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#!/usr/bin/env python
#
# gpsfake -- test harness for gpsd
#
# Simulates a GPS, playing back a logfile
import sys, os, time, signal, pty, getopt, tempfile, termios
(options, arguments) = getopt.getopt(sys.argv[1:], "c:hlno:s:")
cycle = 1
speed = 4800
spawn = True
linedump = False
doptions = ""
for (switch, val) in options:
if (switch == '-c'):
cycle = float(val)
elif (switch == '-l'):
linedump = True
elif (switch == '-n'):
spawn = False
elif (switch == '-o'):
doptions = val
elif (switch == '-s'):
speed = int(val)
elif (switch == '-h'):
sys.stderr.write("usage: gpsfake [-h] [-l] [-n] [-o options] [-s speed] [-c cycle] logfile\n")
sys.exit(0)
logfile = arguments[0]
try:
(master_fd, slave_fd) = pty.openpty()
except:
sys.stderr.write("gpsfake: can't open pty.\n")
sys.exit(1)
slave = os.ttyname(slave_fd)
pidfile = "/tmp/gpsfake_pid-%s" % os.getpid()
spawncmd = "gpsd -N -P %s %s %s" % (pidfile, doptions, slave)
spawncmd = spawncmd.strip()
if not spawn:
raw_input("gpsfake: launch '%s' and press enter..." % spawncmd)
elif os.system(spawncmd + " &"):
sys.stderr.write("gpsfake: '%s' failed.\n" % spawncmd)
sys.exit(1)
else:
time.sleep(1) # Time for pidfile to get written.
sys.stderr.write("gpsfake: '%s' launch OK.\n" % spawncmd)
fp = open(pidfile)
pid = int(fp.read())
fp.close()
os.remove(pidfile)
try:
logfp = open(logfile, "r")
logdata = logfp.read()
logfp.close()
while logdata[0] == "#":
logdata = logdata[logdata.find('\n')+1:]
if logdata[0] == '$':
print "gpsfake: interpreting as NMEA"
leader = '$';
legend = "gpsfake: line %d "
textual = 1
elif logdata[0] == 0xa0:
print "gpsfake: interpreting as SiRF-II binary packets"
leader = 0xa0
legend = "gpsfake: packet %d"
textual = 0
else:
print "gpsfake: unknown log type, can't handle it!"
logdata = None
if logdata:
lines = map(lambda x: leader+x, logdata.split(leader)[1:])
ttyfp = open(slave, "rw")
raw = termios.tcgetattr(ttyfp.fileno())
raw[0] = 0 # iflag
raw[1] = termios.ONLCR # oflag
raw[2] &= ~(termios.PARENB | termios.CRTSCTS) # cflag
raw[2] |= (termios.CSIZE & termios.CS8) # cflag
raw[2] |= termios.CREAD | termios.CLOCAL # cflag
raw[3] = 0 # lflag
try:
raw[4] = raw[5] = eval("termios.B" + `speed`)
except AttributeError:
print "gpsfake: illegal baud rate."
sys.exit(1)
termios.tcsetattr(ttyfp.fileno(), termios.TCSANOW, raw)
try:
i = 0;
while True:
if i % len(lines) == 0:
print "gpsfake: log cycle begins."
time.sleep(cycle)
if linedump:
if textual:
ml = lines[i % len(lines)].strip()
else:
ml = ""
print legend % (i % len(lines) + 1) + ml
os.write(master_fd, lines[i % len(lines)])
if spawn:
try:
st = os.kill(pid, 0)
except OSError:
pid = 0
print "gpsfake: gpsd is gone."
break
i += 1
except KeyboardInterrupt:
pass
finally:
if spawn and (pid == 0 or os.kill(pid, 0) == 0):
os.kill(pid, signal.SIGTERM)
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