#!/usr/bin/python

'''CTS: Cluster Testing System: heartbeat dependent modules...

Classes related to testing high-availability clusters...

Lots of things are implemented.

Lots of things are not implemented.

We have many more ideas of what to do than we've implemented.
 '''

__copyright__='''
Copyright (C) 2000,2001,2005 Alan Robertson <alanr@unix.sh>
Licensed under the GNU GPL.
'''

#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, see <http://www.gnu.org/licenses/>.

from CTS import *


class HeartbeatCM(ClusterManager):
    '''
    The heartbeat cluster manager class.
    It implements the things we need to talk to and manipulate
    heartbeat clusters
    '''

    def __init__(self, Environment, randseed=None):

        self.ResourceDirs = ["/etc/ha.d/resource.d", "/etc/rc.d/init.d", "/etc/rc.d/"]
        self.ResourceFile = Environment["HAdir"] + "/haresources"
        self.ConfigFile = Environment["HAdir"]+ "/ha.cf"
        ClusterManager.__init__(self, Environment, randseed=randseed)
        self.update({
            "Name"           : "heartbeat",
            "DeadTime"       : 30,
            "StableTime"     : 30,
            "StartCmd"       : "/usr/lib/heartbeat/ha_logd -d >/dev/null 2>&1; MALLOC_CHECK_=2 /usr/lib/heartbeat/heartbeat >/dev/null 2>&1",
            "StopCmd"        : "/usr/lib/heartbeat/heartbeat -k",
            "StatusCmd"      : "/usr/lib/heartbeat/heartbeat -s",
            "RereadCmd"      : "/usr/lib/heartbeat/heartbeat -r",
            "StartDRBDCmd"   : "/etc/init.d/drbd start >/dev/null 2>&1",
            "StopDRBDCmd"    : "/etc/init.d/drbd stop",
            "StatusDRBDCmd"  : "/etc/init.d/drbd status",
            "DRBDCheckconf"  : "/etc/init.d/drbd checkconfig >/var/run/drbdconf 2>&1",
            "BreakCommCmd"   : "/usr/share/heartbeat/TestHeartbeatComm break-communication >/dev/null 2>&1",
            "FixCommCmd"     : "/usr/share/heartbeat/TestHeartbeatComm fix-communication >/dev/null 2>&1",
            "DelFileCommCmd" : "/usr/share/heartbeat/TestHeartbeatComm delete-testingfile >/dev/null 2>&1",
            "SaveFileCmd"    : "/usr/share/heartbeat/TestHeartbeatComm save-testingfile /tmp/OnlyForTesting >/dev/null 2>&1",
            "ReduceCommCmd"  : "/usr/share/heartbeat/TestHeartbeatComm reduce-communication %s %s>/dev/null 2>&1",
            "RestoreCommCmd" : "/usr/share/heartbeat/TestHeartbeatComm restore-communication /tmp/OnlyForTesting >/dev/null 2>&1",
            "IPaddrCmd"      : "/etc/ha.d/resource.d/IPaddr %s status",
            "Standby"        : "/usr/share/heartbeat/hb_standby >/dev/null 2>&1",
            "TestConfigDir"  : "/etc/ha.d/testconfigs",
            "LogFileName"    : Environment["LogFileName"],

            # Patterns to look for in the log files for various occasions...
            "Pat:We_started"       : " (%s) .* Initial resource acquisition complete",
            "Pat:They_started"     : " (%s) .* Initial resource acquisition complete",
            "Pat:We_stopped"       : "%s heartbeat.*Heartbeat shutdown complete",
            "Pat:Logd_stopped"     : "%s logd:.*Exiting write process",
            "Pat:They_stopped"     : "%s heartbeat.*node (%s).*: is dead",
            "Pat:They_dead"        : "node (%s).*: is dead",
            "Pat:All_stopped"      : " (%s).*heartbeat.*Heartbeat shutdown complete",
            "Pat:StandbyOK"        : "Standby resource acquisition done",
            "Pat:StandbyNONE"      : "No reply to standby request",
            "Pat:StandbyTRANSIENT" : "standby message.*ignored.*in flux",
            "Pat:Return_partition" : "Cluster node %s returning after partition",

            # Bad news Regexes.  Should never occur.
            "BadRegexes"   : (
                r"Shutting down\.",
                     r"Forcing shutdown\.",
                     r"Both machines own .* resources!",
                     r"No one owns .* resources!",
                     r", exiting\.",
                     r"ERROR:",
                     r"CRIT.*:",
            ),
        })
        
        self.cf=HBConfig(Environment["HAdir"])
        self._finalConditions()

    def SetClusterConfig(self, configpath="default", nodelist=None):
        '''Activate the named test configuration throughout the cluster.
        This code is specialized to heartbeat.
        '''
        rc=1
        Command='''
        cd %s%s%s;                : cd to test configuration directory
        for j in *
        do
          if
            [ -f "/etc/ha.d/$j" ];
          then
            if
              cmp $j /etc/ha.d/$j >/dev/null 2>&1;
            then
              : Config file $j is already up to correct.
            else
              echo "Touching $j"
              cp $j /etc/ha.d/$j
            fi
          fi
        done
        ''' % (self["TestConfigDir"], os.sep, configpath)

        if nodelist == None:
            nodelist=self.Env["nodes"]
        for node in nodelist:
            if not self.rsh(node, Command): rc=None

        self.rereadall()
        return rc


    def ResourceGroups(self):
        '''
        Return the list of resources groups defined in this configuration.

        This code is specialized to heartbeat.
        We make the assumption that the resource file on the local machine
        is the same as that of a cluster member.

        We aren't necessarily a member of the cluster
        (In fact, we usually aren't).
        '''
        RscGroups=[]
        file = open(self.ResourceFile, "r")
        while (1):

            line = file.readline()
            if line == "":   break

            idx=string.find(line, '#')
            if idx >= 0:
                line=line[:idx]
            if line == "":    continue
            line = string.strip(line)

            # Is this wrong?
            tokens = re.split("[ \t]+", line)

            # Ignore the default server for this resource group
            del tokens[0]

            Group=[]
            for token in tokens:
                if token != "":
                    idx=string.find(token, "::")
                    if idx > 0:
                        tuple=string.split(token, "::")
                    else:
                        #
                        # Is this an IPaddr default resource type?
                        #
                        if re.match("^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$"
                        ,        token):
                            tuple=["IPaddr", token]
                        else:
                            tuple = [token, None]
                    Resource = self.hbResource(tuple[0], tuple[1])
                    Group.append(Resource)

            RscGroups.append(Group)
            
        file.close()
        return RscGroups

    def InternalCommConfig(self):
        '''
        Return a list of communication  paths. Each path consists of a tuple like this:
               mediatype                serial | ip
               interface/dev name       eth0 | /dev/ttyS0...
               protocol                 tcp?? | udp | None 
               port                     Number | None
        '''

        Path = {"mediatype" : None, "interface": None, "protocol" : None, "port": None}
        cf = self.cf
        for cfp in cf.Parameters:
            if cfp == "serial":
                if Path["mediatype"] == None:
                     Path["mediatype"] = ["serial"]
                else: Path["mediatype"].append("serial")

                if Path["interface"] == None:
                     Path["interface"] = cf.Parameters["serial"]
                else:
                    for serial in cf.Parameters["serial"]:
                         Path["interface"].append(serial)

            if cfp == "bcast" or cfp == "mcast" or cfp == "ucast" :
                if Path["mediatype"] == None:
                    Path["mediatype"] = ["ip"]
                else: Path["mediatype"].append("ip")

                if cfp == "bcast":
                    interfaces = cf.Parameters[cfp]
                if cfp == "ucast":
                    interfaces = [cf.Parameters[cfp][0]]
                if cfp == "mcast":
                    Path["port"] = [cf.Parameters[cfp][0][2]]
                    Path["protocol"] = "udp"
                    interfaces = [cf.Parameters[cfp][0][0]]

                if Path["interface"] == None:
                   Path["interface"] = interfaces
                else:
                    for interface in interfaces:
                        if interface not in Path["interface"]:
                            Path["interface"].append(interface)

            if cfp == "udpport":
                Path["port"] = cf.Parameters["udpport"]
                Path["protocol"] = ["udp"]

            if Path["port"] == None:
                Path["port"] = [694]

        return Path
                
    def HasQuorum(self, node_list):
        (
'''Return TRUE if the cluster currently has quorum.  According to
current heartbeat code this means one node is up.
''')
        return self.upcount() >= 1

    def hbResource(self, type, instance):
        '''
        Our job is to create the right kind of resource.  For most
        resources, we just create an HBResource object, but for
        IP addresses, we create an HBipResource instead.
        Some other types of resources may also be added as special
        cases.
        '''

        if type == "IPaddr":
            return HBipResource(self, type, instance)

        return HBResource(self, type, instance)


class HBResource(Resource):

    def IsRunningOn(self, nodename):
        '''
        This member function returns true if our resource is running
        on the given node in the cluster.
        We call the status operation for the resource script.
        '''

        return self._ResourceOperation("status", "OK|running", nodename)

    def _ResourceOperation(self, operation, pattern, nodename):
        '''
        We call the requested operation for the resource script.
        We don't care what kind of operation we were called to do
        particularly.
        When we were created, we were bound to a cluster manager, which
        has its own remote execution method (which we use here).
        '''
        if self.Instance == None:
            instance = ""
        else:
            instance = self.Instance

        Rlist = 'LIST="'
        for dir in self.CM.ResourceDirs:
          Rlist = Rlist + " " + dir
        Rlist = Rlist + '"; '

        Script= Rlist + '''
        T="''' + self.ResourceType + '''";
        I="''' + instance + '''";
        for dir in $LIST;
        do
          if
            [ -f "$dir/$T" -a  -x "$dir/$T" ]
          then
            "$dir/$T" $I ''' + operation + '''
            exit $?
          fi
        done 2>&1;
        exit 1;'''

        #print "Running " + Script + "\n"

        line = self.CM.rsh.readaline(nodename, Script)
        if operation == "status":
          if re.search(pattern, line):
              return 1
        return self.CM.rsh.lastrc == 0

    def Start(self, nodename):
        '''
        This member function starts or activates the resource.
        '''
        return self._ResourceOperation("start", None, nodename)

    def Stop(self, nodename):
        '''
        This member function stops or deactivates the resource.
        '''
        return self._ResourceOperation("stop", None, nodename)

        
#    def IsWorkingCorrectly(self, nodename):
#        "We default to returning TRUE for this one..."
#        if self.Instance == None:
#          self.CM.log("Faking out: " + self.ResourceType)
#        else:
#          self.CM.log("Faking out: " + self.ResourceType + self.Instance)
#        return 1

    def IsWorkingCorrectly(self, nodename):
        return self._ResourceOperation("monitor", "OK", nodename)

class HBipResource(HBResource):
    '''
    We are a specialized IP address resource which knows how to test
    to see if our resource type is actually being served.
    We are cheat and run the IPaddr resource script on
    the current machine, because it's a more interesting case.
    '''

    def IsWorkingCorrectly(self, nodename):
        return self._ResourceOperation("monitor", "OK", self.CM.OurNode)



#
#        A heartbeat configuration class...
#        It reads and parses the heartbeat config
#        files
#

class HBConfig:

    # Which options have multiple words on the line?
    MultiTokenKeywords = {"mcast" : None , "stonith_host": None}

    def __init__(self, configdir="/etc/ha.d"):
        self.Parameters = {}
        self.ResourceGroups = {}

        self._ReadConfig(os.path.join(configdir, "ha.cf"))
        
        FirstUp_NodeSelection()
        LastUp_NodeSelection()
        no_failback = NoAutoFailbackPolicy()
        auto_failback = AutoFailbackPolicy()

        #
        # We allow each resource group to have its own failover/back
        # policies
        #
        if "nice_failback" in self.Parameters         \
        and                self.Parameters["nice_failback"] == "on":
            HBConfig.DefaultFailbackPolicy = no_failback
        elif "auto_failback" in self.Parameters         \
        and                self.Parameters["auto_failback"] == "off":
            HBConfig.DefaultFailbackPolicy = no_failback
        else:
            HBConfig.DefaultFailbackPolicy = auto_failback
        HBConfig.DefaultNodeSelectionPolicy = NodeSelectionPolicies["FirstUp"]

        self._ReadResourceGroups(os.path.join(configdir, "haresources"))

    # Read ha.cf config file
    def _ReadConfig(self, ConfigFile):
        self.ConfigPath = ConfigFile;
        fp = open(ConfigFile)

        while 1:
            line=fp.readline()
            if not line:
                return
            line = re.sub("#.*", "", line)
            line = string.rstrip(line)
            if len(line) < 1:
                continue
            tokens = line.split()
            key = tokens[0]
            values = tokens[1:]

            if key in HBConfig.MultiTokenKeywords:
                # group items from this line together, and separate
                # from the items on other lines
                values = [values]
            if key in self.Parameters:
                if key == "node":
                    self.Parameters[key].extend(values)
                else:
                    self.Parameters[key].append(values[0])
            else:
                self.Parameters[key] = values

    # Read a line from the haresources file...
    # - allow for \ continuations...
    def _GetRscLine(self, fp):
        linesofar = None
        continuation=1
        while continuation:
            continuation = 0
            line=fp.readline()
            if not line:
                break
            line = re.sub("#.*", "", line)

            if line[len(line)-2] == "\\":
               line = line[0:len(line)-2] + "\n"
               continuation=1

            if linesofar == None:
                linesofar = line
            else:
                linesofar = linesofar + line
        return linesofar


    def _ReadResourceGroups(self, RscFile):
        self.RscPath = RscFile;
        fp = open(RscFile)

        thisline = ""
        while 1:
            line=self._GetRscLine(fp)
            if not line:
                return
            line = line.strip()
            if len(line) < 1:
                continue
            tokens = line.split()
            node = tokens[0]
            resources = tokens[1:]
            rscargs=[]
            for resource in resources:
                name=resource.split("::", 1)
                if len(name) > 1:
                    args=name[1].split("::")
                else:
                    args=None
                name = name[0]
                rscargs.append(Resource(name, args))
            name = tokens[0] + "__" + tokens[1]

            assert name not in self.ResourceGroups

            #
            #        Create the resource group
            #
            self.ResourceGroups[name] = ResourceGroup(name \
            ,        rscargs
            ,        node.split(",")
                # Provide default value
            ,        HBConfig.DefaultNodeSelectionPolicy
            ,        HBConfig.DefaultFailbackPolicy)
#
#        Return the list of nodes in the cluster...
#

    def nodes(self):
        result = self.Parameters["node"]
        result.sort()
        return result

class ClusterState:
    pass

class ResourceGroup:
    def __init__(self, name, resourcelist, possiblenodes
    ,        nodeselection_policy, failback_policy):
        self.name = name
        self.resourcelist = resourcelist
        self.possiblenodes = possiblenodes
        self.nodeselection_policy = nodeselection_policy
        self.failback_policy = failback_policy
        self.state = None
        self.attributes = {}
        self.history = []

    def __str__(self):
        result = string.join(self.possiblenodes, ",")
        for rsc in self.resourcelist:
            result = result + " " + str(rsc)
        return result

class Resource:
    def __init__(self, name, arguments=None):
        self.name = name
        self.arguments = arguments

    def __str__(self):
        result = self.name
        try:
            for arg in self.arguments:
                result = result + "::" + arg
        except TypeError:
            pass
        return result


#######################################################################
#
#        Base class defining policies for where we put resources
#        when we're starting, or when a failure has occurred...
#
#######################################################################
NodeSelectionPolicies = {}

class NodeSelectionPolicy:
    def __init__(self, name):
        self.name = name
        NodeSelectionPolicies[name] = self

    def name(self):
        return self.name

#
#        nodenames: the list of nodes eligible to run this resource
#        ResourceGroup:        the group to be started...
#        ClusterState:        Cluster state information
#
    def SelectNode(self, nodenames, ResourceGroup, ClusterState):
        return None

#
#        Choose the first node in the list...
#
class FirstUp_NodeSelection(NodeSelectionPolicy):
    def __init__(self):
        NodeSelectionPolicy.__init__(self, "FirstUp")

    def SelectNode(self, nodenames, ResourceGroup, ClusterState):
        return nodenames[0]

#
#        Choose the last node in the list...
#        (kind of a dumb example)
#
class LastUp_NodeSelection(NodeSelectionPolicy):
    def __init__(self):
        NodeSelectionPolicy.__init__(self, "LastUp")

    def SelectNode(self, nodenames, ResourceGroup, ClusterState):
        return nodenames[len(nodenames)-1]

#######################################################################
#
#        Failback policies...
#
#        Where to locate a resource group when an eligible node rejoins
#        the cluster...
#
#######################################################################
FailbackPolicies = {}

class FailbackPolicy:
    def __init__(self, name):
        self.name = name
        FailbackPolicies[name] = self

    def name(self):
        return self.name

        #
        # currentnode:  The node the service is currently on
        # returningnode:  The node which just rejoined
        # eligiblenodes:  Permitted nodes which are up
        # SelectionPolicy:  the normal NodeSelectionPolicy
        # Cluster state information...
        #
    def SelectNewNode(self, currentnode, returningnode, eligiblenodes
    ,                SelectionPolicy, ResourceGroup, ClusterState):
        return None

#
#        This FailbackPolicy is like "normal failback" in heartbeat
#
class AutoFailbackPolicy(FailbackPolicy):
    def __init__(self):
        FailbackPolicy.__init__(self, "failback")

    def SelectNewNode(self, currentnode, returningnode, eligiblenodes
    ,                SelectionPolicy, ResourceGroup, ClusterState):

        # Select where it should run based on current normal policy
        # just as though we were starting it for the first time.

        return SelectionPolicy(eligiblenodes, ResourceGroup, ClusterState)
#
#        This FailbackPolicy is like "nice failback" in heartbeat
#
class NoAutoFailbackPolicy(FailbackPolicy):
    def __init__(self):
        FailbackPolicy.__init__(self, "failuresonly")

    def SelectNewNode(self, currentnode, returningnode, eligiblenodes
    ,                SelectionPolicy, ResourceGroup):

        # Always leave the resource where it is...

        return currentnode


#######################################################################
#
#   A little test code...
#
#   Which you are advised to completely ignore...
#
#######################################################################
if __name__ == '__main__': 
        FirstUp_NodeSelection()
        LastUp_NodeSelection()

        no_failback = NoAutoFailbackPolicy()
        auto_failback = AutoFailbackPolicy()
        

        cf=HBConfig("/etc/ha.d")


        print("Cluster configuration:\n")

        print(("Nodes:", cf.nodes(), "\n"))
        print(("Config Parameters:", cf.Parameters, "\n"))

        for groupname in list(cf.ResourceGroups.keys()):
            print(("Resource Group %s:\n\t%s\n" % (groupname, cf.ResourceGroups[groupname])))
