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package Object::Remote::Logging::Router;
use Moo;
use Scalar::Util qw(weaken);
use Sys::Hostname;
with 'Log::Contextual::Role::Router';
with 'Object::Remote::Role::LogForwarder';
has _connections => ( is => 'ro', required => 1, default => sub { [] } );
has _remote_metadata => ( is => 'rw' );
sub before_import { }
sub after_import { }
sub _get_loggers {
my ($self, %metadata) = @_;
my $package = $metadata{caller_package};
my $level = $metadata{message_level};
my $is_level = "is_$level";
my $need_clean = 0;
my @loggers;
foreach my $selector (@{$self->_connections}) {
unless(defined $selector) {
$need_clean = 1;
next;
}
foreach my $logger ($selector->($package, { %metadata })) {
next unless defined $logger;
next unless $logger->$is_level;
push(@loggers, $logger);
}
}
$self->_clean_connections if $need_clean;
return @loggers;
}
#overloadable so a router can invoke a logger
#in a different way
sub _invoke_logger {
my ($self, $logger, $level_name, $content, $metadata) = @_;
#Invoking the logger like this gets all available data to the
#logging object with out losing any information from the datastructure.
#This is not a backwards compatible way to invoke the loggers
#but it enables a lot of flexibility in the logger.
#The l-c router could have this method invoke the logger in
#a backwards compatible way and router sub classes invoke
#it in non-backwards compatible ways if desired
$logger->$level_name($content, $metadata);
}
#overloadable so forwarding can have the updated
#metadata but does not have to wrap get_loggers
#which has too many drawbacks
sub _deliver_message {
my ($self, %message_info) = @_;
my @loggers = $self->_get_loggers(%message_info);
my $generator = $message_info{message_sub};
my $args = $message_info{message_args};
my $level = $message_info{message_level};
return unless @loggers > 0;
#this is the point where the user provided log message code block is executed
my @content = $generator->(@$args);
foreach my $logger (@loggers) {
$self->_invoke_logger($logger, $level, \@content, \%message_info);
}
}
sub handle_log_request {
my ($self, %message_info) = @_;
my $level = $message_info{message_level};
my $package = $message_info{caller_package};
my $need_clean = 0;
#caller_level is useless when log forwarding is in place
#so we won't tempt people with using it
my $caller_level = delete $message_info{caller_level};
$message_info{object_remote} = $self->_remote_metadata;
$message_info{timestamp} = time;
$message_info{pid} = $$;
$message_info{hostname} = hostname;
my @caller_info = caller($caller_level);
$message_info{filename} = $caller_info[1];
$message_info{line} = $caller_info[2];
@caller_info = caller($caller_level + 1);
$message_info{method} = $caller_info[3];
$message_info{method} =~ s/^${package}::// if defined $message_info{method};
$self->_deliver_message(%message_info);
}
sub connect {
my ($self, $destination, $is_weak) = @_;
my $wrapped;
if (ref($destination) ne 'CODE') {
$wrapped = sub { $destination };
} else {
$wrapped = $destination;
}
push(@{$self->_connections}, $wrapped);
weaken($self->_connections->[-1]) if $is_weak;
}
sub _clean_connections {
my ($self) = @_;
@{$self->{_connections}} = grep { defined } @{$self->{_connections}};
}
1;
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