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client.cpp
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client.cpp
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#include <iostream>
#include <thread>
#include <vector>
#include <cassert>
#include <cmath>
#include <cstring>
#include <unordered_map>
#include <netinet/in.h>
#include <libnet.h>
#include <algorithm>
#include "utils.h"
#define CMD_SHARE "share"
#define CMD_GET "get"
#define REQUEST_BITVECTOR 100
#define REQUEST_DATA 101
#define QUIT "q"
#define SOCKET_ADDR(x, y) (x+":"+y)
using namespace std;
string myNodeId;
struct SuccessorNode {
string socketAddr;
string nodeId;
};
string myIp, myPort, defaultTracker;
// <hash, bitvector>
unordered_map<string, string> hashPieces;
// <hash, localFilePath>
unordered_map<string, string> hashPath;
void updateSeederLeecherStatusOnTracker(const string &msgType, const string &shaOfSha, vector<string> &trackers);
void servePeerRequest(int newsocket, struct sockaddr_in newAddr) {
cout << "Received request from PEER: "
<< inet_ntoa(newAddr.sin_addr) << ":" << ntohs(newAddr.sin_port) << endl;
int requestType;
recv(newsocket, &requestType, sizeof(requestType), 0);
if (requestType == REQUEST_BITVECTOR) {
char shaOfShaBuffer[41];
recv(newsocket, &shaOfShaBuffer, 40, 0);
shaOfShaBuffer[40] = '\0';
string shaOfSha = string(shaOfShaBuffer);
cout << "Peer requesting for bitvector of " << shaOfSha << endl;
string bitVector = hashPieces[shaOfSha];
send(newsocket, bitVector.c_str(), bitVector.size(), 0);
} else if (requestType == REQUEST_DATA) {
char shaOfShaBuffer[41];
recv(newsocket, &shaOfShaBuffer, 40, 0);
shaOfShaBuffer[40] = '\0';
string shaOfSha = string(shaOfShaBuffer);
int pieceId = -1;
recv(newsocket, &pieceId, sizeof(pieceId), 0);
cout << "Peer requesting for piece: " << pieceId
<< " of file: " << hashPath[shaOfSha]
<< " with hash: " << shaOfSha << endl;
int fileSize = getFileSize(hashPath[shaOfSha]);
int numPieces = ceil((float) fileSize / (float) PIECE_SIZE);
bool isLastPiece = pieceId == numPieces - 1;
int currentPieceSize = isLastPiece ?
fileSize - ((numPieces - 1) * PIECE_SIZE) :
PIECE_SIZE;
// Each individual piece is sent in small chunks
int numChunks = ceil((float) currentPieceSize / (float) CHUNK_SIZE);
send(newsocket, &numChunks, sizeof(numChunks), 0);
int pieceOffset = pieceId * PIECE_SIZE;
ifstream infile(hashPath[shaOfSha], ios_base::binary);
// Seek to beginning of requested piece
infile.seekg(pieceOffset);
for (int chunkid = 0; chunkid < numChunks; chunkid++) {
cout << "\t Sending chunk: " << chunkid << " of piece: " << pieceId << endl;
bool isLastChunk = chunkid == numChunks - 1;
int currentChunkSize = isLastChunk ?
currentPieceSize - ((numChunks - 1) * CHUNK_SIZE) :
CHUNK_SIZE;
char chunkBuffer[currentChunkSize + 1];
memset(chunkBuffer, '\0', currentChunkSize + 1);
infile.read(chunkBuffer, currentChunkSize);
cout << "\t\t chunk: " << chunkid << " size: " << currentChunkSize << endl;
// cout << "\t\t chunk: " << chunkid << " data: " << chunkBuffer << endl;
send(newsocket, ¤tChunkSize, sizeof(currentChunkSize), 0);
send(newsocket, &chunkBuffer, currentChunkSize, 0);
cout << "\t Sent chunk: " << chunkid << " of piece: " << pieceId << endl;
// Implement ack based handing
// Since send() is non blocking the peer sends too many buffers to
// requester whereas receive is blocking and the pending request queue at receiver overflows
// leading to segfault.
// sleeping is a bad way of allowing receiver enough time to process the packet
// a better way would be to implement ack based communication flow
// where sender waits for the ack of previously sent packet before sending more packets
// sleep(1);
// Wait for acknowledgement of this chunk
int ack = 0;
recv(newsocket, &ack, sizeof(ack), 0);
cout << "\t Received ack for chunk: " << chunkid << " of piece: " << pieceId << endl;
cout << "Total Pieces: " << numPieces << endl;
}
infile.close();
}
close(newsocket);
}
void peerServer() {
int socketFD;
struct sockaddr_in serveraddr{};
socketFD = socket(AF_INET, SOCK_STREAM, 0);
if (socketFD < 0) {
cout << "Error in connect" << endl;
exit(1);
}
memset(&serveraddr, '\0', sizeof(serveraddr));
serveraddr.sin_family = AF_INET;
serveraddr.sin_port = htons(stoi(myPort));
// Can't use INADDR_ANY bcoz have to tell my ip to trackers so that other peers could find me
serveraddr.sin_addr.s_addr = inet_addr(myIp.c_str());
if (bind(socketFD, (struct sockaddr *) &serveraddr, sizeof(serveraddr)) < 0) {
cout << "Error in bind" << endl;
exit(1);
}
if (listen(socketFD, MAX_PENDING_REQUESTS) < 0) {
cout << "Error in listen" << endl;
exit(1);
}
struct sockaddr_in newAddr{};
int newsocket;
socklen_t addr_size;
addr_size = sizeof(newAddr);
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wmissing-noreturn"
while (true) {
newsocket = accept(socketFD, (struct sockaddr *) &newAddr, &addr_size);
if (newsocket >= 0) {
thread peerThread(servePeerRequest,
newsocket,
newAddr);
peerThread.detach();
}
}
#pragma clang diagnostic pop
}
void fillFieldsFromMtorrentFile(const string &mTorrentFilePath,
vector<string> &trackers,
string &fileSize,
string &hash) {
// Hash = 40 char sha1 of each piece
ifstream infile(mTorrentFilePath);
getline(infile, fileSize); // skips filename
getline(infile, fileSize);
getline(infile, hash);
string tracker;
while (getline(infile, tracker)) {
if (tracker.empty())
continue;
trackers.push_back(tracker);
}
cout << "Read from " << mTorrentFilePath << endl;
cout << " fileSize " << fileSize << endl;
cout << " hash " << hash << endl;
for (int i = 0; i < (int) trackers.size(); i++)
cout << " tracker" << i + 1 << " " << trackers[i] << endl;
infile.close();
}
string getSeedersFromTracker(const string &shaOfSha, vector<string> &trackers) {
cout << "Inside getSeedersFromTracker" << endl;
int socketFD;
struct sockaddr_in serverAddress{};
socketFD = socket(AF_INET, SOCK_STREAM, 0);// TODO: switch to UDP
if (socketFD < 0) {
cerr << "\tError in creating Socket" << endl;
exit(1);
}
bool connectedToTracker = false;
for (const auto &trackerSocketAddr: trackers) {
vector<string> tokens = getTokens(trackerSocketAddr, ':');
assert(!tokens.empty());
memset(&serverAddress, '\0', sizeof(serverAddress));
serverAddress.sin_family = AF_INET;
serverAddress.sin_port = htons(stoi(tokens[1]));
serverAddress.sin_addr.s_addr = inet_addr(tokens[0].c_str());
cout << "\tConnecting to tracker: " << trackerSocketAddr << endl;
if (connect(socketFD, (struct sockaddr *) &serverAddress, sizeof(serverAddress)) < 0) {
cout << "\tTracker: " << trackerSocketAddr << " is down." << endl;
} else {
connectedToTracker = true;
break;
}
}
if (!connectedToTracker) {
cout << "\tAll trackers are down" << endl;
exit(1);
}
stringstream ss;
ss << MSG_SEEDERLIST << FIELD_SEPARATOR;
ss << shaOfSha << FIELD_SEPARATOR;
ss << myIp << FIELD_SEPARATOR;
ss << myPort << FIELD_SEPARATOR;
string msg = ss.str();
int msgLength = msg.length();
// First send size of the msg to be received by tracker
send(socketFD, &msgLength, sizeof(msgLength), 0);
// Send the actual msg
send(socketFD, msg.c_str(), msgLength, 0);
int responseLength;
recv(socketFD, &responseLength, sizeof(responseLength), 0);
char responseBuffer[responseLength + 1];
recv(socketFD, responseBuffer, msgLength, 0);
responseBuffer[responseLength] = '\0';
cout << "\tReceived response: " << responseBuffer << endl;
close(socketFD);
return responseBuffer;
}
void downloadPeerPieceInfo(const string &peerSocketAddr, const string &shaOfSha, string &peerBitVector) {
cout << "Connecting to peer " << peerSocketAddr << endl;
// tokens[0] = IP Address, tokens[1] = Port
vector<string> tokens = getTokens(peerSocketAddr, ':');
int socketFD;
struct sockaddr_in serverAddr{};
// Connect to peer over TCP
socketFD = socket(AF_INET, SOCK_STREAM, 0);
if (socketFD < 0) {
cerr << "Socket error: " << errno << endl;
exit(1);
}
memset(&serverAddr, '\0', sizeof(serverAddr));
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(stoi(tokens[1]));
serverAddr.sin_addr.s_addr = inet_addr(tokens[0].c_str());
if (connect(socketFD, (struct sockaddr *) &serverAddr, sizeof(serverAddr)) < 0) {
cout << "Connect error: " << errno << endl;
exit(1);
}
int requestType = REQUEST_BITVECTOR;
send(socketFD, &requestType, sizeof(int), 0);
send(socketFD, shaOfSha.c_str(), shaOfSha.length(), 0);
char bufferVector[peerBitVector.length() + 1];
recv(socketFD, bufferVector, peerBitVector.length(), 0);
bufferVector[peerBitVector.length()] = '\0';
peerBitVector = bufferVector;
close(socketFD);
}
bool rarestFirstCmp(pair<int, vector<int>> &a, pair<int, vector<int>> &b) {
return a.second.size() < b.second.size();
}
void pieceSelectionAlgo(vector<string> &peerList,
vector<string> &peerBitVectors,
vector<vector<int>> &peerToPiecesMap) {
// TODO: Implement rarest first algo
// Peers are 0 based indexed
// Pieces are 0 based indexed
// Currently first peer found with the piece is set as piece provider
int numPeers = peerBitVectors.size();
int numPieces = peerBitVectors[0].size();
// <pieceNumber, list of peers>
vector<pair<int, vector<int>>> pieceToPeersMapping;
for (int pieceNumber = 0; pieceNumber < numPieces; pieceNumber++) {
vector<int> peersContainingThisPiece;
for (int peerId = 0; peerId < numPeers; peerId++) {
string bitVector = peerBitVectors[peerId];
if (bitVector[pieceNumber] == '1') {
// TODO: Push back piece number in order of piece download priority
peersContainingThisPiece.push_back(peerId);
}
}
pieceToPeersMapping.emplace_back(pieceNumber, peersContainingThisPiece);
}
cout << "pieceToPeersMapping before sort: " << endl;
for (const auto &e: pieceToPeersMapping) {
cout << e.first << " -> ";
for (auto i: e.second)
cout << i << " ";
cout << endl;
}
sort(pieceToPeersMapping.begin(), pieceToPeersMapping.end(), rarestFirstCmp);
cout << "pieceToPeersMapping after sort: " << endl;
for (const auto &e: pieceToPeersMapping) {
cout << e.first << " -> ";
for (auto i: e.second)
cout << i << " ";
cout << endl;
}
// rarest piece is at the front of list
for (const auto &e:pieceToPeersMapping) {
int pieceNumber = e.first;
vector<int> peers = e.second;
int idx = getRandom(0, (int) peers.size() - 1);// generate in range [0, peers.size)
assert(idx < (int) peers.size());
assert(peers[idx] < (int) peerToPiecesMap.size());
peerToPiecesMap[peers[idx]].push_back(pieceNumber);
}
}
vector<string> getPeerBitVectors(vector<string> &peerList, const string &shaOfSha, int numPieces) {
// Initialize empty peerBitVectors
vector<string> peerBitVectors(peerList.size(), string(numPieces, '0'));
for (auto i = 0; i < (int) peerBitVectors.size(); i++) {
cout << "peerBitVectors of " << peerList[i] << " before: " << peerBitVectors[i] << endl;
}
// Contact each peer on separate threads
auto *peerPieceInfoThreads = new thread[peerList.size()];
for (int i = 0; i < (int) peerList.size(); i++) {
peerPieceInfoThreads[i] = thread(downloadPeerPieceInfo, peerList[i], shaOfSha, ref(peerBitVectors[i]));
}
for (int i = 0; i < (int) peerList.size(); i++) {
peerPieceInfoThreads[i].join();
}
delete[] peerPieceInfoThreads;
for (auto i = 0; i < (int) peerBitVectors.size(); i++) {
cout << "peerBitVectors of " << peerList[i] << " after: " << peerBitVectors[i] << endl;
}
return peerBitVectors;
}
// Each thread belong to a single peer
// Downloads all pieces to get from this peer
void pieceDownloader(const string &fileNameToSave,
const string &peerSocketAddress,
const vector<int> &piecesToGet,
const string &shaOfSha,
const string &fileSize) {
int outfile = open(fileNameToSave.c_str(),
O_RDWR | O_CREAT, 0777);
cout << "Downloading pieces from peer: " << peerSocketAddress << endl;
for (auto pieceId:piecesToGet) {
cout << "\t Downloading piece " << pieceId << " from peer: " << peerSocketAddress << endl;
int socketFD;
struct sockaddr_in serverAddr{};
socketFD = socket(AF_INET, SOCK_STREAM, 0);
if (socketFD < 0) {
cout << "Error in creating Socket for" << peerSocketAddress << endl;
exit(1);
}
vector<string> tokens = getTokens(peerSocketAddress, ':');
string ip = tokens[0], port = tokens[1];
memset(&serverAddr, '\0', sizeof(serverAddr));
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(stoi(port));
serverAddr.sin_addr.s_addr = inet_addr(ip.c_str());
if (connect(socketFD, (struct sockaddr *) &serverAddr, sizeof(serverAddr)) < 0) {
cout << "Connect error for " << peerSocketAddress << endl;
exit(1);
}
int requestType = REQUEST_DATA;
send(socketFD, &requestType, sizeof(int), 0);
send(socketFD, shaOfSha.c_str(), shaOfSha.length(), 0);
// Send piece number of the file requested
send(socketFD, &pieceId, sizeof(pieceId), 0);
int numChunksToReceive = -1;
recv(socketFD, &numChunksToReceive, sizeof(numChunksToReceive), 0);
int currentPieceOffset = pieceId * PIECE_SIZE;
// Seek to beginning of current piece
lseek(outfile, currentPieceOffset, SEEK_SET);
// loop to receive each chunk
for (int chunkid = 0; chunkid < numChunksToReceive; chunkid++) {
cout << "\t\t Downloading chunk: " << chunkid << " of piece: " << pieceId << endl;
int chunkSize = -1;
recv(socketFD, &chunkSize, sizeof(chunkSize), 0);
// FIXME: Use Byte buffer instead of char buffer
char chunkBuffer[chunkSize + 1];
memset(chunkBuffer, '\0', chunkSize + 1);
recv(socketFD, chunkBuffer, chunkSize, 0);
cout << "\t\t Received chunk: " << chunkid << " of piece: " << pieceId << endl;
cout << "\t\t chunk: " << chunkid << " size: " << chunkSize << endl;
// cout << "\t\t chunk: " << chunkid << " data: " << chunkBuffer << endl;
write(outfile, chunkBuffer, chunkSize);
cout << "\t\t Written chunk: " << chunkid << " of piece: " << pieceId << " to file" << endl;
// Send for acknowledgement of this chunk
int ack = 1;
send(socketFD, &ack, sizeof(ack), 0);
cout << "\t\t Ack sent." << endl;
}
close(socketFD);
hashPieces[shaOfSha][pieceId] = '1';
}
close(outfile);
}
void downloadFile(const string &mTorrentFilePath, const string &fileNameToSave) {
cout << "Here2 downloadFile" << endl;
vector<string> trackers;
string hash; // needed to verify each piece of data to be received
string fileSize;
fillFieldsFromMtorrentFile(mTorrentFilePath,
trackers,
fileSize,
hash);
// needed to identify peer list on
string shaOfSha = getSHAofSHA(hash);
cout << "getting shaOfSha: " << shaOfSha << endl;
// Step 1: Get seedersAndLeechers list
string seedersString = getSeedersFromTracker(shaOfSha, trackers);
vector<string> peerList = getTokens(seedersString, FIELD_SEPARATOR);
cout << "List of seeders: " << endl;
for (const auto &i:peerList)
cout << "\t" << i << endl;
// Step 2: I am now a leecher for this file
// so notify tracker that I can serve this file in future
updateSeederLeecherStatusOnTracker(MSG_ADD, shaOfSha, trackers);
int numPieces = ceil(stof(fileSize) / (float) PIECE_SIZE);
// bitvector of all zeroes coz I am yet to begin download
string bitvector(numPieces, '0');
hashPieces[shaOfSha] = bitvector;
hashPath[shaOfSha] = fileNameToSave;
// TODO: Step 3: Get file from peers
// - Contact each peer on separate threads to get who contains what piece of the file
// - PieceSelectionAlgo: Decide which piece to fetch from whom
// - Simultaneously download pieces from different peers
// - Update bitvector when a piece download completes
// - Retry failed pieces from different peer.
// Step 3.1: Contact each peer on separate threads to get who contains what piece of the file
vector<string> peerBitVectors = getPeerBitVectors(peerList, shaOfSha, numPieces);
// Step 3.2: PieceSelectionAlgo: Decide which piece to fetch from whom
vector<vector<int>> peerPiecesToGet(peerList.size(), vector<int>());
pieceSelectionAlgo(peerList, peerBitVectors, peerPiecesToGet);
for (int peerId = 0; peerId < (int) peerPiecesToGet.size(); peerId++) {
cout << "Pieces to be fetched from peer " << peerId << " :";
for (auto e: peerPiecesToGet[peerId])
cout << e << " ";
cout << endl;
}
auto *pieceDownloaderThreads = new thread[peerList.size()];
for (int i = 0; i < (int) peerList.size(); i++) {
pieceDownloaderThreads[i] = thread(pieceDownloader,
fileNameToSave,
peerList[i],
peerPiecesToGet[i],
shaOfSha,
fileSize);
}
for (int i = 0; i < (int) peerList.size(); i++) {
pieceDownloaderThreads[i].join();
}
delete[] pieceDownloaderThreads;
cout << "Downloaded file: " << fileNameToSave << endl;
}
// Creates torrent file for `filePath` and populates `hash` and `trackers`.
void createTorrentFile(const string &filePath, const string &mTorrentFileName,
string &hash, vector<string> &trackers) {
hash = getHash(filePath);
int fileSize = getFileSize(filePath);
ofstream mTorrentFile(mTorrentFileName, ios_base::ate);
mTorrentFile << getFileNameFromPath(filePath) << endl;
mTorrentFile << fileSize << endl;
mTorrentFile << hash << endl;
while (true) {
string trackerSocket;
cout << "Enter tracker's socket address default(" << defaultTracker << ")." << endl
<< "type " << QUIT << " to quit: ";
getline(cin, trackerSocket);
if (trackerSocket.empty())
trackerSocket = defaultTracker;
else if (trackerSocket == QUIT)
break;
mTorrentFile << trackerSocket << endl;
trackers.push_back(trackerSocket);
}
mTorrentFile.close();
}
void updateSeederLeecherStatusOnTracker(const string &msgType,
const string &shaOfSha,
vector<string> &trackers) {
cout << "Inside updateSeederLeecherStatusOnTracker" << endl;
int socketFD;
struct sockaddr_in serverAddress{};
socketFD = socket(AF_INET, SOCK_STREAM, 0);// TODO: switch to UDP
if (socketFD < 0) {
cerr << "\tError in creating Socket" << endl;
exit(1);
}
bool connectedToTracker = false;
for (const auto &trackerSocketAddr: trackers) {
vector<string> tokens = getTokens(trackerSocketAddr, ':');
assert(!tokens.empty());
memset(&serverAddress, '\0', sizeof(serverAddress));
serverAddress.sin_family = AF_INET;
serverAddress.sin_port = htons(stoi(tokens[1]));
serverAddress.sin_addr.s_addr = inet_addr(tokens[0].c_str());
cout << "\tConnecting to tracker: " << trackerSocketAddr << endl;
if (connect(socketFD, (struct sockaddr *) &serverAddress, sizeof(serverAddress)) < 0) {
cout << "\tTracker: " << trackerSocketAddr << " is down." << endl;
} else {
connectedToTracker = true;
break;
}
}
if (!connectedToTracker) {
cout << "\tAll trackers are down" << endl;
exit(1);
}
stringstream ss;
ss << msgType << FIELD_SEPARATOR;
ss << shaOfSha << FIELD_SEPARATOR;
ss << myIp << FIELD_SEPARATOR;
ss << myPort << FIELD_SEPARATOR;
string msg = ss.str();
int msgLength = msg.length();
// First send size of the msg to be received by tracker
send(socketFD, &msgLength, sizeof(msgLength), 0);
// Send the actual msg
send(socketFD, msg.c_str(), msgLength, 0);
cout << "\tStatus updated." << endl;
close(socketFD);
}
void clientMenu() {
while (true) {
string line;
cout << "Enter command: ";
getline(cin, line);
cout << "line: " << line << endl;
if (line.empty())
continue; // skip loop
vector<string> tokens = getTokens(line, ' ');
if (tokens[0] == CMD_SHARE) {
// command: share pathOfFileToShare mtorrentFileName
assert(tokens.size() == 3);
string hash;
vector<string> trackers;
createTorrentFile(tokens[1], tokens[2], hash, trackers);
string shaOfsha = getSHAofSHA(hash);
int numPieces = ceil((float) getFileSize(tokens[1]) / (float) PIECE_SIZE);
string bitvector(numPieces, '1');// bitvector of all ones coz I shared it
hashPieces[shaOfsha] = bitvector;
hashPath[shaOfsha] = tokens[1];
// Notify tracker that I am serving this file
updateSeederLeecherStatusOnTracker(MSG_ADD, shaOfsha, trackers);
} else if (tokens[0] == CMD_GET) {
cout << "Here2 clientMenu" << endl;
// command: get mtorrentFilePath fileNameToSave
assert(tokens.size() == 3);
// Handle command in separate thread to make asynchronous download possible
thread downloaderThread(downloadFile, tokens[1], tokens[2]);
downloaderThread.detach();
} else {
cout << "Invalid command" << endl;
// TODO: write to logs before exiting
break;
}
}
}
int main(int argc, char **argv) {
auto tokens = getTokens(argv[1], ':');
myIp = tokens[0];
myPort = tokens[1];
defaultTracker = argv[2];
myNodeId = getNodeId(SOCKET_ADDR(myIp, myPort));
cout << "myNodeId: " << myNodeId << endl;
// NOTE: donot use cin>> anywhere in the code coz things will break
// use getline(cin, myPort); instead
// TODO: read/write download log and peer log
// Fire separate threads for peer server and client menu
thread serverThread(peerServer);
thread clientThread(clientMenu);
// Don't allow main thread to end until both client and server threads are done
// Joining a thread makes one thread of execution wait for another thread to finish running.
serverThread.join();
clientThread.join();
return 0;
}