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
|
# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
class TransactionState
VALID_STATES = Set.new([:committed, :rolledback, nil])
def initialize(state = nil)
@state = state
end
def finalized?
@state
end
def committed?
@state == :committed
end
def rolledback?
@state == :rolledback
end
def completed?
committed? || rolledback?
end
def set_state(state)
unless VALID_STATES.include?(state)
raise ArgumentError, "Invalid transaction state: #{state}"
end
@state = state
end
end
class NullTransaction #:nodoc:
def initialize; end
def state; end
def closed?; true; end
def open?; false; end
def joinable?; false; end
def add_record(record); end
end
class Transaction #:nodoc:
attr_reader :connection, :state, :records, :savepoint_name
attr_writer :joinable
def initialize(connection, options, run_commit_callbacks: false)
@connection = connection
@state = TransactionState.new
@records = []
@joinable = options.fetch(:joinable, true)
@run_commit_callbacks = run_commit_callbacks
end
def add_record(record)
records << record
end
def rollback
@state.set_state(:rolledback)
end
def rollback_records
ite = records.uniq
while record = ite.shift
record.rolledback!(force_restore_state: full_rollback?)
end
ensure
ite.each do |i|
i.rolledback!(force_restore_state: full_rollback?, should_run_callbacks: false)
end
end
def commit
@state.set_state(:committed)
end
def before_commit_records
records.uniq.each(&:before_committed!) if @run_commit_callbacks
end
def commit_records
ite = records.uniq
while record = ite.shift
if @run_commit_callbacks
record.committed!
else
# if not running callbacks, only adds the record to the parent transaction
record.add_to_transaction
end
end
ensure
ite.each { |i| i.committed!(should_run_callbacks: false) }
end
def full_rollback?; true; end
def joinable?; @joinable; end
def closed?; false; end
def open?; !closed?; end
end
class SavepointTransaction < Transaction
def initialize(connection, savepoint_name, options, *args)
super(connection, options, *args)
if options[:isolation]
raise ActiveRecord::TransactionIsolationError, "cannot set transaction isolation in a nested transaction"
end
connection.create_savepoint(@savepoint_name = savepoint_name)
end
def rollback
connection.rollback_to_savepoint(savepoint_name)
super
end
def commit
connection.release_savepoint(savepoint_name)
super
end
def full_rollback?; false; end
end
class RealTransaction < Transaction
def initialize(connection, options, *args)
super
if options[:isolation]
connection.begin_isolated_db_transaction(options[:isolation])
else
connection.begin_db_transaction
end
end
def rollback
connection.rollback_db_transaction
super
end
def commit
connection.commit_db_transaction
super
end
end
class TransactionManager #:nodoc:
def initialize(connection)
@stack = []
@connection = connection
end
def begin_transaction(options = {})
@connection.lock.synchronize do
run_commit_callbacks = !current_transaction.joinable?
transaction =
if @stack.empty?
RealTransaction.new(@connection, options, run_commit_callbacks: run_commit_callbacks)
else
SavepointTransaction.new(@connection, "active_record_#{@stack.size}", options,
run_commit_callbacks: run_commit_callbacks)
end
@stack.push(transaction)
transaction
end
end
def commit_transaction
@connection.lock.synchronize do
transaction = @stack.last
begin
transaction.before_commit_records
ensure
@stack.pop
end
transaction.commit
transaction.commit_records
end
end
def rollback_transaction(transaction = nil)
@connection.lock.synchronize do
transaction ||= @stack.pop
transaction.rollback
transaction.rollback_records
end
end
def within_new_transaction(options = {})
@connection.lock.synchronize do
begin
transaction = begin_transaction options
yield
rescue Exception => error
if transaction
rollback_transaction
after_failure_actions(transaction, error)
end
raise
ensure
unless error
if Thread.current.status == "aborting"
rollback_transaction if transaction
else
begin
commit_transaction
rescue Exception
rollback_transaction(transaction) unless transaction.state.completed?
raise
end
end
end
end
end
end
def open_transactions
@stack.size
end
def current_transaction
@stack.last || NULL_TRANSACTION
end
private
NULL_TRANSACTION = NullTransaction.new
# Deallocate invalidated prepared statements outside of the transaction
def after_failure_actions(transaction, error)
return unless transaction.is_a?(RealTransaction)
return unless error.is_a?(ActiveRecord::PreparedStatementCacheExpired)
@connection.clear_cache!
end
end
end
end
|
