webmcp: a54cc7dcabf1 framework/cgi-bin/webmcp.lua

webmcp

view framework/cgi-bin/webmcp.lua @ 65:a54cc7dcabf1

"extos" library calls via "extos." instead of "os."

author	jbe
date	Tue Apr 17 15:20:42 2012 +0200 (2012-04-17)
parents	3d43a5cf17c1
children	ebdc20b7048b

line source

1 #!/usr/bin/env lua

3 _WEBMCP_VERSION = "1.1.4"

5 -- Lua 5.1 compatibility

6 if not table.unpack then

7 table.unpack = unpack

8 end

10 -- include "../lib/" in search path for libraries

11 if not WEBMCP_PATH then

12 WEBMCP_PATH = "../"

13 end

15 do

16 package.path = WEBMCP_PATH .. 'lib/?.lua;' .. package.path

17 -- find out which file name extension shared libraries have

18 local slib_exts = {}

19 for ext in string.gmatch(package.cpath, "%?%.([A-Za-z0-9_-]+)") do

20 slib_exts[ext] = true

21 end

22 local paths = {}

23 for ext in pairs(slib_exts) do

24 paths[#paths+1] = WEBMCP_PATH .. "accelerator/?." .. ext

25 end

26 for ext in pairs(slib_exts) do

27 paths[#paths+1] = WEBMCP_PATH .. "lib/?." .. ext

28 end

29 paths[#paths+1] = package.cpath

30 package.cpath = table.concat(paths, ";")

31 end

33 -- load os extensions for lua

34 -- (should happen as soon as possible due to run time measurement)

35 extos = require 'extos'

37 -- load nihil library

38 nihil = require 'nihil'

40 -- load random generator library

41 multirand = require 'multirand'

43 -- load rocketcgi library and map it to cgi

44 do

45 local option = os.getenv("WEBMCP_INTERACTIVE")

46 if option and option ~= "" and option ~= "0" then

47 cgi = nil

48 else

49 rocketcgi = require 'rocketcgi'

50 cgi = rocketcgi

51 end

52 end

54 -- load database access library with object relational mapper

55 mondelefant = require 'mondelefant'

56 mondelefant.connection_prototype.error_objects = true

58 -- load type system "atom"

59 atom = require 'atom'

61 -- load mondelefant atom connector

62 require 'mondelefant_atom_connector'

64 --[[--

65 cloned_table = -- newly generated table

66 table.new(

67 table_or_nil -- keys of a given table will be copied to the new table

68 )

70 If a table is given, then a cloned table is returned.

71 If nil is given, then a new empty table is returned.

73 --]]--

74 function table.new(tbl)

75 new_tbl = {}

76 if tbl then

77 for key, value in pairs(tbl) do

78 new_tbl[key] = value

79 end

80 end

81 return new_tbl

82 end

83 --//--

85 --[[--

86 at_exit(

87 func -- function to be called before the process is ending

88 )

90 Registers a function to be called before the CGI process is exiting.

91 --]]--

92 do

93 local exit_handlers = {}

94 function at_exit(func)

95 table.insert(exit_handlers, func)

96 end

97 function exit(code)

98 for i = #exit_handlers, 1, -1 do

99 exit_handlers[i]()

100 end

101 os.exit(code)

102 end

103 end

104 --//--

105

106 --[[--

107 app -- table to store an application state

108

109 'app' is a global table for storing any application state data

110 --]]--

111 app = {}

112 --//--

113

114 --[[--

115 config -- table to store application configuration

116

117 'config' is a global table, which can be modified by a config file of an application to modify the behaviour of that application.

118 --]]--

119 config = {}

120 --//--

121

122 -- autoloader system for WebMCP environment "../env/",

123 -- application environment extensions "$WEBMCP_APP_BASE/env/"

124 -- and models "$WEBMCP_APP_BASE/model/"

125 do

126 local app_base = os.getenv("WEBMCP_APP_BASEPATH")

127 if not app_base then

128 error(

129 "Failed to initialize autoloader " ..

130 "due to unset WEBMCP_APP_BASEPATH environment variable."

131 )

132 end

133 local weakkey_mt = { __mode = "k" }

134 local autoloader_category = setmetatable({}, weakkey_mt)

135 local autoloader_path = setmetatable({}, weakkey_mt)

136 local autoloader_mt = {}

137 local function install_autoloader(self, category, path)

138 autoloader_category[self] = category

139 autoloader_path[self] = path

140 setmetatable(self, autoloader_mt)

141 end

142 local function try_exec(filename)

143 local file = io.open(filename, "r")

144 if file then

145 local filedata = file:read("*a")

146 io.close(file)

147 local func, errmsg = loadstring(filedata, "=" .. filename)

148 if func then

149 func()

150 return true

151 else

152 error(errmsg, 0)

153 end

154 else

155 return false

156 end

157 end

158 local function compose_path_string(base, path, key)

159 return string.gsub(

160 base .. table.concat(path, "/") .. "/" .. key, "/+", "/"

161 )

162 end

163 function autoloader_mt.__index(self, key)

164 local category, base_path, merge_base_path, file_key

165 local merge = false

166 if

167 string.find(key, "^[a-z_][A-Za-z0-9_]*$") and

168 not string.find(key, "^__")

169 then

170 category = "env"

171 base_path = WEBMCP_PATH .. "/env/"

172 merge = true

173 merge_base_path = app_base .. "/env/"

174 file_key = key

175 elseif string.find(key, "^[A-Z][A-Za-z0-9]*$") then

176 category = "model"

177 base_path = app_base .. "/model/"

178 local first = true

179 file_key = string.gsub(key, "[A-Z]",

180 function(c)

181 if first then

182 first = false

183 return string.lower(c)

184 else

185 return "_" .. string.lower(c)

186 end

187 end

188 )

189 else

190 return

191 end

192 local required_category = autoloader_category[self]

193 if required_category and required_category ~= category then return end

194 local path = autoloader_path[self]

195 local path_string = compose_path_string(base_path, path, file_key)

196 local merge_path_string

197 if merge then

198 merge_path_string = compose_path_string(

199 merge_base_path, path, file_key

200 )

201 end

202 local function try_dir(dirname)

203 local dir = io.open(dirname)

204 if dir then

205 io.close(dir)

206 local obj = {}

207 local sub_path = {}

208 for i, v in ipairs(path) do sub_path[i] = v end

209 table.insert(sub_path, file_key)

210 install_autoloader(obj, category, sub_path)

211 rawset(self, key, obj)

212 try_exec(path_string .. "/__init.lua")

213 if merge then try_exec(merge_path_string .. "/__init.lua") end

214 return true

215 else

216 return false

217 end

218 end

219 if merge and try_exec(merge_path_string .. ".lua") then

220 elseif merge and try_dir(merge_path_string .. "/") then

221 elseif try_exec(path_string .. ".lua") then

222 elseif try_dir(path_string .. "/") then

223 else end

224 return rawget(self, key)

225 end

226 install_autoloader(_G, nil, {})

227 try_exec(WEBMCP_PATH .. "env/__init.lua")

228 end

229

230 -- interactive console mode

231 if not cgi then

232 local config_name = request.get_config_name()

233 if config_name then

234 execute.config(config_name)

235 end

236 return

237 end

238

239 local success, error_info = xpcall(

240 function()

241

242 -- execute configuration file

243 do

244 local config_name = request.get_config_name()

245 if config_name then

246 execute.config(config_name)

247 end

248 end

249

250 -- restore slots if coming from http redirect

251 if cgi.params.tempstore then

252 trace.restore_slots{}

253 local blob = tempstore.pop(cgi.params.tempstore)

254 if blob then slot.restore_all(blob) end

255 end

256

257 local function file_exists(filename)

258 local file = io.open(filename, "r")

259 if file then

260 io.close(file)

261 return true

262 else

263 return false

264 end

265 end

266

267 if cgi.params["_webmcp_404"] then

268 request.force_absolute_baseurl()

269 request.set_status("404 Not Found")

270 if request.get_404_route() then

271 request.forward(request.get_404_route())

272 else

273 error("No 404 page set.")

274 end

275 elseif request.get_action() then

276 trace.request{

277 module = request.get_module(),

278 action = request.get_action()

279 }

280 if

281 request.get_404_route() and

282 not file_exists(

283 encode.action_file_path{

284 module = request.get_module(),

285 action = request.get_action()

286 }

287 )

288 then

289 request.set_status("404 Not Found")

290 request.forward(request.get_404_route())

291 else

292 if cgi.method ~= "POST" then

293 request.set_status("405 Method Not Allowed")

294 cgi.add_header("Allow: POST")

295 error("Tried to invoke an action with a GET request.")

296 end

297 local action_status = execute.filtered_action{

298 module = request.get_module(),

299 action = request.get_action(),

300 }

301 if not request.is_rerouted() then

302 local routing_mode, routing_module, routing_view

303 routing_mode = cgi.params["_webmcp_routing." .. action_status .. ".mode"]

304 routing_module = cgi.params["_webmcp_routing." .. action_status .. ".module"]

305 routing_view = cgi.params["_webmcp_routing." .. action_status .. ".view"]

306 if not (routing_mode or routing_module or routing_view) then

307 action_status = "default"

308 routing_mode = cgi.params["_webmcp_routing.default.mode"]

309 routing_module = cgi.params["_webmcp_routing.default.module"]

310 routing_view = cgi.params["_webmcp_routing.default.view"]

311 end

312 assert(routing_module, "Routing information has no module.")

313 assert(routing_view, "Routing information has no view.")

314 if routing_mode == "redirect" then

315 local routing_params = {}

316 for key, value in pairs(cgi.params) do

317 local status, stripped_key = string.match(

318 key, "^_webmcp_routing%.([^%.]*)%.params%.(.*)$"

319 )

320 if status == action_status then

321 routing_params[stripped_key] = value

322 end

323 end

324 request.redirect{

325 module = routing_module,

326 view = routing_view,

327 id = cgi.params["_webmcp_routing." .. action_status .. ".id"],

328 params = routing_params

329 }

330 elseif routing_mode == "forward" then

331 request.forward{ module = routing_module, view = routing_view }

332 else

333 error("Missing or unknown routing mode in request parameters.")

334 end

335 end

336 end

337 else

338 -- no action

339 trace.request{

340 module = request.get_module(),

341 view = request.get_view()

342 }

343 if

344 request.get_404_route() and

345 not file_exists(

346 encode.view_file_path{

347 module = request.get_module(),

348 view = request.get_view()

349 }

350 )

351 then

352 request.set_status("404 Not Found")

353 request.forward(request.get_404_route())

354 end

355 end

356

357 if not request.get_redirect_data() then

358 request.process_forward()

359 local view = request.get_view()

360 if string.find(view, "^_") then

361 error("Tried to call a private view (prefixed with underscore).")

362 end

363 execute.filtered_view{

364 module = request.get_module(),

365 view = view,

366 }

367 end

368

369 -- force error due to missing absolute base URL until its too late to display error message

370 --if request.get_redirect_data() then

371 -- request.get_absolute_baseurl()

372 --end

373

374 end,

375

376 function(errobj)

377 return {

378 errobj = errobj,

379 stacktrace = string.gsub(

380 debug.traceback('', 2),

381 "^\r?\n?stack traceback:\r?\n?", ""

382 )

383 }

384 end

385 )

386

387 if not success then trace.error{} end

388

389 -- laufzeitermittlung

390 trace.exectime{ real = extos.monotonic_hires_time(), cpu = os.clock() }

391

392 slot.select('trace', trace.render) -- render trace information

393

394 local redirect_data = request.get_redirect_data()

395

396 -- log error and switch to error layout, unless success

397 if not success then

398 local errobj = error_info.errobj

399 local stacktrace = error_info.stacktrace

400 if not request.get_status() and not request.get_json_request_slots() then

401 request.set_status("500 Internal Server Error")

402 end

403 slot.set_layout('system_error')

404 slot.select('system_error', function()

405 if getmetatable(errobj) == mondelefant.errorobject_metatable then

406 slot.put(

407 "Database error of class ",

408 encode.html(errobj.code),

409 " occured: ",

410 encode.html(errobj.message),

411 ""

412 )

413 else

414 slot.put("", encode.html(tostring(errobj)), "")

415 end

416 slot.put("Stack trace follows: ")

417 slot.put(encode.html_newlines(encode.html(stacktrace)))

418 slot.put("")

419 end)

420 elseif redirect_data then

421 local redirect_params = {}

422 for key, value in pairs(redirect_data.params) do

423 redirect_params[key] = value

424 end

425 local slot_dump = slot.dump_all()

426 if slot_dump ~= "" then

427 redirect_params.tempstore = tempstore.save(slot_dump)

428 end

429 local json_request_slots = request.get_json_request_slots()

430 if json_request_slots then

431 redirect_params["_webmcp_json_slots[]"] = json_request_slots

432 end

433 cgi.redirect(

434 encode.url{

435 base = request.get_absolute_baseurl(),

436 module = redirect_data.module,

437 view = redirect_data.view,

438 id = redirect_data.id,

439 params = redirect_params

440 }

441 )

442 cgi.send_data()

443 end

444

445 if not success or not redirect_data then

446

447 local http_status = request.get_status()

448 if http_status then

449 cgi.set_status(http_status)

450 end

451

452 local json_request_slots = request.get_json_request_slots()

453 if json_request_slots then

454 cgi.set_content_type('application/json')

455 local data = {}

456 for idx, slot_ident in ipairs(json_request_slots) do

457 data[slot_ident] = slot.get_content(slot_ident)

458 end

459 cgi.send_data(encode.json(data))

460 else

461 cgi.set_content_type(slot.get_content_type())

462 cgi.send_data(slot.render_layout())

463 end

464 end

465

466 exit()