/// <summary>
/// Add a log entry for when the model is updated.
/// </summary>
/// <param name="first">The old sequence number.</param>
/// <param name="second">The new sequence number.</param>
/// <param name="data">The model diff data.</param>
private void LogModelDiff(int first, int second, String data)
{
// Log the model update to file so that we can calculate performance metrics later.
// NOTE: Log format is: <SERVER_TIME>, <CLIENT>, <TYPE>, <START_SEQ>, <END_SEQ>, <DATA>
StringBuilder logEntry = new StringBuilder();
logEntry.Append(WebService.ToUnixTime(System.DateTime.Now).ToString());
logEntry.Append(",");
logEntry.Append(0);
logEntry.Append(",");
logEntry.Append("'MODEL_DIFF'");
logEntry.Append(",");
logEntry.Append(first);
logEntry.Append(",");
logEntry.Append(second);
logEntry.Append(",");
logEntry.Append("'");
logEntry.Append(data);
logEntry.Append("'");
if (sw != null)
{
lock (sw) {
sw.WriteLine(logEntry.ToString());
}
}
}
/// <summary>
/// Add a log entry for when we send a pong back to a client.
/// </summary>
/// <param name="client">The id of the client.</param>
/// <param name="data">The response data.</param>
private void LogPong(int client, String data)
{
// Log the model update to file so that we can calculate performance metrics later.
// NOTE: Log format is: <SERVER_TIME>, <CLIENT>, <TYPE>, <START_SEQ>, <END_SEQ>, <DATA>
StringBuilder logEntry = new StringBuilder();
logEntry.Append(WebService.ToUnixTime(System.DateTime.Now).ToString());
logEntry.Append(",");
logEntry.Append(client);
logEntry.Append(",");
logEntry.Append("'PONG'");
logEntry.Append(",");
logEntry.Append(-1);
logEntry.Append(",");
logEntry.Append(-1);
logEntry.Append(",");
logEntry.Append("'");
logEntry.Append(data);
logEntry.Append("'");
if (sw != null)
{
lock (sw) {
sw.WriteLine(logEntry.ToString());
}
}
}
/// <summary>
/// Add a log entry for when we receive a submission from clients.
/// </summary>
/// <param name="client">The id of the client.</param>
/// <param name="deck">The deck index.</param>
/// <param name="slide">The slide index.</param>
private void LogSubmissionReceived(int client, int deck, int slide)
{
// NOTE: Log format is: <SERVER_TIME>, <CLIENT>, <DECK_INDEX>, <SLIDE_INDEX>
StringBuilder logEntry = new StringBuilder();
logEntry.Append(WebService.ToUnixTime(System.DateTime.Now).ToString());
logEntry.Append(",");
logEntry.Append(client);
logEntry.Append(",");
logEntry.Append("'SUBMISSION'");
logEntry.Append(",");
logEntry.Append(deck);
logEntry.Append(",");
logEntry.Append(slide);
if (sw != null)
{
lock (sw) {
sw.WriteLine(logEntry.ToString());
}
}
}
/// <summary>
/// Handle data posted to up by th web client.
/// </summary>
/// <param name="parameters">The query string parameters.</param>
/// <param name="postData">The post data string.</param>
/// <returns>The response text.</returns>
private string PostHandler(NameValueCollection parameters, string postData)
{
// Get the parts of the post data.
string[] items = postData.Split(new char[] { '|' });
if (items[0] == STUDENT_SUBMISSION_REQUEST) // Handle student submission.
// Deserialize the Array of SimpleStrokeModel from the post data.
{
int clientId = Convert.ToInt32(items[1]);
int deck = Convert.ToInt32(items[2]);
int slide = Convert.ToInt32(items[3]);
object strokes = JSON.Decode(items[4]);
if (strokes is List <object> )
{
ArrayList deserializedStrokes = new ArrayList();
List <object> strokesArray = (List <object>)strokes;
foreach (object stroke in strokesArray)
{
if (stroke is List <KeyValuePair <string, object> > )
{
SimpleWebInk deserializedStroke = new SimpleWebInk();
List <KeyValuePair <string, object> > strokeObject = (List <KeyValuePair <string, object> >)stroke;
foreach (KeyValuePair <string, object> field in strokeObject)
{
switch (field.Key)
{
case "c": // Color
if (field.Value is List <KeyValuePair <string, object> > )
{
List <KeyValuePair <string, object> > color = (List <KeyValuePair <string, object> >)field.Value;
foreach (KeyValuePair <string, object> channel in color)
{
if (channel.Key == "r")
{
deserializedStroke.R = (byte)Math.Round((double)channel.Value);
}
else if (channel.Key == "g")
{
deserializedStroke.G = (byte)Math.Round((double)channel.Value);
}
else if (channel.Key == "b")
{
deserializedStroke.B = (byte)Math.Round((double)channel.Value);
}
}
}
break;
case "w": // Width
if (field.Value is double)
{
deserializedStroke.Width = (float)((double)field.Value);
}
break;
case "o": // Opacity
if (field.Value is double)
{
deserializedStroke.Opacity = (byte)Math.Round((double)field.Value);
}
break;
case "k": // Points
if (field.Value is List <object> )
{
List <object> points = (List <object>)field.Value;
int numPoints = points.Count / 2;
System.Drawing.Point[] pts = new System.Drawing.Point[numPoints];
for (int i = 0; i < numPoints; i++)
{
pts[i].X = (int)((double)points[(i * 2)] * 26.37f);
pts[i].Y = (int)((double)points[(i * 2) + 1] * 26.37f);
}
deserializedStroke.Pts = pts;
}
break;
}
}
deserializedStrokes.Add(deserializedStroke);
}
}
// Notify listeners that a student submission was received.
WebService.Instance.SubmissionReceived(WebServer.Instance, deck, slide, deserializedStrokes);
}
// Log that we responded to a pong.
this.LogSubmissionReceived(clientId, deck, slide);
}
else if (items[0] == QUICK_POLL_REQUEST) // Handle quick poll.
// Notify listeners that a quick poll update was received.
{
WebService.Instance.QuickPollReceived(WebServer.Instance,
new Guid(items[1]), items[2]);
}
else if (items[0] == PING_REQUEST) // Handle ping request.
{
String clientId = items[1];
String clientTimestamp = items[2];
String serverTimestamp = WebService.ToUnixTime(System.DateTime.Now).ToString();
// We should respond with the current timestamp.
String pong = "{\"u\":" + clientId +
",\"c\":" + clientTimestamp +
",\"s\":" + serverTimestamp + "}";
// Log that we responded to a pong.
this.LogPong(Convert.ToInt32(clientId), pong);
return(pong);
}
else if (items[0] == LOG_DUMP_REQUEST) // Handle a client log dump.
{
String clientId = items[1];
String logDump = items[2];
// Print the dumped log to a file.
StreamWriter logFile = new StreamWriter(
System.IO.Path.Combine(System.IO.Path.GetTempPath(),
"CP_ClientPerformanceLog_" + clientId.ToString() + ".txt"));
logFile.Write(logDump);
logFile.Close();
}
// By default, return an empty json object.
return("{}");
}