Split stream part of pollhandlermap into its own func

poll.go

@@ -0,0 +1,98 @@
+package headscale
+
+import (
+	"io"
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"github.com/rs/zerolog/log"
+	"tailscale.com/tailcfg"
+	"tailscale.com/types/wgkey"
+)
+
+func (h *Headscale) PollNetMapStream(
+	c *gin.Context,
+	m Machine,
+	req tailcfg.MapRequest,
+	mKey wgkey.Key,
+	pollData chan []byte,
+	update chan []byte,
+	cancelKeepAlive chan []byte,
+) {
+
+	go h.keepAlive(cancelKeepAlive, pollData, mKey, req, m)
+
+	c.Stream(func(w io.Writer) bool {
+		log.Trace().
+			Str("handler", "PollNetMapStream").
+			Str("machine", m.Name).
+			Msg("Waiting for data to stream...")
+		select {
+
+		case data := <-pollData:
+			log.Trace().
+				Str("handler", "PollNetMapStream").
+				Str("machine", m.Name).
+				Int("bytes", len(data)).
+				Msg("Sending data received via pollData channel")
+			_, err := w.Write(data)
+			if err != nil {
+				log.Error().
+					Str("handler", "PollNetMapStream").
+					Str("machine", m.Name).
+					Err(err).
+					Msg("Cannot write data")
+			}
+			log.Trace().
+				Str("handler", "PollNetMapStream").
+				Str("machine", m.Name).
+				Int("bytes", len(data)).
+				Msg("Data from pollData channel written successfully")
+			now := time.Now().UTC()
+			m.LastSeen = &now
+			h.db.Save(&m)
+			log.Trace().
+				Str("handler", "PollNetMapStream").
+				Str("machine", m.Name).
+				Int("bytes", len(data)).
+				Msg("Machine updated successfully after sending pollData")
+			return true
+
+		case <-update:
+			log.Debug().
+				Str("handler", "PollNetMapStream").
+				Str("machine", m.Name).
+				Msg("Received a request for update")
+			data, err := h.getMapResponse(mKey, req, m)
+			if err != nil {
+				log.Error().
+					Str("handler", "PollNetMapStream").
+					Str("machine", m.Name).
+					Err(err).
+					Msg("Could not get the map update")
+			}
+			_, err = w.Write(*data)
+			if err != nil {
+				log.Error().
+					Str("handler", "PollNetMapStream").
+					Str("machine", m.Name).
+					Err(err).
+					Msg("Could not write the map response")
+			}
+			return true
+
+		case <-c.Request.Context().Done():
+			log.Info().
+				Str("handler", "PollNetMapStream").
+				Str("machine", m.Name).
+				Msg("The client has closed the connection")
+			now := time.Now().UTC()
+			m.LastSeen = &now
+			h.db.Save(&m)
+			cancelKeepAlive <- []byte{}
+			h.clientsPolling.Delete(m.ID)
+			close(update)
+			return false
+		}
+	})
+}