Differential D3586 Diff 10063 src/test/flatfile_tests.cpp

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src/test/flatfile_tests.cpp

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				// Copyright (c) 2019 The Bitcoin Core developers
				// Distributed under the MIT software license, see the accompanying
				// file COPYING or http://www.opensource.org/licenses/mit-license.php.

				#include <flatfile.h>

				#include <clientversion.h>
				#include <streams.h>

				#include <test/test_bitcoin.h>

				#include <boost/test/unit_test.hpp>

				BOOST_FIXTURE_TEST_SUITE(flatfile_tests, BasicTestingSetup)

				BOOST_AUTO_TEST_CASE(flatfile_filename) {
				auto data_dir = SetDataDir("flatfile_test");

				CDiskBlockPos pos(456, 789);

				FlatFileSeq seq1(data_dir, "a", 16 * 1024);
				BOOST_CHECK_EQUAL(seq1.FileName(pos), data_dir / "a00456.dat");

				FlatFileSeq seq2(data_dir / "a", "b", 16 * 1024);
				BOOST_CHECK_EQUAL(seq2.FileName(pos), data_dir / "a" / "b00456.dat");
				}

				BOOST_AUTO_TEST_CASE(flatfile_open) {
				auto data_dir = SetDataDir("flatfile_test");
				FlatFileSeq seq(data_dir, "a", 16 * 1024);

				std::string line1(
				"A purely peer-to-peer version of electronic cash would allow online "
				"payments to be sent directly from one party to another without going "
				"through a financial institution.");
				std::string line2("Digital signatures provide part of the solution, but "
				"the main benefits are lost if a trusted third party is "
				"still required to prevent double-spending.");

				size_t pos1 = 0;
				size_t pos2 = pos1 + GetSerializeSize(line1, 0, CLIENT_VERSION);

				// Write first line to file.
				{
				CAutoFile file(seq.Open(CDiskBlockPos(0, pos1)), SER_DISK,
				CLIENT_VERSION);
				file << LIMITED_STRING(line1, 256);
				}

				// Attempt to append to file opened in read-only mode.
				{
				CAutoFile file(seq.Open(CDiskBlockPos(0, pos2), true), SER_DISK,
				CLIENT_VERSION);
				BOOST_CHECK_THROW(file << LIMITED_STRING(line2, 256),
				std::ios_base::failure);
				}

				// Append second line to file.
				{
				CAutoFile file(seq.Open(CDiskBlockPos(0, pos2)), SER_DISK,
				CLIENT_VERSION);
				file << LIMITED_STRING(line2, 256);
				}

				// Read text from file in read-only mode.
				{
				std::string text;
				CAutoFile file(seq.Open(CDiskBlockPos(0, pos1), true), SER_DISK,
				CLIENT_VERSION);

				file >> LIMITED_STRING(text, 256);
				BOOST_CHECK_EQUAL(text, line1);

				file >> LIMITED_STRING(text, 256);
				BOOST_CHECK_EQUAL(text, line2);
				}

				// Read text from file with position offset.
				{
				std::string text;
				CAutoFile file(seq.Open(CDiskBlockPos(0, pos2)), SER_DISK,
				CLIENT_VERSION);

				file >> LIMITED_STRING(text, 256);
				BOOST_CHECK_EQUAL(text, line2);
				}

				// Ensure another file in the sequence has no data.
				{
				std::string text;
				CAutoFile file(seq.Open(CDiskBlockPos(1, pos2)), SER_DISK,
				CLIENT_VERSION);
				BOOST_CHECK_THROW(file >> LIMITED_STRING(text, 256),
				std::ios_base::failure);
				}
				}

				BOOST_AUTO_TEST_CASE(flatfile_allocate) {
				auto data_dir = SetDataDir("flatfile_test");
				FlatFileSeq seq(data_dir, "a", 100);

				bool out_of_space;

				BOOST_CHECK_EQUAL(seq.Allocate(CDiskBlockPos(0, 0), 1, out_of_space), 100);
				BOOST_CHECK_EQUAL(fs::file_size(seq.FileName(CDiskBlockPos(0, 0))), 100);
				BOOST_CHECK(!out_of_space);

				BOOST_CHECK_EQUAL(seq.Allocate(CDiskBlockPos(0, 99), 1, out_of_space), 0);
				BOOST_CHECK_EQUAL(fs::file_size(seq.FileName(CDiskBlockPos(0, 99))), 100);
				BOOST_CHECK(!out_of_space);

				BOOST_CHECK_EQUAL(seq.Allocate(CDiskBlockPos(0, 99), 2, out_of_space), 101);
				BOOST_CHECK_EQUAL(fs::file_size(seq.FileName(CDiskBlockPos(0, 99))), 200);
				BOOST_CHECK(!out_of_space);
				}

				BOOST_AUTO_TEST_CASE(flatfile_flush) {
				auto data_dir = SetDataDir("flatfile_test");
				FlatFileSeq seq(data_dir, "a", 100);

				bool out_of_space;
				seq.Allocate(CDiskBlockPos(0, 0), 1, out_of_space);

				// Flush without finalize should not truncate file.
				seq.Flush(CDiskBlockPos(0, 1));
				BOOST_CHECK_EQUAL(fs::file_size(seq.FileName(CDiskBlockPos(0, 1))), 100);

				// Flush with finalize should truncate file.
				seq.Flush(CDiskBlockPos(0, 1), true);
				BOOST_CHECK_EQUAL(fs::file_size(seq.FileName(CDiskBlockPos(0, 1))), 1);
				}

				BOOST_AUTO_TEST_SUITE_END()