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context.go
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context.go
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// SPDX-License-Identifier: BSD-3-Clause
// Copyright (c) 2022, Unikraft GmbH and The KraftKit Authors.
// Licensed under the BSD-3-Clause License (the "License").
// You may not use this file except in compliance with the License.
package config
import (
"context"
)
// contextKey is used to retrieve the logger from the context.
type contextKey struct{}
// WithConfigManager returns a new context with the provided logger. Use in
// combination with logger.WithField(s) for great effect.
func WithConfigManager[C any](ctx context.Context, cfgm *ConfigManager[C]) context.Context {
return context.WithValue(ctx, contextKey{}, cfgm)
}
// FromContext returns the Config Manager for kraftkit in the context, or an
// inert configuration that results in default values.
func M[T any](ctx context.Context) *ConfigManager[T] {
l := ctx.Value(contextKey{})
if l == nil {
l, _ := NewConfigManager(new(T))
return l
}
return l.(*ConfigManager[T])
}
// ConfigFromContext returns the config for kraftkit in the context, or an inert
// configuration that results in default values.
func G[T any](ctx context.Context) *T {
return M[T](ctx).Config
}