webmcp

annotate framework/env/request/handler.lua @ 327:d8480a60a07d

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Discard process after error
author jbe
date Tue Mar 24 01:08:32 2015 +0100 (2015-03-24)
parents e3e2a03f75b2
children 04b0687130d8
rev   line source
jbe@215 1 --[[--
jbe@327 2 success = -- false if an error occurred, true otherwise
jbe@215 3 request.handler(
jbe@270 4 http_request, -- HTTP request object
jbe@264 5 close -- boolean indicating whether the server should announce to close the connection
jbe@215 6 )
jbe@215 7
jbe@316 8 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 9
jbe@215 10 --]]--
jbe@210 11
jbe@255 12 local function file_exists(filename)
jbe@255 13 local file = io.open(filename, "r")
jbe@255 14 if file then
jbe@255 15 io.close(file)
jbe@255 16 return true
jbe@255 17 else
jbe@255 18 return false
jbe@255 19 end
jbe@255 20 end
jbe@255 21
jbe@264 22 function request.handler(http_request, close)
jbe@327 23 local close_sent = false
jbe@212 24 request._http_request = http_request
jbe@215 25 local path = http_request.path
jbe@215 26 if path then
jbe@221 27 local relative_baseurl_elements = {}
jbe@215 28 for match in string.gmatch(path, "/") do
jbe@221 29 relative_baseurl_elements[#relative_baseurl_elements+1] = "../"
jbe@215 30 end
jbe@280 31 if #relative_baseurl_elements > 0 then
jbe@280 32 request._relative_baseurl = table.concat(relative_baseurl_elements)
jbe@280 33 else
jbe@280 34 request._relative_baseurl = "./"
jbe@280 35 end
jbe@215 36 else
jbe@215 37 request._relative_baseurl = nil
jbe@215 38 end
jbe@241 39 request._route = request.router() or {}
jbe@275 40 do
jbe@275 41 local post_id = http_request.post_params["_webmcp_id"]
jbe@275 42 if post_id then
jbe@275 43 request._route.id = post_id
jbe@275 44 end
jbe@275 45 end
jbe@255 46
jbe@264 47 if close then
jbe@264 48 request.add_header("Connection", "close")
jbe@327 49 close_sent = true
jbe@264 50 end
jbe@264 51
jbe@255 52 local success, error_info = xpcall(
jbe@255 53 function()
jbe@255 54
jbe@255 55 if request._route.static then
jbe@270 56 local f, errmsg = io.open(WEBMCP_BASE_PATH .. "static/" .. request._route.static, "r")
jbe@270 57 if not f then
jbe@270 58 if request.get_404_route() then
jbe@270 59 request.set_status("404 Not Found")
jbe@270 60 request.forward(request.get_404_route())
jbe@270 61 else
jbe@270 62 error('Could not open static file "' .. request._route.static .. '": ' .. errmsg)
jbe@270 63 end
jbe@327 64 else
jbe@327 65 local d = assert(f:read("*a"))
jbe@327 66 f:close()
jbe@327 67 slot.put_into("data", d)
jbe@327 68 local filename_extension = string.match(request._route.static, "%.([^.]+)$")
jbe@327 69 slot.set_layout(nil, request._mime_types[filename_extension] or "application/octet-stream")
jbe@327 70 request.allow_caching()
jbe@327 71 return
jbe@270 72 end
jbe@255 73 end
jbe@255 74
jbe@255 75 -- restore slots if coming from http redirect
jbe@327 76 do
jbe@327 77 local tempstore_value = http_request.get_params["_tempstore"]
jbe@327 78 if tempstore_value then
jbe@327 79 trace.restore_slots{}
jbe@327 80 local blob = tempstore.pop(tempstore_value)
jbe@327 81 if blob then slot.restore_all(blob) end
jbe@327 82 end
jbe@255 83 end
jbe@255 84
jbe@255 85 if request.get_action() then
jbe@255 86 trace.request{
jbe@255 87 module = request.get_module(),
jbe@255 88 action = request.get_action()
jbe@255 89 }
jbe@255 90 if
jbe@255 91 request.get_404_route() and
jbe@255 92 not file_exists(
jbe@255 93 encode.action_file_path{
jbe@255 94 module = request.get_module(),
jbe@255 95 action = request.get_action()
jbe@255 96 }
jbe@255 97 )
jbe@255 98 then
jbe@255 99 request.set_status("404 Not Found")
jbe@255 100 request.forward(request.get_404_route())
jbe@255 101 else
jbe@255 102 if http_request.method ~= "POST" then
jbe@255 103 request.set_status("405 Method Not Allowed")
jbe@255 104 request.add_header("Allow", "POST")
jbe@255 105 error("Tried to invoke an action with a GET request.")
jbe@255 106 end
jbe@255 107 local action_status = execute.filtered_action{
jbe@255 108 module = request.get_module(),
jbe@255 109 action = request.get_action(),
jbe@255 110 }
jbe@255 111 if not request.is_rerouted() then
jbe@255 112 local routing_mode, routing_module, routing_view, routing_anchor
jbe@255 113 routing_mode = http_request.post_params["_webmcp_routing." .. action_status .. ".mode"]
jbe@255 114 routing_module = http_request.post_params["_webmcp_routing." .. action_status .. ".module"]
jbe@255 115 routing_view = http_request.post_params["_webmcp_routing." .. action_status .. ".view"]
jbe@255 116 routing_anchor = http_request.post_params["_webmcp_routing." .. action_status .. ".anchor"]
jbe@255 117 if not (routing_mode or routing_module or routing_view) then
jbe@255 118 action_status = "default"
jbe@255 119 routing_mode = http_request.post_params["_webmcp_routing.default.mode"]
jbe@255 120 routing_module = http_request.post_params["_webmcp_routing.default.module"]
jbe@255 121 routing_view = http_request.post_params["_webmcp_routing.default.view"]
jbe@255 122 routing_anchor = http_request.post_params["_webmcp_routing.default.anchor"]
jbe@255 123 end
jbe@255 124 assert(routing_module, "Routing information has no module.")
jbe@255 125 assert(routing_view, "Routing information has no view.")
jbe@255 126 if routing_mode == "redirect" then
jbe@255 127 local routing_params = {}
jbe@255 128 for key, value in pairs(request.get_param_strings{ method="POST", include_internal=true }) do
jbe@255 129 local status, stripped_key = string.match(
jbe@255 130 key, "^_webmcp_routing%.([^%.]*)%.params%.(.*)$"
jbe@255 131 )
jbe@255 132 if status == action_status then
jbe@255 133 routing_params[stripped_key] = value
jbe@255 134 end
jbe@255 135 end
jbe@255 136 request.redirect{
jbe@255 137 module = routing_module,
jbe@255 138 view = routing_view,
jbe@255 139 id = http_request.post_params["_webmcp_routing." .. action_status .. ".id"],
jbe@255 140 params = routing_params,
jbe@255 141 anchor = routing_anchor
jbe@255 142 }
jbe@255 143 elseif routing_mode == "forward" then
jbe@255 144 request.forward{ module = routing_module, view = routing_view }
jbe@255 145 else
jbe@255 146 error("Missing or unknown routing mode in request parameters.")
jbe@255 147 end
jbe@255 148 end
jbe@255 149 end
jbe@255 150 else
jbe@255 151 -- no action
jbe@255 152 trace.request{
jbe@255 153 module = request.get_module(),
jbe@255 154 view = request.get_view()
jbe@255 155 }
jbe@255 156 if
jbe@255 157 request.get_404_route() and
jbe@255 158 not file_exists(
jbe@255 159 encode.view_file_path{
jbe@255 160 module = request.get_module(),
jbe@255 161 view = request.get_view()
jbe@255 162 }
jbe@255 163 )
jbe@255 164 then
jbe@255 165 request.set_status("404 Not Found")
jbe@255 166 request.forward(request.get_404_route())
jbe@255 167 end
jbe@255 168 end
jbe@255 169
jbe@255 170 if not request.get_redirect_data() then
jbe@255 171 request.process_forward()
jbe@255 172 local view = request.get_view()
jbe@255 173 if string.find(view, "^_") then
jbe@255 174 error("Tried to call a private view (prefixed with underscore).")
jbe@255 175 end
jbe@255 176 execute.filtered_view{
jbe@255 177 module = request.get_module(),
jbe@255 178 view = view,
jbe@255 179 }
jbe@255 180 end
jbe@255 181
jbe@255 182 end,
jbe@255 183
jbe@255 184 function(errobj)
jbe@255 185 return {
jbe@255 186 errobj = errobj,
jbe@255 187 stacktrace = string.gsub(
jbe@255 188 debug.traceback('', 2),
jbe@255 189 "^\r?\n?stack traceback:\r?\n?", ""
jbe@255 190 )
jbe@255 191 }
jbe@255 192 end
jbe@255 193 )
jbe@255 194
jbe@255 195 if not success then trace.error{} end
jbe@255 196
jbe@255 197 -- TODO: extend trace system to generally monitor execution time
jbe@255 198 -- trace.exectime{ real = extos.monotonic_hires_time(), cpu = os.clock() }
jbe@255 199
jbe@255 200 slot.select('trace', trace.render) -- render trace information
jbe@255 201
jbe@255 202 local redirect_data = request.get_redirect_data()
jbe@255 203
jbe@255 204 -- log error and switch to error layout, unless success
jbe@255 205 if not success then
jbe@255 206 local errobj = error_info.errobj
jbe@255 207 local stacktrace = error_info.stacktrace
jbe@255 208 if not request._status then
jbe@255 209 request._status = "500 Internal Server Error"
jbe@255 210 end
jbe@327 211 if not close_sent then
jbe@327 212 request.add_header("Connection", "close")
jbe@327 213 end
jbe@255 214 slot.set_layout('system_error')
jbe@255 215 slot.select('system_error', function()
jbe@255 216 if getmetatable(errobj) == mondelefant.errorobject_metatable then
jbe@255 217 slot.put(
jbe@255 218 "<p>Database error of class <b>",
jbe@255 219 encode.html(errobj.code),
jbe@255 220 "</b> occured:<br/><b>",
jbe@255 221 encode.html(errobj.message),
jbe@255 222 "</b></p>"
jbe@255 223 )
jbe@255 224 else
jbe@255 225 slot.put("<p><b>", encode.html(tostring(errobj)), "</b></p>")
jbe@255 226 end
jbe@255 227 slot.put("<p>Stack trace follows:<br/>")
jbe@255 228 slot.put(encode.html_newlines(encode.html(stacktrace)))
jbe@255 229 slot.put("</p>")
jbe@255 230 end)
jbe@255 231 elseif redirect_data then
jbe@267 232 redirect_data = table.new(redirect_data)
jbe@267 233 redirect_data.params = table.new(redirect_data.params)
jbe@255 234 local slot_dump = slot.dump_all()
jbe@255 235 if slot_dump ~= "" then
jbe@312 236 redirect_data.params._tempstore = tempstore.save(slot_dump)
jbe@255 237 end
jbe@255 238 http_request:send_status("303 See Other")
jbe@264 239 for i, header in ipairs(request._response_headers) do
jbe@264 240 http_request:send_header(header[1], header[2])
jbe@264 241 end
jbe@267 242 http_request:send_header("Location", encode.url(redirect_data))
jbe@255 243 http_request:finish()
jbe@255 244 end
jbe@255 245
jbe@255 246 if not success or not redirect_data then
jbe@255 247
jbe@255 248 http_request:send_status(request._status or "200 OK")
jbe@255 249 for i, header in ipairs(request._response_headers) do
jbe@255 250 http_request:send_header(header[1], header[2])
jbe@255 251 end
jbe@291 252 if not request._cache_manual then
jbe@291 253 local cache_time = request._cache_time
jbe@291 254 if request._cache and cache_time and cache_time > 0 then
jbe@291 255 http_request:send_header("Cache-Control", "max-age=" .. cache_time)
jbe@291 256 else
jbe@291 257 http_request:send_header("Cache-Control", "no-cache")
jbe@291 258 end
jbe@291 259 end
jbe@255 260 http_request:send_header("Content-Type", slot.get_content_type())
jbe@255 261 http_request:send_data(slot.render_layout())
jbe@255 262 http_request:finish()
jbe@255 263 end
jbe@255 264
jbe@327 265 return success
jbe@327 266
jbe@215 267 end

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