Class: ForemanRemoteExecutionCore::PollingScriptRunner

Inherits:
ScriptRunner
  • Object
show all
Defined in:
lib/foreman_remote_execution_core/polling_script_runner.rb

Constant Summary collapse

DEFAULT_REFRESH_INTERVAL = 
60

Constants inherited from ScriptRunner

ScriptRunner::EXPECTED_POWER_ACTION_MESSAGES

Instance Attribute Summary

Attributes inherited from ScriptRunner

#execution_timeout_interval

Instance Method Summary collapse

Methods inherited from ScriptRunner

#kill, #publish_data, #start, #timeout, #timeout_interval, #with_disconnect_handling, #with_retries

Constructor Details

#initialize(options = {}) ⇒ PollingScriptRunner

Returns a new instance of PollingScriptRunner.



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# File 'lib/foreman_remote_execution_core/polling_script_runner.rb', line 6

def initialize(options = {})
  super(options)
  @callback_host = options[:callback_host]
  @task_id = options[:uuid]
  @step_id = options[:step_id]
  @otp = ForemanTasksCore::OtpManager.generate_otp(@task_id)
end

Instance Method Details

#callback_script ⇒ Object 



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# File 'lib/foreman_remote_execution_core/polling_script_runner.rb', line 100

def callback_script
  "  | #!/bin/sh\n  | exit_code=$(cat \"\#{@exit_code_path}\")\n  | url=\"\#{@callback_host}/dynflow/tasks/\#{@task_id}/done\"\n  | json=\"{ \\\\\\\"step_id\\\\\\\": \#{@step_id} }\"\n  | if which curl >/dev/null; then\n  |   curl -X POST -d \"$json\" -u \"\#{@task_id}:\#{@otp}\" \"$url\"\n  | else\n  |   echo 'curl is required' >&2\n  |   exit 1\n  | fi\n  SCRIPT\nend\n".gsub(/^ +\| /, '')

#callback_scriptlet(callback_script_path = nil) ⇒ Object 



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# File 'lib/foreman_remote_execution_core/polling_script_runner.rb', line 91

def callback_scriptlet(callback_script_path = nil)
  if @otp
    callback_script_path = cp_script_to_remote(callback_script, 'callback') if callback_script_path.nil?
    "#{su_prefix}#{callback_script_path}"
  else
    ':' # Shell synonym for "do nothing"
  end
end

#close ⇒ Object 



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# File 'lib/foreman_remote_execution_core/polling_script_runner.rb', line 52

def close
  super
  ForemanTasksCore::OtpManager.drop_otp(@task_id, @otp) if @otp
end

#control_script ⇒ Object 



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# File 'lib/foreman_remote_execution_core/polling_script_runner.rb', line 22

def control_script
  close_stdin = '</dev/null'
  close_fds = close_stdin + ' >/dev/null 2>/dev/null'
  # pipe the output to tee while capturing the exit code in a file, don't wait for it to finish, output PID of the main command
  "  | sh -c '(\#{su_prefix}\#{@remote_script} \#{close_stdin}; echo $?>\#{@exit_code_path}) | /usr/bin/tee \#{@output_path} >/dev/null; \#{callback_scriptlet}' \#{close_fds} &\n  | echo $! > '\#{@pid_path}'\n  SCRIPT\nend\n".gsub(/^\s+\| /, '')

#prepare_retrieval ⇒ Object 



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# File 'lib/foreman_remote_execution_core/polling_script_runner.rb', line 57

def prepare_retrieval
  # The script always outputs at least one line
  # First line of the output either has to begin with
  # "RUNNING" or "DONE $EXITCODE"
  # The following lines are treated as regular output
  base = File.dirname(@output_path)
  posfile = File.join(base, 'position')
  tmpfile = File.join(base, 'tmp')
  script = "  | #!/bin/sh\n  | pid=$(cat \"\#{@pid_path}\")\n  | if ! pgrep --help 2>/dev/null >/dev/null; then\n  |   echo DONE 1\n  |   echo \"pgrep is required\" >&2\n  |   exit 1\n  | fi\n  | if pgrep -P \"$pid\" >/dev/null 2>/dev/null; then\n  |   echo RUNNING\n  | else\n  |   echo \"DONE $(cat \"\#{@exit_code_path}\" 2>/dev/null)\"\n  | fi\n  | [ -f \"\#{@output_path}\" ] || exit 0\n  | [ -f \"\#{posfile}\" ] || echo 1 > \"\#{posfile}\"\n  | position=$(cat \"\#{posfile}\")\n  | tail --bytes \"+${position}\" \"\#{@output_path}\" > \"\#{tmpfile}\"\n  | bytes=$(cat \"\#{tmpfile}\" | wc --bytes)\n  | expr \"${position}\" + \"${bytes}\" > \"\#{posfile}\"\n  | cat \"\#{tmpfile}\"\n  SCRIPT\n  @logger.debug(\"copying script:\\n\#{script.lines.map { |line| \"    | \#{line}\" }.join}\")\n  cp_script_to_remote(script, 'retrieve')\n  @prepared = true\nend\n".gsub(/^ +\| /, '')

#prepare_start ⇒ Object 



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# File 'lib/foreman_remote_execution_core/polling_script_runner.rb', line 14

def prepare_start
  super
  basedir         = File.dirname @remote_script
  @pid_path       = File.join(basedir, 'pid')
  @retrieval_script ||= File.join(basedir, 'retrieve')
  prepare_retrieval unless @prepared
end

#refresh ⇒ Object 



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# File 'lib/foreman_remote_execution_core/polling_script_runner.rb', line 36

def refresh
  err = output = nil
  with_retries do
    _, output, err = run_sync("#{su_prefix} #{@retrieval_script}")
  end
  lines = output.lines
  result = lines.shift.match(/^DONE (\d+)?/)
  publish_data(lines.join, 'stdout') unless lines.empty?
  publish_data(err, 'stderr') unless err.empty?
  if result
    exitcode = result[1] || 0
    publish_exit_status(exitcode.to_i)
  end
  destroy_session
end

#trigger(*args) ⇒ Object 



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# File 'lib/foreman_remote_execution_core/polling_script_runner.rb', line 32

def trigger(*args)
  run_sync(*args)
end