/// <summary>
/// Send to all the connected user the profile image of local user
/// </summary>
public async Task SendProfilePicture()
{
// Get the current list of online users
List <Host> currentHosts = _referenceData.GetOnlineUsers();
string currentImagePath = _referenceData.GetInfoLocalUser().ProfileImagePath;
if (!Utility.PathToFileName(currentImagePath).Equals(_referenceData.defaultImage))
{
IPAddress serverAddr;
foreach (Host host in currentHosts)
{
serverAddr = IPAddress.Parse(host.Ip);
int attempts = 0;
// In case of exception resend the packet three times
do
{
TcpClient client = null;
NetworkStream stream = null;
try {
attempts++;
client = new TcpClient();
await client.ConnectAsync(serverAddr.ToString(), SharedInfo.TCPPort).ConfigureAwait(false);
// It sends also the Hash of the current image
byte[] bytes = new byte[1 + 256 + 8 + 32];
// 1^ byte: packet type
bytes[0] = (byte)PacketType.CIMAGE;
// Following 256 bytes : file name
UTF8Encoding encorder = new UTF8Encoding();
encorder.GetBytes(Utility.PathToFileName(currentImagePath)).CopyTo(bytes, 1);
// Save the hash of the file
byte[] hash;
using (SHA256 sha = SHA256.Create()) {
FileStream file = File.OpenRead(currentImagePath);
hash = sha.ComputeHash(file);
file.Close();
}
// Open file image
using (var file = new FileStream(currentImagePath, FileMode.Open, FileAccess.Read, FileShare.Read, bufferSize * 1024, FileOptions.Asynchronous | FileOptions.SequentialScan)) {
// Following 8 bytes : file legth
BitConverter.GetBytes(file.Length).CopyTo(bytes, 257);
// Following 32 bytes : hash of the image
hash.CopyTo(bytes, 265);
// Get Network stream
stream = client.GetStream();
// First 297 : header
await stream.WriteAsync(bytes, 0, 297).ConfigureAwait(false);
// Following 64K of payload (profile image)
bytes = new byte[bufferSize * 64];
await file.CopyToAsync(stream, bufferSize).ConfigureAwait(false);
}
break;
}
catch (SocketException e) {
Console.WriteLine($"{DateTime.Now.ToString()}\t - SocketException on SendProfilePicture - {e.Message}");
// If the remote host was offline, try to resend it for three times
string UserStatus = _referenceData.GetUserStatus(host.Ip);
if (!UserStatus.Equals("") && UserStatus.Equals("offline"))
{
break;
}
else if (attempts == 3)
{
break;
}
else
{
await Task.Delay(10).ConfigureAwait(false);
}
}
catch (Exception e) {
Console.WriteLine($"{DateTime.Now.ToString()}\t - Exception on SendProfilePicture - {e.Message}");
if (attempts == 3)
{
break;
}
else
{
await Task.Delay(10).ConfigureAwait(false);
}
}
finally {
client.Close();
stream.Close();
}
} while (true);
}
}
}
