/// <summary>
/// Creates a TCP timeserver that listens for incoming connections and then responds with the current levels
/// </summary>
/// <returns>
/// void
/// </returns>
public static void TcpUnitServer()
{
bool done = false;
// Listen for connections on our defined port
var listener = new TcpListener(IPAddress.Any, portNum);
// Echo we're beginning the listener
Console.WriteLine("Unit server now listening for TCP requests on port " + portNum);
listener.Start();
while (!done)
{
TcpClient client = listener.AcceptTcpClient(); // accept the connection
NetworkStream ns = client.GetStream(); // establish a network stream
byte[] byte_levels = Encoding.ASCII.GetBytes(RetrieveData.ReadLevels()); // Retrieve and convert
// try to send our data
try
{
ns.Write(byte_levels, 0, byte_levels.Length);
ns.Close();
client.Close();
// Show how many bytes we sent on each connection
Console.WriteLine("Connection Established... Sent " + byte_levels.Length.ToString() + " Bytes");
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
}
public static void TcpTownClient()
{
// Placeholders
String received = "";
// Fetch ips in a list
Console.WriteLine("Fetching IPs");
SQLHelper getips = new SQLHelper("SELECT ip FROM units");
getips.Run_Cmd();
getips.SetIPs();
// Make a new list for the ips and ids
List <string> iplist = getips.Get_List();
//List<string> idlist = getids.Get_List();
// Make a string for errors
String errors = "";
Console.WriteLine("Beginning Requests...");
// Now go through down each ip and id in the lists and request the data
foreach (var ipaddress in iplist)
{
// Grab the associated unit address from the database
SQLHelper getid = new SQLHelper("SELECT unit_id FROM units WHERE ip='" + ipaddress + "' LIMIT 1");
//getid.Run_Reader();
string unit_id = getid.RunAndReturnOne();
// if the id is not our city identifier, proceed with asking for levels
if (!unit_id.ToString().Contains(cityID))
{
// Check if we're the unit before we try opening a network string
string checkipcmd = "hostname -I";
var result = checkipcmd.ExecBash();
result = result.TrimEnd('\r', '\n');
result = result.TrimEnd();
// if we aren't the unit, proceed
if (ipaddress.ToString() != result)
{
// Create a new TCP Client with the address and default port number
var client = new TcpClient(ipaddress, portNum);
// Establish a network Stream
NetworkStream ns = client.GetStream();
// Setup a byte array
byte[] bytes = new byte[1024];
// Read the bytes from the network stream into the array
int bytesRead = ns.Read(bytes, 0, bytes.Length);
// Format to string
received = Encoding.ASCII.GetString(bytes, 0, bytesRead);
}
// if we ARE the unit, read the files locally
else
{
received = RetrieveData.ReadLevels();
}
// Turn the input levels to an array
string[] levels = received.Split(',');
// Turn each level into a double
double wat = Convert.ToDouble(levels[0]);
double sew = Convert.ToDouble(levels[1]);
double pow = Convert.ToDouble(levels[2]);
// Generate a timestamp
Int32 unixTimestamp = (Int32)(DateTime.UtcNow.Subtract(new DateTime(1970, 1, 1))).TotalSeconds;
// Insert values with associated unit id into Database
SQLHelper insertcmd = new SQLHelper("INSERT INTO status VALUES(" + unixTimestamp + "," + "'" + unit_id + "'," + wat + "," + sew + "," + pow + ")");
insertcmd.Run_Cmd();
// Check for errors
errors = RetrieveData.EvaluateLevels(unixTimestamp, unit_id, wat, sew, pow);
// If we have errors, pause briefly and then send them!
if (!String.IsNullOrEmpty(errors))
{
Console.WriteLine("Errors detected, sending to city control...");
System.Threading.Thread.Sleep(5000);
try
{
SendError(errors);
}
catch (Exception e)
{
Console.WriteLine("Error reporting failed! Please ensure city control is powered on and running");
}
}
// Report levels to the console output
Console.WriteLine("Unit " + unit_id + " reports " + wat + " water, " + sew + " sewage, " + pow + " power");
}
// if we are dealing with a city, we need to send the acknowledgement message - sp spin up a server
else
{
// echo we're ignoring
Console.WriteLine("Skipping " + unit_id);
}
}
}