59854e407d
The types defined in the errdefs package do not
satisfy the `error` interface, because they do not
implement `Error()`.
Instead of returning the matched interface, return
the original error.
When matching _multiple_ interfaces/types, Golang doesn't complain:
func getImplementer(err error) error {
switch e := err.(type) {
case
ErrNotFound,
ErrInvalidParameter:
return e
default:
return err
}
}
But matching a single interface/type:
func getImplementer(err error) error {
switch e := err.(type) {
case
ErrNotFound:
return e
default:
return err
}
}
Produces an error:
cannot use e (type ErrNotFound) as type error in return argument: ErrNotFound does not implement error (missing Error method)
Return the original `err` instead of the matched interface/type instead.
Also added some additional tests
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
114 lines
2.7 KiB
Go
114 lines
2.7 KiB
Go
package errdefs // import "github.com/docker/docker/errdefs"
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type causer interface {
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Cause() error
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}
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func getImplementer(err error) error {
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switch e := err.(type) {
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case
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ErrNotFound,
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ErrInvalidParameter,
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ErrConflict,
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ErrUnauthorized,
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ErrUnavailable,
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ErrForbidden,
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ErrSystem,
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ErrNotModified,
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ErrAlreadyExists,
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ErrNotImplemented,
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ErrCancelled,
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ErrDeadline,
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ErrDataLoss,
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ErrUnknown:
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return err
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case causer:
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return getImplementer(e.Cause())
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default:
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return err
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}
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}
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// IsNotFound returns if the passed in error is an ErrNotFound
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func IsNotFound(err error) bool {
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_, ok := getImplementer(err).(ErrNotFound)
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return ok
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}
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// IsInvalidParameter returns if the passed in error is an ErrInvalidParameter
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func IsInvalidParameter(err error) bool {
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_, ok := getImplementer(err).(ErrInvalidParameter)
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return ok
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}
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// IsConflict returns if the passed in error is an ErrConflict
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func IsConflict(err error) bool {
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_, ok := getImplementer(err).(ErrConflict)
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return ok
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}
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// IsUnauthorized returns if the the passed in error is an ErrUnauthorized
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func IsUnauthorized(err error) bool {
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_, ok := getImplementer(err).(ErrUnauthorized)
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return ok
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}
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// IsUnavailable returns if the passed in error is an ErrUnavailable
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func IsUnavailable(err error) bool {
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_, ok := getImplementer(err).(ErrUnavailable)
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return ok
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}
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// IsForbidden returns if the passed in error is an ErrForbidden
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func IsForbidden(err error) bool {
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_, ok := getImplementer(err).(ErrForbidden)
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return ok
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}
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// IsSystem returns if the passed in error is an ErrSystem
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func IsSystem(err error) bool {
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_, ok := getImplementer(err).(ErrSystem)
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return ok
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}
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// IsNotModified returns if the passed in error is a NotModified error
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func IsNotModified(err error) bool {
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_, ok := getImplementer(err).(ErrNotModified)
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return ok
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}
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// IsAlreadyExists returns if the passed in error is a AlreadyExists error
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func IsAlreadyExists(err error) bool {
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_, ok := getImplementer(err).(ErrAlreadyExists)
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return ok
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}
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// IsNotImplemented returns if the passed in error is an ErrNotImplemented
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func IsNotImplemented(err error) bool {
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_, ok := getImplementer(err).(ErrNotImplemented)
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return ok
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}
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// IsUnknown returns if the passed in error is an ErrUnknown
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func IsUnknown(err error) bool {
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_, ok := getImplementer(err).(ErrUnknown)
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return ok
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}
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// IsCancelled returns if the passed in error is an ErrCancelled
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func IsCancelled(err error) bool {
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_, ok := getImplementer(err).(ErrCancelled)
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return ok
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}
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// IsDeadline returns if the passed in error is an ErrDeadline
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func IsDeadline(err error) bool {
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_, ok := getImplementer(err).(ErrDeadline)
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return ok
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}
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// IsDataLoss returns if the passed in error is an ErrDataLoss
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func IsDataLoss(err error) bool {
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_, ok := getImplementer(err).(ErrDataLoss)
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return ok
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}
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