mirror of https://github.com/Icinga/icinga2.git
373 lines
8.2 KiB
C++
373 lines
8.2 KiB
C++
/******************************************************************************
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* Icinga 2 *
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* Copyright (C) 2012-2014 Icinga Development Team (http://www.icinga.org) *
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* *
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* This program is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU General Public License *
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* as published by the Free Software Foundation; either version 2 *
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* of the License, or (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the Free Software Foundation *
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
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******************************************************************************/
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#include "base/json.hpp"
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#include "base/debug.hpp"
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#include "base/dictionary.hpp"
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#include "base/array.hpp"
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#include "base/objectlock.hpp"
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#include "base/convert.hpp"
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#include <boost/foreach.hpp>
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#include <boost/exception_ptr.hpp>
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#include <yajl/yajl_version.h>
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#include <yajl/yajl_gen.h>
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#include <yajl/yajl_parse.h>
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#include <stack>
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using namespace icinga;
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static void Encode(yajl_gen handle, const Value& value);
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#if YAJL_MAJOR < 2
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typedef unsigned int yajl_size;
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#else /* YAJL_MAJOR */
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typedef size_t yajl_size;
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#endif /* YAJL_MAJOR */
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static void EncodeDictionary(yajl_gen handle, const Dictionary::Ptr& dict)
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{
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yajl_gen_map_open(handle);
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ObjectLock olock(dict);
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BOOST_FOREACH(const Dictionary::Pair& kv, dict) {
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yajl_gen_string(handle, reinterpret_cast<const unsigned char *>(kv.first.CStr()), kv.first.GetLength());
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Encode(handle, kv.second);
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}
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yajl_gen_map_close(handle);
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}
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static void EncodeArray(yajl_gen handle, const Array::Ptr& arr)
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{
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yajl_gen_array_open(handle);
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ObjectLock olock(arr);
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BOOST_FOREACH(const Value& value, arr) {
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Encode(handle, value);
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}
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yajl_gen_array_close(handle);
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}
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static void Encode(yajl_gen handle, const Value& value)
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{
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String str;
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switch (value.GetType()) {
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case ValueNumber:
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if (yajl_gen_double(handle, static_cast<double>(value)) == yajl_gen_invalid_number)
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yajl_gen_double(handle, 0);
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break;
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case ValueBoolean:
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yajl_gen_bool(handle, value.ToBool());
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break;
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case ValueString:
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str = value;
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yajl_gen_string(handle, reinterpret_cast<const unsigned char *>(str.CStr()), str.GetLength());
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break;
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case ValueObject:
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if (value.IsObjectType<Dictionary>())
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EncodeDictionary(handle, value);
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else if (value.IsObjectType<Array>())
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EncodeArray(handle, value);
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else
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yajl_gen_null(handle);
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break;
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case ValueEmpty:
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yajl_gen_null(handle);
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break;
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default:
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VERIFY(!"Invalid variant type.");
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}
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}
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String icinga::JsonEncode(const Value& value)
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{
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#if YAJL_MAJOR < 2
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yajl_gen_config conf = { 0, "" };
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yajl_gen handle = yajl_gen_alloc(&conf, NULL);
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#else /* YAJL_MAJOR */
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yajl_gen handle = yajl_gen_alloc(NULL);
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#endif /* YAJL_MAJOR */
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Encode(handle, value);
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const unsigned char *buf;
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yajl_size len;
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yajl_gen_get_buf(handle, &buf, &len);
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String result = String(buf, buf + len);
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yajl_gen_free(handle);
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return result;
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}
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struct JsonElement
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{
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String Key;
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bool KeySet;
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Value EValue;
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JsonElement(void)
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: KeySet(false)
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{ }
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};
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struct JsonContext
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{
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public:
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void Push(const Value& value)
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{
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JsonElement element;
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element.EValue = value;
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m_Stack.push(element);
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}
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JsonElement Pop(void)
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{
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JsonElement value = m_Stack.top();
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m_Stack.pop();
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return value;
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}
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void AddValue(const Value& value)
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{
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if (m_Stack.empty()) {
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JsonElement element;
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element.EValue = value;
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m_Stack.push(element);
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return;
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}
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JsonElement& element = m_Stack.top();
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if (element.EValue.IsObjectType<Dictionary>()) {
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if (!element.KeySet) {
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element.Key = value;
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element.KeySet = true;
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} else {
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Dictionary::Ptr dict = element.EValue;
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dict->Set(element.Key, value);
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element.KeySet = false;
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}
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} else if (element.EValue.IsObjectType<Array>()) {
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Array::Ptr arr = element.EValue;
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arr->Add(value);
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} else {
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BOOST_THROW_EXCEPTION(std::invalid_argument("Cannot add value to JSON element."));
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}
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}
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Value GetValue(void) const
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{
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ASSERT(m_Stack.size() == 1);
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return m_Stack.top().EValue;
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}
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void SaveException(void)
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{
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m_Exception = boost::current_exception();
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}
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void ThrowException(void) const
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{
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if (m_Exception)
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boost::rethrow_exception(m_Exception);
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}
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private:
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std::stack<JsonElement> m_Stack;
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Value m_Key;
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boost::exception_ptr m_Exception;
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};
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static int DecodeNull(void *ctx)
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{
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JsonContext *context = static_cast<JsonContext *>(ctx);
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try {
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context->AddValue(Empty);
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} catch (...) {
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context->SaveException();
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return 0;
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}
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return 1;
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}
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static int DecodeBoolean(void *ctx, int value)
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{
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JsonContext *context = static_cast<JsonContext *>(ctx);
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try {
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context->AddValue(static_cast<bool>(value));
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} catch (...) {
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context->SaveException();
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return 0;
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}
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return 1;
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}
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static int DecodeNumber(void *ctx, const char *str, yajl_size len)
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{
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JsonContext *context = static_cast<JsonContext *>(ctx);
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try {
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String jstr = String(str, str + len);
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context->AddValue(Convert::ToDouble(jstr));
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} catch (...) {
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context->SaveException();
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return 0;
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}
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return 1;
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}
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static int DecodeString(void *ctx, const unsigned char *str, yajl_size len)
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{
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JsonContext *context = static_cast<JsonContext *>(ctx);
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try {
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context->AddValue(String(str, str + len));
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} catch (...) {
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context->SaveException();
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return 0;
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}
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return 1;
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}
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static int DecodeStartMap(void *ctx)
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{
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JsonContext *context = static_cast<JsonContext *>(ctx);
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try {
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context->Push(new Dictionary());
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} catch (...) {
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context->SaveException();
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return 0;
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}
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return 1;
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}
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static int DecodeEndMap(void *ctx)
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{
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JsonContext *context = static_cast<JsonContext *>(ctx);
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try {
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context->AddValue(context->Pop().EValue);
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} catch (...) {
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context->SaveException();
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return 0;
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}
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return 1;
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}
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static int DecodeStartArray(void *ctx)
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{
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JsonContext *context = static_cast<JsonContext *>(ctx);
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try {
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context->Push(new Array());
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} catch (...) {
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context->SaveException();
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return 0;
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}
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return 1;
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}
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static int DecodeEndArray(void *ctx)
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{
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JsonContext *context = static_cast<JsonContext *>(ctx);
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try {
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context->AddValue(context->Pop().EValue);
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} catch (...) {
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context->SaveException();
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return 0;
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}
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return 1;
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}
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Value icinga::JsonDecode(const String& data)
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{
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static const yajl_callbacks callbacks = {
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DecodeNull,
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DecodeBoolean,
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NULL,
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NULL,
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DecodeNumber,
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DecodeString,
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DecodeStartMap,
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DecodeString,
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DecodeEndMap,
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DecodeStartArray,
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DecodeEndArray
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};
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yajl_handle handle;
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#if YAJL_MAJOR < 2
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yajl_parser_config cfg = { 1, 0 };
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#endif /* YAJL_MAJOR */
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JsonContext context;
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#if YAJL_MAJOR < 2
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handle = yajl_alloc(&callbacks, &cfg, NULL, &context);
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#else /* YAJL_MAJOR */
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handle = yajl_alloc(&callbacks, NULL, &context);
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yajl_config(handle, yajl_dont_validate_strings, 1);
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#endif /* YAJL_MAJOR */
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yajl_parse(handle, reinterpret_cast<const unsigned char *>(data.CStr()), data.GetLength());
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#if YAJL_MAJOR < 2
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if (yajl_parse_complete(handle) != yajl_status_ok) {
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#else /* YAJL_MAJOR */
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if (yajl_complete_parse(handle) != yajl_status_ok) {
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#endif /* YAJL_MAJOR */
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unsigned char *internal_err_str = yajl_get_error(handle, 1, reinterpret_cast<const unsigned char *>(data.CStr()), data.GetLength());
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String msg = reinterpret_cast<char *>(internal_err_str);
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yajl_free_error(handle, internal_err_str);
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yajl_free(handle);
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/* throw saved exception (if there is one) */
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context.ThrowException();
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BOOST_THROW_EXCEPTION(std::invalid_argument(msg));
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}
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yajl_free(handle);
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return context.GetValue();
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}
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