Synnefo » snf-ganeti » ganeti-local

import re

  def GetLinuxNodeInfo(self):

    """For linux systems, return actual OS information.

    This is an abstraction for all non-hypervisor-based classes, where

    the node actually sees all the memory and CPUs via the /proc

    interface and standard commands. The other case if for example

    xen, where you only see the hardware resources via xen-specific

    tools.

    @return: a dict with the following keys (values in MiB):

          - memory_total: the total memory size on the node

          - memory_free: the available memory on the node for instances

          - memory_dom0: the memory used by the node itself, if available

    """

    try:

      fh = file("/proc/meminfo")

      try:

        data = fh.readlines()

      finally:

        fh.close()

    except EnvironmentError, err:

      raise errors.HypervisorError("Failed to list node info: %s" % (err,))

    result = {}

    sum_free = 0

    try:

      for line in data:

        splitfields = line.split(":", 1)

        if len(splitfields) > 1:

          key = splitfields[0].strip()

          val = splitfields[1].strip()

          if key == 'MemTotal':

            result['memory_total'] = int(val.split()[0])/1024

          elif key in ('MemFree', 'Buffers', 'Cached'):

            sum_free += int(val.split()[0])/1024

          elif key == 'Active':

            result['memory_dom0'] = int(val.split()[0])/1024

    except (ValueError, TypeError), err:

      raise errors.HypervisorError("Failed to compute memory usage: %s" %

                                   (err,))

    result['memory_free'] = sum_free

    cpu_total = 0

    try:

      fh = open("/proc/cpuinfo")

      try:

        cpu_total = len(re.findall("(?m)^processor\s*:\s*[0-9]+\s*$",

                                   fh.read()))

      finally:

        fh.close()

    except EnvironmentError, err:

      raise errors.HypervisorError("Failed to list node info: %s" % (err,))

    result['cpu_total'] = cpu_total

    # FIXME: export correct data here

    result['cpu_nodes'] = 1

    result['cpu_sockets'] = 1

    return result