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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.
#ifndef CONTENT_BROWSER_PLUGIN_LOADER_POSIX_H_
#define CONTENT_BROWSER_PLUGIN_LOADER_POSIX_H_
#include <deque>
#include <vector>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/ref_counted.h"
#include "base/time/time.h"
#include "content/browser/plugin_service_impl.h"
#include "content/public/browser/utility_process_host_client.h"
#include "content/public/common/webplugininfo.h"
#include "ipc/ipc_sender.h"
namespace base {
class MessageLoopProxy;
}
namespace content {
class UtilityProcessHost;
// This class is responsible for managing the out-of-process plugin loading on
// POSIX systems. It primarily lives on the IO thread, but has a brief stay on
// the FILE thread to iterate over plugin directories when it is first
// constructed.
//
// The following is the algorithm used to load plugins:
// 1. This asks the PluginList for the list of all potential plugins to attempt
// to load. This is referred to as the canonical list.
// 2. The child process this hosts is forked and the canonical list is sent to
// it.
// 3. The child process iterates over the canonical list, attempting to load
// each plugin in the order specified by the list. It sends an IPC message
// to the browser after each load, indicating success or failure. The two
// processes synchronize the position in the vector that will be used to
// attempt to load the next plugin.
// 4. If the child dies during this process, the host forks another child and
// resumes loading at the position past the plugin that it just attempted to
// load, bypassing the problematic plugin.
// 5. This algorithm continues until the canonical list has been walked to the
// end, after which the list of loaded plugins is set on the PluginList and
// the completion callback is run.
class CONTENT_EXPORT PluginLoaderPosix
: public NON_EXPORTED_BASE(UtilityProcessHostClient),
public IPC::Sender {
public:
PluginLoaderPosix();
// Must be called from the IO thread.
void LoadPlugins(
scoped_refptr<base::MessageLoopProxy> target_loop,
const PluginService::GetPluginsCallback& callback);
// UtilityProcessHostClient:
virtual void OnProcessCrashed(int exit_code) OVERRIDE;
virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
// IPC::Sender:
virtual bool Send(IPC::Message* msg) OVERRIDE;
private:
struct PendingCallback {
PendingCallback(scoped_refptr<base::MessageLoopProxy> target_loop,
const PluginService::GetPluginsCallback& callback);
~PendingCallback();
scoped_refptr<base::MessageLoopProxy> target_loop;
PluginService::GetPluginsCallback callback;
};
virtual ~PluginLoaderPosix();
// Called on the FILE thread to get the list of plugin paths to probe.
void GetPluginsToLoad();
// Must be called on the IO thread.
virtual void LoadPluginsInternal();
// Message handlers.
void OnPluginLoaded(uint32 index, const WebPluginInfo& plugin);
void OnPluginLoadFailed(uint32 index, const base::FilePath& plugin_path);
// Checks if the plugin path is an internal plugin, and, if it is, adds it to
// |loaded_plugins_|.
bool MaybeAddInternalPlugin(const base::FilePath& plugin_path);
// Runs all the registered callbacks on each's target loop if the condition
// for ending the load process is done (i.e. the |next_load_index_| is outside
// the range of the |canonical_list_|).
bool MaybeRunPendingCallbacks();
// The process host for which this is a client.
base::WeakPtr<UtilityProcessHost> process_host_;
// A list of paths to plugins which will be loaded by the utility process, in
// the order specified by this vector.
std::vector<base::FilePath> canonical_list_;
// The index in |canonical_list_| of the plugin that the child process will
// attempt to load next.
size_t next_load_index_;
// Internal plugins that have been registered at the time of loading.
std::vector<WebPluginInfo> internal_plugins_;
// A vector of plugins that have been loaded successfully.
std::vector<WebPluginInfo> loaded_plugins_;
// The callback and message loop on which the callback will be run when the
// plugin loading process has been completed.
std::deque<PendingCallback> callbacks_;
// The time at which plugin loading started.
base::TimeTicks load_start_time_;
friend class MockPluginLoaderPosix;
DISALLOW_COPY_AND_ASSIGN(PluginLoaderPosix);
};
} // namespace content
#endif // CONTENT_BROWSER_PLUGIN_LOADER_POSIX_H_
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