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error.go
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error.go
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// Copyright (c) 2020 The Decred developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package gcs
// ErrorKind identifies a kind of error. It has full support for errors.Is and
// errors.As, so the caller can directly check against an error kind when
// determining the reason for an error.
type ErrorKind string
// These constants are used to identify a specific RuleError.
const (
// ErrNTooBig signifies that the filter can't handle N items.
ErrNTooBig = ErrorKind("ErrNTooBig")
// ErrPTooBig signifies that the filter can't handle `1/2**P`
// collision probability.
ErrPTooBig = ErrorKind("ErrPTooBig")
// ErrBTooBig signifies that the provided Golomb coding bin size is larger
// than the maximum allowed value.
ErrBTooBig = ErrorKind("ErrBTooBig")
// ErrMisserialized signifies a filter was misserialized and is missing the
// N and/or P parameters of a serialized filter.
ErrMisserialized = ErrorKind("ErrMisserialized")
)
// Error satisfies the error interface and prints human-readable errors.
func (e ErrorKind) Error() string {
return string(e)
}
// Error identifies an error related to gcs filters. It has full support for
// errors.Is and errors.As, so the caller can ascertain the specific reason
// for the error by checking the underlying error.
type Error struct {
Err error
Description string
}
// Error satisfies the error interface and prints human-readable errors.
func (e Error) Error() string {
return e.Description
}
// Unwrap returns the underlying wrapped error.
func (e Error) Unwrap() error {
return e.Err
}
// makeError creates an Error given a set of arguments.
func makeError(kind ErrorKind, desc string) Error {
return Error{Err: kind, Description: desc}
}