package Msg;
-require Exporter;
-@ISA = qw(Exporter);
-
use strict;
use IO::Select;
use IO::Socket;
-use Carp;
+#use DXDebug;
-use vars qw (%rd_callbacks %wt_callbacks $rd_handles $wt_handles);
+use vars qw(%rd_callbacks %wt_callbacks $rd_handles $wt_handles $now @timerchain);
%rd_callbacks = ();
%wt_callbacks = ();
$rd_handles = IO::Select->new();
$wt_handles = IO::Select->new();
+$now = time;
+@timerchain = ();
+
my $blocking_supported = 0;
BEGIN {
$blocking_supported = 1 unless $@;
}
+#
+#-----------------------------------------------------------------
+# Generalised initializer
+
+sub new
+{
+ my ($pkg, $rproc) = @_;
+ my $obj = ref($pkg);
+ my $class = $obj || $pkg;
+
+ my $conn = {
+ rproc => $rproc,
+ inqueue => [],
+ state => 0,
+ lineend => "\r\n",
+ csort => 'telnet',
+ };
+
+ return bless $conn, $class;
+}
+
#-----------------------------------------------------------------
# Send side routines
sub connect {
- my ($pkg, $to_host, $to_port,$rcvd_notification_proc) = @_;
-
+ my ($pkg, $to_host, $to_port, $rproc) = @_;
+
# Create a new internet socket
-
my $sock = IO::Socket::INET->new (
PeerAddr => $to_host,
PeerPort => $to_port,
return undef unless $sock;
# Create a connection end-point object
- my $conn = {
- sock => $sock,
- rcvd_notification_proc => $rcvd_notification_proc,
- };
+ my $conn = $pkg;
+ unless (ref $pkg) {
+ $conn = $pkg->new($rproc);
+ }
+ $conn->{sock} = $sock;
- if ($rcvd_notification_proc) {
- my $callback = sub {_rcv($conn, 0)};
+ if ($conn->{rproc}) {
+ my $callback = sub {_rcv($conn)};
set_event_handler ($sock, "read" => $callback);
}
- return bless $conn, $pkg;
+ return $conn;
}
sub disconnect {
my $conn = shift;
my $sock = delete $conn->{sock};
- return unless defined($sock);
+ $conn->{state} = 'E';
+ delete $conn->{cmd};
+ $conn->{timeout}->del_timer if $conn->{timeout};
+ return unless defined($sock);
set_event_handler ($sock, "read" => undef, "write" => undef);
shutdown($sock, 3);
+ close($sock);
}
sub send_now {
my ($conn, $msg) = @_;
- _enqueue ($conn, $msg);
+ $conn->enqueue($msg);
$conn->_send (1); # 1 ==> flush
}
sub send_later {
my ($conn, $msg) = @_;
- _enqueue($conn, $msg);
+ $conn->enqueue($msg);
my $sock = $conn->{sock};
return unless defined($sock);
set_event_handler ($sock, "write" => sub {$conn->_send(0)});
}
-sub _enqueue {
- my ($conn, $msg) = @_;
- # prepend length (encoded as network long)
- my $len = length($msg);
- $msg = pack ('N', $len) . $msg;
- push (@{$conn->{queue}}, $msg);
+sub enqueue {
+ my $conn = shift;
+ push (@{$conn->{outqueue}}, $_[0]);
}
sub _send {
my ($conn, $flush) = @_;
my $sock = $conn->{sock};
return unless defined($sock);
- my ($rq) = $conn->{queue};
+ my ($rq) = $conn->{outqueue};
# If $flush is set, set the socket to blocking, and send all
# messages in the queue - return only if there's an error
while (@$rq) {
my $msg = $rq->[0];
- my $bytes_to_write = length($msg) - $offset;
+ my $mlth = length($msg);
+ my $bytes_to_write = $mlth - $offset;
my $bytes_written = 0;
- while ($bytes_to_write) {
+ confess("Negative Length! msg: '$msg' lth: $mlth offset: $offset") if $bytes_to_write < 0;
+ while ($bytes_to_write > 0) {
$bytes_written = syswrite ($sock, $msg,
$bytes_to_write, $offset);
if (!defined($bytes_written)) {
# be called back eventually, and will resume sending
return 1;
} else { # Uh, oh
+ delete $conn->{send_offset};
$conn->handle_send_err($!);
+ $conn->disconnect;
return 0; # fail. Message remains in queue ..
}
}
fcntl ($_[0], F_SETFL(), $flags);
}
}
+
sub handle_send_err {
# For more meaningful handling of send errors, subclass Msg and
# rebless $conn.
#-----------------------------------------------------------------
# Receive side routines
-my ($g_login_proc,$g_pkg);
-my $main_socket = 0;
sub new_server {
- @_ == 4 || die "Msg->new_server (myhost, myport, login_proc)\n";
+ @_ == 4 || die "Msg->new_server (myhost, myport, login_proc\n";
my ($pkg, $my_host, $my_port, $login_proc) = @_;
-
- $main_socket = IO::Socket::INET->new (
+ my $self = $pkg->new($login_proc);
+
+ $self->{sock} = IO::Socket::INET->new (
LocalAddr => $my_host,
LocalPort => $my_port,
Listen => 5,
Proto => 'tcp',
Reuse => 1);
- die "Could not create socket: $! \n" unless $main_socket;
- set_event_handler ($main_socket, "read" => \&_new_client);
- $g_login_proc = $login_proc; $g_pkg = $pkg;
+ die "Could not create socket: $! \n" unless $self->{sock};
+ set_event_handler ($self->{sock}, "read" => sub { $self->new_client } );
+ return $self;
}
-sub rcv_now {
- my ($conn) = @_;
- my ($msg, $err) = _rcv ($conn, 1); # 1 ==> rcv now
- return wantarray ? ($msg, $err) : $msg;
+sub dequeue
+{
+ my $conn = shift;
+ my $msg;
+
+ while ($msg = shift @{$conn->{inqueue}}){
+ &{$conn->{rproc}}($conn, $msg, $!);
+ $! = 0;
+ }
}
sub _rcv { # Complement to _send
- my ($conn, $rcv_now) = @_; # $rcv_now complement of $flush
+ my $conn = shift; # $rcv_now complement of $flush
# Find out how much has already been received, if at all
my ($msg, $offset, $bytes_to_read, $bytes_read);
my $sock = $conn->{sock};
return unless defined($sock);
- if (exists $conn->{msg}) {
- $msg = $conn->{msg};
- $offset = length($msg) - 1; # sysread appends to it.
- $bytes_to_read = $conn->{bytes_to_read};
- delete $conn->{'msg'}; # have made a copy
- } else {
- # The typical case ...
- $msg = ""; # Otherwise -w complains
- $offset = 0 ;
- $bytes_to_read = 0 ; # Will get set soon
- }
- # We want to read the message length in blocking mode. Quite
- # unlikely that we'll get blocked too long reading 4 bytes
- if (!$bytes_to_read) { # Get new length
- my $buf;
- $conn->set_blocking();
- $bytes_read = sysread($sock, $buf, 4);
- if ($! || ($bytes_read != 4)) {
- goto FINISH;
- }
- $bytes_to_read = unpack ('N', $buf);
- }
- $conn->set_non_blocking() unless $rcv_now;
- while ($bytes_to_read) {
- $bytes_read = sysread ($sock, $msg, $bytes_to_read, $offset);
- if (defined ($bytes_read)) {
- if ($bytes_read == 0) {
- last;
- }
- $bytes_to_read -= $bytes_read;
- $offset += $bytes_read;
- } else {
- if (_err_will_block($!)) {
- # Should come here only in non-blocking mode
- $conn->{msg} = $msg;
- $conn->{bytes_to_read} = $bytes_to_read;
- return ; # .. _rcv will be called later
- # when socket is readable again
- } else {
- last;
- }
- }
- }
- FINISH:
- if (length($msg) == 0) {
- $conn->disconnect();
+ my @lines;
+ $conn->set_non_blocking();
+ $bytes_read = sysread ($sock, $msg, 1024, 0);
+ if (defined ($bytes_read)) {
+ if ($bytes_read > 0) {
+ if ($msg =~ /\n/) {
+ @lines = split /\r?\n/, $msg;
+ push @lines, ' ' unless @lines;
+
+ $lines[0] = $conn->{msg} . $lines[0] if exists $conn->{msg};
+ if ($msg =~ /\n$/) {
+ delete $conn->{msg};
+ } else {
+ $conn->{msg} = pop @lines;
+ }
+ push @{$conn->{inqueue}}, @lines if @lines;
+ } else {
+ $conn->{msg} .= $msg;
+ }
+ }
+ } else {
+ if (_err_will_block($!)) {
+ return ;
+ } else {
+ $bytes_read = 0;
+ }
}
- if ($rcv_now) {
- return ($msg, $!);
+
+FINISH:
+ if (defined $bytes_read && $bytes_read == 0) {
+# $conn->disconnect();
+ &{$conn->{rproc}}($conn, undef, $!);
+ delete $conn->{inqueue};
} else {
- &{$conn->{rcvd_notification_proc}}($conn, $msg, $!);
- }
+ $conn->dequeue;
+ }
}
-sub _new_client {
- my $sock = $main_socket->accept();
- my $conn = bless {
- 'sock' => $sock,
- 'state' => 'connected'
- }, $g_pkg;
- my $rcvd_notification_proc =
- &$g_login_proc ($conn, $sock->peerhost(), $sock->peerport());
- if ($rcvd_notification_proc) {
- $conn->{rcvd_notification_proc} = $rcvd_notification_proc;
- my $callback = sub {_rcv($conn,0)};
+sub new_client {
+ my $server_conn = shift;
+ my $sock = $server_conn->{sock}->accept();
+ my $conn = $server_conn->new($server_conn->{rproc});
+ $conn->{sock} = $sock;
+ my $rproc = &{$server_conn->{rproc}} ($conn, $sock->peerhost(), $sock->peerport());
+ if ($rproc) {
+ $conn->{rproc} = $rproc;
+ my $callback = sub {_rcv($conn)};
set_event_handler ($sock, "read" => $callback);
} else { # Login failed
$conn->disconnect();
}
}
+sub close_server
+{
+ my $conn = shift;
+ set_event_handler ($conn->{sock}, "read" => undef);
+ $conn->{sock}->close;
+}
+
#----------------------------------------------------
# Event loop routines used by both client and server
}
}
+sub new_timer
+{
+ my ($pkg, $time, $proc, $recur) = @_;
+ my $obj = ref($pkg);
+ my $class = $obj || $pkg;
+ my $self = bless { t=>$time + time, proc=>$proc }, $class;
+ $self->{interval} = $time if $recur;
+ push @timerchain, $self;
+ return $self;
+}
+
+sub del_timer
+{
+ my $self = shift;
+ @timerchain = grep {$_ != $self} @timerchain;
+}
+
sub event_loop {
my ($pkg, $loop_count, $timeout) = @_; # event_loop(1) to process events once
my ($conn, $r, $w, $rset, $wset);
while (1) {
- # Quit the loop if no handles left to process
+
+ # Quit the loop if no handles left to process
last unless ($rd_handles->count() || $wt_handles->count());
- ($rset, $wset) =
+
+ ($rset, $wset) =
IO::Select->select ($rd_handles, $wt_handles, undef, $timeout);
+ $now = time;
+
foreach $r (@$rset) {
&{$rd_callbacks{$r}} ($r) if exists $rd_callbacks{$r};
}
foreach $w (@$wset) {
&{$wt_callbacks{$w}}($w) if exists $wt_callbacks{$w};
}
+
+ # handle things on the timer chain
+ for (@timerchain) {
+ if ($now >= $_->{t}) {
+ &{$_->{proc}}();
+ $_->{t} = $now + $_->{interval} if exists $_->{interval};
+ }
+ }
+
+ # remove dead timers
+ @timerchain = grep { $_->{t} > $now } @timerchain;
+
if (defined($loop_count)) {
last unless --$loop_count;
}
projects / spider.git / blobdiff