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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_INDEXED_DB_INSTANCE_SQLITE_BLOB_WRITER_H_
#define CONTENT_BROWSER_INDEXED_DB_INSTANCE_SQLITE_BLOB_WRITER_H_
#include <memory>
#include "base/functional/callback.h"
#include "mojo/public/cpp/system/data_pipe_drainer.h"
#include "sql/streaming_blob_handle.h"
namespace content::indexed_db {
class IndexedDBExternalObject;
namespace sqlite {
// This class reads all the data from a mojo Blob and writes it into the
// provided SQL address. It is owned by the DatabaseConnection.
class BlobWriter : public mojo::DataPipeDrainer::Client {
public:
// Will return null if there's a synchronous error (a mojo pipe couldn't be
// created due to insufficient resources), in which case `on_complete` is
// never called.
static std::unique_ptr<BlobWriter> WriteBlobIntoDatabase(
// Contains a mojo Blob connection from which bytes are read.
IndexedDBExternalObject& external_object,
// The destination for the bytes.
sql::StreamingBlobHandle blob_handle,
base::OnceCallback<void(/*success=*/bool)> on_complete);
~BlobWriter() override;
private:
BlobWriter(sql::StreamingBlobHandle blob_handle,
base::OnceCallback<void(/*success=*/bool)> on_complete);
void Start(mojo::ScopedDataPipeConsumerHandle consumer_handle);
// mojo::DataPipeDrainer::Client
void OnDataAvailable(base::span<const uint8_t> data) override;
void OnDataComplete() override;
// The position in the blob for the next write.
size_t bytes_written_so_far_ = 0;
// Will be set to null if an error has occurred when attempting to write into
// it.
std::optional<sql::StreamingBlobHandle> target_;
std::unique_ptr<mojo::DataPipeDrainer> drainer_;
// Called when done, with the parameter indicating success.
base::OnceCallback<void(/*success=*/bool)> on_complete_;
base::WeakPtrFactory<BlobWriter> weak_factory_{this};
};
} // namespace sqlite
} // namespace content::indexed_db
#endif // CONTENT_BROWSER_INDEXED_DB_INSTANCE_SQLITE_BLOB_WRITER_H_
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