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Verify DBWrapper iterators are taking snapshots

The LevelDB docs seem to indicate that an iterator will not take
snapshots (even providing instructions on how to do so yourself).
In several of the places we use them, we assume snapshots to have
been taken.

In order to make sure LevelDB doesn't change out from under us
(and to prevent the next person who reads the docs from having the
same fright I did), verify that snapshots are taken in our tests.
tags/v0.16.1
Matt Corallo 3 years ago
parent
commit
bb8376bbc3
1 changed files with 14 additions and 2 deletions
  1. 14
    2
      src/test/dbwrapper_tests.cpp

+ 14
- 2
src/test/dbwrapper_tests.cpp View File

@@ -204,19 +204,31 @@ BOOST_AUTO_TEST_CASE(iterator_ordering)
for (int x=0x00; x<256; ++x) {
uint8_t key = x;
uint32_t value = x*x;
BOOST_CHECK(dbw.Write(key, value));
if (!(x & 1)) BOOST_CHECK(dbw.Write(key, value));
}

// Check that creating an iterator creates a snapshot
std::unique_ptr<CDBIterator> it(const_cast<CDBWrapper&>(dbw).NewIterator());

for (int x=0x00; x<256; ++x) {
uint8_t key = x;
uint32_t value = x*x;
if (x & 1) BOOST_CHECK(dbw.Write(key, value));
}

for (int seek_start : {0x00, 0x80}) {
it->Seek((uint8_t)seek_start);
for (int x=seek_start; x<256; ++x) {
for (int x=seek_start; x<255; ++x) {
uint8_t key;
uint32_t value;
BOOST_CHECK(it->Valid());
if (!it->Valid()) // Avoid spurious errors about invalid iterator's key and value in case of failure
break;
BOOST_CHECK(it->GetKey(key));
if (x & 1) {
BOOST_CHECK_EQUAL(key, x + 1);
continue;
}
BOOST_CHECK(it->GetValue(value));
BOOST_CHECK_EQUAL(key, x);
BOOST_CHECK_EQUAL(value, x*x);

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