From 9d31d7f18fed4d81dcbfa5fecb0c64fb0ba93bfe Mon Sep 17 00:00:00 2001
From: Ameya Vikram Singh <ameya.v.singh@gmail.com>
Date: Wed, 1 Nov 2017 23:29:38 +0530
Subject: [PATCH] Added initial Python Call tracer

Addedd a simple python function tracer.
To-Do:
  - Improve the performance for tracing application.
  - Create a generic script for plugging in any Python module.
---
 PythonTracer/README.md           |  8 +++++
 PythonTracer/testcov/__init__.py |  0
 PythonTracer/testcov/testfact.py | 16 +++++++++
 PythonTracer/tracer.py           | 56 ++++++++++++++++++++++++++++++++
 4 files changed, 80 insertions(+)
 create mode 100644 PythonTracer/README.md
 create mode 100644 PythonTracer/testcov/__init__.py
 create mode 100644 PythonTracer/testcov/testfact.py
 create mode 100644 PythonTracer/tracer.py

diff --git a/PythonTracer/README.md b/PythonTracer/README.md
new file mode 100644
index 0000000..14331a4
--- /dev/null
+++ b/PythonTracer/README.md
@@ -0,0 +1,8 @@
+# PythonTracer
+
+This directory consist of _prototype_ Python Call tracer.
+
+**Note:**
+1. This is a poor mans implementation not ready for everyday use!!!
+2. This implementation significantly slows down the execution speed.
+
diff --git a/PythonTracer/testcov/__init__.py b/PythonTracer/testcov/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/PythonTracer/testcov/testfact.py b/PythonTracer/testcov/testfact.py
new file mode 100644
index 0000000..239b01b
--- /dev/null
+++ b/PythonTracer/testcov/testfact.py
@@ -0,0 +1,16 @@
+#!/usr/bin/python
+
+from __future__ import print_function
+
+def fact(n):
+    if n == 0:
+        return 1
+    else:
+        return n*fact(n - 1)
+
+def main():
+    i = 20
+    print("fact(%d): %d" %(i, fact(i)))
+
+if __name__ == '__main__':
+    main()
diff --git a/PythonTracer/tracer.py b/PythonTracer/tracer.py
new file mode 100644
index 0000000..72fccbc
--- /dev/null
+++ b/PythonTracer/tracer.py
@@ -0,0 +1,56 @@
+#!/usr/bin/python
+
+# This file is looking into the python tracing support.
+
+#from __future__ import print_function
+
+import sys
+import threading
+import logging
+from testcov import testfact
+
+logger = None
+# Enable Logger
+logging.basicConfig(level = logging.DEBUG)
+logger = logging.getLogger(__name__)
+logger.propagate = False
+
+# Create file handler
+handler = logging.FileHandler(str(__file__) + '_tracing.log')
+handler.setLevel(logging.DEBUG)
+
+# Create a logging format
+formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
+handler.setFormatter(formatter)
+
+# Add the handlers to the logger
+logger.addHandler(handler)
+
+def profilefunc(frame, event, arg):
+    code = frame.f_code
+    #print("%s:%d:%s:%s" %(code.co_filename, frame.f_lineno, code.co_name, event))
+    # Logger doesn't work with multithreaded Python 2.x environment.
+    # It seems to be an issue with python internals.
+    # Logger seems to work under Python 3.6.1
+    if 'threading.py' not in code.co_filename.lower():
+        logger.debug("%s:%d:%s:%s" %(code.co_filename, frame.f_lineno, code.co_name, event))
+
+def fibo(n):
+    if n == 0:
+        return 0
+    elif n == 1:
+        return 1
+    else:
+        return fibo(n - 2) + fibo(n - 1)
+
+def main():
+    for i in range(0, 20):
+        print("fibo(%d): %d, fact(%d): %d" %(i, fibo(i), i, testfact.fact(i)))
+
+if __name__ == '__main__':
+    #threading.setprofile(profilefunc)
+    sys.setprofile(profilefunc)
+    logger.info('Start Logging')
+    main()
+    logger.info('Closing Logging')
+