4645805b18
To prevent longlived unused connections, set the maximum time to 30 minutes to prevent proxies and loadbalancers forcefully cutting the connection. This helps in scenarios with low load/requests to a DB. Change-Id: I7dba15ef97f6f6541e872a6fb1d3a9bbbfe5bb50
44 lines
1.3 KiB
Go
44 lines
1.3 KiB
Go
// Copyright (C) 2019 Storj Labs, Inc.
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// See LICENSE for copying information.
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package dbutil
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import (
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"database/sql"
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"flag"
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"time"
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"github.com/spacemonkeygo/monkit/v3"
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)
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var (
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maxIdleConns = flag.Int("db.max_idle_conns", 1, "Maximum Amount of Idle Database connections, -1 means the stdlib default")
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maxOpenConns = flag.Int("db.max_open_conns", 5, "Maximum Amount of Open Database connections, -1 means the stdlib default")
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connMaxLifetime = flag.Duration("db.conn_max_lifetime", 30*time.Minute, "Maximum Database Connection Lifetime, -1ns means the stdlib default")
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)
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// ConfigurableDB contains methods for configuring a database.
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type ConfigurableDB interface {
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SetMaxIdleConns(int)
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SetMaxOpenConns(int)
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SetConnMaxLifetime(time.Duration)
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Stats() sql.DBStats
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}
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// Configure Sets Connection Boundaries and adds db_stats monitoring to monkit.
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func Configure(db ConfigurableDB, dbName string, mon *monkit.Scope) {
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if *maxIdleConns >= 0 {
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db.SetMaxIdleConns(*maxIdleConns)
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}
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if *maxOpenConns >= 0 {
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db.SetMaxOpenConns(*maxOpenConns)
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}
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if *connMaxLifetime >= 0 {
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db.SetConnMaxLifetime(*connMaxLifetime)
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}
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mon.Chain(monkit.StatSourceFunc(
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func(cb func(key monkit.SeriesKey, field string, val float64)) {
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monkit.StatSourceFromStruct(monkit.NewSeriesKey("db_stats").WithTag("db_name", dbName), db.Stats()).Stats(cb)
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}))
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}
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