Add recurring job scheduling with frequency

Add frequency_minutes field to schedule recurring jobs. Jobs with frequency > 0 run repeatedly at specified intervals, automatically rescheduling after each execution. One-time jobs (frequency = 0) remain unchanged. Status transitions from pending to active for recurring jobs.

.gitignore

@@ -0,0 +1 @@
+*.db

cmd/alpenqueue/main.go

@@ -0,0 +1,54 @@
+package main
+
+import (
+	"alpenqueue/pkg/db"
+	"alpenqueue/pkg/worker"
+	"encoding/json"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+)
+
+func main() {
+	database, err := db.Init("./alpenqueue.db")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer database.Close()
+
+	worker.Start(database)
+
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte("AlpenQueue running!"))
+	})
+
+	http.HandleFunc("/jobs", func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodPost {
+			http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+			return
+		}
+
+		var req struct {
+			WebhookURL       string `json:"webhook_url"`
+			URL              string `json:"url"`
+			Selector         string `json:"selector"`
+			FrequencyMinutes int    `json:"frequency_minutes"`
+		}
+
+		body, _ := io.ReadAll(r.Body)
+		json.Unmarshal(body, &req)
+
+		id, err := db.CreateJob(database, req.WebhookURL, req.URL, req.Selector, req.FrequencyMinutes)
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+
+		w.WriteHeader(http.StatusCreated)
+		fmt.Fprintf(w, "Job %d created\n", id)
+	})
+
+	log.Println("Server starting on :8080")
+	http.ListenAndServe(":8080", nil)
+}

go.mod

@@ -0,0 +1,11 @@
+module alpenqueue
+
+go 1.25.4
+
+require (
+	github.com/PuerkitoBio/goquery v1.10.3 // indirect
+	github.com/andybalholm/cascadia v1.3.3 // indirect
+	github.com/mattn/go-sqlite3 v1.14.32 // indirect
+	github.com/temoto/robotstxt v1.1.2 // indirect
+	golang.org/x/net v0.47.0 // indirect
+)

go.sum

@@ -0,0 +1,79 @@
+github.com/PuerkitoBio/goquery v1.10.3 h1:pFYcNSqHxBD06Fpj/KsbStFRsgRATgnf3LeXiUkhzPo=
+github.com/PuerkitoBio/goquery v1.10.3/go.mod h1:tMUX0zDMHXYlAQk6p35XxQMqMweEKB7iK7iLNd4RH4Y=
+github.com/andybalholm/cascadia v1.3.3 h1:AG2YHrzJIm4BZ19iwJ/DAua6Btl3IwJX+VI4kktS1LM=
+github.com/andybalholm/cascadia v1.3.3/go.mod h1:xNd9bqTn98Ln4DwST8/nG+H0yuB8Hmgu1YHNnWw0GeA=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
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pkg/db/db.go

@@ -0,0 +1,114 @@
+package db
+
+import (
+	"database/sql"
+	"time"
+
+	_ "github.com/mattn/go-sqlite3"
+)
+
+type Job struct {
+	ID               int
+	Status           string
+	CreatedAt        time.Time
+	WebhookURL       string
+	URL              string
+	Selector         string
+	ExtractedContent string
+	RawHTML          string
+	FrequencyMinutes int
+	NextRunAt        time.Time
+}
+
+func Init(dbPath string) (*sql.DB, error) {
+	db, err := sql.Open("sqlite3", dbPath)
+	if err != nil {
+		return nil, err
+	}
+
+	schema := `
+	CREATE TABLE IF NOT EXISTS jobs (
+		id INTEGER PRIMARY KEY AUTOINCREMENT,
+		status TEXT NOT NULL DEFAULT 'pending',
+		created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+		webhook_url TEXT,
+		url TEXT,
+		selector TEXT,
+		extracted_content TEXT,
+		raw_html TEXT,
+		frequency_minutes INTEGER DEFAULT 0,
+		next_run_at DATETIME
+	);`
+
+	_, err = db.Exec(schema)
+	if err != nil {
+		return nil, err
+	}
+
+	return db, nil
+}
+
+func CreateJob(db *sql.DB, webhookURL, url, selector string, frequencyMinutes int) (int64, error) {
+	nextRunAt := time.Now()
+	result, err := db.Exec("INSERT INTO jobs (status, webhook_url, url, selector, frequency_minutes, next_run_at) VALUES ('pending', ?, ?, ?, ?, ?)",
+		webhookURL, url, selector, frequencyMinutes, nextRunAt)
+	if err != nil {
+		return 0, err
+	}
+	return result.LastInsertId()
+}
+
+func GetPendingJobs(db *sql.DB) ([]Job, error) {
+	now := time.Now()
+	rows, err := db.Query(`SELECT id, status, created_at, webhook_url, url, selector, extracted_content, raw_html, frequency_minutes, next_run_at
+		FROM jobs
+		WHERE (status = 'pending' OR status = 'active') AND next_run_at <= ?`, now)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var jobs []Job
+	for rows.Next() {
+		var job Job
+		var webhookURL, url, selector, extractedContent, rawHTML sql.NullString
+		var nextRunAt sql.NullTime
+		if err := rows.Scan(&job.ID, &job.Status, &job.CreatedAt, &webhookURL, &url, &selector, &extractedContent, &rawHTML, &job.FrequencyMinutes, &nextRunAt); err != nil {
+			return nil, err
+		}
+		job.WebhookURL = webhookURL.String
+		job.URL = url.String
+		job.Selector = selector.String
+		job.ExtractedContent = extractedContent.String
+		job.RawHTML = rawHTML.String
+		if nextRunAt.Valid {
+			job.NextRunAt = nextRunAt.Time
+		}
+		jobs = append(jobs, job)
+	}
+	return jobs, nil
+}
+
+func UpdateJobContent(db *sql.DB, id int, content string) error {
+	_, err := db.Exec("UPDATE jobs SET extracted_content = ? WHERE id = ?", content, id)
+	return err
+}
+
+func UpdateJobHTML(db *sql.DB, id int, html string) error {
+	_, err := db.Exec("UPDATE jobs SET raw_html = ? WHERE id = ?", html, id)
+	return err
+}
+
+func MarkJobDone(db *sql.DB, id int) error {
+	_, err := db.Exec("UPDATE jobs SET status = 'done' WHERE id = ?", id)
+	return err
+}
+
+func UpdateNextRun(db *sql.DB, id int, frequencyMinutes int) error {
+	if frequencyMinutes > 0 {
+		nextRunAt := time.Now().Add(time.Duration(frequencyMinutes) * time.Minute)
+		_, err := db.Exec("UPDATE jobs SET status = 'active', next_run_at = ? WHERE id = ?", nextRunAt, id)
+		return err
+	}
+	return MarkJobDone(db, id)
+}

pkg/worker/worker.go

@@ -0,0 +1,180 @@
+package worker
+
+import (
+	"alpenqueue/pkg/db"
+	"bytes"
+	"database/sql"
+	"encoding/json"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+
+	"github.com/PuerkitoBio/goquery"
+	"github.com/temoto/robotstxt"
+)
+
+const userAgent = "AlpenQueue/1.0 (+https://github.com/yourusername/alpenqueue)"
+
+func extractContent(body io.Reader, selector string) string {
+	if selector == "" {
+		selector = "title"
+	}
+
+	doc, err := goquery.NewDocumentFromReader(body)
+	if err != nil {
+		return ""
+	}
+
+	var results []string
+	doc.Find(selector).Each(func(i int, s *goquery.Selection) {
+		text := strings.TrimSpace(s.Text())
+		if text != "" {
+			results = append(results, text)
+		}
+
+		if src, exists := s.Attr("src"); exists {
+			results = append(results, src)
+		}
+
+		if href, exists := s.Attr("href"); exists {
+			results = append(results, href)
+		}
+	})
+
+	return strings.Join(results, "\n")
+}
+
+func checkRobotsTxt(targetURL string) bool {
+	parsedURL, err := url.Parse(targetURL)
+	if err != nil {
+		return false
+	}
+
+	robotsURL := fmt.Sprintf("%s://%s/robots.txt", parsedURL.Scheme, parsedURL.Host)
+	client := &http.Client{Timeout: 10 * time.Second}
+	req, _ := http.NewRequest("GET", robotsURL, nil)
+	req.Header.Set("User-Agent", userAgent)
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return true
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode == 404 {
+		return true
+	}
+
+	robotsData, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return true
+	}
+
+	robots, err := robotstxt.FromBytes(robotsData)
+	if err != nil {
+		return true
+	}
+
+	return robots.TestAgent(parsedURL.Path, userAgent)
+}
+
+func Start(database *sql.DB) {
+	go func() {
+		for {
+			jobs, err := db.GetPendingJobs(database)
+			if err != nil {
+				log.Printf("Error fetching jobs: %v", err)
+				time.Sleep(5 * time.Second)
+				continue
+			}
+
+			for _, job := range jobs {
+				log.Printf("Processing job %d: %s (selector: %s)", job.ID, job.URL, job.Selector)
+				start := time.Now()
+
+				content := ""
+				status := "ok"
+
+				if job.URL != "" {
+					if !checkRobotsTxt(job.URL) {
+						log.Printf("Job %d: Blocked by robots.txt", job.ID)
+						status = "blocked"
+					} else {
+						client := &http.Client{Timeout: 30 * time.Second}
+						req, err := http.NewRequest("GET", job.URL, nil)
+						if err != nil {
+							log.Printf("Job %d: Error creating request: %v", job.ID, err)
+							status = "error"
+						} else {
+							req.Header.Set("User-Agent", userAgent)
+
+							resp, err := client.Do(req)
+							if err != nil {
+								log.Printf("Job %d: Error fetching URL: %v", job.ID, err)
+								status = "error"
+							} else {
+								defer resp.Body.Close()
+
+								htmlBytes, err := io.ReadAll(resp.Body)
+								if err != nil {
+									log.Printf("Job %d: Error reading response: %v", job.ID, err)
+									status = "error"
+								} else {
+									rawHTML := string(htmlBytes)
+									log.Printf("Job %d: Saved HTML (%d bytes)", job.ID, len(rawHTML))
+
+									if err := db.UpdateJobHTML(database, job.ID, rawHTML); err != nil {
+										log.Printf("Job %d: Error updating HTML: %v", job.ID, err)
+									}
+
+									content = extractContent(bytes.NewReader(htmlBytes), job.Selector)
+									log.Printf("Job %d: Extracted content (%d chars)", job.ID, len(content))
+
+									if err := db.UpdateJobContent(database, job.ID, content); err != nil {
+										log.Printf("Job %d: Error updating content: %v", job.ID, err)
+									}
+								}
+							}
+						}
+					}
+				}
+
+				duration := time.Since(start)
+
+				if job.WebhookURL != "" {
+					payload := map[string]string{
+						"status":  status,
+						"took":    fmt.Sprintf("%.1fs", duration.Seconds()),
+						"url":     job.URL,
+						"content": content,
+					}
+					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.UpdateNextRun(database, job.ID, job.FrequencyMinutes); err != nil {
+					log.Printf("Error updating job %d: %v", job.ID, err)
+				} else {
+					if job.FrequencyMinutes > 0 {
+						log.Printf("Job %d completed, next run in %d minutes", job.ID, job.FrequencyMinutes)
+					} else {
+						log.Printf("Job %d completed", job.ID)
+					}
+				}
+			}
+
+			time.Sleep(5 * time.Second)
+		}
+	}()
+}