#!/usr/bin/python

import re
import commands
from xml.dom import minidom
from xml.dom.ext import PrettyPrint

# xml file names
install_xml = '../xml/install.xml'
config_xml  = '../xml/config.xml'

def to_xml_attr(doc, node, cls, name):
    ''' This method is called by to_xml. Its function is to create an attribute, and set its value based on Network data member 
 doc - xml document
 node - xml node
 cls - python class/python instance
 name - attribute name'''
    attr = doc.createAttribute(name)
    attr.value = getattr(cls, name)
    node.setAttributeNode(attr)

class SerialNumber:
    ''' serial number '''
    value = ''
    @staticmethod
    def init_from_xml(node):
        ''' set value based on xml node '''
        SerialNumber.value = node.firstChild.data.encode('ascii')

    @staticmethod
    def to_xml(doc, p_node):
        ''' write SerialNumber into xml 
doc - xml document instance
p_node - xml node (parent node)'''
        sn = doc.createElement('serial-number')
        data = doc.createTextNode(SerialNumber.value)
        sn.appendChild(data)
        p_node.appendChild(sn)

class Partition:
    ''' disk partition '''
    unit=''
    list=[]
    def __init__(self, dev, st, sz, id, fr):
        ''' Partition init function '''
        self.device = dev
        self.start  = st
        self.size   = sz
        self.id     = id
        self.from_os = fr
        Partition.list.append(self)

    @staticmethod
    def init_from_os():
        ''' create a Partition instance from hardware info'''
#        cmd = 'sfdisk -d'
        # has problem on raid detection
        cmd = 'cat /home/zhi/work/new_install/python/mine/sfdisk.txt'
        st, o =  commands.getstatusoutput(cmd)
        if st:
            return
        p0 = re.compile(r'unit:\s*(\w+)')
        p = re.compile(r'''
\s*(\w+)\s*:          # device
\s*start=\s*(\d+)\s*, # start
\s*size=\s*(\d+)\s*,  # size 
\s*Id=\s*(\d+)        # id
''', re.VERBOSE)
        for s in o.splitlines():
            res0 = p0.search(s)
            if res0:
                Partition.unit = res0.groups()[0]
            res = p.search(s)
            if res:
                dev, start, size, id = res.groups()
                Partition(dev.split('/')[-1], start, size, id, True)

    @staticmethod
    def init_from_xml(node):
        ''' create Partition instances from xml node '''
        Partition.unit = node.attributes['unit'].value.encode('ascii')
        for p in node.childNodes:
            if p.nodeType == node.ELEMENT_NODE and p.nodeName == 'partition':
                Partition(p.attributes['device'].value.encode('ascii'),\
                              p.attributes['start'].value.encode('ascii'), \
                              p.attributes['size'].value.encode('ascii'), \
                              p.attributes['id'].value.encode('ascii'), \
                              p.attributes['from_os'].value.encode('ascii'))

    @staticmethod
    def to_xml(doc, p_node):
        ''' write all Partition instance into xml 
doc - xml document instance
p_node - xml node (parent node)'''
        pts = doc.createElement("partitions")
        unit_attr = doc.createAttribute('unit')
        unit_attr.value = Partition.unit
        pts.setAttributeNode(unit_attr)
        for p in Partition.list:
            pt = doc.createElement('partition')
            dev_attr   = doc.createAttribute('device')
            start_attr = doc.createAttribute('start')
            size_attr  = doc.createAttribute('size')
            id_attr    = doc.createAttribute('id')
            from_attr    = doc.createAttribute('from_os')
            dev_attr.value   = p.device
            start_attr.value = p.start
            size_attr.value  = p.size
            id_attr.value    = p.id
            from_attr.value    = p.from_os
            pt.setAttributeNode(dev_attr)
            pt.setAttributeNode(start_attr)
            pt.setAttributeNode(size_attr)
            pt.setAttributeNode(id_attr)
            pt.setAttributeNode(from_attr)
            pts.appendChild(pt)
        p_node.appendChild(pts)

    @staticmethod
    def get_size(dev):
        for p in Partition.list:
            if p.device == dev:
                return p.size
        
class Raid:
    ''' raid information '''
    list = []
    def __init__(self, dev, from_os, level, sz, a_devs, s_devs=[]):
        ''' Raid init function '''
        self.device  = dev
        self.from_os = from_os
        self.level   = level
        self.size    = sz
        self.active_components = a_devs
        self.spare_components  = s_devs
        Raid.list.append(self)

    @staticmethod
    def init_from_os():
        #cmd = 'cat /proc/mdstat'
        cmd = 'cat /home/zhi/work/new_install/python/mine/raid.txt'
        st, o = commands.getstatusoutput(cmd)
        if st:
            return
        dev_p  = re.compile(r'''
^(md\d+)\s*:   # md device
\s*active\s*   # "active"
(\w+)\s*       # raid type
''', re.VERBOSE)

        size_p = re.compile(r'''
^\s*(\d+)   # block number
\s*blocks''', re.VERBOSE)


        for s in o.splitlines():
            dev_res = dev_p.split(s)
            if len(dev_res)>1: # matched
                # dev_res[0] is ''
                raid_dev = dev_res[1]
                raid_level = dev_res[2]
                act_cmpts =[]
                spr_cmpts =[]
                for ss in dev_res[3].split():
                    if re.search(r'\(S\)', ss):
                        spr_cmpts.append(ss[:ss.index('[')])
                    else:
                        act_cmpts.append(ss[:ss.index('[')])
                continue

            if size_p.match(s).groups(): 
                raid_size = size_p.match(s).groups()[0]
                # if already detect a raid dev
                if raid_dev:
                    Raid(raid_dev, True, raid_level, raid_size, act_cmpts, spr_cmpts)
                    # clear raid dev
                    raid_dev=''


    @staticmethod
    def add_component(node, l):
        ''' add component devices (in xml node) to list
node - xml node
l    - list
'''
        for sub in node.childNodes:
            if sub.nodeType == sub.ELEMENT_NODE and sub.nodeName == 'component':
                l.append(sub.firstChild.data.encode('ascii'))

    @staticmethod
    def init_from_xml(node):
        ''' create Raid instances from xml node '''
        for e in node.childNodes:
            if e.nodeType == e.ELEMENT_NODE and e.nodeName == 'raid':
                raid_dev = e.attributes['device'].value
                raid_from = e.attributes['from_os'].value
                raid_level = e.attributes['level'].value
                raid_size = e.attributes['size'].value
                act_cmpts = []
                spr_cmpts = []
                for sub_e in e.childNodes:
                    if sub_e.nodeType == sub_e.ELEMENT_NODE:
                        if sub_e.nodeName == 'active':
                            Raid.add_component(sub_e, act_cmpts)
                        elif sub_e.nodeName == 'spare':
                            Raid.add_component(sub_e, spr_cmpts)

                Raid(raid_dev, raid_from, raid_level, raid_size, act_cmpts, spr_cmpts)

    @staticmethod
    def to_xml(doc, p_node):
        ''' write all raid instance into xml
doc - xml document instance
p_node - xml node (parent node) '''
        raids = doc.createElement('raids')
        for r in Raid.list:
            rd = doc.createElement('raid')

            rd_dev_attr = doc.createAttribute('device')
            rd_dev_attr.value = r.device
            rd.setAttributeNode(rd_dev_attr)

            rd_from_attr = doc.createAttribute('from_os')
            rd_from_attr.value = r.from_os
            rd.setAttributeNode(rd_from_attr)

            rd_level_attr = doc.createAttribute('level')
            rd_level_attr.value = r.level
            rd.setAttributeNode(rd_level_attr)

            rd_size_attr = doc.createAttribute('size')
            rd_size_attr.value = r.size
            rd.setAttributeNode(rd_size_attr)

            rd_act_elem = doc.createElement('active')
            for act_c in r.active_components:
                act_c_e = doc.createElement('component')
                act_c_tn = doc.createTextNode(act_c)
                act_c_e.appendChild(act_c_tn)
                rd_act_elem.appendChild(act_c_e)
            rd.appendChild(rd_act_elem)

            rd_spr_elem = doc.createElement('spare')
            for spr_c in r.spare_components:
                spr_c_e = doc.createElement('component')
                spr_c_tn = doc.createTextNode(spr_c)
                spr_c_e.appendChild(spr_c_tn)
                rd_spr_elem.appendChild(spr_c_e)
            rd.appendChild(rd_spr_elem)

            raids.appendChild(rd)

        p_node.appendChild(raids)
 
    @staticmethod
    def get_size(dev):
        for r in Raid.list:
            if r.device == dev:
                return r.size

    @staticmethod
    def get_next_device():
        ''' get next available raid device name '''
        num_p = re.compile(r'md(\d+)')
        numbers = [ int(num_p.match(r.device).groups()[0]) for r in Raid.list ]
        max = 0
        for n in numbers:
            if n > max: max = n
        return 'md%d' %(max+1)

class MountPoint:
    ''' mount-points '''
    list=[]
    def __init__(self, dev, dir='', fs='', fm='no', sz='0'):
        self.device     = dev
        self.directory  = dir
        self.filesystem = fs
        self.format     = fm
        self.size       = sz
        MountPoint.list.append(self)

    @staticmethod
    def change(dev, dir, fs, fm):
        for mp in MountPoint.list:
            if mp.device == dev:
                mp.directory  = dir
                mp.filesystem = fs
                mp.format     = fm

    def device(self):
        return self.device

    @staticmethod
    def init_from_internal():
        ''' init MountPoint from internal class Partition and class Raid '''
        devs = [ m.device for m in MountPoint.list ]
        for p in Partition.list:
            if p.id != 'fd' and p.device not in devs:
                MountPoint(p.device, sz=p.size)

        for r in Raid.list:
            if r.device not in devs:
                MountPoint(r.device, sz=r.size)

        # now process whether a partition or raid was removed
        s1 = set([ m.device for m in MountPoint.list ])
        s2 = set([ p.device for p in Partition.list ] + [ r.device for r in Raid.list])
        for dev in s1-s2:
            for i in range(len(MountPoint.list)):
                if dev == MountPoint.list[i].device:
                    del MountPoint.list[i]
                    break
        # sort
        MountPoint.list.sort(key=MountPoint.device)

    @staticmethod
    def init_from_xml(node):
        ''' create MountPoint instances from xml node '''
        for m in node.childNodes:
            if m.nodeType == node.ELEMENT_NODE and m.nodeName == 'mount-point':
                MountPoint(m.attributes['device'].value.encode('ascii'), \
                               m.attributes['directory'].value.encode('ascii'), \
                               m.attributes['file-system'].value.encode('ascii'), \
                               m.attributes['format'].value.encode('ascii') )

    @staticmethod
    def to_xml(doc, p_node):
        ''' write all MountPoint instance into xml
doc - xml document instance
p_node - xml node (parent node)'''
        mps = doc.createElement('mount-points')
        for m in MountPoint.list:
            mp = doc.createElement('mount-point')
            dev_attr = doc.createAttribute('device')
            dir_attr = doc.createAttribute('directory')
            fs_attr  = doc.createAttribute('file-system')
            fm_attr  = doc.createAttribute('format')
            dev_attr.value = m.device
            dir_attr.value = m.directory
            fs_attr.value  = m.filesystem
            fm_attr.value  = m.format
            mp.setAttributeNode(dev_attr)
            mp.setAttributeNode(dir_attr)
            mp.setAttributeNode(fs_attr)
            mp.setAttributeNode(fm_attr)
            mps.appendChild(mp)
        p_node.appendChild(mps)
    
class Network:
    ''' network '''
    hostname      =''
    configuration =''
    domain        = ''
    ip            = ''
    mask          = ''
    gateway       = ''
    primary_dns   = ''
    secondary_dns = ''

    @staticmethod
    def init_from_xml(node):
        ''' init Network from xml node '''
        for k in node.attributes.keys():
            setattr(Network, k, node.attributes[k].value.encode('ascii'))

    @staticmethod
    def to_xml(doc, p_node):
        ''' write Network into xml
doc - xml document instance
p_node - xml node (parent node)'''
        ntwk = doc.createElement('network')
        for nm in ('hostname', 'configuration', 'ip', 'mask', 'gateway', 'primary_dns', 'secondary_dns', 'domain'):
            to_xml_attr(doc, ntwk, Network, nm)
        p_node.appendChild(ntwk)

class Group:
    ''' software package group '''
    dict = {}
    def __init__(self, n, i):
        self.name = n
        self.install = i
        self.description = ''
        self.mandatory = []
        self.selection = 'manual'
        self.optional = []
        Group.dict[n] = self

    @staticmethod
    def handle_release_node(r_node):
        ''' This method is called by init_from_config_xml
r_node - release node '''
        for i in r_node.childNodes:
            if i.nodeType == i.ELEMENT_NODE and i.nodeName == 'including':
                Group(i.attributes['group'].value, \
                      i.attributes['install'].value == 'mandatory' and 'mandatory' or 'no')

    @staticmethod
    def handle_group_node(g_node):
        ''' This method is called by init_from_config_xml
g_node - group node '''
        g = Group.dict[g_node.attributes['name'].value]
        for n in g_node.childNodes:
            if n.nodeType == n.ELEMENT_NODE:
                if n.nodeName == 'description':
                    g.description = n.firstChild.data
                elif n.nodeName == 'including':
                    if n.attributes['install'].value == 'mandatory':
                        g.mandatory.append(n.attributes['package'].value.encode('ascii'))
                    else:
                        g.optional.append([n.attributes['package'].value.encode('ascii'), 'no'])

    @staticmethod
    def init_from_config_xml(node):
        ''' init Group instances from config xml
 node - root node of config xml'''
        rls_list = [r for r in node.childNodes
                    if r.nodeType == r.ELEMENT_NODE and r.nodeName == 'release']
        grp_list = [g for g in node.childNodes
                    if g.nodeType == g.ELEMENT_NODE and g.nodeName == 'group']
        Group.handle_release_node(rls_list[0])
        for g in grp_list:
            Group.handle_group_node(g)

    @staticmethod
    def init_from_install_xml(node):
        ''' init Group instances from install xml
 node - install xml 'groups' node'''
        for grp in node.childNodes:
            if grp.nodeType == grp.ELEMENT_NODE and grp.nodeName == 'group':
                g = Group(grp.attributes['name'].value, grp.attributes['install'].value)
                for grp_chld in grp.childNodes:
                    if grp_chld.nodeType == grp_chld.ELEMENT_NODE:
                        if grp_chld.nodeName == 'description':
                            g.description = grp_chld.firstChild.data
                        elif grp_chld.nodeName == 'mandatory':
                            g.mandatory.extend([pkg.attributes['name'].value for pkg in grp_chld.childNodes
                                                if pkg.nodeType == pkg.ELEMENT_NODE and pkg.nodeName == 'package'])
                        elif grp_chld.nodeName == 'optional':
                            g.optional.extend([[pkg.attributes['name'].value, pkg.attributes['install'].value] for pkg in grp_chld.childNodes
                                               if pkg.nodeType == pkg.ELEMENT_NODE and pkg.nodeName == 'package'])
                            g.selection = grp_chld.attributes['selection'].value
    init_from_xml = init_from_install_xml
    @staticmethod
    def to_xml(doc, p_node):
        ''' write Group instances into xml
doc - xml document instance
p_node - xml node (parent node)'''
        grps = doc.createElement('groups')
        for g in Group.dict.values():
            grp = doc.createElement('group')
            name_attr = doc.createAttribute('name')
            name_attr.value = g.name
            grp.setAttributeNode(name_attr)

            inst_attr = doc.createAttribute('install')
            inst_attr.value = g.install
            grp.setAttributeNode(inst_attr)

            if g.description:
                dscp = doc.createElement('description')
                dscp_data = doc.createTextNode(g.description)
                dscp.appendChild(dscp_data)
                grp.appendChild(dscp)

            if g.mandatory:
                mndt = doc.createElement('mandatory')
                for m in g.mandatory:
                    pkg = doc.createElement('package')
                    pname_attr = doc.createAttribute('name')
                    pname_attr.value = m
                    pkg.setAttributeNode(pname_attr)

                    mndt.appendChild(pkg)
                grp.appendChild(mndt)

            if g.optional:
                optl = doc.createElement('optional')
                sel_attr = doc.createAttribute('selection')
                sel_attr.value = g.selection
                optl.setAttributeNode(sel_attr)
                for o in g.optional:
                    pkg = doc.createElement('package')
                    pname_attr = doc.createAttribute('name')
                    pname_attr.value = o[0]
                    pkg.setAttributeNode(pname_attr)
                    pinst_attr = doc.createAttribute('install')
                    pinst_attr.value = o[1]
                    pkg.setAttributeNode(pinst_attr)
                    optl.appendChild(pkg)
                grp.appendChild(optl)
            grps.appendChild(grp)
        p_node.appendChild(grps)

class Service:
    ''' service '''
    list = []
    def __init__(self, nm, nb, sc, st, p):
        ''' init method
nm - name
nb - number
sc - script
st - start (yes/no/disable)
p  - pkg, that includes this service
'''
        self.name   = nm
        self.number = nb
        self.script = sc
        self.start  = st
        self.package = p
        Service.list.append(self)

    @staticmethod
    def init_from_config_xml(root):
        ''' init Service instances from config xml
 root - root node of config xml '''
        for p in root.childNodes:
            if p.nodeType == p.ELEMENT_NODE and p.nodeName == 'package':
                for s in p.childNodes:
                    if s.nodeType == s.ELEMENT_NODE and s.nodeName == 'service':
                        Service(s.attributes['name'].value, \
                                    s.attributes['number'].value, \
                                    s.attributes['script'].value, \
                                    'disable', \
                                    p.attributes['name'].value )

    @staticmethod
    def change_state():
        ''' Based on package information in Group class, change 'start' data member
 from 'disable' to 'no', or from 'yes'/'no' to 'disable' '''
        l = []
        for g in Group.dict.values():
            if g.install == 'mandatory' or g.install == 'yes':
                l.extend(g.mandatory)
                if g.selection == 'all':
                    l.extend([ n for n, i in g.optional])
                elif g.selection == 'manual':
                    l.extend([ n for n, i in g.optional if i == 'yes'])
                else: # selection is 'none'
                    pass

        for s in Service.list:
            if s.package in l:
                if s.start == 'disable':
                    s.start = 'no'
            else:
                s.start = 'disable'

    @staticmethod
    def init_from_install_xml(node):
        ''' init Service instances from install xml
node - install xml 'services' node'''
        for srv in node.childNodes:
            if srv.nodeType == srv.ELEMENT_NODE and srv.nodeName == 'service':
                Service(srv.attributes['name'].value, \
                            srv.attributes['number'].value, \
                            srv.attributes['script'].value, \
                            srv.attributes['start'].value, \
                            srv.attributes['package'].value)

    init_from_xml = init_from_install_xml
    @staticmethod
    def to_xml(doc, p_node):
        ''' write Service instances into xml
doc - xml document instance
p_node - xml node (parent node)'''
        srvs = doc.createElement('services')
        for s in Service.list:
            srv = doc.createElement('service')
            for n in ('name', 'number', 'script', 'start', 'package'):
                to_xml_attr(doc, srv, s, n)
            srvs.appendChild(srv)
        p_node.appendChild(srvs)

def init():
    ''' initialize '''
    Partition.init_from_os()
    Raid.init_from_os()
    MountPoint.init_from_internal()
    xmldoc_cfg = minidom.parse(config_xml)
    root_cfg   = xmldoc_cfg.firstChild
    Group.init_from_config_xml(root_cfg)
    Service.init_from_config_xml(root_cfg)

def init_from_xml():
    ''' init all classes in this module based input file (install xml) '''
    xmldoc = minidom.parse(install_xml)
    root = xmldoc.firstChild
    for n in root.childNodes:
        if n.nodeType == n.ELEMENT_NODE:
            if n.nodeName == 'serial-number':
                SerialNumber.init_from_xml(n)
            elif n.nodeName == 'partitions':
                Partition.init_from_xml(n)
            elif n.nodeName == 'raids':
                Raid.init_from_xml(n)
            elif n.nodeName == 'mount-points':
                MountPoint.init_from_xml(n)
            elif n.nodeName == 'network':
                Network.init_from_xml(n)
            elif n.nodeName == 'groups':
                Group.init_from_xml(n)
            elif n.nodeName == 'services':
                Service.init_from_xml(n)

def to_xml():
    ''' write internal data into xml file '''
    f = file(install_xml, 'w')
    xmldoc = minidom.Document()
    root   = xmldoc.createElement('install')
    xmldoc.appendChild(root)

    SerialNumber.to_xml(xmldoc, root)
    Partition.to_xml(xmldoc, root)
    Raid.to_xml(xmldoc, root)
    MountPoint.to_xml(xmldoc, root)
    Network.to_xml(xmldoc, root)
    Group.to_xml(xmldoc, root)
    Service.to_xml(xmldoc, root)

    PrettyPrint(xmldoc, f)
    f.close()