feat: Add Go companion agent for bare metal server management
Implements complete companion agent for Rust servers not on managed panels.
Features:
- NATS integration with token auth and auto-reconnect
- Game server process management (start/stop/restart/monitor)
- File operations (read/write/delete/list) via NATS
- SteamCMD integration for automated updates
- Self-update capability with download and replace
- Heartbeat publishing every 60s with server status
- Graceful shutdown handling (SIGTERM/SIGINT)
- Zombie process prevention via cmd.Wait()
- Cross-platform builds (Linux amd64, Windows amd64)
Structure:
- cmd/agent/main.go: Entry point, config, signal handling
- internal/app/daemon.go: Main loop, NATS subscriptions
- internal/client/nats.go: NATS connection with reconnect
- internal/process/gameserver.go: Process management
- internal/process/steamcmd.go: Steam update execution
- internal/files/operations.go: File system operations
- internal/update/updater.go: Self-update logic
- Makefile: Cross-compilation targets
- README.md: Installation and configuration guide
NATS Subjects:
- Publishes: corrosion.{license_id}.companion.heartbeat
- Publishes: corrosion.{license_id}.files.response
- Subscribes: corrosion.{license_id}.cmd.server
- Subscribes: corrosion.{license_id}.files.{get|put|delete|list}
- Subscribes: corrosion.{license_id}.update.steam
- Subscribes: corrosion.{license_id}.update.companion
Built binaries: 7.0MB (Linux), 7.2MB (Windows)
Total code: 1,356 LOC across 8 files
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
This commit is contained in:
Vantz Stockwell
241
companion-agent/internal/process/gameserver.go
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241
companion-agent/internal/process/gameserver.go
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package process
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import (
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"fmt"
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"log"
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"os"
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"os/exec"
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"sync"
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"syscall"
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"time"
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)
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// GameServer manages the game server process
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type GameServer struct {
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path string
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args string
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cmd *exec.Cmd
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mu sync.RWMutex
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startTime time.Time
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isRunning bool
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lastStatus string
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}
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// NewGameServer creates a new game server manager
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func NewGameServer(path, args string) *GameServer {
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return &GameServer{
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path: path,
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args: args,
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lastStatus: "stopped",
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}
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}
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// Start starts the game server process
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func (gs *GameServer) Start() error {
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gs.mu.Lock()
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defer gs.mu.Unlock()
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if gs.isRunning {
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return fmt.Errorf("server is already running")
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}
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// Check if executable exists
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if _, err := os.Stat(gs.path); os.IsNotExist(err) {
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return fmt.Errorf("server executable not found: %s", gs.path)
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}
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log.Printf("Starting game server: %s %s", gs.path, gs.args)
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// Create command
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gs.cmd = exec.Command(gs.path)
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// Parse args if provided
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if gs.args != "" {
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// Simple space-split parsing (TODO: handle quoted args properly)
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gs.cmd.Args = append(gs.cmd.Args, splitArgs(gs.args)...)
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}
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// Set working directory to server directory
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gs.cmd.Dir = getDirectory(gs.path)
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// Redirect output to our logs
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gs.cmd.Stdout = os.Stdout
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gs.cmd.Stderr = os.Stderr
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// Start the process
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if err := gs.cmd.Start(); err != nil {
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gs.isRunning = false
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gs.lastStatus = "failed"
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return fmt.Errorf("failed to start server: %w", err)
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}
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gs.isRunning = true
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gs.startTime = time.Now()
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gs.lastStatus = "running"
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// Monitor process in background to prevent zombies
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go gs.monitorProcess()
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log.Printf("Game server started with PID %d", gs.cmd.Process.Pid)
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return nil
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}
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// Stop stops the game server process
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func (gs *GameServer) Stop() error {
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gs.mu.Lock()
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defer gs.mu.Unlock()
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if !gs.isRunning || gs.cmd == nil || gs.cmd.Process == nil {
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return fmt.Errorf("server is not running")
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}
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log.Printf("Stopping game server (PID %d)", gs.cmd.Process.Pid)
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// Send SIGTERM for graceful shutdown
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if err := gs.cmd.Process.Signal(syscall.SIGTERM); err != nil {
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log.Printf("Failed to send SIGTERM, forcing kill: %v", err)
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// Force kill if SIGTERM fails
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if killErr := gs.cmd.Process.Kill(); killErr != nil {
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return fmt.Errorf("failed to kill process: %w", killErr)
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}
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}
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// Wait for process to exit (with timeout)
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done := make(chan error, 1)
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go func() {
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done <- gs.cmd.Wait()
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}()
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select {
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case <-done:
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log.Println("Server stopped gracefully")
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case <-time.After(30 * time.Second):
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log.Println("Server did not stop gracefully, forcing kill")
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gs.cmd.Process.Kill()
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<-done
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}
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gs.isRunning = false
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gs.lastStatus = "stopped"
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gs.cmd = nil
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return nil
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}
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// Restart restarts the game server
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func (gs *GameServer) Restart() error {
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log.Println("Restarting game server...")
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// Stop if running
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if gs.isRunning {
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if err := gs.Stop(); err != nil {
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return fmt.Errorf("failed to stop server for restart: %w", err)
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}
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}
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// Wait a moment for cleanup
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time.Sleep(2 * time.Second)
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// Start again
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return gs.Start()
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}
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// Status returns the current server status
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func (gs *GameServer) Status() string {
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gs.mu.RLock()
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defer gs.mu.RUnlock()
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if !gs.isRunning {
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return "stopped"
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}
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// Check if process is actually alive
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if gs.cmd != nil && gs.cmd.Process != nil {
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// Send signal 0 to check if process exists
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if err := gs.cmd.Process.Signal(syscall.Signal(0)); err != nil {
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return "crashed"
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}
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}
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return gs.lastStatus
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}
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// Uptime returns how long the server has been running
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func (gs *GameServer) Uptime() time.Duration {
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gs.mu.RLock()
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defer gs.mu.RUnlock()
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if !gs.isRunning {
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return 0
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}
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return time.Since(gs.startTime)
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}
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// IsRunning returns whether the server is currently running
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func (gs *GameServer) IsRunning() bool {
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gs.mu.RLock()
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defer gs.mu.RUnlock()
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return gs.isRunning
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}
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// monitorProcess waits for the process to exit and updates state
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// This prevents zombie processes by calling Wait()
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func (gs *GameServer) monitorProcess() {
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if gs.cmd == nil || gs.cmd.Process == nil {
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return
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}
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// Wait for process to exit (blocks until process dies)
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err := gs.cmd.Wait()
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gs.mu.Lock()
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defer gs.mu.Unlock()
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gs.isRunning = false
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if err != nil {
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log.Printf("Game server process exited with error: %v", err)
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gs.lastStatus = "crashed"
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} else {
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log.Println("Game server process exited normally")
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gs.lastStatus = "stopped"
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}
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// TODO: Could trigger crash recovery notification here
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}
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// Helper functions
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func getDirectory(path string) string {
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for i := len(path) - 1; i >= 0; i-- {
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if path[i] == '/' || path[i] == '\\' {
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return path[:i]
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}
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}
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return "."
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}
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func splitArgs(args string) []string {
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// Simple space-based splitting
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// TODO: Handle quoted strings properly for args with spaces
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var result []string
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current := ""
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for _, char := range args {
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if char == ' ' {
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if current != "" {
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result = append(result, current)
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current = ""
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}
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} else {
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current += string(char)
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}
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}
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if current != "" {
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result = append(result, current)
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}
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return result
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}
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