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* VisualEditor document store class.
*
* @copyright See AUTHORS.txt
*/
'use strict';
/**
* @constructor
* @param {Object} storageClient MongoClient-like object; passed as a parameter for testing purposes
* @param {string} dbName Database name
* @param {Object} logger Logger class
* @param {Function} logger.logServerEvent Stringify object argument to log, adding timestamp and server ID properties
*/
ve.dm.DocumentStore = function VeDmDocumentStore( storageClient, dbName, logger ) {
this.storageClient = storageClient;
this.dbName = dbName;
this.logger = logger;
this.db = null;
this.collection = null;
this.startForDoc = new Map();
this.serverId = null;
};
/**
* @return {Promise} Resolves when connected
*/
ve.dm.DocumentStore.prototype.connect = function () {
const documentStore = this;
return this.storageClient.connect().then( ( client ) => {
const db = client.db( documentStore.dbName );
documentStore.logger.logServerEvent( { type: 'DocumentStore#connected', dbName: documentStore.dbName }, 'info' );
documentStore.db = db;
documentStore.collection = db.collection( 'vedocstore' );
return documentStore.collection.findOneAndUpdate(
{ config: 'options' },
{ $setOnInsert: { serverId: Math.random().toString( 36 ).slice( 2 ) } },
{ upsert: true, returnDocument: 'after' }
);
} ).then( ( result ) => {
documentStore.serverId = result.value.serverId;
} );
};
/**
* @return {Promise} Drops the entire database
*/
ve.dm.DocumentStore.prototype.dropDatabase = function () {
this.logger.logServerEvent( { type: 'DocumentStore#dropDatabase', dbName: this.dbName }, 'info' );
return this.db.dropDatabase();
};
/**
* Load a document from storage (creating as empty if absent)
*
* @param {string} docName Name of the document
* @return {Promise} Confirmed document history as a ve.dm.Change
*/
ve.dm.DocumentStore.prototype.load = function ( docName ) {
const documentStore = this;
return this.collection.findOneAndUpdate(
{ docName: docName },
{ $setOnInsert: { start: 0, transactions: [], stores: [] } },
{ upsert: true, returnDocument: 'after' }
).then( ( result ) => {
const length = result.value.transactions.length || 0;
documentStore.logger.logServerEvent( { type: 'DocumentStore#loaded', docName: docName, length: length } );
documentStore.startForDoc.set( docName, result.value.start + length );
return ve.dm.Change.static.deserialize( {
start: 0,
transactions: result.value.transactions,
stores: result.value.stores,
selections: {}
}, true );
} );
};
/**
* Save a new change to storage
*
* @param {string} docName Name of the document
* @param {ve.dm.Change} change The new change
* @return {Promise} Resolves when saved
*/
ve.dm.DocumentStore.prototype.onNewChange = function ( docName, change ) {
const serializedChange = change.serialize( true ),
expectedStart = this.startForDoc.get( docName ) || 0;
if ( expectedStart !== serializedChange.start ) {
return Promise.reject( 'Unmatched starts:', expectedStart, serializedChange.start );
}
this.startForDoc.set( docName, serializedChange.start + serializedChange.transactions.length );
return this.collection.updateOne(
{ docName: docName },
{
$push: {
transactions: { $each: serializedChange.transactions },
stores: { $each: serializedChange.stores || serializedChange.transactions.map( () => null ) }
}
}
).then( () => {
this.logger.logServerEvent( {
type: 'DocumentStore#onNewChange',
docName: docName,
start: serializedChange.start,
length: serializedChange.transactions.length
} );
} );
};
ve.dm.DocumentStore.prototype.onClose = function () {
this.logger.logServerEvent( { type: 'DocumentStore#onClose' }, 'info' );
this.storageClient.close();
};
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