mirror of
https://github.com/matrix-org/dendrite.git
synced 2026-01-16 18:43:10 -06:00
68 lines
2.5 KiB
Go
68 lines
2.5 KiB
Go
package sqlutil
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import (
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"database/sql"
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"fmt"
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"regexp"
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"github.com/matrix-org/dendrite/setup/config"
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"github.com/sirupsen/logrus"
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)
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// Open opens a database specified by its database driver name and a driver-specific data source name,
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// usually consisting of at least a database name and connection information. Includes tracing driver
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// if DENDRITE_TRACE_SQL=1
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func Open(dbProperties *config.DatabaseOptions, writer Writer) (*sql.DB, error) {
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var err error
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var driverName, dsn string
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switch {
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case dbProperties.ConnectionString.IsSQLite():
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driverName = "sqlite3"
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dsn, err = ParseFileURI(dbProperties.ConnectionString)
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if err != nil {
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return nil, fmt.Errorf("ParseFileURI: %w", err)
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}
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case dbProperties.ConnectionString.IsPostgres():
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driverName = "postgres"
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dsn = string(dbProperties.ConnectionString)
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default:
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return nil, fmt.Errorf("invalid database connection string %q", dbProperties.ConnectionString)
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}
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if tracingEnabled {
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// install the wrapped driver
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driverName += "-trace"
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}
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db, err := sql.Open(driverName, dsn)
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if err != nil {
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return nil, err
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}
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if driverName != "sqlite3" {
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logger := logrus.WithFields(logrus.Fields{
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"max_open_conns": dbProperties.MaxOpenConns(),
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"max_idle_conns": dbProperties.MaxIdleConns(),
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"conn_max_lifetime": dbProperties.ConnMaxLifetime(),
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"data_source_name": regexp.MustCompile(`://[^@]*@`).ReplaceAllLiteralString(dsn, "://"),
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})
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logger.Debug("Setting DB connection limits")
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db.SetMaxOpenConns(dbProperties.MaxOpenConns())
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db.SetMaxIdleConns(dbProperties.MaxIdleConns())
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db.SetConnMaxLifetime(dbProperties.ConnMaxLifetime())
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if driverName == "postgres" {
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// Perform a quick sanity check if possible that we aren't trying to use more database
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// connections than PostgreSQL is willing to give us.
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var max, reserved int
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if err := db.QueryRow("SELECT setting::integer FROM pg_settings WHERE name='max_connections';").Scan(&max); err != nil {
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return nil, fmt.Errorf("failed to find maximum connections: %w", err)
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}
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if err := db.QueryRow("SELECT setting::integer FROM pg_settings WHERE name='superuser_reserved_connections';").Scan(&reserved); err != nil {
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return nil, fmt.Errorf("failed to find reserved connections: %w", err)
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}
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if configured, allowed := dbProperties.MaxOpenConns(), max-reserved; configured > allowed {
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return nil, fmt.Errorf("the max_open_conns is greater than the %d non-superuser connections that PostgreSQL is configured to allow", allowed)
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}
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}
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}
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return db, nil
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}
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