feat: add monitoring agent (Go) + agent report API + cloud billing UI
- Go agent: CPU/mem/disk/port collectors, HTTP report, static binary - Cross-compile: linux/amd64 + linux/arm64 (statically linked) - One-line install script for all Linux distros - Backend: POST /api/v1/agent/report (no JWT) + GET /agent/latest,history (JWT) - CloudBilling.tsx: fixed syntax errors, stats/trends/records/alerts - K8s menu renamed to Kubernetes管理 Signed-off-by: Logan.Li
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// Package collector 提供服务器各项系统指标的采集能力。
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// 本文件实现监听 TCP 端口的自动发现:
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// - 扫描 /proc/net/tcp 与 /proc/net/tcp6 中状态为 LISTEN(0A) 的套接字;
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// - 通过遍历 /proc/*/fd 反查套接字 inode 归属的进程。
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//
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// 署名 Logan.Li
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package collector
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import (
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"ezops/agent/model"
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)
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// PortCollector 监听端口自动发现采集器
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type PortCollector struct{}
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// NewPortCollector 创建端口采集器实例
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func NewPortCollector() *PortCollector {
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return &PortCollector{}
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}
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// listenSocket 描述一个处于 LISTEN 状态的套接字
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type listenSocket struct {
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port int
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protocol string
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inode uint64
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}
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// procInfo 描述占用某套接字 inode 的进程信息
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type procInfo struct {
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pid int
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name string
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}
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// Collect 采集所有处于监听状态的 TCP 端口及其归属进程
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func (p *PortCollector) Collect() ([]model.PortStat, error) {
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// 1. 扫描 /proc/net/tcp(/tcp6),收集 LISTEN 套接字
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sockets := p.scanListenSockets()
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if len(sockets) == 0 {
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return []model.PortStat{}, nil
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}
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// 2. 构建 inode -> 进程信息 映射(仅 Linux 上可用)
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inodeMap := p.buildInodeMap()
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// 3. 组装结果并按 (端口, 协议, PID) 去重
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seen := make(map[string]bool)
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ports := make([]model.PortStat, 0, len(sockets))
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for _, s := range sockets {
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pid, name := 0, ""
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if info, ok := inodeMap[s.inode]; ok {
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pid, name = info.pid, info.name
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}
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key := strconv.Itoa(s.port) + "|" + s.protocol + "|" + strconv.Itoa(pid)
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if seen[key] {
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continue
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}
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seen[key] = true
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ports = append(ports, model.PortStat{
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Port: s.port,
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Protocol: s.protocol,
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Process: name,
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PID: pid,
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})
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}
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return ports, nil
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}
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// scanListenSockets 解析 /proc/net/tcp 与 /proc/net/tcp6,返回 LISTEN 套接字。
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// 单个文件读取失败(如 macOS 开发环境下不存在 /proc)会被忽略。
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func (p *PortCollector) scanListenSockets() []listenSocket {
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files := []struct {
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path string
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protocol string
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}{
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{"/proc/net/tcp", "tcp"},
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{"/proc/net/tcp6", "tcp6"},
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}
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var sockets []listenSocket
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for _, sf := range files {
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result, err := parseNetTCP(sf.path, sf.protocol)
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if err != nil {
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continue
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}
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sockets = append(sockets, result...)
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}
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return sockets
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}
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// parseNetTCP 解析单个 /proc/net/tcp(*) 文件
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func parseNetTCP(path, protocol string) ([]listenSocket, error) {
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data, err := os.ReadFile(path)
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if err != nil {
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return nil, err
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}
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var sockets []listenSocket
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lines := strings.Split(string(data), "\n")
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for i, line := range lines {
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if i == 0 {
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continue // 跳过表头
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}
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fields := strings.Fields(line)
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if len(fields) < 10 {
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continue
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}
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// fields[3] 为套接字状态,"0A" 表示 TCP_LISTEN
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if fields[3] != "0A" {
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continue
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}
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// fields[1] 为本地地址,格式 IP:Port(均为十六进制)
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localAddr := fields[1]
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colon := strings.LastIndex(localAddr, ":")
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if colon < 0 {
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continue
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}
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port, err := strconv.ParseUint(localAddr[colon+1:], 16, 32)
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if err != nil {
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continue
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}
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// fields[9] 为套接字 inode
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inode, err := strconv.ParseUint(fields[9], 10, 64)
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if err != nil {
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continue
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}
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sockets = append(sockets, listenSocket{
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port: int(port),
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protocol: protocol,
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inode: inode,
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})
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}
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return sockets, nil
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}
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// buildInodeMap 扫描 /proc/*/fd,构建 套接字 inode -> 进程信息 的映射。
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// 对无权限读取的进程目录(如其它用户进程)会自动跳过。
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func (p *PortCollector) buildInodeMap() map[uint64]procInfo {
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inodeMap := make(map[uint64]procInfo)
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entries, err := os.ReadDir("/proc")
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if err != nil {
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return inodeMap
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}
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for _, entry := range entries {
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if !entry.IsDir() {
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continue
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}
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pid, err := strconv.Atoi(entry.Name())
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if err != nil {
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continue // 非 PID 目录
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}
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fdDir := filepath.Join("/proc", entry.Name(), "fd")
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fds, err := os.ReadDir(fdDir)
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if err != nil {
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continue // 无权限读取,跳过
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}
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name := readProcessName(entry.Name())
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for _, fd := range fds {
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link, err := os.Readlink(filepath.Join(fdDir, fd.Name()))
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if err != nil {
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continue
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}
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// 套接字链接形如: socket:[12345]
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if !strings.HasPrefix(link, "socket:[") {
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continue
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}
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inodeStr := link[len("socket:[") : len(link)-1]
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inode, err := strconv.ParseUint(inodeStr, 10, 64)
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if err != nil {
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continue
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}
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// 同一 inode 仅记录首个发现的进程即可
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if _, exists := inodeMap[inode]; !exists {
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inodeMap[inode] = procInfo{pid: pid, name: name}
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}
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}
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}
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return inodeMap
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}
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// readProcessName 读取进程名称:优先 /proc/<pid>/comm,失败则尝试取 cmdline 的可执行文件名
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func readProcessName(pid string) string {
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if data, err := os.ReadFile("/proc/" + pid + "/comm"); err == nil {
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if s := strings.TrimSpace(string(data)); s != "" {
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return s
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}
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}
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if data, err := os.ReadFile("/proc/" + pid + "/cmdline"); err == nil {
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// cmdline 以 \0 分隔参数,取首个(即可执行文件路径)的基名
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parts := strings.SplitN(string(data), "\x00", 2)
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if len(parts) > 0 && parts[0] != "" {
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return filepath.Base(parts[0])
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}
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}
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return ""
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}
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