MusicCatalogue.Logic 1.5.0

MusicCatalogue

Overview

<img src="diagrams/application-schematic.png" alt="Application Schematic" width="600">

• The Music Catalogue repository is intended to provide a catalogue for a private music collection
• It supports the following functions:
  • Music catalogue collection browser
  • Album search
  • External API integration for looking up new albums
  • Data import from CSV format files
  • Data export as CSV or Excel workbooks
• It contains the following components:

• NuGet packages are available for the entities, data and logic
• A Docker build of the REST API is also available

The Console Lookup Tool

Overview

• The console application provides a simple command line interface for:
  • Looking up albums one at a time, given an artist and album title
  • Importing data from CSV files
  • Exporting data to CSV files or Excel workbooks
• The album lookup facility uses the algorithm described under "Album Lookup", below
• Consequently, searching for an album that's not currently in the catalogue will add it to the local database
• The console application doesn't use the web service (see below) and can be used standalone

Configuration

• The console application uses an "appsettings.json" file to hold configuration settings
• It's described in the "Application Configuration File" section, below

Command Line Options

• The following command line arguments are supported:

• For album lookups, it is recommended that the artist name and album title are both double-quoted
• This is mandatory if either contains spaces
• For data exports, the exported format is based on the file extension for the supplied file path:

CSV File Format

• The first row in the CSV file is expected to contain headers and is ignored
• All fields in the CSV file must be double-quoted and may not contain ","
• Durations should be specified in MM:SS format, e.g. "03:10" for 3 minutes and 10 seconds
• The following is an example, illustrating the format for the headers and for the rows containing data:

Artist,Album,Genre,Released,Cover Url,Track Number,Track,Duration
"Nat King Cole","After Midnight","Jazz","1957","","1","Just You Just Me","03:00"

Example - Album Lookup

MusicCatalogue.LookupTool --lookup "John Coltrane" "Blue Train"

• The output lists the album details and the number, title and duration of each track:

GUI

Overview

• The GUI is written using React.js
• It provides facilities to:
  • Browse the artists, albums and track lists in the collection
  • Perform album lookups, given an artist name and title
• The album lookup facility uses the algorithm described under "Album Lookup", below
• Consequently, searching for an album that's not currently in the catalogue will add it to the local database
• The GUI uses the web service (see below) to retrieve and lookup data

Configuration

• The UI uses a simple "config.json" file containing only one setting, the base URL for the Music Catalogue web service:

{
  "api": {
    "baseUrl": "http://localhost:8098"
  }
}

Login

• On browing to the application, the login dialog is displayed, prompting for a username and password
• This authenticates with the web service (see below), so a valid login in the local database is required
• Instructions on adding a user to the database are given in the "Database Users" section, below

Browsing the Catalogue

• After logging in, the "Artists" page is displayed, listing the artists currently in the database
• This acts as the home page for the site and clicking on the "Artists" menu item or the site logo navigates back to it

<img src="diagrams/artist-list.png" alt="Artist List" width="600">

• As the mouse pointer is moved up and down the table, the current row is highlighted
• Clicking on a row opens the album list for the artist shown in that row:

<img src="diagrams/album-list.png" alt="Album List" width="600">

• As the mouse pointer is moved up and down the table, the current row is highlighted
• Clicking on a row opens the track list for the album shown in that row:

<img src="diagrams/track-list.png" alt="Track List" width="600">

• Clicking on the artist name in any row in the track list or clicking on the "Back" button returns to the album list for that artist

Album Lookup

• To search for an album, click on the "Search" menu bar item:

<img src="diagrams/album-search.png" alt="Album Search" width="600">

• Enter the artist name and album title then click on "Lookup" to search for the album
• If the album is found, the track list for the album is displayed
• The album lookup facility uses the algorithm described under "Album Lookup", below
• Consequently, searching for an album that's not currently in the catalogue will add it to the local database

Data Import and Export

• These are scheduled for implementation in a future iteration of the UI

Web Service

Facilities

• The REST Web Service implements endpoints for
  • Authenticating registered users
  • Retrieving artist details from the local database
  • Retrieving album and track details from the local database
  • Looking up albums via the external APIs (see below)
• The external lookup uses the "album lookup" algorithm described under "Album Lookup", below
• Swagger documentation exposed at:

/swagger/index.html

• For full details of the service endpoints, it's recommended to build and run the service and review the documentation exposed at the above URL

Configuration

• The web service uses an "appsettings.json" file to hold configuration settings
• It's described in the "Application Configuration File" section, below

Authentication

• The service uses bearer token authentication, so clients should:
  • Use the /users/authenticate endpoint to get a token
  • Set the authorization header in subsequent requests:

Authorization: Bearer <token>

Database Users

• To authenticate, users must have a record in the USERS table of the database associating a username with their hashed password
• The following is a code snippet for adding a user to the database:

var userName = "SomeUser";
var password = "ThePassword";
var context = new MusicCatalogueDbContextFactory().CreateDbContext(Array.Empty<string>());
var factory = new MusicCatalogueFactory(context);
Task.Run(() => factory.Users.AddAsync(userName, password)).Wait();

Application Configuration File

• The console application and web service use a common configuration file format, described in this section
• The GUI has a much simpler configuration file that's described along with the UI, above

General Settings and Database Connection String

• The appsettings.json file in the console application project contains the following keys for controlling the application:

External API Configuration

• The lookup tool and web service include integration with the TheAudioDB public API for artist, album and track details lookup:

TheAudioDB

• To use the integration, a RapidAPI subscription is needed, as this includes an API key needed to acces the APIs
• Signup is free, but daily free usage is restricted with a nominal charge being made for requests above the free limit
• The integration is configured via the following keys in the configuration file:

ApiEndpoint Definitions

• An example API endpoint definition is shown below:

{
  "EndpointType": "Albums",
  "Service": "TheAudioDB",
  "Url": "https://theaudiodb.p.rapidapi.com/searchalbum.php"
}

• Possible values for the endpoint type are:

• Currently, only the TheAudioDB APIs are supported

ApiServiceKey Definitions

• An example key definition for a service is shown below:

{
  "Service": "TheAudioDB",
  "Key": "put-your-RapidPI-key-here"
}

Album Lookup

• The local SQLite database is searched preferentially for album details
• The external APIs are only used if an artist and/or album aren't found locally
• Details returned by the external APIs are stored in the local database provided the returned data is complete:
  • The artist is found
  • The album is found
  • The album has at least one track associated with it
• Consequently, subsequent searches with the same criteria will return data from the local database, not the APIs
• Artist names, album titles and track names are stored in title case
• Searches convert the search criteria to title case when looking details up in the database

SQLite Database

Database Schema

• Note that the "Duration" field on the TRACKS table denotes the track duration in ms

Database Management

• The application uses Entity Framework Core and initial creation and management of the database is achieved using EF Core database migrations
• To create the database for the first time, first install the .NET Core SDK and then install the "dotnet ef" tool:

dotnet tool install --global dotnet-ef

• Update the database path in the "appsettings.json" file in the terminal application project to point to the required database location
• Build the solution
• Open a terminal window and change to the MusicCatalogue.Data project
• Run the following command, making sure to use the path separator appropriate for your OS:

dotnet ef database update -s ../MusicCatalogue.LookupTool/MusicCatalogue.LookupTool.csproj

• If the database doesn't exist, it will create it
• It will then bring the database up to date by applying all pending migrations

Authors

• Dave Walker - Initial work - LinkedIn

Feedback

To file issues or suggestions, please use the Issues page for this project on GitHub.

License

This project is licensed under the MIT License - see the LICENSE file for details.