bouncer/internal/proxy/director/context.go

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2023-04-24 20:52:12 +02:00
package director
import (
"context"
"forge.cadoles.com/cadoles/bouncer/internal/store"
"github.com/pkg/errors"
)
type contextKey string
const (
contextKeyProxy contextKey = "proxy"
contextKeyLayers contextKey = "layers"
)
var (
errContextKeyNotFound = errors.New("context key not found")
errUnexpectedContextValue = errors.New("unexpected context value")
)
func withProxy(ctx context.Context, proxy *store.Proxy) context.Context {
return context.WithValue(ctx, contextKeyProxy, proxy)
}
func ctxProxy(ctx context.Context) (*store.Proxy, error) {
proxy, err := ctxValue[*store.Proxy](ctx, contextKeyProxy)
if err != nil {
return nil, errors.WithStack(err)
}
return proxy, nil
}
func withLayers(ctx context.Context, layers []*store.Layer) context.Context {
return context.WithValue(ctx, contextKeyLayers, layers)
}
func ctxLayers(ctx context.Context) ([]*store.Layer, error) {
layers, err := ctxValue[[]*store.Layer](ctx, contextKeyLayers)
if err != nil {
return nil, errors.WithStack(err)
}
return layers, nil
}
func ctxValue[T any](ctx context.Context, key contextKey) (T, error) {
raw := ctx.Value(key)
if raw == nil {
return *new(T), errors.WithStack(errContextKeyNotFound)
}
value, ok := raw.(T)
if !ok {
return *new(T), errors.WithStack(errUnexpectedContextValue)
}
return value, nil
}