private void CleanUp()
{
//foreach (List<SQLReaderCommand> commands in this.storedReaders.Values)
for (int j = 0; j < this.storedReaders.Count; j++)
{
KeyValuePair <WebSocket, List <SQLReaderCommand> > commands = this.storedReaders.ElementAt(j);
for (int i = 0; i < commands.Value.Count; i++)
{
SQLReaderCommand command = commands.Value[i];
if ((DateTime.Now - command.Timestamp) > SQLReaderCommand.COMMAND_TIMEOUT)
{
commands.Value.Remove(command);
i--;
}
}
if (commands.Value.Count == 0)
{
this.storedReaders.Remove(commands.Key);
j--;
}
}
}
private string ReadRows(SQLReaderCommand command)
{
StringBuilder stringBuilder = new StringBuilder();
StringWriter stringWriter = new StringWriter(stringBuilder);
using (JsonWriter jsonWriter = new JsonTextWriter(stringWriter))
{
jsonWriter.WriteStartArray();
if (command.MaxRows == null)
{
command.MaxRows = command.BufferedData.Count;
}
for (int i = command.TransferredRowCount; i < command.TransferredRowCount + command.MaxRows && i < command.BufferedData.Count; i++)
{
jsonWriter.WriteRaw(command.BufferedData[i]);
}
command.TransferredRowCount += command.MaxRows.Value;
jsonWriter.WriteEndArray();
return(stringWriter.ToString());
}
}
private void OnReceived(object sender, WebSocketReceivedEventArgs e)
{
try
{
// Syntax: see SQLReaderCommand or id:int for follow up reading
// e.g. see SQLReaderCommand as JSON serialized
// e.g. 42
// Library:
// SQLReader.ExecuteQuery(query, Dictonary<string, string> wildcards...) : JsonObject[maxRows]
// SQLReader.ExecuteStoredQuery(path, Dictonary<string, string> wildcards...) : JsonObject[maxRows]
// SQLReader.ExecuteQuery(query, int maxRows, Dictonary<string, string> wildcards...) : QueryReader
// SQLReader.ExecuteStoredQuery(path, int maxRows, Dictonary<string, string> wildcards...) : QueryReader
// myQueryReader.GetNextResults() : JsonObject[maxRows] oder null wenn nichts mehr verfügbar
int id;
if (int.TryParse(e.Message, out id))
{
// GetNextResults
// Continue reading already opened reader
SQLReaderCommand commandFound = null;
if (this.storedReaders.ContainsKey(e.WebSocket))
{
foreach (SQLReaderCommand command in this.storedReaders[e.WebSocket])
{
if (command.Id == id)
{
commandFound = command;
break;
}
}
}
if (commandFound != null)
{
Logging.Debug($"SQLReader continue reading request with id: {id} ({commandFound.TransferredRowCount} / {commandFound.BufferedData.Count})");
WebSocketHandler.SendTo(e.WebSocket, this.ReadRows(commandFound));
if (commandFound.TransferredRowCount >= commandFound.BufferedData.Count)
{
commandFound.TransferredRowCount = 0;
commandFound.BufferedData.Clear();
}
}
else
{
Logging.Error("SQLReader could not find id to continue reading: " + id);
}
}
else
{
SQLReaderCommand command;
try
{
using (StringReader stream = new StringReader(e.Message))
{
JsonSerializer serializer = new JsonSerializer();
command = (SQLReaderCommand)serializer.Deserialize(stream, typeof(SQLReaderCommand));
}
}
catch (Exception ex)
{
Logging.Error("SQLReader could not parse command: " + e.Message, ex);
return;
}
Logging.Debug("SQLReader request: " + command);
string query;
if (command.IsStoredQuery)
{
string absolutePath = Path.Combine(Program.Config.RootDirectory, SQLReader.STORED_QUERY_FOLDER, command.Query.Replace("/", "\\").TrimStart('\\'));
absolutePath = Uri.UnescapeDataString(absolutePath);
if (File.Exists(absolutePath) == false)
{
Logging.Error($"Query-File not found: {command.Query}");
return;
}
query = File.ReadAllText(absolutePath);
}
else
{
query = command.Query;
}
if (command.Wildcards != null)
{
foreach (KeyValuePair <string, string> wildcard in command.Wildcards)
{
query = query.Replace(wildcard.Key, wildcard.Value);
}
}
Database.Instance.ExecuteReader(query, (DatabaseReaderCallback data) =>
{
StringBuilder stringBuilder = new StringBuilder();
StringWriter stringWriter = new StringWriter(stringBuilder);
using (JsonWriter jsonWriter = new JsonTextWriter(stringWriter))
{
jsonWriter.WriteStartObject();
int fields = data.Records.FieldCount;
for (int i = 0; i < fields; i++)
{
jsonWriter.WritePropertyName(data.Records.GetName(i));
jsonWriter.WriteValue(data.Records[i]);
}
jsonWriter.WriteEndObject();
command.BufferedData.Add(stringWriter.ToString());
}
});
if (command.MaxRows == null)
{
WebSocketHandler.SendTo(e.WebSocket, command.Id + ":" + this.ReadRows(command));
}
else
{
if (this.storedReaders.ContainsKey(e.WebSocket) == false)
{
this.storedReaders.Add(e.WebSocket, new List <SQLReaderCommand>());
}
foreach (SQLReaderCommand otherCommand in this.storedReaders[e.WebSocket])
{
if (otherCommand.Id == command.Id)
{
this.storedReaders[e.WebSocket].Remove(otherCommand);
break;
}
}
this.storedReaders[e.WebSocket].Add(command);
}
}
this.CleanUp();
}
catch (Exception ex)
{
Logging.Error($"Error during receiving SQLReader request: {e.Message}", ex);
}
}
