Application of Golang functions in processing web hooks

How to use functions to handle Webhooks in Go: Use func to declare functions to handle HTTP requests. Parse the request body, verify the signature or token, and trigger the corresponding processing logic. It can be used as a practical case for processing Github Webhook, using the Github Webhook API to trigger different processing logic when specific events occur, such as processing Pull Request or Push events.

Using functions in Go to handle Webhooks

Using functions in Go is an efficient and lightweight way to handle Webhooks. Quantitative method. Webhooks are an HTTP callback mechanism that allow third-party applications to receive notifications when specific events occur.

Declaration of function

The function definition in Go uses the func keyword, followed by the function name and parameter list:

func handleWebhook(w http.ResponseWriter, r *http.Request) {
    // 根据 Webhook 内容处理逻辑...
}

Event processing

The basic process of processing Webhook events includes:

1. Parse the request body.
2. Verify the legitimacy of the request (e.g., signature or token verification).
3. Trigger appropriate processing logic based on event type.

Practical case: Handling Github Webhook

Github provides a Webhook API for sending notifications when events occur in the code warehouse (such as pushing to the master branch) . In Go, we can use the following code to handle Github Webhooks:

import (
    "encoding/json"
    "fmt"
    "github.com/google/go-github/github"
    "github.com/google/go-github/v32/github/apps"
    "net/http"
)

// GithubWebhookHandler 处理 Github Webhook 请求。
func GithubWebhookHandler(w http.ResponseWriter, r *http.Request) {
    if r.Method != "POST" {
        http.Error(w, "Invalid request method", 405)
        return
    }

    webhookID := r.Header.Get("X-Github-Delivery")
    msg, err := github.ValidatePayload(r, []byte(webhookSecret))
    if err != nil {
        http.Error(w, fmt.Sprintf("Validation failed: %s", err), 401)
        return
    }

    var event github.WebhookEvent
    if err := json.Unmarshal(msg, &event); err != nil {
        http.Error(w, fmt.Sprintf("Unmarshaling failed: %s", err), 400)
        return
    }

    switch event.Type {
    case "pull_request":
        handlePullRequestEvent(&event, w)
    case "push":
        handlePushEvent(&event, w)
    default:
        fmt.Fprintf(w, "Received webhook event of type %s", event.Type)
    }
}

// handlePullRequestEvent 处理 pull_request Webhook 事件。
func handlePullRequestEvent(event *github.WebhookEvent, w http.ResponseWriter) {
    if e, ok := event.Payload.(*github.PullRequestEvent); ok {
        if *e.Action == "closed" {
            if e.PullRequest.Merged != nil && *e.PullRequest.Merged {
                fmt.Fprintf(w, "Pull request %d was merged.", *e.Number)
            } else {
                fmt.Fprintf(w, "Pull request %d was closed.", *e.Number)
            }
        }
    }
}

// handlePushEvent 处理 push Webhook 事件。
func handlePushEvent(event *github.WebhookEvent, w http.ResponseWriter) {
    if e, ok := event.Payload.(*github.PushEvent); ok {
        fmt.Fprintf(w, "Push event received: %+v", e)
    }
}

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