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sql.go
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sql.go
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package wait
import (
"context"
"database/sql"
"fmt"
"time"
"github.com/docker/go-connections/nat"
)
const (
oracleCheck = "select 1 from dual"
postgresCheck = "select 1"
)
//ForSQL constructs a new waitForSql strategy for the given driver
func ForSQL(port nat.Port, driver string, url func(nat.Port) string) *waitForSql {
return &waitForSql{
Port: port,
URL: url,
Driver: driver,
startupTimeout: defaultStartupTimeout(),
PollInterval: defaultPollInterval(),
}
}
type waitForSql struct {
URL func(port nat.Port) string
Driver string
Port nat.Port
startupTimeout time.Duration
PollInterval time.Duration
}
//Timeout sets the maximum waiting time for the strategy after which it'll give up and return an error
func (w *waitForSql) Timeout(duration time.Duration) *waitForSql {
w.startupTimeout = duration
return w
}
//WithPollInterval can be used to override the default polling interval of 100 milliseconds
func (w *waitForSql) WithPollInterval(pollInterval time.Duration) *waitForSql {
w.PollInterval = pollInterval
return w
}
//WaitUntilReady repeatedly tries to run "SELECT 1" query on the given port using sql and driver.
// If the it doesn't succeed until the timeout value which defaults to 60 seconds, it will return an error
func (w *waitForSql) WaitUntilReady(ctx context.Context, target StrategyTarget) (err error) {
ctx, cancel := context.WithTimeout(ctx, w.startupTimeout)
defer cancel()
ticker := time.NewTicker(w.PollInterval)
defer ticker.Stop()
var port nat.Port
port, err = target.MappedPort(ctx, w.Port)
for port == "" {
select {
case <-ctx.Done():
return fmt.Errorf("%s:%w", ctx.Err(), err)
case <-ticker.C:
port, err = target.MappedPort(ctx, w.Port)
}
}
db, err := sql.Open(w.Driver, w.URL(port))
if err != nil {
return fmt.Errorf("sql.Open: %v", err)
}
defer db.Close()
for {
select {
case <-ctx.Done():
return ctx.Err()
case <-ticker.C:
checkStatement := postgresCheck
if w.Driver == "godror" {
checkStatement = oracleCheck
}
if _, err := db.ExecContext(ctx, checkStatement); err != nil {
continue
}
return nil
}
}
}