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
600
601
602
603
604
605
606
607
|
#--
# Author:: Adam Jacob (<adam@chef.io>)
# Author:: AJ Christensen (<aj@chef.io>)
# Copyright:: Copyright 2008-2016, Chef Software, Inc.
# License:: Apache License, Version 2.0
#
# 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.
#
require "chef/node/mixin/deep_merge_cache"
require "chef/node/mixin/immutablize_hash"
require "chef/node/mixin/state_tracking"
require "chef/node/immutable_collections"
require "chef/node/attribute_collections"
require "chef/decorator/unchain"
require "chef/mixin/deep_merge"
require "chef/log"
class Chef
class Node
# == Attribute
# Attribute implements a nested key-value (Hash) and flat collection
# (Array) data structure supporting multiple levels of precedence, such
# that a given key may have multiple values internally, but will only
# return the highest precedence value when reading.
class Attribute < Mash
include Immutablize
# FIXME: what is include Enumerable doing up here, when down below we delegate
# most of the Enumerable/Hash things to the underlying merged ImmutableHash. That
# is, in fact, the correct, thing to do, while including Enumerable to try to create
# a hash-like API gets lots of things wrong because of the difference between the
# Hash `each do |key, value|` vs the Array-like `each do |value|` API that Enumerable
# expects. This include should probably be deleted?
include Enumerable
include Chef::Node::Mixin::DeepMergeCache
include Chef::Node::Mixin::StateTracking
include Chef::Node::Mixin::ImmutablizeHash
# List of the component attribute hashes, in order of precedence, low to
# high.
COMPONENTS = [
:@default,
:@env_default,
:@role_default,
:@force_default,
:@normal,
:@override,
:@role_override,
:@env_override,
:@force_override,
:@automatic,
].freeze
DEFAULT_COMPONENTS = [
:@default,
:@env_default,
:@role_default,
:@force_default,
]
OVERRIDE_COMPONENTS = [
:@override,
:@role_override,
:@env_override,
:@force_override,
]
[:all?,
:any?,
:assoc,
:chunk,
:collect,
:collect_concat,
:compare_by_identity,
:compare_by_identity?,
:count,
:cycle,
:detect,
:drop,
:drop_while,
:each,
:each_cons,
:each_entry,
:each_key,
:each_pair,
:each_slice,
:each_value,
:each_with_index,
:each_with_object,
:empty?,
:entries,
:except,
:fetch,
:find,
:find_all,
:find_index,
:first,
:flat_map,
:flatten,
:grep,
:group_by,
:has_value?,
:include?,
:index,
:inject,
:invert,
:key,
:keys,
:length,
:map,
:max,
:max_by,
:merge,
:min,
:min_by,
:minmax,
:minmax_by,
:none?,
:one?,
:partition,
:rassoc,
:reduce,
:reject,
:reverse_each,
:select,
:size,
:slice_before,
:sort,
:sort_by,
:store,
:symbolize_keys,
:take,
:take_while,
:to_a,
:to_h,
:to_hash,
:to_set,
:value?,
:values,
:values_at,
:zip].each do |delegated_method|
define_method(delegated_method) do |*args, &block|
merged_attributes.send(delegated_method, *args, &block)
end
end
# return the cookbook level default attribute component
attr_reader :default
# return the role level default attribute component
attr_reader :role_default
# return the environment level default attribute component
attr_reader :env_default
# return the force_default level attribute component
attr_reader :force_default
# return the "normal" level attribute component
attr_reader :normal
# return the cookbook level override attribute component
attr_reader :override
# return the role level override attribute component
attr_reader :role_override
# return the enviroment level override attribute component
attr_reader :env_override
# return the force override level attribute component
attr_reader :force_override
# return the automatic level attribute component
attr_reader :automatic
def initialize(normal, default, override, automatic)
@default = VividMash.new(default, self)
@env_default = VividMash.new({}, self)
@role_default = VividMash.new({}, self)
@force_default = VividMash.new({}, self)
@normal = VividMash.new(normal, self)
@override = VividMash.new(override, self)
@role_override = VividMash.new({}, self)
@env_override = VividMash.new({}, self)
@force_override = VividMash.new({}, self)
@automatic = VividMash.new(automatic, self)
super()
end
# Debug what's going on with an attribute. +args+ is a path spec to the
# attribute you're interested in. For example, to debug where the value
# of `node[:network][:default_interface]` is coming from, use:
# debug_value(:network, :default_interface).
# The return value is an Array of Arrays. The Arrays
# are pairs of `["precedence_level", value]`, where precedence level is
# the component, such as role default, normal, etc. and value is the
# attribute value set at that precedence level. If there is no value at
# that precedence level, +value+ will be the symbol +:not_present+.
def debug_value(*args)
COMPONENTS.map do |component|
ivar = instance_variable_get(component)
value = args.inject(ivar) do |so_far, key|
if so_far == :not_present
:not_present
elsif so_far.has_key?(key)
so_far[key]
else
:not_present
end
end
[component.to_s.sub(/^@/, ""), value]
end
end
# Set the cookbook level default attribute component to +new_data+.
def default=(new_data)
reset
@default = VividMash.new(new_data, self)
end
# Set the role level default attribute component to +new_data+
def role_default=(new_data)
reset
@role_default = VividMash.new(new_data, self)
end
# Set the environment level default attribute component to +new_data+
def env_default=(new_data)
reset
@env_default = VividMash.new(new_data, self)
end
# Set the force_default (+default!+) level attributes to +new_data+
def force_default=(new_data)
reset
@force_default = VividMash.new(new_data, self)
end
# Set the normal level attribute component to +new_data+
def normal=(new_data)
reset
@normal = VividMash.new(new_data, self)
end
# Set the cookbook level override attribute component to +new_data+
def override=(new_data)
reset
@override = VividMash.new(new_data, self)
end
# Set the role level override attribute component to +new_data+
def role_override=(new_data)
reset
@role_override = VividMash.new(new_data, self)
end
# Set the environment level override attribute component to +new_data+
def env_override=(new_data)
reset
@env_override = VividMash.new(new_data, self)
end
def force_override=(new_data)
reset
@force_override = VividMash.new(new_data, self)
end
def automatic=(new_data)
reset
@automatic = VividMash.new(new_data, self)
end
#
# Deleting attributes
#
# clears attributes from all precedence levels
def rm(*args)
with_deep_merged_return_value(self, *args) do
rm_default(*args)
rm_normal(*args)
rm_override(*args)
end
end
# clears attributes from all default precedence levels
#
# similar to: force_default!['foo']['bar'].delete('baz')
# - does not autovivify
# - does not trainwreck if interior keys do not exist
def rm_default(*args)
with_deep_merged_return_value(combined_default, *args) do
default.unlink(*args)
role_default.unlink(*args)
env_default.unlink(*args)
force_default.unlink(*args)
end
end
# clears attributes from normal precedence
#
# equivalent to: normal!['foo']['bar'].delete('baz')
# - does not autovivify
# - does not trainwreck if interior keys do not exist
def rm_normal(*args)
normal.unlink(*args)
end
# clears attributes from all override precedence levels
#
# equivalent to: force_override!['foo']['bar'].delete('baz')
# - does not autovivify
# - does not trainwreck if interior keys do not exist
def rm_override(*args)
with_deep_merged_return_value(combined_override, *args) do
override.unlink(*args)
role_override.unlink(*args)
env_override.unlink(*args)
force_override.unlink(*args)
end
end
def with_deep_merged_return_value(obj, *path, last)
hash = obj.read(*path)
return nil unless hash.is_a?(Hash)
ret = hash[last]
yield
ret
end
private :with_deep_merged_return_value
#
# Replacing attributes without merging
#
# sets default attributes without merging
#
# - this API autovivifies (and cannot trainwreck)
def default!(*args)
return Decorator::Unchain.new(self, :default!) unless args.length > 0
write(:default, *args)
end
# sets normal attributes without merging
#
# - this API autovivifies (and cannot trainwreck)
def normal!(*args)
return Decorator::Unchain.new(self, :normal!) unless args.length > 0
write(:normal, *args)
end
# sets override attributes without merging
#
# - this API autovivifies (and cannot trainwreck)
def override!(*args)
return Decorator::Unchain.new(self, :override!) unless args.length > 0
write(:override, *args)
end
# clears from all default precedence levels and then sets force_default
#
# - this API autovivifies (and cannot trainwreck)
def force_default!(*args)
return Decorator::Unchain.new(self, :force_default!) unless args.length > 0
value = args.pop
rm_default(*args)
write(:force_default, *args, value)
end
# clears from all override precedence levels and then sets force_override
def force_override!(*args)
return Decorator::Unchain.new(self, :force_override!) unless args.length > 0
value = args.pop
rm_override(*args)
write(:force_override, *args, value)
end
#
# Accessing merged attributes.
#
# Note that merged_attributes('foo', 'bar', 'baz') can be called to compute only the
# deep merge of node['foo']['bar']['baz'], but in practice we currently always compute
# all of node['foo'] even if the user only requires node['foo']['bar']['baz'].
#
def merged_attributes(*path)
immutablize(merge_all(path))
end
def combined_override(*path)
immutablize(merge_overrides(path))
end
def combined_default(*path)
immutablize(merge_defaults(path))
end
def normal_unless(*args)
return Decorator::Unchain.new(self, :normal_unless) unless args.length > 0
write(:normal, *args) if read(*args[0...-1]).nil?
end
def default_unless(*args)
return Decorator::Unchain.new(self, :default_unless) unless args.length > 0
write(:default, *args) if read(*args[0...-1]).nil?
end
def override_unless(*args)
return Decorator::Unchain.new(self, :override_unless) unless args.length > 0
write(:override, *args) if read(*args[0...-1]).nil?
end
def set_unless(*args)
Chef.log_deprecation("node.set_unless is deprecated and will be removed in Chef 14, please use node.default_unless/node.override_unless (or node.normal_unless if you really need persistence)")
return Decorator::Unchain.new(self, :default_unless) unless args.length > 0
write(:normal, *args) if read(*args[0...-1]).nil?
end
def has_key?(key)
COMPONENTS.any? do |component_ivar|
instance_variable_get(component_ivar).has_key?(key)
end
end
# method-style access to attributes (has to come after the prepended ImmutablizeHash)
def read(*path)
merged_attributes.read(*path)
end
def read!(*path)
merged_attributes.read!(*path)
end
def exist?(*path)
merged_attributes.exist?(*path)
end
def write(level, *args, &block)
self.send(level).write(*args, &block)
end
def write!(level, *args, &block)
self.send(level).write!(*args, &block)
end
def unlink(level, *path)
self.send(level).unlink(*path)
end
def unlink!(level, *path)
self.send(level).unlink!(*path)
end
alias :attribute? :has_key?
alias :member? :has_key?
alias :include? :has_key?
alias :key? :has_key?
alias :each_attribute :each
def method_missing(symbol, *args)
if symbol == :to_ary
merged_attributes.send(symbol, *args)
elsif args.empty?
Chef.log_deprecation %q{method access to node attributes (node.foo.bar) is deprecated and will be removed in Chef 13, please use bracket syntax (node["foo"]["bar"])}
if key?(symbol)
self[symbol]
else
raise NoMethodError, "Undefined method or attribute `#{symbol}' on `node'"
end
elsif symbol.to_s =~ /=$/
Chef.log_deprecation %q{method setting of node attributes (node.foo="bar") is deprecated and will be removed in Chef 13, please use bracket syntax (node["foo"]="bar")}
key_to_set = symbol.to_s[/^(.+)=$/, 1]
self[key_to_set] = (args.length == 1 ? args[0] : args)
else
raise NoMethodError, "Undefined node attribute or method `#{symbol}' on `node'"
end
end
def to_s
merged_attributes.to_s
end
def inspect
"#<#{self.class} " << (COMPONENTS + [:@merged_attributes, :@properties]).map do |iv|
"#{iv}=#{instance_variable_get(iv).inspect}"
end.join(", ") << ">"
end
private
# Helper method for merge_all/merge_defaults/merge_overrides.
#
# apply_path(thing, [ "foo", "bar", "baz" ]) = thing["foo"]["bar"]["baz"]
#
# The path value can be nil in which case the whole component is returned.
#
# It returns nil (does not raise an exception) if it walks off the end of an Mash/Hash/Array, it does not
# raise any TypeError if it attempts to apply a hash key to an Integer/String/TrueClass, and just returns
# nil in that case.
#
def apply_path(component, path)
path ||= []
path.inject(component) do |val, path_arg|
if val.respond_to?(:[])
# Have an Array-like or Hash-like thing
if !val.respond_to?(:has_key?)
# Have an Array-like thing
val[path_arg]
elsif val.has_key?(path_arg)
# Hash-like thing (must check has_key? first to protect against Autovivification)
val[path_arg]
else
nil
end
else
nil
end
end
end
# For elements like Fixnums, true, nil...
def safe_dup(e)
e.dup
rescue TypeError
e
end
# Deep merge all attribute levels using hash-only merging between different precidence
# levels (so override arrays completely replace arrays set at any default level).
#
# The path allows for selectively deep-merging a subtree of the node object.
#
# @param path [Array] Array of args to method chain to descend into the node object
# @return [attr] Deep Merged values (may be VividMash, Hash, Array, etc) from the node object
def merge_all(path)
components = [
merge_defaults(path),
apply_path(@normal, path),
merge_overrides(path),
apply_path(@automatic, path),
]
components.map! do |component|
safe_dup(component)
end
return nil if components.compact.empty?
components.inject(ImmutableMash.new({}, self)) do |merged, component|
Chef::Mixin::DeepMerge.hash_only_merge!(merged, component)
end
end
# Deep merge the default attribute levels with array merging.
#
# The path allows for selectively deep-merging a subtree of the node object.
#
# @param path [Array] Array of args to method chain to descend into the node object
# @return [attr] Deep Merged values (may be VividMash, Hash, Array, etc) from the node object
def merge_defaults(path)
DEFAULT_COMPONENTS.inject(nil) do |merged, component_ivar|
component_value = apply_path(instance_variable_get(component_ivar), path)
Chef::Mixin::DeepMerge.deep_merge(component_value, merged)
end
end
# Deep merge the override attribute levels with array merging.
#
# The path allows for selectively deep-merging a subtree of the node object.
#
# @param path [Array] Array of args to method chain to descend into the node object
# @return [attr] Deep Merged values (may be VividMash, Hash, Array, etc) from the node object
def merge_overrides(path)
OVERRIDE_COMPONENTS.inject(nil) do |merged, component_ivar|
component_value = apply_path(instance_variable_get(component_ivar), path)
Chef::Mixin::DeepMerge.deep_merge(component_value, merged)
end
end
# needed for __path
def convert_key(key)
key.kind_of?(Symbol) ? key.to_s : key
end
end
end
end
|