Cosmonaut 2.7.1

Cosmonaut

The word was derived from "kosmos" (Ancient Greek: κόσμος) which means world/universe and "nautes" (Ancient Greek: ναῦς) which means sailor/navigator

Cosmonaut is a supercharged SDK with object mapping capabilities that enables .NET developers to work with CosmosDB. It eliminates the need for most of the data-access code that developers usually need to write.

Getting started

• How to easily start using CosmosDB in your C# application in no time with Cosmonaut
• (Video) Getting started with .NET Core and CosmosDB using Cosmonaut
• (Video) How to save money in CosmosDB with Cosmonaut's Collection Sharing
• CosmosDB Fluent Pagination with Cosmonaut
• Implementing server side CosmosDB pagination in a Blazor Web App (Part 1: Page Number and Page Size)
• Implementing server side CosmosDB pagination in a Blazor Web App (Part 2: Next/Previous Page)

Samples

• The samples folder in this project
• Web app server-side pagination for CosmosDB

Usage

The idea is pretty simple. You can have one CosmosStore per entity (POCO/dtos etc). This entity will be used to create a collection or use part of a one in CosmosDB and it will offer all the data access for this object.

Registering the CosmosStores in ServiceCollection for DI support

 var cosmosSettings = new CosmosStoreSettings("<<databaseName>>", "<<cosmosUri>>", "<<authkey>>");
                
serviceCollection.AddCosmosStore<Book>(cosmosSettings);

//or just by using the Action extension

serviceCollection.AddCosmosStore<Book>("<<databaseName>>", "<<cosmosUri>>", "<<authkey>>", settings =>
{
    settings.ConnectionPolicy = connectionPolicy;
    settings.DefaultCollectionThroughput = 5000;
    settings.IndexingPolicy = new IndexingPolicy(new RangeIndex(DataType.Number, -1),
        new RangeIndex(DataType.String, -1));
});

//or just initialise the object

ICosmosStore<Book> bookStore = new CosmosStore<Book>(cosmosSettings)

To use the AddCosmosStore extension methods you need to install the Cosmonaut.Extensions.Microsoft.DependencyInjection package.

Install-Package Cosmonaut.Extensions.Microsoft.DependencyInjection
or
dotnet add package Cosmonaut.Extensions.Microsoft.DependencyInjection

Retrieving an entity by id (and partition key)

var user = await cosmosStore.FindAsync("userId");
var user = await cosmosStore.FindAsync("userId", "partitionKey");
var user = await cosmosStore.FindAsync("userId", new RequestOptions());

Quering for entities using LINQ

In order to query for entities all you have to do is call the .Query() method and then use LINQ to create the query you want. It is HIGHLY recommended that you use one of the Async methods to get the results back, such as ToListAsync or FirstOrDefaultAsync , when available.

var user = await cosmoStore.Query().FirstOrDefaultAsync(x => x.Username == "elfocrash");
var users = await cosmoStore.Query().Where(x => x.HairColor == HairColor.Black).ToListAsync(cancellationToken);

Quering for entities using SQL

// plain sql query
var user = await cosmoStore.QueryMultipleAsync("select * from c w.Firstname = 'Smith'");

// or parameterised sql query
var user = await cosmoStore.QueryMultipleAsync("select * from c w.Firstname = @name", new { name = "Smith" });

Collection sharing

Cosmonaut is all about making the integration with CosmosDB easy as well as making things like cost optimisation part of the library.

That's why Cosmonaut support collection sharing between different types of entities.

Why would you do that?

Cosmos is charging you based on how many RU/s your individual collection is provisioned at. This means that if you don't need to have one collection per entity because you won't use it that much, even on the minimum 400 RU/s, you will be charged money. That's where the magic of schemaless comes in.

How can you do that?

Well it's actually pretty simple. Just implement the ISharedCosmosEntity interface and decorate your object with the SharedCosmosCollection attribute.

The attribute accepts two properties, SharedCollectionName which is mandatory and EntityName which is optional. The SharedCollectionName property will be used to name the collection that the entity will share with other entities.

The EntityName will be used to make the object identifiable for Cosmosnaut. Be default it will pluralize the name of the class, but you can specify it to override this behavior. You can override this by providing your own name by setting the EntityName value at the attribute level.

Once you set this up you can add individual CosmosStores with shared collections.

Pagination

Cosmonaut supports two types of pagination.

• Page number + Page size
• ContinuationToken + Page size

Both of there methods work by adding the .WithPagination() method after you used any of the Query methods.

var firstPage = await booksStore.Query().WithPagination(1, 10).OrderBy(x=>x.Name).ToListAsync();
var secondPage = await booksStore.Query().WithPagination(2, 10).OrderBy(x => x.Name).ToPagedListAsync();
var thirdPage = await booksStore.Query().WithPagination(secondPage.NextPageToken, 10).OrderBy(x => x.Name).ToPagedListAsync();
var fourthPage = await thirdPage.GetNextPageAsync();
var fifthPage = await booksStore.Query().WithPagination(5, 10).OrderBy(x => x.Name).ToListAsync();

ToListAsync() on a paged query will just return the results. ToPagedListAsync() on the other hand will return a CosmosPagedResults object. This object contains the results but also a boolean indicating whether there are more pages after the one you just got but also the continuation token you need to use to get the next page.