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
416
companion-agent/internal/app/daemon.go
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416
companion-agent/internal/app/daemon.go
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package app
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import (
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"context"
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"encoding/json"
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"fmt"
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"log"
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"runtime"
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"time"
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"github.com/nats-io/nats.go"
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"github.com/vigilcyber/corrosion-companion/internal/files"
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"github.com/vigilcyber/corrosion-companion/internal/process"
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"github.com/vigilcyber/corrosion-companion/internal/update"
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)
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// DaemonConfig holds configuration for the daemon
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type DaemonConfig struct {
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LicenseID string
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HeartbeatInterval time.Duration
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SteamCMDPath string
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GameServerPath string
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GameServerArgs string
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Version string
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}
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// Daemon manages the companion agent's main operations
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type Daemon struct {
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nc *nats.Conn
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cfg *DaemonConfig
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gameServer *process.GameServer
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fileOps *files.Operations
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updater *update.Updater
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subscriptions []*nats.Subscription
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}
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// HeartbeatPayload represents the data sent in heartbeat messages
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type HeartbeatPayload struct {
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Timestamp string `json:"timestamp"`
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Status string `json:"status"`
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ServerStatus string `json:"server_status"`
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UptimeSeconds int64 `json:"uptime_seconds"`
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DiskFreeMB int64 `json:"disk_free_mb"`
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CPUPercent float64 `json:"cpu_percent"`
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LastUpdate string `json:"last_update"`
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PlayerCount int `json:"player_count"`
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Version string `json:"version"`
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OS string `json:"os"`
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Arch string `json:"arch"`
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}
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// NewDaemon creates a new daemon instance
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func NewDaemon(nc *nats.Conn, cfg *DaemonConfig) (*Daemon, error) {
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gameServer := process.NewGameServer(cfg.GameServerPath, cfg.GameServerArgs)
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fileOps := files.NewOperations()
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updater := update.NewUpdater(cfg.Version)
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d := &Daemon{
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nc: nc,
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cfg: cfg,
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gameServer: gameServer,
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fileOps: fileOps,
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updater: updater,
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}
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return d, nil
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}
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// Run starts the daemon and blocks until context is cancelled
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func (d *Daemon) Run(ctx context.Context) error {
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log.Println("Starting daemon subscriptions...")
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// Subscribe to server control commands
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if err := d.subscribeServerCommands(); err != nil {
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return fmt.Errorf("failed to subscribe to server commands: %w", err)
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}
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// Subscribe to file operations
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if err := d.subscribeFileOperations(); err != nil {
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return fmt.Errorf("failed to subscribe to file operations: %w", err)
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}
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// Subscribe to SteamCMD update commands
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if err := d.subscribeSteamUpdate(); err != nil {
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return fmt.Errorf("failed to subscribe to steam updates: %w", err)
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}
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// Subscribe to self-update commands
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if err := d.subscribeSelfUpdate(); err != nil {
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return fmt.Errorf("failed to subscribe to self-update: %w", err)
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}
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log.Println("All subscriptions active")
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// Start heartbeat ticker
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ticker := time.NewTicker(d.cfg.HeartbeatInterval)
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defer ticker.Stop()
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// Send initial heartbeat immediately
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d.publishHeartbeat()
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// Main event loop
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for {
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select {
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case <-ctx.Done():
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log.Println("Shutdown signal received, cleaning up...")
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d.cleanup()
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return nil
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case <-ticker.C:
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d.publishHeartbeat()
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}
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}
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}
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// subscribeServerCommands subscribes to server process control commands
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func (d *Daemon) subscribeServerCommands() error {
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subject := fmt.Sprintf("corrosion.%s.cmd.server", d.cfg.LicenseID)
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sub, err := d.nc.Subscribe(subject, func(msg *nats.Msg) {
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var cmd struct {
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Action string `json:"action"`
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}
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if err := json.Unmarshal(msg.Data, &cmd); err != nil {
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log.Printf("Failed to parse server command: %v", err)
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d.respondError(msg, "invalid_command", err.Error())
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return
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}
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log.Printf("Received server command: %s", cmd.Action)
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var err error
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switch cmd.Action {
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case "start":
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err = d.gameServer.Start()
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case "stop":
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err = d.gameServer.Stop()
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case "restart":
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err = d.gameServer.Restart()
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default:
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err = fmt.Errorf("unknown action: %s", cmd.Action)
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}
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if err != nil {
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log.Printf("Server command failed: %v", err)
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d.respondError(msg, "command_failed", err.Error())
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} else {
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d.respondSuccess(msg, map[string]interface{}{
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"action": cmd.Action,
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"status": "success",
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})
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}
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})
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if err != nil {
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return err
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}
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d.subscriptions = append(d.subscriptions, sub)
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log.Printf("Subscribed to: %s", subject)
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return nil
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}
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// subscribeFileOperations subscribes to file operation commands
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func (d *Daemon) subscribeFileOperations() error {
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subjects := []string{
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fmt.Sprintf("corrosion.%s.files.get", d.cfg.LicenseID),
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fmt.Sprintf("corrosion.%s.files.put", d.cfg.LicenseID),
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fmt.Sprintf("corrosion.%s.files.delete", d.cfg.LicenseID),
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fmt.Sprintf("corrosion.%s.files.list", d.cfg.LicenseID),
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}
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for _, subject := range subjects {
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sub, err := d.nc.Subscribe(subject, func(msg *nats.Msg) {
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d.handleFileOperation(msg)
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})
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if err != nil {
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return err
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}
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d.subscriptions = append(d.subscriptions, sub)
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log.Printf("Subscribed to: %s", subject)
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}
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return nil
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}
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// subscribeSteamUpdate subscribes to SteamCMD update commands
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func (d *Daemon) subscribeSteamUpdate() error {
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subject := fmt.Sprintf("corrosion.%s.update.steam", d.cfg.LicenseID)
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sub, err := d.nc.Subscribe(subject, func(msg *nats.Msg) {
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var cmd struct {
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Validate bool `json:"validate"`
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}
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if err := json.Unmarshal(msg.Data, &cmd); err != nil {
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log.Printf("Failed to parse steam update command: %v", err)
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d.respondError(msg, "invalid_command", err.Error())
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return
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}
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log.Printf("Received SteamCMD update command (validate=%v)", cmd.Validate)
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steamCmd := process.NewSteamCMD(d.cfg.SteamCMDPath)
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err := steamCmd.UpdateRustServer(cmd.Validate)
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if err != nil {
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log.Printf("SteamCMD update failed: %v", err)
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d.respondError(msg, "update_failed", err.Error())
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} else {
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d.respondSuccess(msg, map[string]interface{}{
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"status": "success",
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"validate": cmd.Validate,
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})
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}
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})
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if err != nil {
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return err
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}
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d.subscriptions = append(d.subscriptions, sub)
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log.Printf("Subscribed to: %s", subject)
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return nil
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}
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// subscribeSelfUpdate subscribes to companion agent self-update commands
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func (d *Daemon) subscribeSelfUpdate() error {
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subject := fmt.Sprintf("corrosion.%s.update.companion", d.cfg.LicenseID)
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sub, err := d.nc.Subscribe(subject, func(msg *nats.Msg) {
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var cmd struct {
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DownloadURL string `json:"download_url"`
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Version string `json:"version"`
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}
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if err := json.Unmarshal(msg.Data, &cmd); err != nil {
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log.Printf("Failed to parse self-update command: %v", err)
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d.respondError(msg, "invalid_command", err.Error())
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return
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}
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log.Printf("Received self-update command: version=%s", cmd.Version)
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err := d.updater.PerformUpdate(cmd.DownloadURL, cmd.Version)
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if err != nil {
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log.Printf("Self-update failed: %v", err)
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d.respondError(msg, "update_failed", err.Error())
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} else {
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d.respondSuccess(msg, map[string]interface{}{
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"status": "success",
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"version": cmd.Version,
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"message": "Update downloaded, restart required",
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})
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}
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})
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if err != nil {
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return err
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}
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d.subscriptions = append(d.subscriptions, sub)
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log.Printf("Subscribed to: %s", subject)
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return nil
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}
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// handleFileOperation processes file operation requests
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func (d *Daemon) handleFileOperation(msg *nats.Msg) {
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// Parse common fields
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var baseCmd struct {
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RequestID string `json:"request_id"`
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Path string `json:"path"`
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DownloadURL string `json:"download_url,omitempty"` // For put operations
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}
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if err := json.Unmarshal(msg.Data, &baseCmd); err != nil {
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log.Printf("Failed to parse file operation: %v", err)
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d.respondError(msg, "invalid_command", err.Error())
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return
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}
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var result interface{}
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var err error
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// Determine operation type from subject
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if contains(msg.Subject, ".files.get") {
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result, err = d.fileOps.Read(baseCmd.Path)
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} else if contains(msg.Subject, ".files.put") {
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err = d.fileOps.Write(baseCmd.Path, baseCmd.DownloadURL)
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result = map[string]string{"status": "written"}
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} else if contains(msg.Subject, ".files.delete") {
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err = d.fileOps.Delete(baseCmd.Path)
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result = map[string]string{"status": "deleted"}
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} else if contains(msg.Subject, ".files.list") {
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result, err = d.fileOps.List(baseCmd.Path)
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}
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responseSubject := fmt.Sprintf("corrosion.%s.files.response", d.cfg.LicenseID)
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if err != nil {
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log.Printf("File operation failed: %v", err)
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d.publishResponse(responseSubject, map[string]interface{}{
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"request_id": baseCmd.RequestID,
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"status": "error",
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"error": err.Error(),
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})
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} else {
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d.publishResponse(responseSubject, map[string]interface{}{
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"request_id": baseCmd.RequestID,
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"status": "success",
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"data": result,
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})
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}
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}
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// publishHeartbeat sends a heartbeat message to the cloud
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func (d *Daemon) publishHeartbeat() {
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subject := fmt.Sprintf("corrosion.%s.companion.heartbeat", d.cfg.LicenseID)
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status := d.gameServer.Status()
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uptime := d.gameServer.Uptime()
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diskFree := getDiskFreeSpace(d.cfg.GameServerPath)
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payload := HeartbeatPayload{
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Timestamp: time.Now().UTC().Format(time.RFC3339),
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Status: "running",
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ServerStatus: status,
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UptimeSeconds: int64(uptime.Seconds()),
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DiskFreeMB: diskFree,
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CPUPercent: 0.0, // TODO: Implement CPU monitoring
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LastUpdate: "", // TODO: Track last SteamCMD update
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PlayerCount: 0, // Populated by plugin, not companion
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Version: d.cfg.Version,
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OS: runtime.GOOS,
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Arch: runtime.GOARCH,
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}
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data, err := json.Marshal(payload)
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if err != nil {
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log.Printf("Failed to marshal heartbeat: %v", err)
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return
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}
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if err := d.nc.Publish(subject, data); err != nil {
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log.Printf("Failed to publish heartbeat: %v", err)
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}
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}
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// respondError sends an error response to a command
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func (d *Daemon) respondError(msg *nats.Msg, code, message string) {
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response := map[string]interface{}{
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"status": "error",
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"code": code,
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"message": message,
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}
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data, _ := json.Marshal(response)
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if err := msg.Respond(data); err != nil {
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log.Printf("Failed to send error response: %v", err)
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}
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}
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// respondSuccess sends a success response to a command
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func (d *Daemon) respondSuccess(msg *nats.Msg, payload interface{}) {
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data, _ := json.Marshal(payload)
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if err := msg.Respond(data); err != nil {
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log.Printf("Failed to send success response: %v", err)
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}
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}
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// publishResponse publishes a response to a specific subject
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func (d *Daemon) publishResponse(subject string, payload interface{}) {
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data, _ := json.Marshal(payload)
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if err := d.nc.Publish(subject, data); err != nil {
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log.Printf("Failed to publish response: %v", err)
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}
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}
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// cleanup gracefully shuts down all daemon operations
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func (d *Daemon) cleanup() {
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log.Println("Unsubscribing from all subjects...")
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for _, sub := range d.subscriptions {
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sub.Unsubscribe()
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}
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log.Println("Draining NATS connection...")
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d.nc.Drain()
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log.Println("Cleanup complete")
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}
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// Helper functions
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func contains(s, substr string) bool {
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return len(s) >= len(substr) && s[len(s)-len(substr):] == substr ||
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(len(s) > len(substr) && s[0:len(substr)] == substr) ||
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(len(s) > 0 && len(substr) > 0 && findInString(s, substr))
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}
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func findInString(s, substr string) bool {
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for i := 0; i <= len(s)-len(substr); i++ {
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if s[i:i+len(substr)] == substr {
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return true
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}
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}
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return false
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}
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func getDiskFreeSpace(path string) int64 {
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// TODO: Implement actual disk space check
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// For now, return placeholder
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return 50000
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}
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Reference in New Issue
Block a user