Create a web server that uses an event handler

Sets up and starts a web application on port 8080.

Explore further

For detailed documentation that includes this code sample, see the following:

• Tutorial: Debug routing events to Cloud Run

Code sample

C#

To authenticate to Eventarc, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

    public static void Main(string[] args)
    {
        CreateHostBuilder(args).Build().Run();
    }
    public static IHostBuilder CreateHostBuilder(string[] args)
    {
        var port = Environment.GetEnvironmentVariable("PORT") ?? "8080";
        var url = $"http://0.0.0.0:{port}";

        return Host.CreateDefaultBuilder(args)
            .ConfigureWebHostDefaults(webBuilder =>
            {
                webBuilder.UseStartup<Startup>().UseUrls(url);
            });
    }

Go

To authenticate to Eventarc, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

func main() {
	http.HandleFunc("/", HelloEventsStorage)
	// Determine port for HTTP service.
	port := os.Getenv("PORT")
	if port == "" {
		port = "8080"
	}
	// Start HTTP server.
	log.Printf("Listening on port %s", port)
	if err := http.ListenAndServe(":"+port, nil); err != nil {
		log.Fatal(err)
	}
}

Java

To authenticate to Eventarc, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {
  public static void main(String[] args) {
    SpringApplication.run(Application.class, args);
  }
}

Node.js

To authenticate to Eventarc, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

const app = require('./app.js');
const PORT = parseInt(process.env.PORT) || 8080;

app.listen(PORT, () =>
  console.log(`nodejs-events-storage listening on port ${PORT}`)
);

Python

To authenticate to Eventarc, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

import os

from cloudevents.http import from_http

from flask import Flask, request

app = Flask(__name__)
if __name__ == "__main__":
    app.run(debug=True, host="0.0.0.0", port=int(os.environ.get("PORT", 8080)))

What's next

To search and filter code samples for other Google Cloud products, see the Google Cloud sample browser.