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
|
require 'active_support/lazy_load_hooks'
module ActiveRecord
module Explain
def self.extended(base)
base.mattr_accessor :auto_explain_threshold_in_seconds, instance_accessor: false
end
# If auto explain is enabled, this method triggers EXPLAIN logging for the
# queries triggered by the block if it takes more than the threshold as a
# whole. That is, the threshold is not checked against each individual
# query, but against the duration of the entire block. This approach is
# convenient for relations.
#
# The available_queries_for_explain thread variable collects the queries
# to be explained. If the value is nil, it means queries are not being
# currently collected. A false value indicates collecting is turned
# off. Otherwise it is an array of queries.
def logging_query_plan # :nodoc:
return yield unless logger
threshold = auto_explain_threshold_in_seconds
current = Thread.current
if threshold && current[:available_queries_for_explain].nil?
begin
queries = current[:available_queries_for_explain] = []
start = Time.now
result = yield
logger.warn(exec_explain(queries)) if Time.now - start > threshold
result
ensure
current[:available_queries_for_explain] = nil
end
else
yield
end
end
# Relation#explain needs to be able to collect the queries regardless of
# whether auto explain is enabled. This method serves that purpose.
def collecting_queries_for_explain # :nodoc:
current = Thread.current
original, current[:available_queries_for_explain] = current[:available_queries_for_explain], []
return yield, current[:available_queries_for_explain]
ensure
# Note that the return value above does not depend on this assigment.
current[:available_queries_for_explain] = original
end
# Makes the adapter execute EXPLAIN for the tuples of queries and bindings.
# Returns a formatted string ready to be logged.
def exec_explain(queries) # :nodoc:
str = queries && queries.map do |sql, bind|
[].tap do |msg|
msg << "EXPLAIN for: #{sql}"
unless bind.empty?
bind_msg = bind.map {|col, val| [col.name, val]}.inspect
msg.last << " #{bind_msg}"
end
msg << connection.explain(sql, bind)
end.join("\n")
end.join("\n")
# Overriding inspect to be more human readable, specially in the console.
def str.inspect
self
end
str
end
# Silences automatic EXPLAIN logging for the duration of the block.
#
# This has high priority, no EXPLAINs will be run even if downwards
# the threshold is set to 0.
#
# As the name of the method suggests this only applies to automatic
# EXPLAINs, manual calls to <tt>ActiveRecord::Relation#explain</tt> run.
def silence_auto_explain
current = Thread.current
original, current[:available_queries_for_explain] = current[:available_queries_for_explain], false
yield
ensure
current[:available_queries_for_explain] = original
end
end
end
|
