webmcp
view framework/env/request/handler.lua @ 258:46f0083889a9
Initialize global variable 'app' on every request
| author | jbe |
|---|---|
| date | Sun Mar 15 01:08:00 2015 +0100 (2015-03-15) |
| parents | 9e4be058959d |
| children | c3d539e33710 |
line source
1 --[[--
2 request.handler(
3 request -- HTTP request object
4 )
6 Called by mcp.lua to process an HTTP request. Performs some initializations, calls request.router(), and handles the request.
8 --]]--
10 local function file_exists(filename)
11 local file = io.open(filename, "r")
12 if file then
13 io.close(file)
14 return true
15 else
16 return false
17 end
18 end
20 -- TODO: function incomplete yet
21 function request.handler(http_request)
22 _G.app = {} -- may be overwritten or modified by request initializers
23 do
24 local first = not request._in_progress
25 request._in_progress = true -- NOTE: must be set to true before initializer functions are called
26 for i, func in ipairs(request._initializers) do
27 func(first)
28 end
29 end
31 request._http_request = http_request
32 local path = http_request.path
33 if path then
34 local relative_baseurl_elements = {}
35 for match in string.gmatch(path, "/") do
36 relative_baseurl_elements[#relative_baseurl_elements+1] = "../"
37 end
38 request._relative_baseurl = table.concat(relative_baseurl_elements)
39 else
40 request._relative_baseurl = nil
41 end
42 request._route = request.router() or {}
44 local success, error_info = xpcall(
45 function()
47 if request._route.static then
48 local f = assert(io.open(WEBMCP_BASE_PATH .. "static/" .. request._route.static, "r"))
49 local d = f:read("*a")
50 f:close()
51 slot.put_into("data", d)
52 slot.set_layout(nil, "application/octet-stream") -- TODO
53 return
54 end
56 -- restore slots if coming from http redirect
57 local tempstore_value = http_request.get_params["_tempstore"]
58 if tempstore_value then
59 trace.restore_slots{}
60 local blob = tempstore.pop(tempstore_value)
61 if blob then slot.restore_all(blob) end
62 end
64 if request.get_action() then
65 trace.request{
66 module = request.get_module(),
67 action = request.get_action()
68 }
69 if
70 request.get_404_route() and
71 not file_exists(
72 encode.action_file_path{
73 module = request.get_module(),
74 action = request.get_action()
75 }
76 )
77 then
78 request.set_status("404 Not Found")
79 request.forward(request.get_404_route())
80 else
81 if http_request.method ~= "POST" then
82 request.set_status("405 Method Not Allowed")
83 request.add_header("Allow", "POST")
84 error("Tried to invoke an action with a GET request.")
85 end
86 local action_status = execute.filtered_action{
87 module = request.get_module(),
88 action = request.get_action(),
89 }
90 if not request.is_rerouted() then
91 local routing_mode, routing_module, routing_view, routing_anchor
92 routing_mode = http_request.post_params["_webmcp_routing." .. action_status .. ".mode"]
93 routing_module = http_request.post_params["_webmcp_routing." .. action_status .. ".module"]
94 routing_view = http_request.post_params["_webmcp_routing." .. action_status .. ".view"]
95 routing_anchor = http_request.post_params["_webmcp_routing." .. action_status .. ".anchor"]
96 if not (routing_mode or routing_module or routing_view) then
97 action_status = "default"
98 routing_mode = http_request.post_params["_webmcp_routing.default.mode"]
99 routing_module = http_request.post_params["_webmcp_routing.default.module"]
100 routing_view = http_request.post_params["_webmcp_routing.default.view"]
101 routing_anchor = http_request.post_params["_webmcp_routing.default.anchor"]
102 end
103 assert(routing_module, "Routing information has no module.")
104 assert(routing_view, "Routing information has no view.")
105 if routing_mode == "redirect" then
106 local routing_params = {}
107 for key, value in pairs(request.get_param_strings{ method="POST", include_internal=true }) do
108 local status, stripped_key = string.match(
109 key, "^_webmcp_routing%.([^%.]*)%.params%.(.*)$"
110 )
111 if status == action_status then
112 routing_params[stripped_key] = value
113 end
114 end
115 request.redirect{
116 module = routing_module,
117 view = routing_view,
118 id = http_request.post_params["_webmcp_routing." .. action_status .. ".id"],
119 params = routing_params,
120 anchor = routing_anchor
121 }
122 elseif routing_mode == "forward" then
123 request.forward{ module = routing_module, view = routing_view }
124 else
125 error("Missing or unknown routing mode in request parameters.")
126 end
127 end
128 end
129 else
130 -- no action
131 trace.request{
132 module = request.get_module(),
133 view = request.get_view()
134 }
135 if
136 request.get_404_route() and
137 not file_exists(
138 encode.view_file_path{
139 module = request.get_module(),
140 view = request.get_view()
141 }
142 )
143 then
144 request.set_status("404 Not Found")
145 request.forward(request.get_404_route())
146 end
147 end
149 if not request.get_redirect_data() then
150 request.process_forward()
151 local view = request.get_view()
152 if string.find(view, "^_") then
153 error("Tried to call a private view (prefixed with underscore).")
154 end
155 execute.filtered_view{
156 module = request.get_module(),
157 view = view,
158 }
159 end
161 -- force error due to missing absolute base URL until its too late to display error message
162 --if request.get_redirect_data() then
163 -- request.get_absolute_baseurl()
164 --end
166 end,
168 function(errobj)
169 return {
170 errobj = errobj,
171 stacktrace = string.gsub(
172 debug.traceback('', 2),
173 "^\r?\n?stack traceback:\r?\n?", ""
174 )
175 }
176 end
177 )
179 if not success then trace.error{} end
181 -- TODO: extend trace system to generally monitor execution time
182 -- trace.exectime{ real = extos.monotonic_hires_time(), cpu = os.clock() }
184 slot.select('trace', trace.render) -- render trace information
186 local redirect_data = request.get_redirect_data()
188 -- log error and switch to error layout, unless success
189 if not success then
190 local errobj = error_info.errobj
191 local stacktrace = error_info.stacktrace
192 if not request._status then
193 request._status = "500 Internal Server Error"
194 end
195 slot.set_layout('system_error')
196 slot.select('system_error', function()
197 if getmetatable(errobj) == mondelefant.errorobject_metatable then
198 slot.put(
199 "<p>Database error of class <b>",
200 encode.html(errobj.code),
201 "</b> occured:<br/><b>",
202 encode.html(errobj.message),
203 "</b></p>"
204 )
205 else
206 slot.put("<p><b>", encode.html(tostring(errobj)), "</b></p>")
207 end
208 slot.put("<p>Stack trace follows:<br/>")
209 slot.put(encode.html_newlines(encode.html(stacktrace)))
210 slot.put("</p>")
211 end)
212 elseif redirect_data then
213 local redirect_params = {}
214 for key, value in pairs(redirect_data.params) do
215 redirect_params[key] = value
216 end
217 local slot_dump = slot.dump_all()
218 if slot_dump ~= "" then
219 redirect_params.tempstore = tempstore.save(slot_dump)
220 end
221 http_request:send_status("303 See Other")
222 http_request:send_header("Connection", "close") -- TODO: extend moonbridge
223 http_request:send_header(
224 "Location",
225 encode.url{
226 base = request.get_absolute_baseurl(),
227 module = redirect_data.module,
228 view = redirect_data.view,
229 id = redirect_data.id,
230 params = redirect_params,
231 anchor = redirect_data.anchor
232 }
233 )
234 http_request:finish()
235 end
237 if not success or not redirect_data then
239 http_request:send_status(request._status or "200 OK")
240 http_request:send_header("Connection", "close") -- TODO: extend moonbridge
241 for i, header in ipairs(request._response_headers) do
242 http_request:send_header(header[1], header[2])
243 end
244 http_request:send_header("Content-Type", slot.get_content_type())
245 http_request:send_data(slot.render_layout())
246 http_request:finish()
247 end
249 end
251 --//--
253 --[[--
254 app -- table to store an application state
256 'app' is a global table for storing any application state data. It will be reset for every request.
257 --]]--
259 -- Initialized in request.handler(...).
261 --//--