Open up src/app/ in your text editor and change it to look like this: Let’s create the HTML template and styles for the application. Now, go ahead and start your server by running node server.js to make it available on PORT 5500. env file in your project root and paste in your Stream credentials, as shown below: We need to set up some environmental variables before we can start the server. You can learn more about channel types here, including how to create your own, if the defaults don’t work for you. By default, user tokens are valid indefinitely you can set an expiration on a token by passing the number of seconds till expiration as the second parameter.Īfter this, the user is added to a channel of the team type whose ID is set to talkshop and the generated token is sent back to the client to enable user authentication on the frontend. When this happens, an authentication token is generated for the user who will be created on the chat instance (or updated if the user already exists). Our server contains only one route ( /join), which expects a username to be included in the request body. Setting Up the ServerĬreate a new server.js file in your project directory and populate it with the following code: Open in your browser to view the running application. Update your file to include the " node" " types" definitions as shown below:Īt this point, you can run ng serve to start the development server. The package is necessary to provide "type" definitions for Node.js. Next, install the additional dependencies we’ll be making use of: When prompted to add Angular routing, hit N, and choose CSS as the preferred stylesheet format. Our chat app will be a group chat like Discord where people can join in and discuss matters with the members.Run the command below to create a new Angular app with Angular CLI. We have known what gRPC and how it works, now let's proceed to build our chat app. The client is where the methods in the gRPC server are called from. These methods perform an action on the server. The server as we already know contains methods/sub-routines/procedures, anything you choose to call it. According to Kasun Indrasiri and Danesh Kuruppu in gRPC: Up and Running, The service interface definition contains information on how your service can be consumed by consumers, what methods you allow the consumers to call remotely, what method parameters and message formats to use when invoking those methods, and so on. This is also where the service interface between the server and the client is defined. gRPC uses this to serialize the request and response message format between the server and the client. Protocol Buffer is an open-source serialization tool built by Google. GRPC has three components: Protocol Buffer, server, and client. This server service contains methods that can be called by the gRPC clients from anywhere in the world from any machine or platform. gRPC is awesome in that it creates a server service in a language and the service can be consumed from another platform in another language. It uses the concept of message passing to signal a sub-routine residing in another system to execute. GRPC is an inter-process communication technology that is used to execute remote sub-routines in a different address space. Let's see how it's done, but first, let's learn what gRPC is. The chat messages sending back and forth will be handled by a gRPC service. We will describe in detail how you can set up a gRPC service and then communicate with it from a React app. In this tutorial, we will demonstrate how to use gRPC by building a chat app.
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