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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.
#include "sql/streaming_blob_handle.h"
#include <stddef.h>
#include <stdint.h>
#include <functional>
#include <memory>
#include <optional>
#include <string>
#include <utility>
#include "base/containers/span.h"
#include "base/files/scoped_temp_dir.h"
#include "base/functional/bind.h"
#include "base/test/bind.h"
#include "base/time/time.h"
#include "sql/database.h"
#include "sql/sqlite_result_code.h"
#include "sql/statement.h"
#include "sql/statement_id.h"
#include "sql/test/test_helpers.h"
#include "sql/transaction.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/sqlite/sqlite3.h"
namespace sql {
class StreamingBlobHandleTest : public testing::Test {
public:
void SetUp() override {
ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
ASSERT_TRUE(db_.Open(
temp_dir_.GetPath().AppendASCII("streaming_blob_test.sqlite")));
}
protected:
base::ScopedTempDir temp_dir_;
Database db_{test::kTestTag};
};
TEST_F(StreamingBlobHandleTest, Basic) {
static const size_t kBlobSize = 128;
std::optional<Transaction> transaction;
transaction.emplace(&db_);
ASSERT_TRUE(transaction->Begin());
static constexpr char kCreateSql[] =
"CREATE TABLE foo (id INTEGER PRIMARY KEY AUTOINCREMENT, data BLOB, "
"timestamp INTEGER NOT NULL)";
ASSERT_TRUE(db_.Execute(kCreateSql));
// Insert a row with a blob that is yet to be written.
{
Statement statement(db_.GetCachedStatement(
SQL_FROM_HERE, "INSERT INTO foo (data, timestamp) VALUES (?, ?)"));
statement.BindBlobForStreaming(0, kBlobSize);
statement.BindTime(1, base::Time::Now());
ASSERT_TRUE(statement.Run());
}
const int64_t row_id = db_.GetLastInsertRowId();
// Write the blob.
std::optional<StreamingBlobHandle> writing_blob =
db_.GetStreamingBlob("foo", "data", row_id, /*readonly=*/false);
ASSERT_TRUE(writing_blob.has_value());
static const int kChunkSize = 8;
for (size_t i = 0; i < kBlobSize / kChunkSize; ++i) {
std::string data(kChunkSize, 'a' + i);
ASSERT_TRUE(writing_blob->Write(i * kChunkSize, base::as_byte_span(data)));
}
writing_blob.reset();
// Read the blob.
std::optional<StreamingBlobHandle> reading_blob = db_.GetStreamingBlob(
"foo", "data", db_.GetLastInsertRowId(), /*readonly=*/true);
ASSERT_TRUE(reading_blob.has_value());
std::string read_data(kBlobSize, 'X');
// Toss in an offset to ensure it works correctly.
ASSERT_TRUE(reading_blob->Read(
7, base::as_writable_byte_span(read_data).subspan(10U, kBlobSize - 20)));
EXPECT_EQ(
"XXXXXXXXXXabbbbbbbbccccccccddddddddeeeeeeeeffffffffgggggggghhhhhhhhiii"
"iiiiijjjjjjjjkkkkkkkkllllllllmmmmmmmmnnnnnnnnoooXXXXXXXXXX",
read_data);
// Make sure that committing this transaction doesn't affect the validity of
// the blob handle.
transaction->Commit();
transaction.reset();
EXPECT_TRUE(reading_blob->Read(0, base::as_writable_byte_span(read_data)));
EXPECT_EQ(
"aaaaaaaabbbbbbbbccccccccddddddddeeeeeeeeffffffffgggggggghhhhhhhhiiiiii"
"iijjjjjjjjkkkkkkkkllllllllmmmmmmmmnnnnnnnnoooooooopppppppp",
read_data);
// The blob's existence prevents closing the DB. Normally Chromium code
// closes the DB via Database::Close(); doing so now would hit a DCHECK.
ASSERT_EQ(ToSqliteResultCode(sqlite3_close(db_.db_.get())),
SqliteResultCode::kBusy);
// Coverage for move ctor.
auto reading_blob_owned =
std::make_unique<StreamingBlobHandle>(*std::move(reading_blob));
// The blob handle expires when the row it's in is updated. This means Read()
// will error out. This scenario is assumed to be a programming error.
StreamingBlobHandle* reading_blob_ptr = reading_blob_owned.get();
int sqlite_callback_error = SQLITE_OK;
db_.set_error_callback(base::BindRepeating(
base::BindLambdaForTesting(
[&sqlite_callback_error](
Database& database,
std::unique_ptr<StreamingBlobHandle> owned_blob, int sqlite_error,
Statement* statement) {
sqlite_callback_error = sqlite_error;
EXPECT_EQ(statement, nullptr);
// Many clients will close the database in the error
// callback. This call would present a problem if the blob
// handle were still open.
database.Close();
// Many clients will also delete the StreamingBlobHandle here,
// inside the error callback; make sure nothing bad happens.
}),
std::ref(db_), base::Passed(std::move(reading_blob_owned))));
transaction.emplace(&db_);
ASSERT_TRUE(transaction->Begin());
{
Statement statement(db_.GetCachedStatement(
SQL_FROM_HERE, "UPDATE foo SET timestamp = ? WHERE id = ?"));
statement.BindTime(0, base::Time::Now() + base::Milliseconds(100));
statement.BindInt64(1, row_id);
ASSERT_TRUE(statement.Run());
}
EXPECT_EQ(sqlite_callback_error, SQLITE_OK);
EXPECT_FALSE(
reading_blob_ptr->Read(0, base::as_writable_byte_span(read_data)));
EXPECT_EQ(sqlite_callback_error, SQLITE_ABORT);
}
} // namespace sql
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