func meshageHandler() {
for {
m := <-meshageCommandChan
go func() {
mCmd := m.Body.(meshageCommand)
cmd, err := minicli.CompileCommand(mCmd.Original)
if err != nil {
log.Error("invalid command from mesh: `%s`", mCmd.Original)
return
}
resps := []minicli.Responses{}
for resp := range runCommand(cmd, true) {
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 cliRead(c *minicli.Command, respChan chan minicli.Responses) {
resp := &minicli.Response{Host: hostname}
file, err := os.Open(c.StringArgs["file"])
if err != nil {
resp.Error = err.Error()
respChan <- minicli.Responses{resp}
return
}
defer file.Close()
scanner := bufio.NewScanner(file)
for scanner.Scan() {
var cmd *minicli.Command
command := scanner.Text()
log.Debug("read command: %v", command) // commands don't have their newlines removed
cmd, err = minicli.CompileCommand(command)
if err != nil {
break
}
// No command was returned, must have been a blank line or a comment
// line. Either way, don't try to run a nil command.
if cmd == nil {
continue
}
// HAX: Make sure we don't have a recursive read command
if hasCommand(cmd, "read") {
err = errors.New("cannot run nested `read` commands")
break
}
for resp := range minicli.ProcessCommand(cmd, true) {
respChan <- resp
// Stop processing at the first error if there is one response.
// TODO: What should we do if the command was mesh send and there
// is a mixture of success and failure?
if len(resp) == 1 && resp[0].Error != "" {
break
}
}
}
if err != nil {
resp.Error = err.Error()
respChan <- minicli.Responses{resp}
}
if err := scanner.Err(); err != nil {
resp.Error = err.Error()
respChan <- minicli.Responses{resp}
}
}
func readLocalCommand(dec *json.Decoder) (*minicli.Command, error) {
var cmd minicli.Command
err := dec.Decode(&cmd)
if err != nil {
return nil, err
}
log.Debug("got command over socket: %v", cmd)
// HAX: Reprocess the original command since the Call target cannot be
// serialized... is there a cleaner way to do this?
return minicli.CompileCommand(cmd.Original)
}
func TestParseInject(t *testing.T) {
for _, cmdStr := range validInjectCommands {
cmd, err := minicli.CompileCommand(cmdStr)
if err != nil {
t.Fatalf("invalid command: %s", cmdStr)
}
inject := parseInject(cmd)
if inject.err != nil {
t.Errorf("unable to parse `%s`: %v", cmdStr, inject.err)
}
}
}
// Wrapper for minicli.ProcessCommand for commands that use meshage.
// Specifically, for `mesh send all ...`, runs the subcommand locally and
// across meshage, combining the results from the two channels into a single
// channel. This is useful if you want to get the output of a command from all
// nodes in the cluster without having to run a command locally and over
// meshage.
func runCommandGlobally(cmd *minicli.Command, record bool) chan minicli.Responses {
cmdStr := fmt.Sprintf("mesh send %s %s", Wildcard, cmd.Original)
cmd, err := minicli.CompileCommand(cmdStr)
if err != nil {
log.Fatal("cannot run `%v` globally -- %v", cmd.Original, err)
}
cmdLock.Lock()
defer cmdLock.Unlock()
var wg sync.WaitGroup
out := make(chan minicli.Responses)
// Run the command (should be `mesh send all ...` and the subcommand which
// should run locally).
ins := []chan minicli.Responses{
minicli.ProcessCommand(cmd, record),
minicli.ProcessCommand(cmd.Subcommand, record),
}
// De-mux ins into out
for _, in := range ins {
wg.Add(1)
go func(in chan minicli.Responses) {
defer wg.Done()
for v := range in {
out <- v
}
}(in)
}
// Wait until everything has been read before closing out
go func() {
wg.Wait()
close(out)
}()
return out
}
// local command line interface, wrapping readline
func cliLocal() {
prompt := "minimega$ "
for {
line, err := goreadline.Rlwrap(prompt, true)
if err != nil {
break // EOF
}
command := string(line)
log.Debug("got from stdin:", command)
cmd, err := minicli.CompileCommand(command)
if err != nil {
log.Error("%v", err)
//fmt.Printf("closest match: TODO\n")
continue
}
// No command was returned, must have been a blank line or a comment
// line. Either way, don't try to run a nil command.
if cmd == nil {
continue
}
// HAX: Don't record the read command
record := !hasCommand(cmd, "read")
for resp := range runCommand(cmd, record) {
// print the responses
pageOutput(resp.String())
errs := resp.Error()
if errs != "" {
fmt.Fprintln(os.Stderr, errs)
}
}
}
}
func webHosts(w http.ResponseWriter, r *http.Request) {
table := htmlTable{
Header: []string{},
Tabular: [][]interface{}{},
ID: "example",
Class: "hover",
}
cmd, err := minicli.CompileCommand("host")
if err != nil {
// Should never happen
log.Fatalln(err)
}
for resps := range runCommandGlobally(cmd, false) {
for _, resp := range resps {
if resp.Error != "" {
log.Errorln(resp.Error)
continue
}
if len(table.Header) == 0 && len(resp.Header) > 0 {
table.Header = append(table.Header, resp.Header...)
}
for _, row := range resp.Tabular {
res := []interface{}{}
for _, v := range row {
res = append(res, v)
}
table.Tabular = append(table.Tabular, res)
}
}
}
webRenderTemplate(w, "hosts.html", table)
}
func localCommand() {
a := flag.Args()
log.Debugln("got args:", a)
command := strings.Join(a, " ")
// TODO: Need to escape?
cmd, err := minicli.CompileCommand(command)
if err != nil {
log.Fatal(err.Error())
}
if cmd == nil {
log.Debugln("cmd is nil")
return
}
log.Infoln("got command:", cmd)
mm, err := DialMinimega()
if err != nil {
log.Fatalln(err)
}
for resp := range mm.runCommand(cmd) {
if resp.Rendered != "" {
fmt.Println(resp.Rendered)
}
errs := resp.Resp.Error()
if errs != "" {
fmt.Fprintln(os.Stderr, errs)
}
}
}
func cliAttach() {
// try to connect to the local minimega
mm, err := DialMinimega()
if err != nil {
log.Fatalln(err)
}
// set up signal handling
sig := make(chan os.Signal, 1024)
signal.Notify(sig, os.Interrupt, syscall.SIGTERM)
go func() {
<-sig
if *f_panic {
panic("teardown")
}
log.Debug("caught signal, disconnecting")
goreadline.Rlcleanup()
os.Exit(0)
}()
// start our own rlwrap
fmt.Println("CAUTION: calling 'quit' will cause the minimega daemon to exit")
fmt.Println("use 'disconnect' or ^d to exit just the minimega command line")
fmt.Println()
defer goreadline.Rlcleanup()
var exitNext bool
for {
prompt := fmt.Sprintf("minimega:%v$ ", mm.url)
line, err := goreadline.Rlwrap(prompt, true)
if err != nil {
return
}
command := string(line)
log.Debug("got from stdin: `%s`", line)
// HAX: Shortcut some commands without using minicli
if command == "disconnect" {
log.Debugln("disconnecting")
return
} else if command == "quit" {
if !exitNext {
fmt.Println("CAUTION: calling 'quit' will cause the minimega daemon to exit")
fmt.Println("If you really want to stop the minimega daemon, enter 'quit' again")
exitNext = true
continue
}
}
exitNext = false
cmd, err := minicli.CompileCommand(command)
if err != nil {
log.Error("%v", err)
//fmt.Println("closest match: TODO")
continue
}
// No command was returned, must have been a blank line or a comment
// line. Either way, don't try to run a nil command.
if cmd == nil {
continue
}
for resp := range mm.runCommand(cmd) {
pageOutput(resp.Rendered)
errs := resp.Resp.Error()
if errs != "" {
fmt.Fprintln(os.Stderr, errs)
}
}
if command == "quit" {
return
}
}
}
