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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, socket, string
import gps
class Baton:
"Ship progress indication to stderr."
def __init__(self, prompt, endmsg=None):
self.stream = sys.stderr
self.stream.write(prompt + "... \010")
self.stream.flush()
self.count = 0
self.endmsg = endmsg
self.time = time.time()
return
def twirl(self, ch=None):
if self.stream is None:
return
if ch:
self.stream.write(ch)
else:
self.stream.write("-/|\\"[self.count % 4])
self.stream.write("\010")
self.count = self.count + 1
self.stream.flush()
return
def end(self, msg=None):
if msg == None:
msg = self.endmsg
if self.stream:
self.stream.write("...(%2.2f sec) %s.\n" % (time.time() - self.time, msg))
return
(options, arguments) = getopt.getopt(sys.argv[1:], "c:hlno:ps:v")
cycle = 1
speed = 4800
spawn = True
linedump = False
pipe = False
verbose = 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 == '-p'):
pipe = True
cycle = 0.1
elif (switch == '-s'):
speed = int(val)
elif (switch == '-v'):
verbose = True
elif (switch == '-h'):
sys.stderr.write("usage: gpsfake [-h] [-l] [-n] [-o options] [-p] [-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.
if not pipe or verbose:
sys.stderr.write("gpsfake: '%s' launch OK.\n" % spawncmd)
fp = open(pidfile)
pid = int(fp.read())
fp.close()
os.remove(pidfile)
def packet_get(fp):
"Grab a packet. Unlike the daemon's state machine, this assumes no noise."
first = fp.read(1)
if not first:
return None
elif first == '$': # NMEA packet
return "$" + fp.readline()
second = fp.read(1)
if first == '\xa0' and second == '\xa2': # SiRF packet
third = fp.read(1)
fourth = fp.read(1)
length = (ord(third) << 8) | ord(fourth)
return "\xa0\xa2" + third + fourth + fp.read(length+4)
else:
raise ValueError, "unknown packet type, leader %s, (0x%x)" % (first, ord(first))
try:
logfp = open(logfile, "r")
sentences = []
# Skip the comment header
while True:
first = logfp.read(1)
if first == "#":
logfp.readline()
else:
logfp.seek(-1, 1) # Must be a real file, not stdin
break
# Grab the packets
try:
while True:
packet = packet_get(logfp)
if not packet:
break
else:
sentences.append(packet)
except ValueError, msg:
sys.stderr.write(`msg` + "\n")
raise SystemExit, 1
# Look at the first packet to grok the GPS type
if sentences[0][0] == '$':
packtype = "NMEA"
legend = "gpsfake: line %d "
textual = 1
elif sentences[0][0] == '\xa0':
packtype = "SiRF-II binary"
legend = "gpsfake: packet %d"
textual = 0
else:
print "gpsfake: unknown log type (not NMEA or SiRF) can't handle it!"
sentences = None
if verbose:
sys.stderr.write("gpsfake: interpreting as %s packets\n" % packtype)
# Feed the daemon
if sentences:
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)
if pipe:
try:
session = gps.gps()
except socket.error:
sys.stderr.write("gpsfake: gpsd unreachable.\n")
raise SystemExit, 1
session.query("w+r+")
session.set_thread_hook(lambda x: sys.stdout.write(x))
baton = Baton("Processing %s" % logfile, "done")
try:
i = 0;
while True:
if i % len(sentences) == 0:
if pipe and i > 0:
break
if not pipe:
sys.stderr.write("gpsfake: log cycle begins.\n")
time.sleep(cycle)
if linedump:
if textual:
ml = sentences[i % len(sentences)].strip()
else:
ml = ""
print legend % (i % len(sentences) + 1) + ml
os.write(master_fd, sentences[i % len(sentences)])
if pipe:
baton.twirl()
if spawn:
try:
st = os.kill(pid, 0)
except OSError:
pid = 0
print "gpsfake: gpsd is gone."
break
i += 1
if pipe:
baton.end()
except KeyboardInterrupt:
pass
finally:
if spawn and pid:
os.kill(pid, signal.SIGTERM)
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