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Commit 3c674171 authored by Tristan Cavelier's avatar Tristan Cavelier
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replicatestorage.js prototype created for JIO v2

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src/jio.storage/replicatestorage.js
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/*jslint indent: 2, maxlen: 80, sloppy: true, nomen: true */ /*
/*global jIO: true */ * JIO extension for resource replication.
jIO.addStorageType('replicate', function (spec, my) { * Copyright (C) 2013 Nexedi SA
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
var that, cloned_option, priv = {}, /*jslint indent: 2, maxlen: 80, nomen: true */
super_serialized = that.serialized; /*global define, module, require, jIO, RSVP */
spec = spec || {}; (function (root, dependencies, factory) {
that = my.basicStorage(spec, my); "use strict";
if (typeof define === 'function' && define.amd) {
return define(dependencies, function () {
return factory(require);
});
}
if (typeof require === 'function') {
module.exports = factory(require);
return;
}
root.replicate_storage = factory(function (name) {
return {
"jio": jIO,
"rsvp": RSVP
}[name];
});
}(this, ['jio', 'rsvp'], function (require) {
"use strict";
priv.return_value_array = []; var Promise = require('rsvp').Promise,
priv.storagelist = spec.storagelist || []; all = require('rsvp').all,
priv.nb_storage = priv.storagelist.length; addStorageFunction = require('jio').addStorage;
that.serialized = function () { /**
var o = super_serialized(); * Test if the a value is a date
o.storagelist = priv.storagelist; *
return o; * @param {String,Number,Date} date The date to test
* @return {Boolean} true if success, else false
*/
function isDate(date) {
if (!isNaN((new Date(date === null ? undefined : date)).getTime())) {
return true;
}
return false;
}
/**
* Executes a sequence of *then* callbacks. It acts like
* `smth().then(callback).then(callback)...`. The first callback is called
* with no parameter.
*
* Elements of `then_list` array can be a function or an array contaning at
* most three *then* callbacks: *onFulfilled*, *onRejected*, *onNotified*.
*
* When `cancel()` is executed, each then promises are cancelled at the same
* time.
*
* sequence(then_list): Promise
*
* @param {Array} then_list An array of *then* callbacks
* @return {Promise} A new promise
*/
function sequence(then_list) {
var promise_list = [];
return new Promise(function (resolve, reject, notify) {
var i, length = then_list.length;
promise_list[0] = new Promise(function (resolve) {
resolve();
});
for (i = 0; i < length; i += 1) {
if (Array.isArray(then_list[i])) {
promise_list[i + 1] = promise_list[i].
then(then_list[i][0], then_list[i][1], then_list[i][2]);
} else {
promise_list[i + 1] = promise_list[i].then(then_list[i]);
}
}
promise_list[i].then(resolve, reject, notify);
}, function () {
var i, length = promise_list.length;
for (i = 0; i < length; i += 1) {
promise_list[i].cancel();
}
});
}
function success(promise) {
return new Promise(function (resolve, reject, notify) {
/*jslint unparam: true*/
promise.then(resolve, resolve, notify);
}, function () {
promise.cancel();
});
}
/**
* Awaits for an answer from one promise only. Promises are cancelled only
* by calling `first(promise_list).cancel()`.
*
* first(promise_list): Promise
*
* @param {Array} promise_list An array of promises
* @return {Promise} A new promise
*/
function first(promise_list) {
var length = promise_list.length;
promise_list = promise_list.slice();
return new Promise(function (resolve, reject, notify) {
var index, count = 0;
function rejecter(answer) {
count += 1;
if (count === length) {
return reject(answer);
}
}
function notifier(index) {
return function (notification) {
notify({
"index": index,
"value": notification
});
};
}
for (index = 0; index < length; index += 1) {
promise_list[index].then(resolve, rejecter, notifier(index));
}
}, function () {
var index;
for (index = 0; index < length; index += 1) {
promise_list[index].cancel();
}
});
}
/**
* Responds with the last resolved promise answer recieved. If all promises
* are rejected, it returns the latest rejected promise answer
* received. Promises are cancelled only by calling
* `last(promise_list).cancel()`.
*
* last(promise_list): Promise
*
* @param {Array} promise_list An array of promises
* @return {Promise} A new promise
*/
function last(promise_list) {
var length = promise_list.length;
promise_list = promise_list.slice();
return new Promise(function (resolve, reject, notify) {
var index, last_answer, count = 0, error_count = 0;
function resolver() {
return function (answer) {
count += 1;
if (count === length) {
return resolve(answer);
}
last_answer = answer;
};
}
function rejecter() {
return function (answer) {
error_count += 1;
if (error_count === length) {
return reject(answer);
}
count += 1;
if (count === length) {
return resolve(last_answer);
}
};
}
function notifier(index) {
return function (notification) {
notify({
"index": index,
"value": notification
});
};
}
for (index = 0; index < length; index += 1) {
promise_list[index].then(resolver(), rejecter(), notifier(index));
}
}, function () {
var index;
for (index = 0; index < length; index += 1) {
promise_list[index].cancel();
}
});
}
/**
* Responds with the last modified document recieved. If all promises are
* rejected, it returns the latest rejected promise answer received. Promises
* are cancelled only by calling `lastModified(promise_list).cancel()`. USE
* THIS FUNCTION ONLY FOR GET METHOD!
*
* lastModified(promise_list): Promise
*
* @param {Array} promise_list An array of promises
* @return {Promise} A new promise
*/
function lastModified(promise_list) {
var length = promise_list.length;
promise_list = promise_list.slice();
return new Promise(function (resolve, reject, notify) {
var index, last_good_answer, last_answer, count = 0, error_count = 0;
function resolver(answer) {
last_answer = answer;
if (last_good_answer === undefined) {
if (isDate(answer.data.modified)) {
last_good_answer = answer;
}
} else {
if (isDate(answer.data.modified)) {
if (new Date(last_good_answer.data.modified) <
new Date(answer.data.modified)) {
last_good_answer = answer;
}
}
}
count += 1;
if (count === length) {
return resolve(last_good_answer);
}
}
function rejecter(answer) {
error_count += 1;
if (error_count === length) {
return reject(answer);
}
count += 1;
if (count === length) {
return resolve(last_good_answer || last_answer);
}
}
function notifier(index) {
return function (notification) {
notify({
"index": index,
"value": notification
});
};
}
for (index = 0; index < length; index += 1) {
promise_list[index].then(resolver, rejecter, notifier(index));
}
}, function () {
var index;
for (index = 0; index < length; index += 1) {
promise_list[index].cancel();
}
});
}
// /**
// * An Universal Unique ID generator
// *
// * @return {String} The new UUID.
// */
// function generateUuid() {
// function S4() {
// return ('0000' + Math.floor(
// Math.random() * 0x10000 /* 65536 */
// ).toString(16)).slice(-4);
// }
// return S4() + S4() + "-" +
// S4() + "-" +
// S4() + "-" +
// S4() + "-" +
// S4() + S4() + S4();
// }
function ReplicateStorage(spec) {
if (!Array.isArray(spec.storage_list)) {
throw new TypeError("ReplicateStorage(): " +
"storage_list is not of type array");
}
this._storage_list = spec.storage_list;
}
ReplicateStorage.prototype.post = function (command, metadata, option) {
var promise_list = [], index, length = this._storage_list.length;
if (!isDate(metadata.modified)) {
command.error(
409,
"invalid 'modified' metadata",
"The metadata 'modified' should be a valid date string or date object"
);
return;
}
for (index = 0; index < length; index += 1) {
promise_list[index] = success(
command.storage(this._storage_list[index]).post(metadata, option)
);
}
sequence([function () {
return first(promise_list);
}, [command.success, command.error]]);
}; };
that.validateState = function () { ReplicateStorage.prototype.put = function (command, metadata, option) {
if (priv.storagelist.length === 0) { var promise_list = [], index, length = this._storage_list.length;
return 'Need at least one parameter: "storagelist" ' + if (!isDate(metadata.modified)) {
'containing at least one storage.'; command.error(
409,
"invalid 'modified' metadata",
"The metadata 'modified' should be a valid date string or date object"
);
return;
} }
return ''; for (index = 0; index < length; index += 1) {
promise_list[index] =
command.storage(this._storage_list[index]).put(metadata, option);
}
sequence([function () {
return first(promise_list);
}, [command.success, command.error]]);
}; };
priv.isTheLast = function (error_array) { ReplicateStorage.prototype.putAttachment = function (command, param, option) {
return (error_array.length === priv.nb_storage); var promise_list = [], index, length = this._storage_list.length;
for (index = 0; index < length; index += 1) {
promise_list[index] = success(
command.storage(this._storage_list[index]).putAttachment(param, option)
);
}
sequence([function () {
return last(promise_list);
}, [command.success, command.error]]);
}; };
priv.doJob = function (command, errormessage, nodocid) { ReplicateStorage.prototype.remove = function (command, param, option) {
var done = false, var promise_list = [], index, length = this._storage_list.length;
error_array = [], for (index = 0; index < length; index += 1) {
i, promise_list[index] = success(
error = function (err) { command.storage(this._storage_list[index]).remove(param, option)
if (!done) { );
error_array.push(err);
if (priv.isTheLast(error_array)) {
that.error({
status: 207,
statusText: 'Multi-Status',
error: 'multi_status',
message: 'All ' + errormessage + (!nodocid ? ' "' +
command.getDocId() + '"' : ' ') + ' requests have failed.',
reason: 'requests fail',
array: error_array
});
}
}
},
success = function (val) {
if (!done) {
done = true;
that.success(val);
}
};
for (i = 0; i < priv.nb_storage; i += 1) {
cloned_option = command.cloneOption();
that.addJob(command.getLabel(), priv.storagelist[i],
command.cloneDoc(), cloned_option, success, error);
} }
sequence([function () {
return first(promise_list);
}, [command.success, command.error]]);
}; };
that.post = function (command) { ReplicateStorage.prototype.removeAttachment = function (
priv.doJob(command, 'post'); command,
that.end(); param,
option
) {
var promise_list = [], index, length = this._storage_list.length;
for (index = 0; index < length; index += 1) {
promise_list[index] = success(
command.storage(this._storage_list[index]).
removeAttachment(param, option)
);
}
sequence([function () {
return last(promise_list);
}, [command.success, command.error]]);
}; };
/** ReplicateStorage.prototype.get = function (command, param, option) {
* Save a document in several storages. var promise_list = [], index, length = this._storage_list.length;
* @method put for (index = 0; index < length; index += 1) {
*/ promise_list[index] =
that.put = function (command) { command.storage(this._storage_list[index]).get(param, option);
priv.doJob(command, 'put'); }
that.end(); sequence([function () {
return lastModified(promise_list);
}, [command.success, command.error]]);
}; };
/** ReplicateStorage.prototype.getAttachment = function (command, param, option) {
* Load a document from several storages, and send the first retreived var promise_list = [], index, length = this._storage_list.length;
* document. for (index = 0; index < length; index += 1) {
* @method get promise_list[index] = success(
*/ command.storage(this._storage_list[index]).getAttachment(param, option)
that.get = function (command) { );
priv.doJob(command, 'get'); }
that.end(); sequence([function () {
return last(promise_list);
}, [command.success, command.error]]);
}; };
/** ReplicateStorage.prototype.allDocs = function (command, param, option) {
* Get a document list from several storages, and returns the first var promise_list = [], index, length = this._storage_list.length;
* retreived document list. for (index = 0; index < length; index += 1) {
* @method allDocs promise_list[index] =
*/ command.storage(this._storage_list[index]).allDocs(param, option);
that.allDocs = function (command) { }
priv.doJob(command, 'allDocs', true); sequence([function () {
that.end(); return last(promise_list);
}, [command.success, command.error]]);
}; };
/** ReplicateStorage.prototype.check = function (command, param, option) {
* Remove a document from several storages. var promise_list = [], index, length = this._storage_list.length;
* @method remove for (index = 0; index < length; index += 1) {
*/ promise_list[index] = success(
that.remove = function (command) { command.storage(this._storage_list[index]).check(param, option)
priv.doJob(command, 'remove'); );
that.end(); }
sequence([function () {
return all(promise_list);
}, [command.success, command.error]]);
}; };
return that; ReplicateStorage.prototype.repair = function (command, param) {
}); var promise_list = [], index, that, length = this._storage_list.length;
that = this;
if (typeof param._id !== 'string' || !param._id) {
command.success();
return;
}
for (index = 0; index < length; index += 1) {
promise_list[index] =
success(command.storage(this._storage_list[index]).get(param));
}
sequence([function () {
return all(promise_list);
}, function (answers) {
var i, list = [], winner = null;
for (i = 0; i < answers.length; i += 1) {
console.log(i, answers[i].result, answers[i].data || answers[i].status);
if (answers[i].result === "success") {
if (isDate(answers[i].data.modified)) {
list[i] = answers.data;
if (winner === null ||
new Date(winner.modified) <
new Date(answers[i].data.modified)) {
winner = answers[i].data;
}
}
} else if (answers[i].status === 404) {
list[i] = 0;
}
}
for (i = 0; i < list.length; i += 1) {
if (list[i] && new Date(list[i].modified) < new Date(winner.modified)) {
console.log('put', i, winner);
list[i] = success(command.storage(that._storage_list[i]).put(winner));
} else if (list[i] === 0) {
console.log('post', i, winner);
list[i] = jIO.util.dictUpdate({}, winner);
delete list[i]._id;
list[i] =
success(command.storage(that._storage_list[i]).post(list[i]));
}
}
list = list.reduce(function (previous, current) {
if (current) {
previous.push(current);
}
return previous;
}, []);
return all(list);
}, function (answers) {
var i;
for (i = 0; i < answers.length; i += 1) {
if (answers[i].result !== "success") {
return command.error(409);
}
}
command.success();
}]);
};
addStorageFunction('replicate', ReplicateStorage);
}));
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