86 lines
3.0 KiB
Python
86 lines
3.0 KiB
Python
#!/usr/bin/env python
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"""
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This is a simple vector tile server that returns a PBF tile for /tiles/{z}/{x}/{y}.pbf requests
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Use these environment variables to configure PostgreSQL access:
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POSTGRES_HOST, POSTGRES_PORT, POSTGRES_DB, POSTGRES_PASSWORD
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Usage:
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server <prepared-sql-file> [--fname <name>] [--port <port>]
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server --help
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server --version
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<prepared-sql-file> SQL file generated by generate-sqltomvt script with the --prepared flag
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Options:
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--fname=<name> Name of the generated function [default: gettile]
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-p --port=<port> Serve on this port [default: 8080]
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--help Show this screen.
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--version Show version.
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"""
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import tornado.ioloop
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import tornado.web
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import io
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import os
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from docopt import docopt
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from sqlalchemy import create_engine, inspect
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from sqlalchemy.orm import sessionmaker
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class GetTile(tornado.web.RequestHandler):
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def initialize(self, session, query):
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self.db_session = session
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self.db_query = query
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def get(self, z, x, y):
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z, x, y = int(z), int(x), int(y)
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try:
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result = self.db_session.execute(self.db_query, params=dict(z=z, x=x, y=y)).fetchall()
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if result:
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self.set_header("Content-Type", "application/x-protobuf")
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self.set_header("Content-Disposition", "attachment")
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self.set_header("Access-Control-Allow-Origin", "*")
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value = io.BytesIO(result[0][0]).getvalue()
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self.write(value)
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print('{0},{1},{2} returned {3} bytes'.format(z, x, y, len(value)))
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else:
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self.clear()
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self.set_status(404)
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print('Got NULL result for {0},{1},{2}'.format(z, x, y))
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except Exception as err:
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print('{0},{1},{2} threw an exception {3}'.format(z, x, y, err))
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raise
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def main(args):
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sqlfile = args['<prepared-sql-file>']
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with open(sqlfile, 'r') as stream:
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prepared = stream.read()
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pghost = os.getenv('POSTGRES_HOST', 'localhost') + ':' + os.getenv('POSTGRES_PORT', '5432')
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pgdb = os.getenv('POSTGRES_DB', 'openmaptiles')
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pgcreds = os.getenv('POSTGRES_USER', 'openmaptiles') + ':' + os.getenv('POSTGRES_PASSWORD', 'openmaptiles')
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engine = create_engine('postgresql://' + pgcreds + '@' + pghost + '/' + pgdb)
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print('Connecting to PostgreSQL at {0}, db={1}'.format(pghost, pgdb))
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inspector = inspect(engine)
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session = sessionmaker(bind=engine)()
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session.execute(prepared)
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query = "EXECUTE {0}(:z, :x, :y)".format(args['--fname'])
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print('Loaded {0}, will use "{1}" to get vector tiles.'.format(sqlfile, query))
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port = int(args['--port'])
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application = tornado.web.Application([(
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r"/tiles/([0-9]+)/([0-9]+)/([0-9]+).pbf",
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GetTile,
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dict(session=session, query=query)
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)])
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application.listen(port)
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print("Postserve started, listening on 0.0.0.0:{0}".format(port))
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tornado.ioloop.IOLoop.instance().start()
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if __name__ == "__main__":
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main(docopt(__doc__, version="1.0"))
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