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package errors
import (
"fmt"
"github.com/pkg/errors"
)
var (
errValidatorsChanged = fmt.Errorf("Validators differ between header and certifier")
errCommitNotFound = fmt.Errorf("Commit not found by provider")
errTooMuchChange = fmt.Errorf("Validators change too much to safely update")
errPastTime = fmt.Errorf("Update older than certifier height")
errNoPathFound = fmt.Errorf("Cannot find a path of validators")
)
// IsCommitNotFoundErr checks whether an error is due to missing data
func IsCommitNotFoundErr(err error) bool {
return err != nil && (errors.Cause(err) == errCommitNotFound)
}
func ErrCommitNotFound() error {
return errors.WithStack(errCommitNotFound)
}
// IsValidatorsChangedErr checks whether an error is due
// to a differing validator set
func IsValidatorsChangedErr(err error) bool {
return err != nil && (errors.Cause(err) == errValidatorsChanged)
}
func ErrValidatorsChanged() error {
return errors.WithStack(errValidatorsChanged)
}
// IsTooMuchChangeErr checks whether an error is due to too much change
// between these validators sets
func IsTooMuchChangeErr(err error) bool {
return err != nil && (errors.Cause(err) == errTooMuchChange)
}
func ErrTooMuchChange() error {
return errors.WithStack(errTooMuchChange)
}
func IsPastTimeErr(err error) bool {
return err != nil && (errors.Cause(err) == errPastTime)
}
func ErrPastTime() error {
return errors.WithStack(errPastTime)
}
// IsNoPathFoundErr checks whether an error is due to no path of
// validators in provider from where we are to where we want to be
func IsNoPathFoundErr(err error) bool {
return err != nil && (errors.Cause(err) == errNoPathFound)
}
func ErrNoPathFound() error {
return errors.WithStack(errNoPathFound)
}
//--------------------------------------------
type errHeightMismatch struct {
h1, h2 int
}
func (e errHeightMismatch) Error() string {
return fmt.Sprintf("Blocks don't match - %d vs %d", e.h1, e.h2)
}
// IsHeightMismatchErr checks whether an error is due to data from different blocks
func IsHeightMismatchErr(err error) bool {
if err == nil {
return false
}
_, ok := errors.Cause(err).(errHeightMismatch)
return ok
}
// ErrHeightMismatch returns an mismatch error with stack-trace
func ErrHeightMismatch(h1, h2 int) error {
return errors.WithStack(errHeightMismatch{h1, h2})
}