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// Copyright (c) 2012 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 "ppapi/host/ppapi_host.h"
#include "base/logging.h"
#include "ppapi/c/pp_errors.h"
#include "ppapi/host/host_factory.h"
#include "ppapi/host/host_message_context.h"
#include "ppapi/host/instance_message_filter.h"
#include "ppapi/host/resource_host.h"
#include "ppapi/proxy/ppapi_messages.h"
#include "ppapi/proxy/resource_message_params.h"
#include "ppapi/shared_impl/host_resource.h"
namespace ppapi {
namespace host {
namespace {
// Put a cap on the maximum number of resources so we don't explode if the
// renderer starts spamming us.
const size_t kMaxResourcesPerPlugin = 1 << 14;
} // namespace
PpapiHost::PpapiHost(IPC::Sender* sender,
const PpapiPermissions& perms)
: sender_(sender),
permissions_(perms) {
}
PpapiHost::~PpapiHost() {
// Delete these explicitly before destruction since then the host is still
// technically alive in case one of the filters accesses us from the
// destructor.
instance_message_filters_.clear();
}
bool PpapiHost::Send(IPC::Message* msg) {
return sender_->Send(msg);
}
bool PpapiHost::OnMessageReceived(const IPC::Message& msg) {
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(PpapiHost, msg)
IPC_MESSAGE_HANDLER(PpapiHostMsg_ResourceCall,
OnHostMsgResourceCall)
IPC_MESSAGE_HANDLER_DELAY_REPLY(PpapiHostMsg_ResourceSyncCall,
OnHostMsgResourceSyncCall)
IPC_MESSAGE_HANDLER(PpapiHostMsg_ResourceCreated,
OnHostMsgResourceCreated)
IPC_MESSAGE_HANDLER(PpapiHostMsg_ResourceDestroyed,
OnHostMsgResourceDestroyed)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
if (!handled) {
for (size_t i = 0; i < instance_message_filters_.size(); i++) {
if (instance_message_filters_[i]->OnInstanceMessageReceived(msg)) {
handled = true;
break;
}
}
}
return handled;
}
void PpapiHost::SendReply(const ReplyMessageContext& context,
const IPC::Message& msg) {
if (context.sync_reply_msg) {
PpapiHostMsg_ResourceSyncCall::WriteReplyParams(context.sync_reply_msg,
context.params, msg);
Send(context.sync_reply_msg);
} else {
Send(new PpapiPluginMsg_ResourceReply(context.params, msg));
}
}
void PpapiHost::SendUnsolicitedReply(PP_Resource resource,
const IPC::Message& msg) {
proxy::ResourceMessageReplyParams params(resource, 0);
Send(new PpapiPluginMsg_ResourceReply(params, msg));
}
void PpapiHost::AddHostFactoryFilter(scoped_ptr<HostFactory> filter) {
host_factory_filters_.push_back(filter.release());
}
void PpapiHost::AddInstanceMessageFilter(
scoped_ptr<InstanceMessageFilter> filter) {
instance_message_filters_.push_back(filter.release());
}
void PpapiHost::OnHostMsgResourceCall(
const proxy::ResourceMessageCallParams& params,
const IPC::Message& nested_msg) {
HostMessageContext context(params);
HandleResourceCall(params, nested_msg, &context);
}
void PpapiHost::OnHostMsgResourceSyncCall(
const proxy::ResourceMessageCallParams& params,
const IPC::Message& nested_msg,
IPC::Message* reply_msg) {
// Sync messages should always have callback set because they always expect
// a reply from the host.
DCHECK(params.has_callback());
// Stash the |reply_msg| in the context so that it can be used to reply
// to the sync message.
HostMessageContext context(params, reply_msg);
HandleResourceCall(params, nested_msg, &context);
}
void PpapiHost::HandleResourceCall(
const proxy::ResourceMessageCallParams& params,
const IPC::Message& nested_msg,
HostMessageContext* context) {
ResourceHost* resource_host = GetResourceHost(params.pp_resource());
if (resource_host) {
resource_host->HandleMessage(nested_msg, context);
} else {
if (context->params.has_callback()) {
ReplyMessageContext reply_context = context->MakeReplyMessageContext();
reply_context.params.set_result(PP_ERROR_BADRESOURCE);
SendReply(reply_context, context->reply_msg);
}
}
}
void PpapiHost::OnHostMsgResourceCreated(
const proxy::ResourceMessageCallParams& params,
PP_Instance instance,
const IPC::Message& nested_msg) {
if (resources_.size() >= kMaxResourcesPerPlugin)
return;
// Run through all filters until one grabs this message.
scoped_ptr<ResourceHost> resource_host;
DCHECK(!host_factory_filters_.empty()); // Caller forgot to add a factory.
for (size_t i = 0; i < host_factory_filters_.size(); i++) {
resource_host = host_factory_filters_[i]->CreateResourceHost(
this, params, instance, nested_msg).Pass();
if (resource_host.get())
break;
}
if (!resource_host.get()) {
NOTREACHED();
return;
}
resources_[params.pp_resource()] =
linked_ptr<ResourceHost>(resource_host.release());
}
void PpapiHost::OnHostMsgResourceDestroyed(PP_Resource resource) {
ResourceMap::iterator found = resources_.find(resource);
if (found == resources_.end()) {
NOTREACHED();
return;
}
resources_.erase(found);
}
ResourceHost* PpapiHost::GetResourceHost(PP_Resource resource) const {
ResourceMap::const_iterator found = resources_.find(resource);
return found == resources_.end() ? NULL : found->second.get();
}
} // namespace host
} // namespace ppapi
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