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#!/usr/local/bin/ruby
def dispatcher_log(level, path,msg)
Logger.new(path).send(level, msg)
rescue Object => log_error
STDERR << "Couldn't write to #{path}: #{msg}"
end
def dispatcher_error(path,e,msg="")
error_message =
"[#{Time.now}] Dispatcher failed to catch: #{e} (#{e.class})\n #{e.backtrace.join("\n ")}\n#{msg}"
dispatcher_log(:error, path, error_message)
end
last_error_on = nil
begin
require File.dirname(__FILE__) + "/../config/environment"
require 'dispatcher'
require 'fcgi'
log_file_path = "#{RAILS_ROOT}/log/fastcgi.crash.log"
dispatcher_log(:info, log_file_path, "fcgi #{$$} starting")
# Allow graceful exits by sending the process SIGUSR1. If the process is
# currently handling a request, the request will be allowed to complete and
# then will terminate itself. If a request is not being handled, the
# process is terminated immediately (via #exit).
$please_exit_at_your_earliest_convenience = false
$i_am_currently_processing_a_request = false
trap("USR1") do
if $i_am_currently_processing_a_request
dispatcher_log(:info, log_file_path, "asking #{$$} to terminate ASAP")
$please_exit_at_your_earliest_convenience = true
else
dispatcher_log(:info, log_file_path, "telling #{$$} to terminate NOW")
exit
end
end
# Process each request as it comes in, as a pseudo-CGI.
FCGI.each_cgi do |cgi|
begin
$i_am_currently_processing_a_request = true
Dispatcher.dispatch(cgi)
rescue Object => e
dispatcher_error(log_file_path, e)
ensure
$stdout.flush
$i_am_currently_processing_a_request = false
break if $please_exit_at_your_earliest_convenience
end
end
dispatcher_log(:info, log_file_path, "fcgi #{$$} terminated gracefully")
rescue SystemExit => exit_error
dispatcher_log(:info, log_file_path, "fcgi #{$$} terminated by explicit exit")
rescue Object => fcgi_error
# retry on errors that would otherwise have terminated the FCGI process, but
# only if they occur more than 10 seconds apart.
if !(SignalException === fcgi_error) && (last_error_on.nil? || last_error_on - Time.now > 10)
last_error_on = Time.now
dispatcher_error(log_file_path, fcgi_error, "FCGI process #{$$} almost killed by this error\n")
retry
else
dispatcher_error(log_file_path, fcgi_error, "FCGI process #{$$} killed by this error\n")
end
end
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