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* VisualEditor DataModel protocol server class.
*
* @copyright See AUTHORS.txt
*/
'use strict';
/**
* Protocol server
*
* Handles the abstract protocol without knowing the specific transport
*
* @param {ve.dm.DocumentStore} documentStore The persistent storage
* @param {Object} logger Logger class
* @param {Function} logger.getRelativeTimestmap Return the number of ms since the logger started
* @param {Function} logger.logEvent Stringify object argument to log
* @param {Function} logger.logServerEvent Stringify object argument to log, adding timestamp and server ID properties
*/
ve.dm.ProtocolServer = function VeDmProtocolServer( documentStore, logger ) {
this.logger = logger;
this.rebaseServer = new ve.dm.RebaseServer();
this.lastAuthorForDoc = new Map();
this.loadingForDoc = new Map();
this.documentStore = documentStore;
this.logger.logServerEvent( { type: 'restart' }, 'info' );
};
OO.initClass( ve.dm.ProtocolServer );
ve.dm.ProtocolServer.static.palette = [
'1f77b4', 'ff7f0e', '2ca02c', 'd62728', '9467bd',
'8c564b', 'e377c2', '7f7f7f', 'bcbd22', '17becf',
'aec7e8', 'ffbb78', '98df8a', 'ff9896', 'c5b0d5',
'c49c94', 'f7b6d2', 'c7c7c7', 'dbdb8d', '9edae5'
];
/**
* If the document is not loaded, load from storage (creating as empty if absent)
*
* @param {string} docName Name of the document
* @return {Promise} Resolves when loaded
*/
ve.dm.ProtocolServer.prototype.ensureLoaded = function ( docName ) {
const rebaseServer = this.rebaseServer;
let loading = this.loadingForDoc.get( docName );
if ( loading ) {
return loading;
}
this.logger.logServerEvent( { type: 'ProtocolServer#load', docName: docName } );
loading = this.documentStore.load( docName ).then( ( change ) => {
this.logger.logServerEvent( {
type: 'ProtocolServer#loaded',
docName: docName,
length: change.getLength()
} );
rebaseServer.updateDocState( docName, null, change );
} );
this.loadingForDoc.set( docName, loading );
return loading;
};
/**
* Check the client's credentials, and return a connection context object
*
* If the client is not recognised and authenticated, a new client ID and token are assigned.
*
* @param {string} docName The document name
* @param {number|null} authorId The author ID, if any
* @param {number|null} token The secret token, if any
*
* @return {Object} The connection context
*/
ve.dm.ProtocolServer.prototype.authenticate = function ( docName, authorId, token ) {
const state = this.rebaseServer.stateForDoc.get( docName ),
authorData = state && state.authors.get( authorId );
if ( !authorData || token !== authorData.token ) {
authorId = 1 + ( this.lastAuthorForDoc.get( docName ) || 0 );
this.lastAuthorForDoc.set( docName, authorId );
token = Math.random().toString( 36 ).slice( 2 );
}
const context = {
serverId: this.documentStore.serverId,
docName: docName,
authorId: authorId
};
this.logger.logServerEvent( {
type: 'newClient',
doc: docName,
authorId: context.authorId
} );
return context;
};
/**
* Add an event to the log
*
* @param {Object} context The connection context
* @param {Object} event Event data
*/
ve.dm.ProtocolServer.prototype.onLogEvent = function ( context, event ) {
const ob = {};
ob.recvTimestamp = this.logger.getRelativeTimestamp();
ob.clientId = context.authorId;
ob.doc = context.docName;
for ( const key in event ) {
ob[ key ] = event[ key ];
}
this.logger.logEvent( ob );
};
/**
* Setup author on the server and send initialization events
*
* @param {Object} context The connection context
* @param {number} [startLength=0] The length of the common history
* @param {Function} [usernameGenerator] Function which returns a username, with an authorID argument
*/
ve.dm.ProtocolServer.prototype.welcomeClient = function ( context, startLength, usernameGenerator ) {
const docName = context.docName,
serverId = context.serverId,
authorId = context.authorId;
if ( !startLength ) {
startLength = 0;
}
this.rebaseServer.updateDocState( docName, authorId, null, {
name: usernameGenerator ? usernameGenerator( authorId ) : 'User ' + authorId,
color: this.constructor.static.palette[
authorId % this.constructor.static.palette.length
],
active: true
} );
const state = this.rebaseServer.getDocState( docName );
const authorData = state.authors.get( authorId );
context.sendAuthor( 'registered', {
serverId: serverId,
authorId: authorId,
token: authorData.token
} );
context.broadcast( 'authorChange', {
authorId: authorId,
authorData: {
name: authorData.name,
color: authorData.color
}
} );
// HACK Catch the client up on the current state by sending it the entire history
// Ideally we'd be able to initialize the client using HTML, but that's hard, see
// comments in the /raw handler. Keeping an updated linmod on the server could be
// feasible if TransactionProcessor was modified to have a "don't sync, just apply"
// mode and ve.dm.Document was faked with { data: …, metadata: …, store: … }
context.sendAuthor( 'initDoc', {
history: state.history.mostRecent( startLength ).serialize( true ),
authors: state.getActiveAuthors()
} );
};
/**
* Try to apply a received change, and broadcast the successful portion as rebased
*
* @param {Object} context The connection context
* @param {Object} data The change data
*/
ve.dm.ProtocolServer.prototype.onSubmitChange = function ( context, data ) {
const change = ve.dm.Change.static.deserialize( data.change, true );
const applied = this.rebaseServer.applyChange( context.docName, context.authorId, data.backtrack, change );
if ( !applied.isEmpty() ) {
this.documentStore.onNewChange( context.docName, applied );
context.broadcast( 'newChange', applied.serialize( true ) );
}
};
/**
* Apply and broadcast an author change
*
* @param {Object} context The connection context
* @param {string} newData The new author data
*/
ve.dm.ProtocolServer.prototype.onChangeAuthor = function ( context, newData ) {
this.rebaseServer.updateDocState( context.docName, context.authorId, null, {
name: newData.name,
color: newData.color
} );
context.broadcast( 'authorChange', {
authorId: context.authorId,
authorData: {
name: newData.name,
color: newData.color
}
} );
this.logger.logServerEvent( {
type: 'authorChange',
doc: context.docName,
authorId: context.authorId,
authorData: {
name: newData.name,
color: newData.color
}
} );
};
/**
* Apply and broadcast a disconnection (which may be temporary)
*
* @param {Object} context The connection context
*/
ve.dm.ProtocolServer.prototype.onDisconnect = function ( context ) {
this.rebaseServer.updateDocState( context.docName, context.authorId, null, {
active: false,
continueBase: null,
rejections: null
} );
context.broadcast( 'authorDisconnect', context.authorId );
this.logger.logServerEvent( {
type: 'disconnect',
doc: context.docName,
authorId: context.authorId
} );
};
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