supports more env variables

.env.example

@@ -1,15 +1,23 @@
-BOT_API_URL=https://api.telegram.org
+# database
-BOT_TOKEN=12345678:ABC-DEF1234ghIkl-zyx57W2P0s
-
 DB_HOST=localhost
 DB_PORT=3306
 DB_NAME=govd
 DB_USER=govd
 DB_PASSWORD=password
 
-REPO_URL=https://github.com/govdbot/govd
+# gotgbot
+BOT_API_URL=https://api.telegram.org
+BOT_TOKEN=12345678:ABC-DEF1234ghIkl-zyx57W2P0s
+CONCURRENT_UPDATES=-1
+LOG_ERRORS=0
+
+# downloads
+DOWNLOADS_DIR=downloads
 
 # proxy
 HTTP_PROXY=
 HTTPS_PROXY=
 NO_PROXY=
+
+# misc
+REPO_URL=https://github.com/govdbot/govd

bot/main.go

@@ -3,6 +3,7 @@ package bot
 import (
 	"log"
 	"os"
+	"strconv"
 	"time"
 
 	botHandlers "govd/bot/handlers"
@@ -33,12 +34,29 @@ func Start() {
 	if err != nil {
 		log.Fatalf("failed to create bot: %v", err)
 	}
+	concurrentUpdates, err := strconv.Atoi(os.Getenv("CONCURRENT_UPDATES"))
+	if err != nil {
+		log.Println("failed to parse CONCURRENT_UPDATES env, using 50")
+		concurrentUpdates = 50
+	}
+	logDispatcherErrors, err := strconv.ParseBool(os.Getenv("LOG_DISPATCHER_ERRORS"))
+	if err != nil {
+		log.Println("failed to parse LOG_ERRORS env, using false")
+		logDispatcherErrors = false
+	}
 	dispatcher := ext.NewDispatcher(&ext.DispatcherOpts{
 		Error: func(b *gotgbot.Bot, ctx *ext.Context, err error) ext.DispatcherAction {
-			// log.Println("an error occurred while handling update:", err.Error())
+			if logDispatcherErrors {
+				log.Printf("an error occurred while handling update: %v", err)
+			}
 			return ext.DispatcherActionNoop
 		},
-		MaxRoutines: 500,
+		Panic: func(b *gotgbot.Bot, ctx *ext.Context, r interface{}) {
+			if logDispatcherErrors {
+				log.Printf("panic occurred while handling update: %v", r)
+			}
+		},
+		MaxRoutines: concurrentUpdates,
 	})
 	updater := ext.NewUpdater(dispatcher, nil)
 	registerHandlers(dispatcher)

util/download.go

@@ -21,11 +21,15 @@ import (
 )
 
 func DefaultConfig() *models.DownloadConfig {
+	downloadsDir := os.Getenv("DOWNLOADS_DIR")
+	if downloadsDir == "" {
+		downloadsDir = "downloads"
+	}
 	return &models.DownloadConfig{
 		ChunkSize:     10 * 1024 * 1024, // 10MB
 		Concurrency:   4,
 		Timeout:       30 * time.Second,
-		DownloadDir:   "downloads",
+		DownloadDir:   downloadsDir,
 		RetryAttempts: 3,
 		RetryDelay:    2 * time.Second,
 		Remux:         true,