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package main
// A note on the origin of the name.
// http://en.wikipedia.org/wiki/Barak
// TODO: Nonrepudiable command log
import (
"errors"
"flag"
"fmt"
"io"
"net/http"
"os"
"reflect"
"time"
"github.com/tendermint/tendermint/binary"
. "github.com/tendermint/tendermint/cmd/barak/types"
. "github.com/tendermint/tendermint/common"
cfg "github.com/tendermint/tendermint/config"
pcm "github.com/tendermint/tendermint/process"
"github.com/tendermint/tendermint/rpc/server"
)
const BarakVersion = "0.0.1"
var Routes map[string]*rpcserver.RPCFunc
func init() {
Routes = map[string]*rpcserver.RPCFunc{
"status": rpcserver.NewRPCFunc(Status, []string{}),
"run": rpcserver.NewRPCFunc(Run, []string{"auth_command"}),
// NOTE: also, two special non-JSONRPC routes called "download" and "upload"
}
}
// Global instance
var barak_ *Barak
// Parse command-line options
func parseFlags() (optionsFile string) {
flag.StringVar(&optionsFile, "config", "", "Read config from file instead of stdin")
flag.Parse()
return
}
func main() {
fmt.Printf("New Barak Process (PID: %d)\n", os.Getpid())
// Apply bare tendermint/* configuration.
cfg.ApplyConfig(cfg.MapConfig(map[string]interface{}{"log_level": "info"}))
// Read options
optionsFile := parseFlags()
options := ReadBarakOptions(optionsFile)
// Init barak
barak_ = NewBarakFromOptions(options)
barak_.StartRegisterRoutine()
barak_.WritePidFile() // This should be last, before TrapSignal().
TrapSignal(func() {
fmt.Println("Barak shutting down")
})
}
//------------------------------------------------------------------------------
// RPC functions
func Status() (*ResponseStatus, error) {
barak_.mtx.Lock()
pid := barak_.pid
nonce := barak_.nonce
validators := barak_.validators
barak_.mtx.Unlock()
return &ResponseStatus{
Version: BarakVersion,
Pid: pid,
Nonce: nonce,
Validators: validators,
}, nil
}
func Run(authCommand AuthCommand) (interface{}, error) {
command, err := parseValidateCommand(authCommand)
if err != nil {
return nil, err
}
log.Info(Fmt("Run() received command %v:%v", reflect.TypeOf(command), command))
// Issue command
switch c := command.(type) {
case CommandStartProcess:
return StartProcess(c.Wait, c.Label, c.ExecPath, c.Args, c.Input)
case CommandStopProcess:
return StopProcess(c.Label, c.Kill)
case CommandListProcesses:
return ListProcesses()
case CommandOpenListener:
return OpenListener(c.Addr)
case CommandCloseListener:
return CloseListener(c.Addr)
case CommandQuit:
return Quit()
default:
return nil, errors.New("Invalid endpoint for command")
}
}
func parseValidateCommandStr(authCommandStr string) (Command, error) {
var err error
authCommand := binary.ReadJSON(AuthCommand{}, []byte(authCommandStr), &err).(AuthCommand)
if err != nil {
fmt.Printf("Failed to parse auth_command")
return nil, errors.New("AuthCommand parse error")
}
return parseValidateCommand(authCommand)
}
func parseValidateCommand(authCommand AuthCommand) (Command, error) {
commandJSONStr := authCommand.CommandJSONStr
signatures := authCommand.Signatures
// Validate commandJSONStr
if !validate([]byte(commandJSONStr), barak_.ListValidators(), signatures) {
fmt.Printf("Failed validation attempt")
return nil, errors.New("Validation error")
}
// Parse command
var err error
command := binary.ReadJSON(NoncedCommand{}, []byte(commandJSONStr), &err).(NoncedCommand)
if err != nil {
fmt.Printf("Failed to parse command")
return nil, errors.New("Command parse error")
}
// Prevent replays
barak_.CheckIncrNonce(command.Nonce)
return command.Command, nil
}
//------------------------------------------------------------------------------
// RPC base commands
// WARNING Not validated, do not export to routes.
func StartProcess(wait bool, label string, execPath string, args []string, input string) (*ResponseStartProcess, error) {
// First, see if there already is a process labeled 'label'
existing := barak_.GetProcess(label)
if existing != nil && existing.EndTime.IsZero() {
return nil, fmt.Errorf("Process already exists: %v", label)
}
// Otherwise, create one.
err := EnsureDir(barak_.RootDir() + "/outputs")
if err != nil {
return nil, fmt.Errorf("Failed to create outputs dir: %v", err)
}
outPath := Fmt("%v/outputs/%v_%v.out", barak_.RootDir(), label, time.Now().Format("2006_01_02_15_04_05_MST"))
proc, err := pcm.Create(pcm.ProcessModeDaemon, label, execPath, args, input, outPath)
if err != nil {
return nil, err
}
barak_.AddProcess(label, proc)
if wait {
<-proc.WaitCh
output := pcm.ReadOutput(proc)
// fmt.Println("Read output", output)
if proc.ExitState == nil {
return &ResponseStartProcess{
Success: true,
Output: output,
}, nil
} else {
return &ResponseStartProcess{
Success: proc.ExitState.Success(), // Would be always false?
Output: output,
}, nil
}
} else {
return &ResponseStartProcess{
Success: true,
Output: "",
}, nil
}
}
func StopProcess(label string, kill bool) (*ResponseStopProcess, error) {
err := barak_.StopProcess(label, kill)
return &ResponseStopProcess{}, err
}
func ListProcesses() (*ResponseListProcesses, error) {
procs := barak_.ListProcesses()
return &ResponseListProcesses{
Processes: procs,
}, nil
}
func OpenListener(addr string) (*ResponseOpenListener, error) {
listener, err := barak_.OpenListener(addr)
if err != nil {
return nil, err
}
return &ResponseOpenListener{
Addr: listener.Addr().String(),
}, nil
}
func CloseListener(addr string) (*ResponseCloseListener, error) {
barak_.CloseListener(addr)
return &ResponseCloseListener{}, nil
}
func Quit() (*ResponseQuit, error) {
fmt.Println("Barak shutting down due to Quit()")
go func() {
time.Sleep(time.Second)
os.Exit(0)
}()
return &ResponseQuit{}, nil
}
//--------------------------------------------------------------------------------
// Another barak instance registering its external
// address to a remote barak.
func RegisterHandler(w http.ResponseWriter, req *http.Request) {
registry, err := os.OpenFile(barak_.RootDir()+"/registry.log", os.O_RDWR|os.O_APPEND|os.O_CREATE, 0600)
if err != nil {
http.Error(w, "Could not open registry file. Please contact the administrator", 500)
return
}
// TODO: Also check the X-FORWARDED-FOR or whatever it's called.
registry.Write([]byte(Fmt("++ %v\n", req.RemoteAddr)))
registry.Close()
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(200)
w.Write([]byte("Noted!"))
}
func ServeFileHandler(w http.ResponseWriter, req *http.Request) {
authCommandStr := req.FormValue("auth_command")
command, err := parseValidateCommandStr(authCommandStr)
if err != nil {
http.Error(w, Fmt("Invalid command: %v", err), 400)
}
serveCommand, ok := command.(CommandServeFile)
if !ok {
http.Error(w, "Invalid command", 400)
}
path := serveCommand.Path
if path == "" {
http.Error(w, "Must specify path", 400)
return
}
if path[0] == '.' {
// local paths must be explicitly local, e.g. "./xyz"
} else if path[0] != '/' {
// If not an absolute path, then is label
proc := barak_.GetProcess(path)
if proc == nil {
http.Error(w, Fmt("Unknown process label: %v", path), 400)
return
}
path = proc.OutputPath
}
file, err := os.Open(path)
if err != nil {
http.Error(w, Fmt("Error opening file: %v. %v", path, err), 400)
return
}
_, err = io.Copy(w, file)
if err != nil {
fmt.Fprintf(os.Stderr, Fmt("Error serving file: %v. %v", path, err))
return
}
}