eth-statediff-service/pkg/prom/db_stats_collector.go

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// VulcanizeDB
// Copyright © 2021 Vulcanize
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program 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 Affero General Public License for more details.
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package prom
import (
"database/sql"
"github.com/prometheus/client_golang/prometheus"
)
const (
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namespace = "eth_statediff_service"
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subsystem = "connections"
)
// DBStatsGetter is an interface that gets sql.DBStats.
type DBStatsGetter interface {
Stats() sql.DBStats
}
// DBStatsCollector implements the prometheus.Collector interface.
type DBStatsCollector struct {
sg DBStatsGetter
// descriptions of exported metrics
maxOpenDesc *prometheus.Desc
openDesc *prometheus.Desc
inUseDesc *prometheus.Desc
idleDesc *prometheus.Desc
waitedForDesc *prometheus.Desc
blockedSecondsDesc *prometheus.Desc
closedMaxIdleDesc *prometheus.Desc
closedMaxLifetimeDesc *prometheus.Desc
}
// NewDBStatsCollector creates a new DBStatsCollector.
func NewDBStatsCollector(dbName string, sg DBStatsGetter) *DBStatsCollector {
labels := prometheus.Labels{"db_name": dbName}
return &DBStatsCollector{
sg: sg,
maxOpenDesc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, subsystem, "max_open"),
"Maximum number of open connections to the database.",
nil,
labels,
),
openDesc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, subsystem, "open"),
"The number of established connections both in use and idle.",
nil,
labels,
),
inUseDesc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, subsystem, "in_use"),
"The number of connections currently in use.",
nil,
labels,
),
idleDesc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, subsystem, "idle"),
"The number of idle connections.",
nil,
labels,
),
waitedForDesc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, subsystem, "waited_for"),
"The total number of connections waited for.",
nil,
labels,
),
blockedSecondsDesc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, subsystem, "blocked_seconds"),
"The total time blocked waiting for a new connection.",
nil,
labels,
),
closedMaxIdleDesc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, subsystem, "closed_max_idle"),
"The total number of connections closed due to SetMaxIdleConns.",
nil,
labels,
),
closedMaxLifetimeDesc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, subsystem, "closed_max_lifetime"),
"The total number of connections closed due to SetConnMaxLifetime.",
nil,
labels,
),
}
}
// Describe implements the prometheus.Collector interface.
func (c DBStatsCollector) Describe(ch chan<- *prometheus.Desc) {
ch <- c.maxOpenDesc
ch <- c.openDesc
ch <- c.inUseDesc
ch <- c.idleDesc
ch <- c.waitedForDesc
ch <- c.blockedSecondsDesc
ch <- c.closedMaxIdleDesc
ch <- c.closedMaxLifetimeDesc
}
// Collect implements the prometheus.Collector interface.
func (c DBStatsCollector) Collect(ch chan<- prometheus.Metric) {
stats := c.sg.Stats()
ch <- prometheus.MustNewConstMetric(
c.maxOpenDesc,
prometheus.GaugeValue,
float64(stats.MaxOpenConnections),
)
ch <- prometheus.MustNewConstMetric(
c.openDesc,
prometheus.GaugeValue,
float64(stats.OpenConnections),
)
ch <- prometheus.MustNewConstMetric(
c.inUseDesc,
prometheus.GaugeValue,
float64(stats.InUse),
)
ch <- prometheus.MustNewConstMetric(
c.idleDesc,
prometheus.GaugeValue,
float64(stats.Idle),
)
ch <- prometheus.MustNewConstMetric(
c.waitedForDesc,
prometheus.CounterValue,
float64(stats.WaitCount),
)
ch <- prometheus.MustNewConstMetric(
c.blockedSecondsDesc,
prometheus.CounterValue,
stats.WaitDuration.Seconds(),
)
ch <- prometheus.MustNewConstMetric(
c.closedMaxIdleDesc,
prometheus.CounterValue,
float64(stats.MaxIdleClosed),
)
ch <- prometheus.MustNewConstMetric(
c.closedMaxLifetimeDesc,
prometheus.CounterValue,
float64(stats.MaxLifetimeClosed),
)
}