console.js

// Copyright 2011 Iris Couch
//
//    Licensed under the Apache License, Version 2.0 (the "License");
//    you may not use this file except in compliance with the License.
//    You may obtain a copy of the License at
//
//        http://www.apache.org/licenses/LICENSE-2.0
//
//    Unless required by applicable law or agreed to in writing, software
//    distributed under the License is distributed on an "AS IS" BASIS,
//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//    See the License for the specific language governing permissions and
//    limitations under the License.

var fs = require('fs')
var util = require('util')


module.exports = {}
module.exports.log = noop
module.exports.debug = noop
module.exports.info = noop
module.exports.warn = noop
module.exports.error = noop

var LOG_PATH = '/tmp/couchjs.log'
  , stat = null
  , LOG = null

try {
  stat = fs.statSync(LOG_PATH)
} catch(er) {}

if(stat) {
  LOG = fs.createWriteStream(LOG_PATH, {'flags':'a'})

  module.exports.log = log
  module.exports.debug = log
  module.exports.info = log
  module.exports.warn = log
  module.exports.error = log

  process.on('exit', function() {
    module.exports.log('Exit %d', process.pid)
  })

  process.on('uncaughtException', on_err)
}

function log() {
  var str = util.format.apply(this, arguments)
  LOG.write(str + '\n')
}

function on_err(er) {
  module.exports.error('Uncaught error:\n%s', er.stack || er.message || JSON.stringify(er))

  if(er.stack)
    er = ['fatal', 'unknown_error', er.stack]

  process.stdout.write(JSON.stringify(er) + '\n')
  process.exit(1)
}

function noop() {}