webmcp
view framework/env/request/handler.lua @ 327:d8480a60a07d
Discard process after error
| author | jbe |
|---|---|
| date | Tue Mar 24 01:08:32 2015 +0100 (2015-03-24) |
| parents | e3e2a03f75b2 |
| children | 04b0687130d8 |
line source
1 --[[--
2 success = -- false if an error occurred, true otherwise
3 request.handler(
4 http_request, -- HTTP request object
5 close -- boolean indicating whether the server should announce to close the connection
6 )
8 Called by mcp.lua to process an HTTP request. Calls request.router(), and handles the request. Note: request initializers will have to be (automatically) executed before this function is invoked by mcp.lua.
10 --]]--
12 local function file_exists(filename)
13 local file = io.open(filename, "r")
14 if file then
15 io.close(file)
16 return true
17 else
18 return false
19 end
20 end
22 function request.handler(http_request, close)
23 local close_sent = false
24 request._http_request = http_request
25 local path = http_request.path
26 if path then
27 local relative_baseurl_elements = {}
28 for match in string.gmatch(path, "/") do
29 relative_baseurl_elements[#relative_baseurl_elements+1] = "../"
30 end
31 if #relative_baseurl_elements > 0 then
32 request._relative_baseurl = table.concat(relative_baseurl_elements)
33 else
34 request._relative_baseurl = "./"
35 end
36 else
37 request._relative_baseurl = nil
38 end
39 request._route = request.router() or {}
40 do
41 local post_id = http_request.post_params["_webmcp_id"]
42 if post_id then
43 request._route.id = post_id
44 end
45 end
47 if close then
48 request.add_header("Connection", "close")
49 close_sent = true
50 end
52 local success, error_info = xpcall(
53 function()
55 if request._route.static then
56 local f, errmsg = io.open(WEBMCP_BASE_PATH .. "static/" .. request._route.static, "r")
57 if not f then
58 if request.get_404_route() then
59 request.set_status("404 Not Found")
60 request.forward(request.get_404_route())
61 else
62 error('Could not open static file "' .. request._route.static .. '": ' .. errmsg)
63 end
64 else
65 local d = assert(f:read("*a"))
66 f:close()
67 slot.put_into("data", d)
68 local filename_extension = string.match(request._route.static, "%.([^.]+)$")
69 slot.set_layout(nil, request._mime_types[filename_extension] or "application/octet-stream")
70 request.allow_caching()
71 return
72 end
73 end
75 -- restore slots if coming from http redirect
76 do
77 local tempstore_value = http_request.get_params["_tempstore"]
78 if tempstore_value then
79 trace.restore_slots{}
80 local blob = tempstore.pop(tempstore_value)
81 if blob then slot.restore_all(blob) end
82 end
83 end
85 if request.get_action() then
86 trace.request{
87 module = request.get_module(),
88 action = request.get_action()
89 }
90 if
91 request.get_404_route() and
92 not file_exists(
93 encode.action_file_path{
94 module = request.get_module(),
95 action = request.get_action()
96 }
97 )
98 then
99 request.set_status("404 Not Found")
100 request.forward(request.get_404_route())
101 else
102 if http_request.method ~= "POST" then
103 request.set_status("405 Method Not Allowed")
104 request.add_header("Allow", "POST")
105 error("Tried to invoke an action with a GET request.")
106 end
107 local action_status = execute.filtered_action{
108 module = request.get_module(),
109 action = request.get_action(),
110 }
111 if not request.is_rerouted() then
112 local routing_mode, routing_module, routing_view, routing_anchor
113 routing_mode = http_request.post_params["_webmcp_routing." .. action_status .. ".mode"]
114 routing_module = http_request.post_params["_webmcp_routing." .. action_status .. ".module"]
115 routing_view = http_request.post_params["_webmcp_routing." .. action_status .. ".view"]
116 routing_anchor = http_request.post_params["_webmcp_routing." .. action_status .. ".anchor"]
117 if not (routing_mode or routing_module or routing_view) then
118 action_status = "default"
119 routing_mode = http_request.post_params["_webmcp_routing.default.mode"]
120 routing_module = http_request.post_params["_webmcp_routing.default.module"]
121 routing_view = http_request.post_params["_webmcp_routing.default.view"]
122 routing_anchor = http_request.post_params["_webmcp_routing.default.anchor"]
123 end
124 assert(routing_module, "Routing information has no module.")
125 assert(routing_view, "Routing information has no view.")
126 if routing_mode == "redirect" then
127 local routing_params = {}
128 for key, value in pairs(request.get_param_strings{ method="POST", include_internal=true }) do
129 local status, stripped_key = string.match(
130 key, "^_webmcp_routing%.([^%.]*)%.params%.(.*)$"
131 )
132 if status == action_status then
133 routing_params[stripped_key] = value
134 end
135 end
136 request.redirect{
137 module = routing_module,
138 view = routing_view,
139 id = http_request.post_params["_webmcp_routing." .. action_status .. ".id"],
140 params = routing_params,
141 anchor = routing_anchor
142 }
143 elseif routing_mode == "forward" then
144 request.forward{ module = routing_module, view = routing_view }
145 else
146 error("Missing or unknown routing mode in request parameters.")
147 end
148 end
149 end
150 else
151 -- no action
152 trace.request{
153 module = request.get_module(),
154 view = request.get_view()
155 }
156 if
157 request.get_404_route() and
158 not file_exists(
159 encode.view_file_path{
160 module = request.get_module(),
161 view = request.get_view()
162 }
163 )
164 then
165 request.set_status("404 Not Found")
166 request.forward(request.get_404_route())
167 end
168 end
170 if not request.get_redirect_data() then
171 request.process_forward()
172 local view = request.get_view()
173 if string.find(view, "^_") then
174 error("Tried to call a private view (prefixed with underscore).")
175 end
176 execute.filtered_view{
177 module = request.get_module(),
178 view = view,
179 }
180 end
182 end,
184 function(errobj)
185 return {
186 errobj = errobj,
187 stacktrace = string.gsub(
188 debug.traceback('', 2),
189 "^\r?\n?stack traceback:\r?\n?", ""
190 )
191 }
192 end
193 )
195 if not success then trace.error{} end
197 -- TODO: extend trace system to generally monitor execution time
198 -- trace.exectime{ real = extos.monotonic_hires_time(), cpu = os.clock() }
200 slot.select('trace', trace.render) -- render trace information
202 local redirect_data = request.get_redirect_data()
204 -- log error and switch to error layout, unless success
205 if not success then
206 local errobj = error_info.errobj
207 local stacktrace = error_info.stacktrace
208 if not request._status then
209 request._status = "500 Internal Server Error"
210 end
211 if not close_sent then
212 request.add_header("Connection", "close")
213 end
214 slot.set_layout('system_error')
215 slot.select('system_error', function()
216 if getmetatable(errobj) == mondelefant.errorobject_metatable then
217 slot.put(
218 "<p>Database error of class <b>",
219 encode.html(errobj.code),
220 "</b> occured:<br/><b>",
221 encode.html(errobj.message),
222 "</b></p>"
223 )
224 else
225 slot.put("<p><b>", encode.html(tostring(errobj)), "</b></p>")
226 end
227 slot.put("<p>Stack trace follows:<br/>")
228 slot.put(encode.html_newlines(encode.html(stacktrace)))
229 slot.put("</p>")
230 end)
231 elseif redirect_data then
232 redirect_data = table.new(redirect_data)
233 redirect_data.params = table.new(redirect_data.params)
234 local slot_dump = slot.dump_all()
235 if slot_dump ~= "" then
236 redirect_data.params._tempstore = tempstore.save(slot_dump)
237 end
238 http_request:send_status("303 See Other")
239 for i, header in ipairs(request._response_headers) do
240 http_request:send_header(header[1], header[2])
241 end
242 http_request:send_header("Location", encode.url(redirect_data))
243 http_request:finish()
244 end
246 if not success or not redirect_data then
248 http_request:send_status(request._status or "200 OK")
249 for i, header in ipairs(request._response_headers) do
250 http_request:send_header(header[1], header[2])
251 end
252 if not request._cache_manual then
253 local cache_time = request._cache_time
254 if request._cache and cache_time and cache_time > 0 then
255 http_request:send_header("Cache-Control", "max-age=" .. cache_time)
256 else
257 http_request:send_header("Cache-Control", "no-cache")
258 end
259 end
260 http_request:send_header("Content-Type", slot.get_content_type())
261 http_request:send_data(slot.render_layout())
262 http_request:finish()
263 end
265 return success
267 end