mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-28 03:18:41 +00:00
311 lines
9.0 KiB
Perl
311 lines
9.0 KiB
Perl
# -*- Mode: perl; tab-width: 4; indent-tabs-mode: nil; -*-
|
|
#
|
|
# This file is MPL/GPL dual-licensed under the following terms:
|
|
#
|
|
# The contents of this file are subject to the Mozilla Public License
|
|
# Version 1.1 (the "License"); you may not use this file except in
|
|
# compliance with the License. You may obtain a copy of the License at
|
|
# http://www.mozilla.org/MPL/
|
|
#
|
|
# Software distributed under the License is distributed on an "AS IS"
|
|
# basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
|
|
# the License for the specific language governing rights and
|
|
# limitations under the License.
|
|
#
|
|
# The Original Code is PLIF 1.0.
|
|
# The Initial Developer of the Original Code is Ian Hickson.
|
|
#
|
|
# Alternatively, the contents of this file may be used under the terms
|
|
# of the GNU General Public License Version 2 or later (the "GPL"), in
|
|
# which case the provisions of the GPL are applicable instead of those
|
|
# above. If you wish to allow use of your version of this file only
|
|
# under the terms of the GPL and not to allow others to use your
|
|
# version of this file under the MPL, indicate your decision by
|
|
# deleting the provisions above and replace them with the notice and
|
|
# other provisions required by the GPL. If you do not delete the
|
|
# provisions above, a recipient may use your version of this file
|
|
# under either the MPL or the GPL.
|
|
|
|
package PLIF;
|
|
use strict; # require strict adherence to perl standards
|
|
use vars qw($AUTOLOAD); # it's a package global
|
|
use Carp qw(cluck confess); # stack trace versions of warn and die
|
|
my $DEBUG = 4; # level of warnings and dumps to print to STDERR (none go to user)
|
|
my $USER = 1; # level of errors to report to user (all go to STDERR)
|
|
my @FATAL = (); # a list of pointers to functions that want to report errors to the user
|
|
my $LOCKED = 0; # set to '1' while we are calling the error reporting code
|
|
1;
|
|
|
|
# PLIF = Program Logic Insulation Framework
|
|
|
|
# Levels are assumed to be something along the following:
|
|
# Things that should never come up during normal operation:
|
|
# 0 = total failure: e.g. no input or output devices
|
|
# 1 = fatal errors: e.g. missing databases, broken connections, out of disk space
|
|
# 2 = security: e.g. warnings about repeated cracking attempts
|
|
# 3 = non-fatal errors: e.g. propagation of eval() errors as warnings
|
|
# 4 = important warnings (e.g. unexpected but possibly legitimate lack of data)
|
|
#
|
|
# Useful debugging information:
|
|
# 5 = important events (e.g. application started)
|
|
# 6 = debugging remarks for the section currently under test
|
|
# 7 = typical checkpoints (e.g. someone tried to do some output)
|
|
# 8 = frequently hit typical checkpoints
|
|
# 9 = verbose debugging information
|
|
# 10 = ridiculously verbose debugging spam
|
|
#
|
|
# No code in CVS should do anything at level 6, it is reserved for
|
|
# personal debugging.
|
|
|
|
# Note. All of the methods described in this class except for the
|
|
# propertyGet, propertySet and propertyExists methods are class
|
|
# methods. You can call "$class->notImplemented" without a problem.
|
|
|
|
# provide a standard virtual constructor
|
|
# if already created, merely return $self
|
|
sub create {
|
|
my $class = shift;
|
|
if (ref($class)) {
|
|
return $class; # already created, return self
|
|
} else {
|
|
my $self = $class->bless(@_); # call our real constructor
|
|
$self->serviceInit(@_);
|
|
return $self;
|
|
}
|
|
}
|
|
|
|
# provide a constructor that always constructs a new copy of the
|
|
# class. This is used to create service instances.
|
|
sub serviceCreate {
|
|
my $class = shift;
|
|
if (ref($class)) {
|
|
$class = ref($class);
|
|
}
|
|
my $self = $class->bless(@_); # call our real constructor
|
|
$self->serviceInstanceInit(@_);
|
|
return $self;
|
|
}
|
|
|
|
sub init {} # stub for services
|
|
|
|
sub serviceInit {
|
|
my $self = shift;
|
|
$self->init(@_);
|
|
}
|
|
|
|
sub serviceInstanceInit {
|
|
my $self = shift;
|
|
$self->init(@_);
|
|
}
|
|
|
|
# provide a constructor that always constructs a new copy of the
|
|
# class. This is used by services that implement factories for objects
|
|
# implemented in the same class (e.g., session objects do this).
|
|
sub objectCreate {
|
|
my $class = shift;
|
|
if (ref($class)) {
|
|
$class = ref($class);
|
|
}
|
|
my $self = $class->bless(@_); # call our real constructor
|
|
$self->objectInit(@_);
|
|
return $self;
|
|
}
|
|
|
|
sub objectInit {} # stub for objects
|
|
|
|
# internals of create and objectCreate
|
|
sub bless {
|
|
my $class = shift;
|
|
my $self = {};
|
|
CORE::bless($self, $class);
|
|
return $self;
|
|
}
|
|
|
|
# provide method-like access for any scalars in $self
|
|
sub AUTOLOAD {
|
|
my $self = shift;
|
|
my $name = $AUTOLOAD;
|
|
$name =~ s/^.*://o; # strip fully-qualified portion
|
|
if ($self->propertyImpliedAccessAllowed($name)) {
|
|
if (scalar(@_) == 1) {
|
|
return $self->propertySet($name, @_);
|
|
} elsif (scalar(@_) == 0) {
|
|
if ($self->propertyExists($name)) {
|
|
return $self->propertyGet($name);
|
|
} else {
|
|
return $self->propertyGetUndefined($name);
|
|
}
|
|
}
|
|
}
|
|
$self->methodMissing($name, @_);
|
|
}
|
|
|
|
sub propertySet {
|
|
# this is not a class method
|
|
my $self = shift;
|
|
my($name, $value) = @_;
|
|
return $self->{$name} = $value;
|
|
}
|
|
|
|
sub propertyExists {
|
|
# this is not a class method
|
|
my $self = shift;
|
|
my($name) = @_;
|
|
$self->assert($name, 0, 'propertyExists() cannot be called without arguments');
|
|
return exists($self->{$name});
|
|
}
|
|
|
|
sub propertyImpliedAccessAllowed {
|
|
# this is not (supposed to be) a class method
|
|
# my $self = shift;
|
|
# my($name) = @_;
|
|
# $self->assert($name, 0, 'propertyImpliedAccessAllowed() cannot be called without arguments');
|
|
return 1;
|
|
}
|
|
|
|
sub propertyGet {
|
|
# this is not a class method
|
|
my $self = shift;
|
|
my($name) = @_;
|
|
return $self->{$name};
|
|
}
|
|
|
|
sub propertyGetUndefined {
|
|
return undef;
|
|
}
|
|
|
|
sub methodMissing {
|
|
my $self = shift;
|
|
my($method) = @_;
|
|
$self->error(0, "Internal Error: Tried to access non-existent method '$method' in object '$self'");
|
|
}
|
|
|
|
|
|
# DEBUGGING AIDS
|
|
|
|
sub dump {
|
|
my $self = shift;
|
|
my($level, @data) = @_;
|
|
if ($self->isAtDebugLevel($level)) {
|
|
foreach (@data) {
|
|
print STDERR "$0: ($level) $_\n";
|
|
}
|
|
}
|
|
}
|
|
|
|
sub warn {
|
|
my $self = shift;
|
|
my($level, @data) = @_;
|
|
if ($self->isAtDebugLevel($level)) {
|
|
$self->dump($level, ('-'x12).' Start of Warning Stack Trace '.('-'x12));
|
|
cluck(@data); # warn with stack trace
|
|
$self->dump($level, ('-'x12). ('-'x30) .('-'x12));
|
|
}
|
|
}
|
|
|
|
sub error {
|
|
my $self = shift;
|
|
my($level, @data) = @_;
|
|
$self->dump(9, "error raised: $data[0]");
|
|
if ($self->isAtUserLevel($level) and not $LOCKED) {
|
|
# XXX this gets called even in eval{} blocks
|
|
$LOCKED = 1;
|
|
$self->dump(10, 'calling @FATAL error handlers...');
|
|
foreach my $entry (@FATAL) {
|
|
eval {
|
|
&{$entry->[1]}(@data);
|
|
};
|
|
if ($@) {
|
|
$self->warn(3, 'Error occured during \@FATAL callback of object \''.($entry->[0])."': $@");
|
|
}
|
|
}
|
|
$self->dump(10, 'done calling @FATAL error handlers');
|
|
$LOCKED = 0;
|
|
}
|
|
confess(@data); # die with stack trace
|
|
}
|
|
|
|
# this should not be called with the @data containing a trailing dot
|
|
sub assert {
|
|
my $self = shift;
|
|
my($condition, $level, @data) = @_;
|
|
if (not $condition) {
|
|
$self->error($level, @data);
|
|
}
|
|
}
|
|
|
|
sub debug {
|
|
my $self = shift;
|
|
$self->dump(6, @_);
|
|
}
|
|
|
|
sub notImplemented {
|
|
my $self = shift;
|
|
$self->error(0, 'Internal Error: Method not implemented');
|
|
}
|
|
|
|
# returns true only if the argument is a debug level that is at least
|
|
# as important as the local value of $DEBUG.
|
|
sub isAtDebugLevel {
|
|
my $self = shift;
|
|
my($level) = @_;
|
|
return ($level <= $DEBUG);
|
|
}
|
|
|
|
# returns true only if the argument is a debug level that is at least
|
|
# as important as the local value of $USER.
|
|
sub isAtUserLevel {
|
|
my $self = shift;
|
|
my($level) = @_;
|
|
return ($level <= $USER);
|
|
}
|
|
|
|
# returns a reference to the $DEBUG variable for configuration
|
|
# purposes
|
|
sub getDebugLevel {
|
|
return \$DEBUG;
|
|
}
|
|
|
|
# returns a reference to the $USER variable for configuration purposes
|
|
sub getUserLevel {
|
|
return \$USER;
|
|
}
|
|
|
|
# returns a reference to the @FATAL variable for modules that have
|
|
# very exotic needs
|
|
sub getFatalHandlerList {
|
|
return \@FATAL;
|
|
}
|
|
|
|
# returns a reference to the $LOCKED variable for modules that which
|
|
# to block @FATAL reporting
|
|
sub getFatalHandlerLock {
|
|
return \$LOCKED;
|
|
}
|
|
|
|
# if you call this, make sure that you call the next function too,
|
|
# guarenteed, otherwise you will never be freed until the app dies.
|
|
# of course, if you _are_ the app then I guess it's ok...
|
|
sub enableErrorReporting {
|
|
my $self = shift;
|
|
push(@FATAL, [$self, sub { $self->fatalError(@_); }]);
|
|
}
|
|
|
|
sub disableErrorReporting {
|
|
my $self = shift;
|
|
my @OLDFATAL = @FATAL;
|
|
@FATAL = ();
|
|
foreach my $entry (@OLDFATAL) {
|
|
if ($entry->[0] != $self) {
|
|
push(@FATAL, $entry);
|
|
}
|
|
}
|
|
}
|
|
|
|
sub fatalError {} # stub
|
|
|
|
sub DESTROY {
|
|
my $self = shift;
|
|
$self->dump(10, "Called destructor of object $self...");
|
|
}
|