Class: ClusterBomb::Cluster

Inherits:
Object
  • Object
show all
Includes:
Logging
Defined in:
lib/cluster_bomb/cluster.rb

Defined Under Namespace

Classes: Host

Constant Summary

Constants included from Logging

Logging::DEFAULT_LOGFILENAME

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Logging

log, log_disable, log_enable, log_init, puts, #puts

Constructor Details

#initialize(user, options = {}) ⇒ Cluster

Returns a new instance of Cluster.



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# File 'lib/cluster_bomb/cluster.rb', line 61

def initialize(user, options={})
  @user_name ||= user
  @connections=[]
  @hosts=[]
  @ssh_options=options
  @connection_mutex = Mutex.new
  @connected=false
  @connection_cache={}
  @nicknames={}
  @start_time =nil
  @max_time=nil
end

Instance Attribute Details

#hosts ⇒ Object

Returns the value of attribute hosts.



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# File 'lib/cluster_bomb/cluster.rb', line 60

def hosts
  @hosts
end

#nicknames ⇒ Object

Returns the value of attribute nicknames.



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# File 'lib/cluster_bomb/cluster.rb', line 60

def nicknames
  @nicknames
end

Instance Method Details

#clear! ⇒ Object 



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# File 'lib/cluster_bomb/cluster.rb', line 294

def clear!
  @hosts.each {|h| h.clear!}
end

#connect!(host_list) ⇒ Object 



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# File 'lib/cluster_bomb/cluster.rb', line 74

def connect!(host_list)
  return if host_list.empty?
  @hosts=[]
  # Build up results rray
  host_list.each {|hostname| @hosts << Host.new(hostname, self)}

  # Connect. Build up connections array
  # Seems like there would be an async call to do this -- but it looks like
  # Not -- so we resort to threads
  puts "Connecting to #{hosts.length} hosts"
  ensure_connected!
  @connected=true    
  puts "Connected to #{hosts.length} hosts"
end

#connected? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/cluster_bomb/cluster.rb', line 268

def connected?
  @connected
end

#credentials(user, ssh_opts) ⇒ Object

Credentials to be used for next connection attempt.



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# File 'lib/cluster_bomb/cluster.rb', line 90

def credentials(user, ssh_opts)
   @ssh_options=ssh_opts
   @user_name = user
end

#disconnect! ⇒ Object 



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# File 'lib/cluster_bomb/cluster.rb', line 272

def disconnect!
  if @connections
    @connection_cache.each do |k, conn|
      begin
        conn.close
      rescue Exception=>e
        puts "Non-fatal EXCEPTION closing connection: #{e.message}"
      end
    end
  end
  @hosts.each {|h| h.connected=false}
  @connections=[]
  @connection_cache={}
  @connected=false
  @hosts=[]
end

#download(remote, local, options = {}, &task) ⇒ Object 



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# File 'lib/cluster_bomb/cluster.rb', line 162

def download(remote, local, options={}, &task)
  ensure_connected!
  set_run_timer(options)
  @connections.each do |c|
    next if c[:connection].nil?
    c[:completed]=false      
    c[:connection].scp.download(remote,local)
  end
  event_loop(task)
  @hosts      
end

#ensure_connected! ⇒ Object

Be sure all hosts are connected that have not previously failed to connect



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# File 'lib/cluster_bomb/cluster.rb', line 96

def ensure_connected!      
  if @ssh_options[:timeout]
    total_timeout = @ssh_options[:timeout] * 2
  else
    total_timeout = 30
  end
  # puts "Total timeout: #{total_timeout}"
  @connections=[]
  hosts_to_connect = @hosts.inject(0) {|sum,h| sum += (h.connect_failed ? 0:1)}
  # puts "#{hosts_to_connect} to connect"
  @hosts.each do |host|
    if @connection_cache[host.name] || host.connected
      @connection_mutex.synchronize { @connections << {:connection=>@connection_cache[host.name], :host=>host} }
      host.connected=true
    elsif !host.connect_failed
      Thread.new {
        begin
          #puts "Connecting #{host.name}"
          name, port = host.name.split(':')
          port ||= "22"
          c = Net::SSH.start(name, @user_name, @ssh_options.merge({:port=>port.to_i}))
          @connection_cache[host.name] = c
          @connection_mutex.synchronize { @connections << {:connection=>c, :host=>host} }
          host.connected=true
          #puts "Connected #{host.name}"
        rescue Exception => e
          host.connect_failed = true
          host.connected=false
          error "Unable to connect to #{host.name}\n#{e.message}"
          @connection_mutex.synchronize {@connections << {:connection=>nil, :host=>host} }
          host.exception=e
        end        
      }
    end
  end
  s = Time.now
  loop do
    l=0
    @connection_mutex.synchronize { l = @connections.length }
    break if l == hosts_to_connect
    sleep(0.1)
    if Time.now - s > total_timeout
      puts "Warning -- total connection time expired"
      puts "Failed to connect:"
      hosts.each do |h|
        unless h.connected
          puts "    #{h.name}" 
          h.connect_failed=true
          # TODO: Need to handle this situations much better. Attempt to kill thread and/or mark connection in cache as unreachable
        end
      end
      break
    end
  end      
end

#error(msg) ⇒ Object 



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# File 'lib/cluster_bomb/cluster.rb', line 297

def error(msg)
  puts msg
end

#event_loop(task, options = {}) ⇒ Object 



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# File 'lib/cluster_bomb/cluster.rb', line 220

def event_loop(task, options={})
  # Event loop
  condition = Proc.new { |s| s.busy?(true) }
  # Count up non-nil connections
  count = 0
  @connections.each {|c| count +=1 if c[:connection]}
  loop do
    @connections.each do |conn|
      next if conn[:connection].nil? || conn[:completed]
      ex=nil
      busy=true
      begin
        busy = conn[:connection].process(0.1, &condition)
        if @start_time && Time.now - @start_time > @max_time
          # Soft exception here -- stay connected
          conn[:host].exception = Exception.new("Execution time exceeded: #{@max_time}")
          puts "Execution time exceeded: #{@max_time}"
          busy=false
        end
      rescue Exception => e
        # As far as I can tell, if we ever get here, the session is fucked. 
        # Close out the connection and indicate that we want to be reconnected later
        # In general, its upload/download exceptions that get us here. Even bad filenames can do the trick
        puts "#{e.message}"
        host = conn[:host]
        @connection_cache[host.name].close
        @connection_cache[host.name]=nil
        host.connected=false # disconnect
        busy=false
      end
      if !busy
        conn[:completed] = true
        count -=1 
        h = conn[:host]
        if task
          task.call(h)
        elsif options[:echo]
          puts "#{h.name}\n#{h.console}\n"
        end
      end
    end
    break if count <=0
  end
  # Reset these
  @start_time=nil
  @max_time = nil      
end

#mksudo(command) ⇒ Object

Build sudo-fied command. Really only works for bash afaik



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# File 'lib/cluster_bomb/cluster.rb', line 188

def mksudo(command)
  "sudo /bin/bash -c #{Shellwords.escape(command)}"
end

#reset! ⇒ Object 



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# File 'lib/cluster_bomb/cluster.rb', line 289

def reset!
  @connections=[]
  @connected=false  
end

#run(command, options = {}, &task) ⇒ Object 



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# File 'lib/cluster_bomb/cluster.rb', line 192

def run(command, options={}, &task)
  # Execute
  ensure_connected!
  if options[:sudo]
    command=mksudo(command)
  end      
  # puts "Command: #{command}"
  set_run_timer(options)      
  @connections.each do |c|
    next if c[:connection].nil?
    c[:completed]=false
    c[:host].clear! if options[:echo] # Clear out before starting
    c[:connection].exec command do |ch, stream, data|
      c[:host].buffer_console << data
      if stream == :stderr
        c[:host].buffer_stderr << data
      else
        "#{c[:host].name}=> #{data}"
        c[:host].buffer_stdout << data
      end
      puts "#{c[:host].name}::#{data}" if options[:debug]
      print "." if options[:dotty]
    end
  end
  event_loop(task, options)
  @hosts
end

#set_run_timer(options) ⇒ Object 



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# File 'lib/cluster_bomb/cluster.rb', line 152

def set_run_timer(options)
  if options[:max_run_time]
    @max_time = options[:max_run_time].to_i
    @start_time = Time.now
  else
    @max_time = nil
    @start_time = nil
  end
end

#upload(local, remote, options = {}, &task) ⇒ Object 



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# File 'lib/cluster_bomb/cluster.rb', line 174

def upload(local, remote, options={}, &task)
  opts={:chunk_size=>16384}.merge(options)
  ensure_connected!
  set_run_timer(options)      
  @connections.each do |c|
    next if c[:connection].nil?
    c[:completed]=false      
    c[:connection].scp.upload(local,remote, opts)
  end
  event_loop(task)
  @hosts      
end