Class: Bcome::Ssh::ConnectionHandler

Inherits:
Object
  • Object
show all
Defined in:
lib/objects/ssh/connection_handler.rb

Constant Summary collapse

MAX_CONNECTION_ATTEMPTS = 
3

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(node, config = {}) ⇒ ConnectionHandler

Returns a new instance of ConnectionHandler.



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# File 'lib/objects/ssh/connection_handler.rb', line 12

def initialize(node, config = {})
  @node = node
  @config = config
  @servers_to_connect = machines.dup
  @connection_exceptions = {}
  reset_progress if show_progress?
end

Class Method Details

.connect(node, config = {}) ⇒ Object 



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# File 'lib/objects/ssh/connection_handler.rb', line 6

def connect(node, config = {})
  handler = new(node, config)
  handler.connect
end

Instance Method Details

#connect ⇒ Object 



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# File 'lib/objects/ssh/connection_handler.rb', line 40

def connect
  connection_attempt = 0
  ::Bcome::ProgressBar.instance.indicate(progress_bar_config, true) if show_progress?

  # So here we have a bit of a hack: If you're connecting to a network via a bastion host, it may not be able to handle over a certain amount of consecutive/parallelized ssh connection attempts
  # from bcome, so, we'll sweep up failures and re-try to connect up to MAX_CONNECTION_ATTEMPTS.  Once connected, we're generally good - and any subsequent connection failures
  # within a specific session will be handled ad-hoc and re-connection is automatic.
  while @servers_to_connect.any? && connection_attempt <= MAX_CONNECTION_ATTEMPTS
    puts "Retrying failed connections\n".warning if connection_attempt > 1
    do_connect
    connection_attempt += 1
  end

  if show_progress?
    ::Bcome::ProgressBar.instance.indicate(progress_bar_config, false)
    reset_progress
  end

  if ping?
    # If any machines remain, then we couldn't connect to them
    @servers_to_connect.each do |server|
      ping_result = {
        success: false,
        error: last_connection_exception_for(server)
      }
      puts server.print_ping_result(ping_result)
    end
  end

  if @servers_to_connect.any?
    puts "Failed to connect to #{@servers_to_connect.size} nodes".error
  else
    puts 'All nodes reachable   '.success
  end
end

#do_connect ⇒ Object 



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# File 'lib/objects/ssh/connection_handler.rb', line 80

def do_connect
  @servers_to_connect.pmap do |server|
    begin
      server.open_ssh_connection unless server.has_ssh_connection?
      Bcome::ProgressBar.instance.indicate_and_increment!(progress_bar_config, true) if show_progress?
      @servers_to_connect -= [server]
      puts server.print_ping_result if ping?
    rescue Exception => e
      @connection_exceptions[server] = e
    end
  end
end

#last_connection_exception_for(server) ⇒ Object 



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# File 'lib/objects/ssh/connection_handler.rb', line 76

def last_connection_exception_for(server)
  @connection_exceptions[server]
end

#machines ⇒ Object 



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# File 'lib/objects/ssh/connection_handler.rb', line 20

def machines
  @node.server? ? [@node] : @node.machines
end

#ping ⇒ Object 



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# File 'lib/objects/ssh/connection_handler.rb', line 36

def ping
  connect
end

#ping? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/objects/ssh/connection_handler.rb', line 28

def ping?
  @config[:is_ping] ? true : false
end

#progress_bar_config ⇒ Object 



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# File 'lib/objects/ssh/connection_handler.rb', line 93

def progress_bar_config
  {
    prefix: "\sOpening SSH connections\s",
    indice: '...',
    indice_descriptor: "of #{machines.size}"
  }
end

#reset_progress ⇒ Object 



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# File 'lib/objects/ssh/connection_handler.rb', line 32

def reset_progress
  ::Bcome::ProgressBar.instance.reset!
end

#show_progress? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/objects/ssh/connection_handler.rb', line 24

def show_progress?
  @config[:show_progress] ? true : false
end