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main.go
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main.go
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// Copyright 2017-2021 National Technology & Engineering Solutions of Sandia, LLC (NTESS).
// Under the terms of Contract DE-NA0003525 with NTESS, the U.S. Government retains certain
// rights in this software.
package main
import (
"encoding/json"
"flag"
"fmt"
"io"
"net"
"os"
"path/filepath"
"strings"
"github.com/sandia-minimega/minimega/v2/internal/ron"
"github.com/sandia-minimega/minimega/v2/pkg/minicli"
log "github.com/sandia-minimega/minimega/v2/pkg/minilog"
"github.com/sandia-minimega/minimega/v2/pkg/minipager"
"github.com/peterh/liner"
)
var (
f_port = flag.Int("port", 9005, "port to listen on")
f_path = flag.String("path", "/tmp/rond", "path for files")
f_nostdin = flag.Bool("nostdin", false, "disable reading from stdin")
f_e = flag.Bool("e", false, "execute command on running rond")
)
var (
rond *ron.Server
hostname string
)
func main() {
flag.Parse()
log.Init()
if *f_e {
rond, err := Dial(filepath.Join(*f_path, "rond"))
if err != nil {
log.Fatal("unable to dial: %v", err)
}
rond.Pager = minipager.DefaultPager
// TODO: Need to escape?
cmd := strings.Join(flag.Args(), " ")
log.Info("got command: `%v`", cmd)
rond.RunAndPrint(cmd, false)
return
}
// register CLI handlers
for i := range cliHandlers {
err := minicli.Register(&cliHandlers[i])
if err != nil {
log.Fatal("invalid handler, `%v` -- %v", cliHandlers[i].HelpShort, err)
}
}
var err error
hostname, err = os.Hostname()
if err != nil {
log.Fatal("unable to get hostname: %v", hostname)
}
rond, err = ron.NewServer(*f_path, "", nil)
if err != nil {
log.Fatal("unable to create server: %v", err)
}
if err := rond.Listen(*f_port); err != nil {
log.Fatal("unable to listen: %v", err)
}
rond.UseVMs = false
if *f_nostdin {
commandSocket()
} else {
localREPL()
}
}
func localREPL() {
input := liner.NewLiner()
defer input.Close()
input.SetCtrlCAborts(true)
input.SetTabCompletionStyle(liner.TabPrints)
for {
line, err := input.Prompt("rond$ ")
if err == liner.ErrPromptAborted {
continue
} else if err == io.EOF {
break
}
log.Debug("got line from stdin: `%s`", line)
input.AppendHistory(line)
resps, err := minicli.ProcessString(line, false)
if err != nil {
log.Errorln(err)
continue
}
for resp := range resps {
minipager.DefaultPager.Page(resp.String())
errs := resp.Error()
if errs != "" {
fmt.Fprintln(os.Stderr, errs)
}
}
}
}
func commandSocket() {
l, err := net.Listen("unix", filepath.Join(*f_path, "rond"))
if err != nil {
log.Fatal("commandSocket: %v", err)
}
for {
conn, err := l.Accept()
if err != nil {
log.Error("commandSocket: accept: %v", err)
}
log.Infoln("client connected")
go func(c net.Conn) {
defer c.Close()
enc := json.NewEncoder(c)
dec := json.NewDecoder(c)
var err error
for err == nil {
var r Request
if err = dec.Decode(&r); err != nil {
log.Errorln(err)
return
}
log.Debug("got commands from socket: `%v`", r.Command)
resps, err := minicli.ProcessString(r.Command, false)
if err != nil {
log.Errorln(err)
return
}
// HAX: Work around so that we can add the more boolean.
var prev minicli.Responses
// Keep sending until we hit the first error, then just consume the
// channel to ensure that we release any locks acquired by cmd.
for resp := range resps {
if prev != nil && err == nil {
err = sendLocalResp(enc, prev, true)
} else if err != nil && len(resp) > 0 {
log.Info("dropping resp from %v", resp[0].Host)
}
prev = resp
}
if err == nil {
err = sendLocalResp(enc, prev, false)
}
}
}(conn)
}
}
func sendLocalResp(enc *json.Encoder, resp minicli.Responses, more bool) error {
r := Response{
More: more,
}
if resp != nil {
r.Resp = resp
r.Rendered = resp.String()
}
return enc.Encode(&r)
}