Class: StarlingServer::Runner

Inherits:
Object
  • Object
show all
Defined in:
lib/starling/server_runner.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Runner

Returns a new instance of Runner.



22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
 
# File 'lib/starling/server_runner.rb', line 22

def initialize
  @@instance = self
  parse_options

  @process = ProcessHelper.new(options[:logger], options[:pid_file], options[:user], options[:group])

  pid = @process.running?
  if pid
    STDERR.puts "There is already a Starling process running (pid #{pid}), exiting."
    exit(1)
  elsif pid.nil?
    STDERR.puts "Cleaning up stale pidfile at #{options[:pid_file]}."
  end

  start
end

Class Method Details

.run ⇒ Object 



14
15
16
 
# File 'lib/starling/server_runner.rb', line 14

def self.run
  new
end

.shutdown ⇒ Object 



18
19
20
 
# File 'lib/starling/server_runner.rb', line 18

def self.shutdown
  @@instance.shutdown
end

Instance Method Details

#drop_privileges ⇒ Object 



184
185
186
187
 
# File 'lib/starling/server_runner.rb', line 184

def drop_privileges
  Process::Sys.setgid(options[:group]) if options[:group]
  Process::Sys.setuid(options[:user]) if options[:user]
end

#load_config_file(filename) ⇒ Object 



39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
 
# File 'lib/starling/server_runner.rb', line 39

def load_config_file(filename)
  config = YAML.load(ERB.new(File.read(filename)).result)

  unless config.is_a?(Hash)
    STDERR.puts "Config file does not contain a hash: #{filename}, exiting."
    exit(1)
  end

  if config['starling'].nil?
    STDERR.puts "Missing starling section in config file: #{filename}, exiting."
    exit(1)
  end

  config['starling'].each do |key, value|
    # alias some keys
    case key
    when "queue_path" then key = "path"
    when "log_file" then key = "logger"
    end

    if %w(logger path pid_file).include?(key)
      value = File.expand_path(value)
    end

    options[key.to_sym] = value

    if options[:log_level].instance_of?(String)
      options[:log_level] = Logger.const_get(options[:log_level])
    end
  end
end

#parse_options ⇒ Object 



71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
 
# File 'lib/starling/server_runner.rb', line 71

def parse_options
  self.options = { :host => '127.0.0.1',
                   :port => 22122,
                   :path => File.join('', 'var', 'spool', 'starling'),
                   :log_level => Logger::INFO,
                   :daemonize => false,
                   :timeout => 0,
                   :pid_file => File.join('', 'var', 'run', 'starling.pid') }

  OptionParser.new do |opts|
    opts.summary_width = 25

    opts.banner = "Starling (#{StarlingServer::VERSION})\n\n",
                  "usage: starling [options...]\n",
                  "       starling --help\n",
                  "       starling --version\n"

    opts.separator ""
    opts.separator "Configuration:"

    opts.on("-f", "--config FILENAME",
            "Config file (yaml) to load") do |filename|
      load_config_file(filename)
    end

    opts.on("-q", "--queue_path PATH",
            :REQUIRED,
            "Path to store Starling queue logs", "(default: #{options[:path]})") do |queue_path|
      options[:path] = File.expand_path(queue_path)
    end

    opts.separator ""; opts.separator "Network:"

    opts.on("-hHOST", "--host HOST", "Interface on which to listen (default: #{options[:host]})") do |host|
      options[:host] = host
    end

    opts.on("-pHOST", "--port PORT", Integer, "TCP port on which to listen (default: #{options[:port]})") do |port|
      options[:port] = port
    end

    opts.separator ""; opts.separator "Process:"

    opts.on("-d", "Run as a daemon.") do
      options[:daemonize] = true
    end

    opts.on("-PFILE", "--pid FILENAME", "save PID in FILENAME when using -d option.", "(default: #{options[:pid_file]})") do |pid_file|
      options[:pid_file] = File.expand_path(pid_file)
    end

    opts.on("-u", "--user USER", "User to run as") do |user|
      options[:user] = user.to_i == 0 ? Etc.getpwnam(user).uid : user.to_i
    end

    opts.on("-gGROUP", "--group GROUP", "Group to run as") do |group|
      options[:group] = group.to_i == 0 ? Etc.getgrnam(group).gid : group.to_i
    end

    opts.separator ""; opts.separator "Logging:"

    opts.on("-L", "--log [FILE]", "Path to print debugging information.") do |log_path|
      options[:logger] = File.expand_path(log_path)
    end

    begin
      require 'syslog_logger'

      opts.on("-l", "--syslog CHANNEL", "Write logs to the syslog instead of a log file.") do |channel|
        options[:syslog_channel] = channel
      end
    rescue LoadError
    end

    opts.on("-v", "Increase logging verbosity (may be used multiple times).") do
      options[:log_level] -= 1
    end

    opts.on("-t", "--timeout [SECONDS]", Integer,
            "Time in seconds before disconnecting inactive clients (0 to disable).",
            "(default: #{options[:timeout]})") do |timeout|
      options[:timeout] = timeout
    end

    opts.separator ""; opts.separator "Miscellaneous:"

    opts.on_tail("-?", "--help", "Display this usage information.") do
      puts "#{opts}\n"
      exit
    end

    opts.on_tail("-V", "--version", "Print version number and exit.") do
      puts "Starling #{StarlingServer::VERSION}\n\n"
      exit
    end
  end.parse!
end

#setup_signal_traps ⇒ Object 



200
201
202
203
 
# File 'lib/starling/server_runner.rb', line 200

def setup_signal_traps
  Signal.trap("INT") { shutdown }
  Signal.trap("TERM") { shutdown }
end

#shutdown ⇒ Object 



189
190
191
192
193
194
195
196
197
198
 
# File 'lib/starling/server_runner.rb', line 189

def shutdown
  begin
    STDOUT.puts "Shutting down."
    StarlingServer::Base.logger.info "Shutting down."
    @server.stop
  rescue Object => e
    STDERR.puts "There was an error shutting down: #{e}"
    exit(70)
  end
end

#start ⇒ Object 



169
170
171
172
173
174
175
176
177
178
179
180
181
182
 
# File 'lib/starling/server_runner.rb', line 169

def start
  drop_privileges

  @process.daemonize if options[:daemonize]

  setup_signal_traps
  @process.write_pid_file

  STDOUT.puts "Starting at #{options[:host]}:#{options[:port]}."
  @server = StarlingServer::Base.new(options)
  @server.run

  @process.remove_pid_file
end