14
GLOBAL_SIGNALS = SIGNALS.keys - %w(USR1)
16
attr_reader :when_ready
18
attr_accessor :log_file_path
19
attr_accessor :gc_request_period
21
# Initialize and run the FastCGI instance, passing arguments through to new.
22
def self.process!(*args, &block)
23
new(*args, &block).process!
26
# Initialize the FastCGI instance with the path to a crash log
27
# detailing unhandled exceptions (default RAILS_ROOT/log/fastcgi.crash.log)
28
# and the number of requests to process between garbage collection runs
29
# (default nil for normal GC behavior.) Optionally, pass a block which
30
# takes this instance as an argument for further configuration.
31
def initialize(log_file_path = nil, gc_request_period = nil)
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self.log_file_path = log_file_path || "#{RAILS_ROOT}/log/fastcgi.crash.log"
33
self.gc_request_period = gc_request_period
35
# Yield for additional configuration.
36
yield self if block_given?
38
# Safely install signal handlers.
39
install_signal_handlers
43
# Start error timestamp at 11 seconds ago.
44
@last_error_on = Time.now - 11
47
def process!(provider = FCGI)
50
dispatcher_log :info, 'starting'
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process_each_request provider
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dispatcher_log :info, 'stopping gracefully'
54
rescue Exception => error
57
dispatcher_log :info, 'stopping after explicit exit'
59
dispatcher_error error, 'stopping after unhandled signal'
61
# Retry if exceptions occur more than 10 seconds apart.
62
if Time.now - @last_error_on > 10
63
@last_error_on = Time.now
64
dispatcher_error error, 'retrying after unhandled exception'
67
dispatcher_error error, 'stopping after unhandled exception within 10 seconds of the last'
73
def process_each_request(provider)
77
provider.each do |request|
78
process_request(request)
84
close_connection(request)
87
close_connection(request)
92
rescue SignalException => signal
93
raise unless signal.message == 'SIGUSR1'
94
close_connection(request)
97
def process_request(request)
98
@processing, @when_ready = true, nil
101
with_signal_handler 'USR1' do
103
::Rack::Handler::FastCGI.serve(request, @app)
104
rescue SignalException, SystemExit
106
rescue Exception => error
107
dispatcher_error error, 'unhandled dispatch error'
115
@logger ||= Logger.new(@log_file_path)
118
def dispatcher_log(level, msg)
119
time_str = Time.now.strftime("%d/%b/%Y:%H:%M:%S")
120
logger.send(level, "[#{time_str} :: #{$$}] #{msg}")
121
rescue Exception => log_error # Logger errors
122
STDERR << "Couldn't write to #{@log_file_path.inspect}: #{msg}\n"
123
STDERR << " #{log_error.class}: #{log_error.message}\n"
126
def dispatcher_error(e, msg = "")
128
"Dispatcher failed to catch: #{e} (#{e.class})\n" +
129
" #{e.backtrace.join("\n ")}\n#{msg}"
130
dispatcher_log(:error, error_message)
133
def install_signal_handlers
134
GLOBAL_SIGNALS.each { |signal| install_signal_handler(signal) }
137
def install_signal_handler(signal, handler = nil)
138
if SIGNALS.include?(signal) && self.class.method_defined?(name = "#{SIGNALS[signal]}_handler")
139
handler ||= method(name).to_proc
142
trap(signal, handler)
144
dispatcher_log :warn, "Ignoring unsupported signal #{signal}."
147
dispatcher_log :warn, "Ignoring unsupported signal #{signal}."
151
def with_signal_handler(signal)
152
install_signal_handler(signal)
155
install_signal_handler(signal, 'DEFAULT')
158
def exit_now_handler(signal)
159
dispatcher_log :info, "asked to stop immediately"
163
def exit_handler(signal)
164
dispatcher_log :info, "asked to stop ASAP"
172
def reload_handler(signal)
173
dispatcher_log :info, "asked to reload ASAP"
175
@when_ready = :reload
181
def restart_handler(signal)
182
dispatcher_log :info, "asked to restart ASAP"
184
@when_ready = :restart
191
config = ::Config::CONFIG
192
ruby = File::join(config['bindir'], config['ruby_install_name']) + config['EXEEXT']
193
command_line = [ruby, $0, ARGV].flatten.join(' ')
195
dispatcher_log :info, "restarted"
197
# close resources as they won't be closed by
198
# the OS when using exec
199
logger.close rescue nil
200
Rails.logger.close rescue nil
206
run_gc! if gc_request_period
209
dispatcher_log :info, "reloaded"
212
# Make a note of $" so we can safely reload this instance.
219
Dispatcher.reset_application!
220
ActionController::Routing::Routes.reload
224
@gc_request_countdown = gc_request_period
225
GC.enable; GC.start; GC.disable
230
@gc_request_countdown ||= gc_request_period
231
@gc_request_countdown -= 1
232
run_gc! if @gc_request_countdown <= 0
236
def close_connection(request)
237
request.finish if request