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/*
* provider.js: Abstraction providing an interface into pluggable configuration storage.
*
* (C) 2011, Nodejitsu Inc.
*
*/
var async = require('async'),
common = require('./common');
//
// ### function Provider (options)
// #### @options {Object} Options for this instance.
// Constructor function for the Provider object responsible
// for exposing the pluggable storage features of `nconf`.
//
var Provider = exports.Provider = function (options) {
//
// Setup default options for working with `stores`,
// `overrides`, `process.env` and `process.argv`.
//
options = options || {};
this.stores = {};
this.sources = [];
this.init(options);
};
//
// Define wrapper functions for using basic stores
// in this instance
//
['argv', 'env'].forEach(function (type) {
Provider.prototype[type] = function (options) {
return this.add(type, options);
};
});
//
// ### function file (key, options)
// #### @key {string|Object} Fully qualified options, name of file store, or path.
// #### @path {string|Object} **Optional** Full qualified options, or path.
// Adds a new `File` store to this instance. Accepts the following options
//
// nconf.file({ file: '.jitsuconf', dir: process.env.HOME, search: true });
// nconf.file('path/to/config/file');
// nconf.file('userconfig', 'path/to/config/file');
// nconf.file('userconfig', { file: '.jitsuconf', search: true });
//
Provider.prototype.file = function (key, options) {
if (arguments.length == 1) {
options = typeof key === 'string' ? { file: key } : key;
key = 'file';
}
else {
options = typeof options === 'string'
? { file: options }
: options;
}
options.type = 'file';
return this.add(key, options);
};
//
// Define wrapper functions for using
// overrides and defaults
//
['defaults', 'overrides'].forEach(function (type) {
Provider.prototype[type] = function (options) {
options = options || {};
if (!options.type) {
options.type = 'literal';
}
return this.add(type, options);
};
});
//
// ### function use (name, options)
// #### @type {string} Type of the nconf store to use.
// #### @options {Object} Options for the store instance.
// Adds (or replaces) a new store with the specified `name`
// and `options`. If `options.type` is not set, then `name`
// will be used instead:
//
// provider.use('file');
// provider.use('file', { type: 'file', filename: '/path/to/userconf' })
//
Provider.prototype.use = function (name, options) {
options = options || {};
var type = options.type || name;
function sameOptions (store) {
return Object.keys(options).every(function (key) {
return options[key] === store[key];
});
}
var store = this.stores[name],
update = store && !sameOptions(store);
if (!store || update) {
if (update) {
this.remove(name);
}
this.add(name, options);
}
return this;
};
//
// ### function add (name, options)
// #### @name {string} Name of the store to add to this instance
// #### @options {Object} Options for the store to create
// Adds a new store with the specified `name` and `options`. If `options.type`
// is not set, then `name` will be used instead:
//
// provider.add('memory');
// provider.add('userconf', { type: 'file', filename: '/path/to/userconf' })
//
Provider.prototype.add = function (name, options) {
options = options || {};
var type = options.type || name;
if (!require('../nconf')[common.capitalize(type)]) {
throw new Error('Cannot add store with unknown type: ' + type);
}
this.stores[name] = this.create(type, options);
if (this.stores[name].loadSync) {
this.stores[name].loadSync();
}
return this;
};
//
// ### function remove (name)
// #### @name {string} Name of the store to remove from this instance
// Removes a store with the specified `name` from this instance. Users
// are allowed to pass in a type argument (e.g. `memory`) as name if
// this was used in the call to `.add()`.
//
Provider.prototype.remove = function (name) {
delete this.stores[name];
return this;
};
//
// ### function create (type, options)
// #### @type {string} Type of the nconf store to use.
// #### @options {Object} Options for the store instance.
// Creates a store of the specified `type` using the
// specified `options`.
//
Provider.prototype.create = function (type, options) {
return new (require('../nconf')[common.capitalize(type.toLowerCase())])(options);
};
//
// ### function init (options)
// #### @options {Object} Options to initialize this instance with.
// Initializes this instance with additional `stores` or `sources` in the
// `options` supplied.
//
Provider.prototype.init = function (options) {
var self = this;
//
// Add any stores passed in through the options
// to this instance.
//
if (options.type) {
this.add(options.type, options);
}
else if (options.store) {
this.add(options.store.name || options.store.type, options.store);
}
else if (options.stores) {
Object.keys(options.stores).forEach(function (name) {
var store = options.stores[name];
self.add(store.name || name || store.type, store);
});
}
//
// Add any read-only sources to this instance
//
if (options.source) {
this.sources.push(this.create(options.source.type || options.source.name, options.source));
}
else if (options.sources) {
Object.keys(options.sources).forEach(function (name) {
var source = options.sources[name];
self.sources.push(self.create(source.type || source.name || name, source));
});
}
};
//
// ### function get (key, callback)
// #### @key {string} Key to retrieve for this instance.
// #### @callback {function} **Optional** Continuation to respond to when complete.
// Retrieves the value for the specified key (if any).
//
Provider.prototype.get = function (key, callback) {
//
// If there is no callback we can short-circuit into the default
// logic for traversing stores.
//
if (!callback) {
return this._execute('get', 1, key, callback);
}
//
// Otherwise the asynchronous, hierarchical `get` is
// slightly more complicated because we do not need to traverse
// the entire set of stores, but up until there is a defined value.
//
var current = 0,
names = Object.keys(this.stores),
self = this,
response,
mergeObjs = [];
async.whilst(function () {
return typeof response === 'undefined' && current < names.length;
}, function (next) {
var store = self.stores[names[current]];
current++;
if (store.get.length >= 2) {
return store.get(key, function (err, value) {
if (err) {
return next(err);
}
response = value;
// Merge objects if necessary
if (typeof response === 'object' && !Array.isArray(response)) {
mergeObjs.push(response);
response = undefined;
}
next();
});
}
response = store.get(key);
// Merge objects if necessary
if (typeof response === 'object' && !Array.isArray(response)) {
mergeObjs.push(response);
response = undefined;
}
next();
}, function (err) {
if (!err && mergeObjs.length) {
response = common.merge(mergeObjs.reverse());
}
return err ? callback(err) : callback(null, response);
});
};
//
// ### function set (key, value, callback)
// #### @key {string} Key to set in this instance
// #### @value {literal|Object} Value for the specified key
// #### @callback {function} **Optional** Continuation to respond to when complete.
// Sets the `value` for the specified `key` in this instance.
//
Provider.prototype.set = function (key, value, callback) {
return this._execute('set', 2, key, value, callback);
};
//
// ### function reset (callback)
// #### @callback {function} **Optional** Continuation to respond to when complete.
// Clears all keys associated with this instance.
//
Provider.prototype.reset = function (callback) {
return this._execute('reset', 0, callback);
};
//
// ### function clear (key, callback)
// #### @key {string} Key to remove from this instance
// #### @callback {function} **Optional** Continuation to respond to when complete.
// Removes the value for the specified `key` from this instance.
//
Provider.prototype.clear = function (key, callback) {
return this._execute('clear', 1, key, callback);
};
//
// ### function merge ([key,] value [, callback])
// #### @key {string} Key to merge the value into
// #### @value {literal|Object} Value to merge into the key
// #### @callback {function} **Optional** Continuation to respond to when complete.
// Merges the properties in `value` into the existing object value at `key`.
//
// 1. If the existing value `key` is not an Object, it will be completely overwritten.
// 2. If `key` is not supplied, then the `value` will be merged into the root.
//
Provider.prototype.merge = function () {
var self = this,
args = Array.prototype.slice.call(arguments),
callback = typeof args[args.length - 1] === 'function' && args.pop(),
value = args.pop(),
key = args.pop();
function mergeProperty (prop, next) {
return self._execute('merge', 2, prop, value[prop], next);
}
if (!key) {
if (Array.isArray(value) || typeof value !== 'object') {
return onError(new Error('Cannot merge non-Object into top-level.'), callback);
}
return async.forEach(Object.keys(value), mergeProperty, callback || function () { })
}
return this._execute('merge', 2, key, value, callback);
};
//
// ### function load (callback)
// #### @callback {function} Continuation to respond to when complete.
// Responds with an Object representing all keys associated in this instance.
//
Provider.prototype.load = function (callback) {
var self = this;
function getStores () {
var stores = Object.keys(self.stores);
stores.reverse();
return stores.map(function (name) {
return self.stores[name];
});
}
function loadStoreSync(store) {
if (!store.loadSync) {
throw new Error('nconf store ' + store.type + ' has no loadSync() method');
}
return store.loadSync();
}
function loadStore(store, next) {
if (!store.load && !store.loadSync) {
return next(new Error('nconf store ' + store.type + ' has no load() method'));
}
return store.loadSync
? next(null, store.loadSync())
: store.load(next);
}
function loadBatch (targets, done) {
if (!done) {
return common.merge(targets.map(loadStoreSync));
}
async.map(targets, loadStore, function (err, objs) {
return err ? done(err) : done(null, common.merge(objs));
});
}
function mergeSources (data) {
//
// If `data` was returned then merge it into
// the system store.
//
if (data && typeof data === 'object') {
self.use('sources', {
type: 'literal',
store: data
});
}
}
function loadSources () {
var sourceHierarchy = self.sources.splice(0);
sourceHierarchy.reverse();
//
// If we don't have a callback and the current
// store is capable of loading synchronously
// then do so.
//
if (!callback) {
mergeSources(loadBatch(sourceHierarchy));
return loadBatch(getStores());
}
loadBatch(sourceHierarchy, function (err, data) {
if (err) {
return callback(err);
}
mergeSources(data);
return loadBatch(getStores(), callback);
});
}
return self.sources.length
? loadSources()
: loadBatch(getStores(), callback);
};
//
// ### function save (callback)
// #### @callback {function} **optional** Continuation to respond to when
// complete.
// Instructs each provider to save. If a callback is provided, we will attempt
// asynchronous saves on the providers, falling back to synchronous saves if
// this isn't possible. If a provider does not know how to save, it will be
// ignored. Returns an object consisting of all of the data which was
// actually saved.
//
Provider.prototype.save = function (value, callback) {
if (!callback && typeof value === 'function') {
callback = value;
value = null;
}
var self = this,
names = Object.keys(this.stores);
function saveStoreSync(memo, name) {
var store = self.stores[name];
//
// If the `store` doesn't have a `saveSync` method,
// just ignore it and continue.
//
if (store.saveSync) {
var ret = store.saveSync();
if (typeof ret == 'object' && ret !== null) {
memo.push(ret);
}
}
return memo;
}
function saveStore(memo, name, next) {
var store = self.stores[name];
//
// If the `store` doesn't have a `save` or saveSync`
// method(s), just ignore it and continue.
//
if (store.save) {
return store.save(function (err, data) {
if (err) {
return next(err);
}
if (typeof data == 'object' && data !== null) {
memo.push(data);
}
next(null, memo);
});
}
else if (store.saveSync) {
memo.push(store.saveSync());
}
next(null, memo);
}
//
// If we don't have a callback and the current
// store is capable of saving synchronously
// then do so.
//
if (!callback) {
return common.merge(names.reduce(saveStoreSync, []));
}
async.reduce(names, [], saveStore, function (err, objs) {
return err ? callback(err) : callback(null, common.merge(objs));
});
};
//
// ### @private function _execute (action, syncLength, [arguments])
// #### @action {string} Action to execute on `this.store`.
// #### @syncLength {number} Function length of the sync version.
// #### @arguments {Array} Arguments array to apply to the action
// Executes the specified `action` on all stores for this instance, ensuring a callback supplied
// to a synchronous store function is still invoked.
//
Provider.prototype._execute = function (action, syncLength /* [arguments] */) {
var args = Array.prototype.slice.call(arguments, 2),
callback = typeof args[args.length - 1] === 'function' && args.pop(),
destructive = ['set', 'clear', 'merge', 'reset'].indexOf(action) !== -1,
self = this,
response,
mergeObjs = [];
function runAction (name, next) {
var store = self.stores[name];
if (destructive && store.readOnly) {
return next();
}
return store[action].length > syncLength
? store[action].apply(store, args.concat(next))
: next(null, store[action].apply(store, args));
}
if (callback) {
return async.forEach(Object.keys(this.stores), runAction, function (err) {
return err ? callback(err) : callback();
});
}
Object.keys(this.stores).forEach(function (name) {
if (typeof response === 'undefined') {
var store = self.stores[name];
if (destructive && store.readOnly) {
return;
}
response = store[action].apply(store, args);
// Merge objects if necessary
if (response && action === 'get' && typeof response === 'object' && !Array.isArray(response)) {
mergeObjs.push(response);
response = undefined;
}
}
});
if (mergeObjs.length) {
response = common.merge(mergeObjs.reverse());
}
return response;
}
//
// Throw the `err` if a callback is not supplied
//
function onError(err, callback) {
if (callback) {
return callback(err);
}
throw err;
}