refactor timestamp reformatting

Author: mroote

src/api/handlers.go

@@ -4,8 +4,6 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"github.com/mroote/factorio-server-manager/bootstrap"
-	"github.com/mroote/factorio-server-manager/factorio"
 	"io"
 	"io/ioutil"
 	"log"
@@ -16,6 +14,9 @@ import (
 	"sync"
 	"time"
 
+	"github.com/mroote/factorio-server-manager/bootstrap"
+	"github.com/mroote/factorio-server-manager/factorio"
+
 	"github.com/gorilla/mux"
 )
 
@@ -216,7 +217,7 @@ func LogTail(w http.ResponseWriter, r *http.Request) {
 
 	w.Header().Set("Content-Type", "application/json;charset=UTF-8")
 	config := bootstrap.GetConfig()
-	resp, err = factorio.TailLog()
+	resp, err = factorio.TailLog(config.FactorioLog)
 	if err != nil {
 		resp = fmt.Sprintf("Could not tail %s: %s", config.FactorioLog, err)
 		return

src/factorio/gamelog.go

@@ -11,8 +11,9 @@ import (
 	"github.com/mroote/factorio-server-manager/bootstrap"
 )
 
-func tailLog(filename string) ([]string, error) {
-	result := []string{}
+func TailLog(filename string) ([]string, error) {
+	// Tail the Factorio game log file
+	var result []string
 
 	config := bootstrap.GetConfig()
 
@@ -46,7 +47,7 @@ func getOffset(line string) (string, error) {
 
 func getStartTime(line string) time.Time {
 	re, _ := regexp.Compile(`\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}`)
-	date := string(re.FindString(line))
+	date := re.FindString(line)
 	startTime, _ := time.Parse(time.RFC3339, strings.Replace(date, " ", "T", 1)+"Z")
 
 	return startTime
@@ -67,10 +68,10 @@ func replaceTimestampInLine(line string, offset string, startTime time.Time) str
 func reformatTimestamps(log []string) []string {
 	firstLine := log[0]
 	startTime := getStartTime(firstLine)
-	result := []string{}
+	var result []string
 
-	for i := range log {
-		line := strings.TrimLeft(log[i], " \t")
+	for _, line := range log {
+		line = strings.TrimLeft(line, " \t")
 		offset, _ := getOffset(line)
 		result = append(result, replaceTimestampInLine(line, offset, startTime))
 	}