Implement stats-tube command

[vimukthi-git]

The stats-tube command gives statistical information about the specified tube
if it exists. Its form is:

stats-tube <tube>\r\n

• is a name at most 200 bytes. Stats will be returned for this tube.

The response is one of:

• "NOT_FOUND\r\n" if the tube does not exist.

• "OK \r\n\r\n"

  • is the size of the following data section in bytes.

  • is a sequence of bytes of length from the previous line. It
    is a YAML file with statistical information represented a dictionary.

The stats-tube data is a YAML file representing a single dictionary of strings
to scalars. It contains these keys:

• "name" is the tube's name.

• "current-jobs-urgent" is the number of ready jobs with priority < 1024 in
  this tube.

• "current-jobs-ready" is the number of jobs in the ready queue in this tube.

• "current-jobs-reserved" is the number of jobs reserved by all clients in
  this tube.

• "current-jobs-delayed" is the number of delayed jobs in this tube.

• "current-jobs-buried" is the number of buried jobs in this tube.

• "total-jobs" is the cumulative count of jobs created in this tube in
  the current beanstalkd process.

• "current-using" is the number of open connections that are currently
  using this tube.

• "current-waiting" is the number of open connections that have issued a
  reserve command while watching this tube but not yet received a response.

• "current-watching" is the number of open connections that are currently
  watching this tube.

• "pause" is the number of seconds the tube has been paused for.

• "cmd-delete" is the cumulative number of delete commands for this tube

• "cmd-pause-tube" is the cumulative number of pause-tube commands for this
  tube.

• "pause-time-left" is the number of seconds until the tube is un-paused.