add code

.gitignore

+.idea
+build

Makefile

+.PHONY: default all agent server
+
+GOBIN = $(shell pwd)/build/bin
+
+default: all
+
+all: server agent
+
+server:
+	go build $(BUILD_FLAGS) -v -o=${GOBIN}/nmserver ./server
+
+agent:
+	go build $(BUILD_FLAGS) -v -o=${GOBIN}/nmagent ./agent

README.md

+# Node Monitor
+
+A simple node monitoring system with Agent and Server components written in Go.
+
+## Features
+
+- **Agent**: Collects system metrics (CPU, Memory, Disk usage) and reports to server every 5 seconds
+- **Server**: Receives reports from agents and provides a web dashboard
+
+## Usage
+
+### Start the Server
+
+```bash
+cd server
+go run main.go -port=8080
+```
+
+### Start the Agent
+
+```bash
+cd agent
+go run . -server=http://localhost:8080 -interval=5s
+```
+
+### View Dashboard
+
+Open `http://localhost:8080` in your browser to see the monitoring dashboard.
+
+## API Endpoints
+
+- `POST /api/report` - Endpoint for agents to report status
+- `GET /` - Web dashboard showing all nodes
+
+## Dependencies
+
+- `github.com/shirou/gopsutil/v3` - System metrics collection
+
+## Installation
+
+```bash
+go mod tidy
+```
+
+## Monitoring System Documentation
+
+This documentation provides an overview of the monitoring system, including its components, usage, API endpoints, dependencies, and installation instructions.
+
+### Components
+
+The monitoring system consists of two main components:
+
+1. **Agent**: A lightweight process that runs on each node, collecting system metrics and reporting them to the server.
+2. **Server**: The central component that receives reports from agents, stores the data, and provides a web-based dashboard for monitoring.
+
+### Usage
+
+To use the monitoring system, follow these steps:
+
+1. **Start the Server**: Navigate to the `server` directory and run `go run main.go -port=8080` to start the server on port 8080.
+2. **Start the Agent**: Navigate to the `agent` directory and run `go run . -server=http://localhost:8080 -interval=5s` to start the agent, pointing it to the server's address.
+3. **View Dashboard**: Open a web browser and go to `http://localhost:8080` to access the monitoring dashboard.
+
+### API Endpoints
+
+The monitoring system provides the following API endpoints:
+
+- `POST /api/report`: This endpoint is used by agents to report the status of the node. The agent sends a JSON payload containing the system metrics to this endpoint.
+- `GET /`: This endpoint serves the web dashboard, which displays the status of all nodes being monitored.
+
+### Dependencies
+
+The monitoring system relies on the following external package:
+
+- `github.com/shirou/gopsutil/v3`: This package is used for collecting system metrics such as CPU, memory, and disk usage.
+
+### Installation
+
+To install the monitoring system, execute the following command:
+
+```bash
+go mod tidy
+```
+
+This command will download and install the necessary dependencies for the project.
+
+### License
+
+This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.

agent/main.go

+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"flag"
+	"fmt"
+	"github.com/ethereum/go-ethereum/ethclient"
+	"log"
+	"net/http"
+	"time"
+
+	"nodemonitor/types"
+)
+
+var (
+	serverURL = flag.String("server", "http://localhost:8080", "Server URL")
+	interval  = flag.Duration("interval", 5*time.Second, "Report interval")
+	localRpc  = flag.String("local-rpc", "", "Local Node RPC URL")
+	nameTag   = flag.String("name-tag", "", "Name tag")
+)
+
+func main() {
+	flag.Parse()
+	if *nameTag == "" {
+		log.Fatal("name-tag is required")
+	}
+
+	nodeID := *nameTag
+	log.Printf("Starting agent with node ID: %s", nodeID)
+	log.Printf("Reporting to server: %s", *serverURL)
+
+	ticker := time.NewTicker(*interval)
+	defer ticker.Stop()
+	var nodeClient *ethclient.Client
+	var err error
+	if len(*localRpc) > 0 {
+		nodeClient, err = ethclient.Dial(*localRpc)
+		if err != nil {
+			log.Fatalf("Failed to connect to local node RPC: %v", err)
+		}
+	}
+
+	for {
+		status := collectNodeStatus(nodeID, nodeClient)
+		if err := reportToServer(status); err != nil {
+			log.Printf("Failed to report to server: %v", err)
+		} else {
+			log.Printf("Successfully reported status")
+		}
+
+		<-ticker.C
+	}
+}
+
+func collectNodeStatus(nodeID string, nodeClient *ethclient.Client) types.NodeStatus {
+	cpuUsage := getCPUUsage()
+	memUsage, memTotal, memFree := getMemoryInfo()
+	diskUsage, diskTotal, diskFree := getDiskInfo()
+	privateIP := getPrivateIP()
+	publicIP := getPublicIP()
+	nodeHeight := getNodeHeight(nodeClient)
+
+	return types.NodeStatus{
+		NodeID:      nodeID,
+		CPUUsage:    cpuUsage,
+		MemoryUsage: memUsage,
+		MemoryTotal: memTotal,
+		MemoryFree:  memFree,
+		DiskUsage:   diskUsage,
+		DiskTotal:   diskTotal,
+		DiskFree:    diskFree,
+		PrivateIP:   privateIP,
+		PublicIP:    publicIP,
+		Height:      nodeHeight,
+		Timestamp:   time.Now(),
+	}
+}
+
+func reportToServer(status types.NodeStatus) error {
+	data, err := json.Marshal(status)
+	if err != nil {
+		return fmt.Errorf("failed to marshal status: %v", err)
+	}
+
+	resp, err := http.Post(*serverURL+"/api/report", "application/json", bytes.NewBuffer(data))
+	if err != nil {
+		return fmt.Errorf("failed to post to server: %v", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("server returned status: %d", resp.StatusCode)
+	}
+
+	return nil
+}

agent/metrics.go

+package main
+
+import (
+	"context"
+	"fmt"
+	"github.com/ethereum/go-ethereum/ethclient"
+	"io"
+	"net"
+	"net/http"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/shirou/gopsutil/v3/cpu"
+	"github.com/shirou/gopsutil/v3/disk"
+	"github.com/shirou/gopsutil/v3/mem"
+)
+
+// getPrivateIP gets the local private IP address
+func getPrivateIP() string {
+	conn, err := net.Dial("udp", "8.8.8.8:80")
+	if err != nil {
+		return "unknown"
+	}
+	defer conn.Close()
+
+	localAddr := conn.LocalAddr().(*net.UDPAddr)
+	return localAddr.IP.String()
+}
+
+// getPublicIP gets the public IP address
+func getPublicIP() string {
+	resp, err := http.Get("https://api.ipify.org?format=text")
+	if err != nil {
+		return "unknown"
+	}
+	defer resp.Body.Close()
+
+	ip, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "unknown"
+	}
+
+	return strings.TrimSpace(string(ip))
+}
+
+func getNodeHeight(nodeClient *ethclient.Client) string {
+	if nodeClient == nil {
+		return "N/A"
+	}
+	height, err := nodeClient.BlockNumber(context.Background())
+	if err != nil {
+		return fmt.Sprintf("fetch error:%s", err)
+	}
+	return strconv.FormatUint(height, 10)
+}
+
+// getCPUUsage gets CPU usage percentage
+func getCPUUsage() float64 {
+	percent, err := cpu.Percent(time.Second, false)
+	if err != nil || len(percent) == 0 {
+		return 0
+	}
+	return percent[0]
+}
+
+// getMemoryInfo gets memory usage information
+func getMemoryInfo() (float64, uint64, uint64) {
+	v, err := mem.VirtualMemory()
+	if err != nil {
+		return 0, 0, 0
+	}
+	return v.UsedPercent, v.Total, v.Available
+}
+
+// getDiskInfo gets disk usage information
+func getDiskInfo() (float64, uint64, uint64) {
+	usage, err := disk.Usage("/")
+	if err != nil {
+		return 0, 0, 0
+	}
+	return usage.UsedPercent, usage.Total, usage.Free
+}
+
+// getNodeID generates a unique node identifier
+func getNodeID() string {
+	hostname, err := os.Hostname()
+	if err != nil {
+		hostname = "unknown"
+	}
+	return fmt.Sprintf("%s-%s", hostname, getPrivateIP())
+}

go.mod

+module nodemonitor
+
+go 1.23.0
+
+toolchain go1.24.0
+
+require (
+	github.com/ethereum/go-ethereum v1.16.2
+	github.com/shirou/gopsutil/v3 v3.23.12
+)
+
+require (
+	github.com/Microsoft/go-winio v0.6.2 // indirect
+	github.com/StackExchange/wmi v1.2.1 // indirect
+	github.com/bits-and-blooms/bitset v1.20.0 // indirect
+	github.com/consensys/gnark-crypto v0.18.0 // indirect
+	github.com/crate-crypto/go-eth-kzg v1.3.0 // indirect
+	github.com/crate-crypto/go-ipa v0.0.0-20240724233137-53bbb0ceb27a // indirect
+	github.com/deckarep/golang-set/v2 v2.6.0 // indirect
+	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1 // indirect
+	github.com/ethereum/c-kzg-4844/v2 v2.1.0 // indirect
+	github.com/ethereum/go-verkle v0.2.2 // indirect
+	github.com/go-ole/go-ole v1.3.0 // indirect
+	github.com/gorilla/websocket v1.4.2 // indirect
+	github.com/holiman/uint256 v1.3.2 // indirect
+	github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0 // indirect
+	github.com/power-devops/perfstat v0.0.0-20210106213030-5aafc221ea8c // indirect
+	github.com/shirou/gopsutil v3.21.4-0.20210419000835-c7a38de76ee5+incompatible // indirect
+	github.com/shoenig/go-m1cpu v0.1.6 // indirect
+	github.com/supranational/blst v0.3.14 // indirect
+	github.com/tklauser/go-sysconf v0.3.12 // indirect
+	github.com/tklauser/numcpus v0.6.1 // indirect
+	github.com/yusufpapurcu/wmi v1.2.3 // indirect
+	golang.org/x/crypto v0.36.0 // indirect
+	golang.org/x/sync v0.12.0 // indirect
+	golang.org/x/sys v0.31.0 // indirect
+)

go.sum

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+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

server/main.go

+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"fmt"
+	"html/template"
+	"log"
+	"net/http"
+	"sort"
+	"sync"
+	"time"
+
+	"nodemonitor/types"
+)
+
+var (
+	port = flag.String("port", "8080", "Server port")
+)
+
+type Server struct {
+	nodes map[string]*types.NodeStatus
+	mutex sync.RWMutex
+}
+
+func NewServer() *Server {
+	return &Server{
+		nodes: make(map[string]*types.NodeStatus),
+	}
+}
+
+func (s *Server) handleReport(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	var status types.NodeStatus
+	if err := json.NewDecoder(r.Body).Decode(&status); err != nil {
+		http.Error(w, "Invalid JSON", http.StatusBadRequest)
+		return
+	}
+
+	status.LastHeartbeat = time.Now()
+
+	s.mutex.Lock()
+	s.nodes[status.NodeID] = &status
+	s.mutex.Unlock()
+
+	log.Printf("Received report from node: %s", status.NodeID)
+	w.WriteHeader(http.StatusOK)
+}
+
+func (s *Server) handleNodes(w http.ResponseWriter, r *http.Request) {
+	s.mutex.RLock()
+	nodes := make([]*types.NodeStatus, 0, len(s.nodes))
+	for _, node := range s.nodes {
+		nodes = append(nodes, node)
+	}
+	s.mutex.RUnlock()
+
+	// Sort by node ID
+	sort.Slice(nodes, func(i, j int) bool {
+		return nodes[i].NodeID < nodes[j].NodeID
+	})
+
+	tmpl := `
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Node Monitor</title>
+    <style>
+        table { border-collapse: collapse; width: 100%; }
+        th, td { border: 1px solid #ddd; padding: 8px; text-align: left; }
+        th { background-color: #f2f2f2; }
+        .offline { background-color: #ffebee; }
+        .online { background-color: #e8f5e8; }
+    </style>
+</head>
+<body>
+    <h1>Node Monitor Dashboard</h1>
+    <p>Last updated: {{.UpdateTime}}</p>
+    <table>
+        <tr>
+            <th>Node ID</th>
+            <th>Status</th>
+			<th>Height</th>
+            <th>CPU Usage (%)</th>
+            <th>Memory Usage (%)</th>
+            <th>Memory (Free/Total)</th>
+            <th>Disk Usage (%)</th>
+            <th>Disk (Free/Total)</th>
+            <th>Private IP</th>
+            <th>Public IP</th>
+            <th>Last Report</th>
+        </tr>
+        {{range .Nodes}}
+        <tr class="{{.StatusClass}}">
+            <td>{{.NodeID}}</td>
+            <td>{{.Status}}</td>
+			<td>{{.Height}}</td>
+            <td>{{printf "%.2f" .CPUUsage}}</td>
+            <td>{{printf "%.2f" .MemoryUsage}}</td>
+            <td>{{.MemoryInfo}}</td>
+            <td>{{printf "%.2f" .DiskUsage}}</td>
+            <td>{{.DiskInfo}}</td>
+            <td>{{.PrivateIP}}</td>
+            <td>{{.PublicIP}}</td>
+            <td>{{.LastReport}}</td>
+        </tr>
+        {{end}}
+    </table>
+</body>
+</html>
+`
+
+	type NodeView struct {
+		*types.NodeStatus
+		Status      string
+		StatusClass string
+		MemoryInfo  string
+		DiskInfo    string
+		LastReport  string
+	}
+
+	nodeViews := make([]NodeView, len(nodes))
+	for i, node := range nodes {
+		isOnline := time.Since(node.LastHeartbeat) < 30*time.Second
+		status := "Online"
+		statusClass := "online"
+		if !isOnline {
+			status = "Offline"
+			statusClass = "offline"
+		}
+
+		nodeViews[i] = NodeView{
+			NodeStatus:  node,
+			Status:      status,
+			StatusClass: statusClass,
+			MemoryInfo:  fmt.Sprintf("%.2f GB / %.2f GB", float64(node.MemoryFree)/(1024*1024*1024), float64(node.MemoryTotal)/(1024*1024*1024)),
+			DiskInfo:    fmt.Sprintf("%.2f GB / %.2f GB", float64(node.DiskFree)/(1024*1024*1024), float64(node.DiskTotal)/(1024*1024*1024)),
+			LastReport:  node.Timestamp.Format("2006-01-02 15:04:05"),
+		}
+	}
+
+	data := struct {
+		Nodes      []NodeView
+		UpdateTime string
+	}{
+		Nodes:      nodeViews,
+		UpdateTime: time.Now().Format("2006-01-02 15:04:05"),
+	}
+
+	t, err := template.New("nodes").Parse(tmpl)
+	if err != nil {
+		http.Error(w, "Template error", http.StatusInternalServerError)
+		return
+	}
+
+	w.Header().Set("Content-Type", "text/html")
+	if err := t.Execute(w, data); err != nil {
+		http.Error(w, "Template execution error", http.StatusInternalServerError)
+		return
+	}
+}
+
+func main() {
+	flag.Parse()
+
+	server := NewServer()
+
+	http.HandleFunc("/api/report", server.handleReport)
+	http.HandleFunc("/", server.handleNodes)
+
+	log.Printf("Server starting on port %s", *port)
+	log.Fatal(http.ListenAndServe(":"+*port, nil))
+}

types/types.go

+package types
+
+import "time"
+
+// NodeStatus represents the status information of a node
+type NodeStatus struct {
+	NodeID        string    `json:"node_id"`
+	CPUUsage      float64   `json:"cpu_usage"`      // CPU usage percentage
+	MemoryUsage   float64   `json:"memory_usage"`   // Memory usage percentage
+	MemoryTotal   uint64    `json:"memory_total"`   // Total memory in bytes
+	MemoryFree    uint64    `json:"memory_free"`    // Free memory in bytes
+	DiskUsage     float64   `json:"disk_usage"`     // Disk usage percentage
+	DiskTotal     uint64    `json:"disk_total"`     // Total disk space in bytes
+	DiskFree      uint64    `json:"disk_free"`      // Free disk space in bytes
+	PrivateIP     string    `json:"private_ip"`     // Internal IP address
+	PublicIP      string    `json:"public_ip"`      // External IP address
+	Height        string    `json:"height"`         // Node height (e.g., blockchain height)
+	Timestamp     time.Time `json:"timestamp"`      // Report timestamp
+	LastHeartbeat time.Time `json:"last_heartbeat"` // Last heartbeat time
+}