utils.h

/**
 * \file utils.h
 * This file contains the declarations of some helper methods for ApMon.
 */

/*
 * ApMon - Application Monitoring Tool
 *
 * Copyright (C) 2006 California Institute of Technology
 *
 * Permission is hereby granted, free of charge, to use, copy and modify 
 * this software and its documentation (the "Software") for any
 * purpose, provided that existing copyright notices are retained in 
 * all copies and that this notice is included verbatim in any distributions
 * or substantial portions of the Software. 
 * This software is a part of the MonALISA framework (http://monalisa.cacr.caltech.edu).
 * Users of the Software are asked to feed back problems, benefits,
 * and/or suggestions about the software to the MonALISA Development Team
 * (developers@monalisa.cern.ch). Support for this software - fixing of bugs,
 * incorporation of new features - is done on a best effort basis. All bug
 * fixes and enhancements will be made available under the same terms and
 * conditions as the original software,

 * IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY PARTY FOR
 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
 * OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION, OR ANY DERIVATIVES THEREOF,
 * EVEN IF THE AUTHORS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 * THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT. THIS SOFTWARE IS
 * PROVIDED ON AN "AS IS" BASIS, AND THE AUTHORS AND DISTRIBUTORS HAVE NO
 * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR
 * MODIFICATIONS.
 */

#ifdef _WIN32
  // FIXME: (MCl) the following warning tells that the usage of throw
  // declaration may cause trouble with VC > 7.1

  // Disable warning C4290: C++ exception specification ignored except to indicate a function is not __declspec(nothrow)
#pragma warning ( disable : 4290 )
#endif

#ifndef apmon_utils_h
#define apmon_utils_h

#include <stdexcept>
#include <ctype.h>

#define FATAL 0 /**< Logging level with minimum number of messages. */
#define WARNING 1 /**< Intermediate logging level. */
#define INFO 2 /**< Intermediate logging level. */
#define FINE 3 /**< Logging level with detailed information. */
#define DEBUG 4 /**< Logging level for debugging. */

using namespace std;

namespace apmon_utils {
  /**
   * Returns true if the page with the specified URL was modified since the
   * last check.
   * @param url The address of the page.
   * @param lastModified The "Last-Modified" header that was received last time
   * the page was requested.
   */
  bool urlModified(char *url, char *lastModified);

 /**
  * Performs a HTTP request and puts the result into a temporary file.
  * @param url The address of the web page.
  * @param reqType The type of the request (GET, POST, HEAD).
  * @param temp_filename The name of the temporary file.
  * @return The size of the response received from the server, in bytes.
  */
  int httpRequest(char *url, const char *reqType, char *temp_filename);

 /**
  * If "address" is a hostname, it returns the corresponding IP address;
  * if "address" is an IP address, it just returns a copy of the address.
  */
  char *findIP(char *address);


 /**
  * Parses an URL and determines the hostname, the port and the file name.
  * It is used for the URLs given in the configuration file.
  * @param url The URL string.
  * @param hostname The determined hostname (this is an output parameter).
  * @param port The determined port (also an output parameter).
  * @param identifier The determined file name (also an output parameter).
  */
  void parse_URL(char *url, char *hostname, int *port, char *identifier);

 /**
  * Frees the memory for a 2-dimensional character array.
  * @param mat The array to be freed.
  * @param nRows The number of rows in the arrray.
  */
  void freeMat(char **mat, int nRows);

  /**
   * Removes the leading and trailing white spaces from a string and puts the
   * result into a malloc'ed string.
   * @param s The input string (which is not modified).
   * @return The trimmed string.
   */
  char *trimString(char *s);

 /**
  * Determines the size of the XDR representation for a data item.
  * @param type The type of the data item (see the constants XDR_STRING, 
  * XDR_INT32, ... defined above).
  * @param value The value of the data item (only used when dealing with 
  * strings).
  */
  int xdrSize(int type, char *value);

 /**
  * Determines the size of a data item.
  * @param type The type of the data item (see the constants XDR_STRING, 
  * XDR_INT32, ... defined above).
  * @param value The value of the data item (only used when dealing with 
  * strings).
  */
  int sizeEval(int type, char *value);

  /**
   * Logs the parameters included in a datagram.
   */
  void logParameters(int level, int nParams, char **paramNames, 
		     int *valueTypes, char **paramValues);

  /**
   * Verifies whether an IP address is private.
   */
  bool isPrivateAddress(char *addr); 

  /**
   * Finds the index of a string in a string array.
   * @param item The string that is searched in the array.
   * @param vect The string array.
   * @param vectDim The number of strings in the array.
   * @return The index of the string or -1 if the string is not found.
   */
  int getVectIndex(const char *item, char **vect, int vectDim);

  /** If the newLevel parameter is not specified, log the message given as 
   * argument if the current logging level is greater than or equal to 
   * msgLevel. 
   * If the newLevel parameter is specified, set the current logging level to
   * newLevel and ignore the first two parameters.
  */
  void logger(int msgLevel, const char *msg, int newLevel = -1);
}

#endif