301 lines
8.0 KiB
TypeScript
301 lines
8.0 KiB
TypeScript
/**
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* Delta Publisher
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*
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* Copyright (C) 2010-2019 R-T Specialty, LLC.
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*
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* This file is part of liza.
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*
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* liza is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* Publish delta message to a queue
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*/
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import { AmqpPublisher } from './AmqpPublisher';
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import { DeltaResult } from '../bucket/delta';
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import { EventDispatcher } from './event/EventDispatcher';
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import {
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connect as amqpConnect,
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Options,
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Channel
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} from 'amqplib';
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const avro = require( 'avro-js' );
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export interface AmqpConfig extends Options.Connect {
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/** The name of a queue or exchange to publish to */
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exchange: string;
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}
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export class DeltaPublisher implements AmqpPublisher
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{
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/** The path to the avro schema */
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readonly SCHEMA_PATH = __dirname + '/avro/schema.avsc';
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/** A mapping of which delta type translated to which avro event */
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readonly DELTA_MAP: Record<string, string> = {
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data: 'STEP_SAVE',
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ratedata: 'RATE',
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};
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/**
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* Initialize publisher
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*
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* @param _conf - amqp configuration
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* @param _emitter - event emitter instance
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* @param _ts_ctr - a timestamp constructor
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*/
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constructor(
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private readonly _conf: AmqpConfig,
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private readonly _dispatcher: EventDispatcher,
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private readonly _ts_ctr : () => UnixTimestamp,
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) {}
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/**
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* Publish quote message to exchange post-rating
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*
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* @param delta - The delta to publish
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*
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* @return whether the message was published successfully
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*/
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publish( delta: DeltaResult<any> ): Promise<null>
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{
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const exchange = this._conf.exchange;
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return new Promise<null>( ( resolve, reject ) =>
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{
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amqpConnect( this._conf )
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.then( conn =>
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{
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setTimeout( () => conn.close(), 10000 );
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return conn.createChannel();
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} )
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.then( ch =>
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{
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ch.assertExchange( exchange, 'fanout', { durable: true } );
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return this.sendMessage( ch, exchange, delta );
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} )
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.then( sentSuccessfully =>
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{
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console.log('sentSuccessfully', sentSuccessfully);
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if ( sentSuccessfully )
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{
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this._dispatcher.dispatch(
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'delta-publish',
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"Published " + delta.type + " delta with ts '"
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+ delta.timestamp + "' to '" + exchange
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+ '" exchange',
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);
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resolve();
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}
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else
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{
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this._dispatcher.dispatch(
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'publish-err',
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"Error publishing " + delta.type + " delta with ts '"
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+ delta.timestamp + "' to '" + exchange
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+ "' exchange",
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);
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reject();
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}
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} )
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.catch( e =>
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{
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this._dispatcher.dispatch(
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'publish-err',
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"Error publishing " + delta.type + " delta with ts '"
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+ delta.timestamp + '" to "' + exchange + "' exchange '"
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+ e,
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)
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reject();
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} );
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} );
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}
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/**
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* Send message to exchange
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*
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* @param channel - AMQP channel
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* @param exchange - exchange name
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* @param delta - The delta to publish
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*
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* @return whether publish was successful
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*/
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sendMessage(
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channel: Channel,
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exchange: string,
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delta: DeltaResult<any>,
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): boolean
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{
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const headers = {
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version: 1,
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created: Date.now(),
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};
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// Convert all delta datums to string for avro
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const delta_data = this.avroFormat( delta.data );
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const event_id = this.DELTA_MAP[ delta.type ];
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const data = {
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event: {
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id: event_id,
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ts: this._ts_ctr(),
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actor: 'SERVER',
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step: null,
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},
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document: {
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id: 123123, // Fix
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},
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session: {
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entity_name: 'Foobar', // Fix
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entity_id: 123123, // Fix
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},
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data: {
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Data: {
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bucket: delta_data,
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},
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},
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delta: {
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Data: {
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bucket: delta_data,
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},
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},
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program: {
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Program: {
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id: 'quote_server',
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version: 'dadaddwafdwa', // Fix
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},
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},
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};
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const avro_buffer = this.avroEncode( data );
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if ( !avro_buffer )
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{
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return false;
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}
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// we don't use a routing key; fanout exchange
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const routing_key = '';
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return channel.publish(
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exchange,
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routing_key,
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avro_buffer,
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{ headers: headers },
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);
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}
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/**
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* Encode the data in an avro buffer
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*
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* @param data - the data to encode
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*
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* @return the avro buffer or null if there is an error
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*/
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avroEncode( data: Record<string, any> ): Buffer | null
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{
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let buffer = null;
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try
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{
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const type = avro.parse( this.SCHEMA_PATH );
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buffer = type.toBuffer( data );
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}
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catch( e )
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{
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this._dispatcher.dispatch(
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'avro-parse-err',
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'Error encoding data to avro: ' + e,
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);
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}
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return buffer;
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}
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/**
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* Format the data for avro by add type specifications to the data
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*
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* @param data - the data to format
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*
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* @return the formatted data
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*/
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avroFormat( data: any, top_level: boolean = true ): any
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{
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let data_formatted: any = {};
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switch( typeof( data ) )
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{
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case 'object': // Typescript treats arrays as objects
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if ( data == null )
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{
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return null;
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}
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else if ( Array.isArray( data ) )
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{
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let arr: any[] = [];
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data.forEach( ( datum ) =>
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{
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arr.push( this.avroFormat( datum, false ) );
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} );
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data_formatted = ( top_level )
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? arr
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: { 'array': arr };
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}
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else
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{
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let datum_formatted: any = {};
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Object.keys( data).forEach( ( key: string ) =>
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{
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const datum = this.avroFormat( data[ key ], false );
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datum_formatted[ key ] = datum;
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} );
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data_formatted = ( top_level )
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? datum_formatted
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: { "map": datum_formatted };
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}
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break;
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case 'boolean':
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return { 'boolean': data };
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case 'number':
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return { 'double': data };
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case 'string':
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return { 'string': data };
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case 'undefined':
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return null;
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}
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return data_formatted;
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}
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}
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