feat(log): added saving logs into file

README.md

@@ -12,9 +12,10 @@ in `/opt/komputer` directory.
 
 Bot is configurable via a few environment variables:
 
-- DISCORD_BOT_TOKEN= # Discord Bot Token (required)
-- APPLICATION_ID= # Your bot application id (required)
-- SERVER_GUID= # Your server ID, where bot will register commands (required)
-- MONGODB_URI= # URI to connect MongoDB database (required)
-- MONGODB_DB_NAME= # Name of main collection for komputer bot (required)
-- RAPID_API_KEY= # API key for RapidAPIs. In project is use: HumorAP (optional)
+- DISCORD_BOT_TOKEN= Discord Bot Token (required)
+- APPLICATION_ID= Your bot application id (required)
+- SERVER_GUID= Your server ID, where bot will register commands (required)
+- MONGODB_URI= URI to connect MongoDB database (required)
+- MONGODB_DB_NAME= Name of main collection for komputer bot (required)
+- RAPID_API_KEY= API key for RapidAPIs. In project is use: HumorAP (optional)
+- LOG_FILE = Localization of your log file (optional). If you don't use this variable, logs will print on STDOUT

cmd/komputer/main.go

@@ -93,6 +93,7 @@ func main() {
 	defer bot.Close()
 	defer schedule.Scheduler.Stop()
 	defer mongo.CloseDb()
+	defer log.FileLog.Close()
 
 	stop := make(chan os.Signal, 1)
 	signal.Notify(stop, os.Interrupt)

internal/log/log.go

@@ -2,12 +2,32 @@ package log
 
 import (
 	"context"
+	"fmt"
 	"github.com/rs/zerolog"
+	"io"
 	"os"
 )
 
-// TODO Add saving logs into file
-var logger = zerolog.New(os.Stdout).With().Ctx(context.Background()).Timestamp().Logger()
+var (
+	FileLog io.WriteCloser = os.Stdout
+)
+
+var logger zerolog.Logger
+
+func init() {
+	logFilePath := os.Getenv("LOG_FILE")
+	if logFilePath != "" {
+		var err error
+
+		FileLog, err = os.Open(logFilePath)
+		if err != nil {
+			Fatal(context.Background(), fmt.Sprintf("Failed to open file '%s'", logFilePath), err)
+			return
+		}
+	}
+
+	logger = zerolog.New(FileLog).With().Ctx(context.Background()).Timestamp().Logger()
+}
 
 func Info(ctx context.Context, msg string) {
 	logger.Info().Ctx(ctx).Str("traceID", getTraceID(ctx)).Msg(msg)