Add unit test for UpdateCoins
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@ -923,6 +923,134 @@ BOOST_AUTO_TEST_CASE(coins_coinbase_spends)
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// This test is similar to the previous test
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// except the emphasis is on testing the functionality of UpdateCoins
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// random txs are created and UpdateCoins is used to update the cache stack
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// In particular it is tested that spending a duplicate coinbase tx
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// has the expected effect (the other duplicate is overwitten at all cache levels)
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BOOST_AUTO_TEST_CASE(updatecoins_simulation_test)
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{
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bool spent_a_duplicate_coinbase = false;
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// A simple map to track what we expect the cache stack to represent.
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std::map<uint256, CCoins> result;
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// The cache stack.
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CCoinsViewTest base; // A CCoinsViewTest at the bottom.
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std::vector<CCoinsViewCacheTest*> stack; // A stack of CCoinsViewCaches on top.
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stack.push_back(new CCoinsViewCacheTest(&base)); // Start with one cache.
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// Track the txids we've used and whether they have been spent or not
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std::map<uint256, CAmount> coinbaseids;
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std::set<uint256> alltxids;
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std::set<uint256> duplicateids;
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for (unsigned int i = 0; i < NUM_SIMULATION_ITERATIONS; i++) {
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{
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CMutableTransaction tx;
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tx.vin.resize(1);
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tx.vout.resize(1);
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tx.vout[0].nValue = i; //Keep txs unique unless intended to duplicate
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unsigned int height = insecure_rand();
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// 1/10 times create a coinbase
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if (insecure_rand() % 10 == 0 || coinbaseids.size() < 10) {
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// 1/100 times create a duplicate coinbase
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if (insecure_rand() % 10 == 0 && coinbaseids.size()) {
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std::map<uint256, CAmount>::iterator coinbaseIt = coinbaseids.lower_bound(GetRandHash());
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if (coinbaseIt == coinbaseids.end()) {
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coinbaseIt = coinbaseids.begin();
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}
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//Use same random value to have same hash and be a true duplicate
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tx.vout[0].nValue = coinbaseIt->second;
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assert(tx.GetHash() == coinbaseIt->first);
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duplicateids.insert(coinbaseIt->first);
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}
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else {
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coinbaseids[tx.GetHash()] = tx.vout[0].nValue;
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}
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assert(CTransaction(tx).IsCoinBase());
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}
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// 9/10 times create a regular tx
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else {
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uint256 prevouthash;
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// equally likely to spend coinbase or non coinbase
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std::set<uint256>::iterator txIt = alltxids.lower_bound(GetRandHash());
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if (txIt == alltxids.end()) {
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txIt = alltxids.begin();
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}
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prevouthash = *txIt;
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// Construct the tx to spend the coins of prevouthash
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tx.vin[0].prevout.hash = prevouthash;
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tx.vin[0].prevout.n = 0;
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// Update the expected result of prevouthash to know these coins are spent
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CCoins& oldcoins = result[prevouthash];
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oldcoins.Clear();
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// It is of particular importance here that once we spend a coinbase tx hash
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// it is no longer available to be duplicated (or spent again)
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// BIP 34 in conjunction with enforcing BIP 30 (at least until BIP 34 was active)
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// results in the fact that no coinbases were duplicated after they were already spent
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alltxids.erase(prevouthash);
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coinbaseids.erase(prevouthash);
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// The test is designed to ensure spending a duplicate coinbase will work properly
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// if that ever happens and not resurrect the previously overwritten coinbase
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if (duplicateids.count(prevouthash))
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spent_a_duplicate_coinbase = true;
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assert(!CTransaction(tx).IsCoinBase());
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}
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// Track this tx to possibly spend later
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alltxids.insert(tx.GetHash());
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// Update the expected result to know about the new output coins
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CCoins &coins = result[tx.GetHash()];
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coins.FromTx(tx, height);
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UpdateCoins(tx, *(stack.back()), height);
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}
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// Once every 1000 iterations and at the end, verify the full cache.
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if (insecure_rand() % 1000 == 1 || i == NUM_SIMULATION_ITERATIONS - 1) {
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for (std::map<uint256, CCoins>::iterator it = result.begin(); it != result.end(); it++) {
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const CCoins* coins = stack.back()->AccessCoins(it->first);
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if (coins) {
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BOOST_CHECK(*coins == it->second);
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} else {
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BOOST_CHECK(it->second.IsPruned());
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}
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}
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}
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if (insecure_rand() % 100 == 0) {
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// Every 100 iterations, change the cache stack.
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if (stack.size() > 0 && insecure_rand() % 2 == 0) {
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stack.back()->Flush();
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delete stack.back();
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stack.pop_back();
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}
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if (stack.size() == 0 || (stack.size() < 4 && insecure_rand() % 2)) {
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CCoinsView* tip = &base;
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if (stack.size() > 0) {
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tip = stack.back();
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}
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stack.push_back(new CCoinsViewCacheTest(tip));
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}
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}
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}
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// Clean up the stack.
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while (stack.size() > 0) {
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delete stack.back();
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stack.pop_back();
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}
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// Verify coverage.
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BOOST_CHECK(spent_a_duplicate_coinbase);
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}
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BOOST_AUTO_TEST_CASE(ccoins_serialization)
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{
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// Good example
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