Recursive approach with message passing through channels

config.json

@@ -9,7 +9,7 @@
 			"repo": "linux"
 		}
 	],
-	"interval": 5,
+	"interval": 1200,
 	"ntfy_topic": "hee4waeNguch"
 }
 

src/main.go

@@ -2,9 +2,43 @@ package main
 
 import (
 	"log"
+	"math/rand"
 	"time"
 )
 
+type RepoUpdate struct {
+	repo RepoConfig
+	Tag  string
+}
+
+func notifierThread(c chan RepoUpdate, n Notifier) {
+	update := <-c
+	log.Printf("New tag stored for %s: %s", update.repo.Repo, update.Tag)
+	if n.Notify(update.repo, update.Tag) {
+		log.Printf("Notified for %s/%s: %s", update.repo.Owner, update.repo.Repo, update.Tag)
+	}
+	notifierThread(c, n)
+}
+
+func repoThread(c chan RepoUpdate, repo RepoConfig, avgInterval int, db Db) {
+	log.Println("Checking", repo.Repo)
+	tag, err := repo.GetLatestTag()
+	isNewVersion, err_2 := db.CheckAndStore(repo.Owner, repo.Repo)
+
+	if err != nil {
+		log.Printf("Failed to fetch latest tag for %s: %v", repo.Repo, err)
+	} else if err_2 != nil {
+		log.Printf("Failed to store latest tag for %s: %v", repo.Repo, err_2)
+	} else if isNewVersion {
+		c <- RepoUpdate{repo, tag.Name}
+	}
+
+	sleepTime := time.Duration(rand.Intn(avgInterval)) * time.Second
+	time.Sleep(sleepTime)
+
+	repoThread(c, repo, avgInterval, db)
+}
+
 func main() {
 	// Load configuration
 	config, err := loadConfig("config.json")
@@ -20,32 +54,12 @@ func main() {
 
 	notifier := NtfyNotifier{Topic: config.NtfyTopic}
 
-	// Main loop
+	c := make(chan RepoUpdate)
-	for {
+
+	// Spawn a goroutine for each repository
 	for _, repo := range config.Repos {
-			tag, err := repo.GetLatestTag()
+		go repoThread(c, repo, config.Interval, db)
-			if err != nil {
-				log.Printf("Failed to get latest tag for %s: %v", repo.Repo, err)
-				continue
-			}
-			if tag.Name == "" {
-				log.Printf("No tags found for %s", repo.Repo)
-				continue
 	}
 
-			// Check and store tag
+	notifierThread(c, notifier)
-			stored, err := db.CheckAndStore(repo.Repo, tag.Name)
-			if err != nil {
-				log.Printf("Failed to store tag for %s: %v", repo.Repo, err)
-				continue
-			}
-			if stored {
-				log.Printf("New tag stored for %s: %s", repo.Repo, tag.Name)
-				if notifier.Notify(repo, tag.Name) {
-					log.Printf("Notified for %s/%s: %s", repo.Owner, repo.Repo, tag.Name)
-				}
-			}
-		}
-		time.Sleep(time.Duration(config.Interval) * time.Second)
-	}
 }