summaryrefslogtreecommitdiffstats
path: root/geo-replication/syncdaemon/gsyncdstatus.py
blob: e8a810f4b38b9b47ab6b158a1394885078f27564 (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
#!/usr/bin/python2
#
# Copyright (c) 2011-2014 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.
#

from __future__ import print_function
import fcntl
import os
import tempfile
try:
    import urllib.parse as urllib
except ImportError:
    import urllib
import json
import time
from datetime import datetime
from errno import EACCES, EAGAIN, ENOENT
import logging

from syncdutils import EVENT_GEOREP_ACTIVE, EVENT_GEOREP_PASSIVE, gf_event
from syncdutils import EVENT_GEOREP_CHECKPOINT_COMPLETED, lf

DEFAULT_STATUS = "N/A"
MONITOR_STATUS = ("Created", "Started", "Paused", "Stopped")
STATUS_VALUES = (DEFAULT_STATUS,
                 "Initializing...",
                 "Active",
                 "Passive",
                 "Faulty")

CRAWL_STATUS_VALUES = (DEFAULT_STATUS,
                       "Hybrid Crawl",
                       "History Crawl",
                       "Changelog Crawl")


def human_time(ts):
    try:
        return datetime.fromtimestamp(float(ts)).strftime("%Y-%m-%d %H:%M:%S")
    except ValueError:
        return DEFAULT_STATUS


def human_time_utc(ts):
    try:
        return datetime.utcfromtimestamp(
            float(ts)).strftime("%Y-%m-%d %H:%M:%S")
    except ValueError:
        return DEFAULT_STATUS


def get_default_values():
    return {
        "slave_node": DEFAULT_STATUS,
        "worker_status": DEFAULT_STATUS,
        "last_synced": 0,
        "last_synced_entry": 0,
        "crawl_status": DEFAULT_STATUS,
        "entry": 0,
        "data": 0,
        "meta": 0,
        "failures": 0,
        "checkpoint_completed": DEFAULT_STATUS,
        "checkpoint_time": 0,
        "checkpoint_completion_time": 0}


class LockedOpen(object):

    def __init__(self, filename, *args, **kwargs):
        self.filename = filename
        self.open_args = args
        self.open_kwargs = kwargs
        self.fileobj = None

    def __enter__(self):
        """
        If two processes compete to update a file, The first process
        gets the lock and the second process is blocked in the fcntl.flock()
        call. When first process replaces the file and releases the lock,
        the already open file descriptor in the second process now points
        to a  "ghost" file(not reachable by any path name) with old contents.
        To avoid that conflict, check the fd already opened is same or
        not. Open new one if not same
        """
        f = open(self.filename, *self.open_args, **self.open_kwargs)
        while True:
            fcntl.flock(f, fcntl.LOCK_EX)
            fnew = open(self.filename, *self.open_args, **self.open_kwargs)
            if os.path.sameopenfile(f.fileno(), fnew.fileno()):
                fnew.close()
                break
            else:
                f.close()
                f = fnew
        self.fileobj = f
        return f

    def __exit__(self, _exc_type, _exc_value, _traceback):
        self.fileobj.close()


def set_monitor_status(status_file, status):
    fd = os.open(status_file, os.O_CREAT | os.O_RDWR)
    os.close(fd)
    with LockedOpen(status_file, 'r+'):
        with tempfile.NamedTemporaryFile('w', dir=os.path.dirname(status_file),
                                         delete=False) as tf:
            tf.write(status)
            tempname = tf.name

        os.rename(tempname, status_file)
        dirfd = os.open(os.path.dirname(os.path.abspath(status_file)),
                        os.O_DIRECTORY)
        os.fsync(dirfd)
        os.close(dirfd)


class GeorepStatus(object):
    def __init__(self, monitor_status_file, master_node, brick, master_node_id,
                 master, slave, monitor_pid_file=None):
        self.master = master
        slv_data = slave.split("::")
        self.slave_host = slv_data[0]
        self.slave_volume = slv_data[1].split(":")[0]  # Remove Slave UUID
        self.work_dir = os.path.dirname(monitor_status_file)
        self.monitor_status_file = monitor_status_file
        self.filename = os.path.join(self.work_dir,
                                     "brick_%s.status"
                                     % urllib.quote_plus(brick))

        fd = os.open(self.filename, os.O_CREAT | os.O_RDWR)
        os.close(fd)
        fd = os.open(self.monitor_status_file, os.O_CREAT | os.O_RDWR)
        os.close(fd)
        self.master_node = master_node
        self.master_node_id = master_node_id
        self.brick = brick
        self.default_values = get_default_values()
        self.monitor_pid_file = monitor_pid_file

    def send_event(self, event_type, **kwargs):
        gf_event(event_type,
                 master_volume=self.master,
                 master_node=self.master_node,
                 master_node_id=self.master_node_id,
                 slave_host=self.slave_host,
                 slave_volume=self.slave_volume,
                 brick_path=self.brick,
                 **kwargs)

    def _update(self, mergerfunc):
        data = self.default_values
        with LockedOpen(self.filename, 'r+') as f:
            try:
                data.update(json.load(f))
            except ValueError:
                pass

            data = mergerfunc(data)
            # If Data is not changed by merger func
            if not data:
                return False

            with tempfile.NamedTemporaryFile(
                    'w',
                    dir=os.path.dirname(self.filename),
                    delete=False) as tf:
                tf.write(data)
                tempname = tf.name

            os.rename(tempname, self.filename)
            dirfd = os.open(os.path.dirname(os.path.abspath(self.filename)),
                            os.O_DIRECTORY)
            os.fsync(dirfd)
            os.close(dirfd)
            return True

    def reset_on_worker_start(self):
        def merger(data):
            data["slave_node"] = DEFAULT_STATUS
            data["crawl_status"] = DEFAULT_STATUS
            data["entry"] = 0
            data["data"] = 0
            data["meta"] = 0
            return json.dumps(data)

        self._update(merger)

    def set_field(self, key, value):
        def merger(data):
            # Current data and prev data is same
            if data[key] == value:
                return {}

            data[key] = value
            return json.dumps(data)

        return self._update(merger)

    def trigger_gf_event_checkpoint_completion(self, checkpoint_time,
                                               checkpoint_completion_time):
        self.send_event(EVENT_GEOREP_CHECKPOINT_COMPLETED,
                        checkpoint_time=checkpoint_time,
                        checkpoint_completion_time=checkpoint_completion_time)

    def set_last_synced(self, value, checkpoint_time):
        def merger(data):
            data["last_synced"] = value[0]

            # If checkpoint is not set or reset
            # or if last set checkpoint is changed
            if checkpoint_time == 0 or \
               checkpoint_time != data["checkpoint_time"]:
                data["checkpoint_time"] = 0
                data["checkpoint_completion_time"] = 0
                data["checkpoint_completed"] = "No"

            # If checkpoint is completed and not marked as completed
            # previously then update the checkpoint completed time
            if checkpoint_time > 0 and checkpoint_time <= value[0]:
                if data["checkpoint_completed"] == "No":
                    curr_time = int(time.time())
                    data["checkpoint_time"] = checkpoint_time
                    data["checkpoint_completion_time"] = curr_time
                    data["checkpoint_completed"] = "Yes"
                    logging.info(lf("Checkpoint completed",
                                    checkpoint_time=human_time_utc(
                                        checkpoint_time),
                                    completion_time=human_time_utc(curr_time)))
                    self.trigger_gf_event_checkpoint_completion(
                        checkpoint_time, curr_time)

            return json.dumps(data)

        self._update(merger)

    def set_worker_status(self, status):
        if self.set_field("worker_status", status):
            logging.info(lf("Worker Status Change",
                            status=status))

    def set_worker_crawl_status(self, status):
        if self.set_field("crawl_status", status):
            logging.info(lf("Crawl Status Change",
                            status=status))

    def set_slave_node(self, slave_node):
        def merger(data):
            data["slave_node"] = slave_node
            return json.dumps(data)

        self._update(merger)

    def inc_value(self, key, value):
        def merger(data):
            data[key] = data.get(key, 0) + value
            return json.dumps(data)

        self._update(merger)

    def dec_value(self, key, value):
        def merger(data):
            data[key] = data.get(key, 0) - value
            if data[key] < 0:
                data[key] = 0
            return json.dumps(data)

        self._update(merger)

    def set_active(self):
        if self.set_field("worker_status", "Active"):
            logging.info(lf("Worker Status Change",
                            status="Active"))
            self.send_event(EVENT_GEOREP_ACTIVE)

    def set_passive(self):
        if self.set_field("worker_status", "Passive"):
            logging.info(lf("Worker Status Change",
                            status="Passive"))
            self.send_event(EVENT_GEOREP_PASSIVE)

    def get_monitor_status(self):
        data = ""
        with open(self.monitor_status_file, "r") as f:
            data = f.read().strip()
        return data

    def get_status(self, checkpoint_time=0):
        """
        Monitor Status --->        Created    Started  Paused      Stopped
        ----------------------------------------------------------------------
        slave_node                 N/A        VALUE    VALUE       N/A
        status                     Created    VALUE    Paused      Stopped
        last_synced                N/A        VALUE    VALUE       VALUE
        last_synced_entry          N/A        VALUE    VALUE       VALUE
        crawl_status               N/A        VALUE    N/A         N/A
        entry                      N/A        VALUE    N/A         N/A
        data                       N/A        VALUE    N/A         N/A
        meta                       N/A        VALUE    N/A         N/A
        failures                   N/A        VALUE    VALUE       VALUE
        checkpoint_completed       N/A        VALUE    VALUE       VALUE
        checkpoint_time            N/A        VALUE    VALUE       VALUE
        checkpoint_completed_time  N/A        VALUE    VALUE       VALUE
        """
        data = self.default_values
        with open(self.filename) as f:
            try:
                data.update(json.load(f))
            except ValueError:
                pass
        monitor_status = self.get_monitor_status()

        # Verifying whether monitor process running and adjusting status
        if monitor_status in ["Started", "Paused"]:
            try:
                with open(self.monitor_pid_file, "r+") as f:
                    fcntl.lockf(f, fcntl.LOCK_EX | fcntl.LOCK_NB)
                    monitor_status = "Stopped"
            except (IOError, OSError) as e:
                # If pid file not exists, either monitor died or Geo-rep
                # not even started once
                if e.errno == ENOENT:
                    monitor_status = "Stopped"
                elif e.errno in (EACCES, EAGAIN):
                    # cannot grab. so, monitor process still running..move on
                    pass
                else:
                    raise

        if monitor_status in ["Created", "Paused", "Stopped"]:
            data["worker_status"] = monitor_status

        if monitor_status == "":
            data["worker_status"] = "Stopped"

        # Checkpoint adjustments
        if checkpoint_time == 0:
            data["checkpoint_completed"] = DEFAULT_STATUS
            data["checkpoint_time"] = DEFAULT_STATUS
            data["checkpoint_completion_time"] = DEFAULT_STATUS
        else:
            if checkpoint_time != data["checkpoint_time"]:
                if checkpoint_time <= data["last_synced"]:
                    data["checkpoint_completed"] = "Yes"
                    data["checkpoint_time"] = checkpoint_time
                    data["checkpoint_completion_time"] = data["last_synced"]
                else:
                    data["checkpoint_completed"] = "No"
                    data["checkpoint_time"] = checkpoint_time
                    data["checkpoint_completion_time"] = DEFAULT_STATUS

        if data["checkpoint_time"] not in [0, DEFAULT_STATUS]:
            chkpt_time = data["checkpoint_time"]
            data["checkpoint_time"] = human_time(chkpt_time)
            data["checkpoint_time_utc"] = human_time_utc(chkpt_time)

        if data["checkpoint_completion_time"] not in [0, DEFAULT_STATUS]:
            chkpt_completion_time = data["checkpoint_completion_time"]
            data["checkpoint_completion_time"] = human_time(
                chkpt_completion_time)
            data["checkpoint_completion_time_utc"] = human_time_utc(
                chkpt_completion_time)

        if data["last_synced"] == 0:
            data["last_synced"] = DEFAULT_STATUS
            data["last_synced_utc"] = DEFAULT_STATUS
        else:
            last_synced = data["last_synced"]
            data["last_synced"] = human_time(last_synced)
            data["last_synced_utc"] = human_time_utc(last_synced)

        if data["worker_status"] != "Active":
            data["last_synced"] = DEFAULT_STATUS
            data["last_synced_utc"] = DEFAULT_STATUS
            data["crawl_status"] = DEFAULT_STATUS
            data["entry"] = DEFAULT_STATUS
            data["data"] = DEFAULT_STATUS
            data["meta"] = DEFAULT_STATUS
            data["failures"] = DEFAULT_STATUS
            data["checkpoint_completed"] = DEFAULT_STATUS
            data["checkpoint_time"] = DEFAULT_STATUS
            data["checkpoint_completed_time"] = DEFAULT_STATUS
            data["checkpoint_time_utc"] = DEFAULT_STATUS
            data["checkpoint_completion_time_utc"] = DEFAULT_STATUS

        if data["worker_status"] not in ["Active", "Passive"]:
            data["slave_node"] = DEFAULT_STATUS

        if data.get("last_synced_utc", 0) == 0:
            data["last_synced_utc"] = DEFAULT_STATUS

        if data.get("checkpoint_completion_time_utc", 0) == 0:
            data["checkpoint_completion_time_utc"] = DEFAULT_STATUS

        if data.get("checkpoint_time_utc", 0) == 0:
            data["checkpoint_time_utc"] = DEFAULT_STATUS

        return data

    def print_status(self, checkpoint_time=0, json_output=False):
        status_out = self.get_status(checkpoint_time)
        if json_output:
            out = {}
            # Convert all values as string
            for k, v in status_out.items():
                out[k] = str(v)
            print(json.dumps(out))
            return

        for key, value in status_out.items():
            print(("%s: %s" % (key, value)))