summaryrefslogtreecommitdiffstats
path: root/geo-replication/syncdaemon/gsyncdconfig.py
blob: 67a367c869527c8ed81c3f807693cbf042a1c556 (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
# -*- coding: utf-8 -*-
#
#  Copyright (c) 2016 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.
#

try:
    from configparser import ConfigParser as ConfigParser, NoSectionError
except ImportError:
    from ConfigParser import ConfigParser, NoSectionError
import os
from string import Template
from datetime import datetime


# Global object which can be used in other modules
# once load_config is called
_gconf = {}


class GconfNotConfigurable(Exception):
    pass


class GconfInvalidValue(Exception):
    pass


class Gconf(object):
    def __init__(self, default_conf_file, custom_conf_file=None,
                 args={}, extra_tmpl_args={}, override_from_args=False):
        self.default_conf_file = default_conf_file
        self.custom_conf_file = custom_conf_file
        self.tmp_conf_file = None
        self.gconf = {}
        self.gconfdata = {}
        self.gconf_typecast = {}
        self.template_conf = []
        self.non_configurable_configs = []
        self.prev_mtime = 0
        if custom_conf_file is not None:
            self.tmp_conf_file = custom_conf_file + ".tmp"

        self.session_conf_items = []
        self.args = args
        self.extra_tmpl_args = extra_tmpl_args
        self.override_from_args = override_from_args
        # Store default values only if overwritten, Only for JSON/CLI output
        self.default_values = {}
        self._load()

    def _tmpl_substitute(self):
        tmpl_values = {}
        for k, v in self.gconf.items():
            tmpl_values[k.replace("-", "_")] = v

        # override the config file values with the one user passed
        for k, v in self.args.items():
            # override the existing value only if set by user
            if v is not None:
                tmpl_values[k] = v

        for k, v in self.extra_tmpl_args.items():
            tmpl_values[k] = v

        for k, v in self.gconf.items():
            if k in self.template_conf and \
               (isinstance(v, str) or isinstance(v, unicode)):
                self.gconf[k] = Template(v).safe_substitute(tmpl_values)

    def _do_typecast(self):
        for k, v in self.gconf.items():
            cast_func = globals().get(
                "to_" + self.gconf_typecast.get(k, "string"), None)
            if cast_func is not None:
                self.gconf[k] = cast_func(v)
                if self.default_values.get(k, None) is not None:
                    self.default_values[k] = cast_func(v)

    def reset(self, name):
        # If custom conf file is not set then it is only read only configs
        if self.custom_conf_file is None:
            raise GconfNotConfigurable()

        # If a config can not be modified
        if name != "all" and not self._is_configurable(name):
            raise GconfNotConfigurable()

        cnf = ConfigParser()
        with open(self.custom_conf_file) as f:
            cnf.readfp(f)

            # Nothing to Reset, Not configured
            if name != "all":
                if not cnf.has_option("vars", name):
                    return True

                # Remove option from custom conf file
                cnf.remove_option("vars", name)
            else:
                # Remove and add empty section, do not disturb if config file
                # already has any other section
                try:
                    cnf.remove_section("vars")
                except NoSectionError:
                    pass

                cnf.add_section("vars")

        with open(self.tmp_conf_file, "w") as fw:
            cnf.write(fw)

        os.rename(self.tmp_conf_file, self.custom_conf_file)

        self.reload()

        return True

    def set(self, name, value):
        if self.custom_conf_file is None:
            raise GconfNotConfigurable()

        if not self._is_configurable(name):
            raise GconfNotConfigurable()

        if not self._is_valid_value(name, value):
            raise GconfInvalidValue()

        curr_val = self.gconf.get(name, None)
        if curr_val == value:
            return True

        cnf = ConfigParser()
        with open(self.custom_conf_file) as f:
            cnf.readfp(f)

        if not cnf.has_section("vars"):
            cnf.add_section("vars")

        cnf.set("vars", name, value)
        with open(self.tmp_conf_file, "w") as fw:
            cnf.write(fw)

        os.rename(self.tmp_conf_file, self.custom_conf_file)

        self.reload()

        return True

    def check(self, name, value=None, with_conffile=True):
        if with_conffile and self.custom_conf_file is None:
            raise GconfNotConfigurable()

        if not self._is_configurable(name):
            raise GconfNotConfigurable()

        if value is not None and not self._is_valid_value(name, value):
            raise GconfInvalidValue()

    def _load(self):
        self.gconf = {}
        self.template_conf = []
        self.gconf_typecast = {}
        self.non_configurable_configs = []
        self.session_conf_items = []
        self.default_values = {}

        conf = ConfigParser()
        # Default Template config file
        with open(self.default_conf_file) as f:
            conf.readfp(f)

        # Custom Config file
        if self.custom_conf_file is not None:
            with open(self.custom_conf_file) as f:
                conf.readfp(f)

        # Get version from default conf file
        self.version = conf.get("__meta__", "version")

        # Populate default values
        for sect in conf.sections():
            if sect in ["__meta__", "vars"]:
                continue

            # Collect list of available options with help details
            self.gconfdata[sect] = {}
            for k, v in conf.items(sect):
                self.gconfdata[sect][k] = v.strip()

            # Collect the Type cast information
            if conf.has_option(sect, "type"):
                self.gconf_typecast[sect] = conf.get(sect, "type")

            # Prepare list of configurable conf
            if conf.has_option(sect, "configurable"):
                if conf.get(sect, "configurable").lower() == "false":
                    self.non_configurable_configs.append(sect)

            # if it is a template conf value which needs to be substituted
            if conf.has_option(sect, "template"):
                if conf.get(sect, "template").lower().strip() == "true":
                    self.template_conf.append(sect)

            # Set default values
            if conf.has_option(sect, "value"):
                self.gconf[sect] = conf.get(sect, "value").strip()

        # Load the custom conf elements and overwrite
        if conf.has_section("vars"):
            for k, v in conf.items("vars"):
                self.session_conf_items.append(k)
                self.default_values[k] = self.gconf.get(k, "")
                self.gconf[k] = v.strip()

        # Overwrite the Slave configurations which are sent as
        # arguments to gsyncd slave
        if self.override_from_args:
            for k, v in self.args.items():
                k = k.replace("_", "-")
                if k.startswith("slave-") and k in self.gconf:
                    self.gconf[k] = v

        self._tmpl_substitute()
        self._do_typecast()

    def reload(self):
        if self._is_config_changed():
            self._load()

    def get(self, name, default_value=None):
        return self.gconf.get(name, default_value)

    def getall(self, show_defaults=False, show_non_configurable=False):
        cnf = {}
        if not show_defaults:
            for k in self.session_conf_items:
                if k not in self.non_configurable_configs:
                    dv = self.default_values.get(k, "")
                    cnf[k] = {
                        "value": self.get(k),
                        "default": dv,
                        "configurable": True,
                        "modified": False if dv == "" else True
                    }
            return cnf

        # Show all configs including defaults
        for k, v in self.gconf.items():
            configurable = False if k in self.non_configurable_configs \
                           else True
            dv = self.default_values.get(k, "")
            modified = False if dv == "" else True
            if show_non_configurable:
                cnf[k] = {
                    "value": v,
                    "default": dv,
                    "configurable": configurable,
                    "modified": modified
                }
            else:
                if k not in self.non_configurable_configs:
                    cnf[k] = {
                        "value": v,
                        "default": dv,
                        "configurable": configurable,
                        "modified": modified
                    }

        return cnf

    def getr(self, name, default_value=None):
        self.reload()
        return self.get(name, default_value)

    def get_help(self, name=None):
        pass

    def _is_configurable(self, name):
        item = self.gconfdata.get(name, None)
        if item is None:
            return False

        return item.get("configurable", True)

    def _is_valid_value(self, name, value):
        item = self.gconfdata.get(name, None)
        if item is None:
            return False

        # If validation func not defined
        if item.get("validation", None) is None:
            return True

        # minmax validation
        if item["validation"] == "minmax":
            return validate_minmax(value, item["min"], item["max"])

        if item["validation"] == "choice":
            return validate_choice(value, item["allowed_values"])

        if item["validation"] == "bool":
            return validate_bool(value)

        if item["validation"] == "execpath":
            return validate_execpath(value)

        if item["validation"] == "unixtime":
            return validate_unixtime(value)

        return False

    def _is_config_changed(self):
        if self.custom_conf_file is not None and \
           os.path.exists(self.custom_conf_file):
                st = os.lstat(self.custom_conf_file)
                if st.st_mtime > self.prev_mtime:
                    self.prev_mtime = st.st_mtime
                    return True

        return False


def validate_unixtime(value):
    try:
        y = datetime.fromtimestamp(int(value)).strftime("%Y")
        if y == "1970":
            return False

        return True
    except ValueError:
        return False


def validate_minmax(value, minval, maxval):
    value = int(value)
    minval = int(minval)
    maxval = int(maxval)

    return value >= minval and value <= maxval


def validate_choice(value, allowed_values):
    allowed_values = allowed_values.split(",")
    allowed_values = [v.strip() for v in allowed_values]

    return value in allowed_values


def validate_bool(value):
    return value in ["true", "false"]


def validate_execpath(value):
    return os.path.isfile(value) and os.access(value, os.X_OK)


def validate_filepath(value):
    return os.path.isfile(value)


def validate_path(value):
    return os.path.exists(value)


def to_int(value):
    return int(value)


def to_float(value):
    return float(value)


def to_bool(value):
    if isinstance(value, bool):
        return value
    return True if value in ["true", "True"] else False


def get(name, default_value=None):
    return _gconf.get(name, default_value)


def getall(show_defaults=False, show_non_configurable=False):
    return _gconf.getall(show_defaults=show_defaults,
                         show_non_configurable=show_non_configurable)


def getr(name, default_value=None):
    return _gconf.getr(name, default_value)


def load(default_conf, custom_conf=None, args={}, extra_tmpl_args={},
         override_from_args=False):
    global _gconf
    _gconf = Gconf(default_conf, custom_conf, args, extra_tmpl_args,
                   override_from_args)


def setconfig(name, value):
    global _gconf
    _gconf.set(name, value)


def resetconfig(name):
    global _gconf
    _gconf.reset(name)


def check(name, value=None, with_conffile=True):
    global _gconf
    _gconf.check(name, value=value, with_conffile=with_conffile)