Golang glog.Errorf函數代碼示例

// useDirperm checks dirperm1 mount option can be used with the current
// version of aufs.
func useDirperm() bool {
	enableDirpermLock.Do(func() {
		base, err := ioutil.TempDir("", "docker-aufs-base")
		if err != nil {
			glog.Errorf("error checking dirperm1: %s", err.Error())
			return
		}
		defer os.RemoveAll(base)

		union, err := ioutil.TempDir("", "docker-aufs-union")
		if err != nil {
			glog.Errorf("error checking dirperm1: %s", err.Error())
			return
		}
		defer os.RemoveAll(union)

		opts := fmt.Sprintf("br:%s,dirperm1,xino=/dev/shm/aufs.xino", base)
		if err := syscall.Mount("none", union, "aufs", 0, opts); err != nil {
			return
		}
		enableDirperm = true
		if err := aufsUnmount(union); err != nil {
			glog.Errorf("error checking dirperm1: failed to unmount %s", err.Error())
		}
	})
	return enableDirperm
}

// Run executes the job and blocks until the job completes.
// If the job fails it returns an error
func (job *Job) Run() (err error) {
	defer func() {
		// Wait for all background tasks to complete
		if job.closeIO {
			if err := job.Stdout.Close(); err != nil {
				glog.Errorf("%s\n", err)
			}
			if err := job.Stderr.Close(); err != nil {
				glog.Errorf("%s\n", err)
			}
			if err := job.Stdin.Close(); err != nil {
				glog.Errorf("%s\n", err)
			}
		}
	}()

	if job.Eng.IsShutdown() && !job.GetenvBool("overrideShutdown") {
		return fmt.Errorf("engine is shutdown")
	}
	// FIXME: this is a temporary workaround to avoid Engine.Shutdown
	// waiting 5 seconds for server/api.ServeApi to complete (which it never will)
	// everytime the daemon is cleanly restarted.
	// The permanent fix is to implement Job.Stop and Job.OnStop so that
	// ServeApi can cooperate and terminate cleanly.
	if job.Name != "serveapi" {
		job.Eng.l.Lock()
		job.Eng.tasks.Add(1)
		job.Eng.l.Unlock()
		defer job.Eng.tasks.Done()
	}
	// FIXME: make this thread-safe
	// FIXME: implement wait
	if !job.end.IsZero() {
		return fmt.Errorf("%s: job has already completed", job.Name)
	}
	// Log beginning and end of the job
	if job.Eng.Logging {
		glog.V(0).Infof("+job %s\n", job.CallString())
		defer func() {
			okerr := "OK"
			if err != nil {
				okerr = fmt.Sprintf("ERR: %s", err)
			}
			glog.V(0).Infof("-job %s %s\n", job.CallString(), okerr)
		}()
	}

	if job.handler == nil {
		return fmt.Errorf("%s: command not found\n", job.Name)
	}

	var errorMessage = bytes.NewBuffer(nil)
	job.Stderr.Add(errorMessage)

	err = job.handler(job)
	job.end = time.Now()

	return
}

// create and setup network bridge
func configureBridge(bridgeIP, bridgeIface string) error {
	var ifaceAddr string
	if len(bridgeIP) != 0 {
		_, _, err := net.ParseCIDR(bridgeIP)
		if err != nil {
			glog.Errorf("%s parsecidr failed\n", bridgeIP)
			return err
		}
		ifaceAddr = bridgeIP
	}

	if ifaceAddr == "" {
		return fmt.Errorf("Could not find a free IP address range for interface '%s'. Please configure its address manually", bridgeIface, bridgeIface)
	}

	if err := CreateBridgeIface(bridgeIface); err != nil {
		// The bridge may already exist, therefore we can ignore an "exists" error
		if !os.IsExist(err) {
			glog.Errorf("CreateBridgeIface failed %s %s\n", bridgeIface, ifaceAddr)
			return err
		}
	}

	iface, err := net.InterfaceByName(bridgeIface)
	if err != nil {
		return err
	}

	ipAddr, ipNet, err := net.ParseCIDR(ifaceAddr)
	if err != nil {
		return err
	}

	if ipAddr.Equal(ipNet.IP) {
		ipAddr, err = ipAllocator.RequestIP(ipNet, nil)
	} else {
		ipAddr, err = ipAllocator.RequestIP(ipNet, ipAddr)
	}

	if err != nil {
		return err
	}

	glog.V(3).Infof("Allocate IP Address %s for bridge %s\n", ipAddr, bridgeIface)

	if err := NetworkLinkAddIp(iface, ipAddr, ipNet); err != nil {
		return fmt.Errorf("Unable to add private network: %s", err)
	}

	if err := NetworkLinkUp(iface); err != nil {
		return fmt.Errorf("Unable to start network bridge: %s", err)
	}
	return nil
}

func makeHttpHandler(eng *engine.Engine, logging bool, localMethod string, localRoute string, handlerFunc HttpApiFunc, corsHeaders string, dockerVersion version.Version) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		// log the request
		glog.V(0).Infof("Calling %s %s\n", localMethod, localRoute)

		if logging {
			glog.V(1).Infof("%s %s\n", r.Method, r.RequestURI)
		}

		if strings.Contains(r.Header.Get("User-Agent"), "Docker-Client/") {
			userAgent := strings.Split(r.Header.Get("User-Agent"), "/")
			if len(userAgent) == 2 && !dockerVersion.Equal(version.Version(userAgent[1])) {
				glog.Warningf("client and server don't have the same version (client: %s, server: %s)", userAgent[1], dockerVersion)
			}
		}
		version := version.Version(mux.Vars(r)["version"])
		if version == "" {
			version = utils.APIVERSION
		}
		if corsHeaders != "" {
			writeCorsHeaders(w, r, corsHeaders)
		}

		if version.GreaterThan(utils.APIVERSION) {
			http.Error(w, fmt.Errorf("client and server don't have same version (client API version: %s, server API version: %s)", version, utils.APIVERSION).Error(), http.StatusNotFound)
			return
		}

		if err := handlerFunc(eng, version, w, r, mux.Vars(r)); err != nil {
			glog.Errorf("Handler for %s %s returned error: %s", localMethod, localRoute, err)
			httpError(w, err)
		}
	}
}

func httpError(w http.ResponseWriter, err error) {
	statusCode := http.StatusInternalServerError
	// FIXME: this is brittle and should not be necessary.
	// If we need to differentiate between different possible error types, we should
	// create appropriate error types with clearly defined meaning.
	errStr := strings.ToLower(err.Error())
	if strings.Contains(errStr, "no such") {
		statusCode = http.StatusNotFound
	} else if strings.Contains(errStr, "bad parameter") {
		statusCode = http.StatusBadRequest
	} else if strings.Contains(errStr, "conflict") {
		statusCode = http.StatusConflict
	} else if strings.Contains(errStr, "impossible") {
		statusCode = http.StatusNotAcceptable
	} else if strings.Contains(errStr, "wrong login/password") {
		statusCode = http.StatusUnauthorized
	} else if strings.Contains(errStr, "hasn't been activated") {
		statusCode = http.StatusForbidden
	}

	if err != nil {
		glog.Errorf("HTTP Error: statusCode=%d %v", statusCode, err)
		http.Error(w, err.Error(), statusCode)
	}
}

// Release an interface for a select ip
func Release(releasedIP string, maps []pod.UserContainerPort, file *os.File) error {
	file.Close()
	if err := ipAllocator.ReleaseIP(bridgeIPv4Net, net.ParseIP(releasedIP)); err != nil {
		return err
	}

	if err := ReleasePortMaps(releasedIP, maps); err != nil {
		glog.Errorf("fail to release port map %s", err)
		return err
	}
	return nil
}

func (xc *XenContext) RemoveNic(ctx *hypervisor.VmContext, device, mac string, callback hypervisor.VmEvent) {
	go func() {
		res := HyperxlNicRemove(xc.driver.Ctx, (uint32)(xc.domId), mac)
		if res == 0 {
			glog.V(1).Infof("nic %s remove succeeded", device)
			ctx.Hub <- callback
			return
		}
		glog.Errorf("nic %s remove failed", device)
		ctx.Hub <- &hypervisor.DeviceFailed{
			Session: callback,
		}
	}()
}

func GenRandomMac() (string, error) {
	const alphanum = "0123456789abcdef"
	var bytes = make([]byte, 8)
	_, err := rand.Read(bytes)

	if err != nil {
		glog.Errorf("get random number faild")
		return "", err
	}

	for i, b := range bytes {
		bytes[i] = alphanum[b%byte(len(alphanum))]
	}

	tmp := []string{"52:54", string(bytes[0:2]), string(bytes[2:4]), string(bytes[4:6]), string(bytes[6:8])}
	return strings.Join(tmp, ":"), nil
}

func (xc *XenContext) AddNic(ctx *hypervisor.VmContext, host *hypervisor.HostNicInfo, guest *hypervisor.GuestNicInfo) {
	go func() {
		callback := &hypervisor.NetDevInsertedEvent{
			Index:      guest.Index,
			DeviceName: guest.Device,
			Address:    guest.Busaddr,
		}

		glog.V(1).Infof("allocate nic %s for dom %d", host.Mac, xc.domId)
		hw, err := net.ParseMAC(host.Mac)
		if err == nil {
			//dev := fmt.Sprintf("vif%d.%d", xc.domId, guest.Index)
			dev := host.Device
			glog.V(1).Infof("add network for %d - ip: %s, br: %s, gw: %s, dev: %s, hw: %s", xc.domId, guest.Ipaddr,
				host.Bridge, host.Bridge, dev, hw.String())

			res := HyperxlNicAdd(xc.driver.Ctx, (uint32)(xc.domId), guest.Ipaddr, host.Bridge, host.Bridge, dev, []byte(hw))
			if res == 0 {

				glog.V(1).Infof("nic %s insert succeeded", guest.Device)

				err = network.UpAndAddToBridge(fmt.Sprintf("vif%d.%d", xc.domId, guest.Index))
				if err != nil {
					glog.Error("fail to add vif to bridge: ", err.Error())
					ctx.Hub <- &hypervisor.DeviceFailed{
						Session: callback,
					}
					HyperxlNicRemove(xc.driver.Ctx, (uint32)(xc.domId), host.Mac)
					return
				}

				ctx.Hub <- callback
				return
			}
			glog.V(1).Infof("nic %s insert succeeded [faked] ", guest.Device)
			ctx.Hub <- callback
			return
		}

		glog.Errorf("nic %s insert failed", guest.Device)
		ctx.Hub <- &hypervisor.DeviceFailed{
			Session: callback,
		}
	}()
}

// ServeApi loops through all of the protocols sent in to docker and spawns
// off a go routine to setup a serving http.Server for each.
func ServeApi(job *engine.Job) error {
	if len(job.Args) == 0 {
		return fmt.Errorf("usage: %s PROTO://ADDR [PROTO://ADDR ...]", job.Name)
	}
	var (
		protoAddrs = job.Args
		chErrors   = make(chan error, len(protoAddrs))
	)
	activationLock = make(chan struct{})

	for _, protoAddr := range protoAddrs {
		protoAddrParts := strings.SplitN(protoAddr, "://", 2)
		if len(protoAddrParts) != 2 {
			return fmt.Errorf("usage: %s PROTO://ADDR [PROTO://ADDR ...]", job.Name)
		}
		go func() {
			glog.V(0).Infof("Listening for HTTP on %s (%s)", protoAddrParts[0], protoAddrParts[1])
			srv, err := NewServer(protoAddrParts[0], protoAddrParts[1], job)
			if err != nil {
				chErrors <- err
				return
			}
			job.Eng.OnShutdown(func() {
				if err := srv.Close(); err != nil {
					glog.Errorf("%s\n", err)
				}
			})
			if err = srv.Serve(); err != nil && strings.Contains(err.Error(), "use of closed network connection") {
				err = nil
			}
			chErrors <- err
		}()
	}

	for i := 0; i < len(protoAddrs); i++ {
		err := <-chErrors
		if err != nil {
			return err
		}
	}

	return nil
}

func (p *PortMapper) ReleaseMap(protocol string, hostPort int) error {
	p.mutex.Lock()
	defer p.mutex.Unlock()

	var pset PortSet

	if strings.EqualFold(protocol, "udp") {
		pset = p.udpMap
	} else {
		pset = p.tcpMap
	}

	_, ok := pset[hostPort]
	if !ok {
		glog.Errorf("Host port %d has not been used", hostPort)
	}

	delete(pset, hostPort)
	return nil
}

func diskRoutine(add bool, xc *XenContext, ctx *hypervisor.VmContext,
	name, sourceType, filename, format string, id int, callback hypervisor.VmEvent) {
	backend := LIBXL_DISK_BACKEND_TAP
	if strings.HasPrefix(filename, "/dev/") {
		backend = LIBXL_DISK_BACKEND_PHY
	}
	dfmt := LIBXL_DISK_FORMAT_RAW
	if format == "qcow" || format == "qcow2" {
		dfmt = LIBXL_DISK_FORMAT_QCOW2
	}

	devName := xvdId2Name(id)
	var res int
	var op string = "insert"
	if add {
		res = HyperxlDiskAdd(xc.driver.Ctx, uint32(xc.domId), filename, devName, LibxlDiskBackend(backend), LibxlDiskFormat(dfmt))
		callback = &hypervisor.BlockdevInsertedEvent{
			Name:       name,
			SourceType: sourceType,
			DeviceName: devName,
			ScsiId:     id,
		}
	} else {
		op = "remove"
		res = HyperxlDiskRemove(xc.driver.Ctx, uint32(xc.domId), filename, devName, LibxlDiskBackend(backend), LibxlDiskFormat(dfmt))
	}
	if res == 0 {
		glog.V(1).Infof("Disk %s (%s) %s succeeded", devName, filename, op)
		ctx.Hub <- callback
		return
	}

	glog.Errorf("Disk %s (%s) insert %s failed", devName, filename, op)
	ctx.Hub <- &hypervisor.DeviceFailed{
		Session: callback,
	}
}

func UpAndAddToBridge(name string) error {
	inf, err := net.InterfaceByName(name)
	if err != nil {
		glog.Error("cannot find network interface ", name)
		return err
	}
	brg, err := net.InterfaceByName(BridgeIface)
	if err != nil {
		glog.Error("cannot find bridge interface ", BridgeIface)
		return err
	}
	err = AddToBridge(inf, brg)
	if err != nil {
		glog.Errorf("cannot add %s to %s ", name, BridgeIface)
		return err
	}
	err = NetworkLinkUp(inf)
	if err != nil {
		glog.Error("cannot up interface ", name)
		return err
	}

	return nil
}

// This function will only be invoked during daemon start
func (daemon *Daemon) AssociateAllVms() error {
	for _, mypod := range daemon.podList {
		if mypod.Vm == "" {
			continue
		}
		data, err := daemon.GetPodByName(mypod.Id)
		if err != nil {
			continue
		}
		userPod, err := pod.ProcessPodBytes(data)
		if err != nil {
			continue
		}
		glog.V(1).Infof("Associate the POD(%s) with VM(%s)", mypod.Id, mypod.Vm)
		var (
			qemuPodEvent  = make(chan hypervisor.VmEvent, 128)
			qemuStatus    = make(chan *types.QemuResponse, 128)
			subQemuStatus = make(chan *types.QemuResponse, 128)
		)
		data, err = daemon.GetVmData(mypod.Vm)
		if err != nil {
			continue
		}
		glog.V(1).Infof("The data for vm(%s) is %v", mypod.Vm, data)
		go hypervisor.VmAssociate(hypervisorDriver, mypod.Vm, qemuPodEvent,
			qemuStatus, mypod.Wg, data)
		ass := <-qemuStatus
		if ass.Code != types.E_OK {
			glog.Errorf("cannot associate with vm: %s, error status %d (%s)", mypod.Vm, ass.Code, ass.Cause)
			return errors.New("load vm status failed")
		}
		if err := daemon.SetQemuChan(mypod.Vm, qemuPodEvent, qemuStatus, subQemuStatus); err != nil {
			glog.V(1).Infof("SetQemuChan error: %s", err.Error())
			return err
		}
		vm := &Vm{
			Id:     mypod.Vm,
			Pod:    mypod,
			Status: types.S_VM_ASSOCIATED,
			Cpu:    userPod.Resource.Vcpu,
			Mem:    userPod.Resource.Memory,
		}
		daemon.AddVm(vm)
		daemon.SetContainerStatus(mypod.Id, types.S_POD_RUNNING)
		mypod.Status = types.S_POD_RUNNING
		go func(interface{}) {
			for {
				podId := mypod.Id
				qemuResponse := <-qemuStatus
				subQemuStatus <- qemuResponse
				if qemuResponse.Code == types.E_POD_FINISHED {
					data := qemuResponse.Data.([]uint32)
					daemon.SetPodContainerStatus(podId, data)
				} else if qemuResponse.Code == types.E_VM_SHUTDOWN {
					if daemon.podList[mypod.Id].Status == types.S_POD_RUNNING {
						daemon.podList[mypod.Id].Status = types.S_POD_SUCCEEDED
						daemon.SetContainerStatus(podId, types.S_POD_SUCCEEDED)
					}
					daemon.podList[mypod.Id].Vm = ""
					daemon.RemoveVm(mypod.Vm)
					daemon.DeleteQemuChan(mypod.Vm)
					if mypod.Type == "kubernetes" {
						switch mypod.Status {
						case types.S_POD_SUCCEEDED:
							if mypod.RestartPolicy == "always" {
								daemon.RestartPod(mypod)
							} else {
								daemon.DeletePodFromDB(podId)
								for _, c := range mypod.Containers {
									glog.V(1).Infof("Ready to rm container: %s", c.Id)
									if _, _, err = daemon.dockerCli.SendCmdDelete(c.Id); err != nil {
										glog.V(1).Infof("Error to rm container: %s", err.Error())
									}
								}
								//								daemon.RemovePod(podId)
								daemon.DeletePodContainerFromDB(podId)
								daemon.DeleteVolumeId(podId)
							}
							break
						case types.S_POD_FAILED:
							if mypod.RestartPolicy != "never" {
								daemon.RestartPod(mypod)
							} else {
								daemon.DeletePodFromDB(podId)
								for _, c := range mypod.Containers {
									glog.V(1).Infof("Ready to rm container: %s", c.Id)
									if _, _, err = daemon.dockerCli.SendCmdDelete(c.Id); err != nil {
										glog.V(1).Infof("Error to rm container: %s", err.Error())
									}
								}
								//								daemon.RemovePod(podId)
								daemon.DeletePodContainerFromDB(podId)
								daemon.DeleteVolumeId(podId)
							}
							break
						default:
							break
						}
					}
//.........這裏部分代碼省略.........

func (daemon *Daemon) StartPod(podId, vmId, podArgs string) (int, string, error) {
	var (
		fstype            string
		poolName          string
		volPoolName       string
		devPrefix         string
		storageDriver     string
		rootPath          string
		devFullName       string
		rootfs            string
		containerInfoList = []*hypervisor.ContainerInfo{}
		volumuInfoList    = []*hypervisor.VolumeInfo{}
		cli               = daemon.dockerCli
		qemuPodEvent      = make(chan hypervisor.VmEvent, 128)
		qemuStatus        = make(chan *types.QemuResponse, 128)
		subQemuStatus     = make(chan *types.QemuResponse, 128)
		sharedDir         = path.Join(hypervisor.BaseDir, vmId, hypervisor.ShareDirTag)
		podData           []byte
		mypod             *Pod
		wg                *sync.WaitGroup
		err               error
		uid               string
		gid               string
	)
	if podArgs == "" {
		mypod = daemon.podList[podId]
		if mypod == nil {
			return -1, "", fmt.Errorf("Can not find the POD instance of %s", podId)
		}
		podData, err = daemon.GetPodByName(podId)
		if err != nil {
			return -1, "", err
		}
		wg = mypod.Wg
	} else {
		podData = []byte(podArgs)
	}
	userPod, err := pod.ProcessPodBytes(podData)
	if err != nil {
		return -1, "", err
	}

	vm := daemon.vmList[vmId]
	if vm == nil {
		glog.V(1).Infof("The config: kernel=%s, initrd=%s", daemon.kernel, daemon.initrd)
		var (
			cpu = 1
			mem = 128
		)
		if userPod.Resource.Vcpu > 0 {
			cpu = userPod.Resource.Vcpu
		}
		if userPod.Resource.Memory > 0 {
			mem = userPod.Resource.Memory
		}
		b := &hypervisor.BootConfig{
			CPU:    cpu,
			Memory: mem,
			Kernel: daemon.kernel,
			Initrd: daemon.initrd,
			Bios:   daemon.bios,
			Cbfs:   daemon.cbfs,
		}
		go hypervisor.VmLoop(hypervisorDriver, vmId, qemuPodEvent, qemuStatus, b)
		if err := daemon.SetQemuChan(vmId, qemuPodEvent, qemuStatus, subQemuStatus); err != nil {
			glog.V(1).Infof("SetQemuChan error: %s", err.Error())
			return -1, "", err
		}

	} else {
		ret1, ret2, ret3, err := daemon.GetQemuChan(vmId)
		if err != nil {
			return -1, "", err
		}
		qemuPodEvent = ret1.(chan hypervisor.VmEvent)
		qemuStatus = ret2.(chan *types.QemuResponse)
		subQemuStatus = ret3.(chan *types.QemuResponse)
	}
	if podArgs != "" {
		wg = new(sync.WaitGroup)
		if err := daemon.CreatePod(podArgs, podId, wg); err != nil {
			glog.Error(err.Error())
			return -1, "", err
		}
		mypod = daemon.podList[podId]
	}

	storageDriver = daemon.Storage.StorageType
	if storageDriver == "devicemapper" {
		poolName = daemon.Storage.PoolName
		fstype = daemon.Storage.Fstype
		volPoolName = "hyper-volume-pool"
		devPrefix = poolName[:strings.Index(poolName, "-pool")]
		rootPath = "/var/lib/docker/devicemapper"
		rootfs = "/rootfs"
	} else if storageDriver == "aufs" {
		rootPath = daemon.Storage.RootPath
		fstype = daemon.Storage.Fstype
		rootfs = ""
	} else if storageDriver == "overlay" {
//.........這裏部分代碼省略.........