public async Task ClientSend(NetworkStream networkStream, ServerClientMsg objectToClient)
{
var xmlSerializer = new XmlSerializer(objectToClient.GetType());
StringBuilder SerializedSb = new StringBuilder();
using (var stringWriter = new StringWriter())
{
xmlSerializer.Serialize(stringWriter, objectToClient);
SerializedSb.Append(stringWriter.ToString());
}
var serializedString = SerializedSb.ToString();
var MsgToSend = Encoding.UTF8.GetBytes(serializedString);
await networkStream.WriteAsync(MsgToSend, 0, MsgToSend.Length);
}
public async Task <ServerClientMsg> ClientReceive(NetworkStream networkStream)
{
var ReadBytes = new byte[8192];
ServerClientMsg ReceivedObject = new ServerClientMsg();
int BytesRead = await networkStream.ReadAsync(ReadBytes, 0, ReadBytes.Length);
if (BytesRead > 0)
{
ClientSb.Append(Encoding.UTF8.GetString(ReadBytes, 0, BytesRead));
var ReceivedMsg = ClientSb.ToString();
if (ReceivedMsg.IndexOf("</TcpMsg>") > -1)
{
XmlSerializer xmlS = new XmlSerializer(typeof(ServerClientMsg));
using (var stringReader = new StringReader(ReceivedMsg))
{
ReceivedObject = (ServerClientMsg)xmlS.Deserialize(stringReader);
}
ClientSb.Clear();
}
}
return(ReceivedObject);
}
private async Task OnTransferAsync(TcpClient tcpClient, StateObject tcpState)
{
await Task.Yield();
using (var networkStream = tcpClient.GetStream())
{
var buffer = new byte[8192];
// Receiving and deserialized the serializable object
var byteCount = await networkStream.ReadAsync(buffer, 0, buffer.Length);
if (byteCount > 0)
{
ServerSb.Append(Encoding.UTF8.GetString(buffer, 0, byteCount));
var StringMsg = ServerSb.ToString();
if (StringMsg.IndexOf("</TcpMsg>") > -1)
{
var xmlSerializer = new XmlSerializer(typeof(ServerClientMsg));
var ReceivedMsgObject = new ServerClientMsg();
using (var textReader = new StringReader(StringMsg))
{
ReceivedMsgObject = (ServerClientMsg)xmlSerializer.Deserialize(textReader);
}
// Clear string builder since we are done with it
ServerSb.Clear();
var MsgObjectToReturn = new ServerClientMsg();
// If this thread is for the server
if (tcpState.ClientType == false)
{
MsgObjectToReturn = ServerCreateRly(ReceivedMsgObject);
}
// If this thread if for the client
else
{
// Now that we have the serializable object, we need to switch through all the commands
switch (ReceivedMsgObject.Command)
{
// Data request command
case (int)ServerClientMsg.Commands.DataRq:
byte[] file;
string hash = string.Empty;
//Console.WriteLine("Client Server: received data request for file: {0} segment: {1}", ReceivedMsgObject.NameOfFile,ReceivedMsgObject.SegmentOfFile);
string filepath = tcpState.TempFolderPath + @"/" + Path.GetFileNameWithoutExtension(ReceivedMsgObject.NameOfFile);
filepath += "_temp" + ReceivedMsgObject.SegmentOfFile + Path.GetExtension(ReceivedMsgObject.NameOfFile);
//Console.WriteLine("Client Server: Retreiving file: {0}", filepath);
// See if the client's server actually has the file or not
if (File.Exists(filepath))
{
file = File.ReadAllBytes(filepath);
}
else
{
//Console.WriteLine("Client Server could not find the file {0}", filepath);
file = new byte[2];
}
// Retrieveing the hash to send back with the data segment
foreach (var pair in tcpState.FileDict)
{
if (pair.Key == ReceivedMsgObject.NameOfFile)
{
ObjectForFiledict obj = pair.Value;
hash = obj.Hash;
//Console.WriteLine("Client Server: Hash = {0}", hash);
break;
}
}
MsgObjectToReturn.DataRly(hash, ReceivedMsgObject.SegmentOfFile, file);
break;
default:
Console.WriteLine("Invalid command to the client server");
break;
}
}
// At this point, the serializable object should be popululated with the proper command and info
StringBuilder SerializedSb = new StringBuilder();
using (var stringWriter = new StringWriter())
{
xmlSerializer.Serialize(stringWriter, MsgObjectToReturn);
SerializedSb.Append(stringWriter.ToString());
}
var serializedString = SerializedSb.ToString();
var MsgToSend = Encoding.UTF8.GetBytes(serializedString);
// Sending the serializable response back
await networkStream.WriteAsync(MsgToSend, 0, MsgToSend.Length);
//Console.WriteLine("[Server] Response has been given");
}
}
}
}
public ServerClientMsg ServerCreateRly(ServerClientMsg ReceivedMsgObject)
{
var MsgObjectToReturn = new ServerClientMsg();
switch (ReceivedMsgObject.Command)
{
// If we received a Register Files message from the client
case (int)ServerClientMsg.Commands.RegisterRq:
List <bool> SuccessList = new List <bool>();
// Looping through all the messages and add it to the dictionary if possible
for (int i = 0; i < ReceivedMsgObject.Files.Count; i++)
{
if (!ServerDict.ContainsKey(ReceivedMsgObject.Files[i]))
{
ServerDataObject Sdo = new ServerDataObject();
// Store each success and failure in a list for a message back to the client
SuccessList.Add(Sdo.AddEndPoint(ReceivedMsgObject.ClientIP, ReceivedMsgObject.ClientPort));
Sdo.Length = ReceivedMsgObject.FilesLength[i];
ServerDict.Add(ReceivedMsgObject.Files[i], Sdo);
Console.WriteLine("Server: Added file: {0} to the server dict for client: {1} , {2}", ReceivedMsgObject.Files[i],
ReceivedMsgObject.ClientIP, ReceivedMsgObject.ClientPort);
}
else
{
bool successflag = true;
foreach (var pair in ServerDict)
{
if (pair.Key == ReceivedMsgObject.Files[i])
{
ServerDataObject ServObj = pair.Value;
for (int k = 0; k < ServObj.Addresses.Count; k++)
{
if (ServObj.Ports[k] == ReceivedMsgObject.ClientPort)
{
if (ServObj.Addresses[k] == ReceivedMsgObject.ClientIP)
{
Console.WriteLine("Server: Reject file {0} reg for client: {1} , {2}", ReceivedMsgObject.Files[i],
ReceivedMsgObject.ClientIP, ReceivedMsgObject.ClientPort);
successflag = false;
}
}
}
if (successflag == true)
{
Console.WriteLine("Server: Added client {0} , {1} to server dict",
ReceivedMsgObject.ClientIP, ReceivedMsgObject.ClientPort, ReceivedMsgObject.Files[i]);
ServObj.AddEndPoint(ReceivedMsgObject.ClientIP, ReceivedMsgObject.ClientPort);
}
break;
}
}
SuccessList.Add(successflag);
}
}
// Compile the return message for the client
MsgObjectToReturn.RegisterRly(SuccessList);
break;
// If we received a file list request from the client
case (int)ServerClientMsg.Commands.FileListRq:
// For a fileName list and a file size list
List <string> fileName = new List <string>();
List <long> fileSize = new List <long>();
foreach (var pair in ServerDict)
{
bool HasFileAlready = false;
ServerDataObject ServObj = pair.Value;
for (int k = 0; k < ServObj.Addresses.Count; k++)
{
if (ServObj.Ports[k] == ReceivedMsgObject.ClientPort)
{
if (ServObj.Addresses[k] == ReceivedMsgObject.ClientIP)
{
Console.WriteLine("Server: client {0} , {1} already has the file {2}", ReceivedMsgObject.ClientIP,
ReceivedMsgObject.ClientPort, pair.Key);
HasFileAlready = true;
break;
}
}
}
if (HasFileAlready == false)
{
fileName.Add(pair.Key);
ServerDataObject obj = pair.Value;
fileSize.Add(obj.Length);
}
}
MsgObjectToReturn.FileListRly(fileName, fileSize);
break;
// If we received a file location request from the client
case (int)ServerClientMsg.Commands.FileLocRq:
// For a fileName list and a file size list
List <string> addresses = new List <string>();
List <int> ports = new List <int>();
long length = 0;
foreach (var pair in ServerDict)
{
if (pair.Key == ReceivedMsgObject.NameOfFile)
{
ServerDataObject SObj = pair.Value;
addresses = SObj.Addresses;
ports = SObj.Ports;
length = SObj.Length;
}
}
MsgObjectToReturn.FileLocRly(length, addresses, ports);
break;
// On leave request, the server need to remove all files that has the client's ip address.
// if the client is the last address that is associated with that file, then the server needs to remove the file
case (int)ServerClientMsg.Commands.LeaveRq:
List <string> FilestoRemove = new List <string>();
foreach (var pair in ServerDict)
{
List <int> indexToRemove = new List <int>();
ServerDataObject objOfFile = pair.Value;
for (int i = 0; i < objOfFile.Addresses.Count; i++)
{
if (objOfFile.Addresses[i] == ReceivedMsgObject.ClientIP)
{
if (objOfFile.Ports[i] == ReceivedMsgObject.ClientPort)
{
indexToRemove.Add(i);
}
}
}
// This allows the removal process to be skipped if the client doesn't have this file
if (indexToRemove.Any())
{
foreach (var index in indexToRemove)
{
objOfFile.Addresses.RemoveAt(index);
objOfFile.Ports.RemoveAt(index);
}
if (!objOfFile.Addresses.Any())
{
FilestoRemove.Add(pair.Key);
}
}
}
// Now the server has to remove all the files that doesn't have any clients on it
if (FilestoRemove.Any())
{
foreach (var key in FilestoRemove)
{
ServerDict.Remove(key);
}
}
MsgObjectToReturn.LeaveRly();
break;
case (int)ServerClientMsg.Commands.DataRly:
Console.WriteLine("Requesting Data from server instead of client");
break;
default:
break;
}
return(MsgObjectToReturn);
}
private async Task ClientOnTransferAsync(TcpClient tcpclient, ClientPassableObject taskObject)
{
await Task.Yield();
using (var networkStream = tcpclient.GetStream())
{
var objectToClient = new ServerClientMsg();
// send the proper serializable message depending on the command that was given
switch (taskObject.command)
{
case (int)ClientPassableObject.enCommands.RegFiles:
objectToClient.RegisterRq(taskObject.address, taskObject.port, taskObject.FilesToReg, taskObject.FilesLength);
break;
case (int)ClientPassableObject.enCommands.PrintDownloadable:
objectToClient.FileListRq(taskObject.address, taskObject.port);
break;
case (int)ClientPassableObject.enCommands.Leave:
objectToClient.LeaveRq(taskObject.address, taskObject.port);
break;
case (int)ClientPassableObject.enCommands.FileLocation:
objectToClient.FileLocRq(taskObject.FileToDownload);
break;
case (int)ClientPassableObject.enCommands.GetFile:
objectToClient.DataRq(taskObject.FileToDownload, taskObject.FileSegmentToDownload);
break;
}
await ClientSend(networkStream, objectToClient);
// Start receiving reply from the server
ServerClientMsg ReceivedObject = await ClientReceive(networkStream);
switch (ReceivedObject.Command)
{
// If it is a Register file reply then tell the user which file was successful.
case (int)ServerClientMsg.Commands.RegisterRly:
Console.WriteLine("");
for (int i = 0; i < taskObject.FilesLength.Count; i++)
{
if (ReceivedObject.SuccessCount[i] == true)
{
Console.WriteLine("You have successfully registered file: {0}", Path.GetFileName(taskObject.FilesToReg[i]));
}
else
{
Console.WriteLine("You were not able to registered file: {0}", Path.GetFileName(taskObject.FilesToReg[i]));
}
}
taskObject.FilesRegSuccessCount = ReceivedObject.SuccessCount;
taskObject.DoneFlag = true;
break;
// if it is a file list request then we need to print it all on the screen
case (int)ServerClientMsg.Commands.FileListRly:
// if the server did not return anything
if (!ReceivedObject.Files.Any())
{
Console.WriteLine("\nNo files are avaialable for download at this point.");
taskObject.DoneFlag = true;
break;
}
// If there is files avaiable for download
Console.WriteLine("\nThere are {0} files available for download. \nThese are the downloadable files:\n", ReceivedObject.Files.Count);
for (int i = 0; i < ReceivedObject.Files.Count; i++)
{
var file = ReceivedObject.Files[i];
var length = ReceivedObject.FilesLength[i];
Console.WriteLine("{0}) {1} Size: {2} bytes", i + 1, file, length);
taskObject.DownloadableFiles.Add(file);
taskObject.DownloadableFilesLength.Add(length);
}
taskObject.DoneFlag = true;
break;
case (int)ServerClientMsg.Commands.FileLocRly:
taskObject.FileToDownloadLength = ReceivedObject.SizeOfFile;
taskObject.AddressAtFile2Download = ReceivedObject.IPAddresses;
taskObject.PortAtFile2Download = ReceivedObject.Ports;
taskObject.DoneFlag = true;
break;
case (int)ServerClientMsg.Commands.DataRly:
taskObject.ResultFileSegment = ReceivedObject.ResultingDataSegment;
taskObject.ResultFileHash = ReceivedObject.HashOfFile;
taskObject.ResultFileSegmentNo = ReceivedObject.SegmentOfFile;
taskObject.DoneFlag = true;
break;
// if it is leave replay then we don't need to do anything
case (int)ServerClientMsg.Commands.LeaveRly:
Console.WriteLine("\nThe program is ready for shutdown. Press any key to close the program");
taskObject.DoneFlag = true;
break;
}
}
}
private async Task OnTransferAsync(TcpClient tcpClient, StateObject tcpState)
{
await Task.Yield();
using (var networkStream = tcpClient.GetStream())
{
var buffer = new byte[8192];
var byteCount = await networkStream.ReadAsync(buffer, 0, buffer.Length);
if (byteCount > 0)
{
ServerSb.Append(Encoding.UTF8.GetString(buffer, 0, byteCount));
var StringMsg = ServerSb.ToString();
if (StringMsg.IndexOf("</TcpMsg>") > -1)
{
var xmlSerializer = new XmlSerializer(typeof(ServerClientMsg));
var ReceivedMsgObject = new ServerClientMsg();
using (var textReader = new StringReader(StringMsg))
{
ReceivedMsgObject = (ServerClientMsg)xmlSerializer.Deserialize(textReader);
}
// Clear string builder since we are done with it
ServerSb.Clear();
var MsgObjectToReturn = new ServerClientMsg();
// If this thread if for the server
if (tcpState.ClientType == false)
{
MsgObjectToReturn = ServerCreateRly(ReceivedMsgObject);
}
// If this thread if for the client
else
{
Console.WriteLine("client Server received {0} command", ReceivedMsgObject.Command);
switch (ReceivedMsgObject.Command)
{
case (int)ServerClientMsg.Commands.DataRq:
string file = string.Empty;
string hash = string.Empty;
Console.WriteLine("ClientServer received the data request");
foreach (var pair in tcpState.FileDict)
{
if (pair.Key == ReceivedMsgObject.NameOfFile)
{
ObjectForFiledict resultObj = pair.Value;
file = resultObj.Segments[ReceivedMsgObject.SegmentOfFile];
hash = resultObj.Hash;
if (!file.Any() || String.IsNullOrEmpty(hash))
{
Console.WriteLine("string or hash is empty");
}
}
}
Console.WriteLine("ClientServer is sending string: {0} \nWith a hash of: {1}", file, hash);
MsgObjectToReturn.DataRly(hash, ReceivedMsgObject.SegmentOfFile, file);
break;
default:
Console.WriteLine("Invalid command to the client server");
break;
}
}
StringBuilder SerializedSb = new StringBuilder();
using (var stringWriter = new StringWriter())
{
xmlSerializer.Serialize(stringWriter, MsgObjectToReturn);
SerializedSb.Append(stringWriter.ToString());
}
var serializedString = SerializedSb.ToString();
var MsgToSend = Encoding.UTF8.GetBytes(serializedString);
await networkStream.WriteAsync(MsgToSend, 0, MsgToSend.Length);
//Console.WriteLine("[Server] Response has been given");
}
}
}
}
private async Task OnTransferAsync(TcpClient tcpClient, StateObject tcpState)
{
await Task.Yield();
using (var networkStream = tcpClient.GetStream())
{
var buffer = new byte[8192];
var byteCount = await networkStream.ReadAsync(buffer, 0, buffer.Length);
if (byteCount > 0)
{
ServerSb.Append(Encoding.UTF8.GetString(buffer, 0, byteCount));
var StringMsg = ServerSb.ToString();
if (StringMsg.IndexOf("</TcpMsg>") > -1)
{
var xmlSerializer = new XmlSerializer(typeof(ServerClientMsg));
var ReceivedMsgObject = new ServerClientMsg();
using (var textReader = new StringReader(StringMsg))
{
ReceivedMsgObject = (ServerClientMsg)xmlSerializer.Deserialize(textReader);
}
// Clear string builder since we are done with it
ServerSb.Clear();
var MsgObjectToReturn = new ServerClientMsg();
// If this thread if for the server
if (tcpState.ClientType == false)
{
MsgObjectToReturn = ServerCreateRly(ReceivedMsgObject);
}
// If this thread if for the client
else
{
Console.WriteLine("client Server received {0} command", ReceivedMsgObject.Command);
switch (ReceivedMsgObject.Command)
{
case (int)ServerClientMsg.Commands.DataRq:
string file = string.Empty;
string hash = string.Empty;
Console.WriteLine("ClientServer received the data request");
foreach (var pair in tcpState.FileDict)
{
if (pair.Key == ReceivedMsgObject.NameOfFile)
{
ObjectForFiledict resultObj = pair.Value;
file = resultObj.Segments[ReceivedMsgObject.SegmentOfFile];
hash = resultObj.Hash;
if (!file.Any() || String.IsNullOrEmpty(hash))
{
Console.WriteLine("string or hash is empty");
}
}
}
Console.WriteLine("ClientServer is sending string: {0} \nWith a hash of: {1}", file, hash);
MsgObjectToReturn.DataRly(hash, ReceivedMsgObject.SegmentOfFile, file);
break;
default:
Console.WriteLine("Invalid command to the client server");
break;
}
}
StringBuilder SerializedSb = new StringBuilder();
using (var stringWriter = new StringWriter())
{
xmlSerializer.Serialize(stringWriter, MsgObjectToReturn);
SerializedSb.Append(stringWriter.ToString());
}
var serializedString = SerializedSb.ToString();
var MsgToSend = Encoding.UTF8.GetBytes(serializedString);
await networkStream.WriteAsync(MsgToSend, 0, MsgToSend.Length);
//Console.WriteLine("[Server] Response has been given");
}
}
}
}
public async Task ClientSend(NetworkStream networkStream ,ServerClientMsg objectToClient)
{
var xmlSerializer = new XmlSerializer(objectToClient.GetType());
StringBuilder SerializedSb = new StringBuilder();
using (var stringWriter = new StringWriter())
{
xmlSerializer.Serialize(stringWriter, objectToClient);
SerializedSb.Append(stringWriter.ToString());
}
var serializedString = SerializedSb.ToString();
var MsgToSend = Encoding.UTF8.GetBytes(serializedString);
await networkStream.WriteAsync(MsgToSend, 0, MsgToSend.Length);
}
public async Task<ServerClientMsg> ClientReceive(NetworkStream networkStream)
{
var ReadBytes = new byte[8192];
ServerClientMsg ReceivedObject = new ServerClientMsg();
int BytesRead = await networkStream.ReadAsync(ReadBytes, 0, ReadBytes.Length);
if (BytesRead > 0)
{
ClientSb.Append(Encoding.UTF8.GetString(ReadBytes, 0, BytesRead));
var ReceivedMsg = ClientSb.ToString();
if (ReceivedMsg.IndexOf("</TcpMsg>") > -1)
{
XmlSerializer xmlS = new XmlSerializer(typeof(ServerClientMsg));
using (var stringReader = new StringReader(ReceivedMsg))
{
ReceivedObject = (ServerClientMsg)xmlS.Deserialize(stringReader);
}
ClientSb.Clear();
}
}
return ReceivedObject;
}
private async Task ClientOnTransferAsync(TcpClient tcpclient, ClientPassableObject taskObject)
{
await Task.Yield();
using (var networkStream = tcpclient.GetStream())
{
//var SendBytes = Encoding.UTF8.GetBytes("Hello this is the Client");
//await networkStream.WriteAsync(SendBytes, 0, SendBytes.Length);
//var ReceivedBytes = new byte[1024];
//await networkStream.ReadAsync(ReceivedBytes, 0, ReceivedBytes.Length);
//Console.WriteLine(Encoding.UTF8.GetString(ReceivedBytes));
var objectToClient = new ServerClientMsg();
switch (taskObject.command)
{
case (int)ClientPassableObject.enCommands.RegFiles:
objectToClient.RegisterRq(taskObject.address, taskObject.port, taskObject.FilesToReg, taskObject.FilesLength);
break;
case (int)ClientPassableObject.enCommands.PrintDownloadable:
objectToClient.FileListRq();
break;
case (int)ClientPassableObject.enCommands.Leave:
objectToClient.LeaveRq(taskObject.address, taskObject.port);
break;
case (int)ClientPassableObject.enCommands.FileLocation:
objectToClient.FileLocRq(taskObject.FileToDownload);
break;
case (int)ClientPassableObject.enCommands.GetFile:
objectToClient.DataRq(taskObject.FileToDownload, taskObject.FileSegmentToDownload);
break;
}
await ClientSend(networkStream, objectToClient);
// Start receiving reply from the server
ServerClientMsg ReceivedObject = await ClientReceive(networkStream);
switch (ReceivedObject.Command)
{
// If it is a Register file reply then tell the user which file was successful.
case (int)ServerClientMsg.Commands.RegisterRly:
Console.WriteLine("");
for(int i = 0; i < taskObject.FilesLength.Count; i++)
{
if (ReceivedObject.SuccessCount[i] == true)
{
Console.WriteLine("You have successfully registered file: {0}", Path.GetFileName(taskObject.FilesToReg[i]));
}
else
{
Console.WriteLine("You were not able to registered file: {0}", Path.GetFileName(taskObject.FilesToReg[i]));
}
}
taskObject.FilesRegSuccessCount = ReceivedObject.SuccessCount;
taskObject.DoneFlag = true;
break;
// if it is a file list request then we need to print it all on the screen
case (int)ServerClientMsg.Commands.FileListRly:
// if the server did not return anything
if (!ReceivedObject.Files.Any())
{
Console.WriteLine("\nNo files are avaialable for download at this point.");
taskObject.DoneFlag = true;
break;
}
// If there is files avaiable for download
Console.WriteLine("\nThere are {0} files available for download. \nThese are the downloadable files:\n", ReceivedObject.Files.Count);
for (int i = 0; i < ReceivedObject.Files.Count; i++)
{
var file = ReceivedObject.Files[i];
var length = ReceivedObject.FilesLength[i];
Console.WriteLine("{0}) {1}", i + 1, file);
taskObject.DownloadableFiles.Add(file);
taskObject.DownloadableFilesLength.Add(length);
}
taskObject.DoneFlag = true;
break;
case (int)ServerClientMsg.Commands.FileLocRly:
taskObject.FileToDownloadLength = ReceivedObject.SizeOfFile;
taskObject.AddressAtFile2Download = ReceivedObject.IPAddresses;
taskObject.PortAtFile2Download = ReceivedObject.Ports;
taskObject.DoneFlag = true;
break;
case (int)ServerClientMsg.Commands.DataRly:
taskObject.ResultFileSegment = ReceivedObject.ResultingDataSegment;
taskObject.ResultFileHash = ReceivedObject.HashOfFile;
taskObject.ResultFileSegmentNo = ReceivedObject.SegmentOfFile;
taskObject.DoneFlag = true;
break;
// if it is leave replay then we don't need to do anything
case (int)ServerClientMsg.Commands.LeaveRly:
Console.WriteLine("\nThe program is ready for shutdown. Press any key to close the program");
taskObject.DoneFlag = true;
break;
}
}
}
public ServerClientMsg ServerCreateRly(ServerClientMsg ReceivedMsgObject)
{
var MsgObjectToReturn = new ServerClientMsg();
switch (ReceivedMsgObject.Command)
{
// If we received a Register Files message from the client
case (int)ServerClientMsg.Commands.RegisterRq:
List<bool> SuccessList = new List<bool>();
// Looping through all the messages and add it to the dictionary if possible
for (int i = 0; i < ReceivedMsgObject.Files.Count; i++)
{
if (!ServerDict.ContainsKey(ReceivedMsgObject.Files[i]))
{
ServerDataObject Sdo = new ServerDataObject();
// Store each success and failure in a list for a message back to the client
SuccessList.Add(Sdo.AddEndPoint(ReceivedMsgObject.ClientIP, ReceivedMsgObject.ClientPort));
Sdo.Length = ReceivedMsgObject.FilesLength[i];
ServerDict.Add(ReceivedMsgObject.Files[i], Sdo);
}
else
{
bool successflag = false;
foreach (var pair in ServerDict)
{
if (pair.Key == ReceivedMsgObject.Files[i])
{
ServerDataObject ServObj = pair.Value;
for (int k =0; k < ServObj.Addresses.Count; k++)
{
if (ServObj.Ports[k] == ReceivedMsgObject.ClientPort)
{
if (ServObj.Addresses[k] == ReceivedMsgObject.ClientIP)
successflag = false;
}
else
{
ServObj.AddEndPoint(ReceivedMsgObject.ClientIP, ReceivedMsgObject.ClientPort);
successflag = true;
}
}
}
}
SuccessList.Add(successflag);
}
}
// Compile the return message for the client
MsgObjectToReturn.RegisterRly(SuccessList);
break;
// If we received a file list request from the client
case (int)ServerClientMsg.Commands.FileListRq:
// For a fileName list and a file size list
List<string> fileName = new List<string>();
List<int> fileSize = new List<int>();
foreach (var pair in ServerDict)
{
fileName.Add(pair.Key);
ServerDataObject obj = pair.Value;
fileSize.Add(obj.Length);
}
MsgObjectToReturn.FileListRly(fileName, fileSize);
break;
// If we received a file location request from the client
case (int)ServerClientMsg.Commands.FileLocRq:
// For a fileName list and a file size list
List<string> addresses = new List<string>();
List<int> ports = new List<int>();
int length = 0;
foreach (var pair in ServerDict)
{
if (pair.Key == ReceivedMsgObject.NameOfFile)
{
ServerDataObject SObj = pair.Value;
addresses = SObj.Addresses;
ports = SObj.Ports;
length = SObj.Length;
}
}
MsgObjectToReturn.FileLocRly(length, addresses, ports);
break;
// On leave request, the server need to remove all files that has the client's ip address.
// if the client is the last address that is associated with that file, then the server needs to remove the file
case (int)ServerClientMsg.Commands.LeaveRq:
List<string> FilestoRemove = new List<string>();
foreach (var pair in ServerDict)
{
List<int> indexToRemove = new List<int>();
ServerDataObject objOfFile = pair.Value;
for (int i = 0; i < objOfFile.Addresses.Count; i++)
{
if (objOfFile.Addresses[i] == ReceivedMsgObject.ClientIP)
{
if (objOfFile.Ports[i] == ReceivedMsgObject.ClientPort)
indexToRemove.Add(i);
}
}
// This allows the removal process to be skipped if the client doesn't have this file
if (indexToRemove.Any())
{
foreach (var index in indexToRemove)
{
objOfFile.Addresses.RemoveAt(index);
objOfFile.Ports.RemoveAt(index);
}
if (!objOfFile.Addresses.Any())
{
FilestoRemove.Add(pair.Key);
}
}
}
// Now the server has to remove all the files that doesn't have any clients on it
if (FilestoRemove.Any())
{
foreach (var key in FilestoRemove)
{
ServerDict.Remove(key);
}
}
MsgObjectToReturn.LeaveRly();
break;
case (int)ServerClientMsg.Commands.DataRly:
Console.WriteLine("Requesting Data from server instead of client");
break;
default:
break;
}
return MsgObjectToReturn;
}
private async Task OnTransferAsync(TcpClient tcpClient, StateObject tcpState)
{
await Task.Yield();
using (var networkStream = tcpClient.GetStream())
{
var buffer = new byte[8192];
// Receiving and deserialized the serializable object
var byteCount = await networkStream.ReadAsync(buffer, 0, buffer.Length);
if (byteCount > 0)
{
ServerSb.Append(Encoding.UTF8.GetString(buffer, 0, byteCount));
var StringMsg = ServerSb.ToString();
if (StringMsg.IndexOf("</TcpMsg>") > -1)
{
var xmlSerializer = new XmlSerializer(typeof(ServerClientMsg));
var ReceivedMsgObject = new ServerClientMsg();
using (var textReader = new StringReader(StringMsg))
{
ReceivedMsgObject = (ServerClientMsg)xmlSerializer.Deserialize(textReader);
}
// Clear string builder since we are done with it
ServerSb.Clear();
var MsgObjectToReturn = new ServerClientMsg();
// If this thread is for the server
if (tcpState.ClientType == false)
{
MsgObjectToReturn = ServerCreateRly(ReceivedMsgObject);
}
// If this thread if for the client
else
{
// Now that we have the serializable object, we need to switch through all the commands
switch (ReceivedMsgObject.Command)
{
// Data request command
case (int)ServerClientMsg.Commands.DataRq:
byte[] file;
string hash = string.Empty;
//Console.WriteLine("Client Server: received data request for file: {0} segment: {1}", ReceivedMsgObject.NameOfFile,ReceivedMsgObject.SegmentOfFile);
string filepath = tcpState.TempFolderPath + @"/" + Path.GetFileNameWithoutExtension(ReceivedMsgObject.NameOfFile);
filepath += "_temp" + ReceivedMsgObject.SegmentOfFile + Path.GetExtension(ReceivedMsgObject.NameOfFile);
//Console.WriteLine("Client Server: Retreiving file: {0}", filepath);
// See if the client's server actually has the file or not
if (File.Exists(filepath))
{
file = File.ReadAllBytes(filepath);
}
else
{
//Console.WriteLine("Client Server could not find the file {0}", filepath);
file = new byte[2];
}
// Retrieveing the hash to send back with the data segment
foreach (var pair in tcpState.FileDict)
{
if(pair.Key == ReceivedMsgObject.NameOfFile)
{
ObjectForFiledict obj = pair.Value;
hash = obj.Hash;
//Console.WriteLine("Client Server: Hash = {0}", hash);
break;
}
}
MsgObjectToReturn.DataRly(hash, ReceivedMsgObject.SegmentOfFile, file);
break;
default:
Console.WriteLine("Invalid command to the client server");
break;
}
}
// At this point, the serializable object should be popululated with the proper command and info
StringBuilder SerializedSb = new StringBuilder();
using (var stringWriter = new StringWriter())
{
xmlSerializer.Serialize(stringWriter, MsgObjectToReturn);
SerializedSb.Append(stringWriter.ToString());
}
var serializedString = SerializedSb.ToString();
var MsgToSend = Encoding.UTF8.GetBytes(serializedString);
// Sending the serializable response back
await networkStream.WriteAsync(MsgToSend, 0, MsgToSend.Length);
//Console.WriteLine("[Server] Response has been given");
}
}
}
}
