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

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)
+}