adding log settings to send log messages to rsyslog

Change-Id: I8124a47ba6d2a24740cba58acd68c2c441687c18

analyticsdataserver/logsettings.py

+import os
+import platform
+import sys
+from logging.handlers import SysLogHandler
+
+
+def get_logger_config(log_dir='/var/tmp',
+                      logging_env="no_env",
+                      edx_filename="edx.log",
+                      dev_env=False,
+                      debug=False,
+                      local_loglevel='INFO',
+                      service_variant='analytics-api'):
+
+    """
+
+    Return the appropriate logging config dictionary. You should assign the
+    result of this to the LOGGING var in your settings.
+
+    If dev_env is set to true logging will not be done via local rsyslogd,
+    instead, application logs will be dropped in log_dir.
+
+    "edx_filename" is ignored unless dev_env is set to true since otherwise logging is handled by rsyslogd.
+
+    """
+
+    # Revert to INFO if an invalid string is passed in
+    if local_loglevel not in ['DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL']:
+        local_loglevel = 'INFO'
+
+    hostname = platform.node().split(".")[0]
+    syslog_format = ("[service_variant={service_variant}]"
+                     "[%(name)s][env:{logging_env}] %(levelname)s "
+                     "[{hostname}  %(process)d] [%(filename)s:%(lineno)d] "
+                     "- %(message)s").format(
+                        service_variant=service_variant,
+                        logging_env=logging_env, hostname=hostname)
+
+    if debug:
+        handlers = ['console']
+    else:
+        handlers = ['local']
+
+
+    logger_config = {
+        'version': 1,
+        'disable_existing_loggers': False,
+        'formatters': {
+            'standard': {
+                'format': '%(asctime)s %(levelname)s %(process)d '
+                          '[%(name)s] %(filename)s:%(lineno)d - %(message)s',
+            },
+            'syslog_format': {'format': syslog_format},
+            'raw': {'format': '%(message)s'},
+        },
+        'handlers': {
+            'console': {
+                'level': 'DEBUG' if debug else 'INFO',
+                'class': 'logging.StreamHandler',
+                'formatter': 'standard',
+                'stream': sys.stdout,
+            },
+        },
+        'loggers': {
+            'django': {
+                'handlers': handlers,
+                'propagate': True,
+                'level': 'INFO'
+            },
+            '': {
+                'handlers': handlers,
+                'level': 'DEBUG',
+                'propagate': False
+            },
+        }
+    }
+
+    if dev_env:
+        edx_file_loc = os.path.join(log_dir, edx_filename)
+        logger_config['handlers'].update({
+            'local': {
+                'class': 'logging.handlers.RotatingFileHandler',
+                'level': local_loglevel,
+                'formatter': 'standard',
+                'filename': edx_file_loc,
+                'maxBytes': 1024 * 1024 * 2,
+                'backupCount': 5,
+            },
+        })
+    else:
+        logger_config['handlers'].update({
+            'local': {
+                'level': local_loglevel,
+                'class': 'logging.handlers.SysLogHandler',
+                'address': '/dev/log',
+                'formatter': 'syslog_format',
+                'facility': SysLogHandler.LOG_LOCAL0,
+            },
+        })
+
+    return logger_config

analyticsdataserver/settings/production.py

@@ -4,12 +4,15 @@
 from os import environ
 from base import *
 import yaml
+from analyticsdataserver.logsettings import get_logger_config
 
 # Normally you should not import ANYTHING from Django directly
 # into your settings, but ImproperlyConfigured is an exception.
 from django.core.exceptions import ImproperlyConfigured
 
 
+LOGGING = get_logger_config()
+
 def get_env_setting(setting):
     """Get the environment setting or return exception."""
     try:
@@ -29,4 +32,3 @@ with open(CONFIG_FILE) as f:
   config_from_yaml = yaml.load(f)
 
 vars().update(config_from_yaml)
-