86 lines
1.9 KiB
Go
86 lines
1.9 KiB
Go
package dbwait
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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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"net/url"
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"os"
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"strings"
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"time"
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)
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func Wait(databaseURL *url.URL, period time.Duration, timeout time.Duration) error {
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var err error
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var sqlDB *sql.DB
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switch databaseURL.Scheme {
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case "oracle":
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sqlDB, err = sql.Open("oracle", databaseURL.String())
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if err != nil {
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return err
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}
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case "postgres":
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sqlDB, err = sql.Open("postgres", databaseURL.String())
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if err != nil {
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return err
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}
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}
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defer sqlDB.Close()
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ctx, cancel := context.WithTimeout(context.Background(), timeout)
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defer cancel()
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ticker := time.NewTicker(time.Nanosecond)
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<-ticker.C
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LOOP:
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for {
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select {
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case <-ctx.Done():
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return ctx.Err()
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case <-ticker.C:
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queryCtx, queryCancel := context.WithTimeout(ctx, period)
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defer queryCancel()
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switch databaseURL.Scheme {
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case "oracle":
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row := sqlDB.QueryRowContext(queryCtx, "SELECT INSTANCE_NAME, STATUS, DATABASE_STATUS FROM V$INSTANCE WHERE INSTANCE_NAME=$1", databaseURL.Path)
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var instaceName string
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var instanceStatus string
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var databaseStatus string
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err := row.Scan(instaceName, instanceStatus, databaseStatus)
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if err != nil {
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fmt.Fprintf(os.Stderr, "%s: %s\n", time.Now().String(), err.Error())
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ticker.Reset(period)
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continue LOOP
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}
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if strings.ToUpper(instanceStatus) != "OPEN" {
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fmt.Fprintf(os.Stderr, "%s: Instance status is not open: %s\n", time.Now().String(), instanceStatus)
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ticker.Reset(period)
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continue LOOP
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}
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if strings.ToUpper(databaseStatus) != "OPEN" {
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fmt.Fprintf(os.Stderr, "%s: Database status is not active: %s\n", time.Now().String(), databaseStatus)
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ticker.Reset(period)
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continue LOOP
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}
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return nil
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case "postgres":
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row := sqlDB.QueryRowContext(queryCtx, "SELECT 1 AS ROW")
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if row.Err() != nil {
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fmt.Fprintf(os.Stderr, "%s: %s\n", time.Now().String(), err.Error())
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ticker.Reset(period)
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continue LOOP
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}
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return nil
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}
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}
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}
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}
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