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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
#ifndef mozilla_dom_RemoteWorkerManager_h
#define mozilla_dom_RemoteWorkerManager_h
#include "base/process.h"
#include "mozilla/RefPtr.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/RemoteWorkerTypes.h"
#include "mozilla/dom/WorkerPrivate.h" // WorkerKind enum
#include "nsISupportsImpl.h"
#include "nsTArray.h"
namespace mozilla::dom {
class RemoteWorkerController;
class RemoteWorkerServiceParent;
/**
* PBackground instance that keeps tracks of RemoteWorkerServiceParent actors
* (1 per process, including the main process) and pending
* RemoteWorkerController requests to spawn remote workers if the spawn request
* can't be immediately fulfilled. Decides which RemoteWorkerServerParent to use
* internally via SelectTargetActor in order to select a BackgroundParent
* manager on which to create a RemoteWorkerParent.
*/
class RemoteWorkerManager final {
public:
NS_INLINE_DECL_REFCOUNTING(RemoteWorkerManager)
static already_AddRefed<RemoteWorkerManager> GetOrCreate();
void RegisterActor(RemoteWorkerServiceParent* aActor);
void UnregisterActor(RemoteWorkerServiceParent* aActor);
void Launch(RemoteWorkerController* aController,
const RemoteWorkerData& aData, base::ProcessId aProcessId);
static bool MatchRemoteType(const nsACString& processRemoteType,
const nsACString& workerRemoteType);
/**
* Get the child process RemoteType where a RemoteWorker should be
* launched.
*/
static Result<nsCString, nsresult> GetRemoteType(
const nsCOMPtr<nsIPrincipal>& aPrincipal, WorkerKind aWorkerKind);
/**
* Verify if a remote worker should be allowed to run in the current
* child process remoteType.
*/
static bool IsRemoteTypeAllowed(const RemoteWorkerData& aData);
static bool HasExtensionPrincipal(const RemoteWorkerData& aData);
private:
RemoteWorkerManager();
~RemoteWorkerManager();
RemoteWorkerServiceParent* SelectTargetActor(const RemoteWorkerData& aData,
base::ProcessId aProcessId);
RemoteWorkerServiceParent* SelectTargetActorInternal(
const RemoteWorkerData& aData, base::ProcessId aProcessId) const;
void LaunchInternal(RemoteWorkerController* aController,
RemoteWorkerServiceParent* aTargetActor,
const RemoteWorkerData& aData,
bool aRemoteWorkerAlreadyRegistered = false);
void LaunchNewContentProcess(const RemoteWorkerData& aData);
void AsyncCreationFailed(RemoteWorkerController* aController);
// Iterate through all RemoteWorkerServiceParent actors with the given
// remoteType, starting from the actor related to a child process with pid
// aProcessId if needed and available or from a random index otherwise (as if
// iterating through a circular array).
//
// aCallback should be a invokable object with a function signature of
// bool (RemoteWorkerServiceParent*, RefPtr<ContentParent>&&)
//
// aCallback is called with the actor and corresponding ContentParent, should
// return false to abort iteration before all actors have been traversed (e.g.
// if the desired actor is found), and must not mutate mChildActors (which
// shouldn't be an issue because this function is const). aCallback also
// doesn't need to worry about proxy-releasing the ContentParent if it isn't
// moved out of the parameter.
template <typename Callback>
void ForEachActor(Callback&& aCallback, const nsACString& aRemoteType,
Maybe<base::ProcessId> aProcessId = Nothing()) const;
// The list of existing RemoteWorkerServiceParent actors for child processes.
// Raw pointers because RemoteWorkerServiceParent actors unregister themselves
// when destroyed.
// XXX For Fission, where we could have a lot of child actors, should we maybe
// instead keep either a hash table (PID->actor) or perhaps store the actors
// in order, sorted by PID, to avoid linear lookup times?
nsTArray<RemoteWorkerServiceParent*> mChildActors;
RemoteWorkerServiceParent* mParentActor;
struct Pending {
RefPtr<RemoteWorkerController> mController;
RemoteWorkerData mData;
};
nsTArray<Pending> mPendings;
};
} // namespace mozilla::dom
#endif // mozilla_dom_RemoteWorkerManager_h
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