2fa366d6af
Updates the differ service to support calling and configuring multiple differs. The differs are configured as an ordered list of differs which will each be attempting until a supported differ is called. Additionally a not supported error type was added to allow differs to be selective of whether the differ arguments are supported by the differ. This error type corresponds to the GRPC unimplemented error. Signed-off-by: Derek McGowan <derek@mcgstyle.net>
60 lines
2.1 KiB
Go
60 lines
2.1 KiB
Go
// Package errdefs defines the common errors used throughout containerd
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// packages.
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//
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// Use with errors.Wrap and error.Wrapf to add context to an error.
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//
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// To detect an error class, use the IsXXX functions to tell whether an error
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// is of a certain type.
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//
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// The functions ToGRPC and FromGRPC can be used to map server-side and
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// client-side errors to the correct types.
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package errdefs
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import "github.com/pkg/errors"
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// Definitions of common error types used throughout containerd. All containerd
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// errors returned by most packages will map into one of these errors classes.
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// Packages should return errors of these types when they want to instruct a
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// client to take a particular action.
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//
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// For the most part, we just try to provide local grpc errors. Most conditions
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// map very well to those defined by grpc.
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var (
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ErrUnknown = errors.New("unknown") // used internally to represent a missed mapping.
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ErrInvalidArgument = errors.New("invalid argument")
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ErrNotFound = errors.New("not found")
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ErrAlreadyExists = errors.New("already exists")
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ErrFailedPrecondition = errors.New("failed precondition")
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ErrUnavailable = errors.New("unavailable")
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ErrNotSupported = errors.New("not supported") // represents not supported and unimplemented
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)
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func IsInvalidArgument(err error) bool {
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return errors.Cause(err) == ErrInvalidArgument
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}
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// IsNotFound returns true if the error is due to a missing object
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func IsNotFound(err error) bool {
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return errors.Cause(err) == ErrNotFound
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}
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// IsAlreadyExists returns true if the error is due to an already existing
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// metadata item
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func IsAlreadyExists(err error) bool {
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return errors.Cause(err) == ErrAlreadyExists
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}
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// IsFailedPrecondition returns true if an operation could not proceed to the
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// lack of a particular condition.
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func IsFailedPrecondition(err error) bool {
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return errors.Cause(err) == ErrFailedPrecondition
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}
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func IsUnavailable(err error) bool {
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return errors.Cause(err) == ErrUnavailable
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}
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func IsNotSupported(err error) bool {
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return errors.Cause(err) == ErrNotSupported
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}
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