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// Copyright (c) 2024-present The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or https://www.opensource.org/licenses/mit-license.php.
#include <chainparams.h>
#include <node/miner.h>
#include <net_processing.h>
#include <pow.h>
#include <test/util/setup_common.h>
#include <validation.h>
#include <boost/test/unit_test.hpp>
BOOST_FIXTURE_TEST_SUITE(peerman_tests, RegTestingSetup)
/** Window, in blocks, for connecting to NODE_NETWORK_LIMITED peers */
static constexpr int64_t NODE_NETWORK_LIMITED_ALLOW_CONN_BLOCKS = 144;
static void mineBlock(const node::NodeContext& node, std::chrono::seconds block_time)
{
auto curr_time = GetTime<std::chrono::seconds>();
SetMockTime(block_time); // update time so the block is created with it
node::BlockAssembler::Options options;
CBlock block = node::BlockAssembler{node.chainman->ActiveChainstate(), nullptr, options}.CreateNewBlock(CScript() << OP_TRUE)->block;
while (!CheckProofOfWork(block.GetHash(), block.nBits, node.chainman->GetConsensus())) ++block.nNonce;
block.fChecked = true; // little speedup
SetMockTime(curr_time); // process block at current time
Assert(node.chainman->ProcessNewBlock(std::make_shared<const CBlock>(block), /*force_processing=*/true, /*min_pow_checked=*/true, nullptr));
node.validation_signals->SyncWithValidationInterfaceQueue(); // drain events queue
}
// Verifying when network-limited peer connections are desirable based on the node's proximity to the tip
BOOST_AUTO_TEST_CASE(connections_desirable_service_flags)
{
std::unique_ptr<PeerManager> peerman = PeerManager::make(*m_node.connman, *m_node.addrman, nullptr, *m_node.chainman, *m_node.mempool, *m_node.warnings, {});
auto consensus = m_node.chainman->GetParams().GetConsensus();
// Check we start connecting to full nodes
ServiceFlags peer_flags{NODE_WITNESS | NODE_NETWORK_LIMITED};
BOOST_CHECK(peerman->GetDesirableServiceFlags(peer_flags) == ServiceFlags(NODE_NETWORK | NODE_WITNESS));
// Make peerman aware of the initial best block and verify we accept limited peers when we start close to the tip time.
auto tip = WITH_LOCK(::cs_main, return m_node.chainman->ActiveChain().Tip());
uint64_t tip_block_time = tip->GetBlockTime();
int tip_block_height = tip->nHeight;
peerman->SetBestBlock(tip_block_height, std::chrono::seconds{tip_block_time});
SetMockTime(tip_block_time + 1); // Set node time to tip time
BOOST_CHECK(peerman->GetDesirableServiceFlags(peer_flags) == ServiceFlags(NODE_NETWORK_LIMITED | NODE_WITNESS));
// Check we don't disallow limited peers connections when we are behind but still recoverable (below the connection safety window)
SetMockTime(GetTime<std::chrono::seconds>() + std::chrono::seconds{consensus.nPowTargetSpacing * (NODE_NETWORK_LIMITED_ALLOW_CONN_BLOCKS - 1)});
BOOST_CHECK(peerman->GetDesirableServiceFlags(peer_flags) == ServiceFlags(NODE_NETWORK_LIMITED | NODE_WITNESS));
// Check we disallow limited peers connections when we are further than the limited peers safety window
SetMockTime(GetTime<std::chrono::seconds>() + std::chrono::seconds{consensus.nPowTargetSpacing * 2});
BOOST_CHECK(peerman->GetDesirableServiceFlags(peer_flags) == ServiceFlags(NODE_NETWORK | NODE_WITNESS));
// By now, we tested that the connections desirable services flags change based on the node's time proximity to the tip.
// Now, perform the same tests for when the node receives a block.
m_node.validation_signals->RegisterValidationInterface(peerman.get());
// First, verify a block in the past doesn't enable limited peers connections
// At this point, our time is (NODE_NETWORK_LIMITED_ALLOW_CONN_BLOCKS + 1) * 10 minutes ahead the tip's time.
mineBlock(m_node, /*block_time=*/std::chrono::seconds{tip_block_time + 1});
BOOST_CHECK(peerman->GetDesirableServiceFlags(peer_flags) == ServiceFlags(NODE_NETWORK | NODE_WITNESS));
// Verify a block close to the tip enables limited peers connections
mineBlock(m_node, /*block_time=*/GetTime<std::chrono::seconds>());
BOOST_CHECK(peerman->GetDesirableServiceFlags(peer_flags) == ServiceFlags(NODE_NETWORK_LIMITED | NODE_WITNESS));
// Lastly, verify the stale tip checks can disallow limited peers connections after not receiving blocks for a prolonged period.
SetMockTime(GetTime<std::chrono::seconds>() + std::chrono::seconds{consensus.nPowTargetSpacing * NODE_NETWORK_LIMITED_ALLOW_CONN_BLOCKS + 1});
BOOST_CHECK(peerman->GetDesirableServiceFlags(peer_flags) == ServiceFlags(NODE_NETWORK | NODE_WITNESS));
}
BOOST_AUTO_TEST_SUITE_END()
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