Add webhook callback support

Add webhook_url column to jobs table. POST /jobs endpoint accepts JSON payload with optional webhook_url. After job completion, worker POSTs to webhook with status and duration.

cmd/alpenqueue/main.go

@@ -3,7 +3,9 @@ package main
 import (
 	"alpenqueue/pkg/db"
 	"alpenqueue/pkg/worker"
+	"encoding/json"
 	"fmt"
+	"io"
 	"log"
 	"net/http"
 )
@@ -27,7 +29,14 @@ func main() {
 			return
 		}
 
-		id, err := db.CreateJob(database)
+		var req struct {
+			WebhookURL string `json:"webhook_url"`
+		}
+
+		body, _ := io.ReadAll(r.Body)
+		json.Unmarshal(body, &req)
+
+		id, err := db.CreateJob(database, req.WebhookURL)
 		if err != nil {
 			http.Error(w, err.Error(), http.StatusInternalServerError)
 			return

pkg/db/db.go

@@ -11,6 +11,7 @@ type Job struct {
 	ID         int
 	Status     string
 	CreatedAt  time.Time
+	WebhookURL string
 }
 
 func Init(dbPath string) (*sql.DB, error) {
@@ -23,7 +24,8 @@ func Init(dbPath string) (*sql.DB, error) {
 	CREATE TABLE IF NOT EXISTS jobs (
 		id INTEGER PRIMARY KEY AUTOINCREMENT,
 		status TEXT NOT NULL DEFAULT 'pending',
-		created_at DATETIME DEFAULT CURRENT_TIMESTAMP
+		created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+		webhook_url TEXT
 	);`
 
 	_, err = db.Exec(schema)
@@ -34,8 +36,8 @@ func Init(dbPath string) (*sql.DB, error) {
 	return db, nil
 }
 
-func CreateJob(db *sql.DB) (int64, error) {
-	result, err := db.Exec("INSERT INTO jobs (status) VALUES ('pending')")
+func CreateJob(db *sql.DB, webhookURL string) (int64, error) {
+	result, err := db.Exec("INSERT INTO jobs (status, webhook_url) VALUES ('pending', ?)", webhookURL)
 	if err != nil {
 		return 0, err
 	}
@@ -43,7 +45,7 @@ func CreateJob(db *sql.DB) (int64, error) {
 }
 
 func GetPendingJobs(db *sql.DB) ([]Job, error) {
-	rows, err := db.Query("SELECT id, status, created_at FROM jobs WHERE status = 'pending'")
+	rows, err := db.Query("SELECT id, status, created_at, webhook_url FROM jobs WHERE status = 'pending'")
 	if err != nil {
 		return nil, err
 	}
@@ -52,7 +54,7 @@ func GetPendingJobs(db *sql.DB) ([]Job, error) {
 	var jobs []Job
 	for rows.Next() {
 		var job Job
-		if err := rows.Scan(&job.ID, &job.Status, &job.CreatedAt); err != nil {
+		if err := rows.Scan(&job.ID, &job.Status, &job.CreatedAt, &job.WebhookURL); err != nil {
 			return nil, err
 		}
 		jobs = append(jobs, job)

pkg/worker/worker.go

@@ -2,8 +2,12 @@ package worker
 
 import (
 	"alpenqueue/pkg/db"
+	"bytes"
 	"database/sql"
+	"encoding/json"
+	"fmt"
 	"log"
+	"net/http"
 	"time"
 )
 
@@ -19,8 +23,28 @@ func Start(database *sql.DB) {
 
 			for _, job := range jobs {
 				log.Printf("Processing job %d", job.ID)
+				start := time.Now()
+
 				time.Sleep(2 * time.Second)
 
+				duration := time.Since(start)
+
+				if job.WebhookURL != "" {
+					payload := map[string]string{
+						"status": "ok",
+						"took":   fmt.Sprintf("%.1fs", duration.Seconds()),
+					}
+					jsonData, _ := json.Marshal(payload)
+
+					resp, err := http.Post(job.WebhookURL, "application/json", bytes.NewBuffer(jsonData))
+					if err != nil {
+						log.Printf("Error posting webhook for job %d: %v", job.ID, err)
+					} else {
+						resp.Body.Close()
+						log.Printf("Webhook posted for job %d", job.ID)
+					}
+				}
+
 				if err := db.MarkJobDone(database, job.ID); err != nil {
 					log.Printf("Error marking job %d done: %v", job.ID, err)
 				} else {