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import optparse

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import pvl.rrd.graph # interface

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from pvl.rrd import RRDDatabase, RRDCache

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def parser (parser) :

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    """

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        optparse OptionGroup.

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    """

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    parser = optparse.OptionGroup(parser, "RRD options")

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    parser.add_option('--rrd-type', metavar='TYPE', default='collectd',

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        help="mrtg/collectd")

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    parser.add_option('--rrd', metavar='PATH',

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        help="Find RRD files")

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    parser.add_option('--rrd-cache', metavar='PATH',

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        help="Cache RRD graphs")

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    return parser

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def apply (options) :

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    """

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        Return RRDDatabase from options.

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    """

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    # path

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    if not options.rrd :

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        log.error("no --rrd given")

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        sys.exit(2)

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    # type

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    graph_type = pvl.rrd.graph.interface_type(options.rrd_type)

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    # cache

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    if options.rrd_cache :

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        cache = RRDCache(options.rrd_cache)

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    else :

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        cache = None

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    return RRDDatabase(options.rrd, graph_type, cache)

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