Plack::Middleware::ServerStatus::Lite - show server status like Apache's mod_status

use Plack::Builder;

builder {
    enable "Plack::Middleware::ServerStatus::Lite",
        path => '/server-status',
        allow => [ '127.0.0.1', '192.168.0.0/16' ],
        counter_file => '/tmp/counter_file',
        scoreboard => '/var/run/server';
    $app;
};

% curl http://server:port/server-status
Uptime: 1234567789
Total Accesses: 123
BusyWorkers: 2
IdleWorkers: 3
--
pid status remote_addr host method uri protocol ss
20060 A 127.0.0.1 localhost:10001 GET / HTTP/1.1 1
20061 .
20062 A 127.0.0.1 localhost:10001 GET /server-status HTTP/1.1 0
20063 .
20064 .

# JSON format
% curl http://server:port/server-status?json
{"Uptime":"1332476669","BusyWorkers":"2",
 "stats":[
   {"protocol":null,"remote_addr":null,"pid":"78639",
    "status":".","method":null,"uri":null,"host":null,"ss":null},
   {"protocol":"HTTP/1.1","remote_addr":"127.0.0.1","pid":"78640",
    "status":"A","method":"GET","uri":"/","host":"localhost:10226","ss":0},
   ...
],"IdleWorkers":"3"}

Plack::Middleware::ServerStatus::Lite is a middleware that display server status in multiprocess Plack servers such as Starman and Starlet. This middleware changes status only before and after executing the application. so cannot monitor keepalive session and network i/o wait.

• path

    path => '/server-status',
  

  location that displays server status

• allow

    allow => '127.0.0.1'
    allow => ['192.168.0.0/16', '10.0.0.0/8']
  

  host based access control of a page of server status. supports IPv6 address.

• scoreboard

    scoreboard => '/path/to/dir'
  

  Scoreboard directory, Middleware::ServerStatus::Lite stores processes activity information in

• counter_file

    counter_file => '/path/to/counter_file'
  

  Enable Total Access counter

• skip_ps_command

    skip_ps_command => 1 or 0
  

  ServerStatus::Lite executes `ps command` to find all worker processes. But in some systems that does not mount "/proc" can not find any processes. IF 'skip_ps_command' is true, ServerStatus::Lite does not `ps`, and checks only processes that already did process requests.

The largest integer that 32-bit Perl can store without loss of precision is 2**53. So rather than getting all fancy with Math::BigInt, we're just going to be conservative and wrap that around to 0. That's enough to count 1 GB per second for a hundred days.

Seconds since beginning of most recent request

Masahiro Nagano <kazeburo {at} gmail.com>

Original ServerStatus by cho45 http://github.com/cho45/Plack-Middleware-ServerStatus

Plack::Middleware::ServerStatus::Tiny

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.