// parse the message and extract the name of the exception and the message
private static IOException GetExceptionFromResponse(HttpURLConnection con)
{
IOException e = null;
string resp;
if (con == null)
{
return(null);
}
try
{
resp = con.GetResponseMessage();
}
catch (IOException)
{
return(null);
}
if (resp == null || resp.IsEmpty())
{
return(null);
}
string exceptionClass = string.Empty;
string exceptionMsg = string.Empty;
string[] rs = resp.Split(";");
if (rs.Length < 2)
{
return(null);
}
exceptionClass = rs[0];
exceptionMsg = rs[1];
Log.Info("Error response from HTTP request=" + resp + ";ec=" + exceptionClass + ";em="
+ exceptionMsg);
if (exceptionClass == null || exceptionClass.IsEmpty())
{
return(null);
}
// recreate exception objects
try
{
Type ec = Sharpen.Runtime.GetType(exceptionClass).AsSubclass <Exception>();
// we are interested in constructor with String arguments
Constructor <Exception> constructor = ec.GetConstructor(new Type[] { typeof(string
) });
// create an instance
e = (IOException)constructor.NewInstance(exceptionMsg);
}
catch (Exception ee)
{
Log.Warn("failed to create object of this class", ee);
}
if (e == null)
{
return(null);
}
e.SetStackTrace(new StackTraceElement[0]);
// local stack is not relevant
Log.Info("Exception from HTTP response=" + e.GetLocalizedMessage());
return(e);
}
/// <exception cref="System.IO.IOException"/>
/// <exception cref="Org.Apache.Hadoop.Security.Authentication.Client.AuthenticationException
/// "/>
private static HttpURLConnection Run(URLConnectionFactory factory, Uri url)
{
HttpURLConnection conn = null;
try
{
conn = (HttpURLConnection)factory.OpenConnection(url, true);
if (conn.GetResponseCode() != HttpURLConnection.HttpOk)
{
string msg = conn.GetResponseMessage();
throw new IOException("Error when dealing remote token: " + msg);
}
}
catch (IOException ie)
{
Log.Info("Error when dealing remote token:", ie);
IOException e = GetExceptionFromResponse(conn);
if (e != null)
{
Log.Info("rethrowing exception from HTTP request: " + e.GetLocalizedMessage());
throw e;
}
throw;
}
return(conn);
}
/// <summary>Renew a Delegation Token.</summary>
/// <param name="nnAddr">the NameNode's address</param>
/// <param name="tok">the token to renew</param>
/// <returns>the Date that the token will expire next.</returns>
/// <exception cref="System.IO.IOException"/>
/// <exception cref="Org.Apache.Hadoop.Security.Authentication.Client.AuthenticationException
/// "/>
public static long RenewDelegationToken(URLConnectionFactory factory, URI nnAddr,
Org.Apache.Hadoop.Security.Token.Token <DelegationTokenIdentifier> tok)
{
StringBuilder buf = new StringBuilder(nnAddr.ToString()).Append(RenewDelegationTokenServlet
.PathSpec).Append("?").Append(RenewDelegationTokenServlet.Token).Append("=").Append
(tok.EncodeToUrlString());
HttpURLConnection connection = null;
BufferedReader @in = null;
try
{
connection = Run(factory, new Uri(buf.ToString()));
@in = new BufferedReader(new InputStreamReader(connection.GetInputStream(), Charsets
.Utf8));
long result = long.Parse(@in.ReadLine());
return(result);
}
catch (IOException ie)
{
Log.Info("error in renew over HTTP", ie);
IOException e = GetExceptionFromResponse(connection);
if (e != null)
{
Log.Info("rethrowing exception from HTTP request: " + e.GetLocalizedMessage());
throw e;
}
throw;
}
finally
{
IOUtils.Cleanup(Log, @in);
if (connection != null)
{
connection.Disconnect();
}
}
}