couchdb_disk_size

#!/usr/bin/env node
// Munin plugin for CouchDB database disk sizes

// Magic Markers for auto-configuration
// #%# family=auto
// #%# capabilities=autoconf suggest

var sys = require("sys")
  , fs = require("fs")
  , path = require("path")

fs.realpath(__filename, function(err, realpath) {
  require.paths.unshift(path.dirname(realpath) + "/vendor")

  var cradle = require("cradle")
    , conn = new(cradle.Connection)
    , mode = "fetch"

  // could be "config" or "autoconf" mode
  if (process.argv[2] !== undefined) mode = process.argv[2]

  conn.databases(function(err, dbs) {
    if (mode === 'autoconf') {
      if (!err) {
        sys.puts("yes")
      } else {
        sys.puts("no")
        process.exit(1)
      }
    } else {
      if (err) throw err

      if (mode === 'config') {
        sys.puts("graph_title CouchDB db disk sizes")
        sys.puts("graph_args --base 1024")
        sys.puts("graph_vlabel Disk sizes in Megabytes")
        sys.puts("graph_category couchdb")
      }

      dbs.forEach(function(db, idx) {
        if (mode === 'config') {
          sys.puts(db + "_disk_size.label " + db)
          sys.puts(db + "_disk_size.draw " + (idx ? "STACK" : "AREA"))
        } else {
          conn.database(db).info(function (err, info) {
            if (err) {
              sys.puts(db + "_disk_size.value U")
            } else {
              sys.puts(db + "_disk_size.value " + (info.disk_size || 0))
            }
          })
        }
      })
    }
  })
})