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feat(xorm): add max idle time setting for db connections (#2418)

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Add a new optional `CONN_MAX_IDLETIME`[^1]

This allows to set the `SetConnMaxIdleTime` on `database/sql`.
It's useful to allow to close more idle connections to reduce database connections, especially on postgresql.
For me i would like to use it to set a higher max idle connections but they will all be closed after being idle.
So also the last idle connection will be closed when there is no load on forgejo.
I also use it with max connection lifetime, because currently `database/sql` doesn't detect a postgresql master change[^2] and i'll get `[E] can't update runner status: pq: cannot execute UPDATE in a read-only transaction`[^3] on forgejo until the connection is closed.

[^1]: https://pkg.go.dev/database/sql#DB.SetConnMaxIdleTime
[^2]: https://stackoverflow.com/questions/51858659/how-to-safely-discard-golang-database-sql-pooled-connections-for-example-when-t
[^3]: https://matrix.to/#/!zpNKWqkiEOyljSMQDK:matrix.org/$_AJft_amsGn5hXGOYw75JoBJQnW3aKJEpb-Iw53L_TU?via=schinas.net&via=matrix.org&via=nitro.chat

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/2418
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org>
Co-authored-by: Michael Kriese <michael.kriese@visualon.de>
Co-committed-by: Michael Kriese <michael.kriese@visualon.de>
This commit is contained in:
Michael Kriese 2024-02-21 12:17:16 +00:00 • committed by Earl Warren
parent 0533022d63
commit 849de07064
2 changed files with 3 additions and 0 deletions
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1
models/db/engine.go
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@ -146,6 +146,7 @@ func InitEngine(ctx context.Context) error {
xormEngine.SetMaxOpenConns(setting.Database.MaxOpenConns)
xormEngine.SetMaxIdleConns(setting.Database.MaxIdleConns)
xormEngine.SetConnMaxLifetime(setting.Database.ConnMaxLifetime)
xormEngine.SetConnMaxIdleTime(setting.Database.ConnMaxIdleTime)
xormEngine.SetDefaultContext(ctx)
if setting.Database.SlowQueryThreshold > 0 {

2
modules/setting/database.go
View file

@ -42,6 +42,7 @@ var (
DBConnectBackoff time.Duration
MaxIdleConns int
MaxOpenConns int
ConnMaxIdleTime time.Duration
ConnMaxLifetime time.Duration
IterateBufferSize int
AutoMigration bool
@ -81,6 +82,7 @@ func loadDBSetting(rootCfg ConfigProvider) {
} else {
Database.ConnMaxLifetime = sec.Key("CONN_MAX_LIFETIME").MustDuration(0)
}
Database.ConnMaxIdleTime = sec.Key("CONN_MAX_IDLETIME").MustDuration(0)
Database.MaxOpenConns = sec.Key("MAX_OPEN_CONNS").MustInt(0)
Database.IterateBufferSize = sec.Key("ITERATE_BUFFER_SIZE").MustInt(50)