From 966d962eeda716aa3eb71b9b1248b370530f52f0 Mon Sep 17 00:00:00 2001
From: Knut Ahlers <knut@ahlers.me>
Date: Fri, 8 Jun 2018 12:22:28 +0200
Subject: [PATCH] Initial version

---
 .gitignore |   1 +
 main.go    | 103 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 104 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 main.go

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a5adc5d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+terraria-docker
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..46d23d2
--- /dev/null
+++ b/main.go
@@ -0,0 +1,103 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"github.com/Luzifer/rconfig"
+	log "github.com/sirupsen/logrus"
+)
+
+var (
+	cfg = struct {
+		FiFoFile       string `flag:"fifo" default:"/home/gameserver/terraria_cmd" description:"Path to create the fifo at"`
+		LogLevel       string `flag:"log-level" default:"info" description:"Log level (debug, info, warn, error, fatal)"`
+		VersionAndExit bool   `flag:"version" default:"false" description:"Prints current version and exits"`
+	}{}
+
+	done = make(chan struct{}, 1)
+
+	version = "dev"
+)
+
+func init() {
+	if err := rconfig.ParseAndValidate(&cfg); err != nil {
+		log.Fatalf("Unable to parse commandline options: %s", err)
+	}
+
+	if cfg.VersionAndExit {
+		fmt.Printf("terraria-docker %s\n", version)
+		os.Exit(0)
+	}
+
+	if l, err := log.ParseLevel(cfg.LogLevel); err != nil {
+		log.WithError(err).Fatal("Unable to parse log level")
+	} else {
+		log.SetLevel(l)
+	}
+}
+
+func main() {
+	if err := syscall.Mkfifo(cfg.FiFoFile, 0644); err != nil {
+		log.WithError(err).Fatal("Unable to create fifo")
+	}
+	defer os.Remove(cfg.FiFoFile)
+
+	sigs := make(chan os.Signal, 1)
+	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
+	go handleSignal(sigs)
+
+	go inputLoop()
+
+	for {
+		select {
+		case <-done:
+			log.Info("Waiting 5s until quit")
+			<-time.After(5 * time.Second) // Allow some time for terraria to quit gracefully
+			return
+		}
+	}
+}
+
+func inputLoop() {
+	for {
+		f, err := os.Open(cfg.FiFoFile)
+		if err != nil {
+			log.WithError(err).Error("Unable to (re)open fifo, quitting now")
+			done <- struct{}{}
+			continue
+		}
+		defer f.Close()
+
+		scanner := bufio.NewScanner(f)
+		for scanner.Scan() {
+			fmt.Println(scanner.Text())
+			if scanner.Text() == "exit" {
+				done <- struct{}{}
+			}
+		}
+
+		switch scanner.Err() {
+		case nil:
+			// This is fine
+		case io.EOF:
+			// This is fine
+		default:
+			log.WithError(err).Error("Unable to read from fifo")
+			fmt.Println("exit")
+			done <- struct{}{}
+		}
+	}
+}
+
+func handleSignal(sigs chan os.Signal) {
+	sig := <-sigs
+	log.WithField("signal", sig).Info("Received terminating singal")
+	fmt.Println("exit")
+	done <- struct{}{}
+}