Add new backend support

[Ryangr0]

📝 Description

As discussed in #12, following the documentation does not lead to a working instance of this plugin, when you use the latest version of Backstage. I've created this PR as a draft to hopefully start collaboration on working on a solution for this. I will document below a small list of steps I've done to get Backstage to load the plugin.

1. Place the plugins/library-check-backend directory into your Backstage's plugins/library-check-backend
2. Place the following in your Backstage's packages/backend/src/index.ts

import {catalogProcessingExtensionPoint} from "@backstage/plugin-catalog-node/alpha";
import {loggerToWinstonLogger} from '@backstage/backend-common';
import {LibraryCheckProcessor, LibraryCheckUpdaterProcessor} from "../../../plugins/library-check-backend";

const libraryCheckModule = createBackendModule({
    pluginId: 'catalog',
    moduleId: 'library-check',
    register(env) {
        env.registerInit({
            deps: {
                catalog: catalogProcessingExtensionPoint,
                logger: coreServices.logger,
                scheduler: coreServices.scheduler,
                reader: coreServices.urlReader,
                discovery: coreServices.discovery,
                config: coreServices.rootConfig,
            },
            async init({ catalog, logger, scheduler, reader, discovery, config}) {

                const defaultSchedule = {
                    initialDelay: { seconds: 15 },
                    frequency: { minutes: 10 },
                    timeout: { minutes: 15 },
                };
                scheduler.createScheduledTaskRunner(defaultSchedule);

                const winstonLogger = loggerToWinstonLogger(logger);
                
                catalog.addProcessor(
                  LibraryCheckProcessor.fromConfig(
                    config,
                    {
                        reader: reader,
                        discoveryService: discovery,
                        logger: winstonLogger
                    }
                  )
                );
                catalog.addProcessor(
                  LibraryCheckUpdaterProcessor.fromConfig(
                    config,
                    {
                        reader: reader,
                        discoveryService: discovery,
                        logger: winstonLogger
                    }
                  )
                );
            },
        });
    },
});

backend.add(libraryCheckModule);

** THIS IS NOT A FULLY WORKING IMPLEMENTATION AT THIS POINT **
When I run backstage, and the "import" of all the library files starts, everything seems to fail.
A small excerpt of the logs that indicate failure:

backstage-application  | {"level":"info","message":"LibraryCheckProcessor: Saved entity metadata libraries on database","plugin":"catalog","service":"***"}
backstage-application  | {"level":"info","message":"[10/Dec/2024:06:38:56 +0000] \"POST /api/library-check/libraries HTTP/1.1\" 404 - \"-\" \"axios/1.7.8\"","service":"rootHttpRouter","type":"incomingRequest"}                                                                                                                               
backstage-application  | {"level":"info","message":"LibraryCheckProcessor: Descriptor files found at https://github.com/webgrip/github-webhook-observer/tree/main/**/requirements.txt","plugin":"catalog","service":"***"}                                                                                                                      
backstage-application  | {"level":"info","message":"LibraryCheckProcessor: Descriptor files found at https://github.com/webgrip/github-webhook-observer/tree/main/**/package.json","plugin":"catalog","service":"***"}                                                                                                                          
backstage-application  | {"level":"info","message":"LibraryCheckProcessor: Saved entity metadata libraries on database","plugin":"catalog","service":"***"}
backstage-application  | LibraryCheckService: Error trying to save libraries on database                                                                                
backstage-application  | {"level":"info","message":"[10/Dec/2024:06:38:56 +0000] \"POST /api/library-check/libraries/search HTTP/1.1\" 404 - \"-\" \"axios/1.7.8\"","service":"rootHttpRouter","type":"incomingRequest"}
backstage-application  | {"level":"info","message":"LibraryCheckProcessor: Saved entity metadata libraries on database","plugin":"catalog","service":"***"}
backstage-application  | {"level":"info","message":"LibraryCheckProcessor: Saved entity metadata libraries on database","plugin":"catalog","service":"***"}             
backstage-application  | {"level":"info","message":"LibraryCheckProcessor: Descriptor files found at https://github.com/webgrip/***-application/tree/main/**/package.json","plugin":"catalog","service":"***"}                                                                                                                                  
backstage-application  | LibraryCheckService: Error trying to search for libraries on database
backstage-application  | {"level":"info","message":"[10/Dec/2024:06:38:56 +0000] \"POST /api/library-check/libraries HTTP/1.1\" 404 - \"-\" \"axios/1.7.8\"","service":"rootHttpRouter","type":"incomingRequest"}                                                                                                                               
backstage-application  | {"level":"info","message":"[10/Dec/2024:06:38:56 +0000] \"POST /api/library-check/libraries-updates HTTP/1.1\" 404 - \"-\" \"axios/1.7.8\"","service":"rootHttpRouter","type":"incomingRequest"}                                                                                                                       
backstage-application  | {"level":"info","message":"[10/Dec/2024:06:38:56 +0000] \"POST /api/library-check/libraries HTTP/1.1\" 404 - \"-\" \"axios/1.7.8\"","service":"rootHttpRouter","type":"incomingRequest"}
backstage-application  | LibraryCheckService: Error trying to save libraries on database
backstage-application  | LibraryCheckService: Error trying to update libraries occurrences records on entities_libraries table AxiosError: Request failed with status code 404 

⛳️ Current behavior

Supports old backend

🚀 New behavior

Supports new backend

💣 Is this a breaking change (Yes/No):

Not sure yet, probably yes.

📝 Additional Information

I would like some help on this. I'm unfamiliar with the changes that one needs to make to migrate a backstage plugin to the new backend. It's been a slow process of trial and error so far. I'd like to leverage other people's expertise on the matter and hopefully start of a discussion on how this should be done.

Checklist

• Have you written tests for your changes?
• Have you successfully ran tests with your changes locally?
• Have you lint your code locally prior to submission?
• Have you updated the plugin documentation with the changes?

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