webmcp

annotate framework/env/request/handler.lua @ 321:1fcdd5c6f498

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Updated autodoc comments
author jbe
date Mon Mar 23 20:22:48 2015 +0100 (2015-03-23)
parents e3e2a03f75b2
children d8480a60a07d
rev   line source
jbe@215 1 --[[--
jbe@215 2 request.handler(
jbe@270 3 http_request, -- HTTP request object
jbe@264 4 close -- boolean indicating whether the server should announce to close the connection
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@255 11 local function file_exists(filename)
jbe@255 12 local file = io.open(filename, "r")
jbe@255 13 if file then
jbe@255 14 io.close(file)
jbe@255 15 return true
jbe@255 16 else
jbe@255 17 return false
jbe@255 18 end
jbe@255 19 end
jbe@255 20
jbe@264 21 function request.handler(http_request, close)
jbe@212 22 request._http_request = http_request
jbe@215 23 local path = http_request.path
jbe@215 24 if path then
jbe@221 25 local relative_baseurl_elements = {}
jbe@215 26 for match in string.gmatch(path, "/") do
jbe@221 27 relative_baseurl_elements[#relative_baseurl_elements+1] = "../"
jbe@215 28 end
jbe@280 29 if #relative_baseurl_elements > 0 then
jbe@280 30 request._relative_baseurl = table.concat(relative_baseurl_elements)
jbe@280 31 else
jbe@280 32 request._relative_baseurl = "./"
jbe@280 33 end
jbe@215 34 else
jbe@215 35 request._relative_baseurl = nil
jbe@215 36 end
jbe@241 37 request._route = request.router() or {}
jbe@275 38 do
jbe@275 39 local post_id = http_request.post_params["_webmcp_id"]
jbe@275 40 if post_id then
jbe@275 41 request._route.id = post_id
jbe@275 42 end
jbe@275 43 end
jbe@255 44
jbe@264 45 if close then
jbe@264 46 request.add_header("Connection", "close")
jbe@264 47 end
jbe@264 48
jbe@255 49 local success, error_info = xpcall(
jbe@255 50 function()
jbe@255 51
jbe@255 52 if request._route.static then
jbe@270 53 local f, errmsg = io.open(WEBMCP_BASE_PATH .. "static/" .. request._route.static, "r")
jbe@270 54 if not f then
jbe@270 55 if request.get_404_route() then
jbe@270 56 request.set_status("404 Not Found")
jbe@270 57 request.forward(request.get_404_route())
jbe@270 58 return
jbe@270 59 else
jbe@270 60 error('Could not open static file "' .. request._route.static .. '": ' .. errmsg)
jbe@270 61 end
jbe@270 62 end
jbe@270 63 local d = assert(f:read("*a"))
jbe@255 64 f:close()
jbe@255 65 slot.put_into("data", d)
jbe@270 66 local filename_extension = string.match(request._route.static, "%.([^.]+)$")
jbe@270 67 slot.set_layout(nil, request._mime_types[filename_extension] or "application/octet-stream")
jbe@292 68 request.allow_caching()
jbe@255 69 return
jbe@255 70 end
jbe@255 71
jbe@255 72 -- restore slots if coming from http redirect
jbe@255 73 local tempstore_value = http_request.get_params["_tempstore"]
jbe@255 74 if tempstore_value then
jbe@255 75 trace.restore_slots{}
jbe@255 76 local blob = tempstore.pop(tempstore_value)
jbe@255 77 if blob then slot.restore_all(blob) end
jbe@255 78 end
jbe@255 79
jbe@255 80 if request.get_action() then
jbe@255 81 trace.request{
jbe@255 82 module = request.get_module(),
jbe@255 83 action = request.get_action()
jbe@255 84 }
jbe@255 85 if
jbe@255 86 request.get_404_route() and
jbe@255 87 not file_exists(
jbe@255 88 encode.action_file_path{
jbe@255 89 module = request.get_module(),
jbe@255 90 action = request.get_action()
jbe@255 91 }
jbe@255 92 )
jbe@255 93 then
jbe@255 94 request.set_status("404 Not Found")
jbe@255 95 request.forward(request.get_404_route())
jbe@255 96 else
jbe@255 97 if http_request.method ~= "POST" then
jbe@255 98 request.set_status("405 Method Not Allowed")
jbe@255 99 request.add_header("Allow", "POST")
jbe@255 100 error("Tried to invoke an action with a GET request.")
jbe@255 101 end
jbe@255 102 local action_status = execute.filtered_action{
jbe@255 103 module = request.get_module(),
jbe@255 104 action = request.get_action(),
jbe@255 105 }
jbe@255 106 if not request.is_rerouted() then
jbe@255 107 local routing_mode, routing_module, routing_view, routing_anchor
jbe@255 108 routing_mode = http_request.post_params["_webmcp_routing." .. action_status .. ".mode"]
jbe@255 109 routing_module = http_request.post_params["_webmcp_routing." .. action_status .. ".module"]
jbe@255 110 routing_view = http_request.post_params["_webmcp_routing." .. action_status .. ".view"]
jbe@255 111 routing_anchor = http_request.post_params["_webmcp_routing." .. action_status .. ".anchor"]
jbe@255 112 if not (routing_mode or routing_module or routing_view) then
jbe@255 113 action_status = "default"
jbe@255 114 routing_mode = http_request.post_params["_webmcp_routing.default.mode"]
jbe@255 115 routing_module = http_request.post_params["_webmcp_routing.default.module"]
jbe@255 116 routing_view = http_request.post_params["_webmcp_routing.default.view"]
jbe@255 117 routing_anchor = http_request.post_params["_webmcp_routing.default.anchor"]
jbe@255 118 end
jbe@255 119 assert(routing_module, "Routing information has no module.")
jbe@255 120 assert(routing_view, "Routing information has no view.")
jbe@255 121 if routing_mode == "redirect" then
jbe@255 122 local routing_params = {}
jbe@255 123 for key, value in pairs(request.get_param_strings{ method="POST", include_internal=true }) do
jbe@255 124 local status, stripped_key = string.match(
jbe@255 125 key, "^_webmcp_routing%.([^%.]*)%.params%.(.*)$"
jbe@255 126 )
jbe@255 127 if status == action_status then
jbe@255 128 routing_params[stripped_key] = value
jbe@255 129 end
jbe@255 130 end
jbe@255 131 request.redirect{
jbe@255 132 module = routing_module,
jbe@255 133 view = routing_view,
jbe@255 134 id = http_request.post_params["_webmcp_routing." .. action_status .. ".id"],
jbe@255 135 params = routing_params,
jbe@255 136 anchor = routing_anchor
jbe@255 137 }
jbe@255 138 elseif routing_mode == "forward" then
jbe@255 139 request.forward{ module = routing_module, view = routing_view }
jbe@255 140 else
jbe@255 141 error("Missing or unknown routing mode in request parameters.")
jbe@255 142 end
jbe@255 143 end
jbe@255 144 end
jbe@255 145 else
jbe@255 146 -- no action
jbe@255 147 trace.request{
jbe@255 148 module = request.get_module(),
jbe@255 149 view = request.get_view()
jbe@255 150 }
jbe@255 151 if
jbe@255 152 request.get_404_route() and
jbe@255 153 not file_exists(
jbe@255 154 encode.view_file_path{
jbe@255 155 module = request.get_module(),
jbe@255 156 view = request.get_view()
jbe@255 157 }
jbe@255 158 )
jbe@255 159 then
jbe@255 160 request.set_status("404 Not Found")
jbe@255 161 request.forward(request.get_404_route())
jbe@255 162 end
jbe@255 163 end
jbe@255 164
jbe@255 165 if not request.get_redirect_data() then
jbe@255 166 request.process_forward()
jbe@255 167 local view = request.get_view()
jbe@255 168 if string.find(view, "^_") then
jbe@255 169 error("Tried to call a private view (prefixed with underscore).")
jbe@255 170 end
jbe@255 171 execute.filtered_view{
jbe@255 172 module = request.get_module(),
jbe@255 173 view = view,
jbe@255 174 }
jbe@255 175 end
jbe@255 176
jbe@255 177 end,
jbe@255 178
jbe@255 179 function(errobj)
jbe@255 180 return {
jbe@255 181 errobj = errobj,
jbe@255 182 stacktrace = string.gsub(
jbe@255 183 debug.traceback('', 2),
jbe@255 184 "^\r?\n?stack traceback:\r?\n?", ""
jbe@255 185 )
jbe@255 186 }
jbe@255 187 end
jbe@255 188 )
jbe@255 189
jbe@255 190 if not success then trace.error{} end
jbe@255 191
jbe@255 192 -- TODO: extend trace system to generally monitor execution time
jbe@255 193 -- trace.exectime{ real = extos.monotonic_hires_time(), cpu = os.clock() }
jbe@255 194
jbe@255 195 slot.select('trace', trace.render) -- render trace information
jbe@255 196
jbe@255 197 local redirect_data = request.get_redirect_data()
jbe@255 198
jbe@255 199 -- log error and switch to error layout, unless success
jbe@255 200 if not success then
jbe@255 201 local errobj = error_info.errobj
jbe@255 202 local stacktrace = error_info.stacktrace
jbe@255 203 if not request._status then
jbe@255 204 request._status = "500 Internal Server Error"
jbe@255 205 end
jbe@255 206 slot.set_layout('system_error')
jbe@255 207 slot.select('system_error', function()
jbe@255 208 if getmetatable(errobj) == mondelefant.errorobject_metatable then
jbe@255 209 slot.put(
jbe@255 210 "<p>Database error of class <b>",
jbe@255 211 encode.html(errobj.code),
jbe@255 212 "</b> occured:<br/><b>",
jbe@255 213 encode.html(errobj.message),
jbe@255 214 "</b></p>"
jbe@255 215 )
jbe@255 216 else
jbe@255 217 slot.put("<p><b>", encode.html(tostring(errobj)), "</b></p>")
jbe@255 218 end
jbe@255 219 slot.put("<p>Stack trace follows:<br/>")
jbe@255 220 slot.put(encode.html_newlines(encode.html(stacktrace)))
jbe@255 221 slot.put("</p>")
jbe@255 222 end)
jbe@255 223 elseif redirect_data then
jbe@267 224 redirect_data = table.new(redirect_data)
jbe@267 225 redirect_data.params = table.new(redirect_data.params)
jbe@255 226 local slot_dump = slot.dump_all()
jbe@255 227 if slot_dump ~= "" then
jbe@312 228 redirect_data.params._tempstore = tempstore.save(slot_dump)
jbe@255 229 end
jbe@255 230 http_request:send_status("303 See Other")
jbe@264 231 for i, header in ipairs(request._response_headers) do
jbe@264 232 http_request:send_header(header[1], header[2])
jbe@264 233 end
jbe@267 234 http_request:send_header("Location", encode.url(redirect_data))
jbe@255 235 http_request:finish()
jbe@255 236 end
jbe@255 237
jbe@255 238 if not success or not redirect_data then
jbe@255 239
jbe@255 240 http_request:send_status(request._status or "200 OK")
jbe@255 241 for i, header in ipairs(request._response_headers) do
jbe@255 242 http_request:send_header(header[1], header[2])
jbe@255 243 end
jbe@291 244 if not request._cache_manual then
jbe@291 245 local cache_time = request._cache_time
jbe@291 246 if request._cache and cache_time and cache_time > 0 then
jbe@291 247 http_request:send_header("Cache-Control", "max-age=" .. cache_time)
jbe@291 248 else
jbe@291 249 http_request:send_header("Cache-Control", "no-cache")
jbe@291 250 end
jbe@291 251 end
jbe@255 252 http_request:send_header("Content-Type", slot.get_content_type())
jbe@255 253 http_request:send_data(slot.render_layout())
jbe@255 254 http_request:finish()
jbe@255 255 end
jbe@255 256
jbe@215 257 end

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