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#!/usr/bin/python2
"""The binary search wrapper."""
from __future__ import print_function
import argparse
import math
import os
import pickle
import sys
import tempfile
# Programtically adding utils python path to PYTHONPATH
if os.path.isabs(sys.argv[0]):
utils_pythonpath = os.path.abspath('{0}/..'.format(os.path.dirname(sys.argv[
0])))
else:
wdir = os.getcwd()
utils_pythonpath = os.path.abspath('{0}/{1}/..'.format(wdir, os.path.dirname(
sys.argv[0])))
sys.path.append(utils_pythonpath)
# Now we do import from utils
from utils import command_executer
from utils import logger
import binary_search_perforce
STATE_FILE = '%s.state' % sys.argv[0]
HIDDEN_STATE_FILE = os.path.join(
os.path.dirname(STATE_FILE), '.%s' % os.path.basename(STATE_FILE))
class BinarySearchState(object):
"""The binary search state class."""
def __init__(self, get_initial_items, switch_to_good, switch_to_bad,
install_script, test_script, incremental, prune, iterations,
prune_iterations, verify_level, file_args, verbose):
self.get_initial_items = get_initial_items
self.switch_to_good = switch_to_good
self.switch_to_bad = switch_to_bad
self.install_script = install_script
self.test_script = test_script
self.incremental = incremental
self.prune = prune
self.iterations = iterations
self.prune_iterations = prune_iterations
self.verify_level = verify_level
self.file_args = file_args
self.verbose = verbose
self.l = logger.GetLogger()
self.ce = command_executer.GetCommandExecuter()
self.prune_cycles = 0
self.search_cycles = 0
self.bs = None
self.all_items = None
self.PopulateItemsUsingCommand(self.get_initial_items)
self.currently_good_items = set([])
self.currently_bad_items = set([])
self.found_items = set([])
def SwitchToGood(self, item_list):
if self.incremental:
self.l.LogOutput('Incremental set. Wanted to switch %s to good' %
str(item_list), print_to_console=self.verbose)
incremental_items = [
item for item in item_list if item not in self.currently_good_items
]
item_list = incremental_items
self.l.LogOutput('Incremental set. Actually switching %s to good' %
str(item_list), print_to_console=self.verbose)
if not item_list:
return
self.l.LogOutput('Switching %s to good' % str(item_list),
print_to_console=self.verbose)
self.RunSwitchScript(self.switch_to_good, item_list)
self.currently_good_items = self.currently_good_items.union(set(item_list))
self.currently_bad_items.difference_update(set(item_list))
def SwitchToBad(self, item_list):
if self.incremental:
self.l.LogOutput('Incremental set. Wanted to switch %s to bad' %
str(item_list), print_to_console=self.verbose)
incremental_items = [
item for item in item_list if item not in self.currently_bad_items
]
item_list = incremental_items
self.l.LogOutput('Incremental set. Actually switching %s to bad' %
str(item_list), print_to_console=self.verbose)
if not item_list:
return
self.l.LogOutput('Switching %s to bad' % str(item_list),
print_to_console=self.verbose)
self.RunSwitchScript(self.switch_to_bad, item_list)
self.currently_bad_items = self.currently_bad_items.union(set(item_list))
self.currently_good_items.difference_update(set(item_list))
def RunSwitchScript(self, switch_script, item_list):
if self.file_args:
temp_file = tempfile.mktemp()
f = open(temp_file, 'wb')
f.write('\n'.join(item_list))
f.close()
command = '%s %s' % (switch_script, temp_file)
else:
command = '%s %s' % (switch_script, ' '.join(item_list))
ret, _, _ = self.ce.RunCommandWExceptionCleanup(
command, print_to_console=self.verbose)
assert ret == 0, 'Switch script %s returned %d' % (switch_script, ret)
def TestScript(self):
command = self.test_script
ret, _, _ = self.ce.RunCommandWExceptionCleanup(command)
return ret
def InstallScript(self):
if not self.install_script:
return 0
command = self.install_script
ret, _, _ = self.ce.RunCommandWExceptionCleanup(command)
return ret
def DoVerify(self):
self.l.LogOutput('VERIFICATION')
self.l.LogOutput('Beginning %d tests to verify good/bad sets\n')
for _ in range(int(self.verify_level)):
self.l.LogOutput('Resetting all items to good to verify.')
self.SwitchToGood(self.all_items)
status = self.InstallScript()
assert status == 0, 'When reset_to_good, install should succeed.'
status = self.TestScript()
assert status == 0, 'When reset_to_good, status should be 0.'
self.l.LogOutput('Resetting all items to bad to verify.')
self.SwitchToBad(self.all_items)
status = self.InstallScript()
assert status == 0, 'When reset_to_bad, install should succeed.'
status = self.TestScript()
assert status == 1, 'When reset_to_bad, status should be 1.'
def DoSearch(self):
num_bad_items_history = []
self.prune_cycles = 0
while (True and
len(self.all_items) > 1 and
self.prune_cycles < self.prune_iterations):
self.prune_cycles += 1
terminated = self.DoBinarySearch()
if not terminated:
break
if not self.prune:
self.l.LogOutput('Not continuning further, --prune is not set')
break
# Prune is set.
prune_index = self.bs.current
if prune_index == len(self.all_items) - 1:
self.l.LogOutput('First bad item is the last item. Breaking.')
self.l.LogOutput('Bad items are: %s' % self.all_items[-1])
break
num_bad_items = len(self.all_items) - prune_index
num_bad_items_history.append(num_bad_items)
if (num_bad_items_history[-num_bad_items:] ==
[num_bad_items for _ in range(num_bad_items)]):
self.l.LogOutput('num_bad_items_history: %s for past %d iterations. '
'Breaking.' % (str(num_bad_items_history),
num_bad_items))
self.l.LogOutput('Bad items are: %s' %
' '.join(self.all_items[prune_index:]))
break
new_all_items = list(self.all_items)
# Move prune item to the end of the list.
new_all_items.append(new_all_items.pop(prune_index))
self.found_items.add(new_all_items[-1])
if prune_index:
new_all_items = new_all_items[prune_index - 1:]
self.l.LogOutput('Old list: %s. New list: %s' % (str(self.all_items),
str(new_all_items)),
print_to_console=self.verbose)
# FIXME: Do we need to Convert the currently good items to bad
self.PopulateItemsUsingList(new_all_items)
def DoBinarySearch(self):
self.search_cycles = 0
terminated = False
while self.search_cycles < self.iterations and not terminated:
self.OutputProgress()
self.search_cycles += 1
[bad_items, good_items] = self.GetNextItems()
# TODO: bad_items should come first.
self.SwitchToGood(good_items)
self.SwitchToBad(bad_items)
status = self.InstallScript()
if status == 0:
status = self.TestScript()
else:
# Install script failed, treat as skipped item
status = 2
terminated = self.bs.SetStatus(status)
if terminated:
self.l.LogOutput('Terminated!')
if not terminated:
self.l.LogOutput('Ran out of iterations searching...')
self.l.LogOutput(str(self), print_to_console=self.verbose)
return terminated
def PopulateItemsUsingCommand(self, command):
ce = command_executer.GetCommandExecuter()
_, out, _ = ce.RunCommandWExceptionCleanup(command,
return_output=True,
print_to_console=self.verbose)
all_items = out.split()
self.PopulateItemsUsingList(all_items)
def PopulateItemsUsingList(self, all_items):
self.all_items = all_items
self.bs = binary_search_perforce.BinarySearcher(logger_to_set=self.l)
self.bs.SetSortedList(self.all_items)
def SaveState(self):
ce, l, bs = self.ce, self.l, self.bs
self.ce, self.l, self.bs = None, None, None
old_state = None
_, path = tempfile.mkstemp(prefix=HIDDEN_STATE_FILE, dir='.')
with open(path, 'wb') as f:
pickle.dump(self, f)
if os.path.exists(STATE_FILE):
if os.path.islink(STATE_FILE):
old_state = os.readlink(STATE_FILE)
else:
l.LogError(('%s already exists and is not a symlink!\n'
'State file saved to %s' % (STATE_FILE, path)))
sys.exit(1)
# Create new link and atomically overwrite old link
temp_link = '%s.link' % HIDDEN_STATE_FILE
os.symlink(path, temp_link)
os.rename(temp_link, STATE_FILE)
if old_state:
os.remove(old_state)
self.ce, self.l, self.bs = ce, l, bs
@classmethod
def LoadState(cls):
if not os.path.isfile(STATE_FILE):
return None
return pickle.load(file(STATE_FILE))
def GetNextItems(self):
border_item = self.bs.GetNext()
index = self.all_items.index(border_item)
next_bad_items = self.all_items[:index + 1]
next_good_items = self.all_items[index + 1:]
return [next_bad_items, next_good_items]
def OutputProgress(self):
out = ('\n********** PROGRESS **********\n'
'Search %d of estimated %d.\n'
'Prune %d of max %d.\n'
'Current bad items found:\n'
'%s\n'
'******************************')
out = out % (self.search_cycles + 1,
math.ceil(math.log(len(self.all_items), 2)),
self.prune_cycles,
self.prune_iterations,
str(self.found_items))
self.l.LogOutput(out)
def __str__(self):
ret = ''
ret += 'all: %s\n' % str(self.all_items)
ret += 'currently_good: %s\n' % str(self.currently_good_items)
ret += 'currently_bad: %s\n' % str(self.currently_bad_items)
ret += str(self.bs)
return ret
class MockBinarySearchState(BinarySearchState):
"""Mock class for BinarySearchState."""
def __init__(self):
# Initialize all arguments to None
kwargs = {
'get_initial_items': 'echo "1"',
'switch_to_good': None,
'switch_to_bad': None,
'install_script': None,
'test_script': None,
'incremental': None,
'prune': None,
'iterations': None,
'prune_iterations': None,
'verify_level': None,
'file_args': None,
'verbose': None
}
super(MockBinarySearchState, self).__init__(**kwargs)
def _CanonicalizeScript(script_name):
script_name = os.path.expanduser(script_name)
if not script_name.startswith('/'):
return os.path.join('.', script_name)
def Main(argv):
"""The main function."""
# Common initializations
parser = argparse.ArgumentParser()
parser.add_argument('-n',
'--iterations',
dest='iterations',
help='Number of iterations to try in the search.',
default=50)
parser.add_argument('-i',
'--get_initial_items',
dest='get_initial_items',
help=('Script to run to get the initial objects. '
'If your script requires user input '
'the --verbose option must be used'))
parser.add_argument('-g',
'--switch_to_good',
dest='switch_to_good',
help=('Script to run to switch to good. '
'If your switch script requires user input '
'the --verbose option must be used'))
parser.add_argument('-b',
'--switch_to_bad',
dest='switch_to_bad',
help=('Script to run to switch to bad. '
'If your switch script requires user input '
'the --verbose option must be used'))
parser.add_argument('-I',
'--install_script',
dest='install_script',
default=None,
help=('Optional script to perform building, flashing, '
'and other setup before the test script runs.'))
parser.add_argument('-t',
'--test_script',
dest='test_script',
help=('Script to run to test the '
'output after packages are built.'))
parser.add_argument('-p',
'--prune',
dest='prune',
action='store_true',
default=False,
help=('Script to run to test the output after '
'packages are built.'))
parser.add_argument('-c',
'--noincremental',
dest='noincremental',
action='store_true',
default=False,
help='Do not propagate good/bad changes incrementally.')
parser.add_argument('-f',
'--file_args',
dest='file_args',
action='store_true',
default=False,
help='Use a file to pass arguments to scripts.')
parser.add_argument('-v',
'--verify_level',
dest='verify_level',
default=1,
help=('Check binary search assumptions N times '
'before starting.'))
parser.add_argument('-N',
'--prune_iterations',
dest='prune_iterations',
help='Number of prune iterations to try in the search.',
default=100)
parser.add_argument('-V',
'--verbose',
dest='verbose',
action='store_true',
help='Print full output to console.')
logger.GetLogger().LogOutput(' '.join(argv))
options = parser.parse_args(argv)
if not (options.get_initial_items and options.switch_to_good and
options.switch_to_bad and options.test_script):
parser.print_help()
return 1
iterations = int(options.iterations)
switch_to_good = _CanonicalizeScript(options.switch_to_good)
switch_to_bad = _CanonicalizeScript(options.switch_to_bad)
install_script = options.install_script
if install_script:
install_script = _CanonicalizeScript(options.install_script)
test_script = _CanonicalizeScript(options.test_script)
get_initial_items = _CanonicalizeScript(options.get_initial_items)
prune = options.prune
prune_iterations = options.prune_iterations
verify_level = options.verify_level
file_args = options.file_args
verbose = options.verbose
binary_search_perforce.verbose = verbose
if options.noincremental:
incremental = False
else:
incremental = True
try:
bss = BinarySearchState(get_initial_items, switch_to_good, switch_to_bad,
install_script, test_script, incremental, prune,
iterations, prune_iterations, verify_level,
file_args, verbose)
bss.DoVerify()
bss.DoSearch()
except (KeyboardInterrupt, SystemExit):
print('C-c pressed')
bss.SaveState()
return 0
if __name__ == '__main__':
sys.exit(Main(sys.argv[1:]))
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