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import java.net.Socket;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
class EntropybrokerConnector
{
String host;
int port = 55225;
final int maxBytes = 9999 / 8;
Socket socket;
InputStreamReader inputStream;
OutputStreamWriter outputStream;
EntropybrokerConnector(String host)
{
this.host = host;
}
EntropybrokerConnector(String host, int port)
{
this.host = host;
this.port = port;
}
void writeData(OutputStreamWriter outputStream, String what) throws Exception
{
int whatLength = what.length();
System.out.println("what: " + what);
for(int loop=0; loop<whatLength; loop++)
outputStream.write(what.charAt(loop));
outputStream.flush();
}
void writeData(OutputStreamWriter outputStream, byte [] what) throws Exception
{
int whatLength = what.length;
for(int loop=0; loop<whatLength; loop++)
outputStream.write(what[loop]);
outputStream.flush();
}
byte [] readData(InputStreamReader inputStream, int nBytes) throws Exception
{
byte [] output = new byte[nBytes];
for(int loop=0; loop<nBytes; loop++)
{
int curByte = inputStream.read();
if (curByte == -1)
throw new Exception("short read after " + loop + " of " + nBytes + " bytes");
output[loop] = (byte)curByte;
}
System.out.println("read: " + new String(output));
return output;
}
void sendClientType(OutputStreamWriter outputStream) throws Exception
{
String clientType = "EntropybrokerConnector (Java) v0.1";
String loginMessage = String.format("0006%04d", clientType.length()) + clientType;
writeData(outputStream, loginMessage);
}
private void connect() throws Exception
{
socket = new Socket(host, port);
inputStream = new InputStreamReader (socket.getInputStream());
outputStream = new OutputStreamWriter(socket.getOutputStream());
// tell what kind of client this is
sendClientType(outputStream);
}
byte [] getData(int bytes) throws Exception
{
if (bytes > maxBytes)
throw new Exception("EntropybrokerConnector::getData, maximum " + maxBytes + " supported");
if (socket == null || !socket.isConnected())
{
if (socket != null)
socket.close();
connect();
}
// request data
String requestData = String.format("0001%04d", bytes * 8);
writeData(outputStream, requestData);
// get request reply
byte [] reply = readData(inputStream, 8);
String replyString = new String(reply);
int nBits = Integer.valueOf(replyString.substring(4));
int nBytes = (nBits + 7) / 8;
if (replyString.substring(0, 3).equals("900") )
{
throw new Exception("Server is not refusing to send data");
}
return readData(inputStream, nBytes);
}
void putData(byte [] bytes) throws Exception
{
int whatLength = bytes.length;
if (socket == null || !socket.isConnected())
{
if (socket != null)
socket.close();
connect();
}
if (whatLength > maxBytes)
{
whatLength = maxBytes;
throw new Exception("EntropybrokerConnector::putData, maximum " + maxBytes + " supported");
}
// send send-request
String requestData = String.format("0002%04d", whatLength * 8);
writeData(outputStream, requestData);
// get send-request reply
byte [] reply = readData(inputStream, 8);
String replyString = new String(reply);
int nBits = Integer.valueOf(replyString.substring(4));
int nBytes = (nBits + 7) / 8;
if (replyString.substring(0, 4).equals("0001"))
{
writeData(outputStream, bytes);
}
else if (replyString.substring(0, 4).equals("9001"))
{
throw new Exception("Error code from server: all pools full, sleep " + replyString.substring(4) + " seconds");
}
}
}
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