256 lines
7.0 KiB
C++
256 lines
7.0 KiB
C++
#include <rapidjson/document.h>
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#include <sys/stat.h>
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#include <argparse.hpp>
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#include <atomic>
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#include <csignal>
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#include <daggy/Serialization.hpp>
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#include <daggy/Server.hpp>
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#include <fstream>
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#include <iostream>
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// Add executors here
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#include <daggy/executors/task/ForkingTaskExecutor.hpp>
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#include <daggy/executors/task/SlurmTaskExecutor.hpp>
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// Add loggers here
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#include <daggy/loggers/dag_run/OStreamLogger.hpp>
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#include <daggy/loggers/dag_run/RedisLogger.hpp>
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#include "daggy/executors/task/TaskExecutor.hpp"
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#include "daggy/loggers/dag_run/DAGRunLogger.hpp"
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namespace rj = rapidjson;
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static std::atomic<bool> running{true};
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void signalHandler(int signal)
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{
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switch (signal) {
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case SIGHUP:
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break;
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case SIGINT:
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case SIGTERM:
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running = false;
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break;
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default:
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break;
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}
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}
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void daemonize()
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{
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pid_t pid;
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struct sigaction newSigAction;
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sigset_t newSigSet;
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/* Check if parent process id is set */
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if (getppid() == 1) {
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return;
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}
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/* Set signal mask - signals we want to block */
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sigemptyset(&newSigSet);
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sigaddset(&newSigSet,
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SIGCHLD); /* ignore child - i.e. we don't need to wait for it */
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sigaddset(&newSigSet, SIGTSTP); /* ignore Tty stop signals */
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sigaddset(&newSigSet, SIGTTOU); /* ignore Tty background writes */
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sigaddset(&newSigSet, SIGTTIN); /* ignore Tty background reads */
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sigprocmask(SIG_BLOCK, &newSigSet,
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nullptr); /* Block the above specified signals */
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/* Set up a signal handler */
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newSigAction.sa_handler = signalHandler;
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sigemptyset(&newSigAction.sa_mask);
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newSigAction.sa_flags = 0;
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/* Signals to handle */
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sigaction(SIGHUP, &newSigAction, nullptr); /* catch hangup signal */
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sigaction(SIGTERM, &newSigAction, nullptr); /* catch term signal */
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sigaction(SIGINT, &newSigAction, nullptr); /* catch interrupt signal */
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// Fork once
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pid = fork();
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if (pid < 0) {
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exit(EXIT_FAILURE);
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}
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if (pid > 0) {
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exit(EXIT_SUCCESS);
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}
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/* On success: The child process becomes session leader */
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if (setsid() < 0) {
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std::cerr << "Unable to setsid" << std::endl;
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exit(EXIT_FAILURE);
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}
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/* Catch, ignore and handle signals */
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signal(SIGCHLD, SIG_IGN);
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signal(SIGHUP, SIG_IGN);
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/* Fork off for the second time*/
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pid = fork();
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if (pid < 0)
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exit(EXIT_FAILURE);
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if (pid > 0)
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exit(EXIT_SUCCESS);
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umask(0);
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/* Change the working directory to the root directory */
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/* or another appropriated directory */
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auto rc = chdir("/");
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(void)rc;
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/* Close all open file descriptors */
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for (int x = sysconf(_SC_OPEN_MAX); x >= 0; x--) {
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close(x);
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}
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}
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namespace dl = daggy::loggers::dag_run;
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std::unique_ptr<dl::DAGRunLogger> loggerFactory(const rj::Value &config)
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{
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if (config.HasMember("logger")) {
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const auto &logConf = config["logger"];
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if (!logConf.IsObject())
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throw std::runtime_error("logger config is not an object");
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if (!logConf.HasMember("name"))
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throw std::runtime_error("logger config is missing logger name");
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if (!logConf.HasMember("config"))
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throw std::runtime_error("logger config is missing logger config");
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std::string name = logConf["name"].GetString();
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const auto &logConfig = logConf["config"];
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if (name == "OStreamLogger") {
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if (logConfig.HasMember("file")) {
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std::ofstream ofh(logConfig["file"].GetString());
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return std::make_unique<dl::OStreamLogger>(ofh);
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}
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}
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else if (name == "RedisLogger") {
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std::string host = "localhost";
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uint16_t port = 6379;
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std::string prefix = "daggy";
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if (logConfig.HasMember("prefix"))
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prefix = logConfig["prefix"].GetString();
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if (logConfig.HasMember("host"))
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host = logConfig["host"].GetString();
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if (logConfig.HasMember("port"))
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port = logConfig["port"].GetInt();
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return std::make_unique<dl::RedisLogger>(prefix, host, port);
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}
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else
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throw std::runtime_error("Unknown logger type: " + name);
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}
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return std::make_unique<dl::OStreamLogger>(std::cout);
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}
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namespace de = daggy::executors::task;
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std::unique_ptr<de::TaskExecutor> executorFactory(const rj::Value &config)
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{
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if (config.HasMember("executor")) {
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const auto &execConf = config["executor"];
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if (!execConf.IsObject())
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throw std::runtime_error("Executor config is not an object");
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if (!execConf.HasMember("name"))
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throw std::runtime_error("Executor config is missing execger name");
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if (!execConf.HasMember("config"))
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throw std::runtime_error("Executor config is missing config");
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std::string name = execConf["name"].GetString();
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const auto &execConfig = execConf["config"];
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if (name == "ForkingTaskExecutor") {
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size_t threads = 10;
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if (execConfig.HasMember("threads"))
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threads = execConfig["threads"].GetInt64();
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return std::make_unique<de::ForkingTaskExecutor>(threads);
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}
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else if (name == "SlurmTaskExecutor") {
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return std::make_unique<de::SlurmTaskExecutor>();
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}
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else
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throw std::runtime_error("Unknown executor type: " + name);
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}
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return std::make_unique<de::ForkingTaskExecutor>(10);
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}
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int main(int argc, char **argv)
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{
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argparse::ArgumentParser args("Daggy");
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args.add_argument("-v", "--verbose")
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.default_value(false)
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.implicit_value(true);
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args.add_argument("-d", "--daemon").default_value(false).implicit_value(true);
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args.add_argument("--config");
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try {
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args.parse_args(argc, argv);
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}
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catch (std::exception &e) {
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std::cout << "Error: " << e.what() << std::endl;
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std::cout << args;
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exit(1);
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}
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bool verbose = args.get<bool>("--verbose");
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bool asDaemon = args.get<bool>("--daemon");
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auto configFile = args.get<std::string>("--config");
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std::ifstream ifh(configFile);
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std::string config;
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std::getline(ifh, config, '\0');
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ifh.close();
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rj::Document doc;
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daggy::checkRJParse(doc.Parse(config.c_str()));
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std::string listenIP = "127.0.0.1";
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int listenPort = 2503;
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size_t webThreads = 50;
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size_t dagThreads = 50;
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if (doc.HasMember("ip"))
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listenIP = doc["ip"].GetString();
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if (doc.HasMember("port"))
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listenPort = doc["port"].GetInt();
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if (doc.HasMember("web-threads"))
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webThreads = doc["web-threads"].GetInt64();
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if (doc.HasMember("dag-threads"))
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dagThreads = doc["dag-threads"].GetInt64();
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if (verbose) {
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std::cout << "Server running at http://" << listenIP << ':' << listenPort
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<< std::endl
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<< "Max DAG Processing: " << dagThreads << std::endl
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<< "Max Web Clients: " << webThreads << std::endl
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<< std::endl
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<< "Ctrl-C to exit" << std::endl;
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}
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if (asDaemon) {
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daemonize();
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}
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auto logger = loggerFactory(doc);
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auto executor = executorFactory(doc);
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Pistache::Address listenSpec(listenIP, listenPort);
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daggy::Server server(listenSpec, *logger, *executor, dagThreads);
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server.init(webThreads);
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server.start();
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running = true;
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while (running) {
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std::this_thread::sleep_for(std::chrono::seconds(30));
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}
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server.shutdown();
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}
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