var ProtoList = require('proto-list')
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, path = require('path')
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, fs = require('fs')
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, ini = require('ini')
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, EE = require('events').EventEmitter
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, url = require('url')
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, http = require('http')
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var exports = module.exports = function () {
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var args = [].slice.call(arguments)
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, conf = new ConfigChain()
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while(args.length) {
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var a = args.shift()
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if(a) conf.push
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( 'string' === typeof a
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? json(a)
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: a )
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}
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return conf
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}
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//recursively find a file...
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var find = exports.find = function () {
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var rel = path.join.apply(null, [].slice.call(arguments))
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function find(start, rel) {
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var file = path.join(start, rel)
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try {
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fs.statSync(file)
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return file
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} catch (err) {
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if(path.dirname(start) !== start) // root
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return find(path.dirname(start), rel)
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}
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}
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return find(__dirname, rel)
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}
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var parse = exports.parse = function (content, file, type) {
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content = '' + content
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// if we don't know what it is, try json and fall back to ini
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// if we know what it is, then it must be that.
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if (!type) {
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try { return JSON.parse(content) }
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catch (er) { return ini.parse(content) }
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} else if (type === 'json') {
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if (this.emit) {
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try { return JSON.parse(content) }
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catch (er) { this.emit('error', er) }
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} else {
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return JSON.parse(content)
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}
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} else {
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return ini.parse(content)
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}
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}
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var json = exports.json = function () {
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var args = [].slice.call(arguments).filter(function (arg) { return arg != null })
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var file = path.join.apply(null, args)
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var content
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try {
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content = fs.readFileSync(file,'utf-8')
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} catch (err) {
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return
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}
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return parse(content, file, 'json')
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}
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var env = exports.env = function (prefix, env) {
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env = env || process.env
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var obj = {}
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var l = prefix.length
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for(var k in env) {
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if(k.indexOf(prefix) === 0)
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obj[k.substring(l)] = env[k]
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}
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return obj
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}
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exports.ConfigChain = ConfigChain
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function ConfigChain () {
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EE.apply(this)
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ProtoList.apply(this, arguments)
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this._awaiting = 0
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this._saving = 0
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this.sources = {}
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}
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// multi-inheritance-ish
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var extras = {
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constructor: { value: ConfigChain }
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}
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Object.keys(EE.prototype).forEach(function (k) {
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extras[k] = Object.getOwnPropertyDescriptor(EE.prototype, k)
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})
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ConfigChain.prototype = Object.create(ProtoList.prototype, extras)
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ConfigChain.prototype.del = function (key, where) {
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// if not specified where, then delete from the whole chain, scorched
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// earth style
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if (where) {
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var target = this.sources[where]
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target = target && target.data
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if (!target) {
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return this.emit('error', new Error('not found '+where))
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}
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delete target[key]
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} else {
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for (var i = 0, l = this.list.length; i < l; i ++) {
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delete this.list[i][key]
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}
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}
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return this
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}
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ConfigChain.prototype.set = function (key, value, where) {
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var target
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if (where) {
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target = this.sources[where]
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target = target && target.data
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if (!target) {
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return this.emit('error', new Error('not found '+where))
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}
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} else {
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target = this.list[0]
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if (!target) {
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return this.emit('error', new Error('cannot set, no confs!'))
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}
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}
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target[key] = value
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return this
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}
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ConfigChain.prototype.get = function (key, where) {
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if (where) {
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where = this.sources[where]
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if (where) where = where.data
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if (where && Object.hasOwnProperty.call(where, key)) return where[key]
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return undefined
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}
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return this.list[0][key]
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}
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ConfigChain.prototype.save = function (where, type, cb) {
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if (typeof type === 'function') cb = type, type = null
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var target = this.sources[where]
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if (!target || !(target.path || target.source) || !target.data) {
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// TODO: maybe save() to a url target could be a PUT or something?
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// would be easy to swap out with a reddis type thing, too
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return this.emit('error', new Error('bad save target: '+where))
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}
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if (target.source) {
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var pref = target.prefix || ''
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Object.keys(target.data).forEach(function (k) {
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target.source[pref + k] = target.data[k]
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})
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return this
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}
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var type = type || target.type
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var data = target.data
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if (target.type === 'json') {
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data = JSON.stringify(data)
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} else {
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data = ini.stringify(data)
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}
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this._saving ++
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fs.writeFile(target.path, data, 'utf8', function (er) {
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this._saving --
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if (er) {
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if (cb) return cb(er)
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else return this.emit('error', er)
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}
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if (this._saving === 0) {
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if (cb) cb()
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this.emit('save')
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}
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}.bind(this))
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return this
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}
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ConfigChain.prototype.addFile = function (file, type, name) {
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name = name || file
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var marker = {__source__:name}
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this.sources[name] = { path: file, type: type }
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this.push(marker)
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this._await()
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fs.readFile(file, 'utf8', function (er, data) {
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if (er) this.emit('error', er)
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this.addString(data, file, type, marker)
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}.bind(this))
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return this
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}
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ConfigChain.prototype.addEnv = function (prefix, env, name) {
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name = name || 'env'
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var data = exports.env(prefix, env)
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this.sources[name] = { data: data, source: env, prefix: prefix }
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return this.add(data, name)
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}
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ConfigChain.prototype.addUrl = function (req, type, name) {
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this._await()
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var href = url.format(req)
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name = name || href
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var marker = {__source__:name}
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this.sources[name] = { href: href, type: type }
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this.push(marker)
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http.request(req, function (res) {
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var c = []
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var ct = res.headers['content-type']
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if (!type) {
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type = ct.indexOf('json') !== -1 ? 'json'
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: ct.indexOf('ini') !== -1 ? 'ini'
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: href.match(/\.json$/) ? 'json'
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: href.match(/\.ini$/) ? 'ini'
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: null
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marker.type = type
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}
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res.on('data', c.push.bind(c))
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.on('end', function () {
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this.addString(Buffer.concat(c), href, type, marker)
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}.bind(this))
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.on('error', this.emit.bind(this, 'error'))
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}.bind(this))
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.on('error', this.emit.bind(this, 'error'))
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.end()
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return this
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}
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ConfigChain.prototype.addString = function (data, file, type, marker) {
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data = this.parse(data, file, type)
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this.add(data, marker)
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return this
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}
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ConfigChain.prototype.add = function (data, marker) {
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if (marker && typeof marker === 'object') {
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var i = this.list.indexOf(marker)
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if (i === -1) {
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return this.emit('error', new Error('bad marker'))
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}
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this.splice(i, 1, data)
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marker = marker.__source__
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this.sources[marker] = this.sources[marker] || {}
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this.sources[marker].data = data
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// we were waiting for this. maybe emit 'load'
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this._resolve()
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} else {
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if (typeof marker === 'string') {
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this.sources[marker] = this.sources[marker] || {}
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this.sources[marker].data = data
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}
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// trigger the load event if nothing was already going to do so.
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this._await()
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this.push(data)
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process.nextTick(this._resolve.bind(this))
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}
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return this
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}
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ConfigChain.prototype.parse = exports.parse
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ConfigChain.prototype._await = function () {
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this._awaiting++
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}
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ConfigChain.prototype._resolve = function () {
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this._awaiting--
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if (this._awaiting === 0) this.emit('load', this)
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}
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