private bool SendResultToJobServer(Job j, out bool errorInReadingOutputFile)
{
const int HEADER_FLAGS_FIELD_SIZE = 1; // 1 Byte
const int HEADER_PAYLOAD_SIZE_FIELD_SIZE = 4; // 4 Byte
const int HEADER_WORKER_ID_FIELD_SIZE = 2; // 2 Byte
const int HEADER_JOB_ID_FIELD_SIZE = 8; // 8 Byte
const int HEADER_PAYLOAD_START_INDEX = HEADER_FLAGS_FIELD_SIZE + HEADER_PAYLOAD_SIZE_FIELD_SIZE +
HEADER_WORKER_ID_FIELD_SIZE + HEADER_JOB_ID_FIELD_SIZE;
byte[] message = null;
long messageSize = 0;
bool jobOutputFileReadSuccessfully = true;
uint jobOutputFileLength = 0;
#region Read Job's output file
System.IO.FileStream fs = null;
ErrorInReadingJobOutputFile fileReadErrLog = null;
try {
// Open Job's result file for reading
fs = System.IO.File.OpenRead(j.OutputFileName);
// allocate memory for message
jobOutputFileLength = (uint)fs.Length;
messageSize = HEADER_FLAGS_FIELD_SIZE + HEADER_PAYLOAD_SIZE_FIELD_SIZE + HEADER_WORKER_ID_FIELD_SIZE +
HEADER_JOB_ID_FIELD_SIZE + jobOutputFileLength;
message = new byte[messageSize];
//
// Read file and close it
fs.Read(message, HEADER_PAYLOAD_START_INDEX, (int)jobOutputFileLength);
errorInReadingOutputFile = false;
}
catch (System.IO.FileNotFoundException fileNotFoundExcp) {
jobOutputFileReadSuccessfully = false;
fileReadErrLog = new WorkerAgent.ErrorInReadingJobOutputFile();
fileReadErrLog.Job = j;
fileReadErrLog.Message = "Job's output file not found.";
fileReadErrLog.ErrorMessage = fileNotFoundExcp.Message;
errorInReadingOutputFile = true;
EventExtensions.Raise(NewLogItem, new[] { fileReadErrLog });
}
catch (Exception e) {
jobOutputFileReadSuccessfully = false;
fileReadErrLog = new WorkerAgent.ErrorInReadingJobOutputFile();
fileReadErrLog.Job = j;
fileReadErrLog.Message = "Error in reading job's output file.";
fileReadErrLog.ErrorMessage = e.Message;
errorInReadingOutputFile = true;
EventExtensions.Raise(NewLogItem, new[] { fileReadErrLog });
}
finally {
if (fs != null)
{
fs.Close();
}
}
#endregion
if (!jobOutputFileReadSuccessfully)
{
return(false);
}
#region Send job result(message) to the job server
// Set Header's fields of the message
byte[] payloadSizeBytes = new byte[4]; // UInt32
byte[] workerIDBytes = new byte[2]; // UInt16
byte[] jobIDBytes = new byte[8]; // UInt64
// Flags
message[0] = 0; // This field is reserved for future use.
// Payload Size, UInt32
payloadSizeBytes = BitConverter.GetBytes(jobOutputFileLength);
for (int i = 0; i < 4; i++)
{
message[i + HEADER_FLAGS_FIELD_SIZE] = payloadSizeBytes[i];
}
// Worker ID, UInt16
workerIDBytes = BitConverter.GetBytes(ID);
for (int i = 0; i < 2; i++)
{
message[i + HEADER_FLAGS_FIELD_SIZE + HEADER_PAYLOAD_SIZE_FIELD_SIZE] = workerIDBytes[i];
}
// JobID, UInt64
jobIDBytes = BitConverter.GetBytes(j.ID);
for (int i = 0; i < 8; i++)
{
message[i + HEADER_FLAGS_FIELD_SIZE + HEADER_PAYLOAD_SIZE_FIELD_SIZE + HEADER_WORKER_ID_FIELD_SIZE] = jobIDBytes[i];
}
// Try "AttemptsToSendResult" times to send the message
bool successfullySent = false;
TcpClient client = new TcpClient();
NetworkStream netStream = null;
for (int i = 1; (i <= AttemptsToSendResult) && (!successfullySent); i++)
{
try {
client.Connect(new IPEndPoint(JobServerIPAddress, JobServerDataChannelPortNumber));
netStream = client.GetStream();
netStream.Write(message, 0, (int)messageSize);
successfullySent = true;
// Generate log
WorkerAgent.JobResultSentLog log = new JobResultSentLog();
log.Job = j;
log.Message = "Job's output file sent to the job server.";
EventExtensions.Raise(NewLogItem, new[] { log });
}
catch (Exception e) {
successfullySent = false;
WorkerAgent.ErrorInConnectingToJobServerLog log = new ErrorInConnectingToJobServerLog();
log.Message = "[ Attempt " + (i).ToString() + " ] Could not connect to the job server to transfer the results.";
log.ErrorMessage = e.Message;
EventExtensions.Raise(NewLogItem, new[] { log });
}
if ((!successfullySent) && (i < AttemptsToSendResult))
{
// if an error has occured in sending, Wait 1 second and then try to send again
System.Threading.Thread.Sleep(3000);
}
}
if (netStream != null)
{
netStream.Close();
}
client.Close();
#endregion
return(successfullySent);
}
// Methods
public bool RegisterWorker(UInt16 WorkerID, int DataChannelPortNumber, int ControlChannelPortNumber)
{
const int MESSAGE_SIZE = 7;
//const int REPLY_CODE_FAILURE = 0;
const int REPLY_CODE_SUCCESSFULLY_REGISTERED = 2;
const int REPLY_CODE_REGISTRATION_FAILED_DUPLICATE_ID_ = 3;
bool registered;
TcpClient client = new TcpClient();
NetworkStream netStream;
byte[] message = new byte[MESSAGE_SIZE];
byte[] reply = new byte[1];
#region set message fields
byte[] workerIDBytes, dataChannelPortNumberBytes, controlChannelPortNumberBytes;
// Code = 1
message[0] = 1;
// Worker ID
workerIDBytes = BitConverter.GetBytes(WorkerID);
message[1] = workerIDBytes[0];
message[2] = workerIDBytes[1];
// DataChannelPortNumber
dataChannelPortNumberBytes = BitConverter.GetBytes((UInt16)DataChannelPortNumber);
message[3] = dataChannelPortNumberBytes[0];
message[4] = dataChannelPortNumberBytes[1];
// ControlChannelPortNumberBytes
controlChannelPortNumberBytes = BitConverter.GetBytes((UInt16)ControlChannelPortNumber);
message[5] = controlChannelPortNumberBytes[0];
message[6] = controlChannelPortNumberBytes[1];
#endregion
// Generate WorkerRegisterationStartedLog log
WorkerRegisterationStartLog registerationStartedlog = new WorkerRegisterationStartLog();
registerationStartedlog.Message = "Registering worker...";
NewLogItem(registerationStartedlog);
// Connect to job server and send message
registered = false;
try {
client.Connect(JobServerControlUnit);
netStream = client.GetStream();
netStream.ReadTimeout = 3000; // Wait 3 seconds for reply from server
netStream.Write(message, 0, MESSAGE_SIZE);
netStream.Read(reply, 0, 1);
if (reply[0] == REPLY_CODE_SUCCESSFULLY_REGISTERED)
{
registered = true;
// Generate WorkerRegisterdLog log
WorkerRegisterdLog log = new WorkerRegisterdLog();
log.Message = "Worker registerd.";
NewLogItem(log);
}
else if (reply[0] == REPLY_CODE_REGISTRATION_FAILED_DUPLICATE_ID_)
{
// Generate WorkerRegisterationFailedLog log
WorkerRegisterationFailedLog log = new WorkerRegisterationFailedLog();
log.Message = "Registeration failed. a worker with ID=" + WorkerID.ToString() + " is currently registered. please change Worker ID.";
NewLogItem(log);
}
}
catch (Exception e) {
// Generate ErrorInConnectingToJobServerLog log
ErrorInConnectingToJobServerLog log = new ErrorInConnectingToJobServerLog();
log.ErrorMessage = e.Message;
log.Message = "Error in connecting to job server.";
NewLogItem(log);
}
finally {
client.Close();
}
return(registered);
}
