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#
# Copyright (C) 2018 Codethink Limited
# Copyright (C) 2018-2019 Bloomberg Finance LP
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
#
import contextlib
import os
import shutil
import signal
import subprocess
import tempfile
import time
from .. import _signals, utils
from .._message import Message, MessageType
_CASD_MAX_LOGFILES = 10
# CASDProcessManager
#
# This manages the subprocess that runs buildbox-casd.
#
# Args:
# path (str): The root directory for the CAS repository
# log_dir (str): The directory for the logs
# log_level (LogLevel): Log level to give to buildbox-casd for logging
# cache_quota (int): User configured cache quota
# protect_session_blobs (bool): Disable expiry for blobs used in the current session
#
class CASDProcessManager:
def __init__(self, path, log_dir, log_level, cache_quota, protect_session_blobs):
self._log_dir = log_dir
# Place socket in global/user temporary directory to avoid hitting
# the socket path length limit.
self._socket_tempdir = tempfile.mkdtemp(prefix="buildstream")
self.socket_path = os.path.join(self._socket_tempdir, "casd.sock")
casd_args = [utils.get_host_tool("buildbox-casd")]
casd_args.append("--bind=unix:" + self.socket_path)
casd_args.append("--log-level=" + log_level.value)
if cache_quota is not None:
casd_args.append("--quota-high={}".format(int(cache_quota)))
casd_args.append("--quota-low={}".format(int(cache_quota / 2)))
if protect_session_blobs:
casd_args.append("--protect-session-blobs")
casd_args.append(path)
self.start_time = time.time()
self._logfile = self._rotate_and_get_next_logfile()
with open(self._logfile, "w") as logfile_fp:
# Block SIGINT on buildbox-casd, we don't need to stop it
# The frontend will take care of it if needed
with _signals.blocked([signal.SIGINT], ignore=False):
self.process = subprocess.Popen(casd_args, cwd=path, stdout=logfile_fp, stderr=subprocess.STDOUT)
# _rotate_and_get_next_logfile()
#
# Get the logfile to use for casd
#
# This will ensure that we don't create too many casd log files by
# rotating the logs and only keeping _CASD_MAX_LOGFILES logs around.
#
# Returns:
# (str): the path to the log file to use
#
def _rotate_and_get_next_logfile(self):
try:
existing_logs = sorted(os.listdir(self._log_dir))
except FileNotFoundError:
os.makedirs(self._log_dir)
else:
while len(existing_logs) >= _CASD_MAX_LOGFILES:
logfile_to_delete = existing_logs.pop(0)
os.remove(os.path.join(self._log_dir, logfile_to_delete))
return os.path.join(self._log_dir, str(self.start_time) + ".log")
# terminate()
#
# Terminate the buildbox casd process
#
# Args:
# messenger (buildstream._messenger.Messenger): Messenger to forward information to the frontend
#
def terminate(self, messenger=None):
return_code = self.process.poll()
if return_code is not None:
# buildbox-casd is already dead
self.process = None
if messenger:
messenger.message(
Message(
MessageType.BUG,
"Buildbox-casd died during the run. Exit code: {}, Logs: {}".format(
return_code, self._logfile
),
)
)
return
self.process.terminate()
try:
# Don't print anything if buildbox-casd terminates quickly
return_code = self.process.wait(timeout=0.5)
except subprocess.TimeoutExpired:
if messenger:
cm = messenger.timed_activity("Terminating buildbox-casd")
else:
cm = contextlib.suppress()
with cm:
try:
return_code = self.process.wait(timeout=15)
except subprocess.TimeoutExpired:
self.process.kill()
self.process.wait(timeout=15)
if messenger:
messenger.message(
Message(MessageType.WARN, "Buildbox-casd didn't exit in time and has been killed")
)
self.process = None
return
if return_code != 0 and messenger:
messenger.message(
Message(
MessageType.BUG,
"Buildbox-casd didn't exit cleanly. Exit code: {}, Logs: {}".format(return_code, self._logfile),
)
)
# clean_up()
#
# After termination, clean up any additional resources
#
def clean_up(self):
shutil.rmtree(self._socket_tempdir)
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