webmcp: 5229687c7601 framework/cgi-bin/webmcp.lua

webmcp

view framework/cgi-bin/webmcp.lua @ 149:5229687c7601

Removed metatable entries in JSON library module (since they should not be set directly); Added documentation to JSON library

author	jbe
date	Wed Jul 30 22:56:21 2014 +0200 (2014-07-30)
parents	30391b40722f
children	8d7665e0d490

line source

1 #!/usr/bin/env lua

3 _WEBMCP_VERSION = "1.2.6"

5 -- Lua 5.1 compatibility

6 if not table.unpack then

7 table.unpack = unpack

8 end

9 do

10 local old_load = load

11 function load(ld, ...)

12 if type(ld) == "string" then

13 local done = false

14 local func = function()

15 if not done then

16 done = true

17 return ld

18 end

19 end

20 return old_load(func, ...)

21 else

22 return old_load(ld, ...)

23 end

24 end

25 end

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

28 if not WEBMCP_PATH then

29 WEBMCP_PATH = "../"

30 end

31 do

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

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

34 local slib_exts = {}

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

36 slib_exts[ext] = true

37 end

38 local paths = {}

39 for ext in pairs(slib_exts) do

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

41 end

42 for ext in pairs(slib_exts) do

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

44 end

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

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

47 end

49 -- load os extensions for lua

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

51 extos = require 'extos'

53 -- load nihil library

54 nihil = require 'nihil'

56 -- load random generator library

57 multirand = require 'multirand'

59 -- load rocketcgi library and map it to cgi, unless interactive

60 do

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

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

63 cgi = nil

64 else

65 rocketcgi = require 'rocketcgi' -- TODO: no "rocketcgi" alias

66 cgi = rocketcgi

67 end

68 end

70 -- load database access library with object relational mapper

71 mondelefant = require 'mondelefant'

72 mondelefant.connection_prototype.error_objects = true

74 -- load type system "atom"

75 atom = require 'atom'

77 -- load mondelefant atom connector

78 require 'mondelefant_atom_connector'

80 --[[--

81 cloned_table = -- newly generated table

82 table.new(

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

84 )

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

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

89 --]]--

90 function table.new(tbl)

91 new_tbl = {}

92 if tbl then

93 for key, value in pairs(tbl) do

94 new_tbl[key] = value

95 end

96 end

97 return new_tbl

98 end

99 --//--

100

101 --[[--

102 at_exit(

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

104 )

105

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

107 --]]--

108 do

109 local exit_handlers = {}

110 function at_exit(func)

111 table.insert(exit_handlers, func)

112 end

113 function exit(code)

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

115 exit_handlers[i]()

116 end

117 os.exit(code)

118 end

119 end

120 --//--

121

122 --[[--

123 app -- table to store an application state

124

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

126 --]]--

127 app = {}

128 --//--

129

130 --[[--

131 config -- table to store application configuration

132

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

134 --]]--

135 config = {}

136 --//--

137

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

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

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

141 do

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

143 if not app_base then

144 error(

145 "Failed to initialize autoloader " ..

146 "due to unset WEBMCP_APP_BASEPATH environment variable."

147 )

148 end

149 local weakkey_mt = { __mode = "k" }

150 local autoloader_category = setmetatable({}, weakkey_mt)

151 local autoloader_path = setmetatable({}, weakkey_mt)

152 local autoloader_mt = {}

153 local function install_autoloader(self, category, path)

154 autoloader_category[self] = category

155 autoloader_path[self] = path

156 setmetatable(self, autoloader_mt)

157 end

158 local function try_exec(filename)

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

160 if file then

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

162 io.close(file)

163 local func, errmsg = load(filedata, "=" .. filename)

164 if func then

165 func()

166 return true

167 else

168 error(errmsg, 0)

169 end

170 else

171 return false

172 end

173 end

174 local function compose_path_string(base, path, key)

175 return string.gsub(

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

177 )

178 end

179 function autoloader_mt.__index(self, key)

180 local category, base_path, merge_base_path, file_key

181 local merge = false

182 if

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

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

185 then

186 category = "env"

187 base_path = WEBMCP_PATH .. "/env/"

188 merge = true

189 merge_base_path = app_base .. "/env/"

190 file_key = key

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

192 category = "model"

193 base_path = app_base .. "/model/"

194 local first = true

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

196 function(c)

197 if first then

198 first = false

199 return string.lower(c)

200 else

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

202 end

203 end

204 )

205 else

206 return

207 end

208 local required_category = autoloader_category[self]

209 if required_category and required_category ~= category then return end

210 local path = autoloader_path[self]

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

212 local merge_path_string

213 if merge then

214 merge_path_string = compose_path_string(

215 merge_base_path, path, file_key

216 )

217 end

218 local function try_dir(dirname)

219 local dir = io.open(dirname)

220 if dir then

221 io.close(dir)

222 local obj = {}

223 local sub_path = {}

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

225 table.insert(sub_path, file_key)

226 install_autoloader(obj, category, sub_path)

227 rawset(self, key, obj)

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

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

230 return true

231 else

232 return false

233 end

234 end

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

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

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

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

239 else end

240 return rawget(self, key)

241 end

242 install_autoloader(_G, nil, {})

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

244 end

245

246 -- interactive console mode

247 if not cgi then

248 trace.disable() -- avoids memory leakage

249 local config_name = request.get_config_name()

250 if config_name then

251 execute.config(config_name)

252 end

253 return

254 end

255

256 local success, error_info = xpcall(

257 function()

258

259 -- execute configuration file

260 do

261 local config_name = request.get_config_name()

262 if config_name then

263 execute.config(config_name)

264 end

265 end

266

267 -- restore slots if coming from http redirect

268 if cgi.params.tempstore then

269 trace.restore_slots{}

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

271 if blob then slot.restore_all(blob) end

272 end

273

274 local function file_exists(filename)

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

276 if file then

277 io.close(file)

278 return true

279 else

280 return false

281 end

282 end

283

284 if request.is_404() then

285 request.set_status("404 Not Found")

286 if request.get_404_route() then

287 request.forward(request.get_404_route())

288 else

289 error("No 404 page set.")

290 end

291 elseif request.get_action() then

292 trace.request{

293 module = request.get_module(),

294 action = request.get_action()

295 }

296 if

297 request.get_404_route() and

298 not file_exists(

299 encode.action_file_path{

300 module = request.get_module(),

301 action = request.get_action()

302 }

303 )

304 then

305 request.set_status("404 Not Found")

306 request.forward(request.get_404_route())

307 else

308 if cgi.method ~= "POST" then

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

310 cgi.add_header("Allow: POST")

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

312 end

313 local action_status = execute.filtered_action{

314 module = request.get_module(),

315 action = request.get_action(),

316 }

317 if not request.is_rerouted() then

318 local routing_mode, routing_module, routing_view

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

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

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

322 routing_anchor = cgi.params["_webmcp_routing." .. action_status .. ".anchor"]

323 if not (routing_mode or routing_module or routing_view) then

324 action_status = "default"

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

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

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

328 routing_anchor = cgi.params["_webmcp_routing.default.anchor"]

329 end

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

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

332 if routing_mode == "redirect" then

333 local routing_params = {}

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

335 local status, stripped_key = string.match(

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

337 )

338 if status == action_status then

339 routing_params[stripped_key] = value

340 end

341 end

342 request.redirect{

343 module = routing_module,

344 view = routing_view,

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

346 params = routing_params,

347 anchor = routing_anchor

348 }

349 elseif routing_mode == "forward" then

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

351 else

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

353 end

354 end

355 end

356 else

357 -- no action

358 trace.request{

359 module = request.get_module(),

360 view = request.get_view()

361 }

362 if

363 request.get_404_route() and

364 not file_exists(

365 encode.view_file_path{

366 module = request.get_module(),

367 view = request.get_view()

368 }

369 )

370 then

371 request.set_status("404 Not Found")

372 request.forward(request.get_404_route())

373 end

374 end

375

376 if not request.get_redirect_data() then

377 request.process_forward()

378 local view = request.get_view()

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

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

381 end

382 execute.filtered_view{

383 module = request.get_module(),

384 view = view,

385 }

386 end

387

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

389 --if request.get_redirect_data() then

390 -- request.get_absolute_baseurl()

391 --end

392

393 end,

394

395 function(errobj)

396 return {

397 errobj = errobj,

398 stacktrace = string.gsub(

399 debug.traceback('', 2),

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

401 )

402 }

403 end

404 )

405

406 if not success then trace.error{} end

407

408 -- laufzeitermittlung

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

410

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

412

413 local redirect_data = request.get_redirect_data()

414

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

416 if not success then

417 local errobj = error_info.errobj

418 local stacktrace = error_info.stacktrace

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

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

421 end

422 slot.set_layout('system_error')

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

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

425 slot.put(

426 "Database error of class ",

427 encode.html(errobj.code),

428 " occured: ",

429 encode.html(errobj.message),

430 ""

431 )

432 else

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

434 end

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

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

437 slot.put("")

438 end)

439 elseif redirect_data then

440 local redirect_params = {}

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

442 redirect_params[key] = value

443 end

444 local slot_dump = slot.dump_all()

445 if slot_dump ~= "" then

446 redirect_params.tempstore = tempstore.save(slot_dump)

447 end

448 local json_request_slots = request.get_json_request_slots()

449 if json_request_slots then

450 redirect_params["_webmcp_json_slots[]"] = json_request_slots

451 end

452 cgi.redirect(

453 encode.url{

454 base = request.get_absolute_baseurl(),

455 module = redirect_data.module,

456 view = redirect_data.view,

457 id = redirect_data.id,

458 params = redirect_params,

459 anchor = redirect_data.anchor

460 }

461 )

462 cgi.send_data()

463 end

464

465 if not success or not redirect_data then

466

467 local http_status = request.get_status()

468 if http_status then

469 cgi.set_status(http_status)

470 end

471

472 local json_request_slots = request.get_json_request_slots()

473 if json_request_slots then

474 cgi.set_content_type('application/json')

475 local data = {}

476 for idx, slot_ident in ipairs(json_request_slots) do

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

478 end

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

480 else

481 cgi.set_content_type(slot.get_content_type())

482 cgi.send_data(slot.render_layout())

483 end

484 end

485

486 exit()