Demonstrate how to enable postgres query logs for debugging

Author: michaelhixson

toolset/databases/postgres/postgresql.conf

@@ -291,7 +291,7 @@ synchronous_commit = off
 
 # - Where to Log -
 
-#log_destination = 'stderr'		# Valid values are combinations of
+log_destination = 'stderr'		# Valid values are combinations of
 					# stderr, csvlog, syslog, and eventlog,
 					# depending on platform.  csvlog
 					# requires logging_collector to be on.
@@ -392,7 +392,7 @@ synchronous_commit = off
 #log_duration = off
 #log_error_verbosity = default		# terse, default, or verbose messages
 #log_hostname = off
-log_line_prefix = '%t '			# special values:
+log_line_prefix = '%t %c %v %x '			# special values:
 					#   %a = application name
 					#   %u = user name
 					#   %d = database name
@@ -413,7 +413,7 @@ log_line_prefix = '%t '			# special values:
 					#   %% = '%'
 					# e.g. '<%u%%%d> '
 #log_lock_waits = off			# log lock waits >= deadlock_timeout
-#log_statement = 'none'			# none, ddl, mod, all
+log_statement = 'all'			# none, ddl, mod, all
 #log_temp_files = -1			# log temporary files equal or larger
 					# than the specified size in kilobytes;
 					# -1 disables, 0 logs all temp files

toolset/utils/docker_helper.py

@@ -281,6 +281,11 @@ def start_database(self, database):
         Sets up a container for the given database and port, and starts said docker
         container.
         '''
+
+        def watch_container(docker_container):
+            for line in docker_container.logs(stream=True):
+                print(line)
+
         image_name = "techempower/%s:latest" % database
         log_prefix = image_name + ": "
 
@@ -302,6 +307,12 @@ def start_database(self, database):
             remove=True,
             log_config={'type': None})
 
+        watch_thread = Thread(
+            target=watch_container,
+            args=[container])
+        watch_thread.daemon = True
+        watch_thread.start()
+
         # Sleep until the database accepts connections
         slept = 0
         max_sleep = 60