public static ServiceStatus Deserialize(string file, ServiceConfig config)
{
Log.Trace("Trying to deserialize status XML file [{0}].", file);
ServiceStatus status;
var xs = new XmlSerializer(typeof(ServiceStatus));
try {
var reader = File.OpenText(file);
status = (ServiceStatus)xs.Deserialize(reader);
reader.Close();
Log.Trace("Finished deserializing service status XML file.");
}
catch (Exception) {
// if reading the status XML fails, we return an empty (new) one
status = new ServiceStatus();
Log.Warn("Deserializing [{0}] failed, creating new status using defaults.", file);
}
status._config = config;
ValidateStatus(status);
// now set the storage filename:
status._storageFile = file;
return(status);
}
/// <summary>
/// Validate the configuration, throwing exceptions on invalid parameters.
/// </summary>
private static void ValidateConfiguration(ServiceConfig c)
{
Log.Debug("Validating configuration...");
var errmsg = "";
string CheckEmpty(string value, string name)
{
// if the string is null terminate the validation immediately since this means the
// file doesn't contain a required parameter at all:
if (value == null)
{
var msg = $"mandatory parameter missing: <{name}>";
Log.Error(msg);
throw new ConfigurationErrorsException(msg);
}
if (string.IsNullOrWhiteSpace(value))
{
return($"mandatory parameter unset: <{name}>\n");
}
return(string.Empty);
}
string CheckMinValue(int value, string name, int min)
{
if (value == 0)
{
return($"<{name}> is unset (or set to 0), minimal accepted value is {min}\n");
}
if (value < min)
{
return($"<{name}> must not be smaller than {min}\n");
}
return(string.Empty);
}
string CheckLocalDrive(string value, string name)
{
var driveType = new DriveInfo(value).DriveType;
if (driveType != DriveType.Fixed)
{
return($"<{name}> ({value}) must be a local fixed drive, not '{driveType}'!\n");
}
return(string.Empty);
}
void WarnOnHighValue(int value, string name, int thresh)
{
if (value > thresh)
{
SubOptimal(value.ToString(), name, "value is set very high, please check!");
}
}
void SubOptimal(string value, string name, string message)
{
var msg = $">>> Sub-optimal setting detected: <{name}> [{value}] {message}";
ValidatorWarnings += msg + "\n";
Log.Warn(msg);
}
void LogAndThrow(string msg)
{
msg = $"Configuration issues detected:\n{msg}";
Log.Error(msg);
throw new ConfigurationErrorsException(msg);
}
// check if all required parameters are there and non-empty / non-zero:
errmsg += CheckEmpty(c.HostAlias, nameof(c.HostAlias));
errmsg += CheckEmpty(c.SourceDrive, nameof(c.SourceDrive));
errmsg += CheckEmpty(c.IncomingDirectory, nameof(c.IncomingDirectory));
errmsg += CheckEmpty(c.ManagedDirectory, nameof(c.ManagedDirectory));
errmsg += CheckEmpty(c.DestinationAlias, nameof(c.DestinationAlias));
errmsg += CheckEmpty(c.DestinationDirectory, nameof(c.DestinationDirectory));
errmsg += CheckEmpty(c.TmpTransferDir, nameof(c.TmpTransferDir));
errmsg += CheckMinValue(c.ServiceTimer, nameof(c.ServiceTimer), 1000);
errmsg += CheckMinValue(c.MaxCpuUsage, nameof(c.MaxCpuUsage), 5);
errmsg += CheckMinValue(c.MaxDiskQueue, nameof(c.MaxDiskQueue), 1);
errmsg += CheckMinValue(c.MinAvailableMemory, nameof(c.MinAvailableMemory), 256);
// if any of the required parameter checks failed we terminate now as many of the
// string checks below would fail on empty strings:
if (!string.IsNullOrWhiteSpace(errmsg))
{
LogAndThrow(errmsg);
}
////////// REQUIRED PARAMETERS SETTINGS VALIDATION //////////
// SourceDrive
if (c.SourceDrive.Substring(1) != @":\")
{
errmsg += "<SourceDrive> must be of form [X:\\]\n!";
}
errmsg += CheckLocalDrive(c.SourceDrive, nameof(c.SourceDrive));
// spooling directories: IncomingDirectory + ManagedDirectory
if (c.IncomingDirectory.StartsWith(@"\"))
{
errmsg += "<IncomingDirectory> must not start with a backslash!\n";
}
if (c.ManagedDirectory.StartsWith(@"\"))
{
errmsg += "<ManagedDirectory> must not start with a backslash!\n";
}
// DestinationDirectory
if (!Directory.Exists(c.DestinationDirectory))
{
errmsg += $"can't find (or reach) destination: {c.DestinationDirectory}\n";
}
// TmpTransferDir
var tmpTransferPath = Path.Combine(c.DestinationDirectory, c.TmpTransferDir);
if (!Directory.Exists(tmpTransferPath))
{
errmsg += $"can't find (or reach) temporary transfer dir: {tmpTransferPath}\n";
}
////////// OPTIONAL PARAMETERS SETTINGS VALIDATION //////////
// EmailFrom
if (!string.IsNullOrWhiteSpace(c.SmtpHost) &&
string.IsNullOrWhiteSpace(c.EmailFrom))
{
errmsg += "<EmailFrom> must not be empty if <SmtpHost> is configured!\n";
}
// DriveName
foreach (var driveToCheck in c.SpaceMonitoring)
{
errmsg += CheckLocalDrive(driveToCheck.DriveName, nameof(driveToCheck.DriveName));
}
////////// WEAK CHECKS ON PARAMETERS SETTINGS //////////
// those checks are non-critical and are simply reported to the logs
WarnOnHighValue(c.ServiceTimer, nameof(c.ServiceTimer), 10000);
WarnOnHighValue(c.MaxCpuUsage, nameof(c.MaxCpuUsage), 75);
WarnOnHighValue(c.MaxDiskQueue, nameof(c.MaxDiskQueue), 2000);
WarnOnHighValue(c.MinAvailableMemory, nameof(c.MinAvailableMemory), 8192);
WarnOnHighValue(c.AdminNotificationDelta, nameof(c.AdminNotificationDelta), 1440);
WarnOnHighValue(c.GraceNotificationDelta, nameof(c.GraceNotificationDelta), 10080);
WarnOnHighValue(c.StorageNotificationDelta, nameof(c.StorageNotificationDelta), 10080);
WarnOnHighValue(c.GracePeriod, nameof(c.GracePeriod), 100);
if (!c.DestinationDirectory.StartsWith(@"\\"))
{
SubOptimal(c.DestinationDirectory, "DestinationDirectory", "is not a UNC path!");
}
// LogLevel
var validLogLevels = new List <string> {
"Warn", "Info", "Debug", "Trace"
};
if (!validLogLevels.Contains(c.LogLevel))
{
SubOptimal(c.LogLevel, "LogLevel", "is invalid, using 'Debug'. Valid options: " +
string.Join(", ", validLogLevels));
c.LogLevel = "Debug";
}
if (string.IsNullOrWhiteSpace(errmsg))
{
return;
}
LogAndThrow(errmsg);
}
/// <summary>
/// Dummy method raising an exception (this class must not be serialized).
/// </summary>
public static void Serialize(string file, ServiceConfig c)
{
// the config is never meant to be written by us, therefore:
throw new SettingsPropertyIsReadOnlyException("The config file must not be written by the service!");
}