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mistserver/src/controller/controller.cpp

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/// \file controller.cpp
/// Contains all code for the controller executable.
#include <mist/util.h>
#include "controller_api.h"
#include "controller_capabilities.h"
#include "controller_connectors.h"
#include "controller_statistics.h"
#include "controller_storage.h"
#include "controller_streams.h"
#include <ctime>
#include <iostream>
#include <mist/auth.h>
#include <mist/config.h>
#include <mist/defines.h>
#include <mist/http_parser.h>
#include <mist/procs.h>
#include <mist/shared_memory.h>
#include <mist/socket.h>
#include <mist/stream.h>
#include <mist/timing.h>
#include <mist/tinythread.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <vector>
#ifndef COMPILED_USERNAME
#define COMPILED_USERNAME ""
#define COMPILED_PASSWORD ""
#endif
/// the following function is a simple check if the user wants to proceed to fix (y), ignore (n) or
/// abort on (a) a question
static inline char yna(std::string &user_input){
switch (user_input[0]){
case 'y':
case 'Y': return 'y'; break;
case 'n':
case 'N': return 'n'; break;
case 'a':
case 'A': return 'a'; break;
case 't':
case 'T': return 't'; break;
default: return 'x'; break;
}
}
/// createAccount accepts a string in the form of username:account
/// and creates an account.
void createAccount(std::string account){
if (account.size() > 0){
size_t colon = account.find(':');
if (colon != std::string::npos && colon != 0 && colon != account.size()){
std::string uname = account.substr(0, colon);
std::string pword = account.substr(colon + 1, std::string::npos);
Controller::Log("CONF", "Created account " + uname + " through console interface");
Controller::Storage["account"][uname]["password"] = Secure::md5(pword);
}
}
}
/// Status monitoring thread.
/// Will check outputs, inputs and converters every five seconds
void statusMonitor(void *np){
IPC::semaphore configLock(SEM_CONF, O_CREAT | O_RDWR, ACCESSPERMS, 1);
Controller::loadActiveConnectors();
while (Controller::conf.is_active){
// this scope prevents the configMutex from being locked constantly
{
tthread::lock_guard<tthread::mutex> guard(Controller::configMutex);
bool changed = false;
// checks online protocols, reports changes to status
changed |= Controller::CheckProtocols(Controller::Storage["config"]["protocols"],
Controller::capabilities);
// checks stream statuses, reports changes to status
changed |= Controller::CheckAllStreams(Controller::Storage["streams"]);
// check if the config semaphore is stuck, by trying to lock it for 5 attempts of 1 second...
if (!configLock.tryWaitOneSecond() && !configLock.tryWaitOneSecond() &&
!configLock.tryWaitOneSecond() && !configLock.tryWaitOneSecond()){
// that failed. We now unlock it, no matter what - and print a warning that it was stuck.
WARN_MSG("Configuration semaphore was stuck. Force-unlocking it and re-writing config.");
changed = true;
}
configLock.unlink();
configLock.open(SEM_CONF, O_CREAT | O_RDWR, ACCESSPERMS, 1);
if (changed || Controller::configChanged){
Controller::writeConfig();
Controller::configChanged = false;
}
}
Util::sleep(5000); // wait at least 5 seconds
}
if (Controller::restarting){
Controller::prepareActiveConnectorsForReload();
}else{
Controller::prepareActiveConnectorsForShutdown();
}
configLock.unlink();
}
static unsigned long mix(unsigned long a, unsigned long b, unsigned long c){
a = a - b;
a = a - c;
a = a ^ (c >> 13);
b = b - c;
b = b - a;
b = b ^ (a << 8);
c = c - a;
c = c - b;
c = c ^ (b >> 13);
a = a - b;
a = a - c;
a = a ^ (c >> 12);
b = b - c;
b = b - a;
b = b ^ (a << 16);
c = c - a;
c = c - b;
c = c ^ (b >> 5);
a = a - b;
a = a - c;
a = a ^ (c >> 3);
b = b - c;
b = b - a;
b = b ^ (a << 10);
c = c - a;
c = c - b;
c = c ^ (b >> 15);
return c;
}
///\brief The main loop for the controller.
int main_loop(int argc, char **argv){
Controller::isTerminal = Controller::isColorized = isatty(fileno(stdout));
if (!isatty(fileno(stdin))){Controller::isTerminal = false;}
Controller::Storage = JSON::fromFile("config.json");
JSON::Value stored_port =
JSON::fromString("{\"long\":\"port\", \"short\":\"p\", \"arg\":\"integer\", \"help\":\"TCP "
"port to listen on.\"}");
stored_port["default"] = Controller::Storage["config"]["controller"]["port"];
if (!stored_port["default"]){stored_port["default"] = 4242;}
JSON::Value stored_interface = JSON::fromString(
"{\"long\":\"interface\", \"short\":\"i\", \"arg\":\"string\", \"help\":\"Interface address "
"to listen on, or 0.0.0.0 for all available interfaces.\"}");
stored_interface["default"] = Controller::Storage["config"]["controller"]["interface"];
if (!stored_interface["default"]){stored_interface["default"] = "0.0.0.0";}
JSON::Value stored_user =
JSON::fromString("{\"long\":\"username\", \"short\":\"u\", \"arg\":\"string\", "
"\"help\":\"Username to transfer privileges to, default is root.\"}");
stored_user["default"] = Controller::Storage["config"]["controller"]["username"];
if (!stored_user["default"]){stored_user["default"] = "root";}
Controller::conf.addOption("port", stored_port);
Controller::conf.addOption("interface", stored_interface);
Controller::conf.addOption("username", stored_user);
Controller::conf.addOption(
"account", JSON::fromString("{\"long\":\"account\", \"short\":\"a\", \"arg\":\"string\" "
"\"default\":\"\", \"help\":\"A username:password string to "
"create a new account with.\"}"));
Controller::conf.addOption(
"logfile", JSON::fromString("{\"long\":\"logfile\", \"short\":\"L\", \"arg\":\"string\" "
"\"default\":\"\",\"help\":\"Redirect all standard output to a "
"log file, provided with an argument\"}"));
Controller::conf.addOption(
"configFile", JSON::fromString("{\"long\":\"config\", \"short\":\"c\", \"arg\":\"string\" "
"\"default\":\"config.json\", \"help\":\"Specify a config "
"file other than default.\"}"));
Controller::conf.parseArgs(argc, argv);
if (Controller::conf.getString("logfile") != ""){
// open logfile, dup stdout to logfile
int output =
open(Controller::conf.getString("logfile").c_str(), O_APPEND | O_CREAT | O_WRONLY, S_IRWXU);
if (output < 0){
DEBUG_MSG(DLVL_ERROR, "Could not redirect output to %s: %s",
Controller::conf.getString("logfile").c_str(), strerror(errno));
return 7;
}else{
Controller::isTerminal = Controller::isColorized = false;
dup2(output, STDOUT_FILENO);
dup2(output, STDERR_FILENO);
time_t rawtime;
struct tm *timeinfo;
struct tm tmptime;
char buffer[25];
time(&rawtime);
timeinfo = localtime_r(&rawtime, &tmptime);
strftime(buffer, 25, "%c", timeinfo);
std::cerr << std::endl
<< std::endl
<< "!----MistServer Started at " << buffer << " ----!" << std::endl;
}
}
// reload config from config file
Controller::Storage = JSON::fromFile(Controller::conf.getString("configFile"));
{// spawn thread that reads stderr of process
std::string logPipe = Util::getTmpFolder()+"MstLog";
if (mkfifo(logPipe.c_str(), S_IWUSR | S_IRUSR | S_IRGRP | S_IROTH) != 0){
if (errno != EEXIST){
ERROR_MSG("Could not create log message pipe %s: %s", logPipe.c_str(), strerror(errno));
}
}
int inFD = -1;
if ((inFD = open(logPipe.c_str(), O_RDONLY | O_NONBLOCK)) == -1){
ERROR_MSG("Could not open log message pipe %s: %s; falling back to unnamed pipe", logPipe.c_str(), strerror(errno));
int pipeErr[2];
if (pipe(pipeErr) >= 0){
dup2(pipeErr[1], STDERR_FILENO); // cause stderr to write to the pipe
close(pipeErr[1]); // close the unneeded pipe file descriptor
//Start reading log messages from the unnamed pipe
Util::Procs::socketList.insert(pipeErr[0]); //Mark this FD as needing to be closed before forking
tthread::thread msghandler(Controller::handleMsg, (void *)(((char *)0) + pipeErr[0]));
msghandler.detach();
}
}else{
//Set the read end to blocking mode
int inFDflags = fcntl(inFD, F_GETFL, 0);
fcntl(inFD, F_SETFL, inFDflags & (~O_NONBLOCK));
//Start reading log messages from the named pipe
Util::Procs::socketList.insert(inFD); //Mark this FD as needing to be closed before forking
tthread::thread msghandler(Controller::handleMsg, (void *)(((char *)0) + inFD));
msghandler.detach();
//Attempt to open and redirect log messages to named pipe
int outFD = -1;
if ((outFD = open(logPipe.c_str(), O_WRONLY)) == -1){
ERROR_MSG("Could not open log message pipe %s for writing! %s; falling back to standard error", logPipe.c_str(), strerror(errno));
}else{
dup2(outFD, STDERR_FILENO); // cause stderr to write to the pipe
close(outFD); // close the unneeded pipe file descriptor
}
}
setenv("MIST_CONTROL", "1", 0);//Signal in the environment that the controller handles all children
}
if (Controller::conf.getOption("debug", true).size() > 1){
Controller::Storage["config"]["debug"] = Controller::conf.getInteger("debug");
}
if (Controller::Storage.isMember("config") && Controller::Storage["config"].isMember("debug") &&
Controller::Storage["config"]["debug"].isInt()){
Util::Config::printDebugLevel = Controller::Storage["config"]["debug"].asInt();
}
// check for port, interface and username in arguments
// if they are not there, take them from config file, if there
if (Controller::Storage["config"]["controller"]["port"]){
Controller::conf.getOption("port", true)[0u] =
Controller::Storage["config"]["controller"]["port"];
}
if (Controller::Storage["config"]["controller"]["interface"]){
Controller::conf.getOption("interface", true)[0u] =
Controller::Storage["config"]["controller"]["interface"];
}
if (Controller::Storage["config"]["controller"]["username"]){
Controller::conf.getOption("username", true)[0u] =
Controller::Storage["config"]["controller"]["username"];
}
{
IPC::semaphore configLock(SEM_CONF, O_CREAT | O_RDWR, ACCESSPERMS, 1);
configLock.unlink();
}
Controller::writeConfig();
Controller::checkAvailProtocols();
createAccount(Controller::conf.getString("account"));
Controller::conf.activate(); // activate early, so threads aren't killed.
// if a terminal is connected and we're not logging to file
if (Controller::isTerminal){
// check for username
if (!Controller::Storage.isMember("account") || Controller::Storage["account"].size() < 1){
std::string in_string = "";
while (yna(in_string) == 'x' && Controller::conf.is_active){
std::cout << "Account not set, do you want to create an account? (y)es, (n)o, (a)bort: ";
std::cout.flush();
std::getline(std::cin, in_string);
switch (yna(in_string)){
case 'y':{
// create account
std::string usr_string = "";
while (!(Controller::Storage.isMember("account") &&
Controller::Storage["account"].size() > 0) &&
Controller::conf.is_active){
std::cout << "Please type in the username, a colon and a password in the following "
"format; username:password"
<< std::endl
<< ": ";
std::cout.flush();
std::getline(std::cin, usr_string);
createAccount(usr_string);
}
}break;
case 'a':
return 0; // abort bootup
case 't':{
createAccount("test:test");
if ((Controller::capabilities["connectors"].size()) &&
(!Controller::Storage.isMember("config") ||
!Controller::Storage["config"].isMember("protocols") ||
Controller::Storage["config"]["protocols"].size() < 1)){
// create protocols
jsonForEach(Controller::capabilities["connectors"], it){
if (!it->isMember("required")){
JSON::Value newProtocol;
newProtocol["connector"] = it.key();
Controller::Storage["config"]["protocols"].append(newProtocol);
}
}
}
}break;
}
}
}
// check for protocols
if ((Controller::capabilities["connectors"].size()) &&
(!Controller::Storage.isMember("config") ||
!Controller::Storage["config"].isMember("protocols") ||
Controller::Storage["config"]["protocols"].size() < 1)){
std::string in_string = "";
while (yna(in_string) == 'x' && Controller::conf.is_active){
std::cout
<< "Protocols not set, do you want to enable default protocols? (y)es, (n)o, (a)bort: ";
std::cout.flush();
std::getline(std::cin, in_string);
if (yna(in_string) == 'y'){
// create protocols
jsonForEach(Controller::capabilities["connectors"], it){
if (!it->isMember("required")){
JSON::Value newProtocol;
newProtocol["connector"] = it.key();
Controller::Storage["config"]["protocols"].append(newProtocol);
}
}
}else if (yna(in_string) == 'a'){
// abort controller startup
return 0;
}
}
}
}
// Check if we have a usable server, if not, print messages with helpful hints
{
std::string web_port = JSON::Value((long long)Controller::conf.getInteger("port")).asString();
// check for username
if (!Controller::Storage.isMember("account") || Controller::Storage["account"].size() < 1){
Controller::Log("CONF",
"No login configured. To create one, attempt to login through the web "
"interface on port " +
web_port + " and follow the instructions.");
}
// check for protocols
if (!Controller::Storage.isMember("config") ||
!Controller::Storage["config"].isMember("protocols") ||
Controller::Storage["config"]["protocols"].size() < 1){
Controller::Log(
"CONF",
"No protocols enabled, remember to set them up through the web interface on port " +
web_port + " or API.");
}
// check for streams - regardless of logfile setting
if (!Controller::Storage.isMember("streams") || Controller::Storage["streams"].size() < 1){
Controller::Log(
"CONF",
"No streams configured, remember to set up streams through the web interface on port " +
web_port + " or API.");
}
}
Controller::Log("CONF", "Controller started");
// Generate instanceId once per boot.
if (Controller::instanceId == ""){
srand(mix(clock(), time(0), getpid()));
do{
Controller::instanceId += (char)(64 + rand() % 62);
}while (Controller::instanceId.size() < 16);
}
// start stats thread
tthread::thread statsThread(Controller::SharedMemStats, &Controller::conf);
// start monitoring thread
tthread::thread monitorThread(statusMonitor, 0);
// start main loop
while (Controller::conf.is_active){
Controller::conf.serveThreadedSocket(Controller::handleAPIConnection);
// print shutdown reason
std::string shutdown_reason;
if (!Controller::conf.is_active){
shutdown_reason = "user request (received shutdown signal)";
}else{
shutdown_reason = "socket problem (API port closed)";
}
if (Controller::restarting){shutdown_reason = "restart (on request)";}
Controller::conf.is_active = false;
Controller::Log("CONF", "Controller shutting down because of " + shutdown_reason);
}
// join all joinable threads
HIGH_MSG("Joining stats thread...");
statsThread.join();
HIGH_MSG("Joining monitor thread...");
monitorThread.join();
// write config
tthread::lock_guard<tthread::mutex> guard(Controller::logMutex);
Controller::writeConfigToDisk();
// stop all child processes
Util::Procs::StopAll();
// give everything some time to print messages
Util::wait(100);
std::cout << "Killed all processes, wrote config to disk. Exiting." << std::endl;
if (Controller::restarting){return 42;}
// close stderr to make the stderr reading thread exit
close(STDERR_FILENO);
return 0;
}
void handleUSR1(int signum, siginfo_t *sigInfo, void *ignore){
Controller::Log("CONF", "USR1 received - restarting controller");
Controller::restarting = true;
raise(SIGINT); // trigger restart
}
///\brief The controller angel process.
/// Starts a forked main_loop in a loop. Yes, you read that right.
int main(int argc, char **argv){
Util::Procs::setHandler(); // set child handler
{
struct sigaction new_action;
struct sigaction cur_action;
new_action.sa_sigaction = handleUSR1;
sigemptyset(&new_action.sa_mask);
new_action.sa_flags = 0;
sigaction(SIGUSR1, &new_action, NULL);
}
Controller::conf = Util::Config(argv[0]);
Controller::conf.activate();
uint64_t reTimer = 0;
while (Controller::conf.is_active){
pid_t pid = fork();
if (pid == 0){
Util::Procs::handler_set = false;
Util::Procs::reaper_thread = 0;
{
struct sigaction new_action;
struct sigaction cur_action;
new_action.sa_sigaction = handleUSR1;
sigemptyset(&new_action.sa_mask);
new_action.sa_flags = 0;
sigaction(SIGUSR1, &new_action, NULL);
}
return main_loop(argc, argv);
}
if (pid == -1){
FAIL_MSG("Unable to spawn controller process!");
return 2;
}
// wait for the process to exit
int status;
while (waitpid(pid, &status, 0) != pid && errno == EINTR){
if (Controller::restarting){
Controller::conf.is_active = true;
Controller::restarting = false;
kill(pid, SIGUSR1);
}
if (!Controller::conf.is_active){
INFO_MSG("Shutting down controller because of signal interrupt...");
Util::Procs::Stop(pid);
}
continue;
}
// if the exit was clean, don't restart it
if (WIFEXITED(status) && (WEXITSTATUS(status) == 0)){
MEDIUM_MSG("Controller shut down cleanly");
break;
}
if (WIFEXITED(status) && (WEXITSTATUS(status) == 42)){
WARN_MSG("Refreshing angel process for update");
std::string myFile = Util::getMyPath() + "MistController";
execvp(myFile.c_str(), argv);
FAIL_MSG("Error restarting: %s", strerror(errno));
}
INFO_MSG("Controller uncleanly shut down! Restarting in %llu...", reTimer);
Util::wait(reTimer);
reTimer += 1000;
}
return 0;
}
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