// NewContext creates a new context with authInfo attached.
func NewContext(ctx context.Context, authInfo AuthInfo) context.Context {
return context.WithValue(ctx, authInfoKey{}, authInfo)
}
// newContextWithStream creates a new context from ctx and attaches stream
// to it.
func newContextWithStream(ctx context.Context, stream *Stream) context.Context {
return context.WithValue(ctx, streamKey, stream)
}
// NewContext returns a copy of the parent context
// and associates it with a Trace.
func NewContext(ctx context.Context, tr Trace) context.Context {
return context.WithValue(ctx, contextKey, tr)
}