mirror of
https://github.com/tiennm99/db-keepalive.git
synced 2026-05-19 09:26:11 +00:00
tiennm99
e3b7ea5011
Consolidates the *-keepalive family (redis, valkey, postgresql, mysql, mongodb, couchbase) into a single binary with a runtime DB_TYPE dispatch and an Adapter interface. Original repos archived with a pointer here.
50 lines
1.0 KiB
Go
50 lines
1.0 KiB
Go
package adapter
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import (
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"context"
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"database/sql"
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_ "github.com/lib/pq"
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)
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func init() {
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Registry["postgresql"] = func() (Adapter, error) { return &postgresAdapter{}, nil }
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Registry["postgres"] = Registry["postgresql"]
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}
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type postgresAdapter struct {
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db *sql.DB
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}
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func (a *postgresAdapter) Connect(ctx context.Context) error {
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uri, err := envOrFail("SERVICE_URI")
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if err != nil {
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return err
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}
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db, err := sql.Open("postgres", uri)
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if err != nil {
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return err
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}
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a.db = db
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return a.db.PingContext(ctx)
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}
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func (a *postgresAdapter) Increment(ctx context.Context) (int64, error) {
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tx, err := a.db.BeginTx(ctx, &sql.TxOptions{Isolation: sql.LevelReadCommitted})
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if err != nil {
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return 0, err
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}
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var value int64
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if err := tx.QueryRowContext(ctx,
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`UPDATE keepalive SET value = value + 1 WHERE key = 'counter' RETURNING value`,
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).Scan(&value); err != nil {
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tx.Rollback()
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return 0, err
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}
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return value, tx.Commit()
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}
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func (a *postgresAdapter) Close(_ context.Context) error {
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return a.db.Close()
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}
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