c0d24f12c9
SQLite does not deal well with concurrency. Avoid database locked errors by synchronizing database access using a threading.Lock().
134 lines
4.7 KiB
Python
134 lines
4.7 KiB
Python
#
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# Copyright 2010 Nick Foster
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#
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# This file is part of gr-air-modes
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#
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# gr-air-modes is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3, or (at your option)
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# any later version.
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#
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# gr-air-modes is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with gr-air-modes; see the file COPYING. If not, write to
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# the Free Software Foundation, Inc., 51 Franklin Street,
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# Boston, MA 02110-1301, USA.
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#
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import time, os, sys, threading
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from string import split, join
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import modes_parse
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import sqlite3
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from modes_exceptions import *
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class modes_output_sql(modes_parse.modes_parse):
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def __init__(self, mypos, filename):
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modes_parse.modes_parse.__init__(self, mypos)
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self._lock = threading.Lock()
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#create the database
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self.db = sqlite3.connect(filename)
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#now execute a schema to create the tables you need
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c = self.db.cursor()
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query = """CREATE TABLE IF NOT EXISTS "positions" (
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"icao" INTEGER KEY NOT NULL,
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"seen" TEXT NOT NULL,
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"alt" INTEGER,
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"lat" REAL,
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"lon" REAL
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);"""
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self.locked_execute(c, query)
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query = """CREATE TABLE IF NOT EXISTS "vectors" (
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"icao" INTEGER KEY NOT NULL,
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"seen" TEXT NOT NULL,
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"speed" REAL,
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"heading" REAL,
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"vertical" REAL
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);"""
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self.locked_execute(c, query)
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query = """CREATE TABLE IF NOT EXISTS "ident" (
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"icao" INTEGER PRIMARY KEY NOT NULL,
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"ident" TEXT NOT NULL
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);"""
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self.locked_execute(c, query)
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c.close()
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self.db.commit()
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def __del__(self):
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self.db.close()
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def locked_execute(self, c, query):
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with self._lock:
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c.execute(query)
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def output(self, message):
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try:
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query = self.make_insert_query(message)
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if query is not None:
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with self._lock:
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c = self.db.cursor()
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c.execute(query)
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c.close()
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self.db.commit()
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except ADSBError:
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pass
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def make_insert_query(self, message):
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#assembles a SQL query tailored to our database
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#this version ignores anything that isn't Type 17 for now, because we just don't care
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[data, ecc, reference, timestamp] = message.split()
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data = modes_parse.modes_reply(long(data, 16))
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ecc = long(ecc, 16)
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# reference = float(reference)
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query = None
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msgtype = data["df"]
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if msgtype == 17:
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query = self.sql17(data)
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return query
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def sql17(self, data):
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icao24 = data["aa"]
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bdsreg = data["me"].get_type()
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retstr = None
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if bdsreg == 0x08:
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(msg, typename) = self.parseBDS08(data)
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retstr = "INSERT OR REPLACE INTO ident (icao, ident) VALUES (" + "%i" % icao24 + ", '" + msg + "')"
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elif bdsreg == 0x06:
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[ground_track, decoded_lat, decoded_lon, rnge, bearing] = self.parseBDS06(data)
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altitude = 0
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if decoded_lat is None: #no unambiguously valid position available
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retstr = None
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else:
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retstr = "INSERT INTO positions (icao, seen, alt, lat, lon) VALUES (" + "%i" % icao24 + ", datetime('now'), " + str(altitude) + ", " + "%.6f" % decoded_lat + ", " + "%.6f" % decoded_lon + ")"
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elif bdsreg == 0x05:
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[altitude, decoded_lat, decoded_lon, rnge, bearing] = self.parseBDS05(data)
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if decoded_lat is None: #no unambiguously valid position available
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retstr = None
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else:
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retstr = "INSERT INTO positions (icao, seen, alt, lat, lon) VALUES (" + "%i" % icao24 + ", datetime('now'), " + str(altitude) + ", " + "%.6f" % decoded_lat + ", " + "%.6f" % decoded_lon + ")"
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elif bdsreg == 0x09:
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subtype = data["bds09"].get_type()
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if subtype == 0:
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[velocity, heading, vert_spd, turnrate] = self.parseBDS09_0(data)
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retstr = "INSERT INTO vectors (icao, seen, speed, heading, vertical) VALUES (" + "%i" % icao24 + ", datetime('now'), " + "%.0f" % velocity + ", " + "%.0f" % heading + ", " + "%.0f" % vert_spd + ")"
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elif subtype == 1:
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[velocity, heading, vert_spd] = self.parseBDS09_1(data)
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retstr = "INSERT INTO vectors (icao, seen, speed, heading, vertical) VALUES (" + "%i" % icao24 + ", datetime('now'), " + "%.0f" % velocity + ", " + "%.0f" % heading + ", " + "%.0f" % vert_spd + ")"
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else:
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retstr = None
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return retstr
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