annotate Core/Lua/LuaFunctionCall.cpp @ 1606:31f4adefb88f

issuing HTTP requests from the plugin SDK
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 01 Sep 2015 17:37:26 +0200
parents 9ea3d082b064
children 54bafe0e7e7b
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2015 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU General Public License as
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8 * published by the Free Software Foundation, either version 3 of the
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9 * License, or (at your option) any later version.
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10 *
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11 * In addition, as a special exception, the copyright holders of this
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12 * program give permission to link the code of its release with the
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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14 * that use the same license as the "OpenSSL" library), and distribute
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15 * the linked executables. You must obey the GNU General Public License
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16 * in all respects for all of the code used other than "OpenSSL". If you
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17 * modify file(s) with this exception, you may extend this exception to
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18 * your version of the file(s), but you are not obligated to do so. If
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19 * you do not wish to do so, delete this exception statement from your
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20 * version. If you delete this exception statement from all source files
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21 * in the program, then also delete it here.
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22 *
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23 * This program is distributed in the hope that it will be useful, but
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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26 * General Public License for more details.
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27 *
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28 * You should have received a copy of the GNU General Public License
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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30 **/
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31
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32
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33 #include "../PrecompiledHeaders.h"
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34 #include "LuaFunctionCall.h"
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35
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36 #include "../OrthancException.h"
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37 #include "../Logging.h"
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38
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39 #include <cassert>
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40 #include <stdio.h>
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41 #include <boost/lexical_cast.hpp>
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42
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43 namespace Orthanc
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44 {
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45 void LuaFunctionCall::CheckAlreadyExecuted()
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46 {
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47 if (isExecuted_)
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48 {
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49 throw OrthancException(ErrorCode_LuaAlreadyExecuted);
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50 }
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51 }
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52
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53 LuaFunctionCall::LuaFunctionCall(LuaContext& context,
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54 const char* functionName) :
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55 context_(context),
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56 isExecuted_(false)
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57 {
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58 // Clear the stack to fulfill the invariant
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59 lua_settop(context_.lua_, 0);
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60 lua_getglobal(context_.lua_, functionName);
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61 }
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62
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63 void LuaFunctionCall::PushString(const std::string& value)
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64 {
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65 CheckAlreadyExecuted();
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66 lua_pushlstring(context_.lua_, value.c_str(), value.size());
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67 }
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68
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69 void LuaFunctionCall::PushBoolean(bool value)
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70 {
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71 CheckAlreadyExecuted();
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72 lua_pushboolean(context_.lua_, value);
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73 }
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74
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75 void LuaFunctionCall::PushInteger(int value)
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76 {
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77 CheckAlreadyExecuted();
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78 lua_pushinteger(context_.lua_, value);
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79 }
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80
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81 void LuaFunctionCall::PushDouble(double value)
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82 {
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83 CheckAlreadyExecuted();
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84 lua_pushnumber(context_.lua_, value);
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85 }
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86
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87 void LuaFunctionCall::PushJson(const Json::Value& value)
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88 {
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89 CheckAlreadyExecuted();
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90 context_.PushJson(value);
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91 }
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92
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93 void LuaFunctionCall::ExecuteInternal(int numOutputs)
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94 {
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95 CheckAlreadyExecuted();
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96
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97 assert(lua_gettop(context_.lua_) >= 1);
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98 int nargs = lua_gettop(context_.lua_) - 1;
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99 int error = lua_pcall(context_.lua_, nargs, numOutputs, 0);
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100
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101 if (error)
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102 {
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103 assert(lua_gettop(context_.lua_) >= 1);
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104
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105 std::string description(lua_tostring(context_.lua_, -1));
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106 lua_pop(context_.lua_, 1); /* pop error message from the stack */
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107 LOG(ERROR) << description;
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108
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109 throw OrthancException(ErrorCode_CannotExecuteLua);
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110 }
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111
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112 if (lua_gettop(context_.lua_) < numOutputs)
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113 {
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114 throw OrthancException(ErrorCode_LuaBadOutput);
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115 }
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116
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117 isExecuted_ = true;
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118 }
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119
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120 bool LuaFunctionCall::ExecutePredicate()
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121 {
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122 ExecuteInternal(1);
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123
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124 if (!lua_isboolean(context_.lua_, 1))
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125 {
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126 throw OrthancException(ErrorCode_NotLuaPredicate);
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127 }
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128
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129 return lua_toboolean(context_.lua_, 1) != 0;
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130 }
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132
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133 void LuaFunctionCall::ExecuteToJson(Json::Value& result)
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134 {
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135 ExecuteInternal(1);
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136 context_.GetJson(result, lua_gettop(context_.lua_));
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137 }
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139
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140 void LuaFunctionCall::ExecuteToString(std::string& result)
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141 {
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142 ExecuteInternal(1);
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143
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144 int top = lua_gettop(context_.lua_);
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145 if (lua_isstring(context_.lua_, top))
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146 {
1448
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147 result = lua_tostring(context_.lua_, top);
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148 }
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149 else
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150 {
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151 throw OrthancException(ErrorCode_LuaReturnsNoString);
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152 }
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153 }
386
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154 }