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/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2015 CERN
*
* Author: Joaquim Rocha <joaquim.rocha@cern.ch>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
*/
/** \file
*
* This is an OSD class that implements methods for object numeric options on
* its omap values.
*
*/
#include "objclass/objclass.h"
#include <errno.h>
#include <string>
#include <sstream>
#include <cstdio>
#include <include/compat.h>
#define DECIMAL_PRECISION 10
CLS_VER(1,0)
CLS_NAME(numops)
static int add(cls_method_context_t hctx, bufferlist *in, bufferlist *out)
{
string key, diff_str;
auto iter = in->cbegin();
try {
decode(key, iter);
decode(diff_str, iter);
} catch (const buffer::error &err) {
CLS_LOG(20, "add: invalid decode of input");
return -EINVAL;
}
char *end_ptr = 0;
double difference = strtod(diff_str.c_str(), &end_ptr);
if (end_ptr && *end_ptr != '\0') {
CLS_ERR("add: invalid input value: %s", diff_str.c_str());
return -EINVAL;
}
bufferlist bl;
int ret = cls_cxx_map_get_val(hctx, key, &bl);
double value;
if (ret == -ENODATA || bl.length() == 0) {
value = 0;
} else if (ret < 0) {
if (ret != -ENOENT) {
CLS_ERR("add: error reading omap key %s: %d", key.c_str(), ret);
}
return ret;
} else {
std::string stored_value(bl.c_str(), bl.length());
end_ptr = 0;
value = strtod(stored_value.c_str(), &end_ptr);
if (end_ptr && *end_ptr != '\0') {
CLS_ERR("add: invalid stored value: %s", stored_value.c_str());
return -EBADMSG;
}
}
value += difference;
std::stringstream stream;
stream << std::setprecision(DECIMAL_PRECISION) << value;
bufferlist new_value;
new_value.append(stream.str());
return cls_cxx_map_set_val(hctx, key, &new_value);
}
static int mul(cls_method_context_t hctx, bufferlist *in, bufferlist *out)
{
string key, diff_str;
auto iter = in->cbegin();
try {
decode(key, iter);
decode(diff_str, iter);
} catch (const buffer::error &err) {
CLS_LOG(20, "mul: invalid decode of input");
return -EINVAL;
}
char *end_ptr = 0;
double difference = strtod(diff_str.c_str(), &end_ptr);
if (end_ptr && *end_ptr != '\0') {
CLS_ERR("mul: invalid input value: %s", diff_str.c_str());
return -EINVAL;
}
bufferlist bl;
int ret = cls_cxx_map_get_val(hctx, key, &bl);
double value;
if (ret == -ENODATA || bl.length() == 0) {
value = 0;
} else if (ret < 0) {
if (ret != -ENOENT) {
CLS_ERR("mul: error reading omap key %s: %d", key.c_str(), ret);
}
return ret;
} else {
std::string stored_value(bl.c_str(), bl.length());
end_ptr = 0;
value = strtod(stored_value.c_str(), &end_ptr);
if (end_ptr && *end_ptr != '\0') {
CLS_ERR("mul: invalid stored value: %s", stored_value.c_str());
return -EBADMSG;
}
}
value *= difference;
std::stringstream stream;
stream << std::setprecision(DECIMAL_PRECISION) << value;
bufferlist new_value;
new_value.append(stream.str());
return cls_cxx_map_set_val(hctx, key, &new_value);
}
CLS_INIT(numops)
{
CLS_LOG(20, "loading cls_numops");
cls_handle_t h_class;
cls_method_handle_t h_add;
cls_method_handle_t h_mul;
cls_register("numops", &h_class);
cls_register_cxx_method(h_class, "add",
CLS_METHOD_RD | CLS_METHOD_WR,
add, &h_add);
cls_register_cxx_method(h_class, "mul",
CLS_METHOD_RD | CLS_METHOD_WR,
mul, &h_mul);
}
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