FsUtils/amntfs/error.go

package amntfs

import "fmt"

type AMNTFSErrNo uint8

const (
	ErrChildFsError                     AMNTFSErrNo = iota
	ErrUnknownInternalError             AMNTFSErrNo = iota
	ErrMountPointAlreadyMounted         AMNTFSErrNo = iota
	ErrNoAvailableMountPointForThisPath AMNTFSErrNo = iota
)

func (e AMNTFSErrNo) Message() string {
	switch e {
	case ErrMountPointAlreadyMounted:
		return "mount point already mounted"
	case ErrUnknownInternalError:
		return "unknown internal error"
	case ErrNoAvailableMountPointForThisPath:
		return "no available mount point for this path"
	case ErrChildFsError:
		return "child filesystem error"
	default:
		return "unknown error"
	}
}

var _ error = (*AMNTFSError)(nil)

type AMNTFSError struct {
	etype   AMNTFSErrNo
	fstype  string
	mountid int64
	rawErr  error
}

func (e AMNTFSError) Error() string {
	if e.etype == ErrChildFsError {
		return fmt.Sprintf("%s [mid=0x%08X]: %s", e.fstype, e.mountid, e.rawErr.Error())
	}
	if e.rawErr == nil {
		return fmt.Sprintf("amntfs: %s", e.etype.Message())
	} else {
		return fmt.Sprintf("amntfs: %s: %s", e.etype.Message(), e.rawErr.Error())
	}
}

func (e AMNTFSError) GetRawError() error {
	return e.rawErr
}

func (e AMNTFSError) GetErrNo() AMNTFSErrNo {
	return e.etype
}

func (e AMNTFSError) GetFsType() string {
	return e.fstype
}

func (e AMNTFSError) GetMountId() int64 {
	return e.mountid
}

func (e AMNTFSError) GetFsDescription() string {
	return fmt.Sprintf("%s (mid=0x%08X)", e.fstype, e.mountid)
}

func NewAMNTFSError(emsg AMNTFSErrNo, rawErr error) *AMNTFSError {
	return &AMNTFSError{
		etype:   emsg,
		rawErr:  rawErr,
		fstype:  "",
		mountid: 0,
	}
}

func NewAMNTFSChildFsError(fsent *MountNode, rawErr error) *AMNTFSError {
	return &AMNTFSError{
		etype:   ErrChildFsError,
		rawErr:  rawErr,
		fstype:  fsent.FsType(),
		mountid: fsent.MountId(),
	}
}

func CheckErrorType(err error, errNo AMNTFSErrNo) bool {
	if err == nil {
		return false
	}
	switch err.(type) {
	case AMNTFSError:
		return err.(AMNTFSError).GetErrNo() == errNo
	default:
		return false
	}
}