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#include "peer.h"
using namespace std;
peer* signalHandler;
// Constructor for lru.
peer::peer(char* fileName) {
_fileName = fileName;
_peerNumber = 0;
_sum = 0;
pthread_mutex_init(&_mutex, NULL);
// Creates a new thread that will listens for incoming connections.
pthread_create(&_serverThread, NULL, peer::setServer, (void*) this);
// We set the global variable signal handler so that the static function
// will know which object to use to handle the alarm signal.
signalHandler = this;
// Sets the alarm signal handler.
// Parses the given input file.
parseInputFile();
_iterator = _neighborList.begin();
}
// Sets up the server socket
void peer::setServerSocket() {
// Sets up the socket.
struct addrinfo hints;
struct addrinfo *res;
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE; // Sets my ip adddress.
getaddrinfo(NULL, "1030", &hints, &res);
// Make a socket.
int sockfd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
// Bind the socket to the right port.
bind(sockfd, res->ai_addr, res->ai_addrlen);
// Listen.
listen(sockfd, 10);
while(1) {
struct sockaddr_storage their_addr;
socklen_t addr_size = sizeof their_addr;
int newSocket;
newSocket = accept(sockfd, (struct sockaddr*) &their_addr, &addr_size);
// MAYBE WE NEED TO CREATE ANOTHER THREAD HERE.
char tosend[50];
sprintf(tosend,"%g", _inputValue);
// Send it.
send(newSocket, tosend, strlen(tosend), 0);
// Close the sending socket.
// close(newSocket);
}
}
// Adds its own sum, and then contacts all the other neighbors to
// add sequentially their data.
void peer::computeSum() {
_sum += _inputValue;
_peerNumber++;
while (_iterator != _neighborList.end()) {
pthread_t thread;
// Creates a new thread that will launch the function retrieveNextNode.
pthread_create(&thread, NULL, peer::retrieve_func, (void*) this);
// retrieveNextNode();
// Next time we call retrieveNextNode, will be ready.
_iterator++;
}
}
// Connects to the next node and retrieves its data and try to add it, disconnects when done.
void peer::retrieveNextNode() {
string ipAddress = _iterator->getIp();
string port = _iterator->getPort();
// Sets up the socket.
struct addrinfo hints;
struct addrinfo *res;
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
getaddrinfo("localhost", "1030", &hints, &res);
// getaddrinfo(ipAddress.c_str(), port.c_str(), &hints, &res);
// Make a socket.
int sockfd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
// Connect.
if (connect(sockfd, res->ai_addr, res->ai_addrlen)!= 0) {
cerr << "Error on connection" << endl;
return;
}
// Read the value sent by the other host, and add it to the sum.
char msgReceived[50];
int len = strlen(msgReceived);
recv(sockfd, msgReceived, len, 0);
// Critical section, updates the sum and the number of peers.
pthread_mutex_lock(&_mutex);
_sum += atof(msgReceived);
_peerNumber++;
pthread_mutex_unlock(&_mutex);
// Close the connection to this neighbor.
close(sockfd);
}
void catch_alarm(int sig_num) {
signalHandler->printOutput();
}
peer::~peer() {
}
// Parses the input file and puts all the data in data structures.
void peer::parseInputFile() {
_inputFile.open(_fileName);
string inputValue = getNextLine();
_inputValue = atof(inputValue.c_str());
string threashold = getNextLine();
_threashold = atoi(threashold.c_str());
startTimer();
// THERE IS A PROBLEM WITH PARSING HERE
_port = getNextLine();
// string::iterator it = _port.end() - 1;
// _port.erase(it);
//cout << strlen(_port.c_str());
parseNeighborList();
}
// Starts the timer with the indicated threashold.
void peer::startTimer() {
alarm(_threashold);
}
void peer::parseNeighborList() {
while (!_inputFile.eof()) {
string neighbor = getNextLine();
if (!neighbor.empty()) {
size_t colonSeparator = neighbor.find(":");
string ipAddress = neighbor.substr(0, colonSeparator);
string port = neighbor.substr(colonSeparator+1, neighbor.length() - colonSeparator - 2);
peerAddress toAdd(ipAddress, port);
_neighborList.push_back(toAdd);
}
}
}
// Returns the next non empty line.
string peer::getNextLine() {
// We loop until we find a non empty line.
string trimmed;
do {
_inputFile.getline(_buffer, 256);
trimmed = trimLine(_buffer);
} while(trimmed.length() == 1 && !_inputFile.eof());
return trimmed;
}
string peer::trimLine(const char* toTrim) {
string trimmed = string(toTrim);
// Trims the white spaces.
remove(trimmed.begin(), trimmed.end(), ' ');
return trimmed;
}
void peer::printOutput() {
printf("%f\t%d\n", _sum, _peerNumber);
}
void peer::printDebug() {
cout << "Input value: " << _inputValue << endl;
cout << "Time threashold: " << _threashold << endl;
cout << "Port: " << _port << endl;
cout << "Neighbors list: " << endl;
list<peerAddress>::iterator it;
for (it = _neighborList.begin(); it != _neighborList.end(); it++) {
cout << "Ip: " << it->getIp() << ", port: " << it->getPort() << endl;
}
}
int main(int argc, char **argv)
{
// The text file name is given as an input.
if(argc != 2) {
fprintf(stderr,"usage: peer <filename>\n");
exit(1);
}
signal(SIGALRM, catch_alarm);
peer myPeer(argv[1]);
myPeer.printDebug();
myPeer.computeSum();
pthread_exit(NULL);
return 0;
} |
Pthreads et BSD sockets
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