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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/broadcast_channel/broadcast_channel_service.h"
#include "base/functional/bind.h"
#include "base/memory/raw_ptr.h"
#include "content/browser/broadcast_channel/broadcast_channel_provider.h"
#include "mojo/public/cpp/bindings/associated_receiver.h"
#include "mojo/public/cpp/bindings/associated_remote.h"
#include "third_party/blink/public/mojom/broadcastchannel/broadcast_channel.mojom.h"
namespace content {
// There is a one-to-one mapping of BroadcastChannel instances in the renderer
// and Connection instances in the browser. The Connection is owned by a
// BroadcastChannelService.
class BroadcastChannelService::Connection
: public blink::mojom::BroadcastChannelClient {
public:
Connection(
const blink::StorageKey& storage_key,
const std::string& name,
mojo::PendingAssociatedRemote<blink::mojom::BroadcastChannelClient>
client,
mojo::PendingAssociatedReceiver<blink::mojom::BroadcastChannelClient>
connection,
BroadcastChannelService* service);
void OnMessage(blink::CloneableMessage message) override;
void MessageToClient(const blink::CloneableMessage& message) const {
client_->OnMessage(message.ShallowClone());
}
const blink::StorageKey& storage_key() const { return storage_key_; }
const std::string& name() const { return name_; }
void set_connection_error_handler(
const base::RepeatingClosure& error_handler) {
receiver_.set_disconnect_handler(error_handler);
client_.set_disconnect_handler(error_handler);
}
private:
mojo::AssociatedReceiver<blink::mojom::BroadcastChannelClient> receiver_;
mojo::AssociatedRemote<blink::mojom::BroadcastChannelClient> client_;
// Note: We use a raw pointer here because each Connection is owned by
// BroadcastChannelService, so the lifetime of each Connection object
// should not exceed the lifetime of `service_`.
raw_ptr<BroadcastChannelService> service_;
const blink::StorageKey storage_key_;
const std::string name_;
};
BroadcastChannelService::Connection::Connection(
const blink::StorageKey& storage_key,
const std::string& name,
mojo::PendingAssociatedRemote<blink::mojom::BroadcastChannelClient> client,
mojo::PendingAssociatedReceiver<blink::mojom::BroadcastChannelClient>
connection,
BroadcastChannelService* service)
: receiver_(this, std::move(connection)),
client_(std::move(client)),
service_(service),
storage_key_(storage_key),
name_(name) {}
void BroadcastChannelService::Connection::OnMessage(
blink::CloneableMessage message) {
service_->ReceivedMessageOnConnection(this, message);
}
BroadcastChannelService::BroadcastChannelService() = default;
BroadcastChannelService::~BroadcastChannelService() = default;
void BroadcastChannelService::UnregisterConnection(Connection* c) {
const auto key = std::make_pair(c->storage_key(), c->name());
for (auto it = connections_.lower_bound(key),
end = connections_.upper_bound(key);
it != end; ++it) {
if (it->second.get() == c) {
connections_.erase(it);
break;
}
}
}
void BroadcastChannelService::ReceivedMessageOnConnection(
Connection* c,
const blink::CloneableMessage& message) {
const auto key = std::make_pair(c->storage_key(), c->name());
for (auto it = connections_.lower_bound(key),
end = connections_.upper_bound(key);
it != end; ++it) {
if (it->second.get() != c)
it->second->MessageToClient(message);
}
}
void BroadcastChannelService::ConnectToChannel(
const blink::StorageKey& storage_key,
const std::string& name,
mojo::PendingAssociatedRemote<blink::mojom::BroadcastChannelClient> client,
mojo::PendingAssociatedReceiver<blink::mojom::BroadcastChannelClient>
connection) {
std::unique_ptr<Connection> c = std::make_unique<Connection>(
storage_key, name, std::move(client), std::move(connection), this);
c->set_connection_error_handler(
base::BindRepeating(&BroadcastChannelService::UnregisterConnection,
base::Unretained(this), c.get()));
connections_.emplace(std::make_pair(storage_key, name), std::move(c));
}
void BroadcastChannelService::AddReceiver(
std::unique_ptr<BroadcastChannelProvider> provider,
mojo::PendingReceiver<blink::mojom::BroadcastChannelProvider>
pending_receiver) {
receivers_.Add(std::move(provider), std::move(pending_receiver));
}
void BroadcastChannelService::AddAssociatedReceiver(
std::unique_ptr<BroadcastChannelProvider> provider,
mojo::PendingAssociatedReceiver<blink::mojom::BroadcastChannelProvider>
pending_associated_receiver) {
associated_receivers_.Add(std::move(provider),
std::move(pending_associated_receiver));
}
} // namespace content
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