MadMongers

Take a simple Dancer app:

  use Dancer;
  get '/hello/:name' => sub {
    return "Why, hello there " . param('name');
  };
  dance;


And then start it up with starman:

  /opt/wisc/perl/bin/starman test_app.psgi

  2012/06/22-11:18:39 Starman::Server (type Net::Server::PreFork) starting! pid(28723)
  Binding to TCP port 5000 on host *
  Setting gid to "10 10 10"


Then send the HUP signal:

  kill -HUP 28723


This happens the app:

  2012/06/22-11:19:40 Server closing!
  Sending children hup signal during HUP on prefork server
  2012/06/22-11:19:40 HUP'ing server
  2012/06/22-11:19:41 Starman::Server (type Net::Server::PreFork) starting! pid(28901)
  Binding open file descriptors
  Binding to TCP port 5000 on host *
  Setting gid to "10 10 10"
  Error while loading test_app.psgi: Cannot find current script 'starman master --port 5000 test_app.psgi' at /opt/wisc/perl-5.12.2/perl/lib/5.12.2/FindBin.pm line 205
  BEGIN failed--compilation aborted at /opt/wisc/perl-5.12.2/perl/lib/5.12.2/FindBin.pm line 205, <DATA> line 998.
  Compilation failed in require at /opt/wisc/perl-5.12.2/perl/lib/site_perl/5.12.2/Dancer/GetOpt.pm line 8, <DATA> line 998.
  BEGIN failed--compilation aborted at /opt/wisc/perl-5.12.2/perl/lib/site_perl/5.12.2/Dancer/GetOpt.pm line 8, <DATA> line 998.
  Compilation failed in require at /opt/wisc/perl-5.12.2/perl/lib/site_perl/5.12.2/Dancer.pm line 15, <DATA> line 998.
  BEGIN failed--compilation aborted at /opt/wisc/perl-5.12.2/perl/lib/site_perl/5.12.2/Dancer.pm line 15, <DATA> line 998.
  Compilation failed in require at test_app.psgi line 3, <DATA> line 998.
 BEGIN failed--compilation aborted at test_app.psgi line 3, <DATA> line 998


I verified that this does not happen with a normal psgi app such as:

  my $app = sub {
    my $env = shift;
    return [
      '200',
      [ 'Content-Type' => 'text/plain' ],
      [ "Hello World" ], # or IO::Handle-like object
    ];
  };


Notice this in the FindBin docs:

  https://metacpan.org/module/FindBin

  "KNOWN ISSUES ... FindBin uses a BEGIN block, it'll be executed only once, and only the first caller will get it right ... persistent Perl environments, where you shouldn't use this module ... Which also means that you should avoid using FindBin in modules that you plan to put on CPAN."

  doh!  I'm screwed because Dancer::GetOpt is using FindBin.


I tried adding this to test_app.psgi, which didn't fix it:



I tried capturing HUP signals.  No luck.

  $SIG{HUP} = sub { die "I got the HUP!" };


Anyone got any ideas how to shim in a fix for Dancer/Starman?  I'd be fine if Starman just killed itself on HUP, since I have this server wrapped with Solaris SMF, which will restart the server when it dies.

Otherwise, I could avoid using a pre-forking HTTP server (the HUP problem doesn't happen with 'plackup'), but I need the extra workers to handle the traffic.

Jesse