/// <summary>
/// Opens an existing file for reading.
/// </summary>
protected override BinaryReader OpenRead(ConnectedClient client, RelativePath path)
{
ScadaInstance instance = GetClientInstance(client);
string fileName;
if (IsServiceFolder(path) && path.AppFolder == AppFolder.Log)
{
fileName = instance.PathBuilder.GetAbsolutePath(path);
}
else if (IsConfigFolder(path) && path.Path.StartsWith(AgentConst.DownloadConfigPrefix))
{
fileName = Path.Combine(coreLogic.AppDirs.TempDir, path.Path);
if (!instance.PackConfig(fileName, path))
{
throw new ProtocolException(ErrorCode.InternalServerError);
}
}
else
{
throw new ProtocolException(ErrorCode.IllegalFunctionArguments, CommonPhrases.PathNotSupported);
}
Stream stream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
return(new BinaryReader(stream, Encoding.UTF8, false));
}
/// <summary>
/// Redirects the request from the Administrator client to an Agent client.
/// </summary>
private bool RedirectRequest(ConnectedClient adminClient, ScadaInstance instance, DataPacket dataPacket)
{
if (clientBundles.TryGetValue(instance.Name, out ClientBundle clientBundle) &&
clientBundle.AdminClient == adminClient &&
clientBundle.AgentClient is ConnectedClient agentClient)
{
try
{
lock (agentClient)
{
dataPacket.SessionID = agentClient.SessionID;
dataPacket.Encode();
agentClient.NetStream.Write(dataPacket.Buffer, 0, dataPacket.BufferLength);
agentClient.RegisterActivity();
}
return(true);
}
catch (Exception ex)
{
log.WriteError(Locale.IsRussian ?
"Ошибка при переадресации запроса на {0}: {1}" :
"Error redirecting request to {0}: {1}", agentClient.Address, ex.Message);
return(false);
}
finally
{
dataPacket.SessionID = adminClient.SessionID;
}
}
else
{
return(false);
}
}
/// <summary>
/// Gets the instance by name.
/// </summary>
public bool GetInstance(string name, out ScadaInstance scadaInstance)
{
if (instances == null)
{
scadaInstance = null;
return(false);
}
else
{
return(instances.TryGetValue(name, out scadaInstance));
}
}
/// <summary>
/// Получить экземпляр системы по наименованию
/// </summary>
public ScadaInstance GetScadaInstance(string name)
{
if (settings.Instances.TryGetValue(name, out ScadaInstanceSettings instanceSettings))
{
object syncRoot = locks.GetOrAdd(name, (key) => { return(new object()); });
ScadaInstance scadaInstance = new ScadaInstance(instanceSettings, syncRoot, log);
return(scadaInstance);
}
else
{
return(null);
}
}
/// <summary>
/// Gets the current status of the specified service.
/// </summary>
private void GetServiceStatus(ConnectedClient client, ScadaInstance instance, DataPacket request,
out ResponsePacket response)
{
ServiceApp serviceApp = (ServiceApp)client.InBuf[ArgumentIndex];
bool result = instance.GetServiceStatus(serviceApp, out ServiceStatus serviceStatus);
byte[] buffer = client.OutBuf;
response = new ResponsePacket(request, buffer);
int index = ArgumentIndex;
CopyBool(result, buffer, ref index);
CopyByte((byte)serviceStatus, buffer, ref index);
response.BufferLength = index;
}
/// <summary>
/// Sends the command to the service.
/// </summary>
private void ControlService(ConnectedClient client, ScadaInstance instance, DataPacket request,
out ResponsePacket response)
{
byte[] buffer = client.InBuf;
int index = ArgumentIndex;
ServiceApp serviceApp = (ServiceApp)GetByte(buffer, ref index);
ServiceCommand serviceCommand = (ServiceCommand)GetByte(buffer, ref index);
int timeout = GetInt32(buffer, ref index);
bool result = instance.ControlService(serviceApp, serviceCommand, timeout);
response = new ResponsePacket(request, client.OutBuf);
index = ArgumentIndex;
CopyBool(result, client.OutBuf, ref index);
response.BufferLength = index;
}
/// <summary>
/// Registers the newly connected client for the proxy instance.
/// </summary>
private void RegisterClient(ConnectedClient client, ScadaInstance instance)
{
if (instance.ProxyMode && clientBundles.TryGetValue(instance.Name, out ClientBundle clientBundle))
{
lock (clientBundle)
{
if (client.RoleID == AgentRoleID.Administrator)
{
clientBundle.AdminClient = client;
}
else if (client.RoleID == AgentRoleID.Agent)
{
clientBundle.AgentClient = client;
}
}
}
}
/// <summary>
/// Redirects the response from the Agent client to an Administrator client.
/// </summary>
private void RedirectResponse(ConnectedClient agentClient, ScadaInstance instance, DataPacket dataPacket)
{
if (clientBundles.TryGetValue(instance.Name, out ClientBundle clientBundle) &&
clientBundle.AgentClient == agentClient &&
clientBundle.AdminClient is ConnectedClient adminClient)
{
try
{
lock (adminClient)
{
dataPacket.SessionID = adminClient.SessionID;
dataPacket.Encode();
adminClient.NetStream.Write(dataPacket.Buffer, 0, dataPacket.BufferLength);
}
}
catch (Exception ex)
{
log.WriteError(Locale.IsRussian ?
"Ошибка при переадресации ответа на {0}: {1}" :
"Error redirecting response to {0}: {1}", agentClient.Address, ex.Message);
}
}
}
/// <summary>
/// Set authorized user data
/// </summary>
public void SetUser(string username, ScadaInstance scadaInstance)
{
LoggedOn = true;
Username = username;
ScadaInstance = scadaInstance;
}
/// <summary>
/// Gets the instance associated with the client.
/// </summary>
private bool GetClientInstance(ConnectedClient client, out ScadaInstance scadaInstance)
{
scadaInstance = GetClientTag(client).Instance;
return(scadaInstance != null);
}