Adds logging to /var/log/syslog using rsyslog

Also adds a new test to test configure_logging function call.

securedrop_proxy/entrypoint.py

@@ -11,8 +11,9 @@
 import logging
 import os
 import sys
+import platform
 
-from logging.handlers import TimedRotatingFileHandler
+from logging.handlers import TimedRotatingFileHandler, SysLogHandler
 
 from securedrop_proxy import main
 from securedrop_proxy import proxy
@@ -83,7 +84,19 @@ def configure_logging() -> None:
     handler.setFormatter(formatter)
     handler.setLevel(logging.DEBUG)
 
+    # For rsyslog handler
+    if platform.system() != "Linux":  # pragma: no cover
+        syslog_file = "/var/run/syslog"
+    else:
+        syslog_file = "/dev/log"
+
+    sysloghandler = SysLogHandler(address=syslog_file)
+    sysloghandler.setFormatter(formatter)
+
     # set up primary log
     log = logging.getLogger()
     log.setLevel(LOGLEVEL)
     log.addHandler(handler)
+
+    # add the secondard logger
+    log.addHandler(sysloghandler)

tests/test_entrypoint.py

@@ -3,8 +3,10 @@
 import io
 import json
 import os
+import platform
 import tempfile
 import unittest.mock
+from unittest.mock import patch
 
 import vcr
 from securedrop_proxy import entrypoint
@@ -46,6 +48,22 @@ def test_missing_config(self):
             body["error"], "Configuration file does not exist at {}".format(config_path)
         )
 
+    @patch("securedrop_proxy.entrypoint.logging")
+    @patch("securedrop_proxy.entrypoint.SysLogHandler")
+    @patch("securedrop_proxy.entrypoint.TimedRotatingFileHandler")
+    def test_configure_logging(self, mock_log_conf, mock_log_conf_sys, mock_logging):
+        with sdhome() as homedir:
+            mock_log_file = os.path.join(homedir, 'logs', 'proxy.log')
+            entrypoint.configure_logging()
+            mock_log_conf.assert_called_once_with(mock_log_file)
+            # For rsyslog handler
+            if platform.system() != "Linux":  # pragma: no cover
+                syslog_file = "/var/run/syslog"
+            else:
+                syslog_file = "/dev/log"
+            mock_log_conf_sys.assert_called_once_with(address=syslog_file)
+            mock_logging.getLogger.assert_called_once_with()
+
     def test_unwritable_log_folder(self):
         """
         Tests a permission problem in `configure_logging`.