gecko-dev/remote/startup/RemoteAgentHandler.cpp
Andreas Tolfsen 36f394af15 bug 1543115: remote, toolkit: bootstrap from Rust; r=remote-protocol-reviewers,maja_zf
This bootstraps the remote agent from Rust so that we have access
to write to stderr using the eprintln!() macro.  There is a future
intention to expand Rust usage in the remote agent by delegating
CDP and WebDriver Bi-Di protocol schema validation to serde.

The Rust port is faithful to the JS version in terms of functionality,
and in some places improves on the original design by enforcing
a strict division between flag handling code on one hand, and the
remote agent server on the other.

Differential Revision: https://phabricator.services.mozilla.com/D50289

--HG--
extra : moz-landing-system : lando
2019-11-22 08:03:21 +00:00

37 lines
1.0 KiB
C++

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/StaticPtr.h"
#include "nsCOMPtr.h"
#include "nsICommandLineHandler.h"
#include "nsISupportsUtils.h"
#include "RemoteAgentHandler.h"
// anonymous namespace prevents outside C++ code
// from improperly accessing these implementation details
namespace {
extern "C" {
// implemented in Rust, see handler.rs
void new_remote_agent_handler(nsICommandLineHandler** result);
}
static mozilla::StaticRefPtr<nsICommandLineHandler> sHandler;
} // namespace
already_AddRefed<nsICommandLineHandler> GetRemoteAgentHandler() {
nsCOMPtr<nsICommandLineHandler> handler;
if (sHandler) {
handler = sHandler;
} else {
new_remote_agent_handler(getter_AddRefs(handler));
sHandler = handler;
mozilla::ClearOnShutdown(&sHandler);
}
return handler.forget();
}