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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,152 @@ | ||
| /* | ||
| * Copyright (C) 2020-2022, IrineSistiana | ||
| * | ||
| * This file is part of mosdns. | ||
| * | ||
| * mosdns is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * mosdns is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <https://www.gnu.org/licenses/>. | ||
| */ | ||
|
|
||
| package metrics | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "github.com/rcrowley/go-metrics" | ||
| "go.uber.org/zap" | ||
| "net/http" | ||
| "sync" | ||
| ) | ||
|
|
||
| type Var interface { | ||
| // Publish should return a build-in type or a map[string]interface{} | ||
| // of build-in types. | ||
| Publish() interface{} | ||
| } | ||
|
|
||
| type Registry struct { | ||
| l sync.RWMutex | ||
| m map[string]Var | ||
| } | ||
|
|
||
| func NewRegistry() *Registry { | ||
| return &Registry{ | ||
| m: make(map[string]Var), | ||
| } | ||
| } | ||
|
|
||
| func (r *Registry) Get(name string) Var { | ||
| r.l.RLock() | ||
| defer r.l.RUnlock() | ||
| return r.m[name] | ||
| } | ||
|
|
||
| func (r *Registry) GetOrSet(name string, f func() Var) Var { | ||
| r.l.Lock() | ||
| defer r.l.Unlock() | ||
| v, ok := r.m[name] | ||
| if !ok { | ||
| v = f() | ||
| r.m[name] = v | ||
| } | ||
| return v | ||
| } | ||
|
|
||
| func (r *Registry) Set(name string, v Var) { | ||
| r.l.Lock() | ||
| defer r.l.Unlock() | ||
| r.m[name] = v | ||
| } | ||
|
|
||
| func (r *Registry) Publish() interface{} { | ||
| m := make(map[string]interface{}) | ||
| r.l.RLock() | ||
| defer r.l.RUnlock() | ||
| for name, v := range r.m { | ||
| m[name] = v.Publish() | ||
| } | ||
| return m | ||
| } | ||
|
|
||
| type Histogram struct { | ||
| metrics.Histogram | ||
| } | ||
|
|
||
| func NewHistogram(reservoirSize int) *Histogram { | ||
| return &Histogram{Histogram: metrics.NewHistogram(metrics.NewUniformSample(reservoirSize))} | ||
| } | ||
|
|
||
| func (h *Histogram) Publish() interface{} { | ||
| m := make(map[string]interface{}) | ||
| ps := h.Percentiles([]float64{0, 0.25, 0.5, 0.75, 1}) | ||
| m["min"] = ps[0] | ||
| m["p25"] = ps[1] | ||
| m["p50"] = ps[2] | ||
| m["p75"] = ps[3] | ||
| m["max"] = ps[4] | ||
| m["avg"] = int64(h.Mean()) | ||
| return m | ||
| } | ||
|
|
||
| type Counter struct { | ||
| metrics.Counter | ||
| } | ||
|
|
||
| func NewCounter() *Counter { | ||
| return &Counter{Counter: metrics.NewCounter()} | ||
| } | ||
|
|
||
| func (c *Counter) Publish() interface{} { | ||
| return c.Count() | ||
| } | ||
|
|
||
| type Gauge struct { | ||
| metrics.Gauge | ||
| } | ||
|
|
||
| func NewGauge() *Gauge { | ||
| return &Gauge{Gauge: metrics.NewGauge()} | ||
| } | ||
|
|
||
| type GaugeFunc struct { | ||
| l sync.Mutex | ||
| f func() int64 | ||
| } | ||
|
|
||
| func NewGaugeFunc(f func() int64) *GaugeFunc { | ||
| return &GaugeFunc{f: f} | ||
| } | ||
|
|
||
| func (gf *GaugeFunc) Publish() interface{} { | ||
| gf.l.Lock() | ||
| defer gf.l.Unlock() | ||
| return gf.f() | ||
| } | ||
|
|
||
| func (g *Gauge) Publish() interface{} { | ||
| return g.Value() | ||
| } | ||
|
|
||
| func HandleFunc(r Var, lg *zap.Logger) http.HandlerFunc { | ||
| return func(w http.ResponseWriter, req *http.Request) { | ||
| b, err := json.MarshalIndent(r.Publish(), "", " ") | ||
| if err != nil { | ||
| w.WriteHeader(http.StatusInternalServerError) | ||
| w.Write([]byte(err.Error())) | ||
| lg.Error("failed to encode json", zap.Error(err)) | ||
| return | ||
| } | ||
| if _, err := w.Write(b); err != nil { | ||
| lg.Error("http write err", zap.Error(err)) | ||
| } | ||
| } | ||
| } |