| //go:build !go1.21 |
| // +build !go1.21 |
| |
| /* |
| Copyright 2019 The logr 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 logr |
| |
| import ( |
| "context" |
| ) |
| |
| // FromContext returns a Logger from ctx or an error if no Logger is found. |
| func FromContext(ctx context.Context) (Logger, error) { |
| if v, ok := ctx.Value(contextKey{}).(Logger); ok { |
| return v, nil |
| } |
| |
| return Logger{}, notFoundError{} |
| } |
| |
| // FromContextOrDiscard returns a Logger from ctx. If no Logger is found, this |
| // returns a Logger that discards all log messages. |
| func FromContextOrDiscard(ctx context.Context) Logger { |
| if v, ok := ctx.Value(contextKey{}).(Logger); ok { |
| return v |
| } |
| |
| return Discard() |
| } |
| |
| // NewContext returns a new Context, derived from ctx, which carries the |
| // provided Logger. |
| func NewContext(ctx context.Context, logger Logger) context.Context { |
| return context.WithValue(ctx, contextKey{}, logger) |
| } |