Class: Beaker::SshConnection

Inherits:
Object
  • Object
show all
Defined in:
lib/beaker/ssh_connection.rb

Constant Summary collapse

RETRYABLE_EXCEPTIONS = 
[
  SocketError,
  Timeout::Error,
  Errno::ETIMEDOUT,
  Errno::EHOSTDOWN,
  Errno::EHOSTUNREACH,
  Errno::ECONNREFUSED,
  Errno::ECONNRESET,
  Errno::ENETUNREACH,
  Net::SSH::Disconnect,
  Net::SSH::AuthenticationFailed,
]

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(hostname, user = nil, ssh_opts = {}, options = {}) ⇒ SshConnection

Returns a new instance of SshConnection.



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# File 'lib/beaker/ssh_connection.rb', line 23

def initialize hostname, user = nil, ssh_opts = {}, options = {}
  @hostname = hostname
  @user = user
  @ssh_opts = ssh_opts
  @logger = options[:logger]
end

Instance Attribute Details

#logger ⇒ Object

Returns the value of attribute logger.



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# File 'lib/beaker/ssh_connection.rb', line 8

def logger
  @logger
end

Class Method Details

.connect(hostname, user = 'root', ssh_opts = {}, options = {}) ⇒ Object 



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# File 'lib/beaker/ssh_connection.rb', line 30

def self.connect hostname, user = 'root', ssh_opts = {}, options = {}
  connection = new hostname, user, ssh_opts, options
  connection.connect
  connection
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/beaker/ssh_connection.rb', line 60

def close
  begin
    @ssh.close if @ssh
  rescue
    @ssh.shutdown!
  end
  @ssh = nil
end

#connect ⇒ Object 



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# File 'lib/beaker/ssh_connection.rb', line 36

def connect
  try = 1
  last_wait = 0
  wait = 1
  @ssh ||= begin
             Net::SSH.start(@hostname, @user, @ssh_opts)
           rescue *RETRYABLE_EXCEPTIONS => e
             if try <= 11
               @logger.warn "Try #{try} -- Host #{@hostname} unreachable: #{e.message}"
               @logger.warn "Trying again in #{wait} seconds"
               sleep wait
              (last_wait, wait) = wait, last_wait + wait
               try += 1
               retry
             else
               # why is the logger not passed into this class?
               @logger.error "Failed to connect to #{@hostname}"
               raise
             end
           end
  @logger.debug "Created ssh connection to #{@hostname}, user: #{@user}, opts: #{@ssh_opts}"
  self
end

#execute(command, options = {}, stdout_callback = nil, stderr_callback = stdout_callback) ⇒ Object 



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# File 'lib/beaker/ssh_connection.rb', line 100

def execute command, options = {}, stdout_callback = nil,
            stderr_callback = stdout_callback
  attempt = true
  begin
    result = try_to_execute(command, options, stdout_callback, stderr_callback)
  rescue *RETRYABLE_EXCEPTIONS => e
    if attempt
      attempt = false
      @logger.error "Command execution failed, attempting to reconnect to #{@hostname}"
      close
      connect
      retry
    else
      raise
    end
  end

  result
end

#process_stdin_for(channel, stdin) ⇒ Object 



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# File 'lib/beaker/ssh_connection.rb', line 155

def process_stdin_for channel, stdin
  # queue stdin data, force it to packets, and signal eof: this
  # triggers action in many remote commands, notably including
  # 'puppet apply'.  It must be sent at some point before the rest
  # of the action.
  channel.send_data stdin.to_s
  channel.process
  channel.eof!
end

#register_exit_code_for(channel, output) ⇒ Object 



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# File 'lib/beaker/ssh_connection.rb', line 149

def register_exit_code_for channel, output
  channel.on_request("exit-status") do |ch, data|
    output.exit_code = data.read_long
  end
end

#register_stderr_for(channel, output, callback = nil) ⇒ Object 



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# File 'lib/beaker/ssh_connection.rb', line 139

def register_stderr_for channel, output, callback = nil
  channel.on_extended_data do |ch, type, data|
    if type == 1
      callback[data] if callback
      output.stderr << data
      output.output << data
    end
  end
end

#register_stdout_for(channel, output, callback = nil) ⇒ Object 



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# File 'lib/beaker/ssh_connection.rb', line 131

def register_stdout_for channel, output, callback = nil
  channel.on_data do |ch, data|
    callback[data] if callback
    output.stdout << data
    output.output << data
  end
end

#request_terminal_for(channel, command) ⇒ Object 



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# File 'lib/beaker/ssh_connection.rb', line 120

def request_terminal_for channel, command
  channel.request_pty do |ch, success|
    if success
      @logger.info "Allocated a PTY on #{@hostname} for #{command.inspect}"
    else
      abort "FAILED: could not allocate a pty when requested on " +
        "#{@hostname} for #{command.inspect}"
    end
  end
end

#scp_from(source, target, options = {}, dry_run = false) ⇒ Object 



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# File 'lib/beaker/ssh_connection.rb', line 184

def scp_from source, target, options = {}, dry_run = false
  return if dry_run

  options[:recursive] = true if options[:recursive].nil?

  @ssh.scp.download! source, target, options

  result = Result.new(@hostname, [source, target])

  # Setting these values allows reporting via result.log(test_name)
  result.stdout = "SCP'ed file #{@hostname}:#{source} to #{target}"

  # Net::Scp always returns 0, so just set the return code to 0.
  result.exit_code = 0

  result.finalize!
  result
end

#scp_to(source, target, options = {}, dry_run = false) ⇒ Object 



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# File 'lib/beaker/ssh_connection.rb', line 165

def scp_to source, target, options = {}, dry_run = false
  return if dry_run

  options[:recursive]=File.directory?(source) if options[:recursive].nil?

  @ssh.scp.upload! source, target, options

  result = Result.new(@hostname, [source, target])

  # Setting these values allows reporting via result.log(test_name)
  result.stdout = "SCP'ed file #{source} to #{@hostname}:#{target}"

  # Net::Scp always returns 0, so just set the return code to 0.
  result.exit_code = 0

  result.finalize!
  return result
end

#try_to_execute(command, options = {}, stdout_callback = nil, stderr_callback = stdout_callback) ⇒ Object 



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# File 'lib/beaker/ssh_connection.rb', line 69

def try_to_execute command, options = {}, stdout_callback = nil,
            stderr_callback = stdout_callback

  result = Result.new(@hostname, command)
  # why are we getting to this point on a dry run anyways?
  # also... the host creates connections through the class method,
  # which automatically connects, so you can't do a dry run unless you also
  # can connect to your hosts?
  return result if options[:dry_run]

  @ssh.open_channel do |channel|
    request_terminal_for( channel, command ) if options[:pty]

    channel.exec(command) do |terminal, success|
      abort "FAILED: to execute command on a new channel on #{@hostname}" unless success
      register_stdout_for terminal, result, stdout_callback
      register_stderr_for terminal, result, stderr_callback
      register_exit_code_for terminal, result

      process_stdin_for( terminal, options[:stdin] ) if options[:stdin]
    end
  end

  # Process SSH activity until we stop doing that - which is when our
  # channel is finished with...
  @ssh.loop

  result.finalize!
  result
end