Step by Step Guide to Building a Donorbox API Integration in Go

Introduction

Hey there, fellow Go enthusiast! Ready to supercharge your fundraising efforts with Donorbox? Let's dive into building a robust API integration that'll have you managing donations like a pro in no time.

Prerequisites

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

• A Go environment set up and ready to roll
• Your Donorbox API credentials (if you don't have them yet, hop over to your Donorbox account and grab 'em)

Setting up the project

Let's kick things off by creating a new Go module:

mkdir donorbox-integration && cd donorbox-integration
go mod init github.com/yourusername/donorbox-integration

Now, let's grab the HTTP client we'll need:

go get -u github.com/go-resty/resty/v2

Authentication

Donorbox uses API key authentication. Let's set that up:

package main

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

const (
    baseURL = "https://donorbox.org/api/v1"
    apiKey  = "your-api-key-here"
)

func main() {
    client := resty.New().
        SetBaseURL(baseURL).
        SetHeader("Authorization", "Bearer "+apiKey)
}

Making API requests

Now that we've got our client set up, let's make some requests!

Implementing key Donorbox API endpoints

Fetching donations

func fetchDonations(client *resty.Client) ([]Donation, error) {
    var response struct {
        Donations []Donation `json:"donations"`
    }
    
    _, err := client.R().
        SetResult(&response).
        Get("/donations")
    
    return response.Donations, err
}

Creating a donation

func createDonation(client *resty.Client, donation Donation) error {
    _, err := client.R().
        SetBody(donation).
        Post("/donations")
    
    return err
}

Retrieving donor information

func getDonor(client *resty.Client, donorID string) (Donor, error) {
    var donor Donor
    
    _, err := client.R().
        SetResult(&donor).
        Get("/donors/" + donorID)
    
    return donor, err
}

Error handling and response parsing

Donorbox returns errors in a consistent format. Let's handle them:

type APIError struct {
    Message string `json:"message"`
}

func handleAPIError(resp *resty.Response) error {
    if resp.IsError() {
        var apiError APIError
        if err := json.Unmarshal(resp.Body(), &apiError); err != nil {
            return fmt.Errorf("unknown error: %s", resp.Status())
        }
        return fmt.Errorf("API error: %s", apiError.Message)
    }
    return nil
}

Implementing pagination

Donorbox uses cursor-based pagination. Here's how to handle it:

func fetchAllDonations(client *resty.Client) ([]Donation, error) {
    var allDonations []Donation
    cursor := ""
    
    for {
        var response struct {
            Donations []Donation `json:"donations"`
            Meta struct {
                NextCursor string `json:"next_cursor"`
            } `json:"meta"`
        }
        
        _, err := client.R().
            SetQueryParam("cursor", cursor).
            SetResult(&response).
            Get("/donations")
        
        if err != nil {
            return nil, err
        }
        
        allDonations = append(allDonations, response.Donations...)
        
        if response.Meta.NextCursor == "" {
            break
        }
        
        cursor = response.Meta.NextCursor
    }
    
    return allDonations, nil
}

Rate limiting considerations

Donorbox has rate limits, so let's be good citizens:

func main() {
    client := resty.New().
        SetBaseURL(baseURL).
        SetHeader("Authorization", "Bearer "+apiKey).
        SetRetryCount(3).
        SetRetryWaitTime(5 * time.Second)
}

Testing the integration

Don't forget to test! Here's a quick example:

func TestFetchDonations(t *testing.T) {
    mockServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        w.WriteHeader(http.StatusOK)
        w.Write([]byte(`{"donations": [{"id": "123", "amount": 50}]}`))
    }))
    defer mockServer.Close()

    client := resty.New().SetBaseURL(mockServer.URL)
    donations, err := fetchDonations(client)

    assert.NoError(t, err)
    assert.Len(t, donations, 1)
    assert.Equal(t, "123", donations[0].ID)
}

Best practices and optimization

• Cache frequently accessed data to reduce API calls
• Use goroutines for concurrent API requests when appropriate
• Implement exponential backoff for retries

Conclusion

And there you have it! You've just built a solid Donorbox API integration in Go. Remember, this is just the beginning - there's always room to expand and optimize. Keep exploring the API docs, and happy coding!