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annotate rlgwebd.js @ 16:ef6127ed6da3

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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.
author John "Elwin" Edwards <elwin@sdf.org>
date Thu, 17 May 2012 09:32:19 -0700
parents ad0a31e52007
children d3e3d6b4016b
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1 #!/usr/bin/env node
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2
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3 // If you can't quite trust node to find it on its own
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4 var localModules = '/usr/local/lib/node_modules/';
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5 var http = require('http');
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6 var url = require('url');
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7 var path = require('path');
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8 var fs = require('fs');
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9 var child_process = require('child_process');
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10 var daemon = require(path.join(localModules, "daemon"));
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11
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12 var chrootDir = "/var/dgl/";
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13 var dropToUID = 501;
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14 var dropToGID = 501;
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15 var serveStaticRoot = "/var/www/"; // inside the chroot
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16 var passwdfile = "/dgldir/dgl-login";
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17 var sessions = {};
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18
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19 var games = {
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20 "rogue3": {
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21 "name": "Rogue V3",
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22 "uname": "rogue3",
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23 "path": "/bin/rogue3"
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24 },
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25 "rogue4": {
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26 "name": "Rogue V4",
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27 "uname": "rogue4",
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28 "path": "/bin/rogue4"
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29 },
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30 "rogue5": {
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31 "name": "Rogue V5",
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32 "uname": "rogue5",
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33 "path": "/bin/rogue5"
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34 },
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35 "srogue": {
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36 "name": "Super-Rogue",
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37 "uname": "srogue",
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38 "path": "/bin/srogue"
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39 }
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40 };
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41
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42 /* Constructor for TermSessions. Note that it opens the terminal and
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43 * adds itself to the sessions dict. It currently assumes the user has
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44 * been authenticated.
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45 */
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46 function TermSession(game, user, files, dims) {
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47 /* First make sure starting the game will work. */
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48 if (!(game in games)) {
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49 // TODO: throw an exception instead
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50 return null;
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51 }
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52 /* This order seems to best avoid race conditions... */
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53 this.alive = false;
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54 this.sessid = randkey();
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55 while (this.sessid in sessions) {
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56 this.sessid = randkey();
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57 }
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58 /* Grab a spot in the sessions table. */
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59 sessions[this.sessid] = this;
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60 /* State for messaging. */
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61 this.nsend = 0;
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62 this.nrecv = 0;
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63 this.msgQ = []
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64 /* Set up the sizes. */
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65 this.w = Math.floor(Number(dims[1]));
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66 if (!(this.w > 0 && this.w < 256))
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67 this.w = 80;
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68 this.h = Math.floor(Number(dims[0]));
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69 if (!(this.h > 0 && this.h < 256))
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70 this.h = 24;
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71 /* Environment. */
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72 var childenv = {};
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73 for (var key in process.env) {
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74 childenv[key] = process.env[key];
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75 }
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76 childenv["PTYHELPER"] = String(this.h) + "x" + String(this.w);
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77 /* TODO handle tty-opening errors */
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78 /* TODO make argument-finding into a method */
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79 args = [games[game].path, "-n", user.toString()];
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80 this.child = child_process.spawn("/bin/ptyhelper", args, {"env": childenv});
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81 var ss = this;
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82 this.alive = true;
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83 this.data = [];
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84 this.lock = files[0];
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85 fs.writeFile(this.lock, this.child.pid.toString() + '\n' + this.w + '\n' +