Proof of concept for an aircraft metadata DB.

tools/vrs-basicaircraft-to-json.py

@@ -0,0 +1,66 @@
+#!/usr/bin/env python2
+
+#
+# Converts a Virtual Radar Server BasicAircraftLookup.sqb database
+# into a bunch of json files suitable for use by the webmap
+#
+
+import sqlite3, json
+from contextlib import closing
+
+def extract(dbfile, todir, blocklimit):
+    ac_count = 0
+    block_count = 0
+
+    blocks = {}
+    for i in xrange(16):
+        blocks['%01X' % i] = {}
+
+    print 'Reading', dbfile
+    with closing(sqlite3.connect(dbfile)) as db:
+        with closing(db.execute('SELECT a.Icao, a.Registration, m.Icao FROM Aircraft a, Model m WHERE a.ModelID = m.ModelID')) as c:
+            for icao24, reg, icaotype in c:
+                bkey = icao24[0:1].upper()
+                dkey = icao24[1:].upper()
+                blocks[bkey][dkey] = {}
+                if reg: blocks[bkey][dkey]['r'] = reg
+                if icaotype: blocks[bkey][dkey]['t'] = icaotype
+                ac_count += 1
+    print 'Read', ac_count, 'aircraft'
+
+    queue = list(blocks.keys())
+    while queue:
+        bkey = queue[0]
+        del queue[0]
+
+        blockdata = blocks[bkey]
+        if len(blockdata) > blocklimit:
+            print 'Splitting block', bkey, 'with', len(blockdata), 'entries..',
+            children = {}
+            for dkey in blockdata.keys():
+                new_bkey = bkey + dkey[0]
+                new_dkey = dkey[1:]
+
+                if new_bkey not in children: blocks[new_bkey] = children[new_bkey] = {}
+                children[new_bkey][new_dkey] = blockdata[dkey]
+
+            print len(children), 'children'
+            queue.extend(children.keys())
+            blockdata = blocks[bkey] = { 'children' : sorted(children.keys()) }
+
+        path = todir + '/' + bkey + '.json'
+        print 'Writing', len(blockdata), 'entries to', path
+        block_count += 1
+        with closing(open(path, 'w')) as f:
+            json.dump(obj=blockdata, fp=f, check_circular=False, separators=(',',':'), sort_keys=True)
+
+    print 'Wrote', block_count, 'blocks'
+
+if __name__ == '__main__':
+    import sys
+    if len(sys.argv) < 3:
+        print 'Syntax: %s <path to BasicAircraftLookup.sqb> <path to DB dir>' % sys.argv[0]
+        sys.exit(1)
+    else:
+        extract(sys.argv[1], sys.argv[2], 1000)
+        sys.exit(0)