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Merge #8282: net: Feeler connections to increase online addrs in the tried table.

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dbb1f64 Added feeler connections increasing good addrs in the tried table. (Ethan Heilman)
This commit is contained in:
Wladimir J. van der Laan 2016-08-25 09:58:23 +02:00
commit 026c6edac9
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GPG key ID: 74810B012346C9A6
4 changed files with 83 additions and 9 deletions
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6
src/main.cpp
View file

@ -4903,6 +4903,12 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
if (strCommand == NetMsgType::VERSION)
{
// Feeler connections exist only to verify if address is online.
if (pfrom->fFeeler) {
assert(pfrom->fInbound == false);
pfrom->fDisconnect = true;
}
// Each connection can only send one version message
if (pfrom->nVersion != 0)
{

59
src/net.cpp
View file

@ -43,6 +43,9 @@
// Dump addresses to peers.dat and banlist.dat every 15 minutes (900s)
#define DUMP_ADDRESSES_INTERVAL 900
// We add a random period time (0 to 1 seconds) to feeler connections to prevent synchronization.
#define FEELER_SLEEP_WINDOW 1
#if !defined(HAVE_MSG_NOSIGNAL) && !defined(MSG_NOSIGNAL)
#define MSG_NOSIGNAL 0
#endif
@ -61,6 +64,7 @@
namespace {
const int MAX_OUTBOUND_CONNECTIONS = 8;
const int MAX_FEELER_CONNECTIONS = 1;
struct ListenSocket {
SOCKET socket;
@ -1017,7 +1021,8 @@ static void AcceptConnection(const ListenSocket& hListenSocket) {
SOCKET hSocket = accept(hListenSocket.socket, (struct sockaddr*)&sockaddr, &len);
CAddress addr;
int nInbound = 0;
int nMaxInbound = nMaxConnections - MAX_OUTBOUND_CONNECTIONS;
int nMaxInbound = nMaxConnections - (MAX_OUTBOUND_CONNECTIONS + MAX_FEELER_CONNECTIONS);
assert(nMaxInbound > 0);
if (hSocket != INVALID_SOCKET)
if (!addr.SetSockAddr((const struct sockaddr*)&sockaddr))
@ -1613,6 +1618,9 @@ void ThreadOpenConnections()
// Initiate network connections
int64_t nStart = GetTime();
// Minimum time before next feeler connection (in microseconds).
int64_t nNextFeeler = PoissonNextSend(nStart*1000*1000, FEELER_INTERVAL);
while (true)
{
ProcessOneShot();
@ -1652,13 +1660,36 @@ void ThreadOpenConnections()
}
}
}
assert(nOutbound <= (MAX_OUTBOUND_CONNECTIONS + MAX_FEELER_CONNECTIONS));
// Feeler Connections
//
// Design goals:
// * Increase the number of connectable addresses in the tried table.
//
// Method:
// * Choose a random address from new and attempt to connect to it if we can connect
// successfully it is added to tried.
// * Start attempting feeler connections only after node finishes making outbound
// connections.
// * Only make a feeler connection once every few minutes.
//
bool fFeeler = false;
if (nOutbound >= MAX_OUTBOUND_CONNECTIONS) {
int64_t nTime = GetTimeMicros(); // The current time right now (in microseconds).
if (nTime > nNextFeeler) {
nNextFeeler = PoissonNextSend(nTime, FEELER_INTERVAL);
fFeeler = true;
} else {
continue;
}
}
int64_t nANow = GetAdjustedTime();
int nTries = 0;
while (true)
{
CAddrInfo addr = addrman.Select();
CAddrInfo addr = addrman.Select(fFeeler);
// if we selected an invalid address, restart
if (!addr.IsValid() || setConnected.count(addr.GetGroup()) || IsLocal(addr))
@ -1694,8 +1725,17 @@ void ThreadOpenConnections()
break;
}
if (addrConnect.IsValid())
OpenNetworkConnection(addrConnect, (int)setConnected.size() >= std::min(nMaxConnections - 1, 2), &grant);
if (addrConnect.IsValid()) {
if (fFeeler) {
// Add small amount of random noise before connection to avoid synchronization.
int randsleep = GetRandInt(FEELER_SLEEP_WINDOW * 1000);
MilliSleep(randsleep);
LogPrint("net", "Making feeler connection to %s\n", addrConnect.ToString());
}
OpenNetworkConnection(addrConnect, (int)setConnected.size() >= std::min(nMaxConnections - 1, 2), &grant, NULL, false, fFeeler);
}
}
}
@ -1777,7 +1817,7 @@ void ThreadOpenAddedConnections()
}
// if successful, this moves the passed grant to the constructed node
bool OpenNetworkConnection(const CAddress& addrConnect, bool fCountFailure, CSemaphoreGrant *grantOutbound, const char *pszDest, bool fOneShot)
bool OpenNetworkConnection(const CAddress& addrConnect, bool fCountFailure, CSemaphoreGrant *grantOutbound, const char *pszDest, bool fOneShot, bool fFeeler)
{
//
// Initiate outbound network connection
@ -1801,6 +1841,8 @@ bool OpenNetworkConnection(const CAddress& addrConnect, bool fCountFailure, CSem
pnode->fNetworkNode = true;
if (fOneShot)
pnode->fOneShot = true;
if (fFeeler)
pnode->fFeeler = true;
return true;
}
@ -2062,7 +2104,7 @@ void StartNode(boost::thread_group& threadGroup, CScheduler& scheduler)
if (semOutbound == NULL) {
// initialize semaphore
int nMaxOutbound = std::min(MAX_OUTBOUND_CONNECTIONS, nMaxConnections);
int nMaxOutbound = std::min((MAX_OUTBOUND_CONNECTIONS + MAX_FEELER_CONNECTIONS), nMaxConnections);
semOutbound = new CSemaphore(nMaxOutbound);
}
@ -2107,7 +2149,7 @@ bool StopNode()
LogPrintf("StopNode()\n");
MapPort(false);
if (semOutbound)
for (int i=0; i<MAX_OUTBOUND_CONNECTIONS; i++)
for (int i=0; i<(MAX_OUTBOUND_CONNECTIONS + MAX_FEELER_CONNECTIONS); i++)
semOutbound->post();
if (fAddressesInitialized)
@ -2448,6 +2490,7 @@ CNode::CNode(SOCKET hSocketIn, const CAddress& addrIn, const std::string& addrNa
fWhitelisted = false;
fOneShot = false;
fClient = false; // set by version message
fFeeler = false;
fInbound = fInboundIn;
fNetworkNode = false;
fSuccessfullyConnected = false;

5
src/net.h
View file

@ -41,6 +41,8 @@ namespace boost {
static const int PING_INTERVAL = 2 * 60;
/** Time after which to disconnect, after waiting for a ping response (or inactivity). */
static const int TIMEOUT_INTERVAL = 20 * 60;
/** Run the feeler connection loop once every 2 minutes or 120 seconds. **/
static const int FEELER_INTERVAL = 120;
/** The maximum number of entries in an 'inv' protocol message */
static const unsigned int MAX_INV_SZ = 50000;
/** The maximum number of new addresses to accumulate before announcing. */
@ -89,7 +91,7 @@ CNode* FindNode(const CSubNet& subNet);
CNode* FindNode(const std::string& addrName);
CNode* FindNode(const CService& ip);
CNode* FindNode(const NodeId id); //TODO: Remove this
bool OpenNetworkConnection(const CAddress& addrConnect, bool fCountFailure, CSemaphoreGrant *grantOutbound = NULL, const char *strDest = NULL, bool fOneShot = false);
bool OpenNetworkConnection(const CAddress& addrConnect, bool fCountFailure, CSemaphoreGrant *grantOutbound = NULL, const char *strDest = NULL, bool fOneShot = false, bool fFeeler = false);
void MapPort(bool fUseUPnP);
unsigned short GetListenPort();
bool BindListenPort(const CService &bindAddr, std::string& strError, bool fWhitelisted = false);
@ -350,6 +352,7 @@ public:
// the network or wire types and the cleaned string used when displayed or logged.
std::string strSubVer, cleanSubVer;
bool fWhitelisted; // This peer can bypass DoS banning.
bool fFeeler; // If true this node is being used as a short lived feeler.
bool fOneShot;
bool fClient;
bool fInbound;

22
src/test/net_tests.cpp
View file

@ -150,4 +150,26 @@ BOOST_AUTO_TEST_CASE(caddrdb_read_corrupted)
BOOST_CHECK(addrman2.size() == 0);
}
BOOST_AUTO_TEST_CASE(cnode_simple_test)
{
SOCKET hSocket = INVALID_SOCKET;
in_addr ipv4Addr;
ipv4Addr.s_addr = 0xa0b0c001;
CAddress addr = CAddress(CService(ipv4Addr, 7777), NODE_NETWORK);
std::string pszDest = "";
bool fInboundIn = false;
// Test that fFeeler is false by default.
CNode* pnode1 = new CNode(hSocket, addr, pszDest, fInboundIn);
BOOST_CHECK(pnode1->fInbound == false);
BOOST_CHECK(pnode1->fFeeler == false);
fInboundIn = true;
CNode* pnode2 = new CNode(hSocket, addr, pszDest, fInboundIn);
BOOST_CHECK(pnode2->fInbound == true);
BOOST_CHECK(pnode2->fFeeler == false);
}
BOOST_AUTO_TEST_SUITE_END()