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/*
This file is part of TALER
Copyright (C) 2014, 2015 GNUnet e.V.
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
TALER; see the file COPYING. If not, If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file include/taler_util.h
* @brief Interface for common utility functions
* @author Sree Harsha Totakura <sreeharsha@totakura.in>
*/
#ifndef TALER_UTIL_H
#define TALER_UTIL_H
#include <gnunet/gnunet_util_lib.h>
#include "taler_amount_lib.h"
#include "taler_crypto_lib.h"
#include "taler_json_lib.h"
/* Define logging functions */
#define TALER_LOG_DEBUG(...) \
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
#define TALER_LOG_WARNING(...) \
GNUNET_log (GNUNET_ERROR_TYPE_WARNING, __VA_ARGS__)
#define TALER_LOG_ERROR(...) \
GNUNET_log (GNUNET_ERROR_TYPE_ERROR, __VA_ARGS__)
/**
* Tests a given as assertion and if failed prints it as a warning with the
* given reason
*
* @param EXP the expression to test as assertion
* @param reason string to print as warning
*/
#define TALER_assert_as(EXP, reason) \
do { \
if (EXP) break; \
TALER_LOG_ERROR("%s at %s:%d\n", reason, __FILE__, __LINE__); \
abort(); \
} while(0)
/**
* Log an error message at log-level 'level' that indicates
* a failure of the command 'cmd' with the message given
* by gcry_strerror(rc).
*/
#define TALER_LOG_GCRY_ERROR(cmd, rc) do { TALER_LOG_ERROR("`%s' failed at %s:%d with error: %s\n", cmd, __FILE__, __LINE__, gcry_strerror(rc)); } while(0)
#define TALER_gcry_ok(cmd) \
do {int rc; rc = cmd; if (!rc) break; TALER_LOG_ERROR("A Gcrypt call failed at %s:%d with error: %s\n", __FILE__, __LINE__, gcry_strerror(rc)); abort(); } while (0)
/**
* Initialize Gcrypt library.
*/
void
TALER_gcrypt_init (void);
/**
* Convert a buffer to an 8-character string
* representative of the contents. This is used
* for logging binary data when debugging.
*
* @param buf buffer to log
* @param buf_size number of bytes in @a buf
* @return text representation of buf, valid until next
* call to this function
*/
const char *
TALER_b2s (const void *buf,
size_t buf_size);
/**
* Convert a fixed-sized object to a string using
* #TALER_b2s().
*
* @param obj address of object to convert
* @return string representing the binary obj buffer
*/
#define TALER_B2S(obj) TALER_b2s (obj, sizeof (*obj))
/**
* Round a time value so that it is suitable for transmission
* via JSON encodings.
*
* @param at time to round
* @return #GNUNET_OK if time was already rounded, #GNUNET_NO if
* it was just now rounded
*/
int
TALER_round_abs_time (struct GNUNET_TIME_Absolute *at);
/**
* Round a time value so that it is suitable for transmission
* via JSON encodings.
*
* @param rt time to round
* @return #GNUNET_OK if time was already rounded, #GNUNET_NO if
* it was just now rounded
*/
int
TALER_round_rel_time (struct GNUNET_TIME_Relative *rt);
/**
* Load configuration by parsing all configuration
* files in the given directory.
*
* @param base_dir directory with the configuration files
* @return NULL on error, otherwise configuration
*/
struct GNUNET_CONFIGURATION_Handle *
TALER_config_load (const char *base_dir);
/**
* Obtain denomination amount from configuration file.
*
* @param section section of the configuration to access
* @param option option of the configuration to access
* @param[out] denom set to the amount found in configuration
* @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
int
TALER_config_get_denom (struct GNUNET_CONFIGURATION_Handle *cfg,
const char *section,
const char *option,
struct TALER_Amount *denom);
/**
* Get the path to a specific Taler installation directory or, with
* #GNUNET_OS_IPK_SELF_PREFIX, the current running apps installation
* directory.
*
* @param dirkind what kind of directory is desired?
* @return a pointer to the dir path (to be freed by the caller)
*/
char *
TALER_OS_installation_get_path (enum GNUNET_OS_InstallationPathKind dirkind);
/**
* Print out details on command line options (implements --help).
*
* @param ctx command line processing context
* @param scls additional closure (points to about text)
* @param option name of the option
* @param value not used (NULL)
* @return #GNUNET_NO (do not continue, not an error)
*/
int
TALER_GETOPT_format_help_ (struct GNUNET_GETOPT_CommandLineProcessorContext *ctx,
void *scls,
const char *option,
const char *value);
/**
* Macro defining the option to print the command line
* help text (-h option).
*
* @param about string with brief description of the application
*/
#define TALER_GETOPT_OPTION_HELP(about) \
{ 'h', "help", (const char *) NULL, gettext_noop("print this help"), 0, &TALER_GETOPT_format_help_, (void *) about }
#endif
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