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annotate webtty.js @ 9:826a7ced69f8

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Make the emulator screen resizable.
author John "Elwin" Edwards <elwin@sdf.org>
date Wed, 09 May 2012 13:38:05 -0700
parents d1b3c3af34d6
children d051aad3e95f
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1 #!/usr/bin/env node
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2 var http = require('http');
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3 var url = require('url');
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4 var path = require('path');
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5 var fs = require('fs');
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6 var child_process = require("child_process");
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7
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8 var serveStaticRoot = "/home/elwin/hk/nodejs/rlg/s/";
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d1b3c3af34d6 WebTTY: switch terminal size to 80x25.
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9 var ptyhelp = "/home/elwin/hk/nodejs/rlg/ptyhelper";
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10 var sessions = {};
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11
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12 var env_dontuse = {"TMUX": true, "TMUX_PANE": true};
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13
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14 /* Constructor for TermSessions. Note that it opens the terminal and
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15 * adds itself to the sessions dict.
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16 */
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17 function TermSession(sessid, h, w) {
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18 /* Set up the sizes. */
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19 w = Math.floor(Number(w));
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20 if (!(w > 0 && w < 256))
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21 w = 80;
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22 this.w = w;
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23 h = Math.floor(Number(h));
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24 if (!(h > 0 && h < 256))
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25 h = 25;
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26 this.h = h;
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27 /* Customize the environment. */
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28 var childenv = {};
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29 for (var key in process.env) {
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30 if (!(key in env_dontuse))
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31 childenv[key] = process.env[key];
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32 }
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33 childenv["PTYHELPER"] = String(this.h) + "x" + String(this.w);
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34 // Should setsid get set?
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35 var spawnopts = {"env": childenv, "cwd": process.env["HOME"]};
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36 this.child = child_process.spawn(ptyhelp, ["bash"], spawnopts);
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37 var ss = this;
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38 /* Eventually we'll need to make sure the sessid isn't in use yet. */
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39 this.sessid = sessid;
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40 this.alive = true;
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41 this.data = [];
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42 this.child.stdout.on("data", function (buf) {
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43 ss.data.push(buf);
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44 });
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45 this.child.stderr.on("data", function (buf) {
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46 ss.data.push(buf);
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47 });
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48 this.child.on("exit", function (code, signal) {
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49 ss.exitcode = (code != null ? code : 255);
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50 ss.alive = false;
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51 /* Wait for all the data to get collected */
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52 setTimeout(ss.cleanup, 1000);
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53 });
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54 this.write = function (data) {
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55 if (this.alive)
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56 this.child.stdin.write(data);
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57 /* Otherwise, throw some kind of exception? */
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58 };
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59 this.read = function () {
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60 if (this.data.length == 0)
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61 return null;
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62 var pos = 0;
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63 var i = 0;
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64 for (i = 0; i < this.data.length; i++)
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65 pos += this.data[i].length;
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66 var nbuf = new Buffer(pos);
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67 var tptr;
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68 pos = 0;
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69 while (this.data.length > 0) {
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70 tptr = this.data.shift();
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71 tptr.copy(nbuf, pos);
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72 pos += tptr.length;
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73 }
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74 return nbuf;
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75 };
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76 this.close = function () {
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77 if (this.alive)
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78 this.child.kill('SIGHUP');
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79 };
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80 this.cleanup = function () {
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81 /* Call this when the child is dead. */
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82 if (this.alive)
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83 return;
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84 /* Give the client a chance to read any leftover data. */
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85 if (ss.data.length > 0)
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