Golang logs.Info函数代码示例

func monitor() {
	for event := range events {
		switch event.Status {
		case common.STATUS_DIE:
			logs.Debug("Status", event.Status, event.ID[:12], event.From)
			app.Remove(event.ID)
			reportContainerDeath(event.ID)
		case common.STATUS_START:
			logs.Debug("Status", event.Status, event.ID[:12], event.From)
			// if not in watching list, just ignore it
			if meta := getContainerMeta(event.ID); meta != nil && !app.Valid(event.ID) {
				container, err := g.Docker.InspectContainer(event.ID)
				if err != nil {
					logs.Info("Status inspect docker failed", err)
					break
				}
				eruApp := app.NewEruApp(container, meta)
				if eruApp == nil {
					logs.Info("Create EruApp failed")
					break
				}
				lenz.Attacher.Attach(&eruApp.Meta)
				app.Add(eruApp)
				reportContainerCure(event.ID)
			}
		}
	}
}

func ListenAndServe() error {
	svrConfig := InitSSHConfig()
	listener, err := net.Listen("tcp", g.Config.Bind)
	if err != nil {
		logs.Assert(err, "net.Listen failed")
	}
	defer listener.Close()

	for {
		conn, err := listener.Accept()
		if err != nil {
			logs.Assert(err, "listen.Accept failed")
		}

		sshConn := &SSHConn{conn, svrConfig}

		go func() {
			if err := sshConn.serve(); err != nil {
				logs.Info("Error occured while serving", err)
				return
			}
			logs.Info("Connection closed.")
		}()
	}
}

func setDefaultRoute(cid, gateway string, pid int) bool {
	runtime.LockOSThread()
	defer runtime.UnlockOSThread()

	origins, err := netns.Get()
	if err != nil {
		logs.Info("Get orignal namespace failed", err)
		return false
	}
	defer origins.Close()

	ns, err := netns.GetFromPid(pid)
	if err != nil {
		logs.Info("Get container namespace failed", err)
		return false
	}

	netns.Set(ns)
	defer ns.Close()
	defer netns.Set(origins)

	if err := delDefaultRoute(); err != nil {
		logs.Info("Delete default routing table failed", err)
		return false
	}

	if err := addDefaultRoute(gateway); err != nil {
		logs.Info("Add default route failed", err)
		return false
	}

	logs.Info("Set default route success", cid[:12], gateway)
	return true
}

func getContainerMeta(cid string) map[string]interface{} {
	conn := g.GetRedisConn()
	defer g.ReleaseRedisConn(conn)

	containersKey := fmt.Sprintf("eru:agent:%s:containers:meta", g.Config.HostName)
	rep, err := gore.NewCommand("HGET", containersKey, cid).Run(conn)
	if err != nil {
		logs.Info("Status get meta", err)
		return nil
	}
	var result map[string]interface{}
	if rep.IsNil() {
		return nil
	}
	if b, err := rep.Bytes(); err != nil {
		logs.Info("Status get meta", err)
		return nil
	} else {
		if err := json.Unmarshal(b, &result); err != nil {
			logs.Info("Status unmarshal meta", err)
			return nil
		}
	}
	return result
}

// URL /api/container/add/
func addNewContainer(req *Request) (int, interface{}) {
	type Data struct {
		Control     string                 `json:"control"`
		ContainerID string                 `json:"container_id"`
		Meta        map[string]interface{} `json:"meta"`
	}

	data := &Data{}
	decoder := json.NewDecoder(req.Body)
	err := decoder.Decode(data)
	if err != nil {
		return http.StatusBadRequest, JSON{"message": "wrong JSON format"}
	}

	switch data.Control {
	case "+":
		if app.Valid(data.ContainerID) {
			break
		}
		logs.Info("API status watch", data.ContainerID)
		container, err := g.Docker.InspectContainer(data.ContainerID)
		if err != nil {
			logs.Info("API status inspect docker failed", err)
			break
		}
		if eruApp := app.NewEruApp(container, data.Meta); eruApp != nil {
			lenz.Attacher.Attach(&eruApp.Meta)
			app.Add(eruApp)
		}
	}
	return http.StatusOK, JSON{"message": "ok"}
}

func addRoute(cid, CIDR, ifc string, pid int) bool {
	runtime.LockOSThread()
	defer runtime.UnlockOSThread()

	origins, err := netns.Get()
	if err != nil {
		logs.Info("Get orignal namespace failed", err)
		return false
	}
	defer origins.Close()

	ns, err := netns.GetFromPid(pid)
	if err != nil {
		logs.Info("Get container namespace failed", err)
		return false
	}

	netns.Set(ns)
	defer ns.Close()
	defer netns.Set(origins)

	if err := addRouteByLink(CIDR, ifc); err != nil {
		logs.Info("Add route failed", err)
		return false
	}

	logs.Info("Add route success", cid[:12], CIDR, ifc)
	return true
}

func (self *EruApp) Report() {
	t := time.NewTicker(self.Step)
	defer t.Stop()
	defer self.Client.Close()
	defer logs.Info(self.Name, self.EntryPoint, self.ID[:12], "metrics report stop")
	logs.Info(self.Name, self.EntryPoint, self.ID[:12], "metrics report start")
	for {
		select {
		case now := <-t.C:
			go func() {
				if info, err := self.UpdateStats(self.ID); err == nil {
					if isLimit {
						limitChan <- SoftLimit{self.ID, info}
					}
					rate := self.CalcRate(info, now)
					self.SaveLast(info)
					go self.Send(rate)
				} else {
					logs.Info("Update mertic failed", self.ID[:12])
				}
			}()
		case <-self.Stop:
			return
		}
	}
}

func setUpVLan(cid, ips string, pid int, veth netlink.Link) bool {
	runtime.LockOSThread()
	defer runtime.UnlockOSThread()

	origns, err := netns.Get()
	if err != nil {
		logs.Info("Get orignal namespace failed", err)
		return false
	}
	defer origns.Close()

	ns, err := netns.GetFromPid(pid)
	if err != nil {
		logs.Info("Get container namespace failed", err)
		return false
	}

	netns.Set(ns)
	defer ns.Close()
	defer netns.Set(origns)

	if err := BindAndSetup(veth, ips); err != nil {
		logs.Info("Bind and setup NIC failed", err)
		DelVlan(veth)
		return false
	}

	logs.Info("Add vlan device success", cid[:12])
	return true
}

func SetDefaultRoute(cid, gateway string) bool {
	_, err := g.Docker.InspectContainer(cid)
	if err != nil {
		logs.Info("VLanSetter inspect docker failed", err)
		return false
	}
	logs.Info("Set default route success", cid, gateway)
	return true
}

func AddRoute(cid, CIDR string, ifc string) bool {
	_, err := g.Docker.InspectContainer(cid)
	if err != nil {
		logs.Info("VLanSetter inspect docker failed", err)
		return false
	}
	logs.Info("Add route success", cid, CIDR, ifc)
	return true
}

func AddVlan(vethName, ips, cid string) bool {
	_, err := g.Docker.InspectContainer(cid)
	if err != nil {
		logs.Info("VLanSetter inspect docker failed", err)
		return false
	}
	logs.Info("Add VLAN device success", cid, vethName)
	return true
}

func load() {
	containers, err := g.Docker.ListContainers(docker.ListContainersOptions{All: true})
	if err != nil {
		logs.Assert(err, "List containers")
	}

	conn := g.GetRedisConn()
	defer g.ReleaseRedisConn(conn)
	containersKey := fmt.Sprintf("eru:agent:%s:containers:meta", g.Config.HostName)
	logs.Debug("Status get targets from", containersKey)
	rep, err := gore.NewCommand("HGETALL", containersKey).Run(conn)
	if err != nil {
		logs.Assert(err, "Status get targets")
	}

	if rep.IsNil() {
		return
	}

	targets, err := rep.Map()
	if err != nil {
		logs.Assert(err, "Status load targets")
	}

	logs.Debug("Status targets:", targets)
	logs.Info("Status load container")
	for _, container := range containers {
		if _, ok := targets[container.ID]; !ok {
			continue
		}

		status := getStatus(container.Status)
		if status != common.STATUS_START {
			reportContainerDeath(container.ID)
			continue
		}
		var meta map[string]interface{}
		if err := json.Unmarshal([]byte(targets[container.ID]), &meta); err != nil {
			logs.Info("Status load failed", err)
			continue
		}

		c, err := g.Docker.InspectContainer(container.ID)
		if err != nil {
			logs.Info("Status inspect docker failed", err)
			continue
		}

		if eruApp := app.NewEruApp(c, meta); eruApp != nil {
			lenz.Attacher.Attach(&eruApp.Meta)
			app.Add(eruApp)
			reportContainerCure(container.ID)
		}
	}
}

func CloseLenz() {
	logs.Info("Close all lenz streamer")
	routes, err := Router.GetAll()
	if err != nil {
		logs.Info("Get all lenz route failed", err)
		return
	}
	for _, route := range routes {
		if !Router.Remove(route.ID) {
			logs.Info("Close lenz route failed", route.ID)
		}
	}
}

// URL /api/container/:container_id/addcalico/
func addCalicoForContainer(req *Request) (int, interface{}) {
	type Endpoint struct {
		Nid     int    `json:"nid"`
		Profile string `json:"profile"`
		IP      string `json:"ip"`
		Append  bool   `json:"append"`
	}
	type Result struct {
		Succ        int    `json:"succ"`
		ContainerID string `json:"container_id"`
		IP          string `json:"ip"`
		Err         string `json:"err"`
	}

	if g.Config.VLan.Calico == "" {
		return http.StatusBadRequest, JSON{"message": "Agent not enable calico support"}
	}

	cid := req.URL.Query().Get(":container_id")
	env := os.Environ()
	env = append(env, fmt.Sprintf("ETCD_AUTHORITY=%s", g.Config.VLan.Calico))

	endpoints := []Endpoint{}
	decoder := json.NewDecoder(req.Body)
	if err := decoder.Decode(&endpoints); err != nil {
		return http.StatusBadRequest, JSON{"message": "wrong JSON format"}
	}

	rv := []Result{}
	for seq, endpoint := range endpoints {
		vethName := fmt.Sprintf("%s%d.%d", common.VLAN_PREFIX, endpoint.Nid, seq)
		if err := network.AddCalico(env, endpoint.Append, cid, vethName, endpoint.IP); err != nil {
			rv = append(rv, Result{Succ: 0, ContainerID: cid, IP: endpoint.IP, Err: err.Error()})
			logs.Info("API calico add interface failed", err)
			continue
		}

		//TODO remove when eru-core support ACL
		// currently only one profile is used
		if err := network.BindCalicoProfile(env, cid, endpoint.Profile); err != nil {
			rv = append(rv, Result{Succ: 0, ContainerID: cid, IP: endpoint.IP, Err: err.Error()})
			logs.Info("API calico add profile failed", err)
			continue
		}

		rv = append(rv, Result{Succ: 1, ContainerID: cid, IP: endpoint.IP})
	}
	return http.StatusOK, rv
}

func softOOMKill(cid string, rate float64) {
	logs.Debug("OOM killed", cid[:12])
	conn := g.GetRedisConn()
	defer g.ReleaseRedisConn(conn)

	key := fmt.Sprintf("eru:agent:%s:container:reason", cid)
	if _, err := gore.NewCommand("SET", key, common.OOM_KILLED).Run(conn); err != nil {
		logs.Info("OOM killed set flag", err)
	}
	if err := g.Docker.StopContainer(cid, 10); err != nil {
		logs.Info("OOM killed failed", cid[:12])
		return
	}
	logs.Info("OOM killed success", cid[:12])
}