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compiler_vm: refactor vm_server
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Pragmatic Software
parent
c488b912d2
commit
85b9aaddf8
@ -37,12 +37,10 @@ sub vm_revert() {
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print "Reverted.\n";
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}
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sub execute($cmdline) {
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print "execute ($cmdline)\n";
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sub execute($command) {
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print "execute ($command)\n";
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my @list = split / /, $cmdline;
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my $pid = open(my $fh, '-|', @list);
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my $pid = open(my $fh, '-|', split / /, $command);
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if (not defined $pid) {
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print "Couldn't fork: $!\n";
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@ -60,7 +58,6 @@ sub execute($cmdline) {
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}
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my $ret = $? >> 8;
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print "result ($ret, $result)\n";
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return ($ret, $result);
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};
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@ -68,12 +65,12 @@ sub execute($cmdline) {
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alarm 0;
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if (my $exception = $@) {
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print "Got exception [$exception]\n";
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# handle time-out exception
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if ($exception =~ /Timed-out: (.*)/) {
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return (-13, "[Timed-out] $1");
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}
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# propagate unhandled exception
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die $exception;
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}
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@ -116,131 +113,127 @@ sub server_listen($port) {
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Reuse => 1,
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);
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die "Can't setup server: $!" unless $server;
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print "[Server $0 accepting clients at :$port]\n";
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print "Server $0 accepting clients at :$port\n";
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return $server;
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}
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sub handle_client($client, $heartbeat) {
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my ($timed_out, $killed) = (0, 0);
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eval {
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# give client 5 seconds to send a line
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local $SIG{ALRM} = sub { die "Client I/O timed-out\n"; };
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alarm 5;
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while (my $line = <$client>) {
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$line =~ s/[\r\n]+$//;
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next if $line =~ m/^\s*$/;
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# give client 5 more seconds
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alarm 5;
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print "Read [$line]\n";
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if (time - $heartbeat > 5) {
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print "Lost heartbeat, ignoring compile attempt.\n";
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print $client "Recovering from previous snippet, try again soon.\n";
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last;
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}
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# disable client time-out
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alarm 0;
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my ($ret, $result) = execute("perl vm-exec $line");
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$result =~ s/\s+$//;
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print "Ret: $ret; result: [$result]\n";
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if ($result =~ m/\[Killed\]$/) {
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$killed = 1;
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$ret = -14;
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}
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if ($ret == -13 && $result =~ m/\[Timed-out\]/) {
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$timed_out = 1;
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}
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print $client $result . "\n";
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last;
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}
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};
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# print client time-out exception
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print "$@" if $@;
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alarm 0;
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close $client;
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print "timed out: $timed_out; killed: $killed\n";
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return $timed_out || $killed;
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}
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use constant SUCCESS => 0;
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sub do_heartbeat() {
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tie my $heartbeat, 'IPC::Shareable', { key => 'heartbeat' };
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tie my $running, 'IPC::Shareable', { key => 'running' };
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my $heartbeat_monitor = connect_to_heartbeat() || die "No heartbeat.\n";
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while ($running and <$heartbeat_monitor>) {
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$heartbeat = time;
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}
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$heartbeat = 0;
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exit;
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}
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sub do_server() {
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tie my $heartbeat, 'IPC::Shareable', { key => 'heartbeat' };
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tie my $running, 'IPC::Shareable', { key => 'running' };
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print "Starting PBot VM Server on port " . SERVER_PORT . "\n";
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my $server = eval { server_listen(SERVER_PORT) };
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if ($@) {
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print STDERR $@;
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$running = 0;
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return;
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}
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while ($running and my $client = $server->accept) {
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$client->autoflush(1);
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my $hostinfo = gethostbyaddr($client->peeraddr);
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print '-' x 20, "\n";
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printf "Connect from %s at %s\n", $client->peerhost, scalar localtime;
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if (handle_client($client, $heartbeat) != SUCCESS) {
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vm_revert();
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}
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}
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print "Shutting down server.\n";
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}
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sub main() {
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my $heartbeat;
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my $running;
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tie my $heartbeat, 'IPC::Shareable', { key => 'heartbeat', create => 1, destroy => 1 };
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tie my $running, 'IPC::Shareable', { key => 'running', create => 1, destroy => 1 };
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tie $heartbeat, 'IPC::Shareable', 'dat1', { create => 1 };
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tie $running, 'IPC::Shareable', 'dat2', { create => 1 };
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$running = 1;
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$running = 1;
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$heartbeat = 0;
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my $heartbeat_pid = fork // die "Heartbeat fork failed: $!";
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if ($heartbeat_pid == 0) {
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# heartbeat
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tie $heartbeat, 'IPC::Shareable', 'dat1', { create => 1 };
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tie $running, 'IPC::Shareable', 'dat2', { create => 1 };
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my $heartbeat_monitor = connect_to_heartbeat() || die "Could not start heartbeat.\n";
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print "heartbeat: running: $running\n";
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while ($running and <$heartbeat_monitor>) {
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$heartbeat = time;
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}
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print "Stopping heartbeat...\n";
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$heartbeat = 0;
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exit;
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do_heartbeat();
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} else {
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# server
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print "Starting compiler server on port " . SERVER_PORT . "\n";
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my $server = eval { server_listen(SERVER_PORT) };
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if ($@) {
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print STDERR $@;
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$running = 0;
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}
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print "server: running: $running\n";
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while ($running and my $client = $server->accept) {
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$client->autoflush(1);
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my $hostinfo = gethostbyaddr($client->peeraddr);
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print '-' x 20, "\n";
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printf "[Connect from %s at %s]\n", $client->peerhost, scalar localtime;
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my ($timed_out, $killed) = (0, 0);
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eval {
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# give client 5 seconds to send a line
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local $SIG{ALRM} = sub { die 'client I/O timed-out'; };
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alarm 5;
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while (my $line = <$client>) {
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$line =~ s/[\r\n]+$//;
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next if $line =~ m/^\s*$/;
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# give client 5 more seconds
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alarm 5;
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print "got: [$line]\n";
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if (time - $heartbeat > 5) {
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print "Lost heartbeat, ignoring compile attempt.\n";
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print $client "Recovering from previous snippet, try again soon.\n";
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last;
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}
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print "Attempting compile...\n";
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# disable client time-out
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alarm 0;
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my ($ret, $result) = execute("perl vm-exec $line");
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if(not defined $ret) {
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#print "parent continued\n";
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print "parent continued [$result]\n";
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$timed_out = 1 if $result == 243 or $result == -13; # -13 == 243
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$killed = 1 if $result == 242 or $result == -14; # -14 = 242
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last;
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}
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$result =~ s/\s+$//;
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print "Ret: $ret; result: [$result]\n";
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if($result =~ m/\[Killed\]$/) {
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print "Process was killed\n";
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$killed = 1;
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}
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print $client $result . "\n";
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$ret = -14 if $killed;
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last;
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}
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alarm 0;
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};
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alarm 0;
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close $client;
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if (my $exception = $@) {
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print "Got exception: $@\n";
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}
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print "timed out: $timed_out; killed: $killed\n";
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next unless $timed_out || $killed;
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vm_revert();
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}
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print "Shutting down server.\n";
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do_server();
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}
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print "Waiting for heart to stop...\n";
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waitpid($heartbeat_pid, 0);
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print "Heart stopped.\n";
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}
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main();
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