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annotate Core/Lua/LuaContext.cpp @ 1055:6f923d52a46c

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call Web services from Lua
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 24 Jul 2014 11:37:02 +0200
parents cc4ff680e2a0
children 6e7e5ed91c2d
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2014 Medical Physics Department, CHU of Liege,
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4 * 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 "LuaContext.h"
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35
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36 #include <glog/logging.h>
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37 #include <cassert>
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38
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39 extern "C"
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40 {
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41 #include <lualib.h>
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42 #include <lauxlib.h>
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43 }
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44
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45 namespace Orthanc
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46 {
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47 LuaContext& LuaContext::GetLuaContext(lua_State *state)
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48 {
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49 // Get the pointer to the "LuaContext" underlying object
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50 lua_getglobal(state, "_LuaContext");
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51 assert(lua_type(state, -1) == LUA_TLIGHTUSERDATA);
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52 LuaContext* that = const_cast<LuaContext*>(reinterpret_cast<const LuaContext*>(lua_topointer(state, -1)));
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53 assert(that != NULL);
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54 lua_pop(state, 1);
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55
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56 return *that;
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57 }
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58
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59 int LuaContext::PrintToLog(lua_State *state)
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60 {
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61 LuaContext& that = GetLuaContext(state);
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62
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63 // http://medek.wordpress.com/2009/02/03/wrapping-lua-errors-and-print-function/
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64 int nArgs = lua_gettop(state);
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65 lua_getglobal(state, "tostring");
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66
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67 // Make sure you start at 1 *NOT* 0 for arrays in Lua.
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68 std::string result;
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69
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70 for (int i = 1; i <= nArgs; i++)
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71 {
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72 const char *s;
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73 lua_pushvalue(state, -1);
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74 lua_pushvalue(state, i);
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75 lua_call(state, 1, 1);
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76 s = lua_tostring(state, -1);
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77
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78 if (result.size() > 0)
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79 result.append(", ");
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80
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81 if (s == NULL)
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82 result.append("<No conversion to string>");
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83 else
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84 result.append(s);
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85
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86 lua_pop(state, 1);
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87 }
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88
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89 LOG(WARNING) << "Lua says: " << result;
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90 that.log_.append(result);
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91 that.log_.append("\n");
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92
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93 return 0;
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94 }
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95
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96
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97 int LuaContext::SetHttpCredentials(lua_State *state)
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98 {
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99 LuaContext& that = GetLuaContext(state);
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100
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101 // Check the types of the arguments
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102 int nArgs = lua_gettop(state);
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103 if (nArgs != 2 ||
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104 !lua_isstring(state, 1) || // Username
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105 !lua_isstring(state, 2)) // Password
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106 {
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107 LOG(ERROR) << "Lua: Bad parameters to SetHttpCredentials()";
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108 }
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109 else
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110 {
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111 // Configure the HTTP client
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112 const char* username = lua_tostring(state, 1);
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113 const char* password = lua_tostring(state, 2);
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114 that.httpClient_.SetCredentials(username, password);
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115 }
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116
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117 return 0;
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118 }
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119
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120
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121 bool LuaContext::AnswerHttpQuery(lua_State* state)
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122 {
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123 std::string str;
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124
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125 try
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126 {
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127 httpClient_.Apply(str);
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128 }
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129 catch (OrthancException& e)
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130 {
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131 return false;
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132 }
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133
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134 // Return the result of the HTTP request
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135 lua_pushstring(state, str.c_str());
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136
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137 return true;
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138 }
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139
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140
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141 int LuaContext::CallHttpGet(lua_State *state)
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142 {
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143 LuaContext& that = GetLuaContext(state);
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144
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145 // Check the types of the arguments
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146 int nArgs = lua_gettop(state);
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147 if (nArgs != 1 || !lua_isstring(state, 1)) // URL
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148 {
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149 LOG(ERROR) << "Lua: Bad parameters to HttpGet()";
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150 lua_pushstring(state, "ERROR");
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151 return 1;
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152 }
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153
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154 // Configure the HTTP client class
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155 const char* url = lua_tostring(state, 1);
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156 that.httpClient_.SetMethod(HttpMethod_Get);
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157 that.httpClient_.SetUrl(url);
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158
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159 // Do the HTTP GET request
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160 if (!that.AnswerHttpQuery(state))
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161 {
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162 LOG(ERROR) << "Lua: Error in HttpGet() for URL " << url;
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163 lua_pushstring(state, "ERROR");
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164 }
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165
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166 return 1;
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167 }
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168
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169
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170 int LuaContext::CallHttpPostOrPut(lua_State *state,
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171 HttpMethod method)
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172 {
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173 LuaContext& that = GetLuaContext(state);
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174
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175 // Check the types of the arguments
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176 int nArgs = lua_gettop(state);
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177 if ((nArgs != 1 && nArgs != 2) ||
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178 !lua_isstring(state, 1) || // URL
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179 (nArgs >= 2 && !lua_isstring(state, 2))) // Body data
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180 {
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181 LOG(ERROR) << "Lua: Bad parameters to HttpPost() or HttpPut()";
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182 lua_pushstring(state, "ERROR");
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183 return 1;
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184 }
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185
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186 // Configure the HTTP client class
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187 const char* url = lua_tostring(state, 1);
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188 that.httpClient_.SetMethod(method);
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189 that.httpClient_.SetUrl(url);
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190
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191 if (nArgs >= 2)
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192 {
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193 that.httpClient_.SetPostData(lua_tostring(state, 2));
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194 }
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195 else
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196 {
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197 that.httpClient_.AccessPostData().clear();
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198 }
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199
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200 // Do the HTTP POST/PUT request
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201 if (!that.AnswerHttpQuery(state))
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202 {
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203 LOG(ERROR) << "Lua: Error in HttpPost() or HttpPut() for URL " << url;
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204 lua_pushstring(state, "ERROR");
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205 }
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206
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207 return 1;
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208 }
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209
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210
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211 int LuaContext::CallHttpPost(lua_State *state)
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212 {
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213 return CallHttpPostOrPut(state, HttpMethod_Post);
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214 }
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215
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216
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217 int LuaContext::CallHttpPut(lua_State *state)
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218 {
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219 return CallHttpPostOrPut(state, HttpMethod_Put);
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220 }
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221
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222
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223 int LuaContext::CallHttpDelete(lua_State *state)
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224 {
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225 LuaContext& that = GetLuaContext(state);
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226
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227 // Check the types of the arguments
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228 int nArgs = lua_gettop(state);
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229 if (nArgs != 1 || !lua_isstring(state, 1)) // URL
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230 {
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231 LOG(ERROR) << "Lua: Bad parameters to HttpDelete()";
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232 lua_pushstring(state, "ERROR");
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233 return 1;
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234 }
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235
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236 // Configure the HTTP client class
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237 const char* url = lua_tostring(state, 1);
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238 that.httpClient_.SetMethod(HttpMethod_Delete);
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239 that.httpClient_.SetUrl(url);
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240
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241 // Do the HTTP DELETE request
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242 std::string s;
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243 if (!that.httpClient_.Apply(s))
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244 {
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245 LOG(ERROR) << "Lua: Error in HttpDelete() for URL " << url;
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246 lua_pushstring(state, "ERROR");
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247 }
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248 else
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249 {
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250 lua_pushstring(state, "SUCCESS");
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251 }
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252
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253 return 1;
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254 }
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255
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256
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257 void LuaContext::PushJson(const Json::Value& value)
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258 {
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259 if (value.isString())
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260 {
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261 lua_pushstring(lua_, value.asCString());
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262 }
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263 else if (value.isDouble())
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264 {
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265 lua_pushnumber(lua_, value.asDouble());
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266 }
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267 else if (value.isInt())
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268 {
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269 lua_pushinteger(lua_, value.asInt());
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270 }
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271 else if (value.isUInt())
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272 {
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273 lua_pushinteger(lua_, value.asUInt());
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274 }
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275 else if (value.isBool())
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276 {
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277 lua_pushboolean(lua_, value.asBool());
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278 }
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279 else if (value.isNull())
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280 {
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281 lua_pushnil(lua_);
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282 }
92f4bf2c5d73 HTTP GET in Lua
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283 else if (value.isArray())
92f4bf2c5d73 HTTP GET in Lua
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diff changeset
284 {
92f4bf2c5d73 HTTP GET in Lua
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285 lua_newtable(lua_);
92f4bf2c5d73 HTTP GET in Lua
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286
92f4bf2c5d73 HTTP GET in Lua
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287 // http://lua-users.org/wiki/SimpleLuaApiExample
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288 for (Json::Value::ArrayIndex i = 0; i < value.size(); i++)
92f4bf2c5d73 HTTP GET in Lua
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289 {
92f4bf2c5d73 HTTP GET in Lua
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290 // Push the table index (note the "+1" because of Lua conventions)
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291 lua_pushnumber(lua_, i + 1);
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parents: 1002
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292
92f4bf2c5d73 HTTP GET in Lua
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293 // Push the value of the cell
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294 PushJson(value[i]);
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295
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296 // Stores the pair in the table
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297 lua_rawset(lua_, -3);
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298 }
92f4bf2c5d73 HTTP GET in Lua
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299 }
92f4bf2c5d73 HTTP GET in Lua
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300 else if (value.isObject())
92f4bf2c5d73 HTTP GET in Lua
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301 {
92f4bf2c5d73 HTTP GET in Lua
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302 lua_newtable(lua_);
92f4bf2c5d73 HTTP GET in Lua
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diff changeset
303
92f4bf2c5d73 HTTP GET in Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1002
diff changeset
304 Json::Value::Members members = value.getMemberNames();
92f4bf2c5d73 HTTP GET in Lua
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parents: 1002
diff changeset
305
92f4bf2c5d73 HTTP GET in Lua
Sebastien Jodogne <s.jodogne@gmail.com>
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diff changeset
306 for (Json::Value::Members::const_iterator
92f4bf2c5d73 HTTP GET in Lua
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diff changeset
307 it = members.begin(); it != members.end(); ++it)
92f4bf2c5d73 HTTP GET in Lua
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parents: 1002
diff changeset
308 {
92f4bf2c5d73 HTTP GET in Lua
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309 // Push the index of the cell
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diff changeset
310 lua_pushstring(lua_, it->c_str());
92f4bf2c5d73 HTTP GET in Lua
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parents: 1002
diff changeset
311
92f4bf2c5d73 HTTP GET in Lua
Sebastien Jodogne <s.jodogne@gmail.com>
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312 // Push the value of the cell
92f4bf2c5d73 HTTP GET in Lua
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diff changeset
313 PushJson(value[*it]);
92f4bf2c5d73 HTTP GET in Lua
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parents: 1002
diff changeset
314
92f4bf2c5d73 HTTP GET in Lua
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315 // Stores the pair in the table
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316 lua_rawset(lua_, -3);
92f4bf2c5d73 HTTP GET in Lua
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parents: 1002
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317 }
92f4bf2c5d73 HTTP GET in Lua
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318 }
92f4bf2c5d73 HTTP GET in Lua
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319 else
92f4bf2c5d73 HTTP GET in Lua
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diff changeset
320 {
92f4bf2c5d73 HTTP GET in Lua
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321 throw LuaException("Unsupported JSON conversion");
92f4bf2c5d73 HTTP GET in Lua
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322 }
92f4bf2c5d73 HTTP GET in Lua
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parents: 1002
diff changeset
323 }
92f4bf2c5d73 HTTP GET in Lua
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diff changeset
324
386
7dec4f3c922c lua wrapper
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325
7dec4f3c922c lua wrapper
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326 LuaContext::LuaContext()
7dec4f3c922c lua wrapper
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327 {
7dec4f3c922c lua wrapper
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328 lua_ = luaL_newstate();
7dec4f3c922c lua wrapper
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329 if (!lua_)
7dec4f3c922c lua wrapper
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330 {
7dec4f3c922c lua wrapper
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331 throw LuaException("Unable to create the Lua context");
7dec4f3c922c lua wrapper
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parents:
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332 }
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
333
7dec4f3c922c lua wrapper
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parents:
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334 luaL_openlibs(lua_);
7dec4f3c922c lua wrapper
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335 lua_register(lua_, "print", PrintToLog);
1051
92f4bf2c5d73 HTTP GET in Lua
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diff changeset
336 lua_register(lua_, "HttpGet", CallHttpGet);
1052
cc4ff680e2a0 http requests in lua
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diff changeset
337 lua_register(lua_, "HttpPost", CallHttpPost);
cc4ff680e2a0 http requests in lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1051
diff changeset
338 lua_register(lua_, "HttpPut", CallHttpPut);
cc4ff680e2a0 http requests in lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1051
diff changeset
339 lua_register(lua_, "HttpDelete", CallHttpDelete);
1055
6f923d52a46c call Web services from Lua
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diff changeset
340 lua_register(lua_, "SetHttpCredentials", SetHttpCredentials);
418
b79bf2f4ab2e execution of lua through REST
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 397
diff changeset
341
b79bf2f4ab2e execution of lua through REST
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parents: 397
diff changeset
342 lua_pushlightuserdata(lua_, this);
b79bf2f4ab2e execution of lua through REST
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 397
diff changeset
343 lua_setglobal(lua_, "_LuaContext");
386
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
344 }
7dec4f3c922c lua wrapper
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parents:
diff changeset
345
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
346
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
347 LuaContext::~LuaContext()
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
348 {
7dec4f3c922c lua wrapper
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parents:
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349 lua_close(lua_);
7dec4f3c922c lua wrapper
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parents:
diff changeset
350 }
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
351
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
352
1055
6f923d52a46c call Web services from Lua
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parents: 1052
diff changeset
353 void LuaContext::ExecuteInternal(std::string* output,
6f923d52a46c call Web services from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1052
diff changeset
354 const std::string& command)
386
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
355 {
418
b79bf2f4ab2e execution of lua through REST
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 397
diff changeset
356 log_.clear();
386
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
357 int error = (luaL_loadbuffer(lua_, command.c_str(), command.size(), "line") ||
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
358 lua_pcall(lua_, 0, 0, 0));
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
359
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
360 if (error)
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
361 {
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
362 assert(lua_gettop(lua_) >= 1);
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
363
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
364 std::string description(lua_tostring(lua_, -1));
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
365 lua_pop(lua_, 1); /* pop error message from the stack */
1055
6f923d52a46c call Web services from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1052
diff changeset
366 LOG(ERROR) << "Error while executing Lua script: " << description;
386
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
367 throw LuaException(description);
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
368 }
418
b79bf2f4ab2e execution of lua through REST
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 397
diff changeset
369
b79bf2f4ab2e execution of lua through REST
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 397
diff changeset
370 if (output != NULL)
b79bf2f4ab2e execution of lua through REST
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 397
diff changeset
371 {
b79bf2f4ab2e execution of lua through REST
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 397
diff changeset
372 *output = log_;
b79bf2f4ab2e execution of lua through REST
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 397
diff changeset
373 }
386
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
374 }
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
375
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
376
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
377 void LuaContext::Execute(EmbeddedResources::FileResourceId resource)
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
378 {
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
379 std::string command;
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
380 EmbeddedResources::GetFileResource(command, resource);
1055
6f923d52a46c call Web services from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1052
diff changeset
381 ExecuteInternal(NULL, command);
386
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
382 }
397
941ea46e9e26 lua filter of new instances
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 386
diff changeset
383
941ea46e9e26 lua filter of new instances
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 386
diff changeset
384
941ea46e9e26 lua filter of new instances
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 386
diff changeset
385 bool LuaContext::IsExistingFunction(const char* name)
941ea46e9e26 lua filter of new instances
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 386
diff changeset
386 {
941ea46e9e26 lua filter of new instances
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 386
diff changeset
387 lua_settop(lua_, 0);
941ea46e9e26 lua filter of new instances
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 386
diff changeset
388 lua_getglobal(lua_, name);
941ea46e9e26 lua filter of new instances
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 386
diff changeset
389 return lua_type(lua_, -1) == LUA_TFUNCTION;
941ea46e9e26 lua filter of new instances
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 386
diff changeset
390 }
1055
6f923d52a46c call Web services from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1052
diff changeset
391
6f923d52a46c call Web services from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1052
diff changeset
392
6f923d52a46c call Web services from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1052
diff changeset
393 void LuaContext::Execute(Json::Value& output,
6f923d52a46c call Web services from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1052
diff changeset
394 const std::string& command)
6f923d52a46c call Web services from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1052
diff changeset
395 {
6f923d52a46c call Web services from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1052
diff changeset
396 std::string s;
6f923d52a46c call Web services from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1052
diff changeset
397 ExecuteInternal(&s, command);
6f923d52a46c call Web services from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1052
diff changeset
398
6f923d52a46c call Web services from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1052
diff changeset
399 Json::Reader reader;
6f923d52a46c call Web services from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1052
diff changeset
400 if (!reader.parse(s, output))
6f923d52a46c call Web services from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1052
diff changeset
401 {
6f923d52a46c call Web services from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1052
diff changeset
402 throw OrthancException(ErrorCode_BadFileFormat);
6f923d52a46c call Web services from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1052
diff changeset
403 }
6f923d52a46c call Web services from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1052
diff changeset
404 }
6f923d52a46c call Web services from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1052
diff changeset
405
386
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
406 }