example/KatranSimpleServer.cpp

/* Copyright (C) 2018-present, Facebook, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <signal.h>
#include <memory>
#include <vector>

#include <folly/Conv.h>
#include <folly/String.h>
#include <folly/init/Init.h>
#include <gflags/gflags.h>

#include <thrift/lib/cpp2/server/ThriftServer.h>
#include "KatranSimpleServiceHandler.h"
#include "KatranSimpleServiceSignalHandler.h"
#include "katran/lib/MacHelpers.h"

using apache::thrift::ThriftServer;
using lb::katran::KatranSimpleServiceHandler;

DEFINE_int32(port, 12307, "Service port");
DEFINE_int32(thriftMaxRequests, 50000, "Maximum number of active requests");
DEFINE_bool(thriftEnableCodel, true, "Enable Codel queuing timeout");

DEFINE_int32(num_io_threads, 1, "number of IO threads for thrift server");
DEFINE_string(intf, "eth0", "main interface");
DEFINE_string(ipip_intf, "ipip0", "ipip (v4) encap interface");
DEFINE_string(ipip6_intf, "ipip60", "ip(6)ip6 (v6) encap interface");
DEFINE_string(balancer_prog, "./balancer_kern.o", "path to balancer bpf prog");
DEFINE_string(
    healthchecker_prog,
    "./healthchecking_ipip.o",
    "path to healthchecking bpf prog");
DEFINE_string(
    default_mac,
    "00:00:00:00:00:01",
    "mac address of default router. must be in fomrat: xx:xx:xx:xx:xx:xx");
DEFINE_int32(priority, 2307, "tc's priority for bpf progs");
DEFINE_string(
    map_path,
    "",
    "path to pinned map from root xdp prog."
    " default path forces to work in standalone mode");
DEFINE_int32(prog_pos, 2, "katran's position inside root xdp array");
DEFINE_bool(hc_forwarding, true, "turn on forwarding path for healthchecks");
DEFINE_int32(shutdown_delay, 10000, "shutdown delay in milliseconds");
DEFINE_int64(lru_size, 8000000, "size of LRU table");
DEFINE_string(forwarding_cores, "", "coma separed list of forwarding cores");
DEFINE_string(
    numa_nodes,
    "",
    "coma separed list of numa nodes to forwarding cores mapping");

// routine which parses coma separated string of numbers
// (e.g. "1,2,3,4,10,11,12,13") to vector of int32_t
// will throw on failure.
std::vector<int32_t> parseIntLine(const std::string& line) {
  std::vector<int32_t> nums;
  if (!line.empty()) {
    std::vector<std::string> splitedLine;
    folly::split(",", line, splitedLine);
    for (const auto& num_str : splitedLine) {
      auto num = folly::to<int32_t>(num_str);
      nums.push_back(num);
    }
  }
  return nums;
}

int main(int argc, char** argv) {
  folly::init(&argc, &argv);
  FLAGS_logtostderr = 1;
  auto forwardingCores = parseIntLine(FLAGS_forwarding_cores);
  VLOG(2) << "size of forwarding cores vector is " << forwardingCores.size();
  auto numaNodes = parseIntLine(FLAGS_numa_nodes);
  VLOG(2) << "size of numa nodes vector is " << numaNodes.size();

  katran::KatranConfig config = {
      .mainInterface = FLAGS_intf,
      .v4TunInterface = FLAGS_ipip_intf,
      .v6TunInterface = FLAGS_ipip6_intf,
      .balancerProgPath = FLAGS_balancer_prog,
      .healthcheckingProgPath = FLAGS_healthchecker_prog,
      .defaultMac = ::katran::convertMacToUint(FLAGS_default_mac),
      .priority = static_cast<uint32_t>(FLAGS_priority),
      .rootMapPath = FLAGS_map_path,
      .rootMapPos = static_cast<uint32_t>(FLAGS_prog_pos),
      .enableHc = FLAGS_hc_forwarding,
  };
  config.LruSize = static_cast<uint64_t>(FLAGS_lru_size);
  config.forwardingCores = forwardingCores;
  config.numaNodes = numaNodes;

  auto handler = std::make_shared<KatranSimpleServiceHandler>(config);
  auto server = std::make_shared<ThriftServer>();

  server->setMaxRequests(FLAGS_thriftMaxRequests);
  server->setEnableCodel(FLAGS_thriftEnableCodel);

  server->setPort(FLAGS_port);
  server->setInterface(handler);
  server->setNumIOWorkerThreads(FLAGS_num_io_threads);

  LOG(INFO) << "Katran running on port: " << FLAGS_port;

  // Signal handler
  lb::katran::KatranSimpleServiceSignalHandler sigHandler(
      server->getEventBaseManager()->getEventBase(),
      server.get(),
      FLAGS_shutdown_delay);
  sigHandler.registerSignalHandler(SIGINT);
  sigHandler.registerSignalHandler(SIGTERM);

  server->serve();
  return 0;
}