Diff

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/net/http/server.lua	Tue Apr 24 21:59:20 2012 +0100
@@ -0,0 +1,283 @@
+
+local t_insert, t_remove, t_concat = table.insert, table.remove, table.concat;
+local parser_new = require "net.http.parser".new;
+local events = require "util.events".new();
+local addserver = require "net.server".addserver;
+local log = require "util.logger".init("http.server");
+local os_date = os.date;
+local pairs = pairs;
+local s_upper = string.upper;
+local setmetatable = setmetatable;
+local xpcall = xpcall;
+local debug = debug;
+local tostring = tostring;
+local codes = require "net.http.codes";
+local _G = _G;
+local legacy_httpserver = require "net.httpserver";
+
+local _M = {};
+
+local sessions = {};
+local handlers = {};
+
+local listener = {};
+
+local function is_wildcard_event(event)
+	return event:sub(-2, -1) == "/*";
+end
+local function is_wildcard_match(wildcard_event, event)
+	return wildcard_event:sub(1, -2) == event:sub(1, #wildcard_event-1);
+end
+
+local event_map = events._event_map;
+setmetatable(events._handlers, {
+	__index = function (handlers, curr_event)
+		if is_wildcard_event(curr_event) then return; end -- Wildcard events cannot be fired
+		-- Find all handlers that could match this event, sort them
+		-- and then put the array into handlers[event]
+		local matching_handlers_set = {};
+		local handlers_array = {};
+		for event, handlers_set in pairs(event_map) do
+			if event == curr_event or
+			is_wildcard_event(event) and is_wildcard_match(event, curr_event) then
+				for handler, priority in pairs(handlers_set) do
+					matching_handlers_set[handler] = { (select(2, event:gsub("/", "%1"))), priority };
+					table.insert(handlers_array, handler);
+				end
+			end
+		end
+		if #handlers_array == 0 then return; end
+		table.sort(handlers_array, function(b, a)
+			local a_score, b_score = matching_handlers_set[a], matching_handlers_set[b];
+			for i = 1, #a_score do
+				if a ~= b then -- If equal, compare next score value
+					return a_score[i] < b_score[i];
+				end
+			end
+			return false;
+		end);
+		handlers[curr_event] = handlers_array;
+		return handlers_array;
+	end;
+	__newindex = function (handlers, curr_event, handlers_array)
+		if handlers_array == nil
+		and is_wildcard_event(curr_event) then
+			-- Invalidate all matching
+			for event in pairs(handlers) do
+				if is_wildcard_match(curr_event, event) then
+					handlers[event] = nil;
+				end
+			end
+		end
+	end;
+});
+
+local handle_request;
+local _1, _2, _3;
+local function _handle_request() return handle_request(_1, _2, _3); end
+local function _traceback_handler(err) log("error", "Traceback[http]: %s: %s", tostring(err), debug.traceback()); end
+
+function listener.onconnect(conn)
+	local secure = conn:ssl() and true or nil;
+	local pending = {};
+	local waiting = false;
+	local function process_next(last_response)
+		--if waiting then log("debug", "can't process_next, waiting"); return; end
+		if sessions[conn] and #pending > 0 then
+			local request = t_remove(pending);
+			--log("debug", "process_next: %s", request.path);
+			waiting = true;
+			--handle_request(conn, request, process_next);
+			_1, _2, _3 = conn, request, process_next;
+			if not xpcall(_handle_request, _traceback_handler) then
+				conn:write("HTTP/1.0 503 Internal Server Error\r\n\r\nAn error occured during the processing of this request.");
+				conn:close();
+			end
+		else
+			--log("debug", "ready for more");
+			waiting = false;
+		end
+	end
+	local function success_cb(request)
+		--log("debug", "success_cb: %s", request.path);
+		request.secure = secure;
+		t_insert(pending, request);
+		if not waiting then
+			process_next();
+		end
+	end
+	local function error_cb(err)
+		log("debug", "error_cb: %s", err or "<nil>");
+		-- FIXME don't close immediately, wait until we process current stuff
+		-- FIXME if err, send off a bad-request response
+		sessions[conn] = nil;
+		conn:close();
+	end
+	sessions[conn] = parser_new(success_cb, error_cb);
+end
+
+function listener.ondisconnect(conn)
+	sessions[conn] = nil;
+end
+
+function listener.onincoming(conn, data)
+	sessions[conn]:feed(data);
+end
+
+local headerfix = setmetatable({}, {
+	__index = function(t, k)
+		local v = "\r\n"..k:gsub("_", "-"):gsub("%f[%w].", s_upper)..": ";
+		t[k] = v;
+		return v;
+	end
+});
+
+function _M.hijack_response(response, listener)
+	error("TODO");
+end
+function handle_request(conn, request, finish_cb)
+	--log("debug", "handler: %s", request.path);
+	local headers = {};
+	for k,v in pairs(request.headers) do headers[k:gsub("-", "_")] = v; end
+	request.headers = headers;
+	request.conn = conn;
+
+	local date_header = os_date('!%a, %d %b %Y %H:%M:%S GMT'); -- FIXME use
+	local conn_header = request.headers.connection;
+	local keep_alive = conn_header == "Keep-Alive" or (request.httpversion == "1.1" and conn_header ~= "close");
+
+	local response = {
+		request = request;
+		status_code = 200;
+		headers = { date = date_header, connection = (keep_alive and "Keep-Alive" or "close") };
+		conn = conn;
+		send = _M.send_response;
+		finish_cb = finish_cb;
+	};
+
+	if not request.headers.host then
+		response.status_code = 400;
+		response.headers.content_type = "text/html";
+		response:send("<html><head>400 Bad Request</head><body>400 Bad Request: No Host header.</body></html>");
+	else
+		-- TODO call handler
+		--response.headers.content_type = "text/plain";
+		--response:send("host="..(request.headers.host or "").."\npath="..request.path.."\n"..(request.body or ""));
+		local host = request.headers.host;
+		if host then
+			host = host:match("[^:]*"):lower();
+			local event = request.method.." "..host..request.path:match("[^?]*");
+			local payload = { request = request, response = response };
+			--log("debug", "Firing event: %s", event);
+			local result = events.fire_event(event, payload);
+			if result ~= nil then
+				if result ~= true then
+					local code, body = 200, "";
+					local result_type = type(result);
+					if result_type == "number" then
+						response.status_code = result;
+					elseif result_type == "string" then
+						body = result;
+					elseif result_type == "table" then
+						body = result.body;
+						result.body = nil;
+						for k, v in pairs(result) do
+							response[k] = v;
+						end
+					end
+					response:send(body);
+				end
+				return;
+			end
+		end
+
+		-- if handler not called, fallback to legacy httpserver handlers
+		_M.legacy_handler(request, response);
+	end
+end
+function _M.send_response(response, body)
+	local status_line = "HTTP/"..response.request.httpversion.." "..(response.status or codes[response.status_code]);
+	local headers = response.headers;
+	body = body or "";
+	headers.content_length = #body;
+
+	local output = { status_line };
+	for k,v in pairs(headers) do
+		t_insert(output, headerfix[k]..v);
+	end
+	t_insert(output, "\r\n\r\n");
+	t_insert(output, body);
+
+	response.conn:write(t_concat(output));
+	if headers.connection == "Keep-Alive" then
+		response:finish_cb();
+	else
+		response.conn:close();
+	end
+end
+function _M.legacy_handler(request, response)
+	log("debug", "Invoking legacy handler");
+	local base = request.path:match("^/([^/?]+)");
+	local legacy_server = legacy_httpserver and legacy_httpserver.new.http_servers[5280];
+	local handler = legacy_server and legacy_server.handlers[base];
+	if not handler then handler = legacy_httpserver and legacy_httpserver.set_default_handler.default_handler; end
+	if handler then
+		-- add legacy properties to request object
+		request.url = { path = request.path };
+		request.handler = response.conn;
+		request.id = tostring{}:match("%x+$");
+		local headers = {};
+		for k,v in pairs(request.headers) do
+			headers[k:gsub("_", "-")] = v;
+		end
+		request.headers = headers;
+		function request:send(resp)
+			if self.destroyed then return; end
+			if resp.body or resp.headers then
+				if resp.headers then
+					for k,v in pairs(resp.headers) do response.headers[k] = v; end
+				end
+				response:send(resp.body)
+			else
+				response:send(resp)
+			end
+			self.sent = true;
+			self:destroy();
+		end
+		function request:destroy()
+			if self.destroyed then return; end
+			if not self.sent then return self:send(""); end
+			self.destroyed = true;
+			if self.on_destroy then
+				log("debug", "Request has destroy callback");
+				self:on_destroy();
+			else
+				log("debug", "Request has no destroy callback");
+			end
+		end
+		local r = handler(request.method, request.body, request);
+		if r ~= true then
+			request:send(r);
+		end
+	else
+		log("debug", "No handler found");
+		response.status_code = 404;
+		response.headers.content_type = "text/html";
+		response:send("<html><head><title>404 Not Found</title></head><body>404 Not Found: No such page.</body></html>");
+	end
+end
+
+function _M.add_handler(event, handler, priority)
+	events.add_handler(event, handler, priority);
+end
+function _M.remove_handler(event, handler)
+	events.remove_handler(event, handler);
+end
+
+function _M.listen_on(port, interface, ssl)
+	addserver(interface or "*", port, listener, "*a", ssl);
+end
+
+_M.listener = listener;
+_M.codes = codes;
+return _M;