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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.
#ifndef CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SAFE_MEDIA_METADATA_PARSER_H_
#define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SAFE_MEDIA_METADATA_PARSER_H_
#include <string>
#include <vector>
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "chrome/common/extensions/api/media_galleries.h"
#include "chrome/common/media_galleries/metadata_types.h"
#include "content/public/browser/utility_process_host.h"
#include "content/public/browser/utility_process_host_client.h"
namespace IPC {
class Message;
}
class Profile;
namespace metadata {
// Parses the media metadata of a Blob safely in a utility process. This class
// expects the MIME type of the Blob to be already determined. It spawns a
// utility process to do further MIME-type specific metadata extraction.
// All public methods and callbacks of this class run on the UI thread.
class SafeMediaMetadataParser : public content::UtilityProcessHostClient {
public:
// |metadata_dictionary| is owned by the callback.
typedef base::Callback<
void(bool parse_success,
scoped_ptr<base::DictionaryValue> metadata_dictionary,
scoped_ptr<std::vector<AttachedImage> > attached_images)>
DoneCallback;
SafeMediaMetadataParser(Profile* profile, const std::string& blob_uuid,
int64 blob_size, const std::string& mime_type,
bool get_attached_images);
// Should be called on the UI thread. |callback| also runs on the UI thread.
void Start(const DoneCallback& callback);
private:
enum ParserState {
INITIAL_STATE,
STARTED_PARSING_STATE,
FINISHED_PARSING_STATE,
};
// Private because content::UtilityProcessHostClient is ref-counted.
virtual ~SafeMediaMetadataParser();
// Launches the utility process. Must run on the IO thread.
void StartWorkOnIOThread(const DoneCallback& callback);
// Notification from the utility process when it finishes parsing metadata.
// Runs on the IO thread.
void OnParseMediaMetadataFinished(
bool parse_success, const base::DictionaryValue& metadata_dictionary,
const std::vector<AttachedImage>& attached_images);
// Sequence of functions that bounces from the IO thread to the UI thread to
// read the blob data, then sends the data back to the utility process.
void OnUtilityProcessRequestBlobBytes(int64 request_id, int64 byte_start,
int64 length);
void StartBlobReaderOnUIThread(int64 request_id, int64 byte_start,
int64 length);
void OnBlobReaderDoneOnUIThread(int64 request_id,
scoped_ptr<std::string> data,
int64 /* blob_total_size */);
void FinishRequestBlobBytes(int64 request_id, scoped_ptr<std::string> data);
// UtilityProcessHostClient implementation.
// Runs on the IO thread.
virtual void OnProcessCrashed(int exit_code) OVERRIDE;
virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
// All member variables are only accessed on the IO thread.
Profile* const profile_;
const std::string blob_uuid_;
const int64 blob_size_;
const std::string mime_type_;
bool get_attached_images_;
DoneCallback callback_;
base::WeakPtr<content::UtilityProcessHost> utility_process_host_;
// Verifies the messages from the utility process came at the right time.
// Initialized on the UI thread, but only accessed on the IO thread.
ParserState parser_state_;
DISALLOW_COPY_AND_ASSIGN(SafeMediaMetadataParser);
};
} // namespace metadata
#endif // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SAFE_MEDIA_METADATA_PARSER_H_
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