// checkDegree broadcasts connection solicitations with exponential backoff until
// the degree is met, then returns. checkDegree locks and will cause the caller to block
// until the degree is met. It should only be run as a goroutine.
func (n *Node) checkDegree() {
// check degree only if we're not already running
n.degreeLock.Lock()
defer n.degreeLock.Unlock()
var backoff uint = 1
s := rand.NewSource(time.Now().UnixNano())
r := rand.New(s)
for n.numClients() < n.degree {
log.Debugln("soliciting connections")
b := net.IPv4(255, 255, 255, 255)
addr := net.UDPAddr{
IP: b,
Port: n.port,
}
socket, err := net.DialUDP("udp4", nil, &addr)
if err != nil {
log.Error("checkDegree: %v", err)
break
}
message := fmt.Sprintf("meshage:%s:%s", n.namespace, n.name)
_, err = socket.Write([]byte(message))
socket.Close()
if err != nil {
log.Error("checkDegree: %v", err)
break
}
wait := r.Intn(1 << backoff)
time.Sleep(time.Duration(wait) * time.Second)
if backoff < 7 { // maximum wait won't exceed 128 seconds
backoff++
}
}
}
func vncClear() error {
for k, v := range vncKBRecording {
log.Debug("stopping kb recording for %v", k)
if err := v.Stop(); err != nil {
log.Error("%v", err)
}
delete(vncKBRecording, k)
}
for k, v := range vncFBRecording {
log.Debug("stopping fb recording for %v", k)
if err := v.Stop(); err != nil {
log.Error("%v", err)
}
delete(vncFBRecording, k)
}
for k, v := range vncKBPlaying {
log.Debug("stopping kb playing for %v", k)
if err := v.Stop(); err != nil {
log.Error("%v", err)
}
delete(vncKBPlaying, k)
}
return nil
}
func meshageHandler() {
for {
m := <-meshageCommandChan
go func() {
mCmd := m.Body.(meshageCommand)
cmd, err := minicli.Compile(mCmd.Original)
if err != nil {
log.Error("invalid command from mesh: `%s`", mCmd.Original)
return
}
resps := []minicli.Responses{}
for resp := range runCommand(cmd) {
resps = append(resps, resp)
}
if len(resps) > 1 || len(resps[0]) > 1 {
// This should never happen because the only commands that
// return multiple responses are `read` and `mesh send` which
// aren't supposed to be sent across meshage.
log.Error("unsure how to process multiple responses!!")
}
resp := meshageResponse{Response: *resps[0][0], TID: mCmd.TID}
recipient := []string{m.Source}
_, err = meshageNode.Set(recipient, resp)
if err != nil {
log.Errorln(err)
}
}()
}
}
func webStart(port int, root string) {
// Initialize templates
templates := filepath.Join(root, "templates")
log.Info("compiling templates from %s", templates)
web.Templates = template.New("minimega-templates")
filepath.Walk(templates, func(path string, info os.FileInfo, err error) error {
if err != nil {
log.Error("failed to load template from %s", path)
return nil
}
if !info.IsDir() && strings.HasSuffix(path, ".html") {
web.Templates.ParseFiles(path)
}
return nil
})
mux := http.NewServeMux()
for _, v := range []string{"novnc", "libs", "include"} {
path := fmt.Sprintf("/%s/", v)
dir := http.Dir(filepath.Join(root, v))
mux.Handle(path, http.StripPrefix(path, http.FileServer(dir)))
}
mux.HandleFunc("/", webVMs)
mux.HandleFunc("/map", webMapVMs)
mux.HandleFunc("/screenshot/", webScreenshot)
mux.HandleFunc("/hosts", webHosts)
mux.HandleFunc("/tags", webVMTags)
mux.HandleFunc("/tiles", webTileVMs)
mux.HandleFunc("/graph", webGraph)
mux.HandleFunc("/json", webJSON)
mux.HandleFunc("/vnc/", webVNC)
mux.HandleFunc("/ws/", vncWsHandler)
if web.Server == nil {
web.Server = &http.Server{
Addr: fmt.Sprintf(":%d", port),
Handler: mux,
}
err := web.Server.ListenAndServe()
if err != nil {
log.Error("web: %v", err)
web.Server = nil
} else {
web.Port = port
web.Running = true
}
} else {
log.Info("web: changing web root to: %s", root)
if port != web.Port && port != defaultWebPort {
log.Error("web: changing web's port is not supported")
}
// just update the mux
web.Server.Handler = mux
}
}
// Flush cleans up all resources allocated to the VM which includes all the
// network taps.
func (vm *KvmVM) Flush() error {
vm.lock.Lock()
defer vm.lock.Unlock()
for _, net := range vm.Networks {
// Handle already disconnected taps differently since they aren't
// assigned to any bridges.
if net.VLAN == DisconnectedVLAN {
if err := bridge.DestroyTap(net.Tap); err != nil {
log.Error("leaked tap %v: %v", net.Tap, err)
}
continue
}
br, err := getBridge(net.Bridge)
if err != nil {
return err
}
if err := br.DestroyTap(net.Tap); err != nil {
log.Error("leaked tap %v: %v", net.Tap, err)
}
}
return vm.BaseVM.Flush()
}
func (vms VMs) kill(target string) []error {
killedVms := map[int]bool{}
errs := expandVmTargets(target, false, func(vm VM, _ bool) (bool, error) {
if vm.GetState()&VM_KILLABLE == 0 {
return false, nil
}
if err := vm.Kill(); err != nil {
log.Error("unleash the zombie VM: %v", err)
} else {
killedVms[vm.GetID()] = true
}
return true, nil
})
outer:
for len(killedVms) > 0 {
select {
case id := <-killAck:
log.Info("VM %v killed", id)
delete(killedVms, id)
case <-time.After(COMMAND_TIMEOUT * time.Second):
log.Error("vm kill timeout")
break outer
}
}
for id := range killedVms {
log.Info("VM %d failed to acknowledge kill", id)
}
return errs
}
func (vm *ContainerVM) console(stdin, stdout, stderr *os.File) {
socketPath := filepath.Join(vm.instancePath, "console")
l, err := net.Listen("unix", socketPath)
if err != nil {
log.Error("could not start unix domain socket console on vm %v: %v", vm.ID, err)
return
}
vm.listener = l
for {
conn, err := l.Accept()
if err != nil {
if strings.Contains(err.Error(), "use of closed network connection") {
return
}
log.Error("console socket on vm %v: %v", vm.ID, err)
continue
}
log.Debug("new connection!")
go io.Copy(conn, stdout)
go io.Copy(conn, stderr)
io.Copy(stdin, conn)
log.Debug("disconnected!")
}
}
func vncClear() {
for k, v := range vncKBRecording {
if inNamespace(v.VM) {
log.Debug("stopping kb recording for %v", k)
if err := v.Stop(); err != nil {
log.Error("%v", err)
}
delete(vncKBRecording, k)
}
}
for k, v := range vncFBRecording {
if inNamespace(v.VM) {
log.Debug("stopping fb recording for %v", k)
if err := v.Stop(); err != nil {
log.Error("%v", err)
}
delete(vncFBRecording, k)
}
}
for k, v := range vncPlaying {
if inNamespace(v.VM) {
log.Debug("stopping kb playing for %v", k)
if err := v.Stop(); err != nil {
log.Error("%v", err)
}
delete(vncPlaying, k)
}
}
}
// recvFiles retrieves a list of files from the ron server by requesting each
// one individually.
func recvFiles(files []*ron.File) {
start := time.Now()
var size int64
for _, v := range files {
log.Info("requesting file %v", v)
dst := filepath.Join(*f_path, "files", v.Name)
if _, err := os.Stat(dst); err == nil {
// file exists (TODO: overwrite?)
log.Info("skipping %v -- already exists")
continue
}
m := &ron.Message{
Type: ron.MESSAGE_FILE,
UUID: Client.UUID,
Filename: v.Name,
}
if err := sendMessage(m); err != nil {
log.Error("send failed: %v", err)
return
}
resp := <-Client.fileChan
if resp.Filename != v.Name {
log.Error("filename mismatch: %v != %v", resp.Filename, v.Name)
continue
}
if resp.Error != "" {
log.Error("%v", resp.Error)
continue
}
dir := filepath.Dir(dst)
if err := os.MkdirAll(dir, os.FileMode(0770)); err != nil {
log.Errorln(err)
continue
}
if err := ioutil.WriteFile(dst, resp.File, v.Perm); err != nil {
log.Errorln(err)
continue
}
size += int64(len(resp.File))
}
d := time.Since(start)
rate := (float64(size) / 1024 / d.Seconds())
log.Debug("received %v bytes in %v (%v KBps)", size, d, rate)
return
}
// newConnection processes a new incoming connection from another node, processes the connection
// handshake, adds the connection to the client list, and starts the client message handler.
func (n *Node) newConnection(conn net.Conn) {
log.Debug("newConnection: %v", conn.RemoteAddr().String())
// are we soliciting connections?
var solicited bool
if uint(len(n.clients)) < n.degree {
solicited = true
} else {
solicited = false
}
log.Debug("solicited: %v", solicited)
c := &client{
conn: conn,
enc: gob.NewEncoder(conn),
dec: gob.NewDecoder(conn),
ack: make(chan uint64, RECEIVE_BUFFER),
}
// the handshake involves the following:
// 1. We send our name and our solicitation status
// 2a. If the connection is solicited but we're all full, the remote node simply hangs up
// 2b. If the connection is unsolicited or solicited and we are still soliciting connections, the remote node responds with its name
// 3. The connection is valid, add it to our client list and broadcast a MSA announcing the new connection.
// 4. The remote node does the same as 3.
err := c.enc.Encode(n.name)
if err != nil {
log.Error("newConnection encode name: %v: %v", n.name, err)
c.conn.Close()
return
}
err = c.enc.Encode(solicited)
if err != nil {
log.Error("newConnection encode solicited: %v: %v", n.name, err)
c.conn.Close()
return
}
var resp string
err = c.dec.Decode(&resp)
if err != nil {
if err != io.EOF {
log.Error("newConnection decode name: %v: %v", n.name, err)
}
c.conn.Close()
return
}
c.name = resp
log.Debug("handshake from: %v", c.name)
n.clientLock.Lock()
n.clients[resp] = c
n.clientLock.Unlock()
go n.clientHandler(resp)
}
func (b *Bridge) snooper() {
var (
dot1q layers.Dot1Q
eth layers.Ethernet
ip4 layers.IPv4
ip6 layers.IPv6
arp layers.ARP
)
parser := gopacket.NewDecodingLayerParser(layers.LayerTypeEthernet,
&dot1q,
ð,
&ip4,
&ip6,
&arp,
)
decodedLayers := []gopacket.LayerType{}
for {
data, _, err := b.handle.ReadPacketData()
if err != nil {
if err != io.EOF {
log.Error("error reading packet data: ", err)
}
break
}
if err := parser.DecodeLayers(data, &decodedLayers); err != nil {
if err2, ok := err.(gopacket.UnsupportedLayerType); ok {
switch gopacket.LayerType(err2) {
case layers.LayerTypeICMPv6, gopacket.LayerTypePayload:
// ignore
err = nil
default:
continue
}
}
if err != nil {
log.Error("error parsing packet: %v", err)
continue
}
}
for _, layerType := range decodedLayers {
switch layerType {
case layers.LayerTypeICMPv6:
b.updateIP(eth.SrcMAC.String(), ip6.SrcIP)
case layers.LayerTypeARP:
b.updateIP(eth.SrcMAC.String(), net.IP(arp.SourceProtAddress))
}
}
}
log.Info("%v snoop out", b.Name)
}
func nukeTap(b, tap string) {
if err := ovsDelPort(b, tap); err != nil && err != ErrNoSuchPort {
log.Error("%v, %v -- %v", b, tap, err)
}
if err := delTap(tap); err != nil {
log.Error("%v -- %v", tap, err)
}
}
// route an outgoing message to one or all clients, according to UUID
func (s *Server) route(m *Message) {
handleUUID := func(uuid string) {
c, ok := s.clients[uuid]
if !ok {
log.Error("no such client %v", uuid)
return
}
vm, ok := s.vms[uuid]
if !ok {
// The client is connected but not registered:
// * client connected before it was registered
// * client was unregistered before it disconnected
// Either way, we have to skip it since we don't know what
// namespace it belongs to.
log.Error("unregistered client %v", uuid)
return
}
// Create a copy of the Message
m2 := *m
m2.Tags = vm.GetTags()
m2.Namespace = vm.GetNamespace()
if err := c.sendMessage(&m2); err != nil {
if strings.Contains(err.Error(), "broken pipe") {
log.Debug("client disconnected: %v", uuid)
} else {
log.Info("unable to send message to %v: %v", uuid, err)
}
}
}
s.clientLock.Lock()
defer s.clientLock.Unlock()
if m.UUID != "" {
handleUUID(m.UUID)
return
}
var wg sync.WaitGroup
// send commands to all clients, in parallel
for uuid := range s.clients {
wg.Add(1)
go func(uuid string) {
defer wg.Done()
handleUUID(uuid)
}(uuid)
}
wg.Wait()
}
// clientHandler is called as a goroutine after a successful handshake. It
// begins by issuing an MSA. When the receiver exits, another MSA is issued
// without the client.
func (n *Node) clientHandler(host string) {
log.Debug("clientHandler: %v", host)
c, err := n.getClient(host)
if err != nil {
log.Error("client %v vanished -- %v", host, err)
return
}
n.MSA()
for {
var m Message
c.conn.SetReadDeadline(time.Now().Add(deadlineMultiplier * n.msaTimeout))
err := c.dec.Decode(&m)
if err != nil {
if err != io.EOF && !strings.Contains(err.Error(), "connection reset by peer") {
log.Error("client %v decode: %v", host, err)
}
break
}
if log.WillLog(log.DEBUG) {
log.Debug("decoded message: %v: %v", c.name, &m)
}
if m.Command == ACK {
c.ack <- m.ID
} else {
// send an ack
a := Message{
Command: ACK,
ID: m.ID,
}
c.conn.SetWriteDeadline(time.Now().Add(deadlineMultiplier * n.msaTimeout))
err := c.enc.Encode(a)
if err != nil {
if err != io.EOF {
log.Error("client %v encode ACK: %v", host, err)
}
break
}
n.messagePump <- &m
}
}
log.Info("client %v disconnected", host)
// client has disconnected
c.conn.Close()
n.clientLock.Lock()
delete(n.clients, c.name)
n.clientLock.Unlock()
go n.checkDegree()
n.MSA()
}
func runTests() {
mm, err := miniclient.Dial(*f_base)
if err != nil {
log.Fatal("%v", err)
}
if *f_preamble != "" {
out, err := runCommands(mm, *f_preamble)
if err != nil {
log.Fatal("%v", err)
}
log.Info(out)
}
// TODO: Should we quit minimega and restart it between each test?
//quit := mustCompile(t, "quit 2")
files, err := ioutil.ReadDir(*f_testDir)
if err != nil {
log.Fatal("%v", err)
}
for _, info := range files {
if strings.HasSuffix(info.Name(), ".want") || strings.HasSuffix(info.Name(), ".got") {
continue
}
log.Info("Running commands from %s", info.Name())
fpath := path.Join(*f_testDir, info.Name())
got, err := runCommands(mm, fpath)
if err != nil {
log.Fatal("%v", err)
}
// Record the output for offline comparison
if err := ioutil.WriteFile(fpath+".got", []byte(got), os.FileMode(0644)); err != nil {
log.Error("unable to write `%s` -- %v", fpath+".got", err)
}
want, err := ioutil.ReadFile(fpath + ".want")
if err != nil {
log.Error("unable to read file `%s` -- %v", fpath+".want", err)
continue
}
if got != string(want) {
log.Error("got != want for %s", info.Name())
}
//mm.runCommand(quit)
}
}
func webVMs(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/" {
http.NotFound(w, r)
return
}
table := htmlTable{
Header: []string{"host", "screenshot"},
Tabular: [][]interface{}{},
ID: "example",
Class: "hover",
}
table.Header = append(table.Header, vmMasks...)
stateMask := VM_QUIT | VM_ERROR
for host, vms := range globalVmInfo() {
vmLoop:
for _, vm := range vms {
var buf bytes.Buffer
if vm.GetState()&stateMask == 0 {
params := vmScreenshotParams{
Host: host,
Name: vm.GetName(),
Port: 5900 + vm.GetID(),
ID: vm.GetID(),
Size: 140,
}
if err := web.Templates.ExecuteTemplate(&buf, "fragment/screenshot", ¶ms); err != nil {
log.Error("unable to execute template screenshot -- %v", err)
continue
}
}
res := []interface{}{host, template.HTML(buf.String())}
for _, mask := range vmMasks {
if v, err := vm.Info(mask); err != nil {
log.Error("unable to get info from VM %s:%s -- %v", host, vm.GetName(), err)
continue vmLoop
} else {
res = append(res, v)
}
}
table.Tabular = append(table.Tabular, res)
}
}
webRenderTemplate(w, "table.html", table)
}
func hostid(s string) (string, int) {
k := strings.Split(s, ":")
if len(k) != 2 {
log.Error("hostid cannot split host vmid pair: %v", k)
return "", -1
}
val, err := strconv.Atoi(k[1])
if err != nil {
log.Error("parse hostid: %v", err)
return "", -1
}
return k[0], val
}
func webStart(port int, root string) {
// Initialize templates
var err error
templates := filepath.Join(root, "templates", "*.html")
log.Info("compiling templates from %s", templates)
web.Templates, err = template.ParseGlob(templates)
if err != nil {
log.Error("failed to load templates from %s", templates)
return
}
mux := http.NewServeMux()
for _, v := range []string{"novnc", "d3", "include"} {
path := fmt.Sprintf("/%s/", v)
dir := http.Dir(filepath.Join(root, v))
mux.Handle(path, http.StripPrefix(path, http.FileServer(dir)))
}
mux.HandleFunc("/", webVMs)
mux.HandleFunc("/map", webMapVMs)
mux.HandleFunc("/screenshot/", webScreenshot)
mux.HandleFunc("/hosts", webHosts)
mux.HandleFunc("/tags", webVMTags)
mux.HandleFunc("/tiles", webTileVMs)
mux.HandleFunc("/vnc/", webVNC)
mux.HandleFunc("/ws/", vncWsHandler)
if web.Server == nil {
web.Server = &http.Server{
Addr: fmt.Sprintf(":%d", port),
Handler: mux,
}
err := web.Server.ListenAndServe()
if err != nil {
log.Error("web: %v", err)
web.Server = nil
} else {
web.Port = port
web.Running = true
}
} else {
log.Info("web: changing web root to: %s", root)
if port != web.Port && port != defaultWebPort {
log.Error("web: changing web's port is not supported")
}
// just update the mux
web.Server.Handler = mux
}
}
// runCommand runs a command through a JSON pipe.
func runCommand(cmd Command) chan *localResponse {
conn, err := net.Dial("unix", path.Join(*f_minimega, "minimega"))
if err != nil {
log.Errorln(err)
return nil
}
enc := json.NewEncoder(conn)
dec := json.NewDecoder(conn)
log.Debug("encoding command: %v", cmd)
err = enc.Encode(cmd)
if err != nil {
log.Error("local command json encode: %v", err)
return nil
}
log.Debugln("encoded command:", cmd)
respChan := make(chan *localResponse)
go func() {
defer close(respChan)
for {
var r localResponse
err = dec.Decode(&r)
if err != nil {
if err == io.EOF {
log.Infoln("server disconnected")
return
}
log.Error("local command json decode: %v", err)
return
}
respChan <- &r
if !r.More {
log.Debugln("got last message")
break
} else {
log.Debugln("expecting more data")
}
}
}()
return respChan
}
func captureUpdateNFTimeouts() {
for _, b := range bridges.Names() {
br, err := getBridge(b)
if err != nil {
log.Error("could not get bridge: %v", err)
continue
}
err = br.SetNetflowTimeout(captureNFTimeout)
if err != nil && !strings.Contains(err.Error(), "has no netflow object") {
log.Error("unable to update netflow timeout: %v", err)
}
}
}
// incoming message mux. Routes messages to the correct handlers based on
// message type
func (s *Server) mux() {
for {
m := <-s.in
switch m.Type {
case MESSAGE_CLIENT:
// handle a client response
log.Debugln("ron MESSAGE_CLIENT")
s.responses <- m.Client
case MESSAGE_TUNNEL:
// handle a tunnel message
log.Debugln("ron MESSAGE_TUNNEL")
s.routeTunnel(m)
case MESSAGE_COMMAND:
// route a command to one or all clients
log.Debugln("ron MESSAGE_COMMAND")
s.route(m)
case MESSAGE_FILE:
// send a file if it exists
s.sendFile(m)
default:
log.Error("unknown message type: %v", m.Type)
return
}
}
}
// destroy all bridges
func bridgesDestroy() error {
var e []string
for k, v := range bridges {
err := v.Destroy()
if err != nil {
e = append(e, err.Error())
}
bridgeLock.Lock()
delete(bridges, k)
bridgeLock.Unlock()
}
bridgeLock.Lock()
updateBridgeInfo()
bridgeLock.Unlock()
bridgeFile := *f_base + "bridges"
err := os.Remove(bridgeFile)
if err != nil {
log.Error("bridgesDestroy: could not remove bridge file: %v", err)
}
if len(e) == 0 {
return nil
} else {
return errors.New(strings.Join(e, " : "))
}
}
// Get the VM info from all hosts optionally applying column/row filters.
// Returns a map with keys for the hostnames and values as the tabular data
// from the host.
func globalVmInfo() map[string]VMs {
cmdStr := "vm info"
res := map[string]VMs{}
cmd := minicli.MustCompile(cmdStr)
cmd.Record = false
for resps := range runCommandGlobally(cmd) {
for _, resp := range resps {
if resp.Error != "" {
log.Errorln(resp.Error)
continue
}
switch data := resp.Data.(type) {
case VMs:
res[resp.Host] = data
default:
log.Error("unknown data field in vm info")
}
}
}
return res
}
// nukeTaps removes a list of tap devices
func nukeTaps(taps []string) {
for _, t := range taps {
if err := bridge.DestroyTap(t); err != nil {
log.Error("%v -- %v", t, err)
}
}
}
// create an overlay mount (linux 3.18 or greater) is snapshot mode is
// being used.
func (vm *ContainerVM) overlayMount() error {
vm.effectivePath = filepath.Join(vm.instancePath, "fs")
workPath := filepath.Join(vm.instancePath, "fs_work")
err := os.MkdirAll(vm.effectivePath, 0755)
if err != nil {
return err
}
err = os.MkdirAll(workPath, 0755)
if err != nil {
return err
}
// create the overlay mountpoint
args := []string{
"mount",
"-t",
"overlay",
fmt.Sprintf("megamount_%v", vm.ID),
"-o",
fmt.Sprintf("lowerdir=%v,upperdir=%v,workdir=%v", vm.FSPath, vm.effectivePath, workPath),
vm.effectivePath,
}
log.Debug("mounting overlay: %v", args)
out, err := processWrapper(args...)
if err != nil {
log.Error("overlay mount: %v %v", err, out)
return err
}
return nil
}
// Walks the f_base directory and kills procs read from any qemu or
// dnsmasq pid files
func nukeWalker(path string, info os.FileInfo, err error) error {
if err != nil {
return nil
}
log.Debug("walking file: %v", path)
switch info.Name() {
case "qemu.pid", "dnsmasq.pid":
d, err := ioutil.ReadFile(path)
t := strings.TrimSpace(string(d))
log.Debug("found pid: %v", t)
if err != nil {
return err
}
args := []string{
"kill",
t,
}
log.Infoln("killing process:", t)
out, err := processWrapper(args...)
if err != nil {
log.Error("%v: %v", err, out)
}
}
return nil
}
func nukeBridges() {
for _, b := range nukeBridgeNames(false) {
if err := bridge.DestroyBridge(b); err != nil {
log.Error("%v -- %v", b, err)
}
}
}
func (vms VMs) kill(target string) []error {
killedVms := map[int]bool{}
errs := expandVmTargets(target, false, func(vm VM, _ bool) (bool, error) {
if vm.State()&(VM_QUIT|VM_ERROR) != 0 {
return false, nil
}
vm.Kill()
killedVms[vm.ID()] = true
return true, nil
})
outer:
for len(killedVms) > 0 {
select {
case id := <-killAck:
log.Info("VM %v killed", id)
delete(killedVms, id)
case <-time.After(COMMAND_TIMEOUT * time.Second):
log.Error("vm kill timeout")
break outer
}
}
for id := range killedVms {
log.Info("VM %d failed to acknowledge kill", id)
}
return errs
}
// return a file to a client requesting it via the clients GetFile() call
func (s *Server) sendFile(m *Message) {
log.Debug("ron sendFile: %v", m.Filename)
filename := filepath.Join(s.path, m.Filename)
info, err := os.Stat(filename)
if err != nil {
e := fmt.Errorf("file %v does not exist: %v", filename, err)
m.Error = e.Error()
log.Errorln(e)
} else if info.IsDir() {
e := fmt.Errorf("file %v is a directory", filename)
m.Error = e.Error()
log.Errorln(e)
} else {
// read the file
m.File, err = ioutil.ReadFile(filename)
if err != nil {
e := fmt.Errorf("file %v: %v", filename, err)
m.Error = e.Error()
log.Errorln(e)
}
}
// route this message ourselves instead of using the mux, because we
// want the type to still be FILE
s.clientLock.Lock()
defer s.clientLock.Unlock()
if c, ok := s.clients[m.UUID]; ok {
c.out <- m
} else {
log.Error("no such client %v", m.UUID)
}
}
func (n *Node) flood(m *Message) {
if log.WillLog(log.DEBUG) {
log.Debug("flood: %v", m)
}
n.clientLock.Lock()
defer n.clientLock.Unlock()
floodLoop:
for k, _ := range n.clients {
for _, j := range m.CurrentRoute {
if k == j {
continue floodLoop
}
}
go func(j string, m *Message) {
err := n.clientSend(j, m)
if err != nil {
// is j still a client?
if n.hasClient(j) {
log.Error("flood to client %v: %v", j, err)
}
}
}(k, m)
}
}
