package Object::Remote::Role::Connector::PerlInterpreter;
-use IPC::Open2;
+use IPC::Open3;
+use IO::Handle;
+use Symbol;
+use Object::Remote::Logging qw(:log :dlog router);
use Object::Remote::ModuleSender;
use Object::Remote::Handle;
-use Scalar::Util qw(blessed);
+use Object::Remote::Future;
+use Scalar::Util qw(blessed weaken);
use Moo::Role;
with 'Object::Remote::Role::Connector';
has module_sender => (is => 'lazy');
+has ulimit => ( is => 'ro');
+has nice => ( is => 'ro');
+has watchdog_timeout => ( is => 'ro', required => 1, default => sub { undef });
+has perl_command => (is => 'lazy');
+has pid => (is => 'rwp');
+has connection_id => (is => 'rwp');
+
+#if no child_stderr file handle is specified then stderr
+#of the child will be connected to stderr of the parent
+has stderr => ( is => 'rw', default => sub { undef } );
+
+BEGIN { router()->exclude_forwarding; }
sub _build_module_sender {
my ($hook) =
return $hook ? $hook->sender : Object::Remote::ModuleSender->new;
}
+sub _build_perl_command {
+ my ($self) = @_;
+ my $nice = $self->nice;
+ my $ulimit = $self->ulimit;
+ my $perl_path = 'perl';
+ my $shell_code = '';
+
+ if (defined($ulimit)) {
+ $shell_code .= "ulimit $ulimit || exit 1; ";
+ }
+
+ if (defined($nice)) {
+ $shell_code .= "nice -n $nice ";
+ }
+
+ if (defined($ENV{OBJECT_REMOTE_PERL_BIN})) {
+ log_debug { "Using OBJECT_REMOTE_PERL_BIN environment variable as perl path" };
+ $perl_path = $ENV{OBJECT_REMOTE_PERL_BIN};
+ }
+
+ $shell_code .= $perl_path . ' -';
+
+ return [ 'bash', '-c', $shell_code ];
+}
+
around connect => sub {
my ($orig, $self) = (shift, shift);
- my $conn = $self->$orig(@_);
- Object::Remote::Handle->new(
- connection => $conn,
- class => 'Object::Remote::ModuleLoader',
- args => { module_sender => $self->module_sender }
- )->disarm_free;
- return $conn;
+ my $f = $self->$start::start($orig => @_);
+ return future {
+ $f->on_done(sub {
+ my ($conn) = $f->get;
+ $self->_setup_watchdog_reset($conn);
+ my $sub = $conn->remote_sub('Object::Remote::Logging::init_remote_logging');
+ $sub->('Object::Remote::Logging', router => router(), connection_id => $conn->_id);
+ Object::Remote::Handle->new(
+ connection => $conn,
+ class => 'Object::Remote::ModuleLoader',
+ args => { module_sender => $self->module_sender }
+ )->disarm_free;
+ require Object::Remote::Prompt;
+ Object::Remote::Prompt::maybe_set_prompt_command_on($conn);
+ });
+ $f;
+ } 2;
};
-sub _perl_command { 'perl', '-' }
+sub final_perl_command { shift->perl_command }
-sub _open2_for {
+sub _start_perl {
my $self = shift;
- my $pid = open2(
- my $foreign_stdout,
+ my $given_stderr = $self->stderr;
+ my $foreign_stderr;
+
+ Dlog_verbose {
+ s/\n/ /g; "invoking connection to perl interpreter using command line: $_"
+ } @{$self->final_perl_command};
+
+ if (defined($given_stderr)) {
+ #if the stderr data goes to an existing file handle
+ #an anonymous file handle is required
+ #as the other half of a pipe style file handle pair
+ #so the file handles can go into the run loop
+ $foreign_stderr = gensym();
+ } else {
+ #if no file handle has been specified
+ #for the child's stderr then connect
+ #the child stderr to the parent stderr
+ $foreign_stderr = ">&STDERR";
+ }
+
+ my $pid = open3(
my $foreign_stdin,
- $self->_perl_command(@_),
+ my $foreign_stdout,
+ $foreign_stderr,
+ @{$self->final_perl_command},
) or die "Failed to run perl at '$_[0]': $!";
- require Object::Remote::FatNode;
- print $foreign_stdin $Object::Remote::FatNode::DATA, "__END__\n"
- or die "Failed to send fatpacked data to new node on '$_[0]': $!";
+
+ $self->_set_pid($pid);
+
+ if (defined($given_stderr)) {
+ Dlog_debug { "Child process STDERR is being handled via run loop" };
+
+ Object::Remote->current_loop
+ ->watch_io(
+ handle => $foreign_stderr,
+ on_read_ready => sub {
+ my $buf = '';
+ my $len = sysread($foreign_stderr, $buf, 32768);
+ if (!defined($len) or $len == 0) {
+ log_trace { "Got EOF or error on child stderr, removing from watcher" };
+ $self->stderr(undef);
+ Object::Remote->current_loop->unwatch_io(
+ handle => $foreign_stderr,
+ on_read_ready => 1
+ );
+ } else {
+ Dlog_trace { "got $len characters of stderr data for connection" };
+ print $given_stderr $buf or die "could not send stderr data: $!";
+ }
+ }
+ );
+ }
+
+ return ($foreign_stdin, $foreign_stdout, $pid);
+}
+
+sub _open2_for {
+ my $self = shift;
+ my ($foreign_stdin, $foreign_stdout, $pid) = $self->_start_perl(@_);
+ my $to_send = $self->fatnode_text;
+ log_debug { my $len = length($to_send); "Sending contents of fat node to remote node; size is '$len' characters" };
+ Object::Remote->current_loop
+ ->watch_io(
+ handle => $foreign_stdin,
+ on_write_ready => sub {
+ my $len = syswrite($foreign_stdin, $to_send, 32768);
+ if (defined $len) {
+ substr($to_send, 0, $len) = '';
+ }
+ # if the stdin went away, we'll never get Shere
+ # so it's not a big deal to simply give up on !defined
+ if (!defined($len) or 0 == length($to_send)) {
+ log_trace { "Got EOF or error when writing fatnode data to filehandle, unwatching it" };
+ Object::Remote->current_loop
+ ->unwatch_io(
+ handle => $foreign_stdin,
+ on_write_ready => 1
+ );
+ } else {
+ log_trace { "Sent $len bytes of fatnode data to remote side" };
+ }
+ }
+ );
return ($foreign_stdin, $foreign_stdout, $pid);
}
+sub _setup_watchdog_reset {
+ my ($self, $conn) = @_;
+ my $timer_id;
+
+ return unless $self->watchdog_timeout;
+
+ Dlog_trace { "Creating Watchdog management timer for connection id $_" } $conn->_id;
+
+ weaken($conn);
+
+ $timer_id = Object::Remote->current_loop->watch_time(
+ every => $self->watchdog_timeout / 3,
+ code => sub {
+ unless(defined($conn)) {
+ log_warn { "Weak reference to connection in Watchdog was lost, terminating update timer $timer_id" };
+ Object::Remote->current_loop->unwatch_time($timer_id);
+ return;
+ }
+
+ unless($conn->is_valid) {
+ log_warn { "Watchdog timer found an invalid connection, removing the timer" };
+ Object::Remote->current_loop->unwatch_time($timer_id);
+ return;
+ }
+
+ Dlog_trace { "Reseting Watchdog for connection id $_" } $conn->_id;
+ #we do not want to block in the run loop so send the
+ #update off and ignore any result, we don't need it
+ #anyway
+ $conn->send_class_call(0, 'Object::Remote::WatchDog', 'reset');
+ }
+ );
+
+ $conn->on_close->on_ready(sub {
+ log_debug { "Removing watchdog for connection that is now closed" };
+ Object::Remote->current_loop->unwatch_time($timer_id);
+ });
+}
+
+sub fatnode_text {
+ my ($self) = @_;
+ my $connection_timeout = $self->timeout;
+ my $watchdog_timeout = $self->watchdog_timeout;
+ my $text = '';
+
+ require Object::Remote::FatNode;
+
+ if (defined($connection_timeout)) {
+ $text .= "alarm($connection_timeout);\n";
+ }
+
+ if (defined($watchdog_timeout)) {
+ $text .= "my \$WATCHDOG_TIMEOUT = $watchdog_timeout;\n";
+ } else {
+ $text .= "my \$WATCHDOG_TIMEOUT = undef;\n";
+ }
+
+ $text .= '$Object::Remote::FatNode::REMOTE_NODE = "1";' . "\n";
+
+ $text .= <<'END';
+$INC{'Object/Remote/FatNode.pm'} = __FILE__;
+$Object::Remote::FatNode::DATA = <<'ENDFAT';
+END
+ $text .= do { no warnings 'once'; $Object::Remote::FatNode::DATA };
+ $text .= "ENDFAT\n";
+ $text .= <<'END';
+eval $Object::Remote::FatNode::DATA;
+die $@ if $@;
+END
+
+ $text .= "__END__\n";
+ return $text;
+}
+
1;
projects / scpubgit/Object-Remote.git / blobdiff