webmcp

annotate framework/env/request/handler.lua @ 291:fa3a5bba0067

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Cache control; Added documentation for request.add_header(...)
author jbe
date Sun Mar 22 17:03:01 2015 +0100 (2015-03-22)
parents 81711c529eb2
children c1b561ee56c1
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@255 7 Called by mcp.lua to process an HTTP request. Performs some initializations, calls request.router(), and handles the request.
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@258 22 _G.app = {} -- may be overwritten or modified by request initializers
jbe@255 23 do
jbe@255 24 request._in_progress = true -- NOTE: must be set to true before initializer functions are called
jbe@255 25 for i, func in ipairs(request._initializers) do
jbe@262 26 func()
jbe@255 27 end
jbe@255 28 end
jbe@255 29
jbe@212 30 request._http_request = http_request
jbe@215 31 local path = http_request.path
jbe@215 32 if path then
jbe@221 33 local relative_baseurl_elements = {}
jbe@215 34 for match in string.gmatch(path, "/") do
jbe@221 35 relative_baseurl_elements[#relative_baseurl_elements+1] = "../"
jbe@215 36 end
jbe@280 37 if #relative_baseurl_elements > 0 then
jbe@280 38 request._relative_baseurl = table.concat(relative_baseurl_elements)
jbe@280 39 else
jbe@280 40 request._relative_baseurl = "./"
jbe@280 41 end
jbe@215 42 else
jbe@215 43 request._relative_baseurl = nil
jbe@215 44 end
jbe@241 45 request._route = request.router() or {}
jbe@275 46 do
jbe@275 47 local post_id = http_request.post_params["_webmcp_id"]
jbe@275 48 if post_id then
jbe@275 49 request._route.id = post_id
jbe@275 50 end
jbe@275 51 end
jbe@255 52
jbe@264 53 if close then
jbe@264 54 request.add_header("Connection", "close")
jbe@264 55 end
jbe@264 56
jbe@255 57 local success, error_info = xpcall(
jbe@255 58 function()
jbe@255 59
jbe@255 60 if request._route.static then
jbe@270 61 local f, errmsg = io.open(WEBMCP_BASE_PATH .. "static/" .. request._route.static, "r")
jbe@270 62 if not f then
jbe@270 63 if request.get_404_route() then
jbe@270 64 request.set_status("404 Not Found")
jbe@270 65 request.forward(request.get_404_route())
jbe@270 66 return
jbe@270 67 else
jbe@270 68 error('Could not open static file "' .. request._route.static .. '": ' .. errmsg)
jbe@270 69 end
jbe@270 70 end
jbe@270 71 local d = assert(f:read("*a"))
jbe@255 72 f:close()
jbe@255 73 slot.put_into("data", d)
jbe@270 74 local filename_extension = string.match(request._route.static, "%.([^.]+)$")
jbe@270 75 slot.set_layout(nil, request._mime_types[filename_extension] or "application/octet-stream")
jbe@255 76 return
jbe@255 77 end
jbe@255 78
jbe@255 79 -- restore slots if coming from http redirect
jbe@255 80 local tempstore_value = http_request.get_params["_tempstore"]
jbe@255 81 if tempstore_value then
jbe@255 82 trace.restore_slots{}
jbe@255 83 local blob = tempstore.pop(tempstore_value)
jbe@255 84 if blob then slot.restore_all(blob) end
jbe@255 85 end
jbe@255 86
jbe@255 87 if request.get_action() then
jbe@255 88 trace.request{
jbe@255 89 module = request.get_module(),
jbe@255 90 action = request.get_action()
jbe@255 91 }
jbe@255 92 if
jbe@255 93 request.get_404_route() and
jbe@255 94 not file_exists(
jbe@255 95 encode.action_file_path{
jbe@255 96 module = request.get_module(),
jbe@255 97 action = request.get_action()
jbe@255 98 }
jbe@255 99 )
jbe@255 100 then
jbe@255 101 request.set_status("404 Not Found")
jbe@255 102 request.forward(request.get_404_route())
jbe@255 103 else
jbe@255 104 if http_request.method ~= "POST" then
jbe@255 105 request.set_status("405 Method Not Allowed")
jbe@255 106 request.add_header("Allow", "POST")
jbe@255 107 error("Tried to invoke an action with a GET request.")
jbe@255 108 end
jbe@255 109 local action_status = execute.filtered_action{
jbe@255 110 module = request.get_module(),
jbe@255 111 action = request.get_action(),
jbe@255 112 }
jbe@255 113 if not request.is_rerouted() then
jbe@255 114 local routing_mode, routing_module, routing_view, routing_anchor
jbe@255 115 routing_mode = http_request.post_params["_webmcp_routing." .. action_status .. ".mode"]
jbe@255 116 routing_module = http_request.post_params["_webmcp_routing." .. action_status .. ".module"]
jbe@255 117 routing_view = http_request.post_params["_webmcp_routing." .. action_status .. ".view"]
jbe@255 118 routing_anchor = http_request.post_params["_webmcp_routing." .. action_status .. ".anchor"]
jbe@255 119 if not (routing_mode or routing_module or routing_view) then
jbe@255 120 action_status = "default"
jbe@255 121 routing_mode = http_request.post_params["_webmcp_routing.default.mode"]
jbe@255 122 routing_module = http_request.post_params["_webmcp_routing.default.module"]
jbe@255 123 routing_view = http_request.post_params["_webmcp_routing.default.view"]
jbe@255 124 routing_anchor = http_request.post_params["_webmcp_routing.default.anchor"]
jbe@255 125 end
jbe@255 126 assert(routing_module, "Routing information has no module.")
jbe@255 127 assert(routing_view, "Routing information has no view.")
jbe@255 128 if routing_mode == "redirect" then
jbe@255 129 local routing_params = {}
jbe@255 130 for key, value in pairs(request.get_param_strings{ method="POST", include_internal=true }) do
jbe@255 131 local status, stripped_key = string.match(
jbe@255 132 key, "^_webmcp_routing%.([^%.]*)%.params%.(.*)$"
jbe@255 133 )
jbe@255 134 if status == action_status then
jbe@255 135 routing_params[stripped_key] = value
jbe@255 136 end
jbe@255 137 end
jbe@255 138 request.redirect{
jbe@255 139 module = routing_module,
jbe@255 140 view = routing_view,
jbe@255 141 id = http_request.post_params["_webmcp_routing." .. action_status .. ".id"],
jbe@255 142 params = routing_params,
jbe@255 143 anchor = routing_anchor
jbe@255 144 }
jbe@255 145 elseif routing_mode == "forward" then
jbe@255 146 request.forward{ module = routing_module, view = routing_view }
jbe@255 147 else
jbe@255 148 error("Missing or unknown routing mode in request parameters.")
jbe@255 149 end
jbe@255 150 end
jbe@255 151 end
jbe@255 152 else
jbe@255 153 -- no action
jbe@255 154 trace.request{
jbe@255 155 module = request.get_module(),
jbe@255 156 view = request.get_view()
jbe@255 157 }
jbe@255 158 if
jbe@255 159 request.get_404_route() and
jbe@255 160 not file_exists(
jbe@255 161 encode.view_file_path{
jbe@255 162 module = request.get_module(),
jbe@255 163 view = request.get_view()
jbe@255 164 }
jbe@255 165 )
jbe@255 166 then
jbe@255 167 request.set_status("404 Not Found")
jbe@255 168 request.forward(request.get_404_route())
jbe@255 169 end
jbe@255 170 end
jbe@255 171
jbe@255 172 if not request.get_redirect_data() then
jbe@255 173 request.process_forward()
jbe@255 174 local view = request.get_view()
jbe@255 175 if string.find(view, "^_") then
jbe@255 176 error("Tried to call a private view (prefixed with underscore).")
jbe@255 177 end
jbe@255 178 execute.filtered_view{
jbe@255 179 module = request.get_module(),
jbe@255 180 view = view,
jbe@255 181 }
jbe@255 182 end
jbe@255 183
jbe@255 184 end,
jbe@255 185
jbe@255 186 function(errobj)
jbe@255 187 return {
jbe@255 188 errobj = errobj,
jbe@255 189 stacktrace = string.gsub(
jbe@255 190 debug.traceback('', 2),
jbe@255 191 "^\r?\n?stack traceback:\r?\n?", ""
jbe@255 192 )
jbe@255 193 }
jbe@255 194 end
jbe@255 195 )
jbe@255 196
jbe@255 197 if not success then trace.error{} end
jbe@255 198
jbe@255 199 -- TODO: extend trace system to generally monitor execution time
jbe@255 200 -- trace.exectime{ real = extos.monotonic_hires_time(), cpu = os.clock() }
jbe@255 201
jbe@255 202 slot.select('trace', trace.render) -- render trace information
jbe@255 203
jbe@255 204 local redirect_data = request.get_redirect_data()
jbe@255 205
jbe@255 206 -- log error and switch to error layout, unless success
jbe@255 207 if not success then
jbe@255 208 local errobj = error_info.errobj
jbe@255 209 local stacktrace = error_info.stacktrace
jbe@255 210 if not request._status then
jbe@255 211 request._status = "500 Internal Server Error"
jbe@255 212 end
jbe@255 213 slot.set_layout('system_error')
jbe@255 214 slot.select('system_error', function()
jbe@255 215 if getmetatable(errobj) == mondelefant.errorobject_metatable then
jbe@255 216 slot.put(
jbe@255 217 "<p>Database error of class <b>",
jbe@255 218 encode.html(errobj.code),
jbe@255 219 "</b> occured:<br/><b>",
jbe@255 220 encode.html(errobj.message),
jbe@255 221 "</b></p>"
jbe@255 222 )
jbe@255 223 else
jbe@255 224 slot.put("<p><b>", encode.html(tostring(errobj)), "</b></p>")
jbe@255 225 end
jbe@255 226 slot.put("<p>Stack trace follows:<br/>")
jbe@255 227 slot.put(encode.html_newlines(encode.html(stacktrace)))
jbe@255 228 slot.put("</p>")
jbe@255 229 end)
jbe@255 230 elseif redirect_data then
jbe@267 231 redirect_data = table.new(redirect_data)
jbe@267 232 redirect_data.params = table.new(redirect_data.params)
jbe@255 233 local slot_dump = slot.dump_all()
jbe@255 234 if slot_dump ~= "" then
jbe@267 235 redirect_data.params.tempstore = tempstore.save(slot_dump)
jbe@255 236 end
jbe@255 237 http_request:send_status("303 See Other")
jbe@264 238 for i, header in ipairs(request._response_headers) do
jbe@264 239 http_request:send_header(header[1], header[2])
jbe@264 240 end
jbe@267 241 http_request:send_header("Location", encode.url(redirect_data))
jbe@255 242 http_request:finish()
jbe@255 243 end
jbe@255 244
jbe@255 245 if not success or not redirect_data then
jbe@255 246
jbe@255 247 http_request:send_status(request._status or "200 OK")
jbe@255 248 for i, header in ipairs(request._response_headers) do
jbe@255 249 http_request:send_header(header[1], header[2])
jbe@255 250 end
jbe@291 251 if not request._cache_manual then
jbe@291 252 local cache_time = request._cache_time
jbe@291 253 if request._cache and cache_time and cache_time > 0 then
jbe@291 254 http_request:send_header("Cache-Control", "max-age=" .. cache_time)
jbe@291 255 else
jbe@291 256 http_request:send_header("Cache-Control", "no-cache")
jbe@291 257 end
jbe@291 258 end
jbe@255 259 http_request:send_header("Content-Type", slot.get_content_type())
jbe@255 260 http_request:send_data(slot.render_layout())
jbe@255 261 http_request:finish()
jbe@255 262 end
jbe@255 263
jbe@215 264 end
jbe@258 265
jbe@258 266 --//--
jbe@258 267
jbe@258 268 --[[--
jbe@258 269 app -- table to store an application state
jbe@258 270
jbe@258 271 'app' is a global table for storing any application state data. It will be reset for every request.
jbe@258 272 --]]--
jbe@258 273
jbe@258 274 -- Initialized in request.handler(...).
jbe@258 275
jbe@258 276 --//--

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