granicus.if.org Git - icinga2/blob - lib/config/vmops.hpp

   1 /******************************************************************************
   2  * Icinga 2                                                                   *
   3  * Copyright (C) 2012-2016 Icinga Development Team (https://www.icinga.org/)  *
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  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the              *
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  18  ******************************************************************************/
  19
  20 #ifndef VMOPS_H
  21 #define VMOPS_H
  22
  23 #include "config/i2-config.hpp"
  24 #include "config/expression.hpp"
  25 #include "config/configitembuilder.hpp"
  26 #include "config/applyrule.hpp"
  27 #include "config/objectrule.hpp"
  28 #include "base/debuginfo.hpp"
  29 #include "base/array.hpp"
  30 #include "base/dictionary.hpp"
  31 #include "base/function.hpp"
  32 #include "base/scriptglobal.hpp"
  33 #include "base/exception.hpp"
  34 #include "base/convert.hpp"
  35 #include "base/objectlock.hpp"
  36 #include <boost/foreach.hpp>
  37 #include <boost/smart_ptr/make_shared.hpp>
  38 #include <map>
  39 #include <vector>
  40
  41 namespace icinga
  42 {
  43
  44 class VMOps
  45 {
  46 public:
  47         static inline Value Variable(ScriptFrame& frame, const String& name, const DebugInfo& debugInfo = DebugInfo())
  48         {
  49                 Value value;
  50                 if (frame.Locals && frame.Locals->Get(name, &value))
  51                         return value;
  52                 else if (frame.Self.IsObject() && frame.Locals != static_cast<Object::Ptr>(frame.Self) && static_cast<Object::Ptr>(frame.Self)->HasOwnField(name))
  53                         return GetField(frame.Self, name, frame.Sandboxed, debugInfo);
  54                 else
  55                         return ScriptGlobal::Get(name);
  56         }
  57
  58         static inline Value ConstructorCall(const Type::Ptr& type, const std::vector<Value>& args, const DebugInfo& debugInfo = DebugInfo())
  59         {
  60                 if (type->GetName() == "String") {
  61                         if (args.empty())
  62                                 return "";
  63                         else if (args.size() == 1)
  64                                 return Convert::ToString(args[0]);
  65                         else
  66                                 BOOST_THROW_EXCEPTION(ScriptError("Too many arguments for constructor."));
  67                 } else if (type->GetName() == "Number") {
  68                         if (args.empty())
  69                                 return 0;
  70                         else if (args.size() == 1)
  71                                 return Convert::ToDouble(args[0]);
  72                         else
  73                                 BOOST_THROW_EXCEPTION(ScriptError("Too many arguments for constructor."));
  74                 } else if (type->GetName() == "Boolean") {
  75                         if (args.empty())
  76                                 return 0;
  77                         else if (args.size() == 1)
  78                                 return Convert::ToBool(args[0]);
  79                         else
  80                                 BOOST_THROW_EXCEPTION(ScriptError("Too many arguments for constructor."));
  81                 } else if (args.size() == 1 && type->IsAssignableFrom(args[0].GetReflectionType()))
  82                         return args[0];
  83                 else
  84                         return type->Instantiate(args);
  85         }
  86
  87         static inline Value FunctionCall(ScriptFrame& frame, const Value& self, const Function::Ptr& func, const std::vector<Value>& arguments)
  88         {
  89                 ScriptFrame vframe;
  90
  91                 if (!self.IsEmpty() || self.IsString())
  92                         vframe.Self = self;
  93
  94                 return func->Invoke(arguments);
  95         }
  96
  97         static inline Value NewFunction(ScriptFrame& frame, const std::vector<String>& args,
  98             std::map<String, Expression *> *closedVars, const boost::shared_ptr<Expression>& expression)
  99         {
 100                 return new Function(boost::bind(&FunctionWrapper, _1, args,
 101                     EvaluateClosedVars(frame, closedVars), expression));
 102         }
 103
 104         static inline Value NewApply(ScriptFrame& frame, const String& type, const String& target, const String& name, const boost::shared_ptr<Expression>& filter,
 105                 const String& package, const String& fkvar, const String& fvvar, const boost::shared_ptr<Expression>& fterm, std::map<String, Expression *> *closedVars,
 106                 bool ignoreOnError, const boost::shared_ptr<Expression>& expression, const DebugInfo& debugInfo = DebugInfo())
 107         {
 108                 ApplyRule::AddRule(type, target, name, expression, filter, package, fkvar,
 109                     fvvar, fterm, ignoreOnError, debugInfo, EvaluateClosedVars(frame, closedVars));
 110
 111                 return Empty;
 112         }
 113
 114         static inline Value NewObject(ScriptFrame& frame, bool abstract, const String& type, const String& name, const boost::shared_ptr<Expression>& filter,
 115                 const String& zone, const String& package, bool ignoreOnError, std::map<String, Expression *> *closedVars, const boost::shared_ptr<Expression>& expression, const DebugInfo& debugInfo = DebugInfo())
 116         {
 117                 ConfigItemBuilder::Ptr item = new ConfigItemBuilder(debugInfo);
 118
 119                 String checkName = name;
 120
 121                 if (!abstract) {
 122                         Type::Ptr ptype = Type::GetByName(type);
 123
 124                         NameComposer *nc = dynamic_cast<NameComposer *>(ptype.get());
 125
 126                         if (nc)
 127                                 checkName = nc->MakeName(name, Dictionary::Ptr());
 128                 }
 129
 130                 if (!checkName.IsEmpty()) {
 131                         ConfigItem::Ptr oldItem = ConfigItem::GetByTypeAndName(type, checkName);
 132
 133                         if (oldItem) {
 134                                 std::ostringstream msgbuf;
 135                                 msgbuf << "Object '" << name << "' of type '" << type << "' re-defined: " << debugInfo << "; previous definition: " << oldItem->GetDebugInfo();
 136                                 BOOST_THROW_EXCEPTION(ScriptError(msgbuf.str(), debugInfo));
 137                         }
 138                 }
 139
 140                 item->SetType(type);
 141                 item->SetName(name);
 142
 143                 item->AddExpression(new OwnedExpression(expression));
 144                 item->SetAbstract(abstract);
 145                 item->SetScope(EvaluateClosedVars(frame, closedVars));
 146                 item->SetZone(zone);
 147                 item->SetPackage(package);
 148                 item->SetFilter(filter);
 149                 item->SetIgnoreOnError(ignoreOnError);
 150                 item->Compile()->Register();
 151
 152                 return Empty;
 153         }
 154
 155         static inline ExpressionResult For(ScriptFrame& frame, const String& fkvar, const String& fvvar, const Value& value, Expression *expression, const DebugInfo& debugInfo = DebugInfo())
 156         {
 157                 if (value.IsObjectType<Array>()) {
 158                         if (!fvvar.IsEmpty())
 159                                 BOOST_THROW_EXCEPTION(ScriptError("Cannot use dictionary iterator for array.", debugInfo));
 160
 161                         Array::Ptr arr = value;
 162
 163                         for (Array::SizeType i = 0; i < arr->GetLength(); i++) {
 164                                 frame.Locals->Set(fkvar, arr->Get(i));
 165                                 ExpressionResult res = expression->Evaluate(frame);
 166                                 CHECK_RESULT_LOOP(res);
 167                         }
 168                 } else if (value.IsObjectType<Dictionary>()) {
 169                         if (fvvar.IsEmpty())
 170                                 BOOST_THROW_EXCEPTION(ScriptError("Cannot use array iterator for dictionary.", debugInfo));
 171
 172                         Dictionary::Ptr dict = value;
 173                         std::vector<String> keys;
 174
 175                         {
 176                                 ObjectLock olock(dict);
 177                                 BOOST_FOREACH(const Dictionary::Pair& kv, dict) {
 178                                         keys.push_back(kv.first);
 179                                 }
 180                         }
 181
 182                         BOOST_FOREACH(const String& key, keys) {
 183                                 frame.Locals->Set(fkvar, key);
 184                                 frame.Locals->Set(fvvar, dict->Get(key));
 185                                 ExpressionResult res = expression->Evaluate(frame);
 186                                 CHECK_RESULT_LOOP(res);
 187                         }
 188                 } else
 189                         BOOST_THROW_EXCEPTION(ScriptError("Invalid type in for expression: " + value.GetTypeName(), debugInfo));
 190
 191                 return Empty;
 192         }
 193
 194         static inline Value GetField(const Value& context, const String& field, bool sandboxed = false, const DebugInfo& debugInfo = DebugInfo())
 195         {
 196                 if (context.IsEmpty() && !context.IsString())
 197                         return Empty;
 198
 199                 if (!context.IsObject())
 200                         return GetPrototypeField(context, field, true, debugInfo);
 201
 202                 Object::Ptr object = context;
 203
 204                 return object->GetFieldByName(field, sandboxed, debugInfo);
 205         }
 206
 207         static inline void SetField(const Object::Ptr& context, const String& field, const Value& value, const DebugInfo& debugInfo = DebugInfo())
 208         {
 209                 if (!context)
 210                         BOOST_THROW_EXCEPTION(ScriptError("Cannot set field '" + field + "' on a value that is not an object.", debugInfo));
 211
 212                 return context->SetFieldByName(field, value, debugInfo);
 213         }
 214
 215 private:
 216         static inline Value FunctionWrapper(const std::vector<Value>& arguments,
 217             const std::vector<String>& funcargs, const Dictionary::Ptr& closedVars, const boost::shared_ptr<Expression>& expr)
 218         {
 219                 if (arguments.size() < funcargs.size())
 220                         BOOST_THROW_EXCEPTION(std::invalid_argument("Too few arguments for function"));
 221
 222                 ScriptFrame *frame = ScriptFrame::GetCurrentFrame();
 223
 224                 if (closedVars)
 225                         closedVars->CopyTo(frame->Locals);
 226
 227                 for (std::vector<Value>::size_type i = 0; i < std::min(arguments.size(), funcargs.size()); i++)
 228                         frame->Locals->Set(funcargs[i], arguments[i]);
 229
 230                 return expr->Evaluate(*frame);
 231         }
 232
 233         static inline Dictionary::Ptr EvaluateClosedVars(ScriptFrame& frame, std::map<String, Expression *> *closedVars)
 234         {
 235                 Dictionary::Ptr locals;
 236
 237                 if (closedVars) {
 238                         locals = new Dictionary();
 239
 240                         typedef std::pair<String, Expression *> ClosedVar;
 241                         BOOST_FOREACH(const ClosedVar& cvar, *closedVars) {
 242                                 locals->Set(cvar.first, cvar.second->Evaluate(frame));
 243                         }
 244                 }
 245
 246                 return locals;
 247         }
 248 };
 249
 250 }
 251
 252 #endif /* VMOPS_H */