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common: new json_util.h

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With code to help factor out reading typed fields from JSON
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moneromooo-monero 2016-03-27 16:25:59 +01:00
parent 2b57845766
commit f8d05f3cd9
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// Copyright (c) 2016, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#pragma once
#define GET_FIELD_FROM_JSON_RETURN_ON_ERROR(json, name, type, jtype, mandatory) \
type field_##name; \
bool field_##name##_found = false; \
(void)field_##name##_found; \
do if (json.HasMember(#name)) \
{ \
if (json[#name].Is##jtype()) \
{ \
field_##name = json[#name].Get##jtype(); \
field_##name##_found = true; \
} \
else \
{ \
LOG_ERROR("Field " << #name << " found in JSON, but not " << #jtype); \
return false; \
} \
} \
else if (mandatory) \
{ \
LOG_ERROR("Field " << #name << " not found in JSON"); \
return false; \
} while(0)