summaryrefslogtreecommitdiffstats
path: root/tools/glusterfind/src/main.py
blob: 9bc4872ad9bcc244a330c1309a552c89f7edb8fd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
#!/usr/bin/env python

# 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 sys
from errno import ENOENT, ENOTEMPTY
import time
from multiprocessing import Process
import os
import xml.etree.cElementTree as etree
from argparse import ArgumentParser, RawDescriptionHelpFormatter, Action
import logging
import shutil

from utils import execute, is_host_local, mkdirp, fail
from utils import setup_logger, human_time, handle_rm_error
from utils import get_changelog_rollover_time, cache_output, create_file
import conf
from changelogdata import OutputMerger

PROG_DESCRIPTION = """
GlusterFS Incremental API
"""
ParseError = etree.ParseError if hasattr(etree, 'ParseError') else SyntaxError

logger = logging.getLogger()
node_outfiles = []
vol_statusStr = ""


class StoreAbsPath(Action):
    def __init__(self, option_strings, dest, nargs=None, **kwargs):
        super(StoreAbsPath, self).__init__(option_strings, dest, **kwargs)

    def __call__(self, parser, namespace, values, option_string=None):
        setattr(namespace, self.dest, os.path.abspath(values))


def get_pem_key_path(session, volume):
    return os.path.join(conf.get_opt("session_dir"),
                        session,
                        volume,
                        "%s_%s_secret.pem" % (session, volume))


def node_cmd(host, host_uuid, task, cmd, args, opts):
    """
    Runs command via ssh if host is not local
    """
    try:
        localdir = is_host_local(host_uuid)

        # this is so to avoid deleting the ssh keys on local node which
        # otherwise cause ssh password prompts on the console (race conditions)
        # mode_delete() should be cleaning up the session tree
        if localdir and task == "delete":
            return

        pem_key_path = get_pem_key_path(args.session, args.volume)

        if not localdir:
            # prefix with ssh command if not local node
            cmd = ["ssh",
                   "-oNumberOfPasswordPrompts=0",
                   "-oStrictHostKeyChecking=no",
                   "-i", pem_key_path,
                   "root@%s" % host] + cmd

        execute(cmd, exit_msg="%s - %s failed" % (host, task), logger=logger)

        if opts.get("copy_outfile", False) and not localdir:
            cmd_copy = ["scp",
                        "-oNumberOfPasswordPrompts=0",
                        "-oStrictHostKeyChecking=no",
                        "-i", pem_key_path,
                        "root@%s:/%s" % (host, opts.get("node_outfile")),
                        os.path.dirname(opts.get("node_outfile"))]
            execute(cmd_copy, exit_msg="%s - Copy command failed" % host,
                    logger=logger)
    except KeyboardInterrupt:
        sys.exit(2)


def run_cmd_nodes(task, args, **kwargs):
    global node_outfiles
    nodes = get_nodes(args.volume)
    pool = []
    for num, node in enumerate(nodes):
        host, brick = node[1].split(":")
        host_uuid = node[0]
        cmd = []
        opts = {}
        node_outfile = os.path.join(conf.get_opt("working_dir"),
                                    args.session, args.volume,
                                    "tmp_output_%s" % num)

        if task == "pre":
            if vol_statusStr != "Started":
                fail("Volume %s is not online" % args.volume,
                     logger=logger)

            # If Full backup is requested or start time is zero, use brickfind
            change_detector = conf.get_change_detector("changelog")
            if args.full:
                change_detector = conf.get_change_detector("brickfind")

            node_outfiles.append(node_outfile)

            cmd = [change_detector,
                   args.session,
                   args.volume,
                   brick,
                   node_outfile,
                   str(kwargs.get("start")),
                   "--output-prefix",
                   args.output_prefix] + \
                (["--debug"] if args.debug else []) + \
                (["--only-namespace-changes"] if args.only_namespace_changes
                 else [])

            opts["node_outfile"] = node_outfile
            opts["copy_outfile"] = True
        elif task == "cleanup":
            # After pre run, cleanup the working directory and other temp files
            # Remove the copied node_outfile in main node
            try:
                os.remove(node_outfile)
            except (OSError, IOError):
                logger.warn("Failed to cleanup temporary file %s" %
                            node_outfile)
                pass

            cmd = [conf.get_opt("nodeagent"),
                   "cleanup",
                   args.session,
                   args.volume] + (["--debug"] if args.debug else [])
        elif task == "create":
            if vol_statusStr != "Started":
                fail("Volume %s is not online" % args.volume,
                     logger=logger)

            # When glusterfind create, create session directory in
            # each brick nodes
            cmd = [conf.get_opt("nodeagent"),
                   "create",
                   args.session,
                   args.volume,
                   brick,
                   kwargs.get("time_to_update")] + \
                (["--debug"] if args.debug else []) + \
                (["--reset-session-time"] if args.reset_session_time
                 else [])
        elif task == "post":
            # Rename pre status file to actual status file in each node
            cmd = [conf.get_opt("nodeagent"),
                   "post",
                   args.session,
                   args.volume,
                   brick] + \
                (["--debug"] if args.debug else [])
        elif task == "delete":
            # When glusterfind delete, cleanup all the session files/dirs
            # from each node.
            cmd = [conf.get_opt("nodeagent"),
                   "delete",
                   args.session,
                   args.volume] + \
                (["--debug"] if args.debug else [])

        if cmd:
            p = Process(target=node_cmd,
                        args=(host, host_uuid, task, cmd, args, opts))
            p.start()
            pool.append(p)

    for num, p in enumerate(pool):
        p.join()
        if p.exitcode != 0:
            logger.warn("Command %s failed in %s" % (task, nodes[num][1]))
            if task in ["create", "delete"]:
                fail("Command %s failed in %s" % (task, nodes[num][1]))
            elif task == "pre" and args.disable_partial:
                sys.exit(1)


@cache_output
def get_nodes(volume):
    """
    Get the gluster volume info xml output and parse to get
    the brick details.
    """
    global vol_statusStr

    cmd = ["gluster", 'volume', 'info', volume, "--xml"]
    _, data, _ = execute(cmd,
                         exit_msg="Failed to Run Gluster Volume Info",
                         logger=logger)
    tree = etree.fromstring(data)

    # Test to check if volume has been deleted after session creation
    count_el = tree.find('volInfo/volumes/count')
    if int(count_el.text) == 0:
        fail("Unable to get volume details", logger=logger)

    # this status is used in caller: run_cmd_nodes
    vol_statusStr = tree.find('volInfo/volumes/volume/statusStr').text

    nodes = []
    volume_el = tree.find('volInfo/volumes/volume')
    try:
        for b in volume_el.findall('bricks/brick'):
            nodes.append((b.find('hostUuid').text,
                          b.find('name').text))
    except (ParseError, AttributeError, ValueError) as e:
        fail("Failed to parse Volume Info: %s" % e, logger=logger)

    return nodes


def _get_args():
    parser = ArgumentParser(formatter_class=RawDescriptionHelpFormatter,
                            description=PROG_DESCRIPTION)
    subparsers = parser.add_subparsers(dest="mode")

    # create <SESSION> <VOLUME> [--debug] [--force]
    parser_create = subparsers.add_parser('create')
    parser_create.add_argument("session", help="Session Name")
    parser_create.add_argument("volume", help="Volume Name")
    parser_create.add_argument("--debug", help="Debug", action="store_true")
    parser_create.add_argument("--force", help="Force option to recreate "
                               "the session", action="store_true")
    parser_create.add_argument("--reset-session-time",
                               help="Reset Session Time to Current Time",
                               action="store_true")

    # delete <SESSION> <VOLUME> [--debug]
    parser_delete = subparsers.add_parser('delete')
    parser_delete.add_argument("session", help="Session Name")
    parser_delete.add_argument("volume", help="Volume Name")
    parser_delete.add_argument("--debug", help="Debug", action="store_true")

    # list [--session <SESSION>] [--volume <VOLUME>]
    parser_list = subparsers.add_parser('list')
    parser_list.add_argument("--session", help="Session Name", default="")
    parser_list.add_argument("--volume", help="Volume Name", default="")
    parser_list.add_argument("--debug", help="Debug", action="store_true")

    # pre <SESSION> <VOLUME> <OUTFILE>
    #     [--output-prefix <OUTPUT_PREFIX>] [--full]
    parser_pre = subparsers.add_parser('pre')
    parser_pre.add_argument("session", help="Session Name")
    parser_pre.add_argument("volume", help="Volume Name")
    parser_pre.add_argument("outfile", help="Output File", action=StoreAbsPath)
    parser_pre.add_argument("--debug", help="Debug", action="store_true")
    parser_pre.add_argument("--full", help="Full find", action="store_true")
    parser_pre.add_argument("--disable-partial", help="Disable Partial find, "
                            "Fail when one node fails", action="store_true")
    parser_pre.add_argument("--output-prefix", help="File prefix in output",
                            default=".")
    parser_pre.add_argument("--regenerate-outfile",
                            help="Regenerate outfile, discard the outfile "
                            "generated from last pre command",
                            action="store_true")
    parser_pre.add_argument("-N", "--only-namespace-changes",
                            help="List only namespace changes",
                            action="store_true")

    # post <SESSION> <VOLUME>
    parser_post = subparsers.add_parser('post')
    parser_post.add_argument("session", help="Session Name")
    parser_post.add_argument("volume", help="Volume Name")
    parser_post.add_argument("--debug", help="Debug", action="store_true")

    return parser.parse_args()


def ssh_setup(args):
    pem_key_path = get_pem_key_path(args.session, args.volume)

    if not os.path.exists(pem_key_path):
        # Generate ssh-key
        cmd = ["ssh-keygen",
               "-N",
               "",
               "-f",
               pem_key_path]
        execute(cmd,
                exit_msg="Unable to generate ssh key %s"
                % pem_key_path,
                logger=logger)

        logger.info("Ssh key generated %s" % pem_key_path)

    try:
        shutil.copyfile(pem_key_path + ".pub",
                        os.path.join(conf.get_opt("session_dir"),
                                     ".keys",
                                     "%s_%s_secret.pem.pub" % (args.session,
                                                               args.volume)))
    except (IOError, OSError) as e:
        fail("Failed to copy public key to %s: %s"
             % (os.path.join(conf.get_opt("session_dir"), ".keys"), e),
             logger=logger)

    # Copy pub file to all nodes
    cmd = ["gluster",
           "system::",
           "copy",
           "file",
           "/glusterfind/.keys/%s.pub" % os.path.basename(pem_key_path)]

    execute(cmd, exit_msg="Failed to distribute ssh keys", logger=logger)

    logger.info("Distributed ssh key to all nodes of Volume")

    # Add to authorized_keys file in each node
    cmd = ["gluster",
           "system::",
           "execute",
           "add_secret_pub",
           "root",
           "/glusterfind/.keys/%s.pub" % os.path.basename(pem_key_path)]
    execute(cmd,
            exit_msg="Failed to add ssh keys to authorized_keys file",
            logger=logger)

    logger.info("Ssh key added to authorized_keys of Volume nodes")


def mode_create(session_dir, args):
    logger.debug("Init is called - Session: %s, Volume: %s"
                 % (args.session, args.volume))

    cmd = ["gluster", 'volume', 'info', args.volume, "--xml"]
    _, data, _ = execute(cmd,
                         exit_msg="Failed to Run Gluster Volume Info",
                         logger=logger)
    try:
        tree = etree.fromstring(data)
        statusStr = tree.find('volInfo/volumes/volume/statusStr').text
    except (ParseError, AttributeError) as e:
        fail("Invalid Volume: %s" % e, logger=logger)

    if statusStr != "Started":
        fail("Volume %s is not online" % args.volume, logger=logger)

    mkdirp(session_dir, exit_on_err=True, logger=logger)
    mkdirp(os.path.join(session_dir, args.volume), exit_on_err=True,
           logger=logger)
    status_file = os.path.join(session_dir, args.volume, "status")

    if os.path.exists(status_file) and not args.force:
        fail("Session %s already created" % args.session, logger=logger)

    if not os.path.exists(status_file) or args.force:
        ssh_setup(args)

        execute(["gluster", "volume", "set",
                 args.volume, "build-pgfid", "on"],
                exit_msg="Failed to set volume option build-pgfid on",
                logger=logger)
        logger.info("Volume option set %s, build-pgfid on" % args.volume)

        execute(["gluster", "volume", "set",
                 args.volume, "changelog.changelog", "on"],
                exit_msg="Failed to set volume option "
                "changelog.changelog on", logger=logger)
        logger.info("Volume option set %s, changelog.changelog on"
                    % args.volume)

        execute(["gluster", "volume", "set",
                 args.volume, "changelog.capture-del-path", "on"],
                exit_msg="Failed to set volume option "
                "changelog.capture-del-path on", logger=logger)
        logger.info("Volume option set %s, changelog.capture-del-path on"
                    % args.volume)

    # Add Rollover time to current time to make sure changelogs
    # will be available if we use this time as start time
    time_to_update = int(time.time()) + get_changelog_rollover_time(
        args.volume)

    run_cmd_nodes("create", args, time_to_update=str(time_to_update))

    if not os.path.exists(status_file) or args.reset_session_time:
        with open(status_file, "w", buffering=0) as f:
            f.write(str(time_to_update))

    sys.stdout.write("Session %s created with volume %s\n" %
                     (args.session, args.volume))

    sys.exit(0)


def mode_pre(session_dir, args):
    """
    Read from Session file and write to session.pre file
    """
    endtime_to_update = int(time.time()) - get_changelog_rollover_time(
        args.volume)
    status_file = os.path.join(session_dir, args.volume, "status")
    status_file_pre = status_file + ".pre"

    mkdirp(os.path.dirname(args.outfile), exit_on_err=True, logger=logger)

    # If Pre status file exists and running pre command again
    if os.path.exists(status_file_pre) and not args.regenerate_outfile:
        fail("Post command is not run after last pre, "
             "use --regenerate-outfile")

    start = 0
    try:
        with open(status_file) as f:
            start = int(f.read().strip())
    except ValueError:
        pass
    except (OSError, IOError) as e:
        fail("Error Opening Session file %s: %s"
             % (status_file, e), logger=logger)

    logger.debug("Pre is called - Session: %s, Volume: %s, "
                 "Start time: %s, End time: %s"
                 % (args.session, args.volume, start, endtime_to_update))

    run_cmd_nodes("pre", args, start=start)

    # Merger
    if args.full:
        cmd = ["sort", "-u"] + node_outfiles + ["-o", args.outfile]
        execute(cmd,
                exit_msg="Failed to merge output files "
                "collected from nodes", logger=logger)
    else:
        # Read each Changelogs db and generate finaldb
        create_file(args.outfile, exit_on_err=True, logger=logger)
        outfilemerger = OutputMerger(args.outfile + ".db", node_outfiles)

        with open(args.outfile, "a") as f:
            for row in outfilemerger.get():
                # Multiple paths in case of Hardlinks
                paths = row[1].split(",")
                for p in paths:
                    if p == "" or p.replace("%2F%2F","%2F") == \
                       row[2].replace("%2F%2F","%2F"):
                        continue
                    f.write("%s %s %s\n" % (row[0], p, row[2]))

    try:
        os.remove(args.outfile + ".db")
    except (IOError, OSError):
        pass

    run_cmd_nodes("cleanup", args)

    with open(status_file_pre, "w", buffering=0) as f:
        f.write(str(endtime_to_update))

    sys.stdout.write("Generated output file %s\n" % args.outfile)


def mode_post(session_dir, args):
    """
    If pre session file exists, overwrite session file
    If pre session file does not exists, return ERROR
    """
    status_file = os.path.join(session_dir, args.volume, "status")
    logger.debug("Post is called - Session: %s, Volume: %s"
                 % (args.session, args.volume))
    status_file_pre = status_file + ".pre"

    if os.path.exists(status_file_pre):
        run_cmd_nodes("post", args)
        os.rename(status_file_pre, status_file)
        sys.stdout.write("Session %s with volume %s updated\n" %
                         (args.session, args.volume))
        sys.exit(0)
    else:
        fail("Pre script is not run", logger=logger)


def mode_delete(session_dir, args):
    run_cmd_nodes("delete", args)
    shutil.rmtree(os.path.join(session_dir, args.volume),
                  onerror=handle_rm_error)
    sys.stdout.write("Session %s with volume %s deleted\n" %
                     (args.session, args.volume))

    # If the session contains only this volume, then cleanup the
    # session directory. If a session contains multiple volumes
    # then os.rmdir will fail with ENOTEMPTY
    try:
        os.rmdir(session_dir)
    except OSError as e:
        if not e.errno == ENOTEMPTY:
            logger.warn("Failed to delete session directory: %s" % e)


def mode_list(session_dir, args):
    """
    List available sessions to stdout, if session name is set
    only list that session.
    """
    if args.session:
        if not os.path.exists(os.path.join(session_dir, args.session)):
            fail("Invalid Session", logger=logger)
        sessions = [args.session]
    else:
        sessions = []
        for d in os.listdir(session_dir):
            if d != ".keys":
                sessions.append(d)

    output = []
    for session in sessions:
        # Session Volume Last Processed
        volnames = os.listdir(os.path.join(session_dir, session))

        for volname in volnames:
            if args.volume and args.volume != volname:
                continue

            status_file = os.path.join(session_dir, session, volname, "status")
            last_processed = None
            try:
                with open(status_file) as f:
                    last_processed = f.read().strip()
            except (OSError, IOError) as e:
                if e.errno == ENOENT:
                    continue
                else:
                    raise
            output.append((session, volname, last_processed))

    if output:
        sys.stdout.write("%s %s %s\n" % ("SESSION".ljust(25),
                                         "VOLUME".ljust(25),
                                         "SESSION TIME".ljust(25)))
        sys.stdout.write("-"*75)
        sys.stdout.write("\n")
    for session, volname, last_processed in output:
        sess_time = 'Session Corrupted'
        if last_processed:
            try:
                sess_time = human_time(last_processed)
            except TypeError:
                sess_time = 'Session Corrupted'
        sys.stdout.write("%s %s %s\n" % (session.ljust(25),
                                         volname.ljust(25),
                                         sess_time.ljust(25)))

    if not output:
        if args.session or args.volume:
            fail("Invalid Session", logger=logger)
        else:
            sys.stdout.write("No sessions found.\n")


def main():
    try:
        args = _get_args()
        mkdirp(conf.get_opt("session_dir"), exit_on_err=True)

        if args.mode == "list":
            session_dir = conf.get_opt("session_dir")
        else:
            session_dir = os.path.join(conf.get_opt("session_dir"),
                                       args.session)

        if not os.path.exists(session_dir) and args.mode not in ["create",
                                                                 "list"]:
            fail("Invalid session %s" % args.session)

        vol_dir = os.path.join(session_dir, args.volume)
        if not os.path.exists(vol_dir) and args.mode not in ["create", "list"]:
            fail("Session %s not created with volume %s" %
                 (args.session, args.volume))

        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,
                                "cli.log")
        setup_logger(logger, log_file, args.debug)

        # globals() will have all the functions already defined.
        # mode_<args.mode> will be the function name to be called
        globals()["mode_" + args.mode](session_dir, args)
    except KeyboardInterrupt:
        # Interrupted, exit with non zero error code
        sys.exit(2)