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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
import grpc
from .._protos.build.bazel.remote.execution.v2 import remote_execution_pb2_grpc
from .._protos.build.buildgrid import local_cas_pb2_grpc
from .. import _signals, utils
from .._exceptions import CASCacheError
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")
self._connection_string = "unix:" + self._socket_path
casd_args = [utils.get_host_tool("buildbox-casd")]
casd_args.append("--bind=" + self._connection_string)
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")
# release_resources()
#
# Terminate the process and release related resources.
#
def release_resources(self, messenger=None):
self._terminate(messenger)
self.process = None
shutil.rmtree(self._socket_tempdir)
# _terminate()
#
# Terminate the buildbox casd process.
#
def _terminate(self, messenger=None):
return_code = self.process.poll()
if return_code is not None:
# buildbox-casd is already dead
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")
)
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),
)
)
# create_channel():
#
# Return a CASDChannel, note that the actual connection is not necessarily
# established until it is needed.
#
def create_channel(self):
return CASDChannel(self._socket_path, self._connection_string, self._start_time)
class CASDChannel:
def __init__(self, socket_path, connection_string, start_time):
self._socket_path = socket_path
self._connection_string = connection_string
self._start_time = start_time
self._casd_channel = None
self._casd_cas = None
self._local_cas = None
def _establish_connection(self):
assert self._casd_channel is None
while not os.path.exists(self._socket_path):
# casd is not ready yet, try again after a 10ms delay,
# but don't wait for more than 15s
if time.time() > self._start_time + 15:
raise CASCacheError("Timed out waiting for buildbox-casd to become ready")
time.sleep(0.01)
self._casd_channel = grpc.insecure_channel(self._connection_string)
self._casd_cas = remote_execution_pb2_grpc.ContentAddressableStorageStub(self._casd_channel)
self._local_cas = local_cas_pb2_grpc.LocalContentAddressableStorageStub(self._casd_channel)
# get_cas():
#
# Return ContentAddressableStorage stub for buildbox-casd channel.
#
def get_cas(self):
if self._casd_channel is None:
self._establish_connection()
return self._casd_cas
# get_local_cas():
#
# Return LocalCAS stub for buildbox-casd channel.
#
def get_local_cas(self):
if self._casd_channel is None:
self._establish_connection()
return self._local_cas
# is_closed():
#
# Return whether this connection is closed or not.
#
def is_closed(self):
return self._casd_channel is None
# close():
#
# Close the casd channel.
#
def close(self):
if self.is_closed():
return
self._local_cas = None
self._casd_cas = None
self._casd_channel.close()
self._casd_channel = None
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