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
|
# frozen_string_literal: true
require 'fast_spec_helper'
RSpec.describe Gitlab::Metrics::Sli do
let(:prometheus) { double("prometheus") }
before do
stub_const("Gitlab::Metrics", prometheus)
end
describe 'Class methods' do
it 'does not allow them to be called on the parent module' do
expect(described_class).not_to respond_to(:[])
expect(described_class).not_to respond_to(:initialize_sli)
end
it 'allows different SLIs to be defined on each subclass' do
apdex_counters = [
fake_total_counter('foo', 'apdex'),
fake_numerator_counter('foo', 'apdex', 'success')
]
error_rate_counters = [
fake_total_counter('foo', 'error_rate'),
fake_numerator_counter('foo', 'error_rate', 'error')
]
apdex = described_class::Apdex.initialize_sli(:foo, [{ hello: :world }])
expect(apdex_counters).to all(have_received(:get).with(hello: :world))
error_rate = described_class::ErrorRate.initialize_sli(:foo, [{ other: :labels }])
expect(error_rate_counters).to all(have_received(:get).with(other: :labels))
expect(described_class::Apdex[:foo]).to be(apdex)
expect(described_class::ErrorRate[:foo]).to be(error_rate)
end
end
subclasses = {
Gitlab::Metrics::Sli::Apdex => :success,
Gitlab::Metrics::Sli::ErrorRate => :error
}
subclasses.each do |subclass, numerator_type|
subclass_type = subclass.to_s.demodulize.underscore
describe subclass do
describe 'Class methods' do
before do
described_class.instance_variable_set(:@known_slis, nil)
end
describe '.[]' do
it 'returns and stores a new, uninitialized SLI' do
sli = described_class[:bar]
expect(described_class[:bar]).to be(sli)
expect(described_class[:bar]).not_to be_initialized
end
it 'returns the same object for multiple accesses' do
sli = described_class.initialize_sli(:huzzah, [])
2.times do
expect(described_class[:huzzah]).to be(sli)
end
end
end
describe '.initialize_sli' do
it 'returns and stores a new initialized SLI' do
counters = [
fake_total_counter(:bar, subclass_type),
fake_numerator_counter(:bar, subclass_type, numerator_type)
]
sli = described_class.initialize_sli(:bar, [{ hello: :world }])
expect(sli).to be_initialized
expect(counters).to all(have_received(:get).with(hello: :world))
expect(counters).to all(have_received(:get).with(hello: :world))
end
it 'does not change labels for an already-initialized SLI' do
counters = [
fake_total_counter(:bar, subclass_type),
fake_numerator_counter(:bar, subclass_type, numerator_type)
]
sli = described_class.initialize_sli(:bar, [{ hello: :world }])
expect(sli).to be_initialized
expect(counters).to all(have_received(:get).with(hello: :world))
expect(counters).to all(have_received(:get).with(hello: :world))
counters.each do |counter|
expect(counter).not_to receive(:get)
end
expect(described_class.initialize_sli(:bar, [{ other: :labels }])).to eq(sli)
end
end
describe '.initialized?' do
before do
fake_total_counter(:boom, subclass_type)
fake_numerator_counter(:boom, subclass_type, numerator_type)
end
it 'is true when an SLI was initialized with labels' do
expect { described_class.initialize_sli(:boom, [{ hello: :world }]) }
.to change { described_class.initialized?(:boom) }.from(false).to(true)
end
it 'is false when an SLI was not initialized with labels' do
expect { described_class.initialize_sli(:boom, []) }
.not_to change { described_class.initialized?(:boom) }.from(false)
end
end
end
describe '#initialize_counters' do
it 'initializes counters for the passed label combinations' do
counters = [
fake_total_counter(:hey, subclass_type),
fake_numerator_counter(:hey, subclass_type, numerator_type)
]
described_class.new(:hey).initialize_counters([{ foo: 'bar' }, { foo: 'baz' }])
expect(counters).to all(have_received(:get).with({ foo: 'bar' }))
expect(counters).to all(have_received(:get).with({ foo: 'baz' }))
end
end
describe "#increment" do
let!(:sli) { described_class.new(:heyo) }
let!(:total_counter) { fake_total_counter(:heyo, subclass_type) }
let!(:numerator_counter) { fake_numerator_counter(:heyo, subclass_type, numerator_type) }
it "increments both counters for labels when #{numerator_type} is true" do
sli.increment(labels: { hello: "world" }, numerator_type => true)
expect(total_counter).to have_received(:increment).with({ hello: 'world' })
expect(numerator_counter).to have_received(:increment).with({ hello: 'world' })
end
it "only increments the total counters for labels when #{numerator_type} is false" do
sli.increment(labels: { hello: "world" }, numerator_type => false)
expect(total_counter).to have_received(:increment).with({ hello: 'world' })
expect(numerator_counter).not_to have_received(:increment).with({ hello: 'world' })
end
end
end
end
def fake_prometheus_counter(name)
fake_counter = double("prometheus counter: #{name}")
allow(fake_counter).to receive(:get)
allow(fake_counter).to receive(:increment)
allow(prometheus).to receive(:counter).with(name.to_sym, anything).and_return(fake_counter)
fake_counter
end
def fake_total_counter(name, type)
fake_prometheus_counter("gitlab_sli:#{name}_#{type}:total")
end
def fake_numerator_counter(name, type, numerator_name)
fake_prometheus_counter("gitlab_sli:#{name}_#{type}:#{numerator_name}_total")
end
end
|