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DNS seed timeout and fallback

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This commit is contained in:
Thomas Winget 2014-12-15 17:23:42 -05:00
parent f4675dc05d
commit 4a53898764
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GPG Key ID: 58131A160789E630
2 changed files with 61 additions and 11 deletions
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2
src/cryptonote_config.h
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@ -33,6 +33,8 @@
#include <string>
#include <boost/uuid/uuid.hpp>
#define CRYPTONOTE_DNS_TIMEOUT_MS 20000
#define CRYPTONOTE_MAX_BLOCK_NUMBER 500000000
#define CRYPTONOTE_MAX_BLOCK_SIZE 500000000 // block header blob limit, never used!
#define CRYPTONOTE_GETBLOCKTEMPLATE_MAX_BLOCK_SIZE 196608 //size of block (bytes) that is the maximum that miners will produce

54
src/p2p/net_node.inl
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@ -31,6 +31,9 @@
#pragma once
#include <algorithm>
#include <boost/date_time/posix_time/posix_time.hpp>
#include <boost/thread/thread.hpp>
#include <atomic>
#include "version.h"
#include "string_tools.h"
@ -252,19 +255,64 @@ namespace nodetool
// add the result addresses as seed nodes
// TODO: at some point add IPv6 support, but that won't be relevant
// for some time yet.
std::vector<std::vector<std::string>> dns_results;
std::vector<std::atomic_flag> dns_finished;
dns_results.resize(m_seed_nodes_list.size());
dns_finished.resize(m_seed_nodes_list.size());
// set each flag, thread will release when finished
for (auto& u : dns_finished)
u.test_and_set();
uint64_t result_index = 0;
for (const std::string& addr_str : m_seed_nodes_list)
{
uint64_t result_index_capture = result_index++;
boost::thread t([&]
{
// TODO: care about dnssec avail/valid
bool avail, valid;
std::vector<std::string> addr_list = tools::DNSResolver::instance().get_ipv4(addr_str, avail, valid);
for (const std::string& a : addr_list)
std::vector<std::string> addr_list = tools::DNSResolver().get_ipv4(addr_str, avail, valid);
dns_results[result_index_capture] = addr_list;
dns_finished[result_index_capture].clear();
});
}
uint64_t sleep_count = 0;
uint64_t sleep_interval_ms = 100;
while (sleep_count++ * sleep_interval_ms < CRYPTONOTE_DNS_TIMEOUT_MS)
{
append_net_address(m_seed_nodes, a + ":18080");
boost::this_thread::sleep(boost::posix_time::milliseconds());
bool all_done = false;
for (auto& done : dns_finished)
{
if (done.test_and_set())
break;
else
done.clear();
all_done = true;
}
if (all_done)
break;
}
for (const auto& result : dns_results)
{
for (const auto& addr_string : result)
{
append_net_address(m_seed_nodes, addr_string + ":18080");
}
}
if (!m_seed_nodes.size())
{
LOG_PRINT_L0("DNS seed node lookup either timed out or failed, falling back to defaults");
append_net_address(m_seed_nodes, "62.210.78.186:18080");
append_net_address(m_seed_nodes, "195.12.60.154:18080");
append_net_address(m_seed_nodes, "54.241.246.125:18080");