webmcp: framework/env/request/handler.lua annotate

webmcp

annotate framework/env/request/handler.lua @ 352:2b5bdf9028fb

Code cleanup and performance improvements regarding 404 check; Deprecated encode.action_file_path{...} and encode.view_file_path{...}

author	jbe
date	Thu Mar 26 16:40:04 2015 +0100 (2015-03-26)
parents	8cf6d927d074
children	545ec2e3eafa

rev	line source
jbe@215	1 --[[--
jbe@327	2 success = -- false if an error occurred, true otherwise
jbe@215	3 request.handler(
jbe@349	4 http_request -- HTTP request object
jbe@215	5 )
jbe@215	6
jbe@316	7 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.
jbe@215	8
jbe@215	9 --]]--
jbe@210	10
jbe@347	11 function request.handler(http_request)
jbe@212	12 request._http_request = http_request
jbe@215	13 local path = http_request.path
jbe@215	14 if path then
jbe@221	15 local relative_baseurl_elements = {}
jbe@215	16 for match in string.gmatch(path, "/") do
jbe@221	17 relative_baseurl_elements[#relative_baseurl_elements+1] = "../"
jbe@215	18 end
jbe@280	19 if #relative_baseurl_elements > 0 then
jbe@280	20 request._relative_baseurl = table.concat(relative_baseurl_elements)
jbe@280	21 else
jbe@280	22 request._relative_baseurl = "./"
jbe@280	23 end
jbe@215	24 else
jbe@215	25 request._relative_baseurl = nil
jbe@215	26 end
jbe@329	27 request._route = request.router()
jbe@275	28 do
jbe@275	29 local post_id = http_request.post_params["_webmcp_id"]
jbe@275	30 if post_id then
jbe@275	31 request._route.id = post_id
jbe@275	32 end
jbe@275	33 end
jbe@255	34
jbe@255	35 local success, error_info = xpcall(
jbe@255	36 function()
jbe@255	37
jbe@329	38 if not request._route then
jbe@329	39 request._route = {}
jbe@329	40 if request.get_404_route() then
jbe@329	41 request.set_status("404 Not Found")
jbe@329	42 request.forward(request.get_404_route())
jbe@329	43 else
jbe@329	44 error("Could not route request URL")
jbe@329	45 end
jbe@329	46 end
jbe@329	47
jbe@255	48 if request._route.static then
jbe@347	49 local filename = WEBMCP_BASE_PATH .. "static/" .. request._route.static
jbe@347	50 -- TODO: move sanitizer from request.default_router(...) to request.handler(...)
jbe@347	51 local fstat, f, errmsg
jbe@347	52 fstat, errmsg = extos.stat(filename)
jbe@347	53 if fstat then
jbe@347	54 if fstat.isdir then
jbe@347	55 errmsg = "Is a directory"
jbe@347	56 elseif not fstat.isreg then
jbe@347	57 errmsg = "Not a regular file"
jbe@347	58 else
jbe@347	59 f, errmsg = io.open(filename, "r")
jbe@347	60 end
jbe@347	61 end
jbe@270	62 if not f then
jbe@328	63 request.set_status("404 Not Found")
jbe@270	64 if request.get_404_route() then
jbe@329	65 request.set_status("404 Not Found")
jbe@270	66 request.forward(request.get_404_route())
jbe@270	67 else
jbe@270	68 error('Could not open static file "' .. request._route.static .. '": ' .. errmsg)
jbe@270	69 end
jbe@327	70 else
jbe@327	71 local d = assert(f:read("*a"))
jbe@327	72 f:close()
jbe@327	73 slot.put_into("data", d)
jbe@327	74 local filename_extension = string.match(request._route.static, "%.([^.]+)$")
jbe@327	75 slot.set_layout(nil, request._mime_types[filename_extension] or "application/octet-stream")
jbe@327	76 request.allow_caching()
jbe@327	77 return
jbe@270	78 end
jbe@255	79 end
jbe@255	80
jbe@255	81 -- restore slots if coming from http redirect
jbe@327	82 do
jbe@327	83 local tempstore_value = http_request.get_params["_tempstore"]
jbe@327	84 if tempstore_value then
jbe@327	85 trace.restore_slots{}
jbe@327	86 local blob = tempstore.pop(tempstore_value)
jbe@327	87 if blob then slot.restore_all(blob) end
jbe@327	88 end
jbe@255	89 end
jbe@255	90
jbe@255	91 if request.get_action() then
jbe@255	92 trace.request{
jbe@255	93 module = request.get_module(),
jbe@255	94 action = request.get_action()
jbe@255	95 }
jbe@255	96 if
jbe@255	97 request.get_404_route() and
jbe@352	98 not execute.action{
jbe@352	99 module = request.get_module(),
jbe@352	100 action = request.get_action(),
jbe@352	101 test_existence = true
jbe@352	102 }
jbe@255	103 then
jbe@255	104 request.set_status("404 Not Found")
jbe@255	105 request.forward(request.get_404_route())
jbe@255	106 else
jbe@255	107 if http_request.method ~= "POST" then
jbe@255	108 request.set_status("405 Method Not Allowed")
jbe@255	109 request.add_header("Allow", "POST")
jbe@255	110 error("Tried to invoke an action with a GET request.")
jbe@255	111 end
jbe@255	112 local action_status = execute.filtered_action{
jbe@255	113 module = request.get_module(),
jbe@255	114 action = request.get_action(),
jbe@255	115 }
jbe@255	116 if not request.is_rerouted() then
jbe@255	117 local routing_mode, routing_module, routing_view, routing_anchor
jbe@255	118 routing_mode = http_request.post_params["_webmcp_routing." .. action_status .. ".mode"]
jbe@255	119 routing_module = http_request.post_params["_webmcp_routing." .. action_status .. ".module"]
jbe@255	120 routing_view = http_request.post_params["_webmcp_routing." .. action_status .. ".view"]
jbe@255	121 routing_anchor = http_request.post_params["_webmcp_routing." .. action_status .. ".anchor"]
jbe@255	122 if not (routing_mode or routing_module or routing_view) then
jbe@255	123 action_status = "default"
jbe@255	124 routing_mode = http_request.post_params["_webmcp_routing.default.mode"]
jbe@255	125 routing_module = http_request.post_params["_webmcp_routing.default.module"]
jbe@255	126 routing_view = http_request.post_params["_webmcp_routing.default.view"]
jbe@255	127 routing_anchor = http_request.post_params["_webmcp_routing.default.anchor"]
jbe@255	128 end
jbe@255	129 assert(routing_module, "Routing information has no module.")
jbe@255	130 assert(routing_view, "Routing information has no view.")
jbe@255	131 if routing_mode == "redirect" then
jbe@255	132 local routing_params = {}
jbe@255	133 for key, value in pairs(request.get_param_strings{ method="POST", include_internal=true }) do
jbe@255	134 local status, stripped_key = string.match(
jbe@255	135 key, "^_webmcp_routing%.([^%.])%.params%.(.)$"
jbe@255	136 )
jbe@255	137 if status == action_status then
jbe@255	138 routing_params[stripped_key] = value
jbe@255	139 end
jbe@255	140 end
jbe@255	141 request.redirect{
jbe@255	142 module = routing_module,
jbe@255	143 view = routing_view,
jbe@255	144 id = http_request.post_params["_webmcp_routing." .. action_status .. ".id"],
jbe@255	145 params = routing_params,
jbe@255	146 anchor = routing_anchor
jbe@255	147 }
jbe@255	148 elseif routing_mode == "forward" then
jbe@255	149 request.forward{ module = routing_module, view = routing_view }
jbe@255	150 else
jbe@255	151 error("Missing or unknown routing mode in request parameters.")
jbe@255	152 end
jbe@255	153 end
jbe@255	154 end
jbe@255	155 else
jbe@255	156 -- no action
jbe@255	157 trace.request{
jbe@255	158 module = request.get_module(),
jbe@255	159 view = request.get_view()
jbe@255	160 }
jbe@255	161 if
jbe@255	162 request.get_404_route() and
jbe@352	163 not execute.view{
jbe@352	164 module = request.get_module(),
jbe@352	165 view = request.get_view(),
jbe@352	166 test_existence = true
jbe@352	167 }
jbe@255	168 then
jbe@255	169 request.set_status("404 Not Found")
jbe@255	170 request.forward(request.get_404_route())
jbe@255	171 end
jbe@255	172 end
jbe@255	173
jbe@255	174 if not request.get_redirect_data() then
jbe@255	175 request.process_forward()
jbe@255	176 local view = request.get_view()
jbe@255	177 if string.find(view, "^_") then
jbe@255	178 error("Tried to call a private view (prefixed with underscore).")
jbe@255	179 end
jbe@255	180 execute.filtered_view{
jbe@255	181 module = request.get_module(),
jbe@255	182 view = view,
jbe@255	183 }
jbe@255	184 end
jbe@255	185
jbe@255	186 end,
jbe@255	187
jbe@255	188 function(errobj)
jbe@255	189 return {
jbe@255	190 errobj = errobj,
jbe@255	191 stacktrace = string.gsub(
jbe@255	192 debug.traceback('', 2),
jbe@255	193 "^\r?\n?stack traceback:\r?\n?", ""
jbe@255	194 )
jbe@255	195 }
jbe@255	196 end
jbe@255	197 )
jbe@255	198
jbe@255	199 if not success then trace.error{} end
jbe@255	200
jbe@255	201 -- TODO: extend trace system to generally monitor execution time
jbe@255	202 -- trace.exectime{ real = extos.monotonic_hires_time(), cpu = os.clock() }
jbe@255	203
jbe@255	204 slot.select('trace', trace.render) -- render trace information
jbe@255	205
jbe@255	206 local redirect_data = request.get_redirect_data()
jbe@255	207
jbe@255	208 -- log error and switch to error layout, unless success
jbe@255	209 if not success then
jbe@255	210 local errobj = error_info.errobj
jbe@255	211 local stacktrace = error_info.stacktrace
jbe@255	212 if not request._status then
jbe@255	213 request._status = "500 Internal Server Error"
jbe@255	214 end
jbe@328	215 http_request:close_after_finish()
jbe@255	216 slot.set_layout('system_error')
jbe@255	217 slot.select('system_error', function()
jbe@255	218 if getmetatable(errobj) == mondelefant.errorobject_metatable then
jbe@255	219 slot.put(
jbe@255	220 "<p>Database error of class <b>",
jbe@255	221 encode.html(errobj.code),
jbe@255	222 "</b> occured:<br/><b>",
jbe@255	223 encode.html(errobj.message),
jbe@255	224 "</b></p>"
jbe@255	225 )
jbe@255	226 else
jbe@255	227 slot.put("<p><b>", encode.html(tostring(errobj)), "</b></p>")
jbe@255	228 end
jbe@255	229 slot.put("<p>Stack trace follows:<br/>")
jbe@255	230 slot.put(encode.html_newlines(encode.html(stacktrace)))
jbe@255	231 slot.put("</p>")
jbe@255	232 end)
jbe@255	233 elseif redirect_data then
jbe@267	234 redirect_data = table.new(redirect_data)
jbe@267	235 redirect_data.params = table.new(redirect_data.params)
jbe@255	236 local slot_dump = slot.dump_all()
jbe@255	237 if slot_dump ~= "" then
jbe@312	238 redirect_data.params._tempstore = tempstore.save(slot_dump)
jbe@255	239 end
jbe@255	240 http_request:send_status("303 See Other")
jbe@264	241 for i, header in ipairs(request._response_headers) do
jbe@264	242 http_request:send_header(header[1], header[2])
jbe@264	243 end
jbe@267	244 http_request:send_header("Location", encode.url(redirect_data))
jbe@255	245 http_request:finish()
jbe@255	246 end
jbe@255	247
jbe@255	248 if not success or not redirect_data then
jbe@255	249
jbe@255	250 http_request:send_status(request._status or "200 OK")
jbe@255	251 for i, header in ipairs(request._response_headers) do
jbe@255	252 http_request:send_header(header[1], header[2])
jbe@255	253 end
jbe@291	254 if not request._cache_manual then
jbe@291	255 local cache_time = request._cache_time
jbe@291	256 if request._cache and cache_time and cache_time > 0 then
jbe@291	257 http_request:send_header("Cache-Control", "max-age=" .. cache_time)
jbe@291	258 else
jbe@291	259 http_request:send_header("Cache-Control", "no-cache")
jbe@291	260 end
jbe@291	261 end
jbe@255	262 http_request:send_header("Content-Type", slot.get_content_type())
jbe@255	263 http_request:send_data(slot.render_layout())
jbe@255	264 http_request:finish()
jbe@255	265 end
jbe@255	266
jbe@327	267 return success
jbe@327	268
jbe@215	269 end