index.js

'use strict'

var logger  = require('./lib/logger.js')
  , message
  , agent


var agentVersion = require('./package.json').version
logger.trace("Using New Relic for Node.js version %s.", agentVersion)


try {
  logger.debug("Process was running %s seconds before agent was loaded.",
               process.uptime())

  if (process.version && process.version.split('.')[1] < 6) {
    message = "New Relic for Node.js requires a version of Node equal to or\n" +
              "greater than 0.6.0. Not starting!"

    logger.error(message)
    throw new Error(message)
  }

  logger.debug("Current working directory at module load is %s.", process.cwd())
  logger.debug("Process title is %s.", process.title)
  logger.debug("Application was invoked as %s.", process.argv.join(' '))

  /* Loading the configuration can throw if a configuration file isn't found and
   * the environment variable NEW_RELIC_NO_CONFIG_FILE isn't set.
   */
  var config = require('./lib/config.js').initialize()
  if (!config.agent_enabled) {
    logger.info("Module not enabled in configuration; not starting.")
  }
  else {
    /* Only load the rest of the module if configuration is available and the
     * configurator didn't throw.
     *
     * The agent must be a singleton, or else module loading will be patched
     * multiple times, with undefined results. New Relic's instrumentation
     * can't be enabled or disabled without an application restart.
     */
    var Agent = require('./lib/agent.js')
    agent = new Agent(config)
    var appNames = agent.config.applications()

    if (appNames.length < 1) {
      message = "New Relic requires that you name this application!\n" +
                "Set app_name in your newrelic.js file or set environment variable\n" +
                "NEW_RELIC_APP_NAME. Not starting!"
      logger.error(message)
      throw new Error(message)
    }

    var shimmer = require('./lib/shimmer.js')
    shimmer.patchModule(agent)
    shimmer.bootstrapInstrumentation(agent)

    agent.start(function cb_start(error) {
      if (!error) return logger.debug("New Relic for Node.js is connected to New Relic.")

      var message = "New Relic for Node.js halted startup due to an error:"
      logger.error(error, message)

      console.error(message)
      console.error(error.stack)
    })
  }
}
catch (error) {
  var message = "New Relic for Node.js was unable to bootstrap itself due to an error:"
  logger.error(error, message)

  console.error(message)
  console.error(error.stack)
}

var API
if (agent) {
  API = require('./api.js')
}
else {
  API = require('./stub_api.js')
}
module.exports = new API(agent)