webmcp
view framework/env/request/handler.lua @ 292:c1b561ee56c1
Enable caching for static content
| author | jbe |
|---|---|
| date | Sun Mar 22 17:12:58 2015 +0100 (2015-03-22) |
| parents | fa3a5bba0067 |
| children | 3181d410437c |
line source
1 --[[--
2 request.handler(
3 http_request, -- HTTP request object
4 close -- boolean indicating whether the server should announce to close the connection
5 )
7 Called by mcp.lua to process an HTTP request. Performs some initializations, calls request.router(), and handles the request.
9 --]]--
11 local function file_exists(filename)
12 local file = io.open(filename, "r")
13 if file then
14 io.close(file)
15 return true
16 else
17 return false
18 end
19 end
21 function request.handler(http_request, close)
22 _G.app = {} -- may be overwritten or modified by request initializers
23 do
24 request._in_progress = true -- NOTE: must be set to true before initializer functions are called
25 for i, func in ipairs(request._initializers) do
26 func()
27 end
28 end
30 request._http_request = http_request
31 local path = http_request.path
32 if path then
33 local relative_baseurl_elements = {}
34 for match in string.gmatch(path, "/") do
35 relative_baseurl_elements[#relative_baseurl_elements+1] = "../"
36 end
37 if #relative_baseurl_elements > 0 then
38 request._relative_baseurl = table.concat(relative_baseurl_elements)
39 else
40 request._relative_baseurl = "./"
41 end
42 else
43 request._relative_baseurl = nil
44 end
45 request._route = request.router() or {}
46 do
47 local post_id = http_request.post_params["_webmcp_id"]
48 if post_id then
49 request._route.id = post_id
50 end
51 end
53 if close then
54 request.add_header("Connection", "close")
55 end
57 local success, error_info = xpcall(
58 function()
60 if request._route.static then
61 local f, errmsg = io.open(WEBMCP_BASE_PATH .. "static/" .. request._route.static, "r")
62 if not f then
63 if request.get_404_route() then
64 request.set_status("404 Not Found")
65 request.forward(request.get_404_route())
66 return
67 else
68 error('Could not open static file "' .. request._route.static .. '": ' .. errmsg)
69 end
70 end
71 local d = assert(f:read("*a"))
72 f:close()
73 slot.put_into("data", d)
74 local filename_extension = string.match(request._route.static, "%.([^.]+)$")
75 slot.set_layout(nil, request._mime_types[filename_extension] or "application/octet-stream")
76 request.allow_caching()
77 return
78 end
80 -- restore slots if coming from http redirect
81 local tempstore_value = http_request.get_params["_tempstore"]
82 if tempstore_value then
83 trace.restore_slots{}
84 local blob = tempstore.pop(tempstore_value)
85 if blob then slot.restore_all(blob) end
86 end
88 if request.get_action() then
89 trace.request{
90 module = request.get_module(),
91 action = request.get_action()
92 }
93 if
94 request.get_404_route() and
95 not file_exists(
96 encode.action_file_path{
97 module = request.get_module(),
98 action = request.get_action()
99 }
100 )
101 then
102 request.set_status("404 Not Found")
103 request.forward(request.get_404_route())
104 else
105 if http_request.method ~= "POST" then
106 request.set_status("405 Method Not Allowed")
107 request.add_header("Allow", "POST")
108 error("Tried to invoke an action with a GET request.")
109 end
110 local action_status = execute.filtered_action{
111 module = request.get_module(),
112 action = request.get_action(),
113 }
114 if not request.is_rerouted() then
115 local routing_mode, routing_module, routing_view, routing_anchor
116 routing_mode = http_request.post_params["_webmcp_routing." .. action_status .. ".mode"]
117 routing_module = http_request.post_params["_webmcp_routing." .. action_status .. ".module"]
118 routing_view = http_request.post_params["_webmcp_routing." .. action_status .. ".view"]
119 routing_anchor = http_request.post_params["_webmcp_routing." .. action_status .. ".anchor"]
120 if not (routing_mode or routing_module or routing_view) then
121 action_status = "default"
122 routing_mode = http_request.post_params["_webmcp_routing.default.mode"]
123 routing_module = http_request.post_params["_webmcp_routing.default.module"]
124 routing_view = http_request.post_params["_webmcp_routing.default.view"]
125 routing_anchor = http_request.post_params["_webmcp_routing.default.anchor"]
126 end
127 assert(routing_module, "Routing information has no module.")
128 assert(routing_view, "Routing information has no view.")
129 if routing_mode == "redirect" then
130 local routing_params = {}
131 for key, value in pairs(request.get_param_strings{ method="POST", include_internal=true }) do
132 local status, stripped_key = string.match(
133 key, "^_webmcp_routing%.([^%.]*)%.params%.(.*)$"
134 )
135 if status == action_status then
136 routing_params[stripped_key] = value
137 end
138 end
139 request.redirect{
140 module = routing_module,
141 view = routing_view,
142 id = http_request.post_params["_webmcp_routing." .. action_status .. ".id"],
143 params = routing_params,
144 anchor = routing_anchor
145 }
146 elseif routing_mode == "forward" then
147 request.forward{ module = routing_module, view = routing_view }
148 else
149 error("Missing or unknown routing mode in request parameters.")
150 end
151 end
152 end
153 else
154 -- no action
155 trace.request{
156 module = request.get_module(),
157 view = request.get_view()
158 }
159 if
160 request.get_404_route() and
161 not file_exists(
162 encode.view_file_path{
163 module = request.get_module(),
164 view = request.get_view()
165 }
166 )
167 then
168 request.set_status("404 Not Found")
169 request.forward(request.get_404_route())
170 end
171 end
173 if not request.get_redirect_data() then
174 request.process_forward()
175 local view = request.get_view()
176 if string.find(view, "^_") then
177 error("Tried to call a private view (prefixed with underscore).")
178 end
179 execute.filtered_view{
180 module = request.get_module(),
181 view = view,
182 }
183 end
185 end,
187 function(errobj)
188 return {
189 errobj = errobj,
190 stacktrace = string.gsub(
191 debug.traceback('', 2),
192 "^\r?\n?stack traceback:\r?\n?", ""
193 )
194 }
195 end
196 )
198 if not success then trace.error{} end
200 -- TODO: extend trace system to generally monitor execution time
201 -- trace.exectime{ real = extos.monotonic_hires_time(), cpu = os.clock() }
203 slot.select('trace', trace.render) -- render trace information
205 local redirect_data = request.get_redirect_data()
207 -- log error and switch to error layout, unless success
208 if not success then
209 local errobj = error_info.errobj
210 local stacktrace = error_info.stacktrace
211 if not request._status then
212 request._status = "500 Internal Server Error"
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 end
267 --//--
269 --[[--
270 app -- table to store an application state
272 'app' is a global table for storing any application state data. It will be reset for every request.
273 --]]--
275 -- Initialized in request.handler(...).
277 --//--