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migration.go
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migration.go
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package version
import (
"errors"
"os"
"path/filepath"
"strings"
)
type GlobalMigrationStatus struct {
ServiceName string
LastMigratedVersion string
}
var (
GlobalMigrationStatusDirPath = "/var/lib/openit/migration"
ErrInvalidServiceName = errors.New("service name should not contain space or upper case letter")
)
func (m *GlobalMigrationStatus) Done(version string) error {
// error if version does not start with 'v'
if strings.HasPrefix(version, "v") {
m.LastMigratedVersion = version
} else {
m.LastMigratedVersion = "v" + version
}
// create runtimePath if not exists
if _, err := os.Stat(GlobalMigrationStatusDirPath); os.IsNotExist(err) {
if err := os.MkdirAll(GlobalMigrationStatusDirPath, 0o755); err != nil {
return err
}
}
// save m.LastMigratedVersion to filepath
filepath := m.GetGlobalMigrationStatusFilePath()
return os.WriteFile(filepath, []byte(m.LastMigratedVersion), 0o644) // nolint: gosec
}
func GetGlobalMigrationStatus(serviceName string) (*GlobalMigrationStatus, error) {
if err := validateServiceName(serviceName); err != nil {
return nil, err
}
m := &GlobalMigrationStatus{
ServiceName: serviceName,
LastMigratedVersion: "",
}
filepath := m.GetGlobalMigrationStatusFilePath()
if _, err := os.Stat(filepath); !os.IsNotExist(err) {
// read string from filepath
buf, err := os.ReadFile(filepath)
if err != nil {
return nil, err
}
m.LastMigratedVersion = strings.TrimSpace(string(buf))
}
return m, nil
}
func (m *GlobalMigrationStatus) GetGlobalMigrationStatusFilePath() string {
return filepath.Join(GlobalMigrationStatusDirPath, m.ServiceName+".status")
}
func validateServiceName(serviceName string) error {
// should not contain space
if strings.Contains(serviceName, " ") {
return ErrInvalidServiceName
}
// should be all lower case
if strings.ToLower(serviceName) != serviceName {
return ErrInvalidServiceName
}
return nil
}