[DEV-5312] Add interface for amqp publisher and implement a delta publisher

package.json.in

@@ -38,7 +38,8 @@
     "mocha":                   "5.2.0",
     "@types/mocha":            "5.2.0",
     "sinon":                   ">=1.17.4",
-    "es6-promise":             "~3"
+    "es6-promise":             "~3",
+    "@types/amqplib":          "0.5.13"
   },
 
   "licenses": [

src/system/AmqpPublisher.ts

@@ -0,0 +1,42 @@
+/**
+ * Amqp Publisher
+ *
+ *  Copyright (C) 2010-2019 R-T Specialty, LLC.
+ *
+ *  This file is part of liza.
+ *
+ *  liza is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Publish Amqp message to a queue
+ */
+
+import { DeltaResult } from "../bucket/delta";
+import { Options } from 'amqplib';
+
+
+export interface AmqpConfig extends Options.Connect {
+    /** The name of a queue or exchange to publish to */
+    exchange: string;
+}
+
+
+export interface AmqpPublisher
+{
+    /**
+     * Publish quote message to exchange post-rating
+     *
+     * @param delta - The delta to publish
+    */
+    publish( delta: DeltaResult<any> ): void;
+}

src/system/DeltaProcessor.ts

@@ -23,6 +23,7 @@ import { DeltaDao } from "../system/db/DeltaDao";
 import { MongoDeltaType } from "../system/db/MongoDeltaDao";
 import { DeltaResult } from "../bucket/delta";
 import { DocumentId } from "../document/Document";
+import { AmqpPublisher } from "./AmqpPublisher";
 
 
 /**
@@ -36,12 +37,6 @@ export class DeltaProcessor
     /** The data delta type */
     readonly DELTA_DATA: MongoDeltaType = 'data';
 
-    /** A mapping of which delta type translated to which avro event */
-    readonly DELTA_MAP: Record<string, string> = {
-        DELTA_RATEDATA: 'rate',
-        DELTA_DATA:     'update',
-    };
-
 
     /**
      * Initialize processor
@@ -49,7 +44,8 @@ export class DeltaProcessor
      * @param _collection Mongo collection
      */
     constructor(
-        private readonly _dao: DeltaDao,
+        private readonly _dao:       DeltaDao,
+        private readonly _publisher: AmqpPublisher,
     ) {}
 
 
@@ -68,9 +64,7 @@ export class DeltaProcessor
 
                 deltas.forEach( delta => {
 
-                    // TODO: publish delta
+                    self._publisher.publish( delta );
-                    // publisher.publish( delta, self.DELTA_MAP[ delta.type ] )
-                    console.log( delta, self.DELTA_MAP[ delta.type ] );
 
                 });
 

src/system/DeltaPublisher.ts

@@ -0,0 +1,133 @@
+/**
+ * Delta Publisher
+ *
+ *  Copyright (C) 2010-2019 R-T Specialty, LLC.
+ *
+ *  This file is part of liza.
+ *
+ *  liza is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Publish delta message to a queue
+ */
+
+import { AmqpPublisher } from "./AmqpPublisher";
+import { DeltaResult } from "../bucket/delta";
+import {
+    connect as amqpConnect,
+    Options,
+    Channel
+} from 'amqplib';
+
+
+export interface AmqpConfig extends Options.Connect {
+    /** The name of a queue or exchange to publish to */
+    exchange: string;
+}
+
+
+export class DeltaPublisher implements AmqpPublisher
+{
+    /** A mapping of which delta type translated to which avro event */
+    readonly DELTA_MAP: Record<string, string> = {
+        data:     'rate',
+        ratedata: 'update',
+    };
+
+
+    /**
+     * Initialize trait
+     *
+     * @param {Object}   conf   AMQP configuration
+     * @param {DebugLog} logger logger instance
+     */
+    constructor(
+        private readonly _conf:   AmqpConfig,
+        private readonly _logger: any
+    ) {}
+
+
+    /**
+     * Publish quote message to exchange post-rating
+     *
+     * @param delta - The delta to publish
+    */
+    publish( delta: DeltaResult<any> ): void
+    {
+        // check both as we transition from one to the other
+        const exchange = this._conf.exchange;
+
+        amqpConnect( this._conf )
+            .then( conn =>
+            {
+                setTimeout( () => conn.close(), 10000 );
+                return conn.createChannel();
+            } )
+            .then( ch => {
+                ch.assertExchange( exchange, 'fanout', { durable: true } );
+
+                return this._sendMessage( ch, exchange, delta );
+            } )
+            .then( () => this._logger.log(
+                this._logger.PRIORITY_INFO,
+                "Published " + delta.type + " delta with timestamp '" +
+                    delta.timestamp + "' to quote-update exchange '"+
+                    exchange + "'"
+            ) )
+            .catch( e => this._logger.log(
+                this._logger.PRIORITY_ERROR,
+                "Error publishing " + delta.type + " delta with timestamp '" +
+                    delta.timestamp + "' to quote-update exchange '"+
+                    exchange + "'" + ": " + e
+            ) );
+    }
+
+
+    /**
+     * Send message to exchange
+     *
+     * @param channel  - AMQP channel
+     * @param exchange - exchange name
+     * @param delta    - The delta to publish
+     *
+     * @return whether publish was successful
+     */
+    _sendMessage(
+        channel:  Channel,
+        exchange: string,
+        delta:    DeltaResult<any>,
+    ): boolean
+    {
+        const headers = {
+            version: 1,
+            created: Date.now(),
+        };
+
+        const event_id = this.DELTA_MAP[ delta.type ];
+
+        const data = new Buffer( JSON.stringify( {
+            delta: delta,
+            event: event_id,
+        } ) );
+
+        // we don't use a routing key; fanout exchange
+        const routing_key = '';
+
+        return channel.publish(
+            exchange,
+            routing_key,
+            data,
+            { headers: headers },
+        );
+    }
+}

test/system/DeltaProcessorTest.ts

@@ -20,6 +20,7 @@
  */
 
 import { DeltaProcessor as Sut } from '../../src/system/DeltaProcessor';
+import { AmqpPublisher } from '../../src/system/AmqpPublisher';
 import { DeltaDao } from '../../src/system/db/DeltaDao';
 import { MongoDeltaType } from '../../src/system/db/MongoDeltaDao';
 
@@ -163,7 +164,11 @@ describe( 'system.DeltaProcessor', () =>
             },
         ] ).forEach( ( { given, expected, label } ) => it( label, () =>
         {
-            const sut = new Sut( createMockDeltaDao() );
+            const sut = new Sut(
+                createMockDeltaDao(),
+                createMockDeltaPublisher()
+            );
+
             const actual = sut.getTimestampSortedDeltas( given );
 
             expect( actual ).to.deep.equal( expected );
@@ -280,7 +285,11 @@ describe( 'system.DeltaProcessor', () =>
             },
         ] ).forEach( ( { type, given, expected, label } ) => it( label, () =>
         {
-            const sut = new Sut( createMockDeltaDao() );
+            const sut = new Sut(
+                createMockDeltaDao(),
+                createMockDeltaPublisher()
+            );
+
             const actual = sut.getDeltas( given, type );
 
             expect( actual ).to.deep.equal( expected );
@@ -297,3 +306,11 @@ function createMockDeltaDao(): DeltaDao
         markDocumentAsProcessed() { return this },
     };
 }
+
+
+function createMockDeltaPublisher(): AmqpPublisher
+{
+    return <AmqpPublisher>{
+        publish() {},
+    };
+}

test/system/DeltaPublisherTest.ts

@@ -0,0 +1,49 @@
+/**
+ * Delta publisher test
+ *
+ *  Copyright (C) 2010-2019 R-T Specialty, LLC.
+ *
+ *  This file is part of the Liza Data Collection Framework.
+ *
+ *  liza is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as
+ *  published by the Free Software Foundation, either version 3 of the
+ *  License, or (at your option) any later version.
+ *
+ *  This program 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import {
+    DeltaPublisher as Sut,
+    AmqpConfig
+} from "../../src/system/DeltaPublisher";
+
+import { expect, use as chai_use } from 'chai';
+chai_use( require( 'chai-as-promised' ) );
+
+
+describe( 'server.DeltaPublisher', () =>
+{
+    describe( '#publish', () =>
+    {
+        it( 'sends a message', () =>
+        {
+            const conf = createMockConf();
+
+            console.log( new Sut( conf, {} ) );
+            expect( true ).to.be.true
+        });
+    });
+} );
+
+
+function createMockConf(): AmqpConfig
+{
+    return <AmqpConfig>{};
+}