feature: add logging to a file (#112)

* feature: add logging to a file

* refactor: move InitLog to util lib

* docs: update signal and management docs

* chore: update docker compose

* set --log-file to console

* chore: comment out log volume in docker compose

Co-authored-by: mlsmaycon <mlsmaycon@gmail.com>

util/log.go

@@ -0,0 +1,39 @@
+package util
+
+import (
+	log "github.com/sirupsen/logrus"
+	"gopkg.in/natefinch/lumberjack.v2"
+	"io"
+	"path/filepath"
+	"time"
+)
+
+// InitLog parses and sets log-level input
+func InitLog(logLevel string, logPath string) error {
+	level, err := log.ParseLevel(logLevel)
+	if err != nil {
+		log.Errorf("Failed parsing log-level %s: %s", logLevel, err)
+		return err
+	}
+
+	if logPath != "" && logPath != "console" {
+		lumberjackLogger := &lumberjack.Logger{
+			// Log file absolute path, os agnostic
+			Filename:   filepath.ToSlash(logPath),
+			MaxSize:    5, // MB
+			MaxBackups: 10,
+			MaxAge:     30, // days
+			Compress:   true,
+		}
+		log.SetOutput(io.Writer(lumberjackLogger))
+	}
+
+	logFormatter := new(log.TextFormatter)
+	logFormatter.TimestampFormat = time.RFC3339 // or RFC3339
+	logFormatter.FullTimestamp = true
+
+	log.SetFormatter(logFormatter)
+	log.SetLevel(level)
+
+	return nil
+}