pdns/dnsdist-carbon.cc

   1 /*
   2  * This file is part of PowerDNS or dnsdist.
   3  * Copyright -- PowerDNS.COM B.V. and its contributors
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * In addition, for the avoidance of any doubt, permission is granted to
  10  * link this program with OpenSSL and to (re)distribute the binaries
  11  * produced as the result of such linking.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21  */
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25 #include "iputils.hh"
  26 #include "dolog.hh"
  27 #include "sstuff.hh"
  28
  29 #include "namespaces.hh"
  30 #undef L
  31 #include "dnsdist.hh"
  32
  33 GlobalStateHolder<vector<CarbonConfig> > g_carbon;
  34 static time_t s_start=time(0);
  35 uint64_t uptimeOfProcess(const std::string& str)
  36 {
  37   return time(0) - s_start;
  38 }
  39
  40 void* carbonDumpThread()
  41 try
  42 {
  43   auto localCarbon = g_carbon.getLocal();
  44   for(int numloops=0;;++numloops) {
  45     if(localCarbon->empty()) {
  46       sleep(1);
  47       continue;
  48     }
  49     /* this is wrong, we use the interval of the first server
  50        for every single one of them */
  51     if(numloops) {
  52       const unsigned int interval = localCarbon->at(0).interval;
  53       sleep(interval);
  54     }
  55
  56     for (const auto& conf : *localCarbon) {
  57       const auto& server = conf.server;
  58       std::string hostname = conf.ourname;
  59       if(hostname.empty()) {
  60         char tmp[80];
  61         memset(tmp, 0, sizeof(tmp));
  62         gethostname(tmp, sizeof(tmp));
  63         char *p = strchr(tmp, '.');
  64         if(p) *p=0;
  65         hostname=tmp;
  66         boost::replace_all(hostname, ".", "_");
  67       }
  68
  69       try {
  70         Socket s(server.sin4.sin_family, SOCK_STREAM);
  71         s.setNonBlocking();
  72         s.connect(server);  // we do the connect so the attempt happens while we gather stats
  73         ostringstream str;
  74         time_t now=time(0);
  75         for(const auto& e : g_stats.entries) {
  76           str<<"dnsdist."<<hostname<<".main."<<e.first<<' ';
  77           if(const auto& val = boost::get<DNSDistStats::stat_t*>(&e.second))
  78             str<<(*val)->load();
  79           else if (const auto& dval = boost::get<double*>(&e.second))
  80             str<<**dval;
  81           else
  82             str<<(*boost::get<DNSDistStats::statfunction_t>(&e.second))(e.first);
  83           str<<' '<<now<<"\r\n";
  84         }
  85         const auto states = g_dstates.getCopy();
  86         for(const auto& state : states) {
  87           string serverName = state->name.empty() ? (state->remote.toString() + ":" + std::to_string(state->remote.getPort())) : state->getName();
  88           boost::replace_all(serverName, ".", "_");
  89           const string base = "dnsdist." + hostname + ".main.servers." + serverName + ".";
  90           str<<base<<"queries" << ' ' << state->queries.load() << " " << now << "\r\n";
  91           str<<base<<"drops" << ' ' << state->reuseds.load() << " " << now << "\r\n";
  92           str<<base<<"latency" << ' ' << (state->availability != DownstreamState::Availability::Down ? state->latencyUsec/1000.0 : 0) << " " << now << "\r\n";
  93           str<<base<<"senderrors" << ' ' << state->sendErrors.load() << " " << now << "\r\n";
  94           str<<base<<"outstanding" << ' ' << state->outstanding.load() << " " << now << "\r\n";
  95         }
  96         for(const auto& front : g_frontends) {
  97           if (front->udpFD == -1 && front->tcpFD == -1)
  98             continue;
  99
 100           string frontName = front->local.toString() + ":" + std::to_string(front->local.getPort()) +  (front->udpFD >= 0 ? "_udp" : "_tcp");
 101           boost::replace_all(frontName, ".", "_");
 102           const string base = "dnsdist." + hostname + ".main.frontends." + frontName + ".";
 103           str<<base<<"queries" << ' ' << front->queries.load() << " " << now << "\r\n";
 104         }
 105         const auto localPools = g_pools.getCopy();
 106         for (const auto& entry : localPools) {
 107           string poolName = entry.first;
 108           boost::replace_all(poolName, ".", "_");
 109           if (poolName.empty()) {
 110             poolName = "_default_";
 111           }
 112           const string base = "dnsdist." + hostname + ".main.pools." + poolName + ".";
 113           const std::shared_ptr<ServerPool> pool = entry.second;
 114           str<<base<<"servers" << " " << pool->servers.size() << " " << now << "\r\n";
 115           if (pool->packetCache != nullptr) {
 116             const auto& cache = pool->packetCache;
 117             str<<base<<"cache-size" << " " << cache->getMaxEntries() << " " << now << "\r\n";
 118             str<<base<<"cache-entries" << " " << cache->getEntriesCount() << " " << now << "\r\n";
 119             str<<base<<"cache-hits" << " " << cache->getHits() << " " << now << "\r\n";
 120             str<<base<<"cache-misses" << " " << cache->getMisses() << " " << now << "\r\n";
 121             str<<base<<"cache-deferred-inserts" << " " << cache->getDeferredInserts() << " " << now << "\r\n";
 122             str<<base<<"cache-deferred-lookups" << " " << cache->getDeferredLookups() << " " << now << "\r\n";
 123             str<<base<<"cache-lookup-collisions" << " " << cache->getLookupCollisions() << " " << now << "\r\n";
 124             str<<base<<"cache-insert-collisions" << " " << cache->getInsertCollisions() << " " << now << "\r\n";
 125             str<<base<<"cache-ttl-too-shorts" << " " << cache->getTTLTooShorts() << " " << now << "\r\n";
 126           }
 127         }
 128
 129         {
 130           WriteLock wl(&g_qcount.queryLock);
 131           std::string qname;
 132           for(auto &record: g_qcount.records) {
 133             qname = record.first;
 134             boost::replace_all(qname, ".", "_");
 135             str<<"dnsdist.querycount." << qname << ".queries " << record.second << " " << now << "\r\n";
 136           }
 137           g_qcount.records.clear();
 138         }
 139
 140         const string msg = str.str();
 141
 142         int ret = waitForRWData(s.getHandle(), false, 1 , 0);
 143         if(ret <= 0 ) {
 144           vinfolog("Unable to write data to carbon server on %s: %s", server.toStringWithPort(), (ret<0 ? strerror(errno) : "Timeout"));
 145           continue;
 146         }
 147         s.setBlocking();
 148         writen2(s.getHandle(), msg.c_str(), msg.size());
 149       }
 150       catch(std::exception& e) {
 151         warnlog("Problem sending carbon data: %s", e.what());
 152       }
 153     }
 154   }
 155   return 0;
 156 }
 157 catch(std::exception& e)
 158 {
 159   errlog("Carbon thread died: %s", e.what());
 160   return 0;
 161 }
 162 catch(PDNSException& e)
 163 {
 164   errlog("Carbon thread died, PDNSException: %s", e.reason);
 165   return 0;
 166 }
 167 catch(...)
 168 {
 169   errlog("Carbon thread died");
 170   return 0;
 171 }