Proof of concept for an aircraft metadata DB.

public_html/dbloader.js

@@ -0,0 +1,118 @@
+// -*- mode: javascript; indent-tabs-mode: nil; c-basic-offset: 8 -*-
+
+// Part of dump1090, a Mode S message decoder for RTLSDR devices.
+//
+// dbloader.js: load aircraft metadata from static json files
+//
+// Copyright (c) 2014,2015 Oliver Jowett <oliver@mutability.co.uk>
+//
+// This file is free software: you may copy, redistribute and/or modify it
+// under the terms of the GNU General Public License as published by the
+// Free Software Foundation, either version 2 of the License, or (at your
+// option) any later version.
+//
+// This file is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+"use strict";
+
+var _aircraft_cache = {};
+
+function getAircraftData(icao) {
+        var defer;
+
+        icao = icao.toUpperCase();
+
+        if (icao in _aircraft_cache) {
+                defer = _aircraft_cache[icao];
+        } else {
+                // load from blocks:
+                defer = _aircraft_cache[icao] = $.Deferred();
+                request_from_db(icao, 1, defer);
+        }
+
+        return defer;
+}
+
+function request_from_db(icao, level, defer) {
+        var bkey = icao.substring(0, level);
+        var dkey = icao.substring(level);
+        var req = db_ajax(bkey);
+
+        req.done(function(data) {
+                var subkey;
+
+                if ("children" in data) {
+                        subkey = bkey + dkey.substring(0,1);
+                        if (data.children.indexOf(subkey) == -1) {
+                                defer.reject();
+                        } else {
+                                request_from_db(icao, level+1, defer);
+                        }
+                } else {
+                        if (dkey in data) {
+                                defer.resolve(data[dkey]);
+                        } else {
+                                defer.reject();
+                        }
+                }
+        });
+
+        req.fail(function(jqXHR,textStatus,errorThrown) {
+                defer.reject();
+        });
+}
+
+var _request_count = 0;
+var _request_queue = [];
+var _request_cache = {};
+
+var MAX_REQUESTS = 2;
+
+function db_ajax(bkey) {
+        var defer;
+
+        if (bkey in _request_cache) {
+                return _request_cache[bkey];
+        }
+
+        if (_request_count < MAX_REQUESTS) {
+                // just do ajax directly
+                ++_request_count;
+                defer = _request_cache[bkey] = $.ajax({ url: 'db/' + bkey + '.json',
+                                                        cache: true,
+                                                        timeout: 5000,
+                                                        dataType : 'json' });
+                defer.always(db_ajax_request_complete);
+        } else {
+                // put it in the queue
+                defer = _request_cache[bkey] = $.Deferred();
+                defer.bkey = bkey;
+                _request_queue.push(defer);
+        }
+
+        return defer;
+}
+
+function db_ajax_request_complete() {
+        var req;
+        var ajaxreq;
+
+        if (_request_queue.length == 0) {
+                --_request_count;
+        } else {
+                req = _request_queue.shift();
+                ajaxreq = $.ajax({ url: 'db/' + req.bkey + '.json',
+                                   cache: true,
+                                   timeout: 5000,
+                                   dataType : 'json' });
+                ajaxreq.done(function(data) { req.resolve(data); });
+                ajaxreq.fail(function(jqxhr, status, error) { req.reject(jqxhr, status, error); });
+                ajaxreq.always(db_ajax_request_complete);
+        }
+}

public_html/gmap.html

@@ -8,6 +8,7 @@
 		<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?sensor=false&amp;libraries=geometry"></script>
 		<script type="text/javascript" src="config.js"></script>
 		<script type="text/javascript" src="markers.js"></script>
+		<script type="text/javascript" src="dbloader.js"></script>
 		<script type="text/javascript" src="planeObject.js"></script>
 		<script type="text/javascript" src="formatter.js"></script>
 		<script type="text/javascript" src="script.js"></script>
@@ -114,6 +115,8 @@
                                           <span id="selected_icao"></span>
                                         </a>
 
+                                        <span id="selected_registration"></span>
+                                        <span id="selected_icaotype"></span>
                                         <span id="selected_emergency"></span>
                                         <span id="selected_links">
                                           <a id="selected_fr24_link" href="" target="_blank">[FR24]</a>

public_html/planeObject.js

@@ -36,6 +36,23 @@ function PlaneObject(icao) {
         this.marker = null;
         this.icon = { type: 'generic',
                       fillOpacity: 0.9 };
+
+        // request metadata
+        this.registration = null;
+        this.icaotype = null;
+        getAircraftData(this.icao).done(function(data) {
+                if ("r" in data) {
+                        this.registration = data.r;
+                }
+
+                if ("t" in data) {
+                        this.icaotype = data.t;
+                }
+
+                if (this.selected) {
+		        refreshSelected();
+                }
+        }.bind(this));
 }
 
 // Appends data to the running track so we can get a visual tail on the plane

public_html/script.js

@@ -554,7 +554,19 @@ function refreshSelected() {
                 $('#selected_callsign').text('n/a');
                 $('#selected_links').css('display','none');
         }
-                
+
+        if (selected.registration !== null) {
+                $('#selected_registration').text(selected.registration);
+        } else {
+                $('#selected_registration').text("");
+        }
+
+        if (selected.icaotype !== null) {
+                $('#selected_icaotype').text(selected.icaotype);
+        } else {
+                $('#selected_icaotype').text("");
+        }
+
         var emerg = document.getElementById('selected_emergency');
         if (selected.squawk in SpecialSquawks) {
                 emerg.className = SpecialSquawks[selected.squawk].cssClass;

public_html/style.css

@@ -34,6 +34,8 @@ div#loader { z-index: 99; position: absolute; left: 0; top: 0; bottom: 0; right:
 .infoblock_body       { font-size: small; }
 
 #selected_icao { font-size: x-small; }
+#selected_registration { font-size: x-small; }
+#selected_icaotype { font-size: x-small; }
 
 .dim    { opacity: 0.3; filter:alpha(opacity=30); /* For IE8 and earlier */ }