private static string GetSanitizedAppName(IProductConfiguration config)
{
string unsanitizedAppName = config.DDDataTags_Service;
if (string.IsNullOrWhiteSpace(unsanitizedAppName))
{
try
{
unsanitizedAppName = CurrentProcess.GetName();
}
catch
{
unsanitizedAppName = "UnknownApp";
}
}
// Sanitize app name:
var appName = new StringBuilder(unsanitizedAppName);
// Note that the 'appName' is likely to be based on the service name tag setting, which, in turn,
// is likely to be based on the ASP.NET site name.
// Common "unwished" characters that come up in site names, such as '/', '\\', ':' and others are
// contained in the invalid chars arrays below, especially in 'invalidFilenameChars'.
char[] invalidPathChars = Path.GetInvalidPathChars();
char[] invalidFilenameChars = Path.GetInvalidFileNameChars();
for (int p = 0; p < appName.Length; p++)
{
char c = appName[p];
bool isInvalid = char.IsWhiteSpace(c) || c == '.';
for (int i = 0; i < invalidPathChars.Length && !isInvalid; i++)
{
isInvalid = (c == invalidPathChars[i]);
}
for (int i = 0; i < invalidFilenameChars.Length && !isInvalid; i++)
{
isInvalid = (c == invalidFilenameChars[i]);
}
if (isInvalid)
{
appName[p] = '_';
}
}
return(appName.ToString());
}
/// <summary>
/// Figure out what the DDSevice tag should be, if the user specified nothing.
/// Try to get the same value as the Tracer does, so that the user gets the same value for the same app.
/// However, under some circumstances, the Tracer uses tracer specific data.
/// In such cases, we cannot have a completely identical name like for example:
/// - In some application servers, the Tracer considers whether the app makes GET or POST calls to downstream dependencies;
/// - Users may override the service tag programmatically on a per span basis.
/// - ...
/// Note that if the SIGNALFX_SERVICE environment variable is set, then the value returned by this method will probably
/// be overwritten anyway (<see cref="EnvironmentVariablesConfigurationProvider" />).
/// </summary>
public static string GetDdServiceFallback()
{
try
{
try
{
if (TryGetClassicAspNetSiteName(out var aspNetSiteName))
{
return(aspNetSiteName);
}
}
catch
{
// Just fall back to the next option.
// Also, note the doc comments on 'TryGetClassicAspNetSiteName(..)' about partial trust.
}
return(Assembly.GetEntryAssembly()?.GetName().Name.Trim() ?? CurrentProcess.GetName()?.Trim());
}
catch
{
return(null);
}
}
