Merge pull request 'Merge dev into master' (#1) from dev into master

Reviewed-on: #1

.gitignore

@@ -2,3 +2,5 @@
 .direnv
 .cache
 .vscode
+vssm
+test/

README.md

@@ -0,0 +1,63 @@
+# VSSM (VintageStory Server Manager)
+*A server manager for VintageStory*
+
+## IMPORTANT INFORMATION
+This project is currently in development, and thus everything is subject to change
+
+## About
+VSSM allows you to create and manage multiple VS servers 
+
+## Installation and Usage
+There are no binaries just yet, so you have to download the source files.
+
+Setup is easy from source, all you need is:
+- Linux
+- Go
+- .NET 10 Runtime
+
+**If you are using NixOS, a flake.nix is provided, just run `nix develop` for a full development enviroment**
+
+- Once you have the source code downloaded or cloned, you can run `go build` to generate an executable.
+- Run `./vssm daemon` to start the daemon - *(For now, theres no background service created by default, but you can run it in the background with `vssm daemon &` and kill the process with `pkill vssm`)*
+- Run `./vssm` with no arguments to show usage
+
+## Configuration
+**For now, the configuration file is stored in `~/.config/vssm/config.json`, but this will be configurable later.**
+
+## Web Interface
+Alongside this project, I am developing a seperate web-based dashboard that can be used to manage you servers with a very simple UI. You can get it [here](https://git.bellsworne.tech/chrisbell/vssm_web).
+
+## Roadmap
+
+- [ ] Configuration
+    - [x] Custom configuration path (passed to the daemon with a flag `--config`)
+        - [x] Daemon instance remembers config path (*so you don't have to pass `--config` everytime you run an ipc command*)
+    - [ ] Daemon listen port (kind of implemented, could be cleaner)
+    - [x] Declarative Server configuration (Create servers in config)
+        - [x] All configuration options
+
+- [ ] Server management
+    - [x] Create servers
+        - [x] Automatic server binary downloading by version
+    - [x] Delete servers
+    - [x] Start/Stop servers
+    - [x] Server configuration
+        - [x] Download correct configuration template for version (see availible templates [here](https://git.bellsworne.tech/chrisbell/vssm_config_templates))
+        - [x] Version
+        - [x] Server Name
+        - [x] Port
+        - [x] Full declarative configuration support in main app config
+    - [x] Multiple servers support
+    - [x] List servers and their status
+    - [x] Send commands to servers
+    - [ ] Automated server backups
+
+- [ ] Binary releases
+
+- [ ] Automatically set up background service
+
+- [ ] Other
+    - [ ] First class NixOS support
+        - [x] Patch downloaded server binaries for NixOS
+        - [ ] Official nix package or flake
+            - [ ] All configuration options

config.go

@@ -9,6 +9,7 @@ import (
 
 type AppConfig struct {
 	Storage struct {
+		AppDataDir         string `json:"app_data_dir"`
 		InstallDir         string `json:"install_dir"`
 		InstancesDir       string `json:"instances_dir"`
 		BackupDir          string `json:"backup_dir"`
@@ -16,13 +17,15 @@ type AppConfig struct {
 	} `json:"storage"`
 
 	Daemon struct {
-		UseNixOs bool `json:"use_nixos"`
-	}
+		ListenAddress string `json:"listen_address"`
+		Port          int    `json:"port"`
+	} `json:"daemon"`
+
+	Instances map[string]InstanceMetadata `json:"instances"`
 }
 
-func DefaultConfig() *AppConfig {
-	home, _ := os.UserHomeDir()
-	basePath := filepath.Join(home, ".local", "share", "vs-manager")
+func CreateConfigWithDefaults(configPath string) *AppConfig {
+	basePath := filepath.Join(filepath.Dir(configPath), "vssm_data")
 
 	cfg := &AppConfig{}
 	cfg.Storage.InstallDir = filepath.Join(basePath, "installs")
@@ -30,12 +33,17 @@ 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"
+	cfg.Daemon.Port = 65000
+
+	cfg.Instances = make(map[string]InstanceMetadata)
+
 	return cfg
 }
 
 func LoadOrCreateConfig(configPath string) (*AppConfig, error) {
 	if _, err := os.Stat(configPath); os.IsNotExist(err) {
-		cfg := DefaultConfig()
+		cfg := CreateConfigWithDefaults(configPath)
 
 		if err := os.MkdirAll(filepath.Dir(configPath), 0755); err != nil {
 			return nil, fmt.Errorf("Failed to create config directory: %w", err)

daemon.go

@@ -0,0 +1,465 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"os"
+	"os/signal"
+	"path/filepath"
+	"strconv"
+	"sync"
+	"syscall"
+	"time"
+)
+
+type CommandPayload struct {
+	Command string `json:"command"`
+}
+
+type InstanceStatusResponse struct {
+	Name    string `json:"name"`
+	Version string `json:"version"`
+	Port    int    `json:"port"`
+	Status  string `json:"status"`
+}
+
+type DaemonServer struct {
+	sync.RWMutex
+	cfg         *AppConfig
+	configPath  string
+	procManager *ProcessManager
+}
+
+func StartDaemon(cfg *AppConfig, configPath string) error {
+	ds := &DaemonServer{
+		cfg:         cfg,
+		configPath:  configPath,
+		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)
+	mux.HandleFunc("/instances/list", ds.handleList)
+	mux.HandleFunc("/instances/logs", ds.handleGetLogs)
+	mux.HandleFunc("/instances/delete", ds.handleDelete)
+
+	corsWrappedHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Access-Control-Allow-Origin", "*")
+		w.Header().Set("Access-Control-Allow-Methods", "POST, GET, OPTIONS")
+		w.Header().Set("Access-Control-Allow-Headers", "Content-Type")
+
+		if r.Method == http.MethodOptions {
+			w.WriteHeader(http.StatusOK)
+			return
+		}
+
+		mux.ServeHTTP(w, r)
+	})
+
+	listenAddress := cfg.Daemon.ListenAddress + ":" + strconv.Itoa(cfg.Daemon.Port)
+
+	server := &http.Server{
+		Addr:    listenAddress,
+		Handler: corsWrappedHandler,
+	}
+
+	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", listenAddress)
+		if err := server.ListenAndServe(); err != http.ErrServerClosed {
+			fmt.Printf("Daemon runtime failure: %v\n", err)
+		}
+	}()
+
+	<-sigChan
+	fmt.Println("\n[Daemon] Shutdown signal caught! Initializing graceful teardown sequence...")
+
+	_ = server.Close()
+	ds.shutdownAllRunningServers()
+
+	fmt.Println("[Daemon] All threads gracefully shut down. Exiting supervisor cleanly.")
+	return nil
+}
+
+func (ds *DaemonServer) reloadConfig() error {
+	cfg, err := LoadOrCreateConfig(ds.configPath)
+	if err != nil {
+		fmt.Printf("Could not reload configuration file: %v\n", err)
+		return err
+	}
+
+	ds.Lock()
+	defer ds.Unlock()
+	ds.cfg = cfg
+	return nil
+}
+
+func (ds *DaemonServer) shutdownAllRunningServers() {
+	ds.procManager.Lock()
+
+	var activeNames []string
+	for name := range ds.procManager.ActiveInstances {
+		activeNames = append(activeNames, name)
+	}
+	ds.procManager.Unlock()
+
+	if len(activeNames) == 0 {
+		fmt.Println("[Daemon] No active server instances to tear down.")
+		return
+	}
+
+	fmt.Printf("[Daemon] Flushing stop instructions to %d running instance(s)...\n", len(activeNames))
+
+	var wg sync.WaitGroup
+	for _, name := range activeNames {
+		wg.Add(1)
+		go func(instanceName string) {
+			defer wg.Done()
+
+			fmt.Printf("[Daemon] Sending graceful /stop to instance '%s'...\n", instanceName)
+			err := ds.procManager.SendCommand(instanceName, "/stop")
+			if err != nil {
+				fmt.Printf("[Daemon Error] Could not send stop to %s: %v\n", instanceName, err)
+				return
+			}
+
+			ticker := time.NewTicker(250 * time.Millisecond)
+			defer ticker.Stop()
+			timeout := time.After(15 * time.Second)
+
+			for {
+				select {
+				case <-ticker.C:
+					ds.procManager.RLock()
+					_, running := ds.procManager.ActiveInstances[instanceName]
+					ds.procManager.RUnlock()
+
+					if !running {
+						fmt.Printf("[Daemon] Instance '%s' has successfully exited.\n", instanceName)
+						return
+					}
+				case <-timeout:
+					fmt.Printf("[Daemon Warning] Instance '%s' timed out while trying to stop safely.\n", instanceName)
+					return
+				}
+			}
+		}(name)
+	}
+
+	wg.Wait()
+}
+
+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")
+	port := r.URL.Query().Get("port")
+	if name == "" || version == "" || port == "" {
+		http.Error(w, "Missing name, version, or port parameters", http.StatusBadRequest)
+		return
+	}
+
+	converted_port, err := strconv.Atoi(port)
+	if err != nil {
+		http.Error(w, "Could not convert provided port to a valid port number", http.StatusBadRequest)
+		return
+	}
+
+	if ds.reloadConfig() != nil {
+		http.Error(w, "Could not reload config", http.StatusInternalServerError)
+		return
+	}
+
+	ds.Lock()
+	defer ds.Unlock()
+
+	if _, exists := ds.cfg.Instances[name]; exists {
+		http.Error(w, fmt.Sprintf("Instance '%s' already exists in configuration", name), http.StatusConflict)
+		return
+	}
+
+	for name, options := range ds.cfg.Instances {
+		if options.Port == converted_port {
+			http.Error(w, fmt.Sprintf("Port already occupied by instance '%s'", name), http.StatusConflict)
+			return
+		}
+	}
+
+	metadata := InstanceMetadata{
+		Version:    version,
+		ServerName: name,
+		Port:       converted_port,
+	}
+
+	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, metadata, ds.cfg)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Instance provisioning failed: %v", err), http.StatusInternalServerError)
+		return
+	}
+
+	ds.cfg.Instances[name] = metadata
+
+	data, err := json.MarshalIndent(ds.cfg, "", "  ")
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Failed processing profile adjustments: %v", err), http.StatusInternalServerError)
+		return
+	}
+
+	if err := os.WriteFile(ds.configPath, data, 0644); err != nil {
+		http.Error(w, fmt.Sprintf("Failed saving configuration adjustments to disk: %v", err), http.StatusInternalServerError)
+		return
+	}
+
+	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
+	}
+
+	if ds.reloadConfig() != nil {
+		http.Error(w, "Could not reload config", http.StatusInternalServerError)
+		return
+	}
+
+	ds.RLock()
+	defer ds.RUnlock()
+
+	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
+	}
+
+	instanceConfigPath := filepath.Join(ds.cfg.Storage.InstancesDir, name, "serverconfig.json")
+	err := SyncInstanceConfig(options.Version, instanceConfigPath, options, ds.cfg)
+	if err != nil {
+		http.Error(w, "Failed to sync config: "+err.Error(), http.StatusInternalServerError)
+		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)
+}
+
+func (ds *DaemonServer) handleList(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	if ds.reloadConfig() != nil {
+		http.Error(w, "Could not reload config", http.StatusInternalServerError)
+		return
+	}
+
+	ds.RLock()
+	defer ds.RUnlock()
+
+	ds.procManager.RLock()
+	defer ds.procManager.RUnlock()
+
+	var responseList []InstanceStatusResponse
+
+	for name, options := range ds.cfg.Instances {
+		status := "STOPPED"
+		if _, running := ds.procManager.ActiveInstances[name]; running {
+			status = "RUNNING"
+		}
+
+		responseList = append(responseList, InstanceStatusResponse{
+			Name:    name,
+			Version: options.Version,
+			Port:    options.Port,
+			Status:  status,
+		})
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode(responseList)
+}
+
+func (ds *DaemonServer) handleGetLogs(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet {
+		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
+	}
+
+	ds.procManager.RLock()
+	buf, exists := ds.procManager.LogBuffers[name]
+	ds.procManager.RUnlock()
+
+	if !exists || buf == nil {
+		w.Header().Set("Content-Type", "application/json")
+		w.Write([]byte("[]"))
+		return
+	}
+
+	logLines := buf.GetSnapshot()
+
+	w.Header().Set("Content-Type", "application/json")
+	if err := json.NewEncoder(w).Encode(logLines); err != nil {
+		http.Error(w, fmt.Sprintf("Failed encoding log matrix: %v", err), http.StatusInternalServerError)
+	}
+}
+
+func (ds *DaemonServer) handleDelete(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
+	}
+
+	purge := false
+	purgeParam := r.URL.Query().Get("purge")
+	if purgeParam != "" {
+		result, err := strconv.ParseBool(purgeParam)
+		if err != nil {
+			http.Error(w, "Invalid value for 'purge' parameter", http.StatusBadRequest)
+			return
+		}
+		purge = result
+	}
+
+	if ds.reloadConfig() != nil {
+		http.Error(w, "Could not reload config", http.StatusInternalServerError)
+		return
+	}
+
+	ds.Lock()
+	defer ds.Unlock()
+
+	ds.procManager.RLock()
+	defer ds.procManager.RUnlock()
+
+	_, exists := ds.cfg.Instances[name]
+	if !exists {
+		http.Error(w, fmt.Sprintf("Cannot delete instance '%s'; Does not exist.", name), http.StatusBadRequest)
+		return
+	}
+
+	if _, running := ds.procManager.ActiveInstances[name]; running {
+		http.Error(w, fmt.Sprintf("Cannot delete instance '%s'; It is currently running.", name), http.StatusBadRequest)
+		return
+	}
+
+	delete(ds.cfg.Instances, name)
+
+	data, err := json.MarshalIndent(ds.cfg, "", "  ")
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Failed processing profile adjustments: %v", err), http.StatusInternalServerError)
+		return
+	}
+
+	if err := os.WriteFile(ds.configPath, data, 0644); err != nil {
+		http.Error(w, fmt.Sprintf("Failed saving configuration adjustments to disk: %v", err), http.StatusInternalServerError)
+		return
+	}
+
+	if purge {
+		path := filepath.Join(ds.cfg.Storage.InstancesDir, name)
+		err := os.RemoveAll(path)
+		if err != nil {
+			http.Error(w, fmt.Sprintf("Failed to delete instance from disk: %v", err), http.StatusInternalServerError)
+			return
+		}
+	}
+
+	w.WriteHeader(http.StatusOK)
+	fmt.Fprintf(w, "Successfully deleted instance %s", name)
+
+}

go.mod

@@ -1,3 +1,3 @@
-module vs-manager
+module vssm
 
 go 1.26.3

instance.go

@@ -3,7 +3,6 @@ package main
 import (
 	"fmt"
 	"os"
-	"os/exec"
 	"path/filepath"
 )
 
@@ -14,17 +13,7 @@ const (
 	StateRunning InstanceState = "RUNNING"
 )
 
-type ManagedInstance struct {
-	Name    string        `json:"name"`
-	Version string        `json:"version"`
-	Port    int           `json:"port"`
-	Status  InstanceState `json:"status"`
-
-	Cmd   *exec.Cmd   `json:"-"`
-	Stdin interface{} `json:"-"`
-}
-
-func CreateNewInstance(name string, version string, options VsServerConfigOptions, cfg *AppConfig) error {
+func CreateNewInstance(name string, version string, meta InstanceMetadata, cfg *AppConfig) error {
 	instanceDir := filepath.Join(cfg.Storage.InstancesDir, name)
 
 	dirs := []string{
@@ -40,7 +29,7 @@ func CreateNewInstance(name string, version string, options VsServerConfigOption
 	}
 
 	instanceConfigPath := filepath.Join(instanceDir, "serverconfig.json")
-	if err := PrepareInstanceConfig(version, instanceConfigPath, options, cfg); err != nil {
+	if err := PrepareInstanceConfig(version, instanceConfigPath, meta, cfg); err != nil {
 		return fmt.Errorf("Failed provisioning server baseline configuration: %w", err)
 	}
 

instance_config.go

@@ -4,77 +4,56 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
+	"net/http"
 	"os"
 	"path/filepath"
 	"strings"
 )
 
-type VsServerConfigOptions struct {
-	ServerName      string `json:"ServerName"`
-	Port            int    `json:"Port"`
-	IpAddress       string `json:"IpAddress"`
-	MaxClients      int    `json:"MaxClients"`
-	Password        string `json:"Password"`
-	DefaultRole     string `json:"DefaultRole"`
-	GuestRole       string `json:"GuestRole"`
-	PreApprovedRole string `json:"PreApprovedRole"`
+type InstanceMetadata struct {
+	Version    string                 `json:"Version"`
+	ServerName string                 `json:"ServerName"`
+	Port       int                    `json:"Port"`
+	Config     map[string]interface{} `json:"config"`
 }
 
-// func WriteInstanceConfig(instanceDir string, settings VsServerConfig) error {
-// 	configPath := filepath.Join(instanceDir, "serverconfig.json")
+func PrepareInstanceConfig(templateVersion string, instanceConfigPath string, meta InstanceMetadata, cfg *AppConfig) error {
+	return SyncInstanceConfig(templateVersion, instanceConfigPath, meta, cfg)
+}
 
-// 	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 {
+func SyncInstanceConfig(templateVersion string, instanceConfigPath string, meta InstanceMetadata, cfg *AppConfig) error {
 	templatePath := filepath.Join(cfg.Storage.ConfigTemplatesDir, templateVersion, "serverconfig.json")
 
-	if _, err := os.Stat(instanceConfigPath); err == nil {
-		return nil
+	if err := ensureTemplateExists(templateVersion, templatePath, cfg); err != nil {
+		return fmt.Errorf("failed ensuring configuration template availability: %w", err)
 	}
 
-	if err := os.MkdirAll(filepath.Dir(instanceConfigPath), 0755); err != nil {
-		return fmt.Errorf("failed creating instance directory tree: %w", err)
-	}
+	if _, err := os.Stat(instanceConfigPath); os.IsNotExist(err) {
+		if err := os.MkdirAll(filepath.Dir(instanceConfigPath), 0755); err != nil {
+			return fmt.Errorf("failed creating instance directory tree: %w", err)
+		}
 
-	source, err := os.Open(templatePath)
-	if err != nil {
-		return fmt.Errorf("failed opening baseline template file: %w", err)
-	}
-	defer source.Close()
+		source, err := os.Open(templatePath)
+		if err != nil {
+			return fmt.Errorf("failed opening baseline template file: %w", err)
+		}
+		defer source.Close()
 
-	destination, err := os.Create(instanceConfigPath)
-	if err != nil {
-		return fmt.Errorf("failed creating target instance configuration: %w", err)
-	}
-	defer destination.Close()
+		destination, err := os.Create(instanceConfigPath)
+		if err != nil {
+			return fmt.Errorf("failed creating target instance configuration: %w", err)
+		}
 
-	if _, err := io.Copy(destination, source); err != nil {
-		return fmt.Errorf("failed cloning configuration template payload: %w", err)
+		_, err = io.Copy(destination, source)
+		destination.Close()
+		if err != nil {
+			return fmt.Errorf("failed cloning configuration template payload: %w", err)
+		}
 	}
 
-	destination.Close()
-
 	data, err := os.ReadFile(instanceConfigPath)
 	if err != nil {
-		return fmt.Errorf("failed reading cloned configuration data: %w", err)
+		return fmt.Errorf("failed reading configuration data: %w", err)
 	}
 
 	var rawConfig map[string]interface{}
@@ -82,18 +61,14 @@ func PrepareInstanceConfig(templateVersion string, instanceConfigPath string, co
 		return fmt.Errorf("failed parsing configuration JSON payload: %w", err)
 	}
 
-	rawConfig["ServerName"] = config.ServerName
-	rawConfig["Port"] = config.Port
-	rawConfig["MaxClients"] = config.MaxClients
-
-	if config.Password != "" {
-		rawConfig["Password"] = config.Password
-	} else {
-		rawConfig["Password"] = nil
+	for key, value := range meta.Config {
+		rawConfig[key] = value
 	}
 
-	instanceDir := filepath.Dir(instanceConfigPath)
+	rawConfig["ServerName"] = meta.ServerName
+	rawConfig["Port"] = meta.Port
 
+	instanceDir := filepath.Dir(instanceConfigPath)
 	if worldConfig, ok := rawConfig["WorldConfig"].(map[string]interface{}); ok {
 		worldConfig["SaveFileLocation"] = filepath.Join(instanceDir, "Saves", "default.vcdbs")
 	}
@@ -111,9 +86,45 @@ func PrepareInstanceConfig(templateVersion string, instanceConfigPath string, co
 		return fmt.Errorf("failed marshaling updated configuration adjustments: %w", err)
 	}
 
-	if err := os.WriteFile(instanceConfigPath, updatedData, 0644); err != nil {
-		return fmt.Errorf("failed committing updated configuration to disk: %w", err)
+	return os.WriteFile(instanceConfigPath, updatedData, 0644)
+}
+
+func ensureTemplateExists(version string, targetPath string, cfg *AppConfig) error {
+	if _, err := os.Stat(targetPath); err == nil {
+		return nil
 	}
 
+	fmt.Printf("Template for version %s not found locally. Fetching remote layout from git server...\n", version)
+
+	if err := os.MkdirAll(filepath.Dir(targetPath), 0755); err != nil {
+		return fmt.Errorf("failed to create local template cache directory: %w", err)
+	}
+
+	remoteURL := fmt.Sprintf("https://git.bellsworne.tech/chrisbell/vssm_config_templates/raw/branch/main/%s/serverconfig.json", version)
+
+	resp, err := http.Get(remoteURL)
+	if err != nil {
+		return fmt.Errorf("network error attempting to pull config template: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode == http.StatusNotFound {
+		return fmt.Errorf("version template '%s' does not exist in the remote git repository asset tree", version)
+	} else if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("remote git mirror returned unexpected HTTP status: %s", resp.Status)
+	}
+
+	out, err := os.Create(targetPath)
+	if err != nil {
+		return fmt.Errorf("failed creating cache file hook on system storage: %w", err)
+	}
+	defer out.Close()
+
+	_, err = io.Copy(out, resp.Body)
+	if err != nil {
+		return fmt.Errorf("failed stream-writing network payload cache frame to disk: %w", err)
+	}
+
+	fmt.Printf("Successfully cached configuration layout template for version %s\n", version)
 	return nil
 }

main.go

@@ -1,65 +1,210 @@
 package main
 
 import (
+	"bytes"
+	"encoding/json"
+	"flag"
 	"fmt"
+	"io"
 	"log"
+	"net/http"
+	"net/url"
 	"os"
-	"os/signal"
 	"path/filepath"
-	"syscall"
+	"strconv"
+	"text/tabwriter"
 )
 
 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")
+	defaultConfigPath := filepath.Join(home, ".config", "vssm", "config.json")
 
-	cfg, err := LoadOrCreateConfig(configPath)
+	configFlag := flag.String("config", defaultConfigPath, "Explicit path targeting a custom vssm config.json profile")
+
+	flag.Usage = printUsage
+	flag.Parse()
+
+	args := flag.Args()
+	if len(args) < 1 {
+		printUsage()
+		return
+	}
+
+	configExplicitlySet := false
+	flag.Visit(func(f *flag.Flag) {
+		if f.Name == "config" {
+			configExplicitlySet = true
+		}
+	})
+
+	if !configExplicitlySet {
+		if envConfig := os.Getenv("VSSM_CONFIG_PATH"); envConfig != "" {
+			configFlag = &envConfig
+		}
+	}
+
+	absConfigPath, err := filepath.Abs(*configFlag)
+	if err != nil {
+		log.Fatalf("Failed to resolve absolute configuration path target: %v", err)
+	}
+
+	if configExplicitlySet {
+		if err := os.Setenv("VSSM_CONFIG_PATH", absConfigPath); err != nil {
+			log.Fatalf("Warning: could not set VSSM_CONFIG_PATH: %v", err)
+		}
+	}
+
+	cfg, err := LoadOrCreateConfig(absConfigPath)
 	if err != nil {
 		log.Fatalf("Initialization failed: %v", err)
 	}
 
-	instanceName := "sample_server"
-	targetVersion := "1.22.3"
+	listenAddress := cfg.Daemon.ListenAddress + ":" + strconv.Itoa(cfg.Daemon.Port)
+	fmt.Printf("Got listen address from config: %s\n", listenAddress)
 
-	options := VsServerConfigOptions{
-		ServerName: "Sample Server",
-		Port:       4000,
-		MaxClients: 100,
-		Password:   "",
+	subCommand := args[0]
+
+	switch subCommand {
+
+	case "daemon":
+		fmt.Printf("Initializing VS server manager background supervisor [Config: %s]...\n", absConfigPath)
+		if err := StartDaemon(cfg, absConfigPath); err != nil {
+			log.Fatalf("Daemon runtime fatal error: %v", err)
+		}
+
+	case "create":
+		if len(args) < 4 {
+			log.Fatalf("Usage: vssm create <instance_name> <version> <port>")
+		}
+		name := args[1]
+		version := args[2]
+		port := args[3]
+		sendIPCRequest(cfg, "POST", fmt.Sprintf("/instances/create?name=%s&version=%s&port=%s", url.QueryEscape(name), url.QueryEscape(version), url.QueryEscape(port)), nil)
+
+	case "start":
+		if len(args) < 2 {
+			log.Fatalf("Usage: vssm start <instance_name>")
+		}
+		name := args[1]
+		sendIPCRequest(cfg, "POST", fmt.Sprintf("/instances/start?name=%s", url.QueryEscape(name)), nil)
+
+	case "stop":
+		if len(args) < 2 {
+			log.Fatalf("Usage: vssm stop <instance_name>")
+		}
+		name := args[1]
+		sendIPCRequest(cfg, "POST", fmt.Sprintf("/instances/stop?name=%s", url.QueryEscape(name)), nil)
+
+	case "cmd":
+		if len(args) < 3 {
+			log.Fatalf("Usage: vssm cmd <instance_name> \"<server command>\"")
+		}
+		name := args[1]
+		serverCmd := args[2]
+
+		payload := CommandPayload{Command: serverCmd}
+		body, _ := json.Marshal(payload)
+		sendIPCRequest(cfg, "POST", fmt.Sprintf("/instances/command?name=%s", url.QueryEscape(name)), bytes.NewBuffer(body))
+
+	case "list", "status":
+		fetchAndPrintStatus(cfg)
+
+	case "show-config":
+		fmt.Printf("%v", cfg.Storage.AppDataDir)
+
+	case "delete":
+		if len(args) < 2 {
+			log.Fatalf("Usage: vssm delete <instance_name>")
+		}
+
+		name := args[1]
+
+		deleteCmd := flag.NewFlagSet("delete", flag.ExitOnError)
+		purge := deleteCmd.Bool("purge", false, "Delete instance files from disk")
+		deleteCmd.Parse(args[2:])
+
+		sendIPCRequest(cfg, "POST", fmt.Sprintf("/instances/delete?name=%s&purge=%s", url.QueryEscape(name), url.QueryEscape(strconv.FormatBool(*purge))), nil)
+
+	default:
+		printUsage()
 	}
-
-	err = DownloadAndExtractServer(targetVersion, cfg.Storage.InstallDir)
-	if err != nil {
-		log.Fatalf("Downloader module encountered an error: %v", err)
-	}
-
-	err = CreateNewInstance(instanceName, targetVersion, options, cfg)
-	if err != nil {
-		log.Fatalf("Initialization abort: %v", err)
-	}
-
-	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)
-	}
-
-	sigChan := make(chan os.Signal, 1)
-	signal.Notify(sigChan, os.Interrupt, syscall.SIGTERM)
-
-	fmt.Println("\nServer running. Press Ctrl+C to cleanly shut down...")
-	<-sigChan
-
-	fmt.Println("\n\nTriggering graceful server termination sequence...")
-	_ = procManager.SendCommand(instanceName, "stop")
-
-	fmt.Println("Manager exited successfully.")
+}
+
+func sendIPCRequest(cfg *AppConfig, method string, path string, body io.Reader) {
+	listenAddress := cfg.Daemon.ListenAddress + ":" + strconv.Itoa(cfg.Daemon.Port)
+	targetUrl := fmt.Sprintf("http://%s%s", listenAddress, path)
+	fmt.Printf("Listen Addr: %s; Target URL: %s\n", listenAddress, targetUrl)
+	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 && resp.StatusCode != http.StatusCreated {
+		log.Fatalf("Error from daemon: %s", string(respBody))
+	}
+
+	fmt.Println(string(respBody))
+}
+
+func fetchAndPrintStatus(cfg *AppConfig) {
+	listenAddress := cfg.Daemon.ListenAddress + ":" + strconv.Itoa(cfg.Daemon.Port)
+	targetUrl := fmt.Sprintf("http://%s/instances/list", listenAddress)
+	resp, err := http.Get(targetUrl)
+	if err != nil {
+		log.Fatalf("IPC connection failed. Is the vs-manager daemon running? Error: %v", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		respBody, _ := io.ReadAll(resp.Body)
+		log.Fatalf("Error from daemon: %s", string(respBody))
+	}
+
+	var instances []InstanceStatusResponse
+	if err := json.NewDecoder(resp.Body).Decode(&instances); err != nil {
+		log.Fatalf("Failed to decode daemon status matrix: %v", err)
+	}
+
+	if len(instances) == 0 {
+		fmt.Println("No instances configured yet. Use 'create' to provision one.")
+		return
+	}
+
+	w := tabwriter.NewWriter(os.Stdout, 0, 0, 3, ' ', 0)
+	fmt.Fprintln(w, "INSTANCE NAME\tVERSION\tPORT\tSTATUS")
+	fmt.Fprintln(w, "-------------\t-------\t----\t------")
+
+	for _, inst := range instances {
+		fmt.Fprintf(w, "%s\t%s\t%d\t%s\n", inst.Name, inst.Version, inst.Port, inst.Status)
+	}
+	w.Flush()
+}
+
+func printUsage() {
+	fmt.Println("VintageStory Server Manager")
+	fmt.Println("\nGlobal Options:")
+	fmt.Println("  --config <path>                  Explicitly target a non-default config structure file location")
+	fmt.Println("\nUsage Commands:")
+	fmt.Println("  vssm daemon                      Starts the background process supervisor")
+	fmt.Println("  vssm create <name> <version>     Provisions baseline configuration and stores instance profile")
+	fmt.Println("  vssm start <name>                Launches an existing server instance using stored profile")
+	fmt.Println("  vssm stop <name>                 Gracefully shuts down a server instance")
+	fmt.Println("  vssm cmd <name> \"<command>\"    Dispatches a terminal console command down the pipe")
+	fmt.Println("  vssm list                        Displays the operational matrix of all instances")
 }

process.go

@@ -7,6 +7,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"strings"
 	"sync"
 )
 
@@ -14,16 +15,24 @@ type ProcessManager struct {
 	sync.RWMutex
 	ActiveInstances map[string]*exec.Cmd
 	StdinPipes      map[string]io.WriteCloser
+	LogBuffers      map[string]*InstanceLogBuffer
+}
+
+type InstanceLogBuffer struct {
+	sync.RWMutex
+	Lines    []string
+	MaxLines int
 }
 
 func NewProcessManager() *ProcessManager {
 	return &ProcessManager{
 		ActiveInstances: make(map[string]*exec.Cmd),
 		StdinPipes:      make(map[string]io.WriteCloser),
+		LogBuffers:      map[string]*InstanceLogBuffer{},
 	}
 }
 
-func (pm *ProcessManager) StartInstance(name string, version string, options VsServerConfigOptions, config *AppConfig) error {
+func (pm *ProcessManager) StartInstance(name string, version string, meta InstanceMetadata, config *AppConfig) error {
 	pm.Lock()
 	defer pm.Unlock()
 
@@ -65,6 +74,7 @@ func (pm *ProcessManager) StartInstance(name string, version string, options VsS
 
 	pm.ActiveInstances[name] = cmd
 	pm.StdinPipes[name] = stdinPipe
+	pm.LogBuffers[name] = NewInstanceLogBuffer(200)
 
 	go pm.streamLogs(name, stdoutPipe)
 	go pm.watchProcessExit(name, cmd)
@@ -78,9 +88,17 @@ func (pm *ProcessManager) streamLogs(name string, stdout io.ReadCloser) {
 	scanner := bufio.NewScanner(stdout)
 
 	for scanner.Scan() {
-		//stream straight to the manager console terminal,
-		// but later dispatch payloads to our web UI or a log file
-		fmt.Printf("[%s]: %s\n", name, scanner.Text())
+		line := scanner.Text()
+
+		fmt.Printf("[%s]: %s\n", name, line)
+
+		pm.RLock()
+		buf, exists := pm.LogBuffers[name]
+		pm.RUnlock()
+
+		if exists {
+			buf.Append(line)
+		}
 	}
 }
 
@@ -107,6 +125,10 @@ 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)
@@ -114,3 +136,31 @@ func (pm *ProcessManager) SendCommand(name string, command string) error {
 
 	return nil
 }
+
+func NewInstanceLogBuffer(maxLines int) *InstanceLogBuffer {
+	return &InstanceLogBuffer{
+		Lines:    make([]string, 0, maxLines),
+		MaxLines: maxLines,
+	}
+}
+
+func (lb *InstanceLogBuffer) Append(line string) {
+	lb.Lock()
+	defer lb.Unlock()
+
+	if len(lb.Lines) >= lb.MaxLines {
+		// Shift array out by dropping index 0
+		lb.Lines = lb.Lines[1:]
+	}
+	lb.Lines = append(lb.Lines, line)
+}
+
+func (lb *InstanceLogBuffer) GetSnapshot() []string {
+	lb.RLock()
+	defer lb.RUnlock()
+
+	// Return a copy so the caller can safely iterate or serialize to JSON without lock conflicts
+	snapshot := make([]string, len(lb.Lines))
+	copy(snapshot, lb.Lines)
+	return snapshot
+}