couchdb_httpd_request_methods

#!/usr/bin/env node
// Munin plugin for CouchDB request methods

// 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"
    , verbs = ['GET', 'PUT', 'POST', 'DELETE', 'COPY', 'HEAD', 'MOVE']

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

  if (mode === 'config') {
    sys.puts("graph_title CouchDB httpd request methods")
    sys.puts("graph_args --base 1000")
    sys.puts("graph_vlabel requests / \${graph_period}")
    sys.puts("graph_category couchdb")

    verbs.forEach(function(verb, idx) {
      sys.puts(verb + ".label HTTP " + verb)
      sys.puts(verb + ".type COUNTER")
      sys.puts(verb + ".min 0")
      sys.puts(verb + ".max 1000000")
      sys.puts(verb + ".draw " + (idx ? "STACK" : "AREA"))
    })
  } else {
    conn.stats(function(err, stats) {
      if (mode === 'autoconf') {
        if (!err) {
          sys.puts("yes")
        } else {
          sys.puts("no")
          process.exit(1)
        }
      } else {
        verbs.forEach(function(verb) {
          if (err || typeof stats.httpd_request_methods[verb] === "undefined") {
            sys.puts(verb + ".value U")
          } else {
            sys.puts(verb + ".value " + (stats.httpd_request_methods[verb].mean || 0))
          }
        })
      }
    })
  }
})