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
|
# frozen_string_literal: true
require 'spec_helper'
RSpec.shared_examples_for CounterAttribute do |counter_attributes|
it 'defines a Redis counter_key' do
expect(model.counter_key(:counter_name))
.to eq("project:{#{model.project_id}}:counters:CounterAttributeModel:#{model.id}:counter_name")
end
it 'defines a method to store counters' do
expect(model.class.counter_attributes.to_a).to eq(counter_attributes)
end
counter_attributes.each do |attribute|
describe attribute do
describe '#delayed_increment_counter', :redis do
let(:increment) { 10 }
subject { model.delayed_increment_counter(attribute, increment) }
context 'when attribute is a counter attribute' do
where(:increment) { [10, -3] }
with_them do
it 'increments the counter in Redis' do
subject
Gitlab::Redis::SharedState.with do |redis|
counter = redis.get(model.counter_key(attribute))
expect(counter).to eq(increment.to_s)
end
end
it 'does not increment the counter for the record' do
expect { subject }.not_to change { model.reset.read_attribute(attribute) }
end
it 'schedules a worker to flush counter increments asynchronously' do
expect(FlushCounterIncrementsWorker).to receive(:perform_in)
.with(CounterAttribute::WORKER_DELAY, model.class.name, model.id, attribute)
.and_call_original
subject
end
end
context 'when increment is 0' do
let(:increment) { 0 }
it 'does nothing' do
expect(FlushCounterIncrementsWorker).not_to receive(:perform_in)
expect(model).not_to receive(:update!)
subject
end
end
end
context 'when attribute is not a counter attribute' do
it 'delegates to ActiveRecord update!' do
expect { model.delayed_increment_counter(:unknown_attribute, 10) }
.to raise_error(ActiveModel::MissingAttributeError)
end
end
context 'when feature flag is disabled' do
before do
stub_feature_flags(efficient_counter_attribute: false)
end
it 'delegates to ActiveRecord update!' do
expect { subject }
.to change { model.reset.read_attribute(attribute) }.by(increment)
end
it 'does not increment the counter in Redis' do
subject
Gitlab::Redis::SharedState.with do |redis|
counter = redis.get(model.counter_key(attribute))
expect(counter).to be_nil
end
end
end
end
end
end
describe '.flush_increments_to_database!', :redis do
let(:incremented_attribute) { counter_attributes.first }
subject { model.flush_increments_to_database!(incremented_attribute) }
it 'obtains an exclusive lease during processing' do
expect(model)
.to receive(:in_lock)
.with(model.counter_lock_key(incremented_attribute), ttl: described_class::WORKER_LOCK_TTL)
.and_call_original
subject
end
context 'when there is a counter to flush' do
before do
model.delayed_increment_counter(incremented_attribute, 10)
model.delayed_increment_counter(incremented_attribute, -3)
end
it 'updates the record' do
expect { subject }.to change { model.reset.read_attribute(incremented_attribute) }.by(7)
end
it 'removes the increment entry from Redis' do
Gitlab::Redis::SharedState.with do |redis|
key_exists = redis.exists(model.counter_key(incremented_attribute))
expect(key_exists).to be_truthy
end
subject
Gitlab::Redis::SharedState.with do |redis|
key_exists = redis.exists(model.counter_key(incremented_attribute))
expect(key_exists).to be_falsey
end
end
end
context 'when there are no counters to flush' do
context 'when there are no counters in the relative :flushed key' do
it 'does not change the record' do
expect { subject }.not_to change { model.reset.attributes }
end
end
# This can be the case where updating counters in the database fails with error
# and retrying the worker will retry flushing the counters but the main key has
# disappeared and the increment has been moved to the "<...>:flushed" key.
context 'when there are counters in the relative :flushed key' do
before do
Gitlab::Redis::SharedState.with do |redis|
redis.incrby(model.counter_flushed_key(incremented_attribute), 10)
end
end
it 'updates the record' do
expect { subject }.to change { model.reset.read_attribute(incremented_attribute) }.by(10)
end
it 'deletes the relative :flushed key' do
subject
Gitlab::Redis::SharedState.with do |redis|
key_exists = redis.exists(model.counter_flushed_key(incremented_attribute))
expect(key_exists).to be_falsey
end
end
end
end
context 'when deleting :flushed key fails' do
before do
Gitlab::Redis::SharedState.with do |redis|
redis.incrby(model.counter_flushed_key(incremented_attribute), 10)
expect(redis).to receive(:del).and_raise('could not delete key')
end
end
it 'does a rollback of the counter update' do
expect { subject }.to raise_error('could not delete key')
expect(model.reset.read_attribute(incremented_attribute)).to eq(0)
end
end
end
end
|