Ilia Denisov
39 lines
1.2 KiB
Go
39 lines
1.2 KiB
Go
package postgres
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import (
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"database/sql"
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"errors"
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"fmt"
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"github.com/XSAM/otelsql"
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)
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// Unregister releases an instrumentation registration. Returned by
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// InstrumentDBStats so callers can detach metrics during shutdown.
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type Unregister func() error
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// InstrumentDBStats registers `database/sql` connection-pool metrics
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// (`db.sql.connection.*`) for db. Statement spans are already attached at open
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// time inside OpenPrimary/OpenReplicas — this function adds the meter-side
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// instrumentation.
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//
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// The returned Unregister detaches the metric callbacks; callers usually
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// invoke it during shutdown after closing db.
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func InstrumentDBStats(db *sql.DB, opts ...Option) (Unregister, error) {
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if db == nil {
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return nil, errors.New("instrument postgres db stats: nil db")
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}
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resolved := evalOptions(opts)
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otelOpts := []otelsql.Option{otelsql.WithAttributes(dbSystemAttribute)}
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if resolved.meterProvider != nil {
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otelOpts = append(otelOpts, otelsql.WithMeterProvider(resolved.meterProvider))
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}
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reg, err := otelsql.RegisterDBStatsMetrics(db, otelOpts...)
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if err != nil {
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return nil, fmt.Errorf("instrument postgres db stats: %w", err)
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}
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return reg.Unregister, nil
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}
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