Class: Train::Transports::SSH::Connection

Inherits:
BaseConnection
  • Object
show all
Defined in:
lib/train/transports/ssh_connection.rb

Overview

A Connection instance can be generated and re-generated, given new connection details such as connection port, hostname, credentials, etc. This object is responsible for carrying out the actions on the remote host such as executing commands, transferring files, etc.

Author:

Defined Under Namespace

Classes: OS

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ Connection

rubocop:disable Metrics/ClassLength



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# File 'lib/train/transports/ssh_connection.rb', line 33

def initialize(options)
  super(options)
  @username               = @options.delete(:username)
  @hostname               = @options.delete(:hostname)
  @port                   = @options[:port] # don't delete from options
  @connection_retries     = @options.delete(:connection_retries)
  @connection_retry_sleep = @options.delete(:connection_retry_sleep)
  @max_wait_until_ready   = @options.delete(:max_wait_until_ready)
  @files                  = {}
  @session                = nil
  @transport_options      = @options.delete(:transport_options)
  @cmd_wrapper            = nil
  @cmd_wrapper            = CommandWrapper.load(self, @transport_options)
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/train/transports/ssh_connection.rb', line 49

def close
  return if @session.nil?
  logger.debug("[SSH] closing connection to #{self}")
  session.close
ensure
  @session = nil
end

#file(path) ⇒ Object 



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# File 'lib/train/transports/ssh_connection.rb', line 61

def file(path)
  @files[path] ||= \
    if os.aix?
      AixFile.new(self, path)
    elsif os.solaris?
      UnixFile.new(self, path)
    else
      LinuxFile.new(self, path)
    end
end

#login_command ⇒ Object 



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# File 'lib/train/transports/ssh_connection.rb', line 111

def 
  level = logger.debug? ? 'VERBOSE' : 'ERROR'
  fwd_agent = options[:forward_agent] ? 'yes' : 'no'

  args  = %w{ -o UserKnownHostsFile=/dev/null }
  args += %w{ -o StrictHostKeyChecking=no }
  args += %w{ -o IdentitiesOnly=yes } if options[:keys]
  args += %W( -o LogLevel=#{level} )
  args += %W( -o ForwardAgent=#{fwd_agent} ) if options.key?(:forward_agent)
  Array(options[:keys]).each do |ssh_key|
    args += %W( -i #{ssh_key} )
  end
  args += %W( -p #{@port} )
  args += %W( #{@username}@#{@hostname} )

  LoginCommand.new('ssh', args)
end

#os ⇒ Object 



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# File 'lib/train/transports/ssh_connection.rb', line 57

def os
  @os ||= OS.new(self)
end

#run_command(cmd) ⇒ Object 



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# File 'lib/train/transports/ssh_connection.rb', line 73

def run_command(cmd)
  stdout = stderr = ''
  exit_status = nil
  cmd.force_encoding('binary') if cmd.respond_to?(:force_encoding)
  logger.debug("[SSH] #{self} (#{cmd})")

  session.open_channel do |channel|
    # wrap commands if that is configured
    cmd = @cmd_wrapper.run(cmd) unless @cmd_wrapper.nil?

    channel.exec(cmd) do |_, success|
      abort 'Couldn\'t execute command on SSH.' unless success

      channel.on_data do |_, data|
        stdout += data
      end

      channel.on_extended_data do |_, _type, data|
        stderr += data
      end

      channel.on_request('exit-status') do |_, data|
        exit_status = data.read_long
      end

      channel.on_request('exit-signal') do |_, data|
        exit_status = data.read_long
      end
    end
  end
  @session.loop

  CommandResult.new(stdout, stderr, exit_status)
rescue Net::SSH::Exception => ex
  raise Train::Transports::SSHFailed, "SSH command failed (#{ex.message})"
end

#upload(locals, remote) ⇒ Object 



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# File 'lib/train/transports/ssh_connection.rb', line 130

def upload(locals, remote)
  Array(locals).each do |local|
    opts = File.directory?(local) ? { recursive: true } : {}

    session.scp.upload!(local, remote, opts) do |_ch, name, sent, total|
      logger.debug("Uploaded #{name} (#{total} bytes)") if sent == total
    end
  end
rescue Net::SSH::Exception => ex
  raise Train::Transports::SSHFailed, "SCP upload failed (#{ex.message})"
end

#wait_until_ready ⇒ Object 



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# File 'lib/train/transports/ssh_connection.rb', line 143

def wait_until_ready
  delay = 3
  session(
    retries: @max_wait_until_ready / delay,
    delay:   delay,
    message: "Waiting for SSH service on #{@hostname}:#{@port}, " \
             "retrying in #{delay} seconds",
  )
  execute(PING_COMMAND.dup)
end