feat: websocket client and command router

go.mod

@@ -2,4 +2,7 @@ module github.com/theta42/theta-agent
 
 go 1.22.2
 
-require gopkg.in/yaml.v3 v3.0.1 // indirect
+require (
+	github.com/gorilla/websocket v1.5.3 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

go.sum

@@ -1,3 +1,5 @@
+github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aNNg=
+github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

main.go

@@ -30,8 +30,8 @@ func main() {
 		cfg.Capabilities.ArbitraryBash,
 	)
 
-	// TODO: Initialize WebSocket connection to SSO Manager
-	// TODO: Start telemetry background loop if capabilities.Telemetry == true
+	// WebSocket connection to SSO Manager
+	go connectWebSocket(cfg)
 
 	// Block until signal is received
 	sigs := make(chan os.Signal, 1)

websocket.go

@@ -0,0 +1,107 @@
+package main
+
+import (
+	"encoding/json"
+	"log"
+	"net/url"
+	"strings"
+	"time"
+
+	"github.com/gorilla/websocket"
+)
+
+type WSMessage struct {
+	Type    string                 `json:"type"`
+	Payload map[string]interface{} `json:"payload"`
+}
+
+func connectWebSocket(cfg *Config) {
+	for {
+		// Ensure protocol is ws/wss
+		serverURL := strings.Replace(cfg.ServerURL, "http://", "ws://", 1)
+		serverURL = strings.Replace(serverURL, "https://", "wss://", 1)
+
+		u, err := url.Parse(serverURL)
+		if err != nil {
+			log.Fatalf("Invalid ServerURL: %v", err)
+		}
+		u.Path = "/api/agent/ws"
+		u.RawQuery = "token=" + cfg.AuthToken
+
+		log.Printf("Connecting to %s", u.String())
+
+		c, _, err := websocket.DefaultDialer.Dial(u.String(), nil)
+		if err != nil {
+			log.Printf("Dial error: %v. Retrying in 5 seconds...", err)
+			time.Sleep(5 * time.Second)
+			continue
+		}
+
+		log.Println("Successfully connected to SSO Manager.")
+
+		// Start telemetry if enabled
+		var telemetryTicker *time.Ticker
+		var telemetryDone chan bool
+		if cfg.Capabilities.Telemetry {
+			telemetryTicker, telemetryDone = startTelemetry(c, cfg)
+		}
+
+		// Read loop
+		for {
+			_, message, err := c.ReadMessage()
+			if err != nil {
+				log.Println("WebSocket read error:", err)
+				break // break read loop, reconnect
+			}
+
+			var msg WSMessage
+			if err := json.Unmarshal(message, &msg); err != nil {
+				log.Printf("Error unmarshaling message: %v", err)
+				continue
+			}
+
+			handleCommand(cfg, msg, c)
+		}
+
+		// Cleanup on disconnect
+		c.Close()
+		if telemetryTicker != nil {
+			telemetryTicker.Stop()
+			telemetryDone <- true
+		}
+
+		log.Println("WebSocket disconnected. Reconnecting in 5 seconds...")
+		time.Sleep(5 * time.Second)
+	}
+}
+
+func handleCommand(cfg *Config, msg WSMessage, c *websocket.Conn) {
+	log.Printf("Received command: %s", msg.Type)
+
+	switch msg.Type {
+	case "config":
+		log.Printf("Received config payload: %v", msg.Payload)
+	case "reboot":
+		if !cfg.Capabilities.Reboot {
+			log.Println("Reboot rejected: capability disabled in agent.yml")
+			return
+		}
+		log.Println("Reboot capability enabled. (Simulation: rebooting system...)")
+	case "service_restart":
+		serviceName, ok := msg.Payload["service"].(string)
+		if !ok || !cfg.Capabilities.CanManageService(serviceName) {
+			log.Printf("Service restart rejected for '%s': not in allowed service list", serviceName)
+			return
+		}
+		log.Printf("Restarting service %s...", serviceName)
+	default:
+		log.Printf("Unknown command type: %s", msg.Type)
+	}
+}
+
+func startTelemetry(c *websocket.Conn, cfg *Config) (*time.Ticker, chan bool) {
+	ticker := time.Ticker{C: nil} // placeholder logic
+	done := make(chan bool)
+	log.Println("Telemetry loop started (placeholder).")
+	return &ticker, done
+}