| // Copyright (c) HashiCorp, Inc. |
| // SPDX-License-Identifier: BUSL-1.1 |
| |
| package promising |
| |
| // ErrUnresolved is the error type returned by a promise getter or a main |
| // task execution if a task fails to resolve all of the promises it is |
| // responsible for before it returns. |
| type ErrUnresolved []PromiseID |
| |
| func (err ErrUnresolved) Error() string { |
| return "promise unresolved" |
| } |
| |
| // ErrSelfDependent is the error type returned by a promise getter if the |
| // requesting task is depending on itself for its own progress, by trying |
| // to read a promise that it is either directly or indirectly responsible |
| // for resolving. |
| // |
| // The built-in error message is generic but callers can type-assert to |
| // this type to obtain the chain of promises that lead from the task |
| // to itself, possibly via other tasks that are themselves awaiting the |
| // caller to resolve a different promise. |
| type ErrSelfDependent []PromiseID |
| |
| func (err ErrSelfDependent) Error() string { |
| return "task is self-dependent" |
| } |
