Step by Step Guide to Building a Travis CI API Integration in C#

Introduction

Hey there, fellow developer! Ready to supercharge your CI/CD workflow with Travis CI? In this guide, we'll walk through building a robust Travis CI API integration using C#. We'll cover everything from authentication to webhooks, so buckle up and let's dive in!

Prerequisites

Before we start coding, make sure you've got:

• Visual Studio or your favorite C# IDE
• .NET Core SDK
• A Travis CI account and API token (grab one from your Travis CI settings)

Got all that? Great! Let's get our hands dirty.

Setting up the project

First things first, fire up Visual Studio and create a new C# console application. We'll need a few NuGet packages to make our lives easier:

Install-Package RestSharp
Install-Package Newtonsoft.Json

These will handle our HTTP requests and JSON parsing, respectively.

Authenticating with Travis CI API

Alright, security first! Let's set up our authentication:

var client = new RestClient("https://api.travis-ci.com");
client.AddDefaultHeader("Travis-API-Version", "3");
client.AddDefaultHeader("Authorization", $"token {yourApiToken}");

Pro tip: Never hardcode your API token. Use environment variables or a secure secret manager.

Making API requests

Now that we're authenticated, let's make our first request:

var request = new RestRequest("user", Method.GET);
var response = await client.ExecuteAsync(request);

if (response.IsSuccessful)
{
    Console.WriteLine(response.Content);
}
else
{
    Console.WriteLine($"Error: {response.ErrorMessage}");
}

Easy peasy, right? This fetches your user information.

Implementing key Travis CI API endpoints

Let's implement some crucial endpoints:

Fetching repository information

var repoRequest = new RestRequest($"repo/{owner}%2F{repoName}", Method.GET);
var repoResponse = await client.ExecuteAsync(repoRequest);

Retrieving build status

var buildRequest = new RestRequest($"repo/{owner}%2F{repoName}/builds", Method.GET);
var buildResponse = await client.ExecuteAsync(buildRequest);

Triggering new builds

var triggerRequest = new RestRequest($"repo/{owner}%2F{repoName}/requests", Method.POST);
triggerRequest.AddJsonBody(new { request = new { branch = "main" } });
var triggerResponse = await client.ExecuteAsync(triggerRequest);

Parsing and processing API responses

Time to make sense of all that JSON:

var buildInfo = JsonConvert.DeserializeObject<BuildInfo>(buildResponse.Content);
Console.WriteLine($"Latest build status: {buildInfo.Builds[0].State}");

Implementing webhook support (optional)

Want to react to Travis CI events in real-time? Set up a webhook endpoint:

[HttpPost]
public IActionResult WebhookEndpoint([FromBody] dynamic payload)
{
    // Process the webhook payload
    return Ok();
}

Remember to validate the payload to ensure it's coming from Travis CI!

Error handling and logging

Don't let errors catch you off guard. Implement robust error handling:

try
{
    // Your API call here
}
catch (Exception ex)
{
    Logger.LogError($"API call failed: {ex.Message}");
    // Handle the error gracefully
}

Testing the integration

Test, test, and test again! Write unit tests for your key components and integration tests to ensure everything plays nicely with Travis CI.

Best practices and optimization

Keep these in mind:

• Respect rate limits (check the X-RateLimit-* headers)
• Implement caching where appropriate to reduce API calls
• Use async/await for better performance

Conclusion

And there you have it! You've just built a solid Travis CI API integration in C#. Remember, this is just the beginning – there's so much more you can do with the Travis CI API. Keep exploring, keep building, and most importantly, keep automating!

For more details, check out the Travis CI API documentation. Happy coding!