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