Made the service into a daemon that you can route IPC commands to

config.go

@@ -16,8 +16,11 @@ type AppConfig struct {
 	} `json:"storage"`
 
 	Daemon struct {
-		UseNixOs bool `json:"use_nixos"`
+		// UseNixOs      bool   `json:"use_nixos"`
+		ListenAddress string `json:"listen_address"`
 	}
+
+	Instances map[string]VsServerConfigOptions `json:"instances"`
 }
 
 func DefaultConfig() *AppConfig {
@@ -30,6 +33,10 @@ func DefaultConfig() *AppConfig {
 	cfg.Storage.BackupDir = filepath.Join(basePath, "backups")
 	cfg.Storage.ConfigTemplatesDir = filepath.Join(basePath, "config_templates")
 
+	cfg.Daemon.ListenAddress = "127.0.0.1:12345"
+
+	cfg.Instances = make(map[string]VsServerConfigOptions)
+
 	return cfg
 }
 

daemon.go

@@ -0,0 +1,178 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"os"
+	"os/signal"
+	"path/filepath"
+	"syscall"
+)
+
+type CommandPayload struct {
+	Command string `json:"command"`
+}
+
+type DaemonServer struct {
+	cfg         *AppConfig
+	procManager *ProcessManager
+}
+
+func StartDaemon(cfg *AppConfig) error {
+	ds := &DaemonServer{
+		cfg:         cfg,
+		procManager: NewProcessManager(),
+	}
+
+	mux := http.NewServeMux()
+	mux.HandleFunc("/instances/create", ds.handleCreate)
+	mux.HandleFunc("/instances/start", ds.handleStart)
+	mux.HandleFunc("/instances/stop", ds.handleStop)
+	mux.HandleFunc("/instances/command", ds.handleCommand)
+
+	server := &http.Server{
+		Addr:    cfg.Daemon.ListenAddress,
+		Handler: mux,
+	}
+
+	sigChan := make(chan os.Signal, 1)
+	signal.Notify(sigChan, os.Interrupt, syscall.SIGTERM)
+
+	go func() {
+		fmt.Printf("Engine daemon actively listening on http://%s\n", cfg.Daemon.ListenAddress)
+		if err := server.ListenAndServe(); err != http.ErrServerClosed {
+			fmt.Errorf("Daemon runtime failure: %v", err)
+		}
+	}()
+
+	<-sigChan
+	fmt.Println("\nShutting down supervisor daemon threads...")
+	return nil
+}
+
+func (ds *DaemonServer) handleCreate(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	name := r.URL.Query().Get("name")
+	version := r.URL.Query().Get("version")
+	if name == "" || version == "" {
+		http.Error(w, "Missing name or version parameters", http.StatusBadRequest)
+		return
+	}
+
+	if _, exists := ds.cfg.Instances[name]; exists {
+		http.Error(w, fmt.Sprintf("Instance '%s' already exists in configuration", name), http.StatusConflict)
+		return
+	}
+
+	options := VsServerConfigOptions{
+		Version:    version,
+		ServerName: name,
+		Port:       42424, // Pull from custom parameters later if desired
+		MaxClients: 10,
+	}
+
+	err := DownloadAndExtractServer(version, ds.cfg.Storage.InstallDir)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Installation failed: %v", err), http.StatusInternalServerError)
+		return
+	}
+
+	err = CreateNewInstance(name, version, options, ds.cfg)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Instance provisioning failed: %v", err), http.StatusInternalServerError)
+		return
+	}
+
+	ds.cfg.Instances[name] = options
+
+	home, _ := os.UserHomeDir()
+	configPath := filepath.Join(home, ".config", "vs-manager", "config.json")
+	data, _ := json.MarshalIndent(ds.cfg, "", "  ")
+	_ = os.WriteFile(configPath, data, 0644)
+
+	w.WriteHeader(http.StatusCreated)
+	fmt.Fprintf(w, "Successfully created and stored profile for instance %s", name)
+}
+
+func (ds *DaemonServer) handleStart(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	name := r.URL.Query().Get("name")
+	if name == "" {
+		http.Error(w, "Missing name parameter", http.StatusBadRequest)
+		return
+	}
+
+	options, exists := ds.cfg.Instances[name]
+	if !exists {
+		http.Error(w, fmt.Sprintf("Instance '%s' does not exist. Run 'create' first", name), http.StatusNotFound)
+		return
+	}
+
+	err := ds.procManager.StartInstance(name, options.Version, options, ds.cfg)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Process startup failed: %v", err), http.StatusInternalServerError)
+		return
+	}
+
+	w.WriteHeader(http.StatusOK)
+	fmt.Fprintf(w, "Successfully started instance %s", name)
+}
+
+func (ds *DaemonServer) handleStop(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	name := r.URL.Query().Get("name")
+	if name == "" {
+		http.Error(w, "Missing name parameter", http.StatusBadRequest)
+		return
+	}
+
+	err := ds.procManager.SendCommand(name, "/stop")
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Failed to dispatch stop command: %v", err), http.StatusInternalServerError)
+		return
+	}
+
+	w.WriteHeader(http.StatusOK)
+	fmt.Fprintf(w, "Termination signal routed to instance %s", name)
+}
+
+func (ds *DaemonServer) handleCommand(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	name := r.URL.Query().Get("name")
+	if name == "" {
+		http.Error(w, "Missing name parameter", http.StatusBadRequest)
+		return
+	}
+
+	var payload CommandPayload
+	if err := json.NewDecoder(r.Body).Decode(&payload); err != nil {
+		http.Error(w, "Malformed JSON body", http.StatusBadRequest)
+		return
+	}
+
+	err := ds.procManager.SendCommand(name, payload.Command)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Command delivery failed: %v", err), http.StatusInternalServerError)
+		return
+	}
+
+	w.WriteHeader(http.StatusOK)
+	fmt.Fprintf(w, "Command delivered successfully to %s", name)
+}

instance_config.go

@@ -10,6 +10,7 @@ import (
 )
 
 type VsServerConfigOptions struct {
+	Version         string `json:"Version"`
 	ServerName      string `json:"ServerName"`
 	Port            int    `json:"Port"`
 	IpAddress       string `json:"IpAddress"`
@@ -20,29 +21,6 @@ type VsServerConfigOptions struct {
 	PreApprovedRole string `json:"PreApprovedRole"`
 }
 
-// func WriteInstanceConfig(instanceDir string, settings VsServerConfig) error {
-// 	configPath := filepath.Join(instanceDir, "serverconfig.json")
-
-// 	if settings.IpAddress == "" {
-// 		settings.IpAddress = "0.0.0.0"
-// 	}
-// 	if settings.MaxClients == 0 {
-// 		settings.MaxClients = 16
-// 	}
-
-// 	data, err := json.MarshalIndent(settings, "", "  ")
-// 	if err != nil {
-// 		return fmt.Errorf("failed to marshal server configuration: %w", err)
-// 	}
-
-// 	err = os.WriteFile(configPath, data, 0644)
-// 	if err != nil {
-// 		return fmt.Errorf("failed writing serverconfig.json to instance: %w", err)
-// 	}
-
-// 	return nil
-// }
-
 func PrepareInstanceConfig(templateVersion string, instanceConfigPath string, config VsServerConfigOptions, cfg *AppConfig) error {
 	templatePath := filepath.Join(cfg.Storage.ConfigTemplatesDir, templateVersion, "serverconfig.json")
 

main.go

@@ -1,65 +1,112 @@
 package main
 
 import (
+	"bytes"
+	"encoding/json"
 	"fmt"
+	"io"
 	"log"
+	"net/http"
+	"net/url"
 	"os"
-	"os/signal"
 	"path/filepath"
-	"syscall"
 )
 
 func main() {
-	fmt.Println("Initializing VS server manager...")
-
 	home, err := os.UserHomeDir()
 	if err != nil {
-		log.Fatalf("Could not locate user home dir")
+		log.Fatalf("Could not locate user home dir: %v", err)
 	}
 
 	configPath := filepath.Join(home, ".config", "vs-manager", "config.json")
-
 	cfg, err := LoadOrCreateConfig(configPath)
 	if err != nil {
 		log.Fatalf("Initialization failed: %v", err)
 	}
 
-	instanceName := "sample_server"
-	targetVersion := "1.22.3"
-
-	options := VsServerConfigOptions{
-		ServerName: "Sample Server",
-		Port:       4000,
-		MaxClients: 100,
-		Password:   "",
+	if len(os.Args) < 2 {
+		printUsage()
+		return
 	}
 
-	err = DownloadAndExtractServer(targetVersion, cfg.Storage.InstallDir)
-	if err != nil {
-		log.Fatalf("Downloader module encountered an error: %v", err)
+	subCommand := os.Args[1]
+
+	switch subCommand {
+	case "daemon":
+		fmt.Println("Initializing VS server manager background supervisor...")
+		if err := StartDaemon(cfg); err != nil {
+			log.Fatalf("Daemon runtime fatal error: %v", err)
 		}
 
-	err = CreateNewInstance(instanceName, targetVersion, options, cfg)
-	if err != nil {
-		log.Fatalf("Initialization abort: %v", err)
+	case "create":
+		if len(os.Args) < 4 {
+			log.Fatalf("Usage: go run . create <instance_name> <version>")
 		}
+		name := os.Args[2]
+		version := os.Args[3]
+		sendIPCRequest(cfg, "POST", fmt.Sprintf("/instances/create?name=%s&version=%s", url.QueryEscape(name), url.QueryEscape(version)), nil)
 
-	procManager := NewProcessManager()
-
-	fmt.Printf("\n⚡ Launching Instance: %s (v%s)\n", instanceName, targetVersion)
-	err = procManager.StartInstance(instanceName, targetVersion, options, cfg)
-	if err != nil {
-		log.Fatalf("Process startup failed: %v", err)
+	case "start":
+		if len(os.Args) < 3 {
+			log.Fatalf("Usage: go run . start <instance_name>")
 		}
+		name := os.Args[2]
+		sendIPCRequest(cfg, "POST", fmt.Sprintf("/instances/start?name=%s", url.QueryEscape(name)), nil)
 
-	sigChan := make(chan os.Signal, 1)
-	signal.Notify(sigChan, os.Interrupt, syscall.SIGTERM)
+	case "stop":
+		if len(os.Args) < 3 {
+			log.Fatalf("Usage: go run . stop <instance_name>")
+		}
+		name := os.Args[2]
+		sendIPCRequest(cfg, "POST", fmt.Sprintf("/instances/stop?name=%s", url.QueryEscape(name)), nil)
 
-	fmt.Println("\nServer running. Press Ctrl+C to cleanly shut down...")
-	<-sigChan
+	case "cmd":
+		if len(os.Args) < 4 {
+			log.Fatalf("Usage: go run . cmd <instance_name> \"<server command>\"")
+		}
+		name := os.Args[2]
+		serverCmd := os.Args[3]
 
-	fmt.Println("\n\nTriggering graceful server termination sequence...")
-	_ = procManager.SendCommand(instanceName, "stop")
+		payload := CommandPayload{Command: serverCmd}
+		body, _ := json.Marshal(payload)
+		sendIPCRequest(cfg, "POST", fmt.Sprintf("/instances/command?name=%s", url.QueryEscape(name)), bytes.NewBuffer(body))
 
-	fmt.Println("Manager exited successfully.")
+	default:
+		printUsage()
+	}
+}
+
+func sendIPCRequest(cfg *AppConfig, method string, path string, body io.Reader) {
+	targetUrl := fmt.Sprintf("http://%s%s", cfg.Daemon.ListenAddress, path)
+	req, err := http.NewRequest(method, targetUrl, body)
+	if err != nil {
+		log.Fatalf("Failed to construct IPC frame: %v", err)
+	}
+
+	if body != nil {
+		req.Header.Set("Content-Type", "application/json")
+	}
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		log.Fatalf("IPC connection failed. Is the vs-manager daemon running? Error: %v", err)
+	}
+	defer resp.Body.Close()
+
+	respBody, _ := io.ReadAll(resp.Body)
+	if resp.StatusCode != http.StatusOK {
+		log.Fatalf("Error from daemon: %s", string(respBody))
+	}
+
+	fmt.Println(string(respBody))
+}
+
+func printUsage() {
+	fmt.Println("Vintage Story Server Manager")
+	fmt.Println("\nUsage:")
+	fmt.Println("  go run . daemon                      Starts the background process supervisor")
+	fmt.Println("  go run . create <name> <version>     Provisions baseline configuration and stores instance profile")
+	fmt.Println("  go run . start <name>                Launches an existing server instance using stored profile")
+	fmt.Println("  go run . stop <name>                 Gracefully shuts down a server instance")
+	fmt.Println("  go run . cmd <name> \"<command>\"     Dispatches a terminal console command down the pipe")
 }

process.go

@@ -7,6 +7,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"strings"
 	"sync"
 )
 
@@ -107,6 +108,10 @@ func (pm *ProcessManager) SendCommand(name string, command string) error {
 		return fmt.Errorf("Cannot send command, instance with name '%s' is not running", name)
 	}
 
+	if command != "" && !strings.HasPrefix(command, "/") {
+		command = "/" + command
+	}
+
 	_, err := io.WriteString(pipe, command+"\n")
 	if err != nil {
 		return fmt.Errorf("failed writing to server process stdin conduit: %w", err)