Mercurial > hg > orthanc
annotate Core/Lua/LuaContext.cpp @ 1437:02f5a3f5c0a0
access to the REST API from Lua
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Tue, 30 Jun 2015 18:41:33 +0200 |
parents | 6e7e5ed91c2d |
children | af112b7d9cba |
rev | line source |
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386 | 1 /** |
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 |
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 | |
36 #include <glog/logging.h> | |
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37 #include <cassert> |
386 | 38 |
39 extern "C" | |
40 { | |
41 #include <lualib.h> | |
42 #include <lauxlib.h> | |
43 } | |
44 | |
45 namespace Orthanc | |
46 { | |
1051 | 47 LuaContext& LuaContext::GetLuaContext(lua_State *state) |
386 | 48 { |
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49 const void* value = GetGlobalVariable(state, "_LuaContext"); |
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50 assert(value != NULL); |
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51 |
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52 return *const_cast<LuaContext*>(reinterpret_cast<const LuaContext*>(value)); |
1051 | 53 } |
54 | |
55 int LuaContext::PrintToLog(lua_State *state) | |
56 { | |
57 LuaContext& that = GetLuaContext(state); | |
58 | |
386 | 59 // http://medek.wordpress.com/2009/02/03/wrapping-lua-errors-and-print-function/ |
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60 int nArgs = lua_gettop(state); |
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61 lua_getglobal(state, "tostring"); |
386 | 62 |
63 // Make sure you start at 1 *NOT* 0 for arrays in Lua. | |
64 std::string result; | |
65 | |
66 for (int i = 1; i <= nArgs; i++) | |
67 { | |
68 const char *s; | |
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69 lua_pushvalue(state, -1); |
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70 lua_pushvalue(state, i); |
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71 lua_call(state, 1, 1); |
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72 s = lua_tostring(state, -1); |
386 | 73 |
74 if (result.size() > 0) | |
75 result.append(", "); | |
76 | |
77 if (s == NULL) | |
78 result.append("<No conversion to string>"); | |
79 else | |
80 result.append(s); | |
81 | |
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82 lua_pop(state, 1); |
386 | 83 } |
84 | |
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85 LOG(WARNING) << "Lua says: " << result; |
1051 | 86 that.log_.append(result); |
87 that.log_.append("\n"); | |
386 | 88 |
89 return 0; | |
90 } | |
91 | |
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92 |
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93 int LuaContext::ParseJsonString(lua_State *state) |
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94 { |
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95 LuaContext& that = GetLuaContext(state); |
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96 |
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97 int nArgs = lua_gettop(state); |
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98 if (nArgs != 1 || |
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99 !lua_isstring(state, 1)) // Password |
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100 { |
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101 lua_pushnil(state); |
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102 return 1; |
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103 } |
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104 |
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105 const char* str = lua_tostring(state, 1); |
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106 |
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107 Json::Value value; |
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108 Json::Reader reader; |
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109 if (reader.parse(str, str + strlen(str), value)) |
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110 { |
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111 that.PushJson(value); |
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112 } |
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113 else |
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114 { |
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115 lua_pushnil(state); |
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116 } |
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117 |
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118 return 1; |
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119 } |
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120 |
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121 |
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122 int LuaContext::SetHttpCredentials(lua_State *state) |
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123 { |
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124 LuaContext& that = GetLuaContext(state); |
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125 |
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126 // Check the types of the arguments |
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127 int nArgs = lua_gettop(state); |
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128 if (nArgs != 2 || |
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129 !lua_isstring(state, 1) || // Username |
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130 !lua_isstring(state, 2)) // Password |
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131 { |
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132 LOG(ERROR) << "Lua: Bad parameters to SetHttpCredentials()"; |
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133 } |
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134 else |
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135 { |
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136 // Configure the HTTP client |
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137 const char* username = lua_tostring(state, 1); |
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138 const char* password = lua_tostring(state, 2); |
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139 that.httpClient_.SetCredentials(username, password); |
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140 } |
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141 |
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142 return 0; |
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143 } |
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144 |
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145 |
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146 bool LuaContext::AnswerHttpQuery(lua_State* state) |
1051 | 147 { |
148 std::string str; | |
149 | |
150 try | |
151 { | |
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152 httpClient_.Apply(str); |
1051 | 153 } |
154 catch (OrthancException& e) | |
155 { | |
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156 return false; |
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157 } |
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158 |
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159 // Return the result of the HTTP request |
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160 lua_pushstring(state, str.c_str()); |
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161 |
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162 return true; |
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163 } |
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164 |
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165 |
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166 int LuaContext::CallHttpGet(lua_State *state) |
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167 { |
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168 LuaContext& that = GetLuaContext(state); |
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169 |
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170 // Check the types of the arguments |
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171 int nArgs = lua_gettop(state); |
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172 if (nArgs != 1 || !lua_isstring(state, 1)) // URL |
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173 { |
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174 LOG(ERROR) << "Lua: Bad parameters to HttpGet()"; |
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175 lua_pushstring(state, "ERROR"); |
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176 return 1; |
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177 } |
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178 |
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179 // Configure the HTTP client class |
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180 const char* url = lua_tostring(state, 1); |
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181 that.httpClient_.SetMethod(HttpMethod_Get); |
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182 that.httpClient_.SetUrl(url); |
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183 |
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184 // Do the HTTP GET request |
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185 if (!that.AnswerHttpQuery(state)) |
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186 { |
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187 LOG(ERROR) << "Lua: Error in HttpGet() for URL " << url; |
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188 lua_pushstring(state, "ERROR"); |
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189 } |
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190 |
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191 return 1; |
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192 } |
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193 |
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194 |
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195 int LuaContext::CallHttpPostOrPut(lua_State *state, |
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196 HttpMethod method) |
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197 { |
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198 LuaContext& that = GetLuaContext(state); |
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199 |
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200 // Check the types of the arguments |
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201 int nArgs = lua_gettop(state); |
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202 if ((nArgs != 1 && nArgs != 2) || |
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203 !lua_isstring(state, 1) || // URL |
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204 (nArgs >= 2 && !lua_isstring(state, 2))) // Body data |
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205 { |
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206 LOG(ERROR) << "Lua: Bad parameters to HttpPost() or HttpPut()"; |
1051 | 207 lua_pushstring(state, "ERROR"); |
208 return 1; | |
209 } | |
210 | |
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211 // Configure the HTTP client class |
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212 const char* url = lua_tostring(state, 1); |
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213 that.httpClient_.SetMethod(method); |
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214 that.httpClient_.SetUrl(url); |
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215 |
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216 if (nArgs >= 2) |
1051 | 217 { |
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218 that.httpClient_.SetPostData(lua_tostring(state, 2)); |
1051 | 219 } |
220 else | |
221 { | |
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222 that.httpClient_.AccessPostData().clear(); |
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223 } |
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224 |
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225 // Do the HTTP POST/PUT request |
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226 if (!that.AnswerHttpQuery(state)) |
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227 { |
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228 LOG(ERROR) << "Lua: Error in HttpPost() or HttpPut() for URL " << url; |
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229 lua_pushstring(state, "ERROR"); |
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230 } |
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231 |
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232 return 1; |
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233 } |
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234 |
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235 |
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236 int LuaContext::CallHttpPost(lua_State *state) |
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237 { |
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238 return CallHttpPostOrPut(state, HttpMethod_Post); |
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239 } |
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240 |
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241 |
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242 int LuaContext::CallHttpPut(lua_State *state) |
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243 { |
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244 return CallHttpPostOrPut(state, HttpMethod_Put); |
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245 } |
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246 |
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247 |
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248 int LuaContext::CallHttpDelete(lua_State *state) |
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249 { |
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250 LuaContext& that = GetLuaContext(state); |
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251 |
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252 // Check the types of the arguments |
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253 int nArgs = lua_gettop(state); |
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254 if (nArgs != 1 || !lua_isstring(state, 1)) // URL |
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255 { |
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256 LOG(ERROR) << "Lua: Bad parameters to HttpDelete()"; |
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257 lua_pushstring(state, "ERROR"); |
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258 return 1; |
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259 } |
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260 |
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261 // Configure the HTTP client class |
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262 const char* url = lua_tostring(state, 1); |
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263 that.httpClient_.SetMethod(HttpMethod_Delete); |
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264 that.httpClient_.SetUrl(url); |
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265 |
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266 // Do the HTTP DELETE request |
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267 std::string s; |
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268 if (!that.httpClient_.Apply(s)) |
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269 { |
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270 LOG(ERROR) << "Lua: Error in HttpDelete() for URL " << url; |
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271 lua_pushstring(state, "ERROR"); |
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272 } |
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273 else |
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274 { |
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275 lua_pushstring(state, "SUCCESS"); |
1051 | 276 } |
277 | |
278 return 1; | |
279 } | |
280 | |
281 | |
282 void LuaContext::PushJson(const Json::Value& value) | |
283 { | |
284 if (value.isString()) | |
285 { | |
286 lua_pushstring(lua_, value.asCString()); | |
287 } | |
288 else if (value.isDouble()) | |
289 { | |
290 lua_pushnumber(lua_, value.asDouble()); | |
291 } | |
292 else if (value.isInt()) | |
293 { | |
294 lua_pushinteger(lua_, value.asInt()); | |
295 } | |
296 else if (value.isUInt()) | |
297 { | |
298 lua_pushinteger(lua_, value.asUInt()); | |
299 } | |
300 else if (value.isBool()) | |
301 { | |
302 lua_pushboolean(lua_, value.asBool()); | |
303 } | |
304 else if (value.isNull()) | |
305 { | |
306 lua_pushnil(lua_); | |
307 } | |
308 else if (value.isArray()) | |
309 { | |
310 lua_newtable(lua_); | |
311 | |
312 // http://lua-users.org/wiki/SimpleLuaApiExample | |
313 for (Json::Value::ArrayIndex i = 0; i < value.size(); i++) | |
314 { | |
315 // Push the table index (note the "+1" because of Lua conventions) | |
316 lua_pushnumber(lua_, i + 1); | |
317 | |
318 // Push the value of the cell | |
319 PushJson(value[i]); | |
320 | |
321 // Stores the pair in the table | |
322 lua_rawset(lua_, -3); | |
323 } | |
324 } | |
325 else if (value.isObject()) | |
326 { | |
327 lua_newtable(lua_); | |
328 | |
329 Json::Value::Members members = value.getMemberNames(); | |
330 | |
331 for (Json::Value::Members::const_iterator | |
332 it = members.begin(); it != members.end(); ++it) | |
333 { | |
334 // Push the index of the cell | |
335 lua_pushstring(lua_, it->c_str()); | |
336 | |
337 // Push the value of the cell | |
338 PushJson(value[*it]); | |
339 | |
340 // Stores the pair in the table | |
341 lua_rawset(lua_, -3); | |
342 } | |
343 } | |
344 else | |
345 { | |
346 throw LuaException("Unsupported JSON conversion"); | |
347 } | |
348 } | |
349 | |
386 | 350 |
351 LuaContext::LuaContext() | |
352 { | |
353 lua_ = luaL_newstate(); | |
354 if (!lua_) | |
355 { | |
356 throw LuaException("Unable to create the Lua context"); | |
357 } | |
358 | |
359 luaL_openlibs(lua_); | |
360 lua_register(lua_, "print", PrintToLog); | |
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361 lua_register(lua_, "ParseJson", ParseJsonString); |
1051 | 362 lua_register(lua_, "HttpGet", CallHttpGet); |
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363 lua_register(lua_, "HttpPost", CallHttpPost); |
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364 lua_register(lua_, "HttpPut", CallHttpPut); |
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365 lua_register(lua_, "HttpDelete", CallHttpDelete); |
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366 lua_register(lua_, "SetHttpCredentials", SetHttpCredentials); |
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367 |
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368 SetGlobalVariable("_LuaContext", this); |
386 | 369 } |
370 | |
371 | |
372 LuaContext::~LuaContext() | |
373 { | |
374 lua_close(lua_); | |
375 } | |
376 | |
377 | |
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378 void LuaContext::ExecuteInternal(std::string* output, |
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379 const std::string& command) |
386 | 380 { |
418
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381 log_.clear(); |
386 | 382 int error = (luaL_loadbuffer(lua_, command.c_str(), command.size(), "line") || |
383 lua_pcall(lua_, 0, 0, 0)); | |
384 | |
385 if (error) | |
386 { | |
387 assert(lua_gettop(lua_) >= 1); | |
388 | |
389 std::string description(lua_tostring(lua_, -1)); | |
390 lua_pop(lua_, 1); /* pop error message from the stack */ | |
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391 LOG(ERROR) << "Error while executing Lua script: " << description; |
386 | 392 throw LuaException(description); |
393 } | |
418
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394 |
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395 if (output != NULL) |
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396 { |
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397 *output = log_; |
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398 } |
386 | 399 } |
400 | |
401 | |
402 void LuaContext::Execute(EmbeddedResources::FileResourceId resource) | |
403 { | |
404 std::string command; | |
405 EmbeddedResources::GetFileResource(command, resource); | |
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406 ExecuteInternal(NULL, command); |
386 | 407 } |
397
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408 |
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409 |
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410 bool LuaContext::IsExistingFunction(const char* name) |
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411 { |
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412 lua_settop(lua_, 0); |
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413 lua_getglobal(lua_, name); |
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414 return lua_type(lua_, -1) == LUA_TFUNCTION; |
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415 } |
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416 |
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417 |
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418 void LuaContext::Execute(Json::Value& output, |
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419 const std::string& command) |
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420 { |
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421 std::string s; |
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422 ExecuteInternal(&s, command); |
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423 |
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424 Json::Reader reader; |
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425 if (!reader.parse(s, output)) |
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426 { |
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427 throw OrthancException(ErrorCode_BadFileFormat); |
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428 } |
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429 } |
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430 |
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431 |
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432 void LuaContext::RegisterFunction(const char* name, |
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433 lua_CFunction func) |
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434 { |
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435 lua_register(lua_, name, func); |
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436 } |
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437 |
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438 |
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439 void LuaContext::SetGlobalVariable(const char* name, |
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440 void* value) |
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441 { |
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442 lua_pushlightuserdata(lua_, value); |
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443 lua_setglobal(lua_, name); |
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444 } |
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445 |
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446 |
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447 const void* LuaContext::GetGlobalVariable(lua_State* state, |
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448 const char* name) |
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449 { |
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450 lua_getglobal(state, name); |
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451 assert(lua_type(state, -1) == LUA_TLIGHTUSERDATA); |
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452 const void* value = lua_topointer(state, -1); |
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453 lua_pop(state, 1); |
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454 return value; |
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455 } |
386 | 456 } |