Realtime communication is any mode of communication in which all users can exchange information instantly or with negligible latency or transmission delays. Import 'package:shelf_web_socket/shelf_web_socket.dart' įinal _router = Router().Top Flutter Real-time Communication packages Import 'package:shelf_router/shelf_router.dart' Now that we have everything in place, let's replace our server.dart with the following implementation: import 'dart:io' Let's add it quickly: dart pub add shelf_web_socket The template already includes the Shelf and shelf-router dependencies, which provide routing capabilities.Īs mentioned earlier, we need an additional dependency to enable WebSockets in our project. In addition to our regular files, we have a server.dart file inside our bin folder. The structure of the generated project should look familiar to those who have worked with a Dart package before, with a few minor differences. We will see our basic structure in place. So if we run the command: dart create -template=server-shelf. As you may recall, when we use the dart create command, we have access to different templates. Let's start by creating a folder called shelf-server and using one of Dart's templates. This is because when working with Shelf, we only have access to the core, and then we can add as many Shelf-related packages as needed. To demonstrate a complete WebSocket example, we will be using shelf-web-socket in our project. In essence, even though Shelf is not a full-fledged server framework like Serverpod for Dart or Django for Python, it allows us to compose web servers in a modular way. As per their documentation, we have that: “Shelf makes it easy to create and compose web servers and parts of web servers” If you are not familiar with Shelf, it is a minimalist web server library for Dart. For our first example, we will use Shelf. The first step is to create our server and change the client communication. You can find the full working example on GitHub. While this may not be the most complex example, it's simple enough to help us understand how everything works under the hood. We will build on that example and add WebSocket communication so that any changes to our users are immediately reflected in our app. In our previous example, we built an app that retrieved users from a REST API using Dart Frog. Creating our WebSocket server using ShelfĪwesome! Now that we have a clear understanding of what WebSockets are, let's dive into some coding and build a server that supports this functionality. On the other hand, if we only need to consume static data that won't change, we may use HTTP with a traditional REST API. Examples include chat applications, trading apps, and games. WebSockets are particularly useful in situations where immediate communication with clients is necessary. This can result in unnecessary requests, especially if we're using a polling strategy. This allows us to push changes to the client whenever necessary, as opposed to using HTTPS, where the client needs to request updates, resulting in inefficiency as the updates may not be in real-time. WebSocket is a protocol, similar to HTTP, but with a crucial difference - it is bidirectional, meaning it keeps the connection between the client and server open. Let's start by exploring what WebSockets are and how they can be helpful. In those scenarios, we made the most of REST APIs and gRPC, but we're now exploring how WebSockets can take things to the next level with real-time updates! Get ready to dive in! WebSockets We've covered full-stack apps with Dart in the past using Dart Frog and gRPC, and we hope you've been following along. In the upcoming blog post, we'll be discussing how to integrate WebSockets into full-stack apps using Dart!
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