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metrics.go
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metrics.go
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// SPDX-License-Identifier: AGPL-3.0-only
//
// 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, version 3.
//
// 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 <https://www.gnu.org/licenses/>
package dal
import (
"context"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/uber-go/tally/v4"
"gorm.io/gorm"
gormLogger "gorm.io/gorm/logger"
"github.com/bangumi/server/internal/errgo"
"github.com/bangumi/server/internal/metrics"
)
func newMetricsLog(log gormLogger.Interface, scope tally.Scope) gormLogger.Interface {
return metricsLog{
Interface: log,
h: scope.Histogram("sql_time", metrics.SQLTimeBucket()),
}
}
type metricsLog struct {
gormLogger.Interface
h tally.Histogram
}
func (l metricsLog) Trace(
ctx context.Context,
begin time.Time,
fc func() (sql string, rowsAffected int64), err error,
) {
fc()
l.h.RecordDuration(time.Since(begin))
}
func setupMetrics(db *gorm.DB, scope tally.Scope, register prometheus.Registerer) error {
db.Logger = newMetricsLog(db.Logger, scope)
var DatabaseQuery = prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "chii_db_execute_total",
Help: "Number of executing sql.",
},
[]string{"table"},
)
// uber/tally doesn't like dynamic tag value.
err := db.Callback().Query().Before("gorm:select").Register("metrics:select", func(db *gorm.DB) {
DatabaseQuery.WithLabelValues(db.Statement.Table).Inc()
})
if err != nil {
return errgo.Wrap(err, "gorm callback")
}
register.MustRegister(DatabaseQuery)
return nil
}