import { map, Observable, of, Subject } from "rxjs"; import { BaseMessage } from "../dependencies/fisappmessagejsutilty/dependencies/dependencies"; import { LoggingService } from "../dependencies/log/services/logging-service"; import { LogSetting, MessageLog } from "../dependencies/log/type/datatype"; import { ErrorTrigger, MessageAuditorServiceInterface, MessageSynchronisationServiceSetting } from "../type/datatype"; export class MessageAuditorService implements MessageAuditorServiceInterface { private settings: MessageSynchronisationServiceSetting private sourceSrc: LoggingService = new LoggingService() private targetSrc: LoggingService = new LoggingService() /* Set up the targets or points of synchronization. This is where it will register the 2 different location of the data to be synchronized */ public init(settings: MessageSynchronisationServiceSetting): void { this.settings = settings; } /* This is the main interface of the message sync service. The argument will take in an observable stream of error notifications, prompting it to perform the subscription of the targeted sources and it's corresponding target. Essentially, this does not in synchronize, but rather it checks against the two sources and compare and return the missing data, which will then be passed into the targeted subject stream as specified by the respective client. They can choose how they want to handle the missing messages returned. */ public subscribe(obsTrigger: Observable): Observable { // Create a subject as a means to return the missing messages if there's any. let msg: Subject = new Subject() // Subsribe to the errorTrigger obs to listen to any notification. obsTrigger.subscribe({ next: obsTrigger => { console.log(obsTrigger.message)// just checking the message let missingMsg = this.dataConversion() missingMsg.subscribe({ next: element => { msg.next(element) } }) } }) // Not sure why this piece of code is here. It generally doesn't affect the function // if (!obsTrigger) { // this.dataConversion() // } let result: Observable = msg.asObservable() return result } // Need to change the data to json format first private dataConversion(): Observable { // let subjectOutput = this.syncrhonize() let obsOutput: Observable = this.synchronize().pipe( map((msg: MessageLog) => { console.log(`Converting this ${msg.appData.msgId}`) return JSON.parse(msg.appData.msgPayload) }) ) return obsOutput } /* This is where the 'synching' operation takes place. */ private synchronize(): Subject { let subjectOutput = new Subject() // Acquire the data from both location and return them as an array respectively. this.acquireData().then((data: { arr1: MessageLog[], arr2: MessageLog[] }) => { // Check for length first. If the length matches, then there's no need to sync // since there's nothing missing. if (data.arr1.length === data.arr2.length) { console.log(`No synchronization needed`) } else { // In the case where there are differences in the array lengthh, then extensive comparison // will be carried to filter out the differences. Differences are the missing data. this.checkArrayDifferences(data).then((data: MessageLog[]) => { data.forEach(msgElement => { // Once the missing data has been weeded out, it is then passed into the Subject // to be returned for the subscribe method. subjectOutput.next(msgElement) }) }) } }).catch((e) => console.error(e)) return subjectOutput } /* This is where the targeted data is queried. The process is pretty straightforward. */ private async acquireData(): Promise { const promiseQuery: Promise = new Promise((resolve, reject) => { // declare what to expect. let allSets: { arr1: MessageLog[], arr2: MessageLog[] } = { arr1: [], arr2: [] } let set1 let set2 // Initiate the source to find the location of the targeted data to be synched. this.sourceSrc.init(this.settings.incomingSource).then(() => { this.targetSrc.init(this.settings.target).then(() => { // Filter also carries out the query aspect of the operation, allowing it to acquire all the relevant data. this.sourceSrc.filter({ msgTag: this.settings.incomingSource.tags[0] }).then((data: MessageLog[]) => { set1 = data }).then(() => { this.targetSrc.filter({ msgTag: this.settings.target.tags[0] }).then((data: MessageLog[]) => { set2 = data allSets.arr1 = set1 allSets.arr2 = set2 resolve(allSets) }) }) }) }) }) return promiseQuery } // compare results and return differences private async checkArrayDifferences(args: { arr1?: any[], arr2?: any[] }): Promise { return new Promise((resolve, reject) => { let missingMsg: MessageLog[] = [] args.arr1.forEach((msgElement: MessageLog) => { // In this case, we are just checking if the msgId matches within the given the array. // Just to save time, there's no need to check the entire message structure unless // the circumstances necessitates it. if (args.arr2.some(obj => obj.appData.msgId === msgElement.appData.msgId)) { console.log(`Item Found!`) } else { console.log(`This ${msgElement.appData.msgId} is not found`) missingMsg.push(msgElement) resolve(missingMsg) } }) }) } }