DownloadStream.h

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/*
 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *     http://aws.amazon.com/apache2.0/
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */

#ifndef ACSDKASSETSCOMMON_DOWNLOADSTREAM_H_
#define ACSDKASSETSCOMMON_DOWNLOADSTREAM_H_

#include <fstream>
#include <memory>
#include <mutex>
#include <string>

namespace alexaClientSDK {
namespace acsdkAssets {
namespace common {

/*
 * Consumer Producer queue with blocking wait and pop operation to store downloaded data chunks.
 * It comes with downloaded file size validation.
 */
class DownloadStream {
public:
    static std::shared_ptr<DownloadStream> create(const std::string& path, size_t expectedSize);

    virtual ~DownloadStream();

    bool write(const char* data, size_t size);

    bool downloadSucceeded() const;

private:
    explicit DownloadStream(const std::string& path, size_t expectedSize);

    bool good() const;

    mutable std::mutex m_mutex;

    std::ofstream m_ostream;

    size_t m_expectedSize;

    size_t m_downloadedSize;
};

}  // namespace common
}  // namespace acsdkAssets
}  // namespace alexaClientSDK

#endif  // ACSDKASSETSCOMMON_DOWNLOADSTREAM_H_