bel
77 lines
1.4 KiB
Go
77 lines
1.4 KiB
Go
package with
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import (
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"context"
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"database/sql"
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"fmt"
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"log"
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"net/url"
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"time"
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_ "modernc.org/sqlite"
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)
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func SQL(ctx context.Context, conn string, foo func(*sql.DB) error) error {
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u, err := url.Parse(conn)
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if err != nil {
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return err
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}
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switch u.Scheme {
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case "sqlite":
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return Sqlite(ctx, conn, foo)
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case "postgres", "postgresql":
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return PSQL(ctx, conn, foo)
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}
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return fmt.Errorf("unknown sql scheme %q", u.Scheme)
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}
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func _sql(ctx context.Context, engine, conn string, foo func(db *sql.DB) error) error {
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log.Printf("opening %s %s...", engine, conn)
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db, err := sql.Open(engine, conn)
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if err != nil {
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return err
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}
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defer func() {
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log.Println("closed:", db.Close())
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}()
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if err := Timeout(ctx, 10*time.Second, func(ctx context.Context) error {
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pinged := make(chan bool)
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defer close(pinged)
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for ctx.Err() == nil {
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log.Println("pinging...")
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go func() {
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defer func() { recover() }()
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err := db.PingContext(ctx)
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if err != nil {
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log.Println("!", err)
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}
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ok := err == nil
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select {
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case pinged <- ok:
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case <-ctx.Done():
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case <-time.After(time.Second * 5):
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}
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}()
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select {
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case <-ctx.Done():
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break
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case ok := <-pinged:
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if ok {
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return nil
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}
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}
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select {
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case <-ctx.Done():
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case <-time.After(time.Second):
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}
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}
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return ctx.Err()
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}); err != nil {
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return err
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}
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log.Println("connected")
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return foo(db)
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}
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