"""
(C) Copyright 2011, 10gen

This is a label on a mattress. Do not modify this file!
"""

# Python
import socket, threading, time

muninAgentVersion = "1.5.7"

def containsStr( val, query ):
    """ Returns true if the value is contained in the string """
    return val.find( query ) > -1

class MuninThread( threading.Thread ):
    """ Pull them munin data from the various hosts. """

    def __init__( self, hostname, mmsAgent ):
        """ Initialize the object """
        self.hostname = hostname
        self.mmsAgent = mmsAgent
        self.logger = mmsAgent.logger
        self.muninNode = MuninNode( self.hostname )
        self.running = True
        threading.Thread.__init__( self )

    def run( self ):
        """ Pull the munin data from the various hosts. """

        self.logger.info( 'starting munin monitoring: ' + self.hostname + ':4949' )

        sleepTime = ( self.mmsAgent.collectionInterval / 2 ) - 1

        if ( sleepTime < 1 ):
            sleepTime = 1

        while not self.mmsAgent.done and self.mmsAgent.hasUniqueServer( self.hostname ) and self.running:
            try:
                time.sleep( sleepTime )
                self._collectAndSetState()
            except:
                pass

        self.logger.info( 'stopping munin monitoring: ' + self.hostname + ':4949' )

    def stopThread( self ):
        """ Stop the thread. This sets a running flag to false """
        self.running = False

    def _collectAndSetState( self ):
        """ Collect the data and set the state """
        muninStats = self._collectStats()

        if muninStats is None:
            return

        muninStats['host'] = self.hostname

        self.mmsAgent.setMuninHostState( self.hostname, muninStats )

    def _collectStats( self ):
        """ Collect the data from the munin host """
        try:
            return self.muninNode.fetchAndConfigMany( [ "cpu" , "iostat" , "iostat_ios" ] )
        except:
            return None

class MuninNode( object ):
    """ The Munin node collection object """

    def __init__( self, host='127.0.0.1', port=4949 ):
        """ Constructor """
        self.host = host
        self.port = port

    def _send( self, cmd, sock ):
        """ Send a command to Munin """
        sock.send( cmd + "\r\n" )

    def _readline( self, f ):
        """ Read data from vendor.munin """
        return f.readline().split("\n")[0]

    def list( self, sock, f ):
        """ Run a list operation """
        self._send( 'list', sock )
        s = self._readline( f )
        return s.split( ' ' )

    def config( self, cmd, sock, f ):
        """ Run a config operation """
        return self._data( 'config', cmd, sock, f )

    def fetch( self, cmd, sock, f ):
        """ Run a fetch operation """
        return self._data( 'fetch', cmd, sock, f )

    def _data(  self, cmdType, cmd, sock, f ):
        """ Collect data """
        self._send( cmdType + ' ' + cmd, sock )
        data = []
        while True:
            s = self._readline( f )
            if s == ".":
                break

            if cmdType == 'config':
                if containsStr( s, '.label' ) == False:
                    continue

            data.append( s )
        return data

    def connect( self ):
        """ Connect to the Munin node """
        sock = socket.socket( socket.AF_INET, socket.SOCK_STREAM )
        sock.connect( ( self.host, self.port ) )

        f = sock.makefile()

        if not f:
            try:
                sock.close()
            except:
                pass

            raise Exception( 'Error reading data from socket' )

        banner = f.readline() # banner

        if len( banner ) == 0:
            raise Exception( 'Unable to connect to Munin' )

        return ( sock, f )

    def disconnect( self, sock, f ):
        """ Disconnect from vendor.munin """
        try:
            try:
                self._send( 'quit', sock )
            finally:
                sock.close()
        finally:
            if f is not None:
                f.close()

    def fetchAndConfigMany( self, cmdTypes ):
        """ The fetch and config many cmds - opens and closes the connection """
        sock = None
        f = None
        try:
            sock, f = self.connect()
            fetch = {}
            config = {}
            for t in cmdTypes:
                fetch[t] = self.fetch( t, sock, f )

                if ( t == 'cpu' ):
                    config[t] = { }
                else:
                    config[t] = self.config( t, sock, f )

            return { 'fetch' : fetch, 'config' : config }
        finally:
            try:
                self.disconnect( sock, f )
            except:
                pass