dump1090/tools/csv-to-json.py

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#!/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, sys, csv
from contextlib import closing
def readcsv(name, infile, blocks):
print >>sys.stderr, 'Reading from', name
if len(blocks) == 0:
for i in xrange(16):
blocks['%01X' % i] = {}
ac_count = 0
reader = csv.DictReader(infile)
if not 'icao24' in reader.fieldnames:
raise RuntimeError('CSV should have at least an "icao24" column')
for row in reader:
icao24 = row['icao24']
entry = {}
for k,v in row.items():
if k != 'icao24' and v != '':
entry[k] = v
if len(entry) > 0:
ac_count += 1
bkey = icao24[0:1].upper()
dkey = icao24[1:].upper()
blocks[bkey].setdefault(dkey, {}).update(entry)
print >>sys.stderr, 'Read', ac_count, 'aircraft from', name
def writedb(blocks, todir, blocklimit, debug):
block_count = 0
print >>sys.stderr, 'Writing blocks:',
queue = sorted(blocks.keys())
while queue:
bkey = queue[0]
del queue[0]
blockdata = blocks[bkey]
if len(blockdata) > blocklimit:
if debug: print >>sys.stderr, 'Splitting block', bkey, 'with', len(blockdata), 'entries..',
# split all children out
children = {}
for dkey in blockdata.keys():
new_bkey = bkey + dkey[0]
new_dkey = dkey[1:]
if new_bkey not in children: children[new_bkey] = {}
children[new_bkey][new_dkey] = blockdata[dkey]
# look for small children we can retain in the parent, to
# reduce the total number of files needed. This reduces the
# number of blocks needed from 150 to 61
blockdata = {}
children = sorted(children.items(), key=lambda x: len(x[1]))
retained = 1
while len(children[0][1]) + retained < blocklimit:
# move this child back to the parent
c_bkey, c_entries = children[0]
for c_dkey, entry in c_entries.items():
blockdata[c_bkey[-1] + c_dkey] = entry
retained += 1
del children[0]
if debug: print >>sys.stderr, len(children), 'children created,', len(blockdata), 'entries retained in parent'
children = sorted(children, key=lambda x: x[0])
blockdata['children'] = [x[0] for x in children]
blocks[bkey] = blockdata
for c_bkey, c_entries in children:
blocks[c_bkey] = c_entries
queue.append(c_bkey)
path = todir + '/' + bkey + '.json'
if debug: print >>sys.stderr, 'Writing', len(blockdata), 'entries to', path
else: print >>sys.stderr, bkey,
block_count += 1
with closing(open(path, 'w')) as f:
json.dump(obj=blockdata, fp=f, check_circular=False, separators=(',',':'), sort_keys=True)
print >>sys.stderr, 'done.'
print >>sys.stderr, 'Wrote', block_count, 'blocks'
if __name__ == '__main__':
if len(sys.argv) < 3:
print >>sys.stderr, 'Reads a CSV file with aircraft information and produces a directory of JSON files'
print >>sys.stderr, 'Syntax: %s <path to CSV> [... additional CSV files ...] <path to DB dir>' % sys.argv[0]
print >>sys.stderr, 'Use "-" as the CSV path to read from stdin'
print >>sys.stderr, 'If multiple CSV files are specified and they provide conflicting data'
print >>sys.stderr, 'then the data from the last-listed CSV file is used'
sys.exit(1)
blocks = {}
for filename in sys.argv[1:-1]:
if filename == '-':
readcsv('stdin', sys.stdin, blocks)
else:
with closing(open(filename, 'r')) as infile:
readcsv(filename, infile, blocks)
writedb(blocks, sys.argv[-1], 1000, False)
sys.exit(0)