| 1 | // Copyright 2019 The Go Authors. All rights reserved. |
|---|---|
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | package metric |
| 6 | |
| 7 | import ( |
| 8 | "fmt" |
| 9 | "sort" |
| 10 | "time" |
| 11 | |
| 12 | "golang.org/x/tools/internal/event/keys" |
| 13 | "golang.org/x/tools/internal/event/label" |
| 14 | ) |
| 15 | |
| 16 | // Data represents a single point in the time series of a metric. |
| 17 | // This provides the common interface to all metrics no matter their data |
| 18 | // format. |
| 19 | // To get the actual values for the metric you must type assert to a concrete |
| 20 | // metric type. |
| 21 | type Data interface { |
| 22 | // Handle returns the metric handle this data is for. |
| 23 | //TODO: rethink the concept of metric handles |
| 24 | Handle() string |
| 25 | // Groups reports the rows that currently exist for this metric. |
| 26 | Groups() [][]label.Label |
| 27 | } |
| 28 | |
| 29 | // Int64Data is a concrete implementation of Data for int64 scalar metrics. |
| 30 | type Int64Data struct { |
| 31 | // Info holds the original construction information. |
| 32 | Info *Scalar |
| 33 | // IsGauge is true for metrics that track values, rather than increasing over time. |
| 34 | IsGauge bool |
| 35 | // Rows holds the per group values for the metric. |
| 36 | Rows []int64 |
| 37 | // End is the last time this metric was updated. |
| 38 | EndTime time.Time |
| 39 | |
| 40 | groups [][]label.Label |
| 41 | key *keys.Int64 |
| 42 | } |
| 43 | |
| 44 | // Float64Data is a concrete implementation of Data for float64 scalar metrics. |
| 45 | type Float64Data struct { |
| 46 | // Info holds the original construction information. |
| 47 | Info *Scalar |
| 48 | // IsGauge is true for metrics that track values, rather than increasing over time. |
| 49 | IsGauge bool |
| 50 | // Rows holds the per group values for the metric. |
| 51 | Rows []float64 |
| 52 | // End is the last time this metric was updated. |
| 53 | EndTime time.Time |
| 54 | |
| 55 | groups [][]label.Label |
| 56 | key *keys.Float64 |
| 57 | } |
| 58 | |
| 59 | // HistogramInt64Data is a concrete implementation of Data for int64 histogram metrics. |
| 60 | type HistogramInt64Data struct { |
| 61 | // Info holds the original construction information. |
| 62 | Info *HistogramInt64 |
| 63 | // Rows holds the per group values for the metric. |
| 64 | Rows []*HistogramInt64Row |
| 65 | // End is the last time this metric was updated. |
| 66 | EndTime time.Time |
| 67 | |
| 68 | groups [][]label.Label |
| 69 | key *keys.Int64 |
| 70 | } |
| 71 | |
| 72 | // HistogramInt64Row holds the values for a single row of a HistogramInt64Data. |
| 73 | type HistogramInt64Row struct { |
| 74 | // Values is the counts per bucket. |
| 75 | Values []int64 |
| 76 | // Count is the total count. |
| 77 | Count int64 |
| 78 | // Sum is the sum of all the values recorded. |
| 79 | Sum int64 |
| 80 | // Min is the smallest recorded value. |
| 81 | Min int64 |
| 82 | // Max is the largest recorded value. |
| 83 | Max int64 |
| 84 | } |
| 85 | |
| 86 | // HistogramFloat64Data is a concrete implementation of Data for float64 histogram metrics. |
| 87 | type HistogramFloat64Data struct { |
| 88 | // Info holds the original construction information. |
| 89 | Info *HistogramFloat64 |
| 90 | // Rows holds the per group values for the metric. |
| 91 | Rows []*HistogramFloat64Row |
| 92 | // End is the last time this metric was updated. |
| 93 | EndTime time.Time |
| 94 | |
| 95 | groups [][]label.Label |
| 96 | key *keys.Float64 |
| 97 | } |
| 98 | |
| 99 | // HistogramFloat64Row holds the values for a single row of a HistogramFloat64Data. |
| 100 | type HistogramFloat64Row struct { |
| 101 | // Values is the counts per bucket. |
| 102 | Values []int64 |
| 103 | // Count is the total count. |
| 104 | Count int64 |
| 105 | // Sum is the sum of all the values recorded. |
| 106 | Sum float64 |
| 107 | // Min is the smallest recorded value. |
| 108 | Min float64 |
| 109 | // Max is the largest recorded value. |
| 110 | Max float64 |
| 111 | } |
| 112 | |
| 113 | func labelListEqual(a, b []label.Label) bool { |
| 114 | //TODO: make this more efficient |
| 115 | return fmt.Sprint(a) == fmt.Sprint(b) |
| 116 | } |
| 117 | |
| 118 | func labelListLess(a, b []label.Label) bool { |
| 119 | //TODO: make this more efficient |
| 120 | return fmt.Sprint(a) < fmt.Sprint(b) |
| 121 | } |
| 122 | |
| 123 | func getGroup(lm label.Map, g *[][]label.Label, keys []label.Key) (int, bool) { |
| 124 | group := make([]label.Label, len(keys)) |
| 125 | for i, key := range keys { |
| 126 | l := lm.Find(key) |
| 127 | if l.Valid() { |
| 128 | group[i] = l |
| 129 | } |
| 130 | } |
| 131 | old := *g |
| 132 | index := sort.Search(len(old), func(i int) bool { |
| 133 | return !labelListLess(old[i], group) |
| 134 | }) |
| 135 | if index < len(old) && labelListEqual(group, old[index]) { |
| 136 | // not a new group |
| 137 | return index, false |
| 138 | } |
| 139 | *g = make([][]label.Label, len(old)+1) |
| 140 | copy(*g, old[:index]) |
| 141 | copy((*g)[index+1:], old[index:]) |
| 142 | (*g)[index] = group |
| 143 | return index, true |
| 144 | } |
| 145 | |
| 146 | func (data *Int64Data) Handle() string { return data.Info.Name } |
| 147 | func (data *Int64Data) Groups() [][]label.Label { return data.groups } |
| 148 | |
| 149 | func (data *Int64Data) modify(at time.Time, lm label.Map, f func(v int64) int64) Data { |
| 150 | index, insert := getGroup(lm, &data.groups, data.Info.Keys) |
| 151 | old := data.Rows |
| 152 | if insert { |
| 153 | data.Rows = make([]int64, len(old)+1) |
| 154 | copy(data.Rows, old[:index]) |
| 155 | copy(data.Rows[index+1:], old[index:]) |
| 156 | } else { |
| 157 | data.Rows = make([]int64, len(old)) |
| 158 | copy(data.Rows, old) |
| 159 | } |
| 160 | data.Rows[index] = f(data.Rows[index]) |
| 161 | data.EndTime = at |
| 162 | frozen := *data |
| 163 | return &frozen |
| 164 | } |
| 165 | |
| 166 | func (data *Int64Data) count(at time.Time, lm label.Map, l label.Label) Data { |
| 167 | return data.modify(at, lm, func(v int64) int64 { |
| 168 | return v + 1 |
| 169 | }) |
| 170 | } |
| 171 | |
| 172 | func (data *Int64Data) sum(at time.Time, lm label.Map, l label.Label) Data { |
| 173 | return data.modify(at, lm, func(v int64) int64 { |
| 174 | return v + data.key.From(l) |
| 175 | }) |
| 176 | } |
| 177 | |
| 178 | func (data *Int64Data) latest(at time.Time, lm label.Map, l label.Label) Data { |
| 179 | return data.modify(at, lm, func(v int64) int64 { |
| 180 | return data.key.From(l) |
| 181 | }) |
| 182 | } |
| 183 | |
| 184 | func (data *Float64Data) Handle() string { return data.Info.Name } |
| 185 | func (data *Float64Data) Groups() [][]label.Label { return data.groups } |
| 186 | |
| 187 | func (data *Float64Data) modify(at time.Time, lm label.Map, f func(v float64) float64) Data { |
| 188 | index, insert := getGroup(lm, &data.groups, data.Info.Keys) |
| 189 | old := data.Rows |
| 190 | if insert { |
| 191 | data.Rows = make([]float64, len(old)+1) |
| 192 | copy(data.Rows, old[:index]) |
| 193 | copy(data.Rows[index+1:], old[index:]) |
| 194 | } else { |
| 195 | data.Rows = make([]float64, len(old)) |
| 196 | copy(data.Rows, old) |
| 197 | } |
| 198 | data.Rows[index] = f(data.Rows[index]) |
| 199 | data.EndTime = at |
| 200 | frozen := *data |
| 201 | return &frozen |
| 202 | } |
| 203 | |
| 204 | func (data *Float64Data) sum(at time.Time, lm label.Map, l label.Label) Data { |
| 205 | return data.modify(at, lm, func(v float64) float64 { |
| 206 | return v + data.key.From(l) |
| 207 | }) |
| 208 | } |
| 209 | |
| 210 | func (data *Float64Data) latest(at time.Time, lm label.Map, l label.Label) Data { |
| 211 | return data.modify(at, lm, func(v float64) float64 { |
| 212 | return data.key.From(l) |
| 213 | }) |
| 214 | } |
| 215 | |
| 216 | func (data *HistogramInt64Data) Handle() string { return data.Info.Name } |
| 217 | func (data *HistogramInt64Data) Groups() [][]label.Label { return data.groups } |
| 218 | |
| 219 | func (data *HistogramInt64Data) modify(at time.Time, lm label.Map, f func(v *HistogramInt64Row)) Data { |
| 220 | index, insert := getGroup(lm, &data.groups, data.Info.Keys) |
| 221 | old := data.Rows |
| 222 | var v HistogramInt64Row |
| 223 | if insert { |
| 224 | data.Rows = make([]*HistogramInt64Row, len(old)+1) |
| 225 | copy(data.Rows, old[:index]) |
| 226 | copy(data.Rows[index+1:], old[index:]) |
| 227 | } else { |
| 228 | data.Rows = make([]*HistogramInt64Row, len(old)) |
| 229 | copy(data.Rows, old) |
| 230 | v = *data.Rows[index] |
| 231 | } |
| 232 | oldValues := v.Values |
| 233 | v.Values = make([]int64, len(data.Info.Buckets)) |
| 234 | copy(v.Values, oldValues) |
| 235 | f(&v) |
| 236 | data.Rows[index] = &v |
| 237 | data.EndTime = at |
| 238 | frozen := *data |
| 239 | return &frozen |
| 240 | } |
| 241 | |
| 242 | func (data *HistogramInt64Data) record(at time.Time, lm label.Map, l label.Label) Data { |
| 243 | return data.modify(at, lm, func(v *HistogramInt64Row) { |
| 244 | value := data.key.From(l) |
| 245 | v.Sum += value |
| 246 | if v.Min > value || v.Count == 0 { |
| 247 | v.Min = value |
| 248 | } |
| 249 | if v.Max < value || v.Count == 0 { |
| 250 | v.Max = value |
| 251 | } |
| 252 | v.Count++ |
| 253 | for i, b := range data.Info.Buckets { |
| 254 | if value <= b { |
| 255 | v.Values[i]++ |
| 256 | } |
| 257 | } |
| 258 | }) |
| 259 | } |
| 260 | |
| 261 | func (data *HistogramFloat64Data) Handle() string { return data.Info.Name } |
| 262 | func (data *HistogramFloat64Data) Groups() [][]label.Label { return data.groups } |
| 263 | |
| 264 | func (data *HistogramFloat64Data) modify(at time.Time, lm label.Map, f func(v *HistogramFloat64Row)) Data { |
| 265 | index, insert := getGroup(lm, &data.groups, data.Info.Keys) |
| 266 | old := data.Rows |
| 267 | var v HistogramFloat64Row |
| 268 | if insert { |
| 269 | data.Rows = make([]*HistogramFloat64Row, len(old)+1) |
| 270 | copy(data.Rows, old[:index]) |
| 271 | copy(data.Rows[index+1:], old[index:]) |
| 272 | } else { |
| 273 | data.Rows = make([]*HistogramFloat64Row, len(old)) |
| 274 | copy(data.Rows, old) |
| 275 | v = *data.Rows[index] |
| 276 | } |
| 277 | oldValues := v.Values |
| 278 | v.Values = make([]int64, len(data.Info.Buckets)) |
| 279 | copy(v.Values, oldValues) |
| 280 | f(&v) |
| 281 | data.Rows[index] = &v |
| 282 | data.EndTime = at |
| 283 | frozen := *data |
| 284 | return &frozen |
| 285 | } |
| 286 | |
| 287 | func (data *HistogramFloat64Data) record(at time.Time, lm label.Map, l label.Label) Data { |
| 288 | return data.modify(at, lm, func(v *HistogramFloat64Row) { |
| 289 | value := data.key.From(l) |
| 290 | v.Sum += value |
| 291 | if v.Min > value || v.Count == 0 { |
| 292 | v.Min = value |
| 293 | } |
| 294 | if v.Max < value || v.Count == 0 { |
| 295 | v.Max = value |
| 296 | } |
| 297 | v.Count++ |
| 298 | for i, b := range data.Info.Buckets { |
| 299 | if value <= b { |
| 300 | v.Values[i]++ |
| 301 | } |
| 302 | } |
| 303 | }) |
| 304 | } |
| 305 |
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