Better handling of lost DB connections.

* Added a sync call to Tools->nice_exit() to ensure logs are flushed.
* Updated Database->quote() to be in an eval block to better handle
  cases where the DB handle is lost.
* Added an hourly check to anvil-daemon and moved the memory in use
  check to run only once per hour.

Signed-off-by: digimer <mkelly@alteeve.ca>

Anvil/Tools.pm

@@ -428,6 +428,9 @@ sub nice_exit
 		$anvil->data->{HANDLE}{'log'}{main} = "";
 	}
 	
+	# Call a disk sync.
+	system($anvil->data->{path}{exe}{sync});
+	
 	#print "Exiting with RC: [".$exit_code."]\n";
 	exit($exit_code);
 }
@@ -1320,6 +1323,7 @@ sub _set_paths
 				su				=>	"/usr/bin/su",
 				'subscription-manager'		=>	"/usr/sbin/subscription-manager",
 				swapon				=>	"/usr/sbin/swapon",
+				sync				=>	"/usr/bin/sync",
 				sysctl				=>	"/usr/sbin/sysctl",
 				systemctl			=>	"/usr/bin/systemctl",
 				tail				=>	"/usr/bin/tail",

Anvil/Tools/Database.pm

@@ -17601,6 +17601,8 @@ sub query
 
 This quotes a string for safe use in database queries/writes. It operates exactly as C<< DBI >>'s C<< quote >> method. This method is simply a wrapper that uses the C<< DBI >> handle set as the currently active read database.
 
+If there is a problem, an empty string will be returned and an error will be logged and printed to STDOUT.
+
 Example;
 
  $anvil->Database->quote("foo");
@@ -17616,8 +17618,22 @@ sub quote
 	my $string = shift;
 	my $anvil  = $self->parent;
 	
-	   $string = "" if not defined $string;
+	$string = "" if not defined $string;
-	my $quoted = $anvil->Database->read->quote($string);
+	   
+	# Make sure we're using an active handle.
+	my $quoted = eval {$anvil->Database->read->quote($string); };
+	if ($@)
+	{
+		$quoted = "" if not defined $quoted;
+		$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 0, 'print' => 1, key => "warning_0177", variables => { 
+			string => $string,
+			error  => $@,
+		}});
+		
+		# Given this might be about to get used in a DB query, return nothing. That should cause 
+		# whatever query this was called for to error safely.
+		return("");
+	}
 	
 	return($quoted);
 }

Anvil/Tools/Log.pm

@@ -544,7 +544,10 @@ sub entry
 			
 			# The handle has to be wrapped in a block to make 'print' happy as it doesn't like non-scalars for file handles
 			print { $anvil->data->{HANDLE}{'log'}{alert} } $log_to_alert;
-			system('/usr/bin/sync');
+			
+			### NOTE: uncheck this is you have reason to think kernel buffering is preventing all
+			###       logs being flushed to disk. Obviously, this adds overhead.
+			#system('/usr/bin/sync');
 		}
 		$anvil->data->{loop}{count} = 0;
 	}

share/words.xml

@@ -4201,6 +4201,7 @@ We will try to proceed anyway.</key>
 		<key name="warning_0174">[ Warning ] - The fence method: [#!variable!method!#] already existed, proceeding.</key>
 		<key name="warning_0175">[ Warning ] - The DB query: [#!variable!query!#] timed out! It was given: [#!variable!timeout!#] seconds, and alarmed with: [#!variable!error!#].</key>
 		<key name="warning_0176">[ Warning ] - The DB query: [#!variable!query!#] failed with the error: [#!variable!error!#].</key>
+		<key name="warning_0177">[ Warning ] - SQL quoting string: [#!variable!string!#] failed with the error: [#!variable!error!#].</key>
 		
 	</language>
 	<!-- 日本語 -->

tools/anvil-daemon

@@ -173,21 +173,25 @@ my $delay = set_delay($anvil);
 # Once a day, we'll refresh an Install Target's RPM repository (has no effect on non-Striker dashboards).
 $anvil->data->{timing}{minute_checks}         = 60;
 $anvil->data->{timing}{ten_minute_checks}     = 600;
+$anvil->data->{timing}{hourly_checks}         = 3600;
 $anvil->data->{timing}{daily_checks}          = 86400;
 $anvil->data->{timing}{repo_update_interval}  = 86400;
 $anvil->data->{timing}{next_minute_check}     = $now_time - 1;
+$anvil->data->{timing}{next_hourly_check}     = $now_time - 1;
 $anvil->data->{timing}{next_ten_minute_check} = $now_time - 1;
 $anvil->data->{timing}{next_daily_check}      = ($now_time + $delay) - 1;
 $anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
-	"s1:timing::minute_checks"         => $anvil->data->{timing}{minute_checks}, 
+	"s01:timing::minute_checks"         => $anvil->data->{timing}{minute_checks}, 
-	"s2:timing::ten_minute_checks"     => $anvil->data->{timing}{ten_minute_checks}, 
+	"s02:timing::ten_minute_checks"     => $anvil->data->{timing}{ten_minute_checks}, 
-	"s3:timing::daily_checks"          => $anvil->data->{timing}{daily_checks}, 
+	"s03:timing::hourly_checks"         => $anvil->data->{timing}{hourly_checks}, 
-	"s4:timing::repo_update_interval"  => $anvil->data->{timing}{repo_update_interval}, 
+	"s04:timing::daily_checks"          => $anvil->data->{timing}{daily_checks}, 
-	"s5:now_time"                      => $now_time, 
+	"s05:timing::repo_update_interval"  => $anvil->data->{timing}{repo_update_interval}, 
-	"s6:delay"                         => $delay, 
+	"s06:now_time"                      => $now_time, 
-	"s7:timing::next_minute_check"     => $anvil->data->{timing}{next_minute_check}, 
+	"s07:delay"                         => $delay, 
-	"s8:timing::next_ten_minute_check" => $anvil->data->{timing}{next_ten_minute_check}, 
+	"s08:timing::next_minute_check"     => $anvil->data->{timing}{next_minute_check}, 
-	"s9:timing::next_daily_check"      => $anvil->data->{timing}{next_daily_check}, 
+	"s09:timing::next_ten_minute_check" => $anvil->data->{timing}{next_ten_minute_check}, 
+	"s10:timing::next_hourly_check"     => $anvil->data->{timing}{next_hourly_check}, 
+	"s11:timing::next_daily_check"      => $anvil->data->{timing}{next_daily_check}, 
 }});
 
 # Disconnect. We'll reconnect inside the loop
@@ -231,9 +235,6 @@ while(1)
 		$anvil->nice_exit({exit_code => 0});
 	}
 	
-	# Check how much RAM we're using.
-	check_ram($anvil);
-	
 	# Disconnect from the database(s) and sleep now.
 	$anvil->Database->disconnect();
 	sleep(2);
@@ -443,8 +444,9 @@ sub handle_periodic_tasks
 		"s1:now_time"                      => $now_time, 
 		"s2:timing::next_minute_check"     => $anvil->data->{timing}{next_minute_check}, 
 		"s3:timing::next_ten_minute_check" => $anvil->data->{timing}{next_ten_minute_check}, 
-		"s4:timing::next_daily_check"      => $anvil->data->{timing}{next_daily_check},
+		"s4:timing::next_hourly_check"     => $anvil->data->{timing}{next_hourly_check}, 
-		"s5:host_type"                     => $host_type,
+		"s5:timing::next_daily_check"      => $anvil->data->{timing}{next_daily_check},
+		"s6:host_type"                     => $host_type,
 	}});
 	
 	# Time to run once per minute tasks.
@@ -618,6 +620,20 @@ sub handle_periodic_tasks
 		}});
 	}
 	
+	# Now check to see if it's time to run hourly tasks.
+	if ($now_time >= $anvil->data->{timing}{next_hourly_check})
+	{
+		# Check how much RAM we're using.
+		check_ram($anvil);
+		
+		# Update the next check time.
+		$anvil->data->{timing}{next_hourly_check} = $now_time + $anvil->data->{timing}{hourly_checks};
+		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
+			"s1:timing::hourly_checks"     => $anvil->data->{timing}{hourly_checks},
+			"s2:timing::next_hourly_check" => $anvil->data->{timing}{next_hourly_check}, 
+		}});
+	}
+	
 	# Now check to see if it's time to run daily tasks.
 	if ($now_time >= $anvil->data->{timing}{next_daily_check})
 	{