feat: use a debug logger for agent

agent/internal/hpagent/handler.go

@@ -0,0 +1,84 @@
+package hpagent
+
+import (
+	"encoding/json"
+	"sync"
+
+	"github.com/tale/headplane/agent/internal/util"
+	"tailscale.com/tailcfg"
+)
+
+// Represents messages from the Headplane master
+type RecvMessage struct {
+	NodeIDs []string
+}
+
+// Starts listening for messages from the Headplane master
+func (s *Socket) FollowMaster() {
+	log := util.GetLogger()
+
+	for {
+		_, message, err := s.ReadMessage()
+		if err != nil {
+			log.Error("Error reading message: %s", err)
+			return
+		}
+
+		var msg RecvMessage
+		err = json.Unmarshal(message, &msg)
+		if err != nil {
+			log.Error("Unable to unmarshal message: %s", err)
+			log.Debug("Full Error: %v", err)
+			continue
+		}
+
+		log.Debug("Recieved message from master: %v", message)
+
+		if len(msg.NodeIDs) == 0 {
+			log.Debug("Message recieved had no node IDs")
+			log.Debug("Full message: %s", message)
+			continue
+		}
+
+		// Accumulate the results since we invoke via gofunc
+		results := make(map[string]*tailcfg.HostinfoView)
+		mu := sync.Mutex{}
+		wg := sync.WaitGroup{}
+
+		for _, nodeID := range msg.NodeIDs {
+			wg.Add(1)
+			go func(nodeID string) {
+				defer wg.Done()
+				result, err := s.Agent.GetStatusForPeer(nodeID)
+				if err != nil {
+					log.Error("Unable to get status for node %s: %s", nodeID, err)
+					return
+				}
+
+				if result == nil {
+					log.Debug("No status for node %s", nodeID)
+					return
+				}
+
+				mu.Lock()
+				results[nodeID] = result
+				mu.Unlock()
+			}(nodeID)
+		}
+
+		wg.Wait()
+
+		// Send the results back to the Headplane master
+		log.Debug("Sending status back to master: %v", results)
+		err = s.SendStatus(results)
+		if err != nil {
+			log.Error("Error sending status: %s", err)
+			return
+		}
+	}
+}
+
+// Stops listening for messages from the Headplane master
+func (s *Socket) StopListening() {
+	s.Close()
+}