func main() {
flag.Parse()
logSetup()
log.Debug("using minimega: %v", *f_minimega)
// invoke minimega and get the doc json
doc, err := exec.Command(*f_minimega, "-cli").Output()
if err != nil {
log.Fatalln(err)
}
log.Debug("got doc: %v", string(doc))
// decode the JSON for our template
if err := json.Unmarshal(doc, &handlers); err != nil {
log.Fatalln(err)
}
exclude = strings.Split(*f_exclude, ",")
values = strings.Split(*f_values, ",")
for {
if err := fuzz(); err != nil {
log.Fatal("fuzz: %v", err)
}
if err := cleanup(); err != nil {
log.Fatal("cleanup: %v", err)
}
}
}
func commandHandler() {
for commands := range Client.commandChan {
var ids []int
for k, _ := range commands {
ids = append(ids, k)
}
sort.Ints(ids)
for _, id := range ids {
log.Debug("ron commandHandler: %v", id)
if id <= Client.CommandCounter {
continue
}
if !Client.Matches(commands[id].Filter) {
continue
}
log.Debug("ron commandHandler match: %v", id)
processCommand(commands[id])
}
}
log.Info("command handler exit")
}
// cliPreprocess performs expansion on a single string and returns the update
// string or an error.
func cliPreprocess(v string) (string, error) {
if u, err := url.Parse(v); err == nil {
switch u.Scheme {
case "file":
log.Debug("file preprocessor")
return iomHelper(u.Opaque)
case "http", "https":
log.Debug("http/s preprocessor")
// Check if we've already downloaded the file
v2, err := iomHelper(u.Path)
if err == nil {
return v2, err
}
if err.Error() == "file not found" {
log.Info("attempting to download %v", u)
// Try to download the file, save to files
dst := filepath.Join(*f_iomBase, u.Path)
if err := wget(v, dst); err != nil {
return "", err
}
return dst, nil
}
return "", err
}
}
return v, nil
}
// Return a slice of strings, split on whitespace, not unlike strings.Fields(),
// except that quoted fields are grouped.
// Example: a b "c d"
// will return: ["a", "b", "c d"]
func fieldsQuoteEscape(c string, input string) []string {
log.Debug("fieldsQuoteEscape splitting on %v: %v", c, input)
f := strings.Fields(input)
var ret []string
trace := false
temp := ""
for _, v := range f {
if trace {
if strings.Contains(v, c) {
trace = false
temp += " " + trimQuote(c, v)
ret = append(ret, temp)
} else {
temp += " " + v
}
} else if strings.Contains(v, c) {
temp = trimQuote(c, v)
if strings.HasSuffix(v, c) {
// special case, single word like 'foo'
ret = append(ret, temp)
} else {
trace = true
}
} else {
ret = append(ret, v)
}
}
log.Debug("generated: %#v", ret)
return ret
}
// ConnectImage exports a image using the NBD protocol using the qemu-nbd. If
// successful, returns the NBD device.
func ConnectImage(image string) (string, error) {
var nbdPath string
var err error
for i := 0; i < maxConnectRetries; i++ {
nbdPath, err = GetDevice()
if err != ErrNoDeviceAvailable {
break
}
log.Debug("all nbds in use, sleeping before retrying")
time.Sleep(time.Second * 10)
}
if err != nil {
return "", err
}
// connect it to qemu-nbd
cmd := exec.Command(process("qemu-nbd"), "-c", nbdPath, image)
log.Debug("connecting to nbd with cmd: %v", cmd)
result, err := cmd.CombinedOutput()
if err != nil {
return "", fmt.Errorf("unable to connect to nbd: %v", string(result))
}
return nbdPath, nil
}
func containerNukeWalker(path string, info os.FileInfo, err error) error {
if err != nil {
return nil
}
log.Debug("walking file: %v", path)
switch info.Name() {
case "tasks":
d, err := ioutil.ReadFile(path)
if err != nil {
return nil
}
pids := strings.Fields(string(d))
for _, pid := range pids {
log.Debug("found pid: %v", pid)
fmt.Println("killing process:", pid)
processWrapper("kill", "-9", pid)
}
}
return nil
}
func dnsClient() {
rand.Seed(time.Now().UnixNano())
t := NewEventTicker(*f_mean, *f_stddev, *f_min, *f_max)
m := new(dns.Msg)
for {
t.Tick()
h, _ := randomHost()
d := randomDomain()
var t uint16
if *f_dnsv4 {
t = dns.TypeA
} else if *f_dnsv6 {
t = dns.TypeAAAA
} else {
t = randomQuestionType()
}
m.SetQuestion(dns.Fqdn(d), t)
log.Debug("dns client: question=%v", m.Question)
in, err := dns.Exchange(m, h+addr)
if err != nil {
log.Debug(err.Error())
} else {
log.Debug("dns client: answer=%v", in)
dnsReportChan <- 1
}
}
}
// GetDevice returns the first available NBD. If there are no devices
// available, returns ErrNoDeviceAvailable.
func GetDevice() (string, error) {
// Get a list of all devices
devFiles, err := ioutil.ReadDir("/dev")
if err != nil {
return "", err
}
nbdPath := ""
// Find the first available nbd
for _, devInfo := range devFiles {
dev := devInfo.Name()
// we don't want to include partitions here
if !strings.Contains(dev, "nbd") || strings.Contains(dev, "p") {
continue
}
// check whether a pid exists for the current nbd
_, err = os.Stat(filepath.Join("/sys/block", dev, "pid"))
if err != nil {
log.Debug("found available nbd: " + dev)
nbdPath = filepath.Join("/dev", dev)
break
} else {
log.Debug("nbd %v could not be used", dev)
}
}
if nbdPath == "" {
return "", ErrNoDeviceAvailable
}
return nbdPath, nil
}
// a filename completer for goreadline that searches for the file: prefix,
// attempts to find matching files, and returns an array of candidates.
func iomCompleter(line string) []string {
f := strings.Fields(line)
if len(f) == 0 {
return nil
}
last := f[len(f)-1]
if strings.HasPrefix(last, IOM_HELPER_MATCH) {
fileprefix := strings.TrimPrefix(last, IOM_HELPER_MATCH)
matches := iom.Info(fileprefix + "*")
log.Debug("got raw matches: %v", matches)
// we need to clean up matches to collapse directories, unless
// there is a directory common prefix, in which case we
// collapse offset by the number of common directories.
dlcp := lcp(matches)
didx := strings.LastIndex(dlcp, string(filepath.Separator))
drel := ""
if didx > 0 {
drel = dlcp[:didx]
}
log.Debug("dlcp: %v, drel: %v", dlcp, drel)
if len(fileprefix) < len(drel) {
r := IOM_HELPER_MATCH + drel + string(filepath.Separator)
return []string{r, r + "0"} // hack to prevent readline from fastforwarding beyond the directory name
}
var finalMatches []string
for _, v := range matches {
if strings.Contains(v, "*") {
continue
}
r, err := filepath.Rel(drel, v)
if err != nil {
log.Errorln(err)
return nil
}
dir := filepath.Dir(r)
if dir == "." {
finalMatches = append(finalMatches, IOM_HELPER_MATCH+v)
continue
}
paths := strings.Split(dir, string(filepath.Separator))
found := false
for _, d := range finalMatches {
if d == paths[0]+string(filepath.Separator) {
found = true
break
}
}
if !found {
finalMatches = append(finalMatches, IOM_HELPER_MATCH+filepath.Join(drel, paths[0])+string(filepath.Separator))
}
}
return finalMatches
}
return nil
}
// cmdTimeout runs the command c and returns a timeout if it doesn't complete
// after time t. If a timeout occurs, cmdTimeout will kill the process.
func cmdTimeout(c *exec.Cmd, t time.Duration) error {
log.Debug("cmdTimeout: %v", c)
start := time.Now()
err := c.Start()
if err != nil {
return fmt.Errorf("cmd start: %v", err)
}
done := make(chan error)
go func() {
done <- c.Wait()
}()
select {
case <-time.After(t):
err = c.Process.Kill()
if err != nil {
return err
}
return <-done
case err = <-done:
log.Debug("cmd %v completed in %v", c, time.Now().Sub(start))
return err
}
}
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)
}
}
}
// walk every arg looking for "file:" and calling iomHelper on the suffix.
// Replace the arg with the local file if found.
func iomPreprocessor(c *minicli.Command) (*minicli.Command, error) {
for k, v := range c.StringArgs {
if strings.HasPrefix(v, IOM_HELPER_MATCH) {
file := strings.TrimPrefix(v, IOM_HELPER_MATCH)
local, err := iomHelper(file)
if err != nil {
return nil, err
}
log.Debug("iomPreProcessor: %v -> %v", v, local)
c.StringArgs[k] = local
}
}
for k, v := range c.ListArgs {
for x, y := range v {
if strings.HasPrefix(y, IOM_HELPER_MATCH) {
file := strings.TrimPrefix(y, IOM_HELPER_MATCH)
local, err := iomHelper(file)
if err != nil {
return nil, err
}
log.Debug("iomPreProcessor: %v -> %v", y, local)
c.ListArgs[k][x] = local
}
}
}
return c, nil
}
func deployRun(hosts []string, user, remotePath string, sudo bool) []error {
log.Debug("deployRun: %v, %v", hosts, user)
var errs []error
// minimega command
flags := deployGetFlags()
log.Debug("minimega flags: %v", flags)
var minimegaCommand string
if sudo {
minimegaCommand = fmt.Sprintf("sudo -b nohup %v %v > /dev/null 2>&1 &", remotePath, flags)
} else {
minimegaCommand = fmt.Sprintf("nohup %v %v > /dev/null 2>&1 &", remotePath, flags)
}
for _, host := range hosts {
command := []string{"ssh", "-o", "StrictHostKeyChecking=no"}
if user != "" {
command = append(command, fmt.Sprintf("%v@%v", user, host))
} else {
command = append(command, fmt.Sprintf("%v", host))
}
command = append(command, minimegaCommand)
log.Debug("ssh command: %v", command)
out, err := processWrapper(command...)
if err != nil {
errs = append(errs, fmt.Errorf("%v: %v", err, out))
}
}
return errs
}
// Trunk reads data from remote, constructs a *Message, and sends it using fn.
// Returns the first error.
func Trunk(remote net.Conn, uuid string, fn func(*Message) error) {
var n int
var err error
for err == nil {
buf := make([]byte, 32*1024)
n, err = remote.Read(buf)
log.Debug("trunking %v bytes for %v", n, uuid)
if err == nil {
m := &Message{
Type: MESSAGE_TUNNEL,
UUID: uuid,
Tunnel: buf[:n],
}
err = fn(m)
}
if err != nil && err != io.ErrClosedPipe {
log.Errorln(err)
}
}
if err != io.ErrClosedPipe {
log.Error("trunk failed for %v: %v", err)
}
log.Debug("trunk exit for %v", uuid)
}
func (n *Node) handleMSA(m *Message) {
log.Debug("handleMSA: %v", m)
n.meshLock.Lock()
defer n.meshLock.Unlock()
if len(n.network[m.Source]) == len(m.Body.([]string)) {
diff := false
for i, v := range n.network[m.Source] {
if m.Body.([]string)[i] != v {
diff = true
break
}
}
if !diff {
log.Debugln("MSA discarded, client data hasn't changed")
return
}
}
n.network[m.Source] = m.Body.([]string)
if log.WillLog(log.DEBUG) {
log.Debug("new network is: %v", n.network)
}
n.updateNetwork = true
}
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 unmangleUUID(uuid string) string {
// string must be in the form:
// XXXXXXXX-XXXX-XXXX-YYYY-YYYYYYYYYYYY
// the X characters are reversed at 2 byte intervals (big/little endian for a uuid?)
var ret string
re := regexp.MustCompile("[0-9a-z]{8}-[0-9a-z]{4}-[0-9a-z]{4}-[0-9a-z]{4}-[0-9a-z]{12}")
u := re.FindString(strings.ToLower(uuid))
if uuid == "" {
log.Fatal("uuid failed to match uuid format: %v", uuid)
}
log.Debug("found uuid: %v", u)
if getOSVer() != "Windows XP" {
return u
}
ret += u[6:8]
ret += u[4:6]
ret += u[2:4]
ret += u[:2]
ret += "-"
ret += u[11:13]
ret += u[9:11]
ret += "-"
ret += u[16:18]
ret += u[14:16]
ret += u[18:]
log.Debug("mangled/unmangled uuid: %v %v", u, ret)
return ret
}
// Matches tests whether all the filters match the client.
func (c *Client) Matches(f *Filter) bool {
if f == nil {
return true
}
if f.UUID != "" && f.UUID != c.UUID {
log.Debug("failed match on UUID: %v != %v", f.UUID, c.UUID)
return false
}
if f.Hostname != "" && f.Hostname != c.Hostname {
log.Debug("failed match on hostname: %v != %v", f.Hostname, c.Hostname)
return false
}
if f.Arch != "" && f.Arch != c.Arch {
log.Debug("failed match on arch: %v != %v", f.Arch, c.Arch)
return false
}
if f.OS != "" && f.OS != c.OS {
log.Debug("failed match on os: %v != %v", f.OS, c.OS)
return false
}
for k, v := range f.Tags {
if c.Tags[k] != v {
log.Debug("failed match on tag %v, %v != %v", k, v, c.Tags[k])
return false
}
}
return c.matchesIP(f) && c.matchesMAC(f)
}
func parseMega(ctx *present.Context, sourceFile string, sourceLine int, cmd string) (present.Elem, error) {
cmd = strings.TrimSpace(cmd)
log.Debug("parseMega cmd: %v", cmd)
f := strings.Fields(cmd)
if len(f) != 2 {
return nil, fmt.Errorf("invalid .mega directive: %v", cmd)
}
filename := filepath.Join(*f_root, filepath.Dir(sourceFile), f[1])
log.Debug("filename: %v", filename)
text, err := ctx.ReadFile(filename)
if err != nil {
return nil, fmt.Errorf("%s:%d: %v", sourceFile, sourceLine, err)
}
data := &megaTemplateData{
Body: string(text),
}
var buf bytes.Buffer
if err := megaTemplate.Execute(&buf, data); err != nil {
return nil, err
}
return Mega{
Text: template.HTML(buf.String()),
Filename: filepath.Base(filename),
}, nil
}
func (m *megaconn) start() {
log.Debug("got body: %v", m.body)
lines := strings.Split(m.body, "\n")
for _, v := range lines {
resp, errs := sendCommand(v)
mess := &Message{
Id: m.id,
}
if errs != "" {
mess.Kind = "stderr"
mess.Body = errs
} else {
mess.Kind = "stdout"
mess.Body = resp
}
log.Debug("generated message: %v", mess)
m.out <- mess
}
mess := &Message{
Id: m.id,
Kind: "end",
}
time.AfterFunc(msgDelay, func() { m.out <- mess })
}
func deployCopy(hosts []string, user, remotePath string) []error {
log.Debug("deployCopy: %v, %v", hosts, user)
var errs []error
minimegaBinary := fmt.Sprintf("/proc/%v/exe", os.Getpid())
log.Debug("minimega binary: %v", minimegaBinary)
for _, host := range hosts {
command := []string{"scp", "-B", "-o", "StrictHostKeyChecking=no", minimegaBinary}
if user != "" {
command = append(command, fmt.Sprintf("%v@%v:%v", user, host, remotePath))
} else {
command = append(command, fmt.Sprintf("%v:%v", host, remotePath))
}
log.Debug("scp command: %v", command)
out, err := processWrapper(command...)
if err != nil {
errs = append(errs, fmt.Errorf("%v: %v", err, out))
}
}
return errs
}
// cmdTimeout runs the command c and returns a timeout if it doesn't complete
// after time t. If a timeout occurs, cmdTimeout will kill the process. Blocks
// until the process terminates.
func cmdTimeout(c *exec.Cmd, t time.Duration) error {
log.Debug("cmdTimeout: %v", c)
start := time.Now()
if err := c.Start(); err != nil {
return fmt.Errorf("cmd start: %v", err)
}
done := make(chan error)
go func() {
done <- c.Wait()
close(done)
}()
select {
case <-time.After(t):
log.Debug("killing cmd %v", c)
err := c.Process.Kill()
// Receive from done so that we don't leave the goroutine hanging
err2 := <-done
// Kill error takes precedence as they should be unexpected
if err != nil {
return err
}
return err2
case err := <-done:
log.Debug("cmd %v completed in %v", c, time.Now().Sub(start))
return err
}
}
// Dial a client serial port. The server will maintain this connection until a
// client connects and then disconnects.
func (s *Server) DialSerial(path string) error {
log.Debug("DialSerial: %v", path)
s.serialLock.Lock()
defer s.serialLock.Unlock()
// are we already connected to this client?
if _, ok := s.serialConns[path]; ok {
return fmt.Errorf("already connected to serial client %v", path)
}
// connect!
serial, err := net.Dial("unix", path)
if err != nil {
return err
}
s.serialConns[path] = serial
go func() {
s.clientHandler(serial)
// client disconnected
s.serialLock.Lock()
defer s.serialLock.Unlock()
delete(s.serialConns, path)
log.Debug("disconnected from serial client: %v", path)
}()
return nil
}
// Starts a Ron server on the specified port
func (s *Server) Listen(port int) error {
ln, err := net.Listen("tcp", fmt.Sprintf(":%v", port))
if err != nil {
return err
}
go func() {
for {
conn, err := ln.Accept()
if err != nil {
log.Errorln(err)
return
}
log.Debug("new connection from: %v", conn.RemoteAddr())
go func() {
addr := conn.RemoteAddr()
s.clientHandler(conn)
log.Debug("disconnected from: %v", addr)
}()
}
}()
return nil
}
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
}
// 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 main() {
flag.Parse()
logSetup()
log.Debug("using minimega: %v", *f_minimega)
log.Debug("using doc template: %v", *f_template)
// invoke minimega and get the doc json
doc, err := exec.Command(*f_minimega, "-cli").Output()
if err != nil {
log.Fatalln(err)
}
log.Debug("got doc: %v", string(doc))
// decode the JSON for our template
var handlers []*minicli.Handler
err = json.Unmarshal(doc, &handlers)
if err != nil {
log.Fatalln(err)
}
// populate the apigen date for the template
year, month, day := time.Now().Date()
api := apigen{
Date: fmt.Sprintf("%v %v %v", day, month, year),
}
// populate the major sections for the template
for _, v := range handlers {
var p string
if strings.HasPrefix(v.SharedPrefix, "clear") {
p = strings.TrimPrefix(v.SharedPrefix, "clear ")
} else {
p = v.SharedPrefix
}
if strings.HasPrefix(p, ".") {
api.Builtins = append(api.Builtins, v)
} else if strings.HasPrefix(p, "mesh") {
api.Mesh = append(api.Mesh, v)
} else if strings.HasPrefix(p, "vm") {
api.VM = append(api.VM, v)
} else {
api.Host = append(api.Host, v)
}
}
// run the template and print to stdout
var out bytes.Buffer
t, err := template.ParseFiles(*f_template)
if err != nil {
log.Fatalln(err)
}
err = t.Execute(&out, api)
if err != nil {
log.Fatalln(err)
}
fmt.Println(out.String())
}
// find and record the next hop route for c.
// Additionally, all hops along this route are also the shortest path, so
// record those as well to save on effort.
func (n *Node) updateRoute(c string) {
if len(n.effectiveNetwork) == 0 {
return
}
if log.WillLog(log.DEBUG) {
log.Debug("updating route for %v", c)
}
routes := make(map[string]string) // a key node has a value of the previous hop, the key exists if it's been visited
routes[n.name] = n.name // the route to ourself is pretty easy to calculate
// dijkstra's algorithm is well suited in go - we can use a buffered
// channel of nodes to order our search. We start by putting ourselves
// in the queue (channel) and follow all nodes connected to it. If we
// haven't visited that node before, it goes in the queue.
q := make(chan string, len(n.effectiveNetwork))
q <- n.name
for len(q) != 0 {
v := <-q
if log.WillLog(log.DEBUG) {
log.Debug("visiting %v", v)
}
for _, a := range n.effectiveNetwork[v] {
if _, ok := routes[a]; !ok {
q <- a
if log.WillLog(log.DEBUG) {
log.Debug("previous hop for %v is %v", a, v)
}
routes[a] = v // this is the route to node a from v
}
}
if v == c {
break
}
}
for k, v := range routes {
curr := v
prev := k
r := k
if curr == n.name {
r += "<-" + routes[curr]
}
for curr != n.name {
prev = curr
curr = routes[curr]
r += "<-" + routes[curr]
}
if log.WillLog(log.DEBUG) {
log.Debug("full route for %v is %v", k, r)
}
n.routes[k] = prev
}
}
// 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)
}
// Send a message according to the parameters set in the message.
// Users will generally use the Set and Broadcast functions instead of Send.
// The returned error is always nil if the message type is broadcast.
// If an error is encountered, Send returns immediately.
func (n *Node) Send(m *Message) ([]string, error) {
if log.WillLog(log.DEBUG) {
log.Debug("Send: %v", m)
}
// force updating the network if needed on Send()
n.checkUpdateNetwork()
routeSlices, err := n.getRoutes(m)
if err != nil {
return nil, err
}
if log.WillLog(log.DEBUG) {
log.Debug("routeSlices: %v", routeSlices)
}
errChan := make(chan error)
for k, v := range routeSlices {
go func(client string, recipients []string) {
mOne := &Message{
Recipients: recipients,
Source: m.Source,
CurrentRoute: m.CurrentRoute,
Command: m.Command,
Body: m.Body,
}
err := n.clientSend(client, mOne)
if err != nil {
errChan <- err
} else {
errChan <- nil
}
}(k, v)
}
// wait on all of the client sends to complete
var ret string
for i := 0; i < len(routeSlices); i++ {
r := <-errChan
if r != nil {
ret += r.Error() + "\n"
}
}
// Rebuild the recipients from the routeSlices so that the caller can know
// which recipients were actually valid.
recipients := []string{}
for _, r := range routeSlices {
recipients = append(recipients, r...)
}
if ret == "" {
return recipients, nil
}
return recipients, errors.New(ret)
}