Temp commit while adding a modes_report class using named tuples. Mlat server definitely broken as a result.

apps/mlat_server

@@ -43,29 +43,6 @@ import bisect
 pickle_prot = 0
 #pickle_prot = pickle.HIGHEST_PROTOCOL
 
-class stamp:
-    def __init__(self, clientinfo, secs, frac_secs):
-        self.clientinfo = clientinfo
-        self.secs = secs
-        self.frac_secs = frac_secs
-    def __lt__(self, other):
-        if self.secs == other.secs:
-            return self.frac_secs < other.frac_secs
-        else:
-            return self.secs < other.secs
-    def __gt__(self, other):
-        if self.secs == other.secs:
-            return self.frac_secs > other.frac_secs
-        else:
-            return self.secs > other.secs
-    def __eq__(self, other):
-        return self.secs == other.secs and self.frac_secs == other.frac_secs
-    def __ne__(self, other):
-        return self.secs != other.secs or self.frac_secs != other.frac_secs
-    #good to within ms for comparison
-    def tofloat(self):
-        return self.secs + self.frac_secs
-
 def ordered_insert(a, item):
     a.insert(bisect.bisect_right(a, item), item)
 

apps/modes_rx

@@ -27,6 +27,8 @@ from optparse import OptionParser
 import time, os, sys, threading
 from string import split, join
 import air_modes
+from air_modes.types import modes_report, stamp
+from air_modes.parse import modes_reply
 import gnuradio.gr.gr_threading as _threading
 import csv
 from air_modes.exceptions import *
@@ -240,9 +242,12 @@ if __name__ == '__main__':
       if not queue.empty_p() :
         while not queue.empty_p() :
           msg = queue.delete_head() #blocking read
+          [data, ecc, reference, timestamp_int, timestamp_frac] = msg.to_string().split()
+          #error handling? creating a modes_reply can throw NoHandlerError, but you really want that to be handled by the output plugin in question.
+          msg_tuple = modes_report(modes_reply(long(data, 16)), long(ecc, 16), float(reference), stamp(int(timestamp_int), float(timestamp_frac)))
           for out in outputs:
             try:
-              out(msg.to_string())
+              out(msg_tuple)
             except air_modes.ADSBError:
               pass
 

python/CMakeLists.txt

@@ -46,6 +46,7 @@ GR_PYTHON_INSTALL(
     rx_path.py
     sbs1.py
     sql.py
+    types.py
     Quaternion.py
     DESTINATION ${GR_PYTHON_DIR}/air_modes
 )

python/__init__.py

@@ -61,6 +61,7 @@ from raw_server import raw_server
 from mlat_client import mlat_client
 from exceptions import *
 from az_map import *
+from types import *
 #this is try/excepted in case the user doesn't have numpy installed
 try:
     from flightgear import output_flightgear

python/flightgear.py

@@ -27,37 +27,34 @@ class output_flightgear(air_modes.parse):
         self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
         self.sock.connect((self.hostname, self.port))
 
-    def output(self, message):
-        [data, ecc, reference, timestamp_int, timestamp_frac] = message.split()
-        timestamp = int(timestamp_int) + float(timestamp_frac)
-        data = air_modes.modes_reply(long(data, 16))
+    def output(self, msg):
         
         try:
-            msgtype = data["df"]
+            msgtype = msg.data["df"]
             if msgtype == 17: #ADS-B report
-                icao24 = data["aa"]
-                bdsreg = data["me"].get_type()
+                icao24 = msg.data["aa"]
+                bdsreg = msg.data["me"].get_type()
                 if bdsreg == 0x08: #ident packet
-                    (ident, actype) = self.parseBDS08(data)
+                    (ident, actype) = self.parseBDS08(msg.data)
                     #select model based on actype
                     self.callsigns[icao24] = [ident, actype]
                     
                 elif bdsreg == 0x06: #BDS0,6 pos
-                    [ground_track, decoded_lat, decoded_lon, rnge, bearing] = self.parseBDS06(data)
+                    [ground_track, decoded_lat, decoded_lon, rnge, bearing] = self.parseBDS06(msg.data)
                     self.positions[icao24] = [decoded_lat, decoded_lon, 0]
                     self.update(icao24)
 
                 elif bdsreg == 0x05: #BDS0,5 pos
-                    [altitude, decoded_lat, decoded_lon, rnge, bearing] = self.parseBDS05(data)
+                    [altitude, decoded_lat, decoded_lon, rnge, bearing] = self.parseBDS05(msg.data)
                     self.positions[icao24] = [decoded_lat, decoded_lon, altitude]
                     self.update(icao24)
 
                 elif bdsreg == 0x09: #velocity
                     subtype = data["bds09"].get_type()
                     if subtype == 0:
-                      [velocity, heading, vert_spd, turnrate] = self.parseBDS09_0(data)
+                      [velocity, heading, vert_spd, turnrate] = self.parseBDS09_0(msg.data)
                     elif subtype == 1:
-                      [velocity, heading, vert_spd] = self.parseBDS09_1(data)
+                      [velocity, heading, vert_spd] = self.parseBDS09_1(msg.data)
                       turnrate = 0
                     else:
                         return

python/msprint.py

@@ -29,39 +29,33 @@ class output_print(air_modes.parse):
   def __init__(self, mypos):
       air_modes.parse.__init__(self, mypos)
       
-  def parse(self, message):
-    [data, ecc, reference, timestamp_int, timestamp_frac] = message.split()
-    timestamp = int(timestamp_int) + float(timestamp_frac)
+  def parse(self, msg):
 
-    ecc = long(ecc, 16)
-    reference = float(reference)
-
-    if reference == 0.0:
+    if msg.reference == 0.0:
       refdb = -150.0
     else:
-      refdb = 20.0*math.log10(reference)
-    output = "(%.0f %.10f) " % (refdb, timestamp);
+      refdb = 20.0*math.log10(msg.reference)
+    output = "(%.0f %.10f) " % (refdb, float(msg.timestamp));
 
     try:
-      data = air_modes.modes_reply(long(data, 16))
-      msgtype = data["df"]
+      msgtype = msg.data["df"]
       if msgtype == 0:
-        output += self.print0(data, ecc)
+        output += self.print0(msg.data, msg.ecc)
       elif msgtype == 4:
-        output += self.print4(data, ecc)
+        output += self.print4(msg.data, msg.ecc)
       elif msgtype == 5:
-        output += self.print5(data, ecc)
+        output += self.print5(msg.data, msg.ecc)
       elif msgtype == 11:
-        output += self.print11(data, ecc)
+        output += self.print11(msg.data, msg.ecc)
       elif msgtype == 17:
-        output += self.print17(data)
+        output += self.print17(msg.data)
       elif msgtype == 20 or msgtype == 21 or msgtype == 16:
-        output += self.printTCAS(data, ecc)
+        output += self.printTCAS(msg.data, msg.ecc)
       else:
-        output += "No handler for message type %i from %x (but it's in modes_parse)" % (msgtype, ecc)
+        output += "No handler for message type %i from %x (but it's in modes_parse)" % (msgtype, msg.ecc)
       return output
     except NoHandlerError as e:
-      output += "No handler for message type %s from %x" % (e.msgtype, ecc)
+      output += "No handler for message type %s from %x" % (e.msgtype, msg.ecc)
       return output
     except MetricAltError:
       pass

python/sbs1.py

@@ -100,27 +100,21 @@ class output_sbs1(air_modes.parse):
     else:
       return ",,,"
 
-  def parse(self, message):
+  def parse(self, msg):
     #assembles a SBS-1-style output string from the received message
-
-    [data, ecc, reference, timestamp_int, timestamp_frac] = message.split()
-    timestamp = int(timestamp_int) + float(timestamp_frac)
-
-    data = air_modes.modes_reply(long(data, 16))
-    ecc = long(ecc, 16)
-    msgtype = data["df"]
+    msgtype = msg.data["df"]
     outmsg = None
 
     if msgtype == 0:
-      outmsg = self.pp0(data, ecc)
+      outmsg = self.pp0(msg.data, msg.ecc)
     elif msgtype == 4:
-      outmsg = self.pp4(data, ecc)
+      outmsg = self.pp4(msg.data, msg.ecc)
     elif msgtype == 5:
-      outmsg = self.pp5(data, ecc)
+      outmsg = self.pp5(msg.data, msg.ecc)
     elif msgtype == 11:
-      outmsg = self.pp11(data, ecc)
+      outmsg = self.pp11(msg.data, msg.ecc)
     elif msgtype == 17:
-      outmsg = self.pp17(data)
+      outmsg = self.pp17(msg.data)
     else:
       raise NoHandlerError(msgtype)
     return outmsg

python/sql.py

@@ -86,21 +86,13 @@ class output_sql(air_modes.parse):
       except ADSBError:
         pass
 
-  def make_insert_query(self, message):
+  def make_insert_query(self, msg):
     #assembles a SQL query tailored to our database
     #this version ignores anything that isn't Type 17 for now, because we just don't care
-    [data, ecc, reference, timestamp_int, timestamp_frac] = message.split()
-    timestamp = int(timestamp_int) + float(timestamp_frac)
-
-    data = air_modes.modes_reply(long(data, 16))
-    ecc = long(ecc, 16)
-#   reference = float(reference)
-
-
     query = None
-    msgtype = data["df"]
+    msgtype = msg.data["df"]
     if msgtype == 17:
-      query = self.sql17(data)
+      query = self.sql17(msg.data)
 
     return query
 

python/types.py

@@ -0,0 +1,62 @@
+#
+# Copyright 2013 Nick Foster
+# 
+# This file is part of gr-air-modes
+# 
+# gr-air-modes is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+# 
+# gr-air-modes is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with gr-air-modes; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+from collections import namedtuple
+
+#this is a timestamp that preserves precision when used with UTC timestamps
+#ordinary double-precision timestamp would lose significant fractional precision
+#when the mantissa is as large as necessary for UTC timestamps.
+class stamp:
+    def __init__(self, secs, frac_secs):
+        self.secs = secs
+        self.frac_secs = frac_secs
+    def __lt__(self, other):
+        if self.secs == other.secs:
+            return self.frac_secs < other.frac_secs
+        else:
+            return self.secs < other.secs
+    def __gt__(self, other):
+        if self.secs == other.secs:
+            return self.frac_secs > other.frac_secs
+        else:
+            return self.secs > other.secs
+    def __eq__(self, other):
+        if isinstance(other, self.__class__):
+            return self.secs == other.secs and self.frac_secs == other.frac_secs
+        elif isinstance(other, float):
+            return float(self) == other
+        else:
+            raise TypeError
+    def __ne__(self, other):
+        return self.secs != other.secs or self.frac_secs != other.frac_secs
+    def __le__(self, other):
+        return (self == other) or (self < other)
+    def __ge__(self, other):
+        return (self == other) or (self > other)
+
+    #to ensure we don't hash by stamp
+    __hash__ = None
+    
+    #good to within ms for comparison
+    def __float__(self):
+        return self.secs + self.frac_secs
+
+modes_report = namedtuple('modes_report', ['data', 'ecc', 'reference', 'timestamp'])