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| 1 | +package cloudwatch |
| 2 | + |
| 3 | +import ( |
| 4 | + "errors" |
| 5 | + "testing" |
| 6 | + |
| 7 | + "sync" |
| 8 | + |
| 9 | + "fmt" |
| 10 | + |
| 11 | + "github.com/aws/aws-sdk-go/service/cloudwatch" |
| 12 | + "github.com/aws/aws-sdk-go/service/cloudwatch/cloudwatchiface" |
| 13 | + "github.com/go-kit/kit/log" |
| 14 | + "github.com/go-kit/kit/metrics/teststat" |
| 15 | +) |
| 16 | + |
| 17 | +type mockCloudWatch struct { |
| 18 | + cloudwatchiface.CloudWatchAPI |
| 19 | + mtx sync.RWMutex |
| 20 | + valuesReceived map[string]float64 |
| 21 | + dimensionsReceived map[string][]*cloudwatch.Dimension |
| 22 | +} |
| 23 | + |
| 24 | +func newMockCloudWatch() *mockCloudWatch { |
| 25 | + return &mockCloudWatch{ |
| 26 | + valuesReceived: map[string]float64{}, |
| 27 | + dimensionsReceived: map[string][]*cloudwatch.Dimension{}, |
| 28 | + } |
| 29 | +} |
| 30 | + |
| 31 | +func (mcw *mockCloudWatch) PutMetricData(input *cloudwatch.PutMetricDataInput) (*cloudwatch.PutMetricDataOutput, error) { |
| 32 | + mcw.mtx.Lock() |
| 33 | + defer mcw.mtx.Unlock() |
| 34 | + for _, datum := range input.MetricData { |
| 35 | + mcw.valuesReceived[*datum.MetricName] = *datum.Value |
| 36 | + mcw.dimensionsReceived[*datum.MetricName] = datum.Dimensions |
| 37 | + } |
| 38 | + return nil, nil |
| 39 | +} |
| 40 | + |
| 41 | +func testDimensions(svc *mockCloudWatch, name string, labelValues ...string) error { |
| 42 | + dimensions, ok := svc.dimensionsReceived[name] |
| 43 | + if !ok { |
| 44 | + if len(labelValues) > 0 { |
| 45 | + return errors.New("Expected dimensions to be available, but none were") |
| 46 | + } |
| 47 | + } |
| 48 | +LabelValues: |
| 49 | + for i, j := 0, 0; i < len(labelValues); i, j = i+2, j+1 { |
| 50 | + name, value := labelValues[i], labelValues[i+1] |
| 51 | + for _, dimension := range dimensions { |
| 52 | + if *dimension.Name == name { |
| 53 | + if *dimension.Value == value { |
| 54 | + break LabelValues |
| 55 | + } |
| 56 | + } |
| 57 | + } |
| 58 | + return fmt.Errorf("Could not find dimension with name %s and value %s", name, value) |
| 59 | + } |
| 60 | + |
| 61 | + return nil |
| 62 | +} |
| 63 | + |
| 64 | +func TestCounter(t *testing.T) { |
| 65 | + namespace, name := "abc", "def" |
| 66 | + label, value := "label", "value" |
| 67 | + svc := newMockCloudWatch() |
| 68 | + cw := New(namespace, log.NewNopLogger(), svc) |
| 69 | + counter := cw.NewCounter(name).With(label, value) |
| 70 | + valuef := func() float64 { |
| 71 | + err := cw.Send() |
| 72 | + if err != nil { |
| 73 | + t.Fatal(err) |
| 74 | + } |
| 75 | + svc.mtx.RLock() |
| 76 | + defer svc.mtx.RUnlock() |
| 77 | + return svc.valuesReceived[name] |
| 78 | + } |
| 79 | + if err := teststat.TestCounter(counter, valuef); err != nil { |
| 80 | + t.Fatal(err) |
| 81 | + } |
| 82 | + if err := testDimensions(svc, name, label, value); err != nil { |
| 83 | + t.Fatal(err) |
| 84 | + } |
| 85 | +} |
| 86 | + |
| 87 | +func TestGauge(t *testing.T) { |
| 88 | + namespace, name := "abc", "def" |
| 89 | + label, value := "label", "value" |
| 90 | + svc := newMockCloudWatch() |
| 91 | + cw := New(namespace, log.NewNopLogger(), svc) |
| 92 | + gauge := cw.NewGauge(name).With(label, value) |
| 93 | + valuef := func() float64 { |
| 94 | + err := cw.Send() |
| 95 | + if err != nil { |
| 96 | + t.Fatal(err) |
| 97 | + } |
| 98 | + svc.mtx.RLock() |
| 99 | + defer svc.mtx.RUnlock() |
| 100 | + return svc.valuesReceived[name] |
| 101 | + } |
| 102 | + if err := teststat.TestGauge(gauge, valuef); err != nil { |
| 103 | + t.Fatal(err) |
| 104 | + } |
| 105 | + if err := testDimensions(svc, name, label, value); err != nil { |
| 106 | + t.Fatal(err) |
| 107 | + } |
| 108 | +} |
| 109 | + |
| 110 | +func TestHistogram(t *testing.T) { |
| 111 | + namespace, name := "abc", "def" |
| 112 | + label, value := "label", "value" |
| 113 | + svc := newMockCloudWatch() |
| 114 | + cw := New(namespace, log.NewNopLogger(), svc) |
| 115 | + histogram := cw.NewHistogram(name, 50).With(label, value) |
| 116 | + n50 := fmt.Sprintf("%s_50", name) |
| 117 | + n90 := fmt.Sprintf("%s_90", name) |
| 118 | + n95 := fmt.Sprintf("%s_95", name) |
| 119 | + n99 := fmt.Sprintf("%s_99", name) |
| 120 | + quantiles := func() (p50, p90, p95, p99 float64) { |
| 121 | + err := cw.Send() |
| 122 | + if err != nil { |
| 123 | + t.Fatal(err) |
| 124 | + } |
| 125 | + svc.mtx.RLock() |
| 126 | + defer svc.mtx.RUnlock() |
| 127 | + p50 = svc.valuesReceived[n50] |
| 128 | + p90 = svc.valuesReceived[n90] |
| 129 | + p95 = svc.valuesReceived[n95] |
| 130 | + p99 = svc.valuesReceived[n99] |
| 131 | + return |
| 132 | + } |
| 133 | + if err := teststat.TestHistogram(histogram, quantiles, 0.01); err != nil { |
| 134 | + t.Fatal(err) |
| 135 | + } |
| 136 | + if err := testDimensions(svc, n50, label, value); err != nil { |
| 137 | + t.Fatal(err) |
| 138 | + } |
| 139 | + if err := testDimensions(svc, n90, label, value); err != nil { |
| 140 | + t.Fatal(err) |
| 141 | + } |
| 142 | + if err := testDimensions(svc, n95, label, value); err != nil { |
| 143 | + t.Fatal(err) |
| 144 | + } |
| 145 | + if err := testDimensions(svc, n99, label, value); err != nil { |
| 146 | + t.Fatal(err) |
| 147 | + } |
| 148 | +} |
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