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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "extensions/browser/mojo/stash_backend.h"
#include <stddef.h>
#include <utility>
#include <vector>
#include "base/bind.h"
#include "base/macros.h"
#include "mojo/message_pump/handle_watcher.h"
#include "mojo/public/cpp/bindings/strong_binding.h"
namespace extensions {
namespace {
// An implementation of StashService that forwards calls to a StashBackend.
class StashServiceImpl : public StashService {
public:
StashServiceImpl(mojo::InterfaceRequest<StashService> request,
base::WeakPtr<StashBackend> backend);
~StashServiceImpl() override;
// StashService overrides.
void AddToStash(mojo::Array<StashedObjectPtr> stash) override;
void RetrieveStash(
const mojo::Callback<void(mojo::Array<StashedObjectPtr> stash)>& callback)
override;
private:
mojo::StrongBinding<StashService> binding_;
base::WeakPtr<StashBackend> backend_;
DISALLOW_COPY_AND_ASSIGN(StashServiceImpl);
};
StashServiceImpl::StashServiceImpl(mojo::InterfaceRequest<StashService> request,
base::WeakPtr<StashBackend> backend)
: binding_(this, std::move(request)), backend_(backend) {}
StashServiceImpl::~StashServiceImpl() {
}
void StashServiceImpl::AddToStash(
mojo::Array<StashedObjectPtr> stashed_objects) {
if (!backend_)
return;
backend_->AddToStash(std::move(stashed_objects));
}
void StashServiceImpl::RetrieveStash(
const mojo::Callback<void(mojo::Array<StashedObjectPtr>)>& callback) {
if (!backend_) {
callback.Run(mojo::Array<StashedObjectPtr>());
return;
}
callback.Run(backend_->RetrieveStash());
}
} // namespace
// A stash entry for a stashed object. This handles notifications if a handle
// within the stashed object is readable.
class StashBackend::StashEntry {
public:
// Construct a StashEntry for |stashed_object|. If |on_handle_readable| is
// non-null, it will be invoked when any handle on |stashed_object| is
// readable.
StashEntry(StashedObjectPtr stashed_object,
const base::Closure& on_handle_readable);
~StashEntry();
// Returns the stashed object.
StashedObjectPtr Release();
// Cancels notifications for handles becoming readable.
void CancelHandleNotifications();
private:
// Invoked when a handle within |stashed_object_| is readable.
void OnHandleReady(MojoResult result);
// The waiters that are waiting for handles to be readable.
std::vector<scoped_ptr<mojo::common::HandleWatcher>> waiters_;
StashedObjectPtr stashed_object_;
// If non-null, a callback to call when a handle contained within
// |stashed_object_| is readable.
const base::Closure on_handle_readable_;
};
StashBackend::StashBackend(const base::Closure& on_handle_readable)
: on_handle_readable_(on_handle_readable),
has_notified_(false),
weak_factory_(this) {
}
StashBackend::~StashBackend() {
}
void StashBackend::AddToStash(mojo::Array<StashedObjectPtr> stashed_objects) {
for (size_t i = 0; i < stashed_objects.size(); i++) {
stashed_objects_.push_back(make_scoped_ptr(new StashEntry(
std::move(stashed_objects[i]),
has_notified_ ? base::Closure()
: base::Bind(&StashBackend::OnHandleReady,
weak_factory_.GetWeakPtr()))));
}
}
mojo::Array<StashedObjectPtr> StashBackend::RetrieveStash() {
has_notified_ = false;
mojo::Array<StashedObjectPtr> result;
for (auto& entry : stashed_objects_) {
result.push_back(entry->Release());
}
stashed_objects_.clear();
return result;
}
void StashBackend::BindToRequest(mojo::InterfaceRequest<StashService> request) {
new StashServiceImpl(std::move(request), weak_factory_.GetWeakPtr());
}
void StashBackend::OnHandleReady() {
DCHECK(!has_notified_);
has_notified_ = true;
for (auto& entry : stashed_objects_) {
entry->CancelHandleNotifications();
}
if (!on_handle_readable_.is_null())
on_handle_readable_.Run();
}
StashBackend::StashEntry::StashEntry(StashedObjectPtr stashed_object,
const base::Closure& on_handle_readable)
: stashed_object_(std::move(stashed_object)),
on_handle_readable_(on_handle_readable) {
if (on_handle_readable_.is_null() || !stashed_object_->monitor_handles)
return;
for (size_t i = 0; i < stashed_object_->stashed_handles.size(); i++) {
scoped_ptr<mojo::common::HandleWatcher> watcher(
new mojo::common::HandleWatcher());
watcher->Start(stashed_object_->stashed_handles[i].get(),
MOJO_HANDLE_SIGNAL_READABLE, MOJO_DEADLINE_INDEFINITE,
base::Bind(&StashBackend::StashEntry::OnHandleReady,
base::Unretained(this)));
waiters_.push_back(std::move(watcher));
}
}
StashBackend::StashEntry::~StashEntry() {
}
StashedObjectPtr StashBackend::StashEntry::Release() {
waiters_.clear();
return std::move(stashed_object_);
}
void StashBackend::StashEntry::CancelHandleNotifications() {
waiters_.clear();
}
void StashBackend::StashEntry::OnHandleReady(MojoResult result) {
if (result != MOJO_RESULT_OK)
return;
on_handle_readable_.Run();
}
} // namespace extensions
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