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43 lines
1.1 KiB
Go
43 lines
1.1 KiB
Go
package errors
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// ErrorGroup is an interface for multiple errors that are not a chain.
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// This happens for example when executing multiple operations in parallel.
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type ErrorGroup interface {
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Errors() []error
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}
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// Errors uses the ErrorGroup interface to return a slice of errors.
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// If the ErrorGroup interface is not implemented it returns an array containing just the given error.
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func Errors(err error) []error {
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if eg, ok := err.(ErrorGroup); ok {
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return eg.Errors()
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}
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return []error{err}
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}
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// WalkDeep does a depth-first traversal of all errors.
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// Any ErrorGroup is traversed (after going deep).
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// The visitor function can return true to end the traversal early
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// In that case, WalkDeep will return true, otherwise false.
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func WalkDeep(err error, visitor func(err error) bool) bool {
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// Go deep
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unErr := err
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for unErr != nil {
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if done := visitor(unErr); done {
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return true
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}
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unErr = Unwrap(unErr)
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}
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// Go wide
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if group, ok := err.(ErrorGroup); ok {
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for _, err := range group.Errors() {
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if early := WalkDeep(err, visitor); early {
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return true
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}
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}
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}
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return false
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}
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