Step by Step Guide to Building an Affinity API Integration in Go

Introduction

Hey there, fellow Go enthusiast! Ready to dive into the world of Affinity API integration? You're in for a treat. Affinity's API is a powerhouse for managing relationships and data, and we're about to harness that power with our favorite language: Go. This guide will walk you through creating a robust integration that'll have you manipulating Affinity data like a pro.

Prerequisites

Before we jump in, make sure you've got:

• Go installed (I know, obvious, right?)
• Affinity API credentials (if you don't have these, hop over to Affinity's developer portal)
• Your Go workspace set up and ready to rock

Setting up the project

Let's kick things off by creating a new project:

mkdir affinity-integration
cd affinity-integration
go mod init affinity-integration

Now, let's grab the packages we'll need:

go get github.com/go-resty/resty/v2
go get github.com/spf13/viper

Authentication

Alright, time to get cozy with Affinity. First, snag your API key from the Affinity dashboard. Now, let's set it up in our code:

package main

import (
    "github.com/go-resty/resty/v2"
    "github.com/spf13/viper"
)

func main() {
    viper.SetConfigFile(".env")
    viper.ReadInConfig()
    apiKey := viper.GetString("AFFINITY_API_KEY")

    client := resty.New()
    client.SetHeader("Authorization", "Bearer "+apiKey)
}

Making API requests

Now that we're authenticated, let's create a function to make API calls:

func makeRequest(client *resty.Client, method, endpoint string, body interface{}) (*resty.Response, error) {
    url := "https://api.affinity.co" + endpoint
    var resp *resty.Response
    var err error

    switch method {
    case "GET":
        resp, err = client.R().Get(url)
    case "POST":
        resp, err = client.R().SetBody(body).Post(url)
    // Add other methods as needed
    }

    return resp, err
}

Implementing key Affinity API endpoints

Let's implement some core functionality:

func getLists(client *resty.Client) ([]List, error) {
    resp, err := makeRequest(client, "GET", "/lists", nil)
    if err != nil {
        return nil, err
    }
    
    var lists []List
    err = json.Unmarshal(resp.Body(), &lists)
    return lists, err
}

func createPerson(client *resty.Client, person Person) (Person, error) {
    resp, err := makeRequest(client, "POST", "/persons", person)
    if err != nil {
        return Person{}, err
    }
    
    var createdPerson Person
    err = json.Unmarshal(resp.Body(), &createdPerson)
    return createdPerson, err
}

Error handling and logging

Don't forget to handle those pesky errors:

if err != nil {
    log.Printf("Error: %v", err)
    // Handle the error appropriately
}

Data processing and storage

Once you've got your data, you might want to store it:

func saveToDatabase(data interface{}) error {
    // Implement your database logic here
}

Building a simple CLI tool

Let's wrap this up in a neat CLI package:

package main

import (
    "flag"
    "fmt"
)

func main() {
    action := flag.String("action", "", "Action to perform (get-lists, create-person)")
    flag.Parse()

    switch *action {
    case "get-lists":
        lists, err := getLists(client)
        if err != nil {
            fmt.Printf("Error getting lists: %v\n", err)
            return
        }
        fmt.Printf("Lists: %+v\n", lists)
    case "create-person":
        // Implement create person logic
    default:
        fmt.Println("Unknown action")
    }
}

Testing the integration

Don't forget to test your code! Here's a simple test to get you started:

func TestGetLists(t *testing.T) {
    client := setupTestClient()
    lists, err := getLists(client)
    if err != nil {
        t.Errorf("Error getting lists: %v", err)
    }
    if len(lists) == 0 {
        t.Error("No lists returned")
    }
}

Best practices and optimization

Remember to:

• Keep your code modular
• Use meaningful variable names
• Handle rate limiting (Affinity has limits, you know!)
• Cache responses when appropriate

Conclusion

And there you have it! You've just built a solid foundation for your Affinity API integration in Go. From here, sky's the limit. You can expand on this to create full-fledged applications, automate your workflows, or even build your own CRM system.

Remember, the Affinity API documentation is your best friend. Don't hesitate to dive deeper into their docs for more advanced features.

Now go forth and code! Your Affinity data is waiting to be tamed by your Go prowess. Happy coding!