Initial replica set manager commit

test/tools/repl_set_manager.rb

@@ -0,0 +1,126 @@
+#!/usr/bin/ruby
+
+require 'rubygems'
+require 'mongo'
+
+class ReplSetManager
+
+  def initialize(opts={})
+    @start_port = opts[:start_port] || 30000
+    @name       = opts[:name] || 'replica-set-foo'
+    @count      = opts[:count] || 3
+    @host       = opts[:host]  || 'localhost'
+    @retries    = opts[:retries] || 60
+    @config     = {"_id" => @name, "members" => []}
+    @path       = File.join(File.expand_path(File.dirname(__FILE__)), "data")
+
+    @mongods   = {}
+  end
+
+  def start_set
+    puts "Starting a replica set with #{@count} nodes"
+
+    system("killall mongod")
+    @count.times do |n|
+      @mongods[n] ||= {}
+      @mongods[n]['db_path'] = get_path("rs-#{n}")
+      @mongods[n]['log_path'] = get_path("log-#{n}")
+      system("rm -rf #{@mongods[n]['db_path']}")
+      system("mkdir -p #{@mongods[n]['db_path']}")
+
+      @mongods[n]['port'] = @start_port + n
+      @mongods[n]['start'] = "mongod --replSet #{@name} --logpath '#{@mongods[n]['log_path']}' " +
+       " --dbpath #{@mongods[n]['db_path']} --port #{@mongods[n]['port']} --fork"
+
+      start(n)
+
+      member = {'_id' => n, 'host' => "#{@host}:#{@mongods[n]['port']}"}
+      if n == @count-1
+        @mongods[n]['arbiter'] = true
+        member['arbiterOnly'] = true
+      end
+
+      @config['members'] << member
+    end
+
+    p @mongods
+    init
+    ensure_up
+  end
+
+  def kill(node)
+    system("kill -2 #{@mongods[node]['pid']}")
+    @mongods[node]['up'] = false
+    sleep(1)
+  end
+
+  def start(node)
+    system(@mongods[node]['start'])
+    @mongods[node]['up'] = true
+    sleep(1)
+    @mongods[node]['pid'] = File.open(File.join(@mongods[node]['db_path'], 'mongod.lock')).read.strip
+  end
+  alias :restart :start
+
+  def ensure_up
+    @con = get_connection
+    p @con
+
+    attempt(Mongo::OperationFailure) do
+      status = @con['admin'].command({'replSetGetStatus' => 1})
+      p status
+      if status['members'].all? { |m| [1, 2, 7].include?(m['state']) }
+        puts "All members up!"
+        return
+      else
+        raise Mongo::OperationFailure
+      end
+    end
+  end
+
+  private
+
+  def init
+    get_connection
+
+    attempt(Mongo::OperationFailure) do
+      @con['admin'].command({'replSetInitiate' => @config})
+    end
+  end
+
+  def get_connection
+    attempt(Mongo::ConnectionFailure) do
+      node = @mongods.keys.detect {|key| !@mongods[key]['arbiter'] && @mongods[key]['up'] }
+      p @mongods[node]['port']
+      p node
+      @con = Mongo::Connection.new(@host, @mongods[node]['port'], :slave_ok => true)
+    end
+
+    return @con
+  end
+
+  def get_path(name)
+    p @path
+    j = File.join(@path, name)
+    p j
+    j
+  end
+
+  def attempt(exception)
+    raise "No block given!" unless block_given?
+    count = 0
+
+    while count < @retries do
+      begin
+        yield
+        return
+        rescue exception
+          sleep(1)
+          count += 1
+      end
+    end
+
+    raise exception
+  end
+
+end