SubprocessResult: 

45 """ 

46 Execute the command. 

47 

48 If ``cwd`` is None, execute the command in a temporary directory which will be cleaned afterwards. 

49 If ``env`` is not supplied, ``os.environ`` is passed 

50 

51 :param command: the command to run 

52 :param env: Optional dict containing environment variables to be made available to the shell 

53 environment in which ``command`` will be executed. If omitted, ``os.environ`` will be used. 

54 Note, that in case you have Sentry configured, original variables from the environment 

55 will also be passed to the subprocess with ``SUBPROCESS_`` prefix. See 

56 :doc:`/administration-and-deployment/logging-monitoring/errors` for details. 

57 :param output_encoding: encoding to use for decoding stdout 

58 :param cwd: Working directory to run the command in. 

59 If None (default), the command is run in a temporary directory. 

60 :return: :class:`namedtuple` containing ``exit_code`` and ``output``, the last line from stderr 

61 or stdout 

62 """ 

63 self.log.info("Tmp dir root location: %s", gettempdir()) 

64 with contextlib.ExitStack() as stack: 

65 if cwd is None: 

66 cwd = stack.enter_context(TemporaryDirectory(prefix="airflowtmp")) 

67 

68 def pre_exec(): 

69 # Restore default signal disposition and invoke setsid 

70 for sig in ("SIGPIPE", "SIGXFZ", "SIGXFSZ"): 

71 if hasattr(signal, sig): 

72 signal.signal(getattr(signal, sig), signal.SIG_DFL) 

73 os.setsid() 

74 

75 self.log.info("Running command: %s", command) 

76 

77 self.sub_process = Popen( 

78 command, 

79 stdout=PIPE, 

80 stderr=STDOUT, 

81 cwd=cwd, 

82 env=env if env or env == {} else os.environ, 

83 preexec_fn=pre_exec, 

84 ) 

85 

86 self.log.info("Output:") 

87 line = "" 

88 if self.sub_process is None: 

89 raise RuntimeError("The subprocess should be created here and is None!") 

90 if self.sub_process.stdout is not None: 

91 for raw_line in iter(self.sub_process.stdout.readline, b""): 

92 line = raw_line.decode(output_encoding, errors="backslashreplace").rstrip() 

93 self.log.info("%s", line) 

94 

95 self.sub_process.wait() 

96 

97 self.log.info("Command exited with return code %s", self.sub_process.returncode) 

98 return_code: int = self.sub_process.returncode 

99 

100 return SubprocessResult(exit_code=return_code, output=line) 

101 

102 def send_sigterm(self): 

103 """Sends SIGTERM signal to ``self.sub_process`` if one exists.""" 

104 self.log.info("Sending SIGTERM signal to process group") 

105 if self.sub_process and hasattr(self.sub_process, "pid"): 

106 os.killpg(os.getpgid(self.sub_process.pid), signal.SIGTERM)