dat/index.js at master · sportebois/dat · GitHub

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var path = require('path')
var meta = require(path.join(__dirname, 'lib', 'meta.js'))
var commands = require(path.join(__dirname, 'lib', 'commands'))
var getPort = require(path.join(__dirname, 'lib', 'get-port'))
var backend = require(path.join(__dirname, 'lib', 'backend'))
var request = require('request').defaults({json: true})
var fs = require('fs')
var tty = require('tty')

module.exports = Dat

// new Dat(cb)
// new Dat({foo: bar})
// new Dat({foo: bar}, cb)
// new Dat('./foo)
// new Dat('./foo', cb)
// new Dat('./foo', {foo: bar})
// new Dat('./foo', {foo: bar}, cb)

function Dat(dir, opts, onReady) {
  var self = this

  // if 'new' was not used
  if (!(this instanceof Dat)) return new Dat(dir, opts, onReady)

  if (typeof dir === 'function') {
    onReady = dir
    opts = {}
    dir = process.cwd()
  }

  if (typeof dir === 'object') {
    onReady = opts
    opts = dir
    dir = process.cwd()
  }

  if (typeof opts === 'function') {
    onReady = opts
    opts = {}
  }

  if (!onReady) onReady = function(){}

  // TODO figure out more descriptive names/API for these
  // read dat dir but don't init empty database
  if (typeof opts.init === 'undefined') opts.init = true
  // read dat dir but don't read database
  if (typeof opts.storage === 'undefined') opts.storage = true

  this.lockRetries = 0
  this.retryLimit = 3
  this.dir = dir
  this.opts = opts
  var paths = this.paths()
  this._backend = backend(this)

  if (!opts.storage) {
    self.meta = meta(self, function(err) {
      onReady()
    })
  } else {
    function read() {
      readPort(paths.port, opts, function(err) {
        // ignore err
        loadMeta()
      })
    }
    if (!tty.isatty(0)) setTimeout(read, 2000)
    else read()
  }

  function loadMeta() {
    self.meta = meta(self, function(err) {
      if (err) return init()
      self._storage(opts, function(err) {
        if (err && self.lockRetries < self.retryLimit) {
          readPort(paths.port, opts, function(err) {
            // ignore err
            loadMeta()
          })
          self.lockRetries++
          return
        }
        init()
      })
    })
  }

  function init() {
    commands._ensureExists({ path: dir }, function (err) {
      if (err) {
        if (!opts.init) return serve()
        return self.init(opts, function(err) {
          if (err) return onReady(err)
          if (typeof opts.serve === 'undefined') opts.serve = true
          serve()
        })
      }
      if (typeof opts.serve === 'undefined') opts.serve = true
      return serve()
    })
  }

  function serve() {
    if (opts.serve) {
      self._storage(opts, function(err) {
        if (err) return onReady(err)
        self.serve(opts, onReady)
      })
      return
    }
    onReady()
  }
}

function readPort(portPath, opts, cb) {
  getPort.readPort(portPath, function(err, port) {
    if (err) return cb(err)
    var adminu = opts.adminUser || process.env["DAT_ADMIN_USER"]
    var adminp = opts.adminPass || process.env["DAT_ADMIN_PASS"]
    var creds = ''
    if (adminu && adminp) creds = adminu + ':' + adminp + '@'
    var datAddress = 'http://' + creds + '127.0.0.1:' + port
    request(datAddress + '/_manifest', function(err, resp, json) {
      if (err || !json.methods) {
        // assume PORT to be invalid
        return fs.unlink(portPath, cb)
      }
      // otherwise initialize in networked mode
      opts.serve = false
      opts.remoteAddress = datAddress
      opts.manifest = json
      cb()
    })
  })
}

Dat.prototype = commands