#!/usr/bin/python3
# -*- coding: utf-8 -*-
# Copyright (c) 2015 Red Hat, Inc. <http://www.redhat.com/>
# This file is part of GlusterFS.
#
# This file is licensed to you under your choice of the GNU Lesser
# General Public License, version 3 or any later version (LGPLv3 or
# later), or the GNU General Public License, version 2 (GPLv2), in all
# cases as published by the Free Software Foundation.
import os
import sys
import time
import xattr
import logging
from argparse import ArgumentParser, RawDescriptionHelpFormatter
import hashlib
try:
import urllib.parse as urllib
except ImportError:
import urllib
import codecs
import libgfchangelog
from utils import mkdirp, symlink_gfid_to_path
from utils import fail, setup_logger, find
from utils import get_changelog_rollover_time
from utils import output_path_prepare
from changelogdata import ChangelogData
import conf
CHANGELOG_LOG_LEVEL = 9
CHANGELOG_CONN_RETRIES = 5
CHANGELOGAPI_NUM_WORKERS = 3
PROG_DESCRIPTION = """
Changelog Crawler
"""
history_turns = 0
history_turn_time = 0
logger = logging.getLogger()
def pgfid_to_path(brick, changelog_data):
"""
For all the pgfids in table, converts into path using recursive
readlink.
"""
# pgfid1 to path1 in case of CREATE/MKNOD/MKDIR/LINK/SYMLINK
for row in changelog_data.gfidpath_get_distinct("pgfid1", {"path1": ""}):
# In case of Data/Metadata only, pgfid1 will not be their
if row[0] == "":
continue
try:
path = symlink_gfid_to_path(brick, row[0])
path = output_path_prepare(path, args)
changelog_data.gfidpath_set_path1(path, row[0])
except (IOError, OSError) as e:
logger.warn("Error converting to path: %s" % e)
continue
# pgfid2 to path2 in case of RENAME
for row in changelog_data.gfidpath_get_distinct("pgfid2",
{"type": "RENAME",
"path2": ""}):
# Only in case of Rename pgfid2 exists
if row[0] == "":
continue
try:
path = symlink_gfid_to_path(brick, row[0])
path = output_path_prepare(path, args)
changelog_data.gfidpath_set_path2(path, row[0])
except (IOError, OSError) as e:
logger.warn("Error converting to path: %s" % e)
continue
def populate_pgfid_and_inodegfid(brick, changelog_data):
"""
For all the DATA/METADATA modifications GFID,
If symlink, directly convert to Path using Readlink.
If not symlink, try to get PGFIDs via xattr query and populate it
to pgfid table, collect inodes in inodegfid table
"""
for row in changelog_data.gfidpath_get({"path1": "", "type": "MODIFY"}):
gfid = row[3].strip()
p = os.path.join(brick, ".glusterfs", gfid[0:2], gfid[2:4], gfid)
if os.path.islink(p):
# It is a Directory if GFID backend path is symlink
try:
path = symlink_gfid_to_path(brick, gfid)
path = output_path_prepare(path, args)
changelog_data.gfidpath_update({"path1": path},
{"gfid": gfid})
except (IOError, OSError) as e:
logger.warn("Error converting to path: %s" % e)
continue
else:
try:
# INODE and GFID to inodegfid table
changelog_data.inodegfid_add(os.stat(p).st_ino, gfid)
file_xattrs = xattr.list(p)
for x in file_xattrs:
if x.startswith("trusted.pgfid."):
# PGFID in pgfid table
changelog_data.pgfid_add(x.split(".")[-1])
except (IOError, OSError):
# All OS Errors ignored, since failures will be logged
# in End. All GFIDs present in gfidpath table
continue
def gfid_to_path_using_pgfid(brick, changelog_data, args):
"""
For all the pgfids collected, Converts to Path and
does readdir on those directories and looks up inodegfid
table for matching inode number.
"""
populate_pgfid_and_inodegfid(brick, changelog_data)
# If no GFIDs needs conversion to Path
if not changelog_data.inodegfid_exists({"converted": 0}):
return
def inode_filter(path):
# Looks in inodegfid table, if exists returns
# inode number else None
try:
st = os.lstat(path)
except (OSError, IOError):
st = None
if st and changelog_data.inodegfid_exists({"inode": st.st_ino}):
return st.st_ino
return None
# Length of brick path, to remove from output path
brick_path_len = len(brick)
def output_callback(path, inode):
# For each path found, encodes it and updates path1
# Also updates converted flag in inodegfid table as 1
path = path.strip()
path = path[brick_path_len+1:]
path = output_path_prepare(path, args)
changelog_data.append_path1(path, inode)
changelog_data.inodegfid_update({"converted": 1}, {"inode": inode})
ignore_dirs = [os.path.join(brick, dirname)
for dirname in
conf.get_opt("brick_ignore_dirs").split(",")]
for row in changelog_data.pgfid_get():
try:
path = symlink_gfid_to_path(brick, row[0])
find(os.path.join(brick, path),
callback_func=output_callback,
filter_func=inode_filter,
ignore_dirs=ignore_dirs,
subdirs_crawl=False)
except (IOError, OSError) as e:
logger.warn("Error converting to path: %s" % e)
continue
def gfid_to_path_using_batchfind(brick, changelog_data):
# If all the GFIDs converted using gfid_to_path_using_pgfid
if not changelog_data.inodegfid_exists({"converted": 0}):
return
def inode_filter(path):
# Looks in inodegfid table, if exists returns
# inode number else None
try:
st = os.lstat(path)
except (OSError, IOError):
st = None
if st and changelog_data.inodegfid_exists({"inode": st.st_ino}):
return st.st_ino
return None
# Length of brick path, to remove from output path
brick_path_len = len(brick)
def output_callback(path, inode):
# For each path found, encodes it and updates path1
# Also updates converted flag in inodegfid table as 1
path = path.strip()
path = path[brick_path_len+1:]
path = output_path_prepare(path, args)
changelog_data.append_path1(path, inode)
ignore_dirs = [os.path.join(brick, dirname)
for dirname in
conf.get_opt("brick_ignore_dirs").split(",")]
# Full Namespace Crawl
find(brick, callback_func=output_callback,
filter_func=inode_filter,
ignore_dirs=ignore_dirs)
def parse_changelog_to_db(changelog_data, filename, args):
"""
Parses a Changelog file and populates data in gfidpath table
"""
with codecs.open(filename, encoding="utf-8") as f:
changelogfile = os.path.basename(filename)
for line in f:
data = line.strip().split(" ")
if data[0] == "E" and data[2] in ["CREATE", "MKNOD", "MKDIR"]:
# CREATE/MKDIR/MKNOD
changelog_data.when_create_mknod_mkdir(changelogfile, data)
elif data[0] in ["D", "M"]:
# DATA/META
if not args.only_namespace_changes:
changelog_data.when_data_meta(changelogfile, data)
elif data[0] == "E" and data[2] in ["LINK", "SYMLINK"]:
# LINK/SYMLINK
changelog_data.when_link_symlink(changelogfile, data)
elif data[0] == "E" and data[2] == "RENAME":
# RENAME
changelog_data.when_rename(changelogfile, data)
elif data[0] == "E" and data[2] in ["UNLINK", "RMDIR"]:
# UNLINK/RMDIR
changelog_data.when_unlink_rmdir(changelogfile, data)
def get_changes(brick, hash_dir, log_file, start, end, args):
"""
Makes use of libgfchangelog's history API to get changelogs
containing changes from start and end time. Further collects
the modified gfids from the changelogs and writes the list
of gfid to 'gfid_list' file.
"""
session_dir = os.path.join(conf.get_opt("session_dir"),
args.session)
status_file = os.path.join(session_dir, args.volume,
"%s.status" % urllib.quote_plus(args.brick))
# Get previous session
try:
with open(status_file) as f:
start = int(f.read().strip())
except (ValueError, OSError, IOError):
start = args.start
try:
libgfchangelog.cl_init()
libgfchangelog.cl_register(brick, hash_dir, log_file,
CHANGELOG_LOG_LEVEL, CHANGELOG_CONN_RETRIES)
except libgfchangelog.ChangelogException as e:
fail("%s Changelog register failed: %s" % (brick, e), logger=logger)
# Output files to record GFIDs and GFID to Path failure GFIDs
changelog_data = ChangelogData(args.outfile, args)
# Changelogs path(Hard coded to BRICK/.glusterfs/changelogs
cl_path = os.path.join(brick, ".glusterfs/changelogs")
# Fail if History fails for requested Start and End
try:
actual_end = libgfchangelog.cl_history_changelog(
cl_path, start, end, CHANGELOGAPI_NUM_WORKERS)
except libgfchangelog.ChangelogException as e:
fail("%s: %s Historical Changelogs not available: %s" %
(args.node, brick, e), logger=logger)
logger.info("[1/4] Starting changelog parsing ...")
try:
# scan followed by getchanges till scan returns zero.
# history_scan() is blocking call, till it gets the number
# of changelogs to process. Returns zero when no changelogs
# to be processed. returns positive value as number of changelogs
# to be processed, which will be fetched using
# history_getchanges()
changes = []
while libgfchangelog.cl_history_scan() > 0:
changes = libgfchangelog.cl_history_getchanges()
for change in changes:
# Ignore if last processed changelog comes
# again in list
if change.endswith(".%s" % start):
continue
try:
parse_changelog_to_db(changelog_data, change, args)
libgfchangelog.cl_history_done(change)
except IOError as e:
logger.warn("Error parsing changelog file %s: %s" %
(change, e))
changelog_data.commit()
except libgfchangelog.ChangelogException as e:
fail("%s Error during Changelog Crawl: %s" % (brick, e),
logger=logger)
logger.info("[1/4] Finished changelog parsing.")
# Convert all pgfid available from Changelogs
logger.info("[2/4] Starting 'pgfid to path' conversions ...")
pgfid_to_path(brick, changelog_data)
changelog_data.commit()
logger.info("[2/4] Finished 'pgfid to path' conversions.")
# Convert all GFIDs for which no other additional details available
logger.info("[3/4] Starting 'gfid to path using pgfid' conversions ...")
gfid_to_path_using_pgfid(brick, changelog_data, args)
changelog_data.commit()
logger.info("[3/4] Finished 'gfid to path using pgfid' conversions.")
# If some GFIDs fail to get converted from previous step,
# convert using find
logger.info("[4/4] Starting 'gfid to path using batchfind' "
"conversions ...")
gfid_to_path_using_batchfind(brick, changelog_data)
changelog_data.commit()
logger.info("[4/4] Finished 'gfid to path using batchfind' conversions.")
return actual_end
def changelog_crawl(brick, start, end, args):
"""
Init function, prepares working dir and calls Changelog query
"""
if brick.endswith("/"):
brick = brick[0:len(brick)-1]
# WORKING_DIR/BRICKHASH/OUTFILE
working_dir = os.path.dirname(args.outfile)
brickhash = hashlib.sha1(brick.encode())
brickhash = str(brickhash.hexdigest())
working_dir = os.path.join(working_dir, brickhash)
mkdirp(working_dir, exit_on_err=True, logger=logger)
log_file = os.path.join(conf.get_opt("log_dir"),
args.session,
args.volume,
"changelog.%s.log" % brickhash)
logger.info("%s Started Changelog Crawl. Start: %s, End: %s"
% (brick, start, end))
return get_changes(brick, working_dir, log_file, start, end, args)
def _get_args():
parser = ArgumentParser(formatter_class=RawDescriptionHelpFormatter,
description=PROG_DESCRIPTION)
parser.add_argument("session", help="Session Name")
parser.add_argument("volume", help="Volume Name")
parser.add_argument("node", help="Node Name")
parser.add_argument("brick", help="Brick Name")
parser.add_argument("outfile", help="Output File")
parser.add_argument("start", help="Start Time", type=int)
parser.add_argument("end", help="End Time", type=int)
parser.add_argument("--only-query", help="Query mode only (no session)",
action="store_true")
parser.add_argument("--debug", help="Debug", action="store_true")
parser.add_argument("--no-encode",
help="Do not encode path in outfile",
action="store_true")
parser.add_argument("--output-prefix", help="File prefix in output",
default=".")
parser.add_argument("--type",default="both")
parser.add_argument("-N", "--only-namespace-changes",
help="List only namespace changes",
action="store_true")
return parser.parse_args()
if __name__ == "__main__":
args = _get_args()
mkdirp(os.path.join(conf.get_opt("log_dir"), args.session, args.volume),
exit_on_err=True)
log_file = os.path.join(conf.get_opt("log_dir"),
args.session,
args.volume,
"changelog.log")
setup_logger(logger, log_file, args.debug)
session_dir = os.path.join(conf.get_opt("session_dir"), args.session)
status_file = os.path.join(session_dir, args.volume,
"%s.status" % urllib.quote_plus(args.brick))
status_file_pre = status_file + ".pre"
mkdirp(os.path.join(session_dir, args.volume), exit_on_err=True,
logger=logger)
end = -1
if args.only_query:
start = args.start
end = args.end
else:
try:
with open(status_file) as f:
start = int(f.read().strip())
except (ValueError, OSError, IOError):
start = args.start
# end time is optional; so a -1 may be sent to use the default method of
# identifying the end time
if end == -1:
end = int(time.time()) - get_changelog_rollover_time(args.volume)
logger.info("%s Started Changelog Crawl - Start: %s End: %s" % (args.brick,
start,
end))
actual_end = changelog_crawl(args.brick, start, end, args)
if not args.only_query:
with open(status_file_pre, "w") as f:
f.write(str(actual_end))
logger.info("%s Finished Changelog Crawl - End: %s" % (args.brick,
actual_end))
sys.exit(0)