106 lines
3.1 KiB
Go
106 lines
3.1 KiB
Go
/*
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* Copyright (C) 2020-2022, IrineSistiana
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*
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* This file is part of mosdns.
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*
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* mosdns is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* mosdns is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package metrics_collector
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import (
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"context"
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"errors"
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"github.com/IrineSistiana/mosdns/v5/pkg/query_context"
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"github.com/IrineSistiana/mosdns/v5/plugin/executable/sequence"
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"github.com/prometheus/client_golang/prometheus"
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"time"
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)
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const PluginType = "metrics_collector"
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func init() {
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sequence.MustRegExecQuickSetup(PluginType, QuickSetup)
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}
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var _ sequence.RecursiveExecutable = (*Collector)(nil)
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type Collector struct {
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queryTotal prometheus.Counter
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errTotal prometheus.Counter
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thread prometheus.Gauge
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responseLatency prometheus.Histogram
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}
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// NewCollector inits a new Collector with given name to r.
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// name must be unique in the r.
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func NewCollector(r prometheus.Registerer, name string) (*Collector, error) {
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if len(name) == 0 {
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return nil, errors.New("collector must has a name")
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}
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lb := map[string]string{"name": name}
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var c = &Collector{
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queryTotal: prometheus.NewCounter(prometheus.CounterOpts{
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Name: "query_total",
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Help: "The total number of queries pass through",
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ConstLabels: lb,
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}),
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errTotal: prometheus.NewCounter(prometheus.CounterOpts{
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Name: "err_total",
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Help: "The total number of queries failed",
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ConstLabels: lb,
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}),
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thread: prometheus.NewGauge(prometheus.GaugeOpts{
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Name: "thread",
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Help: "The number of threads that are currently being processed",
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ConstLabels: lb,
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}),
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responseLatency: prometheus.NewHistogram(prometheus.HistogramOpts{
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Name: "response_latency_millisecond",
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Help: "The response latency in millisecond",
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Buckets: []float64{1, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 5000},
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ConstLabels: lb,
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}),
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}
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for _, collector := range [...]prometheus.Collector{c.queryTotal, c.errTotal, c.thread, c.responseLatency} {
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if err := r.Register(collector); err != nil {
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return nil, err
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}
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}
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return c, nil
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}
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func (c *Collector) Exec(ctx context.Context, qCtx *query_context.Context, next sequence.ChainWalker) error {
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c.thread.Inc()
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defer c.thread.Dec()
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c.queryTotal.Inc()
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start := time.Now()
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err := next.ExecNext(ctx, qCtx)
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if err != nil {
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c.errTotal.Inc()
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}
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if qCtx.R() != nil {
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c.responseLatency.Observe(float64(time.Since(start).Milliseconds()))
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}
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return err
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}
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// QuickSetup format: metrics_name
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func QuickSetup(bp sequence.BQ, s string) (any, error) {
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r := prometheus.WrapRegistererWithPrefix(PluginType+"_", bp.M().GetMetricsReg())
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return NewCollector(r, s)
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}
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