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# frozen_string_literal: true
require 'puma/json'
module Puma
module App
# Check out {#call}'s source code to see what actions this web application
# can respond to.
class Status
OK_STATUS = '{ "status": "ok" }'.freeze
# @param launcher [::Puma::Launcher]
# @param token [String, nil] the token used for authentication
#
def initialize(launcher, token = nil)
@launcher = launcher
@auth_token = token
end
# most commands call methods in `::Puma::Launcher` based on command in
# `env['PATH_INFO']`
def call(env)
unless authenticate(env)
return rack_response(403, 'Invalid auth token', 'text/plain')
end
# resp_type is processed by following case statement, return
# is a number (status) or a string used as the body of a 200 response
resp_type =
case env['PATH_INFO'][/\/([^\/]+)$/, 1]
when 'stop'
@launcher.stop ; 200
when 'halt'
@launcher.halt ; 200
when 'restart'
@launcher.restart ; 200
when 'phased-restart'
@launcher.phased_restart ? 200 : 404
when 'reload-worker-directory'
@launcher.send(:reload_worker_directory) ? 200 : 404
when 'gc'
GC.start ; 200
when 'gc-stats'
Puma::JSON.generate GC.stat
when 'stats'
Puma::JSON.generate @launcher.stats
when 'thread-backtraces'
backtraces = []
@launcher.thread_status do |name, backtrace|
backtraces << { name: name, backtrace: backtrace }
end
Puma::JSON.generate backtraces
else
return rack_response(404, "Unsupported action", 'text/plain')
end
case resp_type
when String
rack_response 200, resp_type
when 200
rack_response 200, OK_STATUS
when 404
str = env['PATH_INFO'][/\/(\S+)/, 1].tr '-', '_'
rack_response 404, "{ \"error\": \"#{str} not available\" }"
end
end
private
def authenticate(env)
return true unless @auth_token
env['QUERY_STRING'].to_s.split(/&;/).include?("token=#{@auth_token}")
end
def rack_response(status, body, content_type='application/json')
headers = {
'Content-Type' => content_type,
'Content-Length' => body.bytesize.to_s
}
[status, headers, [body]]
end
end
end
end
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