Class: Seesaw::Configure

Inherits:

Object

• Object
• Seesaw::Configure

Includes:

Mongrel::Command::Base, CommandBase

Defined in:

lib/seesaw/init.rb

Instance Method Summary

• #configure ⇒ Object
• #run ⇒ Object
• #validate ⇒ Object
• #write_config_include(file, ports) ⇒ Object

Methods included from CommandBase

#log, #parse_options, #restart_http, #restart_mongrels, #shutdown_half_cluster, #start_cluster, #start_mongrels, #stop_mongrels, #switch_to_half_cluster, #symlink

Instance Method Details

#configure ⇒ Object

# File 'lib/seesaw/init.rb', line 141

def configure 
  options [
    ['-N', '--num-servers INT', "Number of Mongrel servers", :@servers, 2],
    ['-C', '--config PATH', "Path to seesaw configuration file", :@config_file, 'config/seesaw.yml'],
    ['-M', '--mongrel PATH', "Path to mongrel cluster configuration file", :@mongrel_config_file, 'config/mongrel_cluster.yml'],
    ['', '--http_config PATH', "Path to the http server configuration includes", :@http_config_path, "config/http_cluster"],
    ['', '--server TYPE', "Webserver to generate example configuration for. TYPE can be nginx or apache. Default is apache.", :@server, 'apache']
  ]
end

#run ⇒ Object

# File 'lib/seesaw/init.rb', line 174

def run
  restart_cmds = {
    'nginx' => "sudo kill -HUP `cat /opt/local/var/log/nginx.pid`",
    'apache' => "sudo apachectl graceful"        
  }
  
  @options = {}
  
  @options["config_path"] = @http_config_path
  @options["restart_cmd"] = restart_cmds[@server]
  @options["symlink_cmd"] = "ln -sf"
  @options["config_symlink"] = "cluster.conf"
  @options["config_files"] = {}
  @options["config_files"]["all"] = "cluster_all.conf"
  @options["config_files"][1] = "cluster_1.conf"
  @options["config_files"][2] = "cluster_2.conf"      
  
  # write seesaw configuration
  log "Writing configuration file to #{@config_file}."
  File.open(@config_file,"w") {|f| f.write(@options.to_yaml)}
  
  # read mongrel cluster configuration to find number of servers
  mongrel_conf = YAML.load(File.read(@mongrel_config_file))
  
  # create cluster config directory if it doesn't exist
  Dir.mkdir(@http_config_path) unless File.exist?(@http_config_path)
  
  # write cluster configuration files for appropriate server
  start_port = mongrel_conf["port"].to_i 
  end_port = mongrel_conf["port"].to_i + mongrel_conf["servers"].to_i  - 1
  mid_port = ((end_port+start_port)/2.0).ceil
  
  # full cluster
  write_config_include(File.join(@http_config_path,@options["config_files"]["all"]), (start_port..end_port))
  
  # front half
  write_config_include(File.join(@http_config_path,@options["config_files"][1]), (start_port..mid_port-1))
  
  # back half
  write_config_include(File.join(@http_config_path,@options["config_files"][2]), (mid_port..end_port))
  
  # symlink
  system("#{@options["symlink_cmd"]} #{File.expand_path(File.join(@http_config_path,@options["config_files"]["all"]))} #{File.join(@http_config_path,@options["config_symlink"])}")
  
  log "Don't forget to include #{File.expand_path("#{@http_config_path}/cluster.conf")} in your webserver configuration."
end

#validate ⇒ Object

# File 'lib/seesaw/init.rb', line 151

def validate
  valid?(['nginx','apache'].include?(@server), "Server must be nginx or apache")
  valid_dir? File.dirname(@config_file), "Path to config file not valid: #{@config_file}"
  valid?(File.exist?(@mongrel_config_file), "Path to mongrel cluster config file not valid: #{@mongrel_config_file}")
  
  return @valid
end

#write_config_include(file, ports) ⇒ Object

# File 'lib/seesaw/init.rb', line 159

def write_config_include(file, ports)
  
  log "writing #{file}"
  
  ip = "127.0.0.1"
  server_lines = ""
  line_template = ERB.new(INCLUDES[@server][:server_line])
  ports.each do |port|
    server_lines << line_template.result(binding)
  end
  
  template = ERB.new(INCLUDES[@server][:template])
  File.open(file, "w") { |f| f.write(template.result(binding)) }
end