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#!/usr/bin/python2
#
# Copyright 2011 Google Inc. All Rights Reserved.
#
__author__ = 'kbaclawski@google.com (Krystian Baclawski)'
import cStringIO
import logging
import os
import signal
import socket
import sys
import time
import unittest
def AddScriptDirToPath():
"""Required for remote python script execution."""
path = os.path.abspath(__file__)
for _ in range(3):
path, _ = os.path.split(path)
if not path in sys.path:
sys.path.append(path)
AddScriptDirToPath()
from automation.common.command_executer import CommandExecuter
class LoggerMock(object):
def LogCmd(self, cmd, machine='', user=''):
if machine:
logging.info('[%s] Executing: %s', machine, cmd)
else:
logging.info('Executing: %s', cmd)
def LogError(self, msg):
logging.error(msg)
def LogWarning(self, msg):
logging.warning(msg)
def LogOutput(self, msg):
logging.info(msg)
class CommandExecuterUnderTest(CommandExecuter):
def __init__(self):
CommandExecuter.__init__(self, logger_to_set=LoggerMock())
# We will record stdout and stderr.
self._stderr = cStringIO.StringIO()
self._stdout = cStringIO.StringIO()
@property
def stdout(self):
return self._stdout.getvalue()
@property
def stderr(self):
return self._stderr.getvalue()
def DataReceivedOnOutput(self, data):
self._stdout.write(data)
def DataReceivedOnError(self, data):
self._stderr.write(data)
class CommandExecuterLocalTests(unittest.TestCase):
HOSTNAME = None
def setUp(self):
self._executer = CommandExecuterUnderTest()
def tearDown(self):
pass
def RunCommand(self, method, **kwargs):
program = os.path.abspath(sys.argv[0])
return self._executer.RunCommand('%s runHelper %s' % (program, method),
machine=self.HOSTNAME,
**kwargs)
def testCommandTimeout(self):
exit_code = self.RunCommand('SleepForMinute', command_timeout=3)
self.assertTrue(-exit_code in [signal.SIGTERM, signal.SIGKILL],
'Invalid exit code: %d' % exit_code)
def testCommandTimeoutIfSigTermIgnored(self):
exit_code = self.RunCommand('IgnoreSigTerm', command_timeout=3)
self.assertTrue(-exit_code in [signal.SIGTERM, signal.SIGKILL])
def testCommandSucceeded(self):
self.assertFalse(self.RunCommand('ReturnTrue'))
def testCommandFailed(self):
self.assertTrue(self.RunCommand('ReturnFalse'))
def testStringOnOutputStream(self):
self.assertFalse(self.RunCommand('EchoToOutputStream'))
self.assertEquals(self._executer.stderr, '')
self.assertEquals(self._executer.stdout, 'test')
def testStringOnErrorStream(self):
self.assertFalse(self.RunCommand('EchoToErrorStream'))
self.assertEquals(self._executer.stderr, 'test')
self.assertEquals(self._executer.stdout, '')
def testOutputStreamNonInteractive(self):
self.assertFalse(
self.RunCommand('IsOutputStreamInteractive'),
'stdout stream is a terminal!')
def testErrorStreamNonInteractive(self):
self.assertFalse(
self.RunCommand('IsErrorStreamInteractive'),
'stderr stream is a terminal!')
def testAttemptToRead(self):
self.assertFalse(self.RunCommand('WaitForInput', command_timeout=3))
def testInterruptedProcess(self):
self.assertEquals(self.RunCommand('TerminateBySigAbrt'), -signal.SIGABRT)
class CommandExecuterRemoteTests(CommandExecuterLocalTests):
HOSTNAME = socket.gethostname()
def testCommandTimeoutIfSigTermIgnored(self):
exit_code = self.RunCommand('IgnoreSigTerm', command_timeout=6)
self.assertEquals(exit_code, 255)
lines = self._executer.stdout.splitlines()
pid = int(lines[0])
try:
with open('/proc/%d/cmdline' % pid) as f:
cmdline = f.read()
except IOError:
cmdline = ''
self.assertFalse('IgnoreSigTerm' in cmdline, 'Process is still alive.')
class CommandExecuterTestHelpers(object):
def SleepForMinute(self):
time.sleep(60)
return 1
def ReturnTrue(self):
return 0
def ReturnFalse(self):
return 1
def EchoToOutputStream(self):
sys.stdout.write('test')
return 0
def EchoToErrorStream(self):
sys.stderr.write('test')
return 0
def IsOutputStreamInteractive(self):
return sys.stdout.isatty()
def IsErrorStreamInteractive(self):
return sys.stderr.isatty()
def IgnoreSigTerm(self):
os.write(1, '%d' % os.getpid())
signal.signal(signal.SIGTERM, signal.SIG_IGN)
time.sleep(30)
return 0
def WaitForInput(self):
try:
# can only read end-of-file marker
return os.read(0, 1) != ''
except OSError:
# that means that stdin descriptor is closed
return 0
def TerminateBySigAbrt(self):
os.kill(os.getpid(), signal.SIGABRT)
return 0
if __name__ == '__main__':
FORMAT = '%(asctime)-15s %(levelname)s %(message)s'
logging.basicConfig(format=FORMAT, level=logging.DEBUG)
if len(sys.argv) > 1:
if sys.argv[1] == 'runHelper':
helpers = CommandExecuterTestHelpers()
sys.exit(getattr(helpers, sys.argv[2])())
unittest.main()
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