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Diffstat (limited to 'gluster/swift/common/Glusterfs.py')
| -rw-r--r-- | gluster/swift/common/Glusterfs.py | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/gluster/swift/common/Glusterfs.py b/gluster/swift/common/Glusterfs.py new file mode 100644 index 0000000..a0c8126 --- /dev/null +++ b/gluster/swift/common/Glusterfs.py @@ -0,0 +1,144 @@ +# Copyright (c) 2012 Red Hat, Inc. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or +# implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +import logging +import os, sys, fcntl, time, errno +from ConfigParser import ConfigParser, NoSectionError, NoOptionError +from swift.common.utils import TRUE_VALUES, search_tree +from gluster.swift.common.fs_utils import mkdirs + +# +# Read the fs.conf file once at startup (module load) +# +_fs_conf = ConfigParser() +MOUNT_IP = 'localhost' +OBJECT_ONLY = False +RUN_DIR='/var/run/swift' +SWIFT_DIR = '/etc/swift' +_do_getsize = False +if _fs_conf.read(os.path.join('/etc/swift', 'fs.conf')): + try: + MOUNT_IP = _fs_conf.get('DEFAULT', 'mount_ip', 'localhost') + except (NoSectionError, NoOptionError): + pass + try: + OBJECT_ONLY = _fs_conf.get('DEFAULT', 'object_only', "no") in TRUE_VALUES + except (NoSectionError, NoOptionError): + pass + try: + RUN_DIR = _fs_conf.get('DEFAULT', 'run_dir', '/var/run/swift') + except (NoSectionError, NoOptionError): + pass + + try: + _do_getsize = _fs_conf.get('DEFAULT', 'accurate_size_in_listing', \ + "no") in TRUE_VALUES + except (NoSectionError, NoOptionError): + pass + +NAME = 'glusterfs' + + +def _busy_wait(full_mount_path): + # Iterate for definite number of time over a given + # interval for successful mount + for i in range(0, 5): + if os.path.ismount(os.path.join(full_mount_path)): + return True + time.sleep(2) + logging.error('Busy wait for mount timed out for mount %s', full_mount_path) + return False + +def mount(root, drive): + # FIXME: Possible thundering herd problem here + + el = _get_export_list() + for export in el: + if drive == export: + break + else: + logging.error('No export found in %r matching drive, %s', el, drive) + return False + + # NOTE: root is typically the default value of /mnt/gluster-object + full_mount_path = os.path.join(root, drive) + if not os.path.isdir(full_mount_path): + mkdirs(full_mount_path) + + lck_file = os.path.join(RUN_DIR, '%s.lock' %drive); + + if not os.path.exists(RUN_DIR): + mkdirs(RUN_DIR) + + fd = os.open(lck_file, os.O_CREAT|os.O_RDWR) + with os.fdopen(fd, 'r+b') as f: + try: + fcntl.lockf(f, fcntl.LOCK_EX|fcntl.LOCK_NB) + except IOError as ex: + if ex.errno in (errno.EACCES, errno.EAGAIN): + # This means that some other process is mounting the + # filesystem, so wait for the mount process to complete + return _busy_wait(full_mount_path) + else: + raise ex + mnt_cmd = 'mount -t glusterfs %s:%s %s' % (MOUNT_IP, export, \ + full_mount_path) + if os.system(mnt_cmd) or not _busy_wait(full_mount_path): + logging.error('Mount failed %s: %s', NAME, mnt_cmd) + return False + return True + +def unmount(full_mount_path): + # FIXME: Possible thundering herd problem here + + umnt_cmd = 'umount %s 2>> /dev/null' % full_mount_path + if os.system(umnt_cmd): + logging.error('Unable to unmount %s %s' % (full_mount_path, NAME)) + +def _get_export_list(): + cmnd = 'gluster --remote-host=%s volume info' % MOUNT_IP + + export_list = [] + + if os.system(cmnd + ' >> /dev/null'): + logging.error('Getting volume info failed for %s', NAME) + else: + fp = os.popen(cmnd) + while True: + item = fp.readline() + if not item: + break + item = item.strip('\n').strip(' ') + if item.lower().startswith('volume name:'): + export_list.append(item.split(':')[1].strip(' ')) + + return export_list + +def get_mnt_point(vol_name, conf_dir=SWIFT_DIR, conf_file="object-server*"): + """Read the object-server's configuration file and return + the device value""" + + mnt_dir = '' + conf_files = search_tree(conf_dir, conf_file, '.conf') + if not conf_files: + raise Exception("Config file not found") + + _conf = ConfigParser() + if _conf.read(conf_files[0]): + try: + mnt_dir = _conf.get('DEFAULT', 'devices', '') + except (NoSectionError, NoOptionError): + raise + return os.path.join(mnt_dir, vol_name) |