Mercurial > hg > orthanc
annotate Core/Lua/LuaContext.cpp @ 2103:a89ca69ec1d1
ImageAccessor::SetFormat
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Thu, 13 Oct 2016 11:42:30 +0200 |
parents | b1291df2f780 |
children | 0fb6e0461105 |
rev | line source |
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386 | 1 /** |
2 * Orthanc - A Lightweight, RESTful DICOM Store | |
1900 | 3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics |
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4 * Department, University Hospital of Liege, Belgium |
386 | 5 * |
6 * This program is free software: you can redistribute it and/or | |
7 * modify it under the terms of the GNU General Public License as | |
8 * published by the Free Software Foundation, either version 3 of the | |
9 * License, or (at your option) any later version. | |
10 * | |
11 * In addition, as a special exception, the copyright holders of this | |
12 * program give permission to link the code of its release with the | |
13 * OpenSSL project's "OpenSSL" library (or with modified versions of it | |
14 * that use the same license as the "OpenSSL" library), and distribute | |
15 * the linked executables. You must obey the GNU General Public License | |
16 * in all respects for all of the code used other than "OpenSSL". If you | |
17 * modify file(s) with this exception, you may extend this exception to | |
18 * your version of the file(s), but you are not obligated to do so. If | |
19 * you do not wish to do so, delete this exception statement from your | |
20 * version. If you delete this exception statement from all source files | |
21 * in the program, then also delete it here. | |
22 * | |
23 * This program is distributed in the hope that it will be useful, but | |
24 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
26 * General Public License for more details. | |
27 * | |
28 * You should have received a copy of the GNU General Public License | |
29 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
30 **/ | |
31 | |
32 | |
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33 #include "../PrecompiledHeaders.h" |
386 | 34 #include "LuaContext.h" |
35 | |
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36 #include "../Logging.h" |
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37 #include "../OrthancException.h" |
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38 |
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39 #include <set> |
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40 #include <cassert> |
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41 #include <boost/lexical_cast.hpp> |
386 | 42 |
43 extern "C" | |
44 { | |
45 #include <lualib.h> | |
46 #include <lauxlib.h> | |
47 } | |
48 | |
49 namespace Orthanc | |
50 { | |
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51 static bool OnlyContainsDigits(const std::string& s) |
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52 { |
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53 for (size_t i = 0; i < s.size(); i++) |
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54 { |
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55 if (!isdigit(s[i])) |
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56 { |
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57 return false; |
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58 } |
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59 } |
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60 |
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61 return true; |
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62 } |
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63 |
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64 |
1051 | 65 LuaContext& LuaContext::GetLuaContext(lua_State *state) |
386 | 66 { |
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67 const void* value = GetGlobalVariable(state, "_LuaContext"); |
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68 assert(value != NULL); |
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69 |
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70 return *const_cast<LuaContext*>(reinterpret_cast<const LuaContext*>(value)); |
1051 | 71 } |
72 | |
73 int LuaContext::PrintToLog(lua_State *state) | |
74 { | |
75 LuaContext& that = GetLuaContext(state); | |
76 | |
386 | 77 // http://medek.wordpress.com/2009/02/03/wrapping-lua-errors-and-print-function/ |
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78 int nArgs = lua_gettop(state); |
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79 lua_getglobal(state, "tostring"); |
386 | 80 |
81 // Make sure you start at 1 *NOT* 0 for arrays in Lua. | |
82 std::string result; | |
83 | |
84 for (int i = 1; i <= nArgs; i++) | |
85 { | |
86 const char *s; | |
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87 lua_pushvalue(state, -1); |
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88 lua_pushvalue(state, i); |
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89 lua_call(state, 1, 1); |
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90 s = lua_tostring(state, -1); |
386 | 91 |
92 if (result.size() > 0) | |
93 result.append(", "); | |
94 | |
95 if (s == NULL) | |
96 result.append("<No conversion to string>"); | |
97 else | |
98 result.append(s); | |
99 | |
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100 lua_pop(state, 1); |
386 | 101 } |
102 | |
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103 LOG(WARNING) << "Lua says: " << result; |
1051 | 104 that.log_.append(result); |
105 that.log_.append("\n"); | |
386 | 106 |
107 return 0; | |
108 } | |
109 | |
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110 |
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111 int LuaContext::ParseJson(lua_State *state) |
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112 { |
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113 LuaContext& that = GetLuaContext(state); |
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114 |
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115 int nArgs = lua_gettop(state); |
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116 if (nArgs != 1 || |
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117 !lua_isstring(state, 1)) // Password |
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118 { |
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119 lua_pushnil(state); |
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120 return 1; |
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121 } |
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122 |
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123 const char* str = lua_tostring(state, 1); |
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124 |
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125 Json::Value value; |
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126 Json::Reader reader; |
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127 if (reader.parse(str, str + strlen(str), value)) |
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128 { |
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129 that.PushJson(value); |
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130 } |
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131 else |
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132 { |
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133 lua_pushnil(state); |
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134 } |
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135 |
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136 return 1; |
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137 } |
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138 |
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139 |
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140 int LuaContext::DumpJson(lua_State *state) |
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141 { |
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142 LuaContext& that = GetLuaContext(state); |
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143 |
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144 int nArgs = lua_gettop(state); |
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145 if ((nArgs != 1 && nArgs != 2) || |
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146 (nArgs == 2 && !lua_isboolean(state, 2))) |
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147 { |
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148 lua_pushnil(state); |
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149 return 1; |
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150 } |
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151 |
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152 bool keepStrings = false; |
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153 if (nArgs == 2) |
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154 { |
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155 keepStrings = lua_toboolean(state, 2) ? true : false; |
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156 } |
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157 |
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158 Json::Value json; |
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159 that.GetJson(json, 1, keepStrings); |
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160 |
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161 Json::FastWriter writer; |
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162 std::string s = writer.write(json); |
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163 lua_pushlstring(state, s.c_str(), s.size()); |
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164 |
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165 return 1; |
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166 } |
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167 |
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168 |
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169 int LuaContext::SetHttpCredentials(lua_State *state) |
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170 { |
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171 LuaContext& that = GetLuaContext(state); |
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172 |
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173 // Check the types of the arguments |
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174 int nArgs = lua_gettop(state); |
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175 if (nArgs != 2 || |
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176 !lua_isstring(state, 1) || // Username |
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177 !lua_isstring(state, 2)) // Password |
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178 { |
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179 LOG(ERROR) << "Lua: Bad parameters to SetHttpCredentials()"; |
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180 } |
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181 else |
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182 { |
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183 // Configure the HTTP client |
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184 const char* username = lua_tostring(state, 1); |
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185 const char* password = lua_tostring(state, 2); |
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186 that.httpClient_.SetCredentials(username, password); |
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187 } |
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188 |
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189 return 0; |
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190 } |
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191 |
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192 |
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193 bool LuaContext::AnswerHttpQuery(lua_State* state) |
1051 | 194 { |
195 std::string str; | |
196 | |
197 try | |
198 { | |
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199 httpClient_.Apply(str); |
1051 | 200 } |
1545 | 201 catch (OrthancException&) |
1051 | 202 { |
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203 return false; |
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204 } |
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205 |
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206 // Return the result of the HTTP request |
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207 lua_pushlstring(state, str.c_str(), str.size()); |
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208 |
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209 return true; |
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210 } |
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211 |
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212 |
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213 int LuaContext::CallHttpGet(lua_State *state) |
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214 { |
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215 LuaContext& that = GetLuaContext(state); |
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216 |
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217 // Check the types of the arguments |
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218 int nArgs = lua_gettop(state); |
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219 if (nArgs != 1 || !lua_isstring(state, 1)) // URL |
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220 { |
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221 LOG(ERROR) << "Lua: Bad parameters to HttpGet()"; |
1438 | 222 lua_pushnil(state); |
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223 return 1; |
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224 } |
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225 |
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226 // Configure the HTTP client class |
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227 const char* url = lua_tostring(state, 1); |
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228 that.httpClient_.SetMethod(HttpMethod_Get); |
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229 that.httpClient_.SetUrl(url); |
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230 |
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231 // Do the HTTP GET request |
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232 if (!that.AnswerHttpQuery(state)) |
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233 { |
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234 LOG(ERROR) << "Lua: Error in HttpGet() for URL " << url; |
1438 | 235 lua_pushnil(state); |
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236 } |
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237 |
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238 return 1; |
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239 } |
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240 |
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241 |
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242 int LuaContext::CallHttpPostOrPut(lua_State *state, |
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243 HttpMethod method) |
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244 { |
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245 LuaContext& that = GetLuaContext(state); |
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246 |
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247 // Check the types of the arguments |
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248 int nArgs = lua_gettop(state); |
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249 if ((nArgs != 1 && nArgs != 2) || |
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250 !lua_isstring(state, 1) || // URL |
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251 (nArgs >= 2 && !lua_isstring(state, 2))) // Body data |
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252 { |
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253 LOG(ERROR) << "Lua: Bad parameters to HttpPost() or HttpPut()"; |
1438 | 254 lua_pushnil(state); |
1051 | 255 return 1; |
256 } | |
257 | |
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258 // Configure the HTTP client class |
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259 const char* url = lua_tostring(state, 1); |
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260 that.httpClient_.SetMethod(method); |
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261 that.httpClient_.SetUrl(url); |
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262 |
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263 if (nArgs >= 2) |
1051 | 264 { |
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265 that.httpClient_.SetBody(lua_tostring(state, 2)); |
1051 | 266 } |
267 else | |
268 { | |
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269 that.httpClient_.GetBody().clear(); |
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270 } |
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271 |
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272 // Do the HTTP POST/PUT request |
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273 if (!that.AnswerHttpQuery(state)) |
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274 { |
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275 LOG(ERROR) << "Lua: Error in HttpPost() or HttpPut() for URL " << url; |
1438 | 276 lua_pushnil(state); |
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277 } |
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278 |
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279 return 1; |
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280 } |
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281 |
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282 |
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283 int LuaContext::CallHttpPost(lua_State *state) |
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284 { |
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285 return CallHttpPostOrPut(state, HttpMethod_Post); |
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286 } |
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287 |
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288 |
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289 int LuaContext::CallHttpPut(lua_State *state) |
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290 { |
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291 return CallHttpPostOrPut(state, HttpMethod_Put); |
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292 } |
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293 |
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294 |
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295 int LuaContext::CallHttpDelete(lua_State *state) |
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296 { |
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297 LuaContext& that = GetLuaContext(state); |
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298 |
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299 // Check the types of the arguments |
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300 int nArgs = lua_gettop(state); |
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301 if (nArgs != 1 || !lua_isstring(state, 1)) // URL |
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302 { |
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303 LOG(ERROR) << "Lua: Bad parameters to HttpDelete()"; |
1438 | 304 lua_pushnil(state); |
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305 return 1; |
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306 } |
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307 |
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308 // Configure the HTTP client class |
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309 const char* url = lua_tostring(state, 1); |
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310 that.httpClient_.SetMethod(HttpMethod_Delete); |
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311 that.httpClient_.SetUrl(url); |
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312 |
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313 // Do the HTTP DELETE request |
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314 std::string s; |
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315 if (!that.httpClient_.Apply(s)) |
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316 { |
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317 LOG(ERROR) << "Lua: Error in HttpDelete() for URL " << url; |
1438 | 318 lua_pushnil(state); |
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319 } |
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320 else |
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321 { |
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322 lua_pushstring(state, "SUCCESS"); |
1051 | 323 } |
324 | |
325 return 1; | |
326 } | |
327 | |
328 | |
329 void LuaContext::PushJson(const Json::Value& value) | |
330 { | |
331 if (value.isString()) | |
332 { | |
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333 const std::string s = value.asString(); |
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334 lua_pushlstring(lua_, s.c_str(), s.size()); |
1051 | 335 } |
336 else if (value.isDouble()) | |
337 { | |
338 lua_pushnumber(lua_, value.asDouble()); | |
339 } | |
340 else if (value.isInt()) | |
341 { | |
342 lua_pushinteger(lua_, value.asInt()); | |
343 } | |
344 else if (value.isUInt()) | |
345 { | |
346 lua_pushinteger(lua_, value.asUInt()); | |
347 } | |
348 else if (value.isBool()) | |
349 { | |
350 lua_pushboolean(lua_, value.asBool()); | |
351 } | |
352 else if (value.isNull()) | |
353 { | |
354 lua_pushnil(lua_); | |
355 } | |
356 else if (value.isArray()) | |
357 { | |
358 lua_newtable(lua_); | |
359 | |
360 // http://lua-users.org/wiki/SimpleLuaApiExample | |
361 for (Json::Value::ArrayIndex i = 0; i < value.size(); i++) | |
362 { | |
363 // Push the table index (note the "+1" because of Lua conventions) | |
364 lua_pushnumber(lua_, i + 1); | |
365 | |
366 // Push the value of the cell | |
367 PushJson(value[i]); | |
368 | |
369 // Stores the pair in the table | |
370 lua_rawset(lua_, -3); | |
371 } | |
372 } | |
373 else if (value.isObject()) | |
374 { | |
375 lua_newtable(lua_); | |
376 | |
377 Json::Value::Members members = value.getMemberNames(); | |
378 | |
379 for (Json::Value::Members::const_iterator | |
380 it = members.begin(); it != members.end(); ++it) | |
381 { | |
382 // Push the index of the cell | |
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383 lua_pushlstring(lua_, it->c_str(), it->size()); |
1051 | 384 |
385 // Push the value of the cell | |
386 PushJson(value[*it]); | |
387 | |
388 // Stores the pair in the table | |
389 lua_rawset(lua_, -3); | |
390 } | |
391 } | |
392 else | |
393 { | |
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394 throw OrthancException(ErrorCode_JsonToLuaTable); |
1051 | 395 } |
396 } | |
397 | |
386 | 398 |
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399 void LuaContext::GetJson(Json::Value& result, |
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400 int top, |
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401 bool keepStrings) |
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402 { |
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403 if (lua_istable(lua_, top)) |
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404 { |
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405 Json::Value tmp = Json::objectValue; |
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406 bool isArray = true; |
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407 size_t size = 0; |
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408 |
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409 // Code adapted from: http://stackoverflow.com/a/6142700/881731 |
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410 |
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411 // Push another reference to the table on top of the stack (so we know |
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412 // where it is, and this function can work for negative, positive and |
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413 // pseudo indices |
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414 lua_pushvalue(lua_, top); |
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415 // stack now contains: -1 => table |
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416 lua_pushnil(lua_); |
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417 // stack now contains: -1 => nil; -2 => table |
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418 while (lua_next(lua_, -2)) |
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419 { |
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420 // stack now contains: -1 => value; -2 => key; -3 => table |
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421 // copy the key so that lua_tostring does not modify the original |
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422 lua_pushvalue(lua_, -2); |
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423 // stack now contains: -1 => key; -2 => value; -3 => key; -4 => table |
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424 std::string key(lua_tostring(lua_, -1)); |
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425 Json::Value v; |
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426 GetJson(v, -2, keepStrings); |
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427 |
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428 tmp[key] = v; |
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429 |
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430 size += 1; |
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431 try |
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432 { |
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433 if (!OnlyContainsDigits(key) || |
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434 boost::lexical_cast<size_t>(key) != size) |
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435 { |
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436 isArray = false; |
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437 } |
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438 } |
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439 catch (boost::bad_lexical_cast&) |
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440 { |
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441 isArray = false; |
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442 } |
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443 |
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444 // pop value + copy of key, leaving original key |
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445 lua_pop(lua_, 2); |
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446 // stack now contains: -1 => key; -2 => table |
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447 } |
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448 // stack now contains: -1 => table (when lua_next returns 0 it pops the key |
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449 // but does not push anything.) |
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450 // Pop table |
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451 lua_pop(lua_, 1); |
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452 |
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453 // Stack is now the same as it was on entry to this function |
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454 |
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455 if (isArray) |
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456 { |
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457 result = Json::arrayValue; |
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458 for (size_t i = 0; i < size; i++) |
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459 { |
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460 result.append(tmp[boost::lexical_cast<std::string>(i + 1)]); |
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461 } |
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462 } |
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463 else |
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464 { |
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465 result = tmp; |
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466 } |
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467 } |
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468 else if (lua_isnil(lua_, top)) |
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469 { |
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470 result = Json::nullValue; |
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471 } |
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472 else if (!keepStrings && |
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473 lua_isboolean(lua_, top)) |
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474 { |
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475 result = lua_toboolean(lua_, top) ? true : false; |
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476 } |
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477 else if (!keepStrings && |
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478 lua_isnumber(lua_, top)) |
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479 { |
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480 // Convert to "int" if truncation does not loose precision |
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481 double value = static_cast<double>(lua_tonumber(lua_, top)); |
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482 int truncated = static_cast<int>(value); |
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483 |
1448
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484 if (std::abs(value - static_cast<double>(truncated)) <= |
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485 std::numeric_limits<double>::epsilon()) |
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486 { |
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487 result = truncated; |
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488 } |
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489 else |
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490 { |
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491 result = value; |
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492 } |
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493 } |
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494 else if (lua_isstring(lua_, top)) |
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495 { |
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496 // Caution: The "lua_isstring()" case must be the last, since |
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497 // Lua can convert most types to strings by default. |
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498 result = std::string(lua_tostring(lua_, top)); |
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499 } |
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500 else |
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501 { |
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502 LOG(WARNING) << "Unsupported Lua type when returning Json"; |
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503 result = Json::nullValue; |
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504 } |
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505 } |
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506 |
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507 |
386 | 508 LuaContext::LuaContext() |
509 { | |
510 lua_ = luaL_newstate(); | |
511 if (!lua_) | |
512 { | |
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513 throw OrthancException(ErrorCode_CannotCreateLua); |
386 | 514 } |
515 | |
516 luaL_openlibs(lua_); | |
517 lua_register(lua_, "print", PrintToLog); | |
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518 lua_register(lua_, "ParseJson", ParseJson); |
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519 lua_register(lua_, "DumpJson", DumpJson); |
1051 | 520 lua_register(lua_, "HttpGet", CallHttpGet); |
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521 lua_register(lua_, "HttpPost", CallHttpPost); |
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522 lua_register(lua_, "HttpPut", CallHttpPut); |
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523 lua_register(lua_, "HttpDelete", CallHttpDelete); |
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524 lua_register(lua_, "SetHttpCredentials", SetHttpCredentials); |
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525 |
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526 SetGlobalVariable("_LuaContext", this); |
386 | 527 } |
528 | |
529 | |
530 LuaContext::~LuaContext() | |
531 { | |
532 lua_close(lua_); | |
533 } | |
534 | |
535 | |
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536 void LuaContext::ExecuteInternal(std::string* output, |
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537 const std::string& command) |
386 | 538 { |
418
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539 log_.clear(); |
386 | 540 int error = (luaL_loadbuffer(lua_, command.c_str(), command.size(), "line") || |
541 lua_pcall(lua_, 0, 0, 0)); | |
542 | |
543 if (error) | |
544 { | |
545 assert(lua_gettop(lua_) >= 1); | |
546 | |
547 std::string description(lua_tostring(lua_, -1)); | |
548 lua_pop(lua_, 1); /* pop error message from the stack */ | |
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549 LOG(ERROR) << "Error while executing Lua script: " << description; |
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550 throw OrthancException(ErrorCode_CannotExecuteLua); |
386 | 551 } |
418
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552 |
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553 if (output != NULL) |
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554 { |
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555 *output = log_; |
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556 } |
386 | 557 } |
558 | |
559 | |
560 void LuaContext::Execute(EmbeddedResources::FileResourceId resource) | |
561 { | |
562 std::string command; | |
563 EmbeddedResources::GetFileResource(command, resource); | |
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564 ExecuteInternal(NULL, command); |
386 | 565 } |
397
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566 |
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567 |
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568 bool LuaContext::IsExistingFunction(const char* name) |
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569 { |
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570 lua_settop(lua_, 0); |
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571 lua_getglobal(lua_, name); |
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572 return lua_type(lua_, -1) == LUA_TFUNCTION; |
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573 } |
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574 |
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575 |
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576 void LuaContext::Execute(Json::Value& output, |
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577 const std::string& command) |
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578 { |
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579 std::string s; |
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580 ExecuteInternal(&s, command); |
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581 |
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582 Json::Reader reader; |
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583 if (!reader.parse(s, output)) |
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584 { |
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585 throw OrthancException(ErrorCode_BadJson); |
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586 } |
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587 } |
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588 |
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589 |
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590 void LuaContext::RegisterFunction(const char* name, |
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591 lua_CFunction func) |
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592 { |
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593 lua_register(lua_, name, func); |
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594 } |
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595 |
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596 |
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597 void LuaContext::SetGlobalVariable(const char* name, |
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598 void* value) |
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599 { |
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600 lua_pushlightuserdata(lua_, value); |
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601 lua_setglobal(lua_, name); |
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602 } |
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603 |
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604 |
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605 const void* LuaContext::GetGlobalVariable(lua_State* state, |
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606 const char* name) |
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607 { |
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608 lua_getglobal(state, name); |
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609 assert(lua_type(state, -1) == LUA_TLIGHTUSERDATA); |
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610 const void* value = lua_topointer(state, -1); |
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611 lua_pop(state, 1); |
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612 return value; |
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613 } |
386 | 614 } |