Source/WebKit/NetworkProcess/NetworkBroadcastChannelRegistry.cpp

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#include "config.h"
#include "NetworkBroadcastChannelRegistry.h"

#include "WebBroadcastChannelRegistryMessages.h"
#include <WebCore/MessageWithMessagePorts.h>
#include <wtf/CallbackAggregator.h>

namespace WebKit {

NetworkBroadcastChannelRegistry::NetworkBroadcastChannelRegistry() = default;

void NetworkBroadcastChannelRegistry::registerChannel(IPC::Connection& connection, const WebCore::ClientOrigin& origin, const String& name)
{
    auto& channelsForOrigin = m_broadcastChannels.ensure(origin, [] { return NameToConnectionIdentifiersMap { }; }).iterator->value;
    auto& connectionIdentifiersForName = channelsForOrigin.ensure(name, [] { return Vector<IPC::Connection::UniqueID> { }; }).iterator->value;
    ASSERT(!connectionIdentifiersForName.contains(connection.uniqueID()));
    connectionIdentifiersForName.append(connection.uniqueID());
}

void NetworkBroadcastChannelRegistry::unregisterChannel(IPC::Connection& connection, const WebCore::ClientOrigin& origin, const String& name)
{
    auto channelsForOriginIterator = m_broadcastChannels.find(origin);
    ASSERT(channelsForOriginIterator != m_broadcastChannels.end());
    if (channelsForOriginIterator == m_broadcastChannels.end())
        return;
    auto connectionIdentifiersForNameIterator = channelsForOriginIterator->value.find(name);
    ASSERT(connectionIdentifiersForNameIterator != channelsForOriginIterator->value.end());
    if (connectionIdentifiersForNameIterator == channelsForOriginIterator->value.end())
        return;

    ASSERT(connectionIdentifiersForNameIterator->value.contains(connection.uniqueID()));
    connectionIdentifiersForNameIterator->value.removeFirst(connection.uniqueID());
}

void NetworkBroadcastChannelRegistry::postMessage(IPC::Connection& connection, const WebCore::ClientOrigin& origin, const String& name, WebCore::MessageWithMessagePorts&& message, CompletionHandler<void()>&& completionHandler)
{
    auto channelsForOriginIterator = m_broadcastChannels.find(origin);
    ASSERT(channelsForOriginIterator != m_broadcastChannels.end());
    if (channelsForOriginIterator == m_broadcastChannels.end())
        return completionHandler();
    auto connectionIdentifiersForNameIterator = channelsForOriginIterator->value.find(name);
    ASSERT(connectionIdentifiersForNameIterator != channelsForOriginIterator->value.end());
    if (connectionIdentifiersForNameIterator == channelsForOriginIterator->value.end())
        return completionHandler();

    auto callbackAggregator = CallbackAggregator::create(WTFMove(completionHandler));
    for (auto& connectionID : connectionIdentifiersForNameIterator->value) {
        // Only dispatch the post the messages to BroadcastChannels outside the source process.
        if (connectionID == connection.uniqueID())
            continue;

        RefPtr connection = IPC::Connection::connection(connectionID);
        if (!connection)
            continue;

        connection->sendWithAsyncReply(Messages::WebBroadcastChannelRegistry::PostMessageToRemote(origin, name, message), [callbackAggregator] { }, 0);
    }
}

void NetworkBroadcastChannelRegistry::removeConnection(IPC::Connection& connection)
{
    Vector<WebCore::ClientOrigin> originsToRemove;
    for (auto& entry : m_broadcastChannels) {
        Vector<String> namesToRemove;
        for (auto& innerEntry : entry.value) {
            innerEntry.value.removeFirst(connection.uniqueID());
            if (innerEntry.value.isEmpty())
                namesToRemove.append(innerEntry.key);
        }
        for (auto& nameToRemove : namesToRemove)
            entry.value.remove(nameToRemove);
        if (entry.value.isEmpty())
            originsToRemove.append(entry.key);
    }
    for (auto& originToRemove : originsToRemove)
        m_broadcastChannels.remove(originToRemove);
}

} // namespace WebKit