webmcp

annotate framework/env/request/handler.lua @ 258:46f0083889a9

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Initialize global variable 'app' on every request
author jbe
date Sun Mar 15 01:08:00 2015 +0100 (2015-03-15)
parents 9e4be058959d
children c3d539e33710
rev   line source
jbe@215 1 --[[--
jbe@215 2 request.handler(
jbe@215 3 request -- HTTP request object
jbe@215 4 )
jbe@215 5
jbe@255 6 Called by mcp.lua to process an HTTP request. Performs some initializations, calls request.router(), and handles the request.
jbe@215 7
jbe@215 8 --]]--
jbe@210 9
jbe@255 10 local function file_exists(filename)
jbe@255 11 local file = io.open(filename, "r")
jbe@255 12 if file then
jbe@255 13 io.close(file)
jbe@255 14 return true
jbe@255 15 else
jbe@255 16 return false
jbe@255 17 end
jbe@255 18 end
jbe@255 19
jbe@255 20 -- TODO: function incomplete yet
jbe@210 21 function request.handler(http_request)
jbe@258 22 _G.app = {} -- may be overwritten or modified by request initializers
jbe@255 23 do
jbe@255 24 local first = not request._in_progress
jbe@255 25 request._in_progress = true -- NOTE: must be set to true before initializer functions are called
jbe@255 26 for i, func in ipairs(request._initializers) do
jbe@255 27 func(first)
jbe@255 28 end
jbe@255 29 end
jbe@255 30
jbe@212 31 request._http_request = http_request
jbe@215 32 local path = http_request.path
jbe@215 33 if path then
jbe@221 34 local relative_baseurl_elements = {}
jbe@215 35 for match in string.gmatch(path, "/") do
jbe@221 36 relative_baseurl_elements[#relative_baseurl_elements+1] = "../"
jbe@215 37 end
jbe@221 38 request._relative_baseurl = table.concat(relative_baseurl_elements)
jbe@215 39 else
jbe@215 40 request._relative_baseurl = nil
jbe@215 41 end
jbe@241 42 request._route = request.router() or {}
jbe@255 43
jbe@255 44 local success, error_info = xpcall(
jbe@255 45 function()
jbe@255 46
jbe@255 47 if request._route.static then
jbe@255 48 local f = assert(io.open(WEBMCP_BASE_PATH .. "static/" .. request._route.static, "r"))
jbe@255 49 local d = f:read("*a")
jbe@255 50 f:close()
jbe@255 51 slot.put_into("data", d)
jbe@255 52 slot.set_layout(nil, "application/octet-stream") -- TODO
jbe@255 53 return
jbe@255 54 end
jbe@255 55
jbe@255 56 -- restore slots if coming from http redirect
jbe@255 57 local tempstore_value = http_request.get_params["_tempstore"]
jbe@255 58 if tempstore_value then
jbe@255 59 trace.restore_slots{}
jbe@255 60 local blob = tempstore.pop(tempstore_value)
jbe@255 61 if blob then slot.restore_all(blob) end
jbe@255 62 end
jbe@255 63
jbe@255 64 if request.get_action() then
jbe@255 65 trace.request{
jbe@255 66 module = request.get_module(),
jbe@255 67 action = request.get_action()
jbe@255 68 }
jbe@255 69 if
jbe@255 70 request.get_404_route() and
jbe@255 71 not file_exists(
jbe@255 72 encode.action_file_path{
jbe@255 73 module = request.get_module(),
jbe@255 74 action = request.get_action()
jbe@255 75 }
jbe@255 76 )
jbe@255 77 then
jbe@255 78 request.set_status("404 Not Found")
jbe@255 79 request.forward(request.get_404_route())
jbe@255 80 else
jbe@255 81 if http_request.method ~= "POST" then
jbe@255 82 request.set_status("405 Method Not Allowed")
jbe@255 83 request.add_header("Allow", "POST")
jbe@255 84 error("Tried to invoke an action with a GET request.")
jbe@255 85 end
jbe@255 86 local action_status = execute.filtered_action{
jbe@255 87 module = request.get_module(),
jbe@255 88 action = request.get_action(),
jbe@255 89 }
jbe@255 90 if not request.is_rerouted() then
jbe@255 91 local routing_mode, routing_module, routing_view, routing_anchor
jbe@255 92 routing_mode = http_request.post_params["_webmcp_routing." .. action_status .. ".mode"]
jbe@255 93 routing_module = http_request.post_params["_webmcp_routing." .. action_status .. ".module"]
jbe@255 94 routing_view = http_request.post_params["_webmcp_routing." .. action_status .. ".view"]
jbe@255 95 routing_anchor = http_request.post_params["_webmcp_routing." .. action_status .. ".anchor"]
jbe@255 96 if not (routing_mode or routing_module or routing_view) then
jbe@255 97 action_status = "default"
jbe@255 98 routing_mode = http_request.post_params["_webmcp_routing.default.mode"]
jbe@255 99 routing_module = http_request.post_params["_webmcp_routing.default.module"]
jbe@255 100 routing_view = http_request.post_params["_webmcp_routing.default.view"]
jbe@255 101 routing_anchor = http_request.post_params["_webmcp_routing.default.anchor"]
jbe@255 102 end
jbe@255 103 assert(routing_module, "Routing information has no module.")
jbe@255 104 assert(routing_view, "Routing information has no view.")
jbe@255 105 if routing_mode == "redirect" then
jbe@255 106 local routing_params = {}
jbe@255 107 for key, value in pairs(request.get_param_strings{ method="POST", include_internal=true }) do
jbe@255 108 local status, stripped_key = string.match(
jbe@255 109 key, "^_webmcp_routing%.([^%.]*)%.params%.(.*)$"
jbe@255 110 )
jbe@255 111 if status == action_status then
jbe@255 112 routing_params[stripped_key] = value
jbe@255 113 end
jbe@255 114 end
jbe@255 115 request.redirect{
jbe@255 116 module = routing_module,
jbe@255 117 view = routing_view,
jbe@255 118 id = http_request.post_params["_webmcp_routing." .. action_status .. ".id"],
jbe@255 119 params = routing_params,
jbe@255 120 anchor = routing_anchor
jbe@255 121 }
jbe@255 122 elseif routing_mode == "forward" then
jbe@255 123 request.forward{ module = routing_module, view = routing_view }
jbe@255 124 else
jbe@255 125 error("Missing or unknown routing mode in request parameters.")
jbe@255 126 end
jbe@255 127 end
jbe@255 128 end
jbe@255 129 else
jbe@255 130 -- no action
jbe@255 131 trace.request{
jbe@255 132 module = request.get_module(),
jbe@255 133 view = request.get_view()
jbe@255 134 }
jbe@255 135 if
jbe@255 136 request.get_404_route() and
jbe@255 137 not file_exists(
jbe@255 138 encode.view_file_path{
jbe@255 139 module = request.get_module(),
jbe@255 140 view = request.get_view()
jbe@255 141 }
jbe@255 142 )
jbe@255 143 then
jbe@255 144 request.set_status("404 Not Found")
jbe@255 145 request.forward(request.get_404_route())
jbe@255 146 end
jbe@255 147 end
jbe@255 148
jbe@255 149 if not request.get_redirect_data() then
jbe@255 150 request.process_forward()
jbe@255 151 local view = request.get_view()
jbe@255 152 if string.find(view, "^_") then
jbe@255 153 error("Tried to call a private view (prefixed with underscore).")
jbe@255 154 end
jbe@255 155 execute.filtered_view{
jbe@255 156 module = request.get_module(),
jbe@255 157 view = view,
jbe@255 158 }
jbe@255 159 end
jbe@255 160
jbe@255 161 -- force error due to missing absolute base URL until its too late to display error message
jbe@255 162 --if request.get_redirect_data() then
jbe@255 163 -- request.get_absolute_baseurl()
jbe@255 164 --end
jbe@255 165
jbe@255 166 end,
jbe@255 167
jbe@255 168 function(errobj)
jbe@255 169 return {
jbe@255 170 errobj = errobj,
jbe@255 171 stacktrace = string.gsub(
jbe@255 172 debug.traceback('', 2),
jbe@255 173 "^\r?\n?stack traceback:\r?\n?", ""
jbe@255 174 )
jbe@255 175 }
jbe@255 176 end
jbe@255 177 )
jbe@255 178
jbe@255 179 if not success then trace.error{} end
jbe@255 180
jbe@255 181 -- TODO: extend trace system to generally monitor execution time
jbe@255 182 -- trace.exectime{ real = extos.monotonic_hires_time(), cpu = os.clock() }
jbe@255 183
jbe@255 184 slot.select('trace', trace.render) -- render trace information
jbe@255 185
jbe@255 186 local redirect_data = request.get_redirect_data()
jbe@255 187
jbe@255 188 -- log error and switch to error layout, unless success
jbe@255 189 if not success then
jbe@255 190 local errobj = error_info.errobj
jbe@255 191 local stacktrace = error_info.stacktrace
jbe@255 192 if not request._status then
jbe@255 193 request._status = "500 Internal Server Error"
jbe@255 194 end
jbe@255 195 slot.set_layout('system_error')
jbe@255 196 slot.select('system_error', function()
jbe@255 197 if getmetatable(errobj) == mondelefant.errorobject_metatable then
jbe@255 198 slot.put(
jbe@255 199 "<p>Database error of class <b>",
jbe@255 200 encode.html(errobj.code),
jbe@255 201 "</b> occured:<br/><b>",
jbe@255 202 encode.html(errobj.message),
jbe@255 203 "</b></p>"
jbe@255 204 )
jbe@255 205 else
jbe@255 206 slot.put("<p><b>", encode.html(tostring(errobj)), "</b></p>")
jbe@255 207 end
jbe@255 208 slot.put("<p>Stack trace follows:<br/>")
jbe@255 209 slot.put(encode.html_newlines(encode.html(stacktrace)))
jbe@255 210 slot.put("</p>")
jbe@255 211 end)
jbe@255 212 elseif redirect_data then
jbe@255 213 local redirect_params = {}
jbe@255 214 for key, value in pairs(redirect_data.params) do
jbe@255 215 redirect_params[key] = value
jbe@255 216 end
jbe@255 217 local slot_dump = slot.dump_all()
jbe@255 218 if slot_dump ~= "" then
jbe@255 219 redirect_params.tempstore = tempstore.save(slot_dump)
jbe@255 220 end
jbe@255 221 http_request:send_status("303 See Other")
jbe@255 222 http_request:send_header("Connection", "close") -- TODO: extend moonbridge
jbe@255 223 http_request:send_header(
jbe@255 224 "Location",
jbe@255 225 encode.url{
jbe@255 226 base = request.get_absolute_baseurl(),
jbe@255 227 module = redirect_data.module,
jbe@255 228 view = redirect_data.view,
jbe@255 229 id = redirect_data.id,
jbe@255 230 params = redirect_params,
jbe@255 231 anchor = redirect_data.anchor
jbe@255 232 }
jbe@255 233 )
jbe@255 234 http_request:finish()
jbe@255 235 end
jbe@255 236
jbe@255 237 if not success or not redirect_data then
jbe@255 238
jbe@255 239 http_request:send_status(request._status or "200 OK")
jbe@255 240 http_request:send_header("Connection", "close") -- TODO: extend moonbridge
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@255 244 http_request:send_header("Content-Type", slot.get_content_type())
jbe@255 245 http_request:send_data(slot.render_layout())
jbe@255 246 http_request:finish()
jbe@255 247 end
jbe@255 248
jbe@215 249 end
jbe@258 250
jbe@258 251 --//--
jbe@258 252
jbe@258 253 --[[--
jbe@258 254 app -- table to store an application state
jbe@258 255
jbe@258 256 'app' is a global table for storing any application state data. It will be reset for every request.
jbe@258 257 --]]--
jbe@258 258
jbe@258 259 -- Initialized in request.handler(...).
jbe@258 260
jbe@258 261 --//--

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