SSE impl done

internal/http_internal/ssehandler.go

@@ -0,0 +1,67 @@
+package http_internal
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	loadaverage "rpi5-health/internal/load_average"
+	"rpi5-health/internal/memory"
+	"rpi5-health/internal/processor"
+	"rpi5-health/internal/temperature"
+	"rpi5-health/internal/uptime"
+	"time"
+)
+
+func SSEHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "text/event-stream")
+	w.Header().Set("Cache-Control", "no-cache")
+	w.Header().Set("Connection", "keep-alive")
+
+	// For CORS requests
+	w.Header().Set("Access-Control-Allow-Origin", "*")
+
+	clientGone := r.Context().Done() // Channel to signal client disconnection
+
+	rc := http.NewResponseController(w)
+	t := time.NewTicker(time.Second * 5)
+	defer t.Stop()
+	for {
+		select {
+		case <-clientGone:
+			log.Println("Client disconnected")
+			return
+		case <-t.C:
+			resp := buildDashboardResponse()
+			_, err := fmt.Fprintf(w, "data: %s\n\n", resp)
+			if err != nil {
+				return
+			}
+			err = rc.Flush()
+			if err != nil {
+				return
+			}
+		}
+	}
+}
+
+func buildDashboardResponse() []byte {
+	// TODO: proper error handling
+	loadavg, _ := loadaverage.GetLoadAverage()
+	memoryInfo, _ := memory.GetRamInformation()
+	processorInfo := processor.GetCPUInformation()
+	temperatureInfo, _ := temperature.GetTemperatureInformation()
+	uptimeInfo, _ := uptime.GetUptimeInformation()
+
+	stats := ServerStatistics{
+		LoadAvgInfo:     loadavg,
+		MemoryInfo:      memoryInfo,
+		ProcessorInfo:   processorInfo,
+		TemperatureInfo: temperatureInfo,
+		UptimeInfo:      uptimeInfo,
+	}
+
+	payload, _ := json.Marshal(stats)
+
+	return payload
+}