Class: ExecService::Result

Inherits:
Object
  • Object
show all
Defined in:
lib/exec_service/result.rb

Overview

The result returned from a subcommand execution. This includes the identifying name of the execution (if any), the result status of the execution, and any captured stream output.

Possible result statuses are:

  • The process failed to start. #failed? will return true, and #exception will return an exception describing the failure (often an errno).
  • The process executed and exited with a normal exit code. Either #success? or #error? will return true, and #exit_code will return the numeric exit code.
  • The process executed but was terminated by an uncaught signal. #signaled? will return true, and #signal_code will return the numeric signal code.

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#captured_err ⇒ String? (readonly)

The captured error string.

Returns:

  • (String) —

    The string captured from stderr.

  • (nil) —

    if the command was not configured to capture stderr.



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# File 'lib/exec_service/result.rb', line 43

def captured_err
  @captured_err
end

#captured_out ⇒ String? (readonly)

The captured output string.

Returns:

  • (String) —

    The string captured from stdout.

  • (nil) —

    if the command was not configured to capture stdout.



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# File 'lib/exec_service/result.rb', line 35

def captured_out
  @captured_out
end

#exception ⇒ Exception? (readonly)

The exception raised if a process couldn't be started.

Exactly one of #exception and #status will be non-nil. Exactly one of #exception, #exit_code, or #signal_code will be non-nil.

Returns:

  • (Exception) —

    The exception raised from process start.

  • (nil) —

    if the process started successfully.



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# File 'lib/exec_service/result.rb', line 67

def exception
  @exception
end

#name ⇒ Object (readonly)

The subcommand's name.

Returns:

  • (Object) 


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# File 'lib/exec_service/result.rb', line 27

def name
  @name
end

#status ⇒ Process::Status? (readonly)

The Ruby process status object, providing various information about the ending state of the process.

Exactly one of #exception and #status will be non-nil.

Returns:

  • (Process::Status) —

    The status, if the process was successfully spawned and terminated.

  • (nil) —

    if the process could not be started.



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# File 'lib/exec_service/result.rb', line 55

def status
  @status
end

Instance Method Details

#effective_code ⇒ Integer

Returns an "effective" exit code, which is always an integer if the process has terminated for any reason. In general, this code will be:

  • The same as #exit_code if the process terminated normally with an exit code,
  • The convention of 128+signalnum if the process terminated due to a signal,
  • The convention of 126 if the process could not start due to lack of execution permissions,
  • The convention of 127 if the process could not start because the command was not recognized or could not be found, or
  • An undefined value between 1 and 255 for other failures.

Note that the normal exit code and signal number cases are stable, but any other cases are subject to change on future releases.

Returns:

  • (Integer) 


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# File 'lib/exec_service/result.rb', line 162

def effective_code
  code = exit_code
  return code unless code.nil?
  code = signal_code
  return code + 128 unless code.nil?
  case exception
  when ::Errno::ENOENT
    127
  else
    # This is the intended result for ENOEXEC/EACCES.
    # For now, any other error (e.g. EBADARCH on MacOS) will also map
    # to this result. We can change this in the future since the
    # documentation explicitly allows it.
    126
  end
end

#error? ⇒ boolean

Returns true if the subprocess terminated with a nonzero status, or false if the process failed to start, terminated due to a signal, or returned a zero status.

Returns:

  • (boolean) 


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# File 'lib/exec_service/result.rb', line 138

def error?
  code = exit_code
  !code.nil? && !code.zero?
end

#exit_code ⇒ Integer?

The numeric status code for a process that exited normally,

Exactly one of #exception, #exit_code, or #signal_code will be non-nil.

Returns:

  • (Integer) —

    the numeric status code, if the process started successfully and exited normally.

  • (nil) —

    if the process did not start successfully, or was terminated by an uncaught signal.



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# File 'lib/exec_service/result.rb', line 80

def exit_code
  status&.exitstatus
end

#failed? ⇒ boolean

Returns true if the subprocess failed to start, or false if the process was able to execute.

Returns:

  • (boolean) 


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# File 'lib/exec_service/result.rb', line 105

def failed?
  status.nil?
end

#signal_code ⇒ Integer? Also known as: term_signal

The numeric signal code that caused process termination.

Exactly one of #exception, #exit_code, or #signal_code will be non-nil.

Returns:

  • (Integer) —

    The signal that caused the process to terminate.

  • (nil) —

    if the process did not start successfully, or executed and exited with a normal exit code.



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# File 'lib/exec_service/result.rb', line 94

def signal_code
  status&.termsig
end

#signaled? ⇒ boolean

Returns true if the subprocess terminated due to an unhandled signal, or false if the process failed to start or exited normally.

Returns:

  • (boolean) 


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# File 'lib/exec_service/result.rb', line 115

def signaled?
  !signal_code.nil?
end

#success? ⇒ boolean

Returns true if the subprocess terminated with a zero status, or false if the process failed to start, terminated due to a signal, or returned a nonzero status.

Returns:

  • (boolean) 


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# File 'lib/exec_service/result.rb', line 126

def success?
  code = exit_code
  !code.nil? && code.zero?
end