net/http/server.lua

   1
   2 local t_insert, t_remove, t_concat = table.insert, table.remove, table.concat;
   3 local parser_new = require "net.http.parser".new;
   4 local events = require "util.events".new();
   5 local addserver = require "net.server".addserver;
   6 local log = require "util.logger".init("http.server");
   7 local os_date = os.date;
   8 local pairs = pairs;
   9 local s_upper = string.upper;
  10 local setmetatable = setmetatable;
  11 local xpcall = xpcall;
  12 local debug = debug;
  13 local tostring = tostring;
  14 local codes = require "net.http.codes";
  15 local _G = _G;
  16 local legacy_httpserver = require "net.httpserver";
  17
  18 local _M = {};
  19
  20 local sessions = {};
  21 local handlers = {};
  22
  23 local listener = {};
  24
  25 local function is_wildcard_event(event)
  26         return event:sub(-2, -1) == "/*";
  27 end
  28 local function is_wildcard_match(wildcard_event, event)
  29         return wildcard_event:sub(1, -2) == event:sub(1, #wildcard_event-1);
  30 end
  31
  32 local event_map = events._event_map;
  33 setmetatable(events._handlers, {
  34         __index = function (handlers, curr_event)
  35                 if is_wildcard_event(curr_event) then return; end -- Wildcard events cannot be fired
  36                 -- Find all handlers that could match this event, sort them
  37                 -- and then put the array into handlers[curr_event] (and return it)
  38                 local matching_handlers_set = {};
  39                 local handlers_array = {};
  40                 for event, handlers_set in pairs(event_map) do
  41                         if event == curr_event or
  42                         is_wildcard_event(event) and is_wildcard_match(event, curr_event) then
  43                                 for handler, priority in pairs(handlers_set) do
  44                                         matching_handlers_set[handler] = { (select(2, event:gsub("/", "%1"))), is_wildcard_event(event) and 0 or 1, priority };
  45                                         table.insert(handlers_array, handler);
  46                                 end
  47                         end
  48                 end
  49                 if #handlers_array == 0 then return; end
  50                 table.sort(handlers_array, function(b, a)
  51                         local a_score, b_score = matching_handlers_set[a], matching_handlers_set[b];
  52                         for i = 1, #a_score do
  53                                 if a_score[i] ~= b_score[i] then -- If equal, compare next score value
  54                                         return a_score[i] < b_score[i];
  55                                 end
  56                         end
  57                         return false;
  58                 end);
  59                 handlers[curr_event] = handlers_array;
  60                 return handlers_array;
  61         end;
  62         __newindex = function (handlers, curr_event, handlers_array)
  63                 if handlers_array == nil
  64                 and is_wildcard_event(curr_event) then
  65                         -- Invalidate all matching
  66                         for event in pairs(handlers) do
  67                                 if is_wildcard_match(curr_event, event) then
  68                                         handlers[event] = nil;
  69                                 end
  70                         end
  71                 end
  72         end;
  73 });
  74
  75 local handle_request;
  76 local _1, _2, _3;
  77 local function _handle_request() return handle_request(_1, _2, _3); end
  78
  79 local last_err;
  80 local function _traceback_handler(err) last_err = err; log("error", "Traceback[http]: %s: %s", tostring(err), debug.traceback()); end
  81 events.add_handler("http-error", function (error)
  82         return "Error processing request: "..codes[error.code]..". Check your error log for more information.";
  83 end, -1);
  84
  85 function listener.onconnect(conn)
  86         local secure = conn:ssl() and true or nil;
  87         local pending = {};
  88         local waiting = false;
  89         local function process_next(last_response)
  90                 --if waiting then log("debug", "can't process_next, waiting"); return; end
  91                 if sessions[conn] and #pending > 0 then
  92                         local request = t_remove(pending);
  93                         --log("debug", "process_next: %s", request.path);
  94                         waiting = true;
  95                         --handle_request(conn, request, process_next);
  96                         _1, _2, _3 = conn, request, process_next;
  97                         if not xpcall(_handle_request, _traceback_handler) then
  98                                 conn:write("HTTP/1.0 500 Internal Server Error\r\n\r\n"..events.fire_event("http-error", { code = 500, private_message = last_err }));
  99                                 conn:close();
 100                         end
 101                 else
 102                         --log("debug", "ready for more");
 103                         waiting = false;
 104                 end
 105         end
 106         local function success_cb(request)
 107                 --log("debug", "success_cb: %s", request.path);
 108                 request.secure = secure;
 109                 t_insert(pending, request);
 110                 if not waiting then
 111                         process_next();
 112                 end
 113         end
 114         local function error_cb(err)
 115                 log("debug", "error_cb: %s", err or "<nil>");
 116                 -- FIXME don't close immediately, wait until we process current stuff
 117                 -- FIXME if err, send off a bad-request response
 118                 sessions[conn] = nil;
 119                 conn:close();
 120         end
 121         sessions[conn] = parser_new(success_cb, error_cb);
 122 end
 123
 124 function listener.ondisconnect(conn)
 125         local open_response = conn._http_open_response;
 126         if open_response and open_response.on_destroy then
 127                 open_response.finished = true;
 128                 open_response:on_destroy();
 129         end
 130         sessions[conn] = nil;
 131 end
 132
 133 function listener.onincoming(conn, data)
 134         sessions[conn]:feed(data);
 135 end
 136
 137 local headerfix = setmetatable({}, {
 138         __index = function(t, k)
 139                 local v = "\r\n"..k:gsub("_", "-"):gsub("%f[%w].", s_upper)..": ";
 140                 t[k] = v;
 141                 return v;
 142         end
 143 });
 144
 145 function _M.hijack_response(response, listener)
 146         error("TODO");
 147 end
 148 function handle_request(conn, request, finish_cb)
 149         --log("debug", "handler: %s", request.path);
 150         local headers = {};
 151         for k,v in pairs(request.headers) do headers[k:gsub("-", "_")] = v; end
 152         request.headers = headers;
 153         request.conn = conn;
 154
 155         local date_header = os_date('!%a, %d %b %Y %H:%M:%S GMT'); -- FIXME use
 156         local conn_header = request.headers.connection;
 157         local keep_alive = conn_header == "Keep-Alive" or (request.httpversion == "1.1" and conn_header ~= "close");
 158
 159         local response = {
 160                 request = request;
 161                 status_code = 200;
 162                 headers = { date = date_header, connection = (keep_alive and "Keep-Alive" or "close") };
 163                 conn = conn;
 164                 send = _M.send_response;
 165                 finish_cb = finish_cb;
 166         };
 167         conn._http_open_response = response;
 168
 169         local err;
 170         if not request.headers.host then
 171                 err = "No 'Host' header";
 172         elseif not request.path then
 173                 err = "Invalid path";
 174         end
 175
 176         if err then
 177                 response.status_code = 400;
 178                 response.headers.content_type = "text/html";
 179                 response:send(events.fire_event("http-error", { code = 400, message = err }));
 180         else
 181                 local host = request.headers.host;
 182                 if host then
 183                         host = host:match("[^:]*"):lower();
 184                         local event = request.method.." "..host..request.path:match("[^?]*");
 185                         local payload = { request = request, response = response };
 186                         --log("debug", "Firing event: %s", event);
 187                         local result = events.fire_event(event, payload);
 188                         if result ~= nil then
 189                                 if result ~= true then
 190                                         local code, body = 200, "";
 191                                         local result_type = type(result);
 192                                         if result_type == "number" then
 193                                                 response.status_code = result;
 194                                                 if result >= 400 then
 195                                                         body = events.fire_event("http-error", { code = result });
 196                                                 end
 197                                         elseif result_type == "string" then
 198                                                 body = result;
 199                                         elseif result_type == "table" then
 200                                                 body = result.body;
 201                                                 result.body = nil;
 202                                                 for k, v in pairs(result) do
 203                                                         response[k] = v;
 204                                                 end
 205                                         end
 206                                         response:send(body);
 207                                 end
 208                                 return;
 209                         end
 210                 end
 211
 212                 -- if handler not called, return 404
 213                 response.status_code = 404;
 214                 response.headers.content_type = "text/html";
 215                 response:send(events.fire_event("http-error", { code = 404 }));
 216         end
 217 end
 218 function _M.send_response(response, body)
 219         if response.finished then return; end
 220         response.finished = true;
 221         response.conn._http_open_response = nil;
 222
 223         local status_line = "HTTP/"..response.request.httpversion.." "..(response.status or codes[response.status_code]);
 224         local headers = response.headers;
 225         body = body or "";
 226         headers.content_length = #body;
 227
 228         local output = { status_line };
 229         for k,v in pairs(headers) do
 230                 t_insert(output, headerfix[k]..v);
 231         end
 232         t_insert(output, "\r\n\r\n");
 233         t_insert(output, body);
 234
 235         response.conn:write(t_concat(output));
 236         if response.on_destroy then
 237                 response:on_destroy();
 238                 response.on_destroy = nil;
 239         end
 240         if headers.connection == "Keep-Alive" then
 241                 response:finish_cb();
 242         else
 243                 response.conn:close();
 244         end
 245 end
 246 function _M.add_handler(event, handler, priority)
 247         events.add_handler(event, handler, priority);
 248 end
 249 function _M.remove_handler(event, handler)
 250         events.remove_handler(event, handler);
 251 end
 252
 253 function _M.listen_on(port, interface, ssl)
 254         addserver(interface or "*", port, listener, "*a", ssl);
 255 end
 256
 257 _M.listener = listener;
 258 _M.codes = codes;
 259 _M._events = events;
 260 return _M;