open-falcon-agent源码学习
最近学习falcon,看了源码和极客学院的视频解析,画了调用结构、关系,对主要的代码进行了注释
代码地址:https://github.com/beyondskyw...
标签(空格分隔): falcon go
监控数据
机器性能指标:cpu,mem,网卡,磁盘……
业务监控
开源软件状态:Nginx,Redis,MySQL
snmp采集网络设备指标
设计原理
自发现采集值
不同类型数据采集分不同goroutine
进程和端口通过用户配置进行监控
配置文件
hostname和ip默认留空,agent自动探测
hbs和transfer都是配置其rpc地址
collector网卡采集前缀
ignore为true时取消上报
组织结构
cron:间隔执行的代码,即定时任务
funcs:信息采集
g:全局数据结构
http:简单的dashboard的server,获取单机监控指标数据
plugins:插件处理机制
public:静态资源文件
心跳机制
了解agent、plugin版本信息,方便升级
获取监听的进程和端口
获取本机执行的插件列表
与HBS、Transfer交互
调用关系
代码解读
- main入口
go cron.InitDataHistory()// 上报本机状态cron.ReportAgentStatus()// 同步插件cron.SyncMinePlugins()// 同步监控端口、路径、进程和URLcron.SyncBuiltinMetrics()// 后门调试agent,允许执行shell指令的ip列表cron.SyncTrustableIps()// 开始数据次采集cron.Collect()// 启动dashboard servergo http.Start()
- ReportAgentStatus:汇报agent本身状态
// 判断hbs配置是否正常,正常则上报agent状态if g.Config().Heartbeat.Enabled && g.Config().Heartbeat.Addr != "" { // 根据配置的interval间隔上报信息 go reportAgentStatus(time.Duration(g.Config().Heartbeat.Interval) * time.Second)}func reportAgentStatus(interval time.Duration) { for { // 获取hostname, 出错则错误赋值给hostname hostname, err := g.Hostname() if err != nil { hostname = fmt.Sprintf("error:%s", err.Error()) } // 请求发送信息 req := model.AgentReportRequest{ Hostname: hostname, IP: g.IP(), AgentVersion: g.VERSION, // 通过shell指令获取plugin版本,能否go实现 PluginVersion: g.GetCurrPluginVersion(), } var resp model.SimpleRpcResponse // 调用rpc接口 err = g.HbsClient.Call("Agent.ReportStatus", req, &resp) if err != nil || resp.Code != 0 { log.Println("call Agent.ReportStatus fail:", err, "Request:", req, "Response:", resp) } time.Sleep(interval) }}
- SyncMinePlugins:同步插件
func syncMinePlugins() { var ( timestamp int64 = -1 pluginDirs []string ) duration := time.Duration(g.Config().Heartbeat.Interval) * time.Second for { time.Sleep(duration) hostname, err := g.Hostname() if err != nil { continue } req := model.AgentHeartbeatRequest{ Hostname: hostname, } var resp model.AgentPluginsResponse // 调用rpc接口,返回plugin err = g.HbsClient.Call("Agent.MinePlugins", req, &resp) if err != nil { log.Println("ERROR:", err) continue } // 保证时间顺序正确 if resp.Timestamp 1. SyncBuiltinMetrics:同步内置metric,包括端口、目录和进程信息
func syncBuiltinMetrics() {
var timestamp int64 = -1
var checksum string = "nil"
duration := time.Duration(g.Config().Heartbeat.Interval) * time.Secondfor { time.Sleep(duration) // 监控端口、目录大小、进程 var ports = []int64{} var paths = []string{} var procs = make(map[string]map[int]string) var urls = make(map[string]string) hostname, err := g.Hostname() if err != nil { continue } req := model.AgentHeartbeatRequest{ Hostname: hostname, Checksum: checksum, } var resp model.BuiltinMetricResponse err = g.HbsClient.Call("Agent.BuiltinMetrics", req, &resp) if err != nil { log.Println("ERROR:", err) continue } if resp.Timestamp 1. SyncTrustableIps:同步可信IP列表
请求获取远程访问执行shell命令的IP白名单,在通过http/run.go调用shell命令是会判断请求IP是否可信
func syncTrustableIps() { duration := time.Duration(g.Config().Heartbeat.Interval) * time.Second for { time.Sleep(duration) var ips string err := g.HbsClient.Call("Agent.TrustableIps", model.NullRpcRequest{}, &ips) if err != nil { log.Println("ERROR: call Agent.TrustableIps fail", err) continue } // 设置到本地可信IP列表 g.SetTrustableIps(ips) }}
- FuncsAndInterval:拆分不同的采集函数集,方便通过不同goroutine运行
// 间隔internal时间执行fs中的函数type FuncsAndInterval struct { Fs []func() []*model.MetricValue Interval int}var Mappers []FuncsAndInterval// 根据调用指令类型和是否容易被挂起而分类(通过不同的goroutine去执行,避免相互之间的影响)func BuildMappers() { interval := g.Config().Transfer.Interval Mappers = []FuncsAndInterval{ FuncsAndInterval{ Fs: []func() []*model.MetricValue{ AgentMetrics, CpuMetrics, NetMetrics, KernelMetrics, LoadAvgMetrics, MemMetrics, DiskIOMetrics, IOStatsMetrics, NetstatMetrics, ProcMetrics, UdpMetrics, }, Interval: interval, }, // 容易出问题 FuncsAndInterval{ Fs: []func() []*model.MetricValue{ DeviceMetrics, }, Interval: interval, }, // 调用相同指令 FuncsAndInterval{ Fs: []func() []*model.MetricValue{ PortMetrics, SocketStatSummaryMetrics, }, Interval: interval, }, FuncsAndInterval{ Fs: []func() []*model.MetricValue{ DuMetrics, }, Interval: interval, }, FuncsAndInterval{ Fs: []func() []*model.MetricValue{ UrlMetrics, }, Interval: interval, }, }}
- Colleet:配置信息读取,读取Mapper中的FuncsAndInterval,根据func调用采集函数,采集所有信息(并非先过滤采集项),从所有采集到的数据中过滤ignore的项,并上报到transfer。
func Collect() { // 配置信息判断 if !g.Config().Transfer.Enabled { return } if len(g.Config().Transfer.Addrs) == 0 { return } // 读取mapper中的FuncsAndInterval集,并通过不同的goroutine运行 for _, v := range funcs.Mappers { go collect(int64(v.Interval), v.Fs) }}// 间隔采集信息func collect(sec int64, fns []func() []*model.MetricValue) { // 启动断续器,间隔执行 t := time.NewTicker(time.Second * time.Duration(sec)).C for { 1. 采集信息结构
type MetricValue struct {
Endpoint string // 主机名
Metric string // 信息标识cpu.idle、mem.memtotal等
Value interface{} // 采集结果
Step int64 // 该项上报间隔
Type string // GAUGE或COUNTER
Tags string // 配置报警策略
Timestamp int64 // 此次上报时间
}
1. 采集信息组成metricValue结构
func NewMetricValue(metric string, val interface{}, dataType string, tags ...string) *model.MetricValue {
mv := model.MetricValue{
Metric: metric,
Value: val,
Type: dataType,
}
size := len(tags)if size > 0 { mv.Tags = strings.Join(tags, ",")}return &mv
}
// 原值类型
func GaugeValue(metric string, val interface{}, tags ...string) *model.MetricValue {
return NewMetricValue(metric, val, "GAUGE", tags...)
}
// 计数器类型
func CounterValue(metric string, val interface{}, tags ...string) *model.MetricValue {
return NewMetricValue(metric, val, "COUNTER", tags...)
}
1. rpc组件
// 简单封装rpc.Cilent
type SingleConnRpcClient struct {
sync.Mutex
rpcClient *rpc.Client
RpcServer string
Timeout time.Duration
}
// 关闭rpc
func (this *SingleConnRpcClient) close() {
if this.rpcClient != nil {
this.rpcClient.Close()
this.rpcClient = nil
}
}
// 保证rpc存在,为空则重新创建, 如果server宕机, 死循环????
func (this *SingleConnRpcClient) insureConn() {
if this.rpcClient != nil {
return
}
var err errorvar retry int = 1for { if this.rpcClient != nil { return } // 根据timeout和server地址去连接rpc的server this.rpcClient, err = net.JsonRpcClient("tcp", this.RpcServer, this.Timeout) if err == nil { return } log.Printf("dial %s fail: %v", this.RpcServer, err) if retry > 6 { retry = 1 } time.Sleep(time.Duration(math.Pow(2.0, float64(retry))) * time.Second) retry++}
}
// rpc client调用hbs函数
func (this *SingleConnRpcClient) Call(method string, args interface{}, reply interface{}) error {
// 加锁保证一个agent只与server有一个连接,保证性能
this.Lock()
defer this.Unlock()
// 保证rpc连接可用
this.insureConn()
timeout := time.Duration(50 * time.Second)done := make(chan error)go func() { err := this.rpcClient.Call(method, args, reply) done %v", this.rpcClient, this.RpcServer) this.close()case err := 1. Transfer部件
// 定义transfer的rpcClient对应Map, transferClients读写锁var ( TransferClientsLock *sync.RWMutex = new(sync.RWMutex) TransferClients map[string]*SingleConnRpcClient = map[string]*SingleConnRpcClient{})// 发送数据到随机的transferfunc SendMetrics(metrics []*model.MetricValue, resp *model.TransferResponse) { rand.Seed(time.Now().UnixNano()) // 随机transferClient发送数据,直到发送成功 for _, i := range rand.Perm(len(Config().Transfer.Addrs)) { addr := Config().Transfer.Addrs[i] if _, ok := TransferClients[addr]; !ok { initTransferClient(addr) } if updateMetrics(addr, metrics, resp) { break } }}// 初始化addr对应的transferClientfunc initTransferClient(addr string) { TransferClientsLock.Lock() defer TransferClientsLock.Unlock() TransferClients[addr] = &SingleConnRpcClient{ RpcServer: addr, Timeout: time.Duration(Config().Transfer.Timeout) * time.Millisecond, }}// 调用rpc接口发送metricfunc updateMetrics(addr string, metrics []*model.MetricValue, resp *model.TransferResponse) bool { TransferClientsLock.RLock() defer TransferClientsLock.RUnlock() err := TransferClients[addr].Call("Transfer.Update", metrics, resp) if err != nil { log.Println("call Transfer.Update fail", addr, err) return false } return true}
- 采集插件同步
// 插件信息: 路径、修改时间、运行周期(来自plugin插件)type Plugin struct { FilePath string MTime int64 Cycle int}// 插件map和调度器mapvar ( Plugins = make(map[string]*Plugin) PluginsWithScheduler = make(map[string]*PluginScheduler))// 删除不需要的pluginfunc DelNoUsePlugins(newPlugins map[string]*Plugin) { for currKey, currPlugin := range Plugins { newPlugin, ok := newPlugins[currKey] if !ok || currPlugin.MTime != newPlugin.MTime { deletePlugin(currKey) } }}// 添加同步时增加的pluginfunc AddNewPlugins(newPlugins map[string]*Plugin) { for fpath, newPlugin := range newPlugins { // 去除重复插件 if _, ok := Plugins[fpath]; ok && newPlugin.MTime == Plugins[fpath].MTime { continue } // 为新添加的插件新建调度器 Plugins[fpath] = newPlugin sch := NewPluginScheduler(newPlugin) PluginsWithScheduler[fpath] = sch // 启动plugin调度 sch.Schedule() }}func ClearAllPlugins() { for k := range Plugins { deletePlugin(k) }}func deletePlugin(key string) { v, ok := PluginsWithScheduler[key] if ok { // 暂停调度plugin v.Stop() delete(PluginsWithScheduler, key) } delete(Plugins, key)}
- 插件调度策略
// 持续间隔执行plugintype PluginScheduler struct { Ticker *time.Ticker Plugin *Plugin Quit chan struct{}}// 根据plugin创建新的schedulefunc NewPluginScheduler(p *Plugin) *PluginScheduler { scheduler := PluginScheduler{Plugin: p} scheduler.Ticker = time.NewTicker(time.Duration(p.Cycle) * time.Second) scheduler.Quit = make(chan struct{}) return &scheduler}// plugin调度,间隔执行PluginRun,除非收到quit消息func (this *PluginScheduler) Schedule() { go func() { for { select { case <-this.Ticker.C: PluginRun(this.Plugin) case <-this.Quit: this.Ticker.Stop() return } } }()}// 停止plugin调度func (this *PluginScheduler) Stop() { close(this.Quit)}// 执行插件,读取插件运行返回数据并上报transferfunc PluginRun(plugin *Plugin) { timeout := plugin.Cycle*1000 - 500 fpath := filepath.Join(g.Config().Plugin.Dir, plugin.FilePath) if !file.IsExist(fpath) { log.Println("no such plugin:", fpath) return } debug := g.Config().Debug if debug { log.Println(fpath, "running...") } cmd := exec.Command(fpath) var stdout bytes.Buffer cmd.Stdout = &stdout var stderr bytes.Buffer cmd.Stderr = &stderr cmd.Start() err, isTimeout := sys.CmdRunWithTimeout(cmd, time.Duration(timeout)*time.Millisecond) errStr := stderr.String() if errStr != "" { logFile := filepath.Join(g.Config().Plugin.LogDir, plugin.FilePath+".stderr.log") if _, err = file.WriteString(logFile, errStr); err != nil { log.Printf("[ERROR] write log to %s fail, error: %s\n", logFile, err) } } if isTimeout { // has be killed if err == nil && debug { log.Println("[INFO] timeout and kill process", fpath, "successfully") } if err != nil { log.Println("[ERROR] kill process", fpath, "occur error:", err) } return } if err != nil { log.Println("[ERROR] exec plugin", fpath, "fail. error:", err) return } // exec successfully data := stdout.Bytes() if len(data) == 0 { if debug { log.Println("[DEBUG] stdout of", fpath, "is blank") } return } var metrics []*model.MetricValue err = json.Unmarshal(data, &metrics) if err != nil { log.Printf("[ERROR] json.Unmarshal stdout of %s fail. error:%s stdout: \n%s\n", fpath, err, stdout.String()) return } g.SendToTransfer(metrics)}
关键字:Golang, go语言
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