blob: f3b2a2a614737a485918104bef71fc3881248167 (
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
|
# frozen_string_literal: true
module Database
module DatabaseHelpers
# In order to directly work with views using factories,
# we can swapout the view for a table of identical structure.
def swapout_view_for_table(view, connection: nil)
connection ||= ActiveRecord::Base.connection
connection.execute(<<~SQL.squish)
CREATE TABLE #{view}_copy (LIKE #{view});
DROP VIEW #{view};
ALTER TABLE #{view}_copy RENAME TO #{view};
SQL
end
# Set statement timeout temporarily.
# Useful when testing query timeouts.
#
# Note that this method cannot restore the timeout if a query
# was canceled due to e.g. a statement timeout.
# Refrain from using this transaction in these situations.
#
# @param timeout - Statement timeout in seconds
#
# Example:
#
# with_statement_timeout(0.1) do
# model.select('pg_sleep(0.11)')
# end
def with_statement_timeout(timeout)
# Force a positive value and a minimum of 1ms for very small values.
timeout = (timeout * 1000).abs.ceil
raise ArgumentError, 'Using a timeout of `0` means to disable statement timeout.' if timeout == 0
previous_timeout = ActiveRecord::Base.connection
.exec_query('SHOW statement_timeout')[0].fetch('statement_timeout')
set_statement_timeout("#{timeout}ms")
yield
ensure
begin
set_statement_timeout(previous_timeout)
rescue ActiveRecord::StatementInvalid
# After a transaction was canceled/aborted due to e.g. a statement
# timeout commands are ignored and will raise in PG::InFailedSqlTransaction.
# We can safely ignore this error because the statement timeout was set
# for the currrent transaction which will be closed anyway.
end
end
# Set statement timeout for the current transaction.
#
# Note, that it does not restore the previous statement timeout.
# Use `with_statement_timeout` instead.
#
# @param timeout - Statement timeout in seconds
#
# Example:
#
# set_statement_timeout(0.1)
# model.select('pg_sleep(0.11)')
def set_statement_timeout(timeout)
ActiveRecord::Base.connection.execute(
format(%(SET LOCAL statement_timeout = '%s'), timeout)
)
end
end
end
|
