Add session_stats.py: a tool to perform some call time analysis on logs

diff --git a/plot/session_stats.py b/plot/session_stats.py
new file mode 100755 (executable)
index 0000000..2fc86c2
--- /dev/null
+++ b/plot/session_stats.py
@@ -0,0 +1,65 @@
+#!/usr/bin/env python3
+#
+# session_stats.py - gather stats about a SaveMySugar session
+#
+# Copyright (C) 2015  Antonio Ospite <ao2@ao2.it>
+#
+# This program 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 of the License, or
+# (at your option) any later version.
+#
+# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+import sys
+import logging
+
+
+def session_stats(transmitter_log_filename, receiver_log_filename):
+    transmitter_log = open(transmitter_log_filename)
+    receiver_log = open(receiver_log_filename)
+
+    transmitter_dial_times = []
+    for line in transmitter_log:
+        transmitter_dial_times.append(float(line.split(" ")[0]))
+
+    receiver_ring_times = []
+    for line in receiver_log:
+        receiver_ring_times.append(float(line.split(" ")[0]))
+
+    if len(transmitter_dial_times) != len(receiver_ring_times):
+        logging.error("The two files must contain the same number of lines")
+        sys.exit(1)
+
+    min_call_setup_time = 10000
+    max_call_setup_time = -1
+    for dial_time, ring_time in zip(transmitter_dial_times,
+                                    receiver_ring_times):
+        call_setup_time = ring_time - dial_time
+        max_call_setup_time = max(max_call_setup_time, call_setup_time)
+        min_call_setup_time = min(min_call_setup_time, call_setup_time)
+        logging.info("call setup time: %9.6f", call_setup_time)
+
+    return min_call_setup_time, max_call_setup_time
+
+
+def main():
+    if len(sys.argv) != 3:
+        print("usage: %s <transmit_log> <receive_log>" % sys.argv[0])
+        sys.exit(1)
+
+    call_setup_min, call_setup_max = session_stats(sys.argv[1], sys.argv[2])
+
+    print("\nSession stats:")
+    print("min call setup time: %9.6f" % call_setup_min)
+    print("max call setup time: %9.6f" % call_setup_max)
+
+
+if __name__ == "__main__":
+    main()