84 lines
2.2 KiB
Go
84 lines
2.2 KiB
Go
//go:build go1.21
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// +build go1.21
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/*
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Copyright 2019 The logr Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package logr
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import (
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"context"
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"fmt"
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"log/slog"
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)
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// FromContext returns a Logger from ctx or an error if no Logger is found.
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func FromContext(ctx context.Context) (Logger, error) {
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v := ctx.Value(contextKey{})
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if v == nil {
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return Logger{}, notFoundError{}
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}
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switch v := v.(type) {
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case Logger:
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return v, nil
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case *slog.Logger:
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return FromSlogHandler(v.Handler()), nil
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default:
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// Not reached.
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panic(fmt.Sprintf("unexpected value type for logr context key: %T", v))
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}
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}
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// FromContextAsSlogLogger returns a slog.Logger from ctx or nil if no such Logger is found.
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func FromContextAsSlogLogger(ctx context.Context) *slog.Logger {
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v := ctx.Value(contextKey{})
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if v == nil {
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return nil
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}
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switch v := v.(type) {
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case Logger:
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return slog.New(ToSlogHandler(v))
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case *slog.Logger:
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return v
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default:
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// Not reached.
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panic(fmt.Sprintf("unexpected value type for logr context key: %T", v))
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}
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}
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// FromContextOrDiscard returns a Logger from ctx. If no Logger is found, this
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// returns a Logger that discards all log messages.
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func FromContextOrDiscard(ctx context.Context) Logger {
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if logger, err := FromContext(ctx); err == nil {
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return logger
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}
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return Discard()
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}
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// NewContext returns a new Context, derived from ctx, which carries the
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// provided Logger.
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func NewContext(ctx context.Context, logger Logger) context.Context {
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return context.WithValue(ctx, contextKey{}, logger)
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}
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// NewContextWithSlogLogger returns a new Context, derived from ctx, which carries the
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// provided slog.Logger.
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func NewContextWithSlogLogger(ctx context.Context, logger *slog.Logger) context.Context {
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return context.WithValue(ctx, contextKey{}, logger)
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}
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