Module: Expect4r

Included in:
Base, Ios, Iox, J, V
Defined in:
lib/expect4r.rb,
lib/expect/io.rb,
lib/misc/base.rb,
lib/misc/shell.rb,
lib/router/modes.rb

Defined Under Namespace

Modules: Router Classes: Base, BaseLoginObject, ConnectionError, ExpTimeoutError, Expect4rIO_Error, Ios, Iox, J, RShell, Shell, SpawnError, V

Instance Method Summary collapse

Instance Method Details

#_login(cmd = self.spawnee, arg = {}) ⇒ Object Also known as: login 



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# File 'lib/expect/io.rb', line 284

def (cmd=self.spawnee, arg={})
  
  return if connected?

  if arg[:proxy]
     cmd, arg
  else
    spawn cmd
  end

  arg={:timeout=>13, :no_echo=>false}.merge(arg)
  timeout = arg[:timeout]
  no_echo = arg[:no_echo]

  output=[]
  t0 = Time.now
  ev, buf = catch(:done) do
    @r.readbuf(timeout) do |read_pipe|
      if read_pipe._io_exit?
        exp_internal "readbuf: _io_exit?"
        throw :done, [ :cnx_error,  read_pipe._io_buf1]
      end
      
      @pre_matches ||= []
      @pre_matches.each do |match, _send|
        if read_pipe._io_string =~ match
          read_pipe._io_save no_echo, "match #{match}"
          if _send.is_a?(Proc)
            _send.call
          else
            exp_puts _send.to_s
          end
        end
      end
      
      case read_pipe._io_string
      when spawnee_prompt
        read_pipe._io_save no_echo, "match PROMPT"
        throw(:done, [:ok, read_pipe._io_buf1])
      when /Last (L|l)ogin:/
        read_pipe._io_save no_echo   # consumes 
      when /(user\s*name\s*|login):\s*$/i
        read_pipe._io_save no_echo, "match USERNAME"
        exp_puts spawnee_username
      when /password:\s*$/i
        read_pipe._io_save no_echo, "match PASSWORD"
        @w.print(spawnee_password+"\r") and flush
      when /Escape character is/
        read_pipe._io_save no_echo, "match Escape char"
        io_escape_char_cb
      when /.*\r\n/
        exp_internal "match EOL"
        read_pipe._io_save no_echo, "match EOL"
      when /Are you sure you want to continue connecting \(yes\/no\)\?/
        read_pipe._io_save no_echo, "match continue connecting"
        exp_puts 'yes'
      when /(Login incorrect|denied, please try again)/
        spawnee_reset
      else
        # For objects that include Expect4r but do not subclass base Login class.
        @matches ||= []
        @matches.each { |match, _send|
          if read_pipe._io_string =~ match
            read_pipe._io_save no_echo, "match #{match}"
            if _send.is_a?(Proc)
              exp_puts _send.call
            else
              exp_puts _send
            end
          end
        }
      end          
    end
  end
  case ev
  when :cnx_error
    child_exit
    err_msg = "Could not connect to #{@host}:\n"
    err_msg += " >> #{cmd}\n    "
    err_msg += buf.join("\n    ")
    raise ConnectionError.new(err_msg)
  else
    @_lp_1 = buf[-2]
    @lp = buf.last
  end
  [buf, ev]
end

#child_exit ⇒ Object 



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# File 'lib/expect/io.rb', line 83

def child_exit
  if @proxy
    @proxy.logout
  else
    Process.kill(:KILL, @pid) if @pid
    @thread.kill if @thread
  end
rescue Errno::ESRCH, Errno::ECHILD => e
ensure
  @lp, @r, @w, @pid, @proxy = [nil]*5
end

#connected? ⇒ Boolean 



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# File 'lib/expect/io.rb', line 274

def connected?
  @r && (not child_exited?)
end

#exp_print(s) ⇒ Object 



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# File 'lib/expect/io.rb', line 139

def exp_print(s)
  _retry=self.connect_retry
  begin
    exp_internal "print: #{s.inspect}, io_writer: #{@w}"
    return unless @w
    @w.print(s) and flush
  rescue Errno::EIO, Errno::ECHILD
    child_exit
    exp_internal "session disconnected: retrying..."
    raise unless _retry>0
    _retry -=1
    sleep(1)
    self.
    retry
  end
end

#exp_puts(s) ⇒ Object 



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# File 'lib/expect/io.rb', line 135

def exp_puts(s)
  exp_print "#{s}\r"
end

#exp_send(lines, arg = {}) ⇒ Object 



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# File 'lib/expect/io.rb', line 201

def exp_send(lines, arg={})
  r=[]
  lines.each_line do |l|
    l = l.chomp("\n").chomp("\r").strip
    r << putline(l, arg) if l.size>0
  end
  lines.size==1 ? r[0] : r
end

#expect(match, ti = 5, matches = []) ⇒ Object 



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# File 'lib/expect/io.rb', line 210

def expect(match, ti=5, matches=[])
  t0 = Time.now
  rc, buf = catch(:done) do
    @r.readbuf(ti) do |r|
      if r._io_exit?
        throw :done, [:abort, r._io_string!]
      end
      case r._io_string
      when match
        r._io_save false, "matching PROMPT"
        # puts  "debug IO BUF 1 #{r._io_buf1.inspect}"
        throw(:done, [:ok, r._io_buf1])
        # FIXME
        # Watch out for the ping command !!!!
        # throw :done, [:ok, r._io_string!.chomp("\r\n")]
      when /(.+)\r\n/, "\r\n"
        r._io_save false, "matching EOL"
      else
      matches.each do |match, arg|
        if r._io_string =~ match
          r._io_save false, "match #{match}"
          if arg.is_a?(Proc)
            arg.call(self)
          else
            exp_puts arg
          end
        end
      end
      end
    end
  end
  case rc
  when :abort
    elapsed = Time.now - t0
    if elapsed < ti
      child_exit
      raise ConnectionError.new(buf)
    else
      raise ExpTimeoutError.new(buf, elapsed)
    end
  else
    @lp = buf.last
  end
  [buf, rc]
end

#get_prompt ⇒ Object 



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# File 'lib/expect/io.rb', line 256

def get_prompt
  putline '', :no_trim=>true, :no_echo=>true
end

#getc ⇒ Object 



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# File 'lib/expect/io.rb', line 156

def getc
  _retry=self.connect_retry
  begin
    @r.getc if @r
  rescue Errno::EIO, Errno::ECHILD
    child_exit
    exp_internal "session disconnected: retrying..."
    raise unless _retry>0
    _retry -=1
    sleep(1)
    self.
    retry
  end
end

#interact(k = "C-t") ⇒ Object 



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# File 'lib/expect/io.rb', line 171

def interact(k="C-t")
  raise unless k =~ /C\-[A-Z]/i
  unless STDOUT.tty? and STDIN.tty?
    $stderr.puts "Cannot interact: not running from terminal!"
    return
  end
   unless connected?
  @@interact_mutex ||= Mutex.new

  @@interact_mutex.synchronize {
    k.upcase!
    STDOUT.puts "\n\#\n\# #{k.gsub(/C\-/,'^')} to terminate.\n\#\n"
    reader :start
    writer(eval "?\\#{k}")
  }
rescue
ensure
  begin
    reader :terminate
    putline ' ', :no_trim=>true, :no_echo=>true
  rescue => e
    exp_internal e.to_s
  end
end

#login_by_proxy(proxy) ⇒ Object Also known as: login_via

Raises:

  • (ArgumentError) 


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# File 'lib/expect/io.rb', line 278

def (proxy)
  raise ArgumentError, "Don't know how to login to #{proxy}" unless proxy.respond_to? :_login_
   :proxy=> proxy
end

#logout ⇒ Object 



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# File 'lib/expect/io.rb', line 120

def logout
  child_exit
  @lp, @_lp_1 = nil,nil
  @pid
end

#putc(c) ⇒ Object 



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# File 'lib/expect/io.rb', line 126

def putc(c)
  return unless @w || c.nil?
  exp_internal "[#{c}]"
  @w.putc(c) and flush
rescue Errno::EIO
  child_exit
  raise 
end

#putcr ⇒ Object 



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# File 'lib/expect/io.rb', line 196

def putcr
  putline '', :no_trim=>true, :no_echo=>true
  nil
end

#read_until(match, ti = 0.2) ⇒ Object 



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# File 'lib/expect/io.rb', line 267

def read_until(match,ti=0.2)
  ret = expect(match, ti, [])
  ret[0][0].chomp
rescue ExpTimeoutError => ex
  ''
end

#readline(ti = 0.2, matches = []) ⇒ Object 



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# File 'lib/expect/io.rb', line 260

def readline(ti=0.2, matches=[])
  ret = expect(/(.+)\r\n/, ti, matches)
  ret[0][0].chomp
rescue ExpTimeoutError => ex
  ''
end

#spawn(cmd) ⇒ Object 



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# File 'lib/expect/io.rb', line 95

def spawn(cmd)
  begin
    child_exited = false
    @thread = Thread.new do
      PTY.spawn(cmd) do |pipe_read, pipe_write, pid|
        @r, @w, @pid = pipe_read, pipe_write, pid
        begin 
          Process.wait(@pid,0)
        rescue
        ensure
          child_exited = true
        end
      end
    end
    @thread.priority = -2
    unless child_exited
      while @r.nil?
        sleep(0.05) 
      end
    end
  rescue => e
    raise SpawnError.new(cmd)
  end
end