| // Copyright 2019 The LUCI Authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package base |
| |
| import ( |
| "fmt" |
| |
| "go.chromium.org/luci/auth" |
| "go.chromium.org/luci/common/errors" |
| |
| "go.chromium.org/luci/lucicfg" |
| ) |
| |
| // CollectErrorMessages traverses err (which can be a MultiError, recursively), |
| // and appends all error messages there to 'in', returning the resulting slice. |
| // |
| // They are eventually used in JSON output and printed to stderr. |
| func CollectErrorMessages(err error, in []string) (out []string) { |
| out = in |
| if err == nil { |
| return |
| } |
| |
| if err == auth.ErrLoginRequired { |
| out = append(out, "Need to login first by running:\nlucicfg auth-login") |
| return |
| } |
| |
| switch e := err.(type) { |
| case lucicfg.BacktracableError: |
| out = append(out, e.Backtrace()) |
| case errors.MultiError: |
| for _, inner := range e { |
| out = CollectErrorMessages(inner, out) |
| } |
| default: |
| out = append(out, fmt.Sprintf("Error: %s", err)) |
| } |
| return |
| } |