# -*- coding: utf-8 -*-
# Copyright (C) 2014 Rocky Bernstein <rocky@cpan.org>
# Debugger Input/Output FIFO client interface.
use warnings; use strict;
use rlib '../../..';
package Devel::Trepan::IO::FIFOClient;
use English qw ( -no_match_vars );
use POSIX qw(mkfifo);
use Fcntl;
use Devel::Trepan::IO::TCPPack;
use Devel::Trepan::Util qw(hash_merge);
our(@ISA);
use constant DEFAULT_INIT_OPTS => {
open => 1,
# input and output names are the reverse of the server
input_name => '/tmp/trepanpl.outputfifo',
input => undef,
input_mode => 0777,
output_name => '/tmp/trepanpl.inputfifo',
output => undef,
output_mode => 0777,
logger => undef, # Complaints should be sent here.
# name_pat pattern to go into tmpname
};
# attr_reader :state
sub open($;$);
sub new($;$)
{
my ($class, $opts) = @_;
$opts = hash_merge($opts, DEFAULT_INIT_OPTS);
my $self = {
addr => undef,
buf => '',
line_edit => 0, # Our name for GNU readline capability
input_name => $opts->{input_name},
input_mode => $opts->{input_mode},
output => undef,
output_name => $opts->{output_name},
output_mode => $opts->{output_mode},
state => 'uninit',
logger => $opts->{logger}
};
bless $self, $class;
$self->open($opts) if $opts->{open};
return $self;
}
sub is_interactive($) {
0
}
sub have_term_readline($)
{
return 0;
}
# Closes server connection.
# FIXME dry with FIFOClient by making a common FIFO routine
sub close
{
my $self = shift;
$self->{state} = 'closing';
foreach my $FIFO ( $self->{input}, $self->{output} ) {
close($FIFO);
}
$self->{state} = 'uninit';
$self->{input} = $self->{output} = undef;
print {$self->{logger}} "Disconnected FIFO client\n" if $self->{logger};
}
sub is_disconnected($)
{
my $self = shift;
return 'disconnected' eq $self->{state};
}
sub open($;$)
{
my ($self, $opts) = @_;
$opts = hash_merge($self, $opts);
foreach my $tuple ( [$opts->{input_name}, $opts->{input_mode}],
[$opts->{output_name}, $opts->{output_mode} ] ) {
my ($named_pipe, $create_mode) = @$tuple;
unless ( -p $named_pipe ) {
mkfifo($named_pipe, $create_mode)
or die "mkfifo($named_pipe) failed: $!";
}
}
sysopen($self->{output}, $self->{output_name}, O_NONBLOCK|O_RDWR) or
die "Can't open $self->{output_name} for writing: $!";
# Flush output as soon as possbile (autoflush).
my $oldfh = select($self->{output});
$OUTPUT_AUTOFLUSH = 1;
select($oldfh);
$self->{state} = 'listening';
}
# Read one message unit.
# EOFError will be raised on EOF.
sub read_msg($)
{
my($self) = @_;
unless ($self->{input}) {
sysopen($self->{input}, $self->{input_name}, O_RDONLY) or
die "Can't open $self->{input_name} for reading";
}
my $fh = $self->{input};
# print "+++ client self input ($self->{input_name}) ", $fh, "\n";
my $msg;
unless (eof($fh)) {
$msg = <$fh>;
return unpack_msg($msg) if $msg;
}
die "Remote has closed connection" if eof($fh);
}
# This method the debugger uses to write. In contrast to
# writeline, no newline is added to the end of to `str'. Also
# $msg doesn't have to be a string.
# FIXME dry with FIFOServer by making a common FIFO routine
sub write($$)
{
my($self, $msg) = @_;
# print "+++ client self output ($self->{output_name})\n";
syswrite($self->{output}, pack_msg($msg) . "\n");
}
# FIXME dry with FIFOServer by making a common FIFO routine
sub writeline($$)
{
my ($self, $msg) = @_;
$self->write($msg . "\n");
}
# Demo
unless (caller) {
if (scalar @ARGV) {
require Devel::Trepan::IO::FIFOServer;
my $pid = fork();
if ($pid) {
print "Client pid $$...\n";
my $client = __PACKAGE__-> new({'open' => 1});
print "client before read\n";
my $msg = $client->read_msg();
print "Client read from server message: $msg\n";
$client->writeline("client to server");
print "client before second read\n";
$msg = $client->read_msg();
print "Client read from server message: $msg\n";
print "Client $$ is done but waiting on server $pid\n";
waitpid($pid, 0);
$client->close();
print "Client is leaving\n";
} else {
print "Server pid $$...\n";
require Devel::Trepan::IO::FIFOServer;
my $server = Devel::Trepan::IO::FIFOServer->new();
print "server before write\n";
$server->writeline("server to client");
print "server before read\n";
my $msg = $server->read_msg();
print "Server read from client message: $msg\n";
print "server before second write\n";
$server->write("server to client nocr");
print "Server is leaving\n";
$server->close();
}
} else {
my $client = __PACKAGE__->new({'open' => 1});
$client->close();
}
}
1;