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utils.go
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/
utils.go
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package bqmigrator
import (
"errors"
"fmt"
"regexp"
"strconv"
"strings"
"time"
)
func parseMigrationNumber(migrationName string) (int, error) {
if len(migrationName) < 4 {
return 0, errors.New("migration name must be at least 4 characters long")
}
matches := regexp.MustCompile(`^\d{4}(_[a-z]+)+$`).MatchString(migrationName)
if !matches {
return 0, errors.New("migration name must be in the format 0000_migration_name, regex: ^\\d{4}(_[a-z]+)+$")
}
num, err := strconv.Atoi(strings.TrimLeft(migrationName[0:4], "0"))
if err != nil {
return 0, fmt.Errorf("parsing migration number: %v", err)
}
return num, nil
}
func getDatasetString(target Target) string {
datasets := make([]string, len(target.Datasets))
for i, dataset := range target.Datasets {
datasets[i] = dataset.getDatasetString()
}
return fmt.Sprintf("[%s]", strings.Join(datasets, ", "))
}
func tableCopyName(dataset string) string {
return fmt.Sprintf("%s_copy", dataset)
}
func fullTableName(dataset, table string) string {
return fmt.Sprintf("`%s.%s`", dataset, table)
}
func retryUntil[T comparable](fn func() (T, error), maxTries int, delay time.Duration, resEq T) (T, error) {
var result T
var err error
for i := 0; i < maxTries; i++ {
result, err = fn()
if err == nil && result == resEq {
return result, nil
}
time.Sleep(delay)
}
return result, err
}