RLGWeb: switch to JSON protocol.
Port the JSON communication from WebTTY to RLGWeb. Fixing out-of-order messages is still not implemented on the server side. Terminal size is still hard-coded. Unused code is still lying around.
This commit is contained in:
John "Elwin" Edwards
parent
db55f3f83c
commit
94f8630eb4
2 changed files with 162 additions and 75 deletions
109
rlgwebd.js
109
rlgwebd.js
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@ -43,7 +43,7 @@ var games = {
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* adds itself to the sessions dict. It currently assumes the user has
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* been authenticated.
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*/
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function TermSession(game, user, files) {
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function TermSession(game, user, files, dims) {
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/* First make sure starting the game will work. */
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if (!(game in games)) {
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// TODO: throw an exception instead
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@ -57,15 +57,33 @@ function TermSession(game, user, files) {
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}
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/* Grab a spot in the sessions table. */
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sessions[this.sessid] = this;
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/* State for messaging. */
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this.nsend = 0;
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this.nrecv = 0;
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this.msgQ = []
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/* Set up the sizes. */
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this.w = Math.floor(Number(dims[1]));
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if (!(this.w > 0 && this.w < 256))
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this.w = 80;
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this.h = Math.floor(Number(dims[0]));
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if (!(this.h > 0 && this.h < 256))
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this.h = 24;
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/* Environment. */
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var childenv = {};
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for (var key in process.env) {
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childenv[key] = process.env[key];
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}
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childenv["PTYHELPER"] = String(this.h) + "x" + String(this.w);
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/* TODO handle tty-opening errors */
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/* TODO make argument-finding into a method */
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args = [games[game].path, "-n", user.toString()];
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this.child = child_process.spawn("/bin/ptyhelper", args);
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this.child = child_process.spawn("/bin/ptyhelper", args, {"env": childenv});
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var ss = this;
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this.alive = true;
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this.data = [];
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this.lock = files[0];
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fs.writeFile(this.lock, this.child.pid.toString() + '\n80\n24\n', "utf8");
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fs.writeFile(this.lock, this.child.pid.toString() + '\n' + this.w + '\n' +
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this.h + '\n', "utf8");
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this.record = fs.createWriteStream(files[1], { mode: 0664 });
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/* END setup */
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function ttyrec_chunk(buf) {
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@ -206,6 +224,22 @@ function getFormValues(formtext) {
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return data;
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}
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function getMsg(posttext) {
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var jsonobj;
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if (!posttext)
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return {};
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try {
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jsonobj = JSON.parse(posttext);
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}
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catch (e) {
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if (e instanceof SyntaxError)
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return {};
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}
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if (typeof(jsonobj) != "object")
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return {};
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return jsonobj;
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}
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function auth(username, password) {
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// Real authentication not implemented
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return true;
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@ -224,9 +258,10 @@ function login(req, res, formdata) {
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sendError(res, 2, "Password not given.");
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return;
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}
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var username = formdata["name"][0];
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var password = formdata["pw"][0];
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var gname = formdata["game"][0];
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var username = formdata["name"];
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var password = formdata["pw"];
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var gname = formdata["game"];
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var dims = [formdata["h"], formdata["w"]];
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if (!(gname in games)) {
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sendError(res, 2, "No such game: " + gname);
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console.log("Request for nonexistant game \"" + gname + "\"");
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@ -239,13 +274,15 @@ function login(req, res, formdata) {
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var ts = timestamp();
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var lockfile = path.join(progressdir, username + ":node:" + ts + ".ttyrec");
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var ttyrec = path.join("/dgldir/ttyrec", username, gname, ts + ".ttyrec");
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var nsession = new TermSession(gname, username, [lockfile, ttyrec]);
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var nsession = new TermSession(gname, username, [lockfile, ttyrec], dims);
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if (nsession) {
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/* Technically there's a race condition for the "lock"file, but since
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* it requires the user deliberately starting two games at similar times,
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* it's not too serious. We can't get O_EXCL in Node anyway. */
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res.writeHead(200, {'Content-Type': 'text/plain'});
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res.write("l1\n" + nsession.sessid + "\n");
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var reply = {"t": "l", "id": nsession.sessid, "w": nsession.w, "h":
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nsession.h};
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res.write(JSON.stringify(reply));
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res.end();
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console.log("%s playing %s (key %s, pid %d)", username, gname,
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nsession.sessid, nsession.child.pid);
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@ -309,14 +346,16 @@ function logout(term, res) {
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cterm.close();
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var resheaders = {'Content-Type': 'text/plain'};
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res.writeHead(200, resheaders);
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res.write("q1\n\n");
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res.write(JSON.stringify({"t": "q"}));
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res.end();
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return;
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}
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function findTermSession(formdata) {
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if (typeof(formdata) != "object")
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return null;
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if ("id" in formdata) {
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var sessid = formdata["id"][0];
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var sessid = formdata["id"];
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if (sessid in sessions) {
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return sessions[sessid];
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}
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@ -370,22 +409,24 @@ function serveStatic(req, res, fname) {
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function readFeed(res, term) {
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if (term) {
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var reply = {};
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var result = term.read();
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res.writeHead(200, { "Content-Type": "text/plain" });
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if (result == null)
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resultstr = "";
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else
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resultstr = result.toString("hex");
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if (result == null && !term.alive) {
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/* Child has terminated and data is flushed. */
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res.write("q1\n\n");
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if (result == null) {
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if (term.alive)
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reply.t = "n";
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else
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reply.t = "q";
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}
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else
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res.write("d" + resultstr.length.toString() + "\n" + resultstr + "\n");
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else {
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reply.t = "d";
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reply.n = term.nsend++;
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reply.d = result.toString("hex");
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}
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res.writeHead(200, { "Content-Type": "text/plain" });
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res.write(JSON.stringify(reply));
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res.end();
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}
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else {
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//console.log("Where's the term?");
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sendError(res, 1, null);
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}
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}
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@ -395,14 +436,14 @@ var errorcodes = [ "Generic Error", "Not logged in", "Invalid data",
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function sendError(res, ecode, msg) {
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res.writeHead(200, { "Content-Type": "text/plain" });
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if (ecode < errorcodes.length && ecode > 0) {
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var emsg = errorcodes[ecode];
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if (msg)
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emsg += ": " + msg;
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res.write("E" + ecode + '\n' + emsg + '\n');
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}
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else
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res.write("E0\nGeneric Error\n");
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var edict = {"t": "E"};
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if (!(ecode < errorcodes.length && ecode > 0))
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ecode = 0;
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edict["c"] = ecode;
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edict["s"] = errorcodes[ecode];
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if (msg)
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edict["s"] += ": " + msg;
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res.write(JSON.stringify(edict));
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res.end();
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}
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@ -421,7 +462,8 @@ function handler(req, res) {
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/* This will send the response once the whole request is here. */
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function respond() {
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formdata = getFormValues(reqbody);
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//formdata = getFormValues(reqbody);
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formdata = getMsg(reqbody);
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var target = url.parse(req.url).pathname;
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var cterm = findTermSession(formdata);
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/* First figure out if the client is POSTing to a command interface. */
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@ -431,18 +473,19 @@ function handler(req, res) {
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sendError(res, 1, null);
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return;
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}
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if ("quit" in formdata) {
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if (formdata.t == "q") {
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/* The client wants to terminate the process. */
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logout(cterm, res);
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}
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else if (formdata["keys"]) {
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else if (formdata.t == "d" && typeof(formdata.d) == "string") {
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/* process the keys */
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hexstr = formdata["keys"][0].replace(/[^0-9a-f]/gi, "");
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hexstr = formdata.d.replace(/[^0-9a-f]/gi, "");
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if (hexstr.length % 2 != 0) {
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sendError(res, 2, "incomplete byte");
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return;
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}
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keybuf = new Buffer(hexstr, "hex");
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/* TODO OoO correction */
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cterm.write(keybuf);
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}
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readFeed(res, cterm);
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