cloudflare/pint
Publicmirrored from https://github.com/cloudflare/pintAvailable
internal/promapi/failover_test.go
176lines · modecode
| 1 | package promapi |
| 2 | |
| 3 | import ( |
| 4 | "testing" |
| 5 | "time" |
| 6 | |
| 7 | "github.com/prometheus/client_golang/prometheus" |
| 8 | "github.com/stretchr/testify/require" |
| 9 | ) |
| 10 | |
| 11 | func TestCacheCleaner(t *testing.T) { |
| 12 | cache := newQueryCache(time.Minute, time.Now) |
| 13 | quit := make(chan bool) |
| 14 | |
| 15 | // Add some entries to cache |
| 16 | cache.set(1, nil, 0) |
| 17 | cache.set(2, nil, 0) |
| 18 | require.Len(t, cache.entries, 2) |
| 19 | |
| 20 | // Start cache cleaner with very short interval |
| 21 | go cacheCleaner(cache, time.Millisecond*10, quit) |
| 22 | |
| 23 | // Wait for at least one gc cycle |
| 24 | time.Sleep(time.Millisecond * 50) |
| 25 | |
| 26 | // Stop the cleaner |
| 27 | quit <- true |
| 28 | } |
| 29 | |
| 30 | func TestFailoverGroupStartWorkers(t *testing.T) { |
| 31 | type testCaseT struct { |
| 32 | name string |
| 33 | callTwice bool |
| 34 | expectStarted bool |
| 35 | } |
| 36 | |
| 37 | testCases := []testCaseT{ |
| 38 | { |
| 39 | name: "starts workers on first call", |
| 40 | callTwice: false, |
| 41 | expectStarted: true, |
| 42 | }, |
| 43 | { |
| 44 | name: "idempotent on second call", |
| 45 | callTwice: true, |
| 46 | expectStarted: true, |
| 47 | }, |
| 48 | } |
| 49 | |
| 50 | for _, tc := range testCases { |
| 51 | t.Run(tc.name, func(t *testing.T) { |
| 52 | fg := &FailoverGroup{ |
| 53 | name: "test", |
| 54 | servers: []*Prometheus{}, |
| 55 | } |
| 56 | reg := prometheus.NewRegistry() |
| 57 | |
| 58 | fg.StartWorkers(reg) |
| 59 | require.Equal(t, tc.expectStarted, fg.started) |
| 60 | |
| 61 | if tc.callTwice { |
| 62 | fg.StartWorkers(reg) |
| 63 | require.Equal(t, tc.expectStarted, fg.started) |
| 64 | } |
| 65 | |
| 66 | fg.Close(reg) |
| 67 | }) |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | func TestFailoverGroupClose(t *testing.T) { |
| 72 | type testCaseT struct { |
| 73 | name string |
| 74 | startFirst bool |
| 75 | } |
| 76 | |
| 77 | testCases := []testCaseT{ |
| 78 | { |
| 79 | name: "close on not started group is no-op", |
| 80 | startFirst: false, |
| 81 | }, |
| 82 | { |
| 83 | name: "close on started group", |
| 84 | startFirst: true, |
| 85 | }, |
| 86 | } |
| 87 | |
| 88 | for _, tc := range testCases { |
| 89 | t.Run(tc.name, func(t *testing.T) { |
| 90 | fg := &FailoverGroup{ |
| 91 | name: "test", |
| 92 | servers: []*Prometheus{}, |
| 93 | } |
| 94 | reg := prometheus.NewRegistry() |
| 95 | |
| 96 | if tc.startFirst { |
| 97 | fg.StartWorkers(reg) |
| 98 | require.True(t, fg.started) |
| 99 | } |
| 100 | |
| 101 | // Close should not panic regardless of started state |
| 102 | require.NotPanics(t, func() { |
| 103 | fg.Close(reg) |
| 104 | }) |
| 105 | }) |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | func TestFailoverGroupCleanCache(t *testing.T) { |
| 110 | type testCaseT struct { |
| 111 | setup func() *FailoverGroup |
| 112 | name string |
| 113 | expectEmpty bool |
| 114 | expectPanics bool |
| 115 | } |
| 116 | |
| 117 | testCases := []testCaseT{ |
| 118 | { |
| 119 | name: "cleans stale cache entries", |
| 120 | setup: func() *FailoverGroup { |
| 121 | pastTime := time.Now().Add(-time.Hour) |
| 122 | cache := newQueryCache(time.Nanosecond, func() time.Time { return pastTime }) |
| 123 | cache.set(1, nil, 0) |
| 124 | cache.now = time.Now |
| 125 | return &FailoverGroup{ |
| 126 | name: "test", |
| 127 | servers: []*Prometheus{{cache: cache}}, |
| 128 | } |
| 129 | }, |
| 130 | expectEmpty: true, |
| 131 | expectPanics: false, |
| 132 | }, |
| 133 | { |
| 134 | name: "handles nil cache without panic", |
| 135 | setup: func() *FailoverGroup { |
| 136 | return &FailoverGroup{ |
| 137 | name: "test", |
| 138 | servers: []*Prometheus{{cache: nil}}, |
| 139 | } |
| 140 | }, |
| 141 | expectEmpty: false, |
| 142 | expectPanics: false, |
| 143 | }, |
| 144 | { |
| 145 | name: "handles empty servers without panic", |
| 146 | setup: func() *FailoverGroup { |
| 147 | return &FailoverGroup{ |
| 148 | name: "test", |
| 149 | servers: []*Prometheus{}, |
| 150 | } |
| 151 | }, |
| 152 | expectEmpty: false, |
| 153 | expectPanics: false, |
| 154 | }, |
| 155 | } |
| 156 | |
| 157 | for _, tc := range testCases { |
| 158 | t.Run(tc.name, func(t *testing.T) { |
| 159 | fg := tc.setup() |
| 160 | |
| 161 | if tc.expectPanics { |
| 162 | require.Panics(t, func() { |
| 163 | fg.CleanCache() |
| 164 | }) |
| 165 | } else { |
| 166 | require.NotPanics(t, func() { |
| 167 | fg.CleanCache() |
| 168 | }) |
| 169 | } |
| 170 | |
| 171 | if tc.expectEmpty && len(fg.servers) > 0 && fg.servers[0].cache != nil { |
| 172 | require.Empty(t, fg.servers[0].cache.entries) |
| 173 | } |
| 174 | }) |
| 175 | } |
| 176 | } |
| 177 | |