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LibSQL: Implement freeing heap storage

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This allows us to free entire chains of blocks in one go.
This commit is contained in:
Jelle Raaijmakers 2023-05-24 15:48:53 +02:00 • committed by Tim Flynn
parent d7bbb8d64a
commit c58c87d7ef
3 changed files with 40 additions and 5 deletions
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24
Tests/LibSQL/TestSqlHeap.cpp
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@ -167,3 +167,27 @@ TEST_CASE(heap_reuse_freed_blocks_after_reopening_file)
EXPECT(heap_size_after_second_storage <= original_heap_size);
}
}
TEST_CASE(heap_free_storage)
{
ScopeGuard guard([]() { MUST(Core::System::unlink(db_path)); });
auto heap = create_heap();
auto storage_block_id = heap->request_new_block_index();
// Write large storage spanning multiple blocks
StringBuilder builder;
MUST(builder.try_append_repeated('x', SQL::Block::DATA_SIZE * 4));
auto long_string = builder.string_view();
TRY_OR_FAIL(heap->write_storage(storage_block_id, long_string.bytes()));
MUST(heap->flush());
auto heap_size = MUST(heap->file_size_in_bytes());
// Free the storage
TRY_OR_FAIL(heap->free_storage(storage_block_id));
// Again, write some large storage spanning multiple blocks
TRY_OR_FAIL(heap->write_storage(storage_block_id, long_string.bytes()));
MUST(heap->flush());
auto new_heap_size = MUST(heap->file_size_in_bytes());
EXPECT(new_heap_size <= heap_size);
}