blob: 0ada995295837ba33ab2ab1281351c0b57f245dd [file] [log] [blame]
#!/usr/bin/python
import pickle, subprocess, os, shutil, socket, sys, time, signal, getpass
import datetime, traceback, tempfile, itertools, logging
import common
from autotest_lib.client.common_lib import utils, global_config, error
from autotest_lib.server import hosts, subcommand
from autotest_lib.scheduler import email_manager, scheduler_config
# An environment variable we add to the environment to enable us to
# distinguish processes we started from those that were started by
# something else during recovery. Name credit goes to showard. ;)
DARK_MARK_ENVIRONMENT_VAR = 'AUTOTEST_SCHEDULER_DARK_MARK'
_TEMPORARY_DIRECTORY = 'drone_tmp'
_TRANSFER_FAILED_FILE = '.transfer_failed'
class _MethodCall(object):
def __init__(self, method, args, kwargs):
self._method = method
self._args = args
self._kwargs = kwargs
def execute_on(self, drone_utility):
method = getattr(drone_utility, self._method)
return method(*self._args, **self._kwargs)
def __str__(self):
args = ', '.join(repr(arg) for arg in self._args)
kwargs = ', '.join('%s=%r' % (key, value) for key, value in
self._kwargs.iteritems())
full_args = ', '.join(item for item in (args, kwargs) if item)
return '%s(%s)' % (self._method, full_args)
def call(method, *args, **kwargs):
return _MethodCall(method, args, kwargs)
class DroneUtility(object):
"""
This class executes actual OS calls on the drone machine.
All paths going into and out of this class are absolute.
"""
_WARNING_DURATION = 60
def __init__(self):
# Tattoo ourselves so that all of our spawn bears our mark.
os.putenv(DARK_MARK_ENVIRONMENT_VAR, str(os.getpid()))
self.warnings = []
self._subcommands = []
def initialize(self, results_dir):
temporary_directory = os.path.join(results_dir, _TEMPORARY_DIRECTORY)
if os.path.exists(temporary_directory):
shutil.rmtree(temporary_directory)
self._ensure_directory_exists(temporary_directory)
def _warn(self, warning):
self.warnings.append(warning)
@staticmethod
def _check_pid_for_dark_mark(pid, open=open):
try:
env_file = open('/proc/%s/environ' % pid, 'rb')
except EnvironmentError:
return False
try:
env_data = env_file.read()
finally:
env_file.close()
return DARK_MARK_ENVIRONMENT_VAR in env_data
_PS_ARGS = ('pid', 'pgid', 'ppid', 'comm', 'args')
@classmethod
def _get_process_info(cls):
"""
@returns A generator of dicts with cls._PS_ARGS as keys and
string values each representing a running process.
"""
ps_proc = subprocess.Popen(
['/bin/ps', 'x', '-o', ','.join(cls._PS_ARGS)],
stdout=subprocess.PIPE)
ps_output = ps_proc.communicate()[0]
# split each line into the columns output by ps
split_lines = [line.split(None, 4) for line in ps_output.splitlines()]
return (dict(itertools.izip(cls._PS_ARGS, line_components))
for line_components in split_lines)
def _refresh_processes(self, command_name, open=open):
# The open argument is used for test injection.
check_mark = global_config.global_config.get_config_value(
'SCHEDULER', 'check_processes_for_dark_mark', bool, False)
processes = []
for info in self._get_process_info():
if info['comm'] == command_name:
if (check_mark and not
self._check_pid_for_dark_mark(info['pid'], open=open)):
self._warn('%(comm)s process pid %(pid)s has no '
'dark mark; ignoring.' % info)
continue
processes.append(info)
return processes
def _read_pidfiles(self, pidfile_paths):
pidfiles = {}
for pidfile_path in pidfile_paths:
if not os.path.exists(pidfile_path):
continue
try:
file_object = open(pidfile_path, 'r')
pidfiles[pidfile_path] = file_object.read()
file_object.close()
except IOError:
continue
return pidfiles
def refresh(self, pidfile_paths):
"""
pidfile_paths should be a list of paths to check for pidfiles.
Returns a dict containing:
* pidfiles: dict mapping pidfile paths to file contents, for pidfiles
that exist.
* autoserv_processes: list of dicts corresponding to running autoserv
processes. each dict contain pid, pgid, ppid, comm, and args (see
"man ps" for details).
* parse_processes: likewise, for parse processes.
* pidfiles_second_read: same info as pidfiles, but gathered after the
processes are scanned.
"""
results = {
'pidfiles' : self._read_pidfiles(pidfile_paths),
'autoserv_processes' : self._refresh_processes('autoserv'),
'parse_processes' : self._refresh_processes('parse'),
'pidfiles_second_read' : self._read_pidfiles(pidfile_paths),
}
return results
def kill_process(self, process):
signal_queue = (signal.SIGCONT, signal.SIGTERM, signal.SIGKILL)
utils.nuke_pid(process.pid, signal_queue=signal_queue)
def _convert_old_host_log(self, log_path):
"""
For backwards compatibility only. This can safely be removed in the
future.
The scheduler used to create files at results/hosts/<hostname>, and
append all host logs to that file. Now, it creates directories at
results/hosts/<hostname>, and places individual timestamped log files
into that directory.
This can be a problem the first time the scheduler runs after upgrading.
To work around that, we'll look for a file at the path where the
directory should be, and if we find one, we'll automatically convert it
to a directory containing the old logfile.
"""
# move the file out of the way
temp_dir = tempfile.mkdtemp(suffix='.convert_host_log')
base_name = os.path.basename(log_path)
temp_path = os.path.join(temp_dir, base_name)
os.rename(log_path, temp_path)
os.mkdir(log_path)
# and move it into the new directory
os.rename(temp_path, os.path.join(log_path, 'old_log'))
os.rmdir(temp_dir)
def _ensure_directory_exists(self, path):
if os.path.isdir(path):
return
if os.path.exists(path):
# path exists already, but as a file, not a directory
if '/hosts/' in path:
self._convert_old_host_log(path)
return
else:
raise IOError('Path %s exists as a file, not a directory')
os.makedirs(path)
def execute_command(self, command, working_directory, log_file,
pidfile_name):
out_file = None
if log_file:
self._ensure_directory_exists(os.path.dirname(log_file))
try:
out_file = open(log_file, 'a')
separator = ('*' * 80) + '\n'
out_file.write('\n' + separator)
out_file.write("%s> %s\n" % (time.strftime("%X %x"), command))
out_file.write(separator)
except (OSError, IOError):
email_manager.manager.log_stacktrace(
'Error opening log file %s' % log_file)
if not out_file:
out_file = open('/dev/null', 'w')
in_devnull = open('/dev/null', 'r')
self._ensure_directory_exists(working_directory)
pidfile_path = os.path.join(working_directory, pidfile_name)
if os.path.exists(pidfile_path):
self._warn('Pidfile %s already exists' % pidfile_path)
os.remove(pidfile_path)
subprocess.Popen(command, stdout=out_file, stderr=subprocess.STDOUT,
stdin=in_devnull)
out_file.close()
in_devnull.close()
def write_to_file(self, file_path, contents):
self._ensure_directory_exists(os.path.dirname(file_path))
try:
file_object = open(file_path, 'a')
file_object.write(contents)
file_object.close()
except IOError, exc:
self._warn('Error write to file %s: %s' % (file_path, exc))
def copy_file_or_directory(self, source_path, destination_path):
"""
This interface is designed to match server.hosts.abstract_ssh.get_file
(and send_file). That is, if the source_path ends with a slash, the
contents of the directory are copied; otherwise, the directory iself is
copied.
"""
if self._same_file(source_path, destination_path):
return
self._ensure_directory_exists(os.path.dirname(destination_path))
if source_path.endswith('/'):
# copying a directory's contents to another directory
assert os.path.isdir(source_path)
assert os.path.isdir(destination_path)
for filename in os.listdir(source_path):
self.copy_file_or_directory(
os.path.join(source_path, filename),
os.path.join(destination_path, filename))
elif os.path.isdir(source_path):
shutil.copytree(source_path, destination_path, symlinks=True)
elif os.path.islink(source_path):
# copied from shutil.copytree()
link_to = os.readlink(source_path)
os.symlink(link_to, destination_path)
else:
shutil.copy(source_path, destination_path)
def _same_file(self, source_path, destination_path):
"""Checks if the source and destination are the same
Returns True if the destination is the same as the source, False
otherwise. Also returns False if the destination does not exist.
"""
if not os.path.exists(destination_path):
return False
return os.path.samefile(source_path, destination_path)
def wait_for_all_async_commands(self):
for subproc in self._subcommands:
subproc.fork_waitfor()
self._subcommands = []
def _poll_async_commands(self):
still_running = []
for subproc in self._subcommands:
if subproc.poll() is None:
still_running.append(subproc)
self._subcommands = still_running
def _wait_for_some_async_commands(self):
self._poll_async_commands()
max_processes = scheduler_config.config.max_transfer_processes
while len(self._subcommands) >= max_processes:
time.sleep(1)
self._poll_async_commands()
def run_async_command(self, function, args):
subproc = subcommand.subcommand(function, args)
self._subcommands.append(subproc)
subproc.fork_start()
def _sync_get_file_from(self, hostname, source_path, destination_path):
self._ensure_directory_exists(os.path.dirname(destination_path))
host = create_host(hostname)
host.get_file(source_path, destination_path, delete_dest=True)
def get_file_from(self, hostname, source_path, destination_path):
self.run_async_command(self._sync_get_file_from,
(hostname, source_path, destination_path))
def sync_send_file_to(self, hostname, source_path, destination_path,
can_fail):
host = create_host(hostname)
try:
host.run('mkdir -p ' + os.path.dirname(destination_path))
host.send_file(source_path, destination_path, delete_dest=True)
except error.AutoservError:
if not can_fail:
raise
if os.path.isdir(source_path):
failed_file = os.path.join(source_path, _TRANSFER_FAILED_FILE)
file_object = open(failed_file, 'w')
try:
file_object.write('%s:%s\n%s\n%s' %
(hostname, destination_path,
datetime.datetime.now(),
traceback.format_exc()))
finally:
file_object.close()
else:
copy_to = destination_path + _TRANSFER_FAILED_FILE
self._ensure_directory_exists(os.path.dirname(copy_to))
self.copy_file_or_directory(source_path, copy_to)
def send_file_to(self, hostname, source_path, destination_path,
can_fail=False):
self.run_async_command(self.sync_send_file_to,
(hostname, source_path, destination_path,
can_fail))
def _report_long_execution(self, calls, duration):
call_count = {}
for call in calls:
call_count.setdefault(call._method, 0)
call_count[call._method] += 1
call_summary = '\n'.join('%d %s' % (count, method)
for method, count in call_count.iteritems())
self._warn('Execution took %f sec\n%s' % (duration, call_summary))
def execute_calls(self, calls):
results = []
start_time = time.time()
max_processes = scheduler_config.config.max_transfer_processes
for method_call in calls:
results.append(method_call.execute_on(self))
if len(self._subcommands) >= max_processes:
self._wait_for_some_async_commands()
self.wait_for_all_async_commands()
duration = time.time() - start_time
if duration > self._WARNING_DURATION:
self._report_long_execution(calls, duration)
warnings = self.warnings
self.warnings = []
return dict(results=results, warnings=warnings)
def create_host(hostname):
username = global_config.global_config.get_config_value(
'SCHEDULER', hostname + '_username', default=getpass.getuser())
return hosts.SSHHost(hostname, user=username)
def parse_input():
input_chunks = []
chunk_of_input = sys.stdin.read()
while chunk_of_input:
input_chunks.append(chunk_of_input)
chunk_of_input = sys.stdin.read()
pickled_input = ''.join(input_chunks)
try:
return pickle.loads(pickled_input)
except Exception, exc:
separator = '*' * 50
raise ValueError('Unpickling input failed\n'
'Input: %r\n'
'Exception from pickle:\n'
'%s\n%s\n%s' %
(pickled_input, separator, traceback.format_exc(),
separator))
def return_data(data):
print pickle.dumps(data)
def main():
calls = parse_input()
drone_utility = DroneUtility()
return_value = drone_utility.execute_calls(calls)
return_data(return_value)
if __name__ == '__main__':
main()