75 lines
1.8 KiB
C++
75 lines
1.8 KiB
C++
// Copyright (c) 2016 GitHub, Inc.
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// Use of this source code is governed by the MIT license that can be
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// found in the LICENSE file.
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#ifndef ATOM_BROWSER_ATOM_BLOB_READER_H_
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#define ATOM_BROWSER_ATOM_BLOB_READER_H_
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#include <memory>
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#include <string>
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#include "atom/common/promise_util.h"
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#include "base/callback.h"
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namespace content {
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class ChromeBlobStorageContext;
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}
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namespace net {
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class IOBuffer;
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}
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namespace storage {
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class BlobDataHandle;
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class BlobReader;
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} // namespace storage
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namespace v8 {
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template <class T>
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class Local;
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class Value;
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} // namespace v8
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namespace atom {
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// A class to keep track of the blob context. All methods,
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// except Ctor are expected to be called on IO thread.
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class AtomBlobReader {
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public:
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explicit AtomBlobReader(content::ChromeBlobStorageContext* blob_context);
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~AtomBlobReader();
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void StartReading(const std::string& uuid, atom::util::Promise promise);
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private:
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// A self-destroyed helper class to read the blob data.
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// Must be accessed on IO thread.
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class BlobReadHelper {
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public:
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using CompletionCallback = base::OnceCallback<void(char*, int)>;
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BlobReadHelper(std::unique_ptr<storage::BlobReader> blob_reader,
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BlobReadHelper::CompletionCallback callback);
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~BlobReadHelper();
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void Read();
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private:
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void DidCalculateSize(int result);
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void DidReadBlobData(const scoped_refptr<net::IOBuffer>& blob_data,
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int bytes_read);
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std::unique_ptr<storage::BlobReader> blob_reader_;
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BlobReadHelper::CompletionCallback completion_callback_;
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DISALLOW_COPY_AND_ASSIGN(BlobReadHelper);
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};
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scoped_refptr<content::ChromeBlobStorageContext> blob_context_;
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DISALLOW_COPY_AND_ASSIGN(AtomBlobReader);
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};
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} // namespace atom
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#endif // ATOM_BROWSER_ATOM_BLOB_READER_H_
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