#!/usr/bin/env python
# -*- coding: utf-8 -*-

from vendor.munin.mongodb import MuninMongoDBPlugin

class MongoDBIndexMissesPlugin(MuninMongoDBPlugin):
    args = "-l 0 --base 1000"
    vlabel = "misses"
    title = "MongoDB index misses"
    info = "Number of index cache misses"
    fields = (
        ('misses', dict(
            label = "misses",
            info = "Index cache misses",
            type = "DERIVE",
            min = "0",
        )),
    )

    def execute(self):
        status = self.connection.admin.command('serverStatus')
        try:
            value = status['indexCounters']['misses']
        except KeyError:
            value = "U"
        return dict(misses=value)

if __name__ == "__main__":
    MongoDBIndexMissesPlugin().run()