add log module

src/log.py

@@ -0,0 +1,35 @@
+import logging
+import os
+from datetime import datetime
+
+class LOG(object):
+    logger = None
+    def __init__(self, log_dir):
+        if log_dir:
+            if not os.path.exists(log_dir):
+                os.makedirs(log_dir)
+            self.logger = logging.getLogger('simple-db-migrate')
+
+            now = datetime.now()
+            filename = "%s/%s.log" %(os.path.abspath(log_dir), now.strftime("%Y%m%d%H%M%S"))
+            hdlr = logging.FileHandler(filename)
+            formatter = logging.Formatter('%(message)s')
+            hdlr.setFormatter(formatter)
+            self.logger.addHandler(hdlr)
+            self.logger.setLevel(logging.DEBUG)
+
+    def debug(self, msg):
+        if self.logger:
+            self.logger.debug(msg)
+
+    def info(self, msg):
+        if self.logger:
+            self.logger.info(msg)
+
+    def error(self, msg):
+        if self.logger:
+            self.logger.error(msg)
+
+    def warn(self, msg):
+        if self.logger:
+            self.logger.warn(msg)