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022bc2a714
## What changed? Adding sql connection pool metrics from stdlib `Stats` ## Why? Expose more metrics for config fine tuning ## How did you test it? - [x] built - [x] run locally and tested manually - [x] covered by existing tests - [ ] added new unit test(s) - [ ] added new functional test(s) --------- Co-authored-by: Roey Berman <[email protected]> Co-authored-by: Roey Berman <[email protected]>
99 lines
2.7 KiB
Go
99 lines
2.7 KiB
Go
package postgresql
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import (
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"fmt"
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"strings"
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"github.com/jmoiron/sqlx"
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"go.temporal.io/api/serviceerror"
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"go.temporal.io/server/common/clock"
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"go.temporal.io/server/common/config"
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"go.temporal.io/server/common/log"
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"go.temporal.io/server/common/metrics"
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"go.temporal.io/server/common/persistence/sql"
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"go.temporal.io/server/common/persistence/sql/sqlplugin"
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"go.temporal.io/server/common/persistence/sql/sqlplugin/postgresql/driver"
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"go.temporal.io/server/common/persistence/sql/sqlplugin/postgresql/session"
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"go.temporal.io/server/common/resolver"
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)
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const (
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// PluginName is the name of the plugin
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PluginName = "postgres12"
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PluginNamePGX = "postgres12_pgx"
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)
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var defaultDatabaseNames = []string{
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"postgres", // normal PostgreSQL default DB name
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"defaultdb", // special behavior for Aiven: #1389
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}
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type plugin struct {
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d driver.Driver
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}
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var _ sqlplugin.Plugin = (*plugin)(nil)
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func init() {
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sql.RegisterPlugin(PluginName, &plugin{&driver.PQDriver{}})
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sql.RegisterPlugin(PluginNamePGX, &plugin{&driver.PGXDriver{}})
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}
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// CreateDB initialize the db object
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func (d *plugin) CreateDB(
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dbKind sqlplugin.DbKind,
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cfg *config.SQL,
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r resolver.ServiceResolver,
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logger log.Logger,
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metricsHandler metrics.Handler,
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) (sqlplugin.GenericDB, error) {
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connect := func() (*sqlx.DB, error) {
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if cfg.Connect != nil {
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return cfg.Connect(cfg)
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}
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return d.createDBConnection(cfg, r)
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}
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needsRefresh := d.d.IsConnNeedsRefreshError
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handle := sqlplugin.NewDatabaseHandle(dbKind, connect, needsRefresh, logger, metricsHandler, clock.NewRealTimeSource())
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db := newDB(dbKind, cfg.DatabaseName, d.d, handle, nil)
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return db, nil
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}
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// CreateDBConnection creates a returns a reference to a logical connection to the
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// underlying SQL database. The returned object is to tied to a single
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// SQL database and the object can be used to perform CRUD operations on
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// the tables in the database
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func (d *plugin) createDBConnection(
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cfg *config.SQL,
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resolver resolver.ServiceResolver,
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) (*sqlx.DB, error) {
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if cfg.DatabaseName != "" {
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postgresqlSession, err := session.NewSession(cfg, d.d, resolver)
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if err != nil {
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return nil, err
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}
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return postgresqlSession.DB, nil
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}
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// database name not provided
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// try defaults
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defer func() { cfg.DatabaseName = "" }()
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var errors []error
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for _, databaseName := range defaultDatabaseNames {
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cfg.DatabaseName = databaseName
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if postgresqlSession, err := session.NewSession(
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cfg,
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d.d,
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resolver,
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); err == nil {
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return postgresqlSession.DB, nil
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} else {
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errors = append(errors, err)
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}
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}
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return nil, serviceerror.NewUnavailable(
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fmt.Sprintf("unable to connect to DB, tried default DB names: %v, errors: %v", strings.Join(defaultDatabaseNames, ","), errors),
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)
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}
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