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[net processing] Refactor MaybeSendAddr()

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Changes to make MaybeSendAddr simpler and easier to maintain/update:

- assert invariant that node.vAddrToSend.size() can never exceed
  MAX_ADDR_TO_SEND
- erase known addresses from vAddrToSend in one pass
- no check for (vAddr.size() >= MAX_ADDR_TO_SEND) during iteration,
  since vAddr can never exceed MAX_ADDR_TO_SEND.
This commit is contained in:
John Newbery 2020-07-09 11:32:15 +01:00
parent 01a79ff924
commit 935d488922
1 changed files with 24 additions and 22 deletions
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46
src/net_processing.cpp
View file

@ -33,6 +33,7 @@
#include <util/system.h>
#include <validation.h>
#include <algorithm>
#include <memory>
#include <optional>
#include <typeinfo>
@ -4148,8 +4149,6 @@ void PeerManagerImpl::MaybeSendAddr(CNode& node, std::chrono::microseconds curre
assert(node.m_addr_known);
const CNetMsgMaker msgMaker(node.GetCommonVersion());
LOCK(node.m_addr_send_times_mutex);
// Periodically advertise our local address to the peer.
if (fListen && !m_chainman.ActiveChainstate().IsInitialBlockDownload() &&
@ -4174,8 +4173,25 @@ void PeerManagerImpl::MaybeSendAddr(CNode& node, std::chrono::microseconds curre
if (current_time <= node.m_next_addr_send) return;
node.m_next_addr_send = PoissonNextSend(current_time, AVG_ADDRESS_BROADCAST_INTERVAL);
std::vector<CAddress> vAddr;
vAddr.reserve(node.vAddrToSend.size());
if (!Assume(node.vAddrToSend.size() <= MAX_ADDR_TO_SEND)) {
// Should be impossible since we always check size before adding to
// vAddrToSend. Recover by trimming the vector.
node.vAddrToSend.resize(MAX_ADDR_TO_SEND);
}
// Remove addr records that the peer already knows about, and add new
// addrs to the m_addr_known filter on the same pass.
auto addr_already_known = [&node](const CAddress& addr) {
bool ret = node.m_addr_known->contains(addr.GetKey());
if (!ret) node.m_addr_known->insert(addr.GetKey());
return ret;
};
node.vAddrToSend.erase(std::remove_if(node.vAddrToSend.begin(), node.vAddrToSend.end(), addr_already_known),
node.vAddrToSend.end());
// No addr messages to send
if (node.vAddrToSend.empty()) return;
const char* msg_type;
int make_flags;
@ -4186,27 +4202,13 @@ void PeerManagerImpl::MaybeSendAddr(CNode& node, std::chrono::microseconds curre
msg_type = NetMsgType::ADDR;
make_flags = 0;
}
for (const CAddress& addr : node.vAddrToSend)
{
if (!node.m_addr_known->contains(addr.GetKey()))
{
node.m_addr_known->insert(addr.GetKey());
vAddr.push_back(addr);
// receiver rejects addr messages larger than MAX_ADDR_TO_SEND
if (vAddr.size() >= MAX_ADDR_TO_SEND)
{
m_connman.PushMessage(&node, msgMaker.Make(make_flags, msg_type, vAddr));
vAddr.clear();
}
}
}
m_connman.PushMessage(&node, CNetMsgMaker(node.GetCommonVersion()).Make(make_flags, msg_type, node.vAddrToSend));
node.vAddrToSend.clear();
if (!vAddr.empty())
m_connman.PushMessage(&node, msgMaker.Make(make_flags, msg_type, vAddr));
// we only send the big addr message once
if (node.vAddrToSend.capacity() > 40)
if (node.vAddrToSend.capacity() > 40) {
node.vAddrToSend.shrink_to_fit();
}
}
namespace {