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209 lines
5.3 KiB
209 lines
5.3 KiB
package main
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// A note on the origin of the name.
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// http://en.wikipedia.org/wiki/Barak
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// TODO: Nonrepudiable command log
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import (
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"os"
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"reflect"
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"sync"
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"github.com/tendermint/tendermint/binary"
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. "github.com/tendermint/tendermint/cmd/barak/types"
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. "github.com/tendermint/tendermint/common"
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pcm "github.com/tendermint/tendermint/process"
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"github.com/tendermint/tendermint/rpc"
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)
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var Routes = map[string]*rpc.RPCFunc{
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"run": rpc.NewRPCFunc(Run, []string{"auth_command"}),
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// NOTE: also, two special non-JSONRPC routes called "download" and "upload"
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}
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type Options struct {
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Validators []Validator
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ListenAddress string
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StartNonce uint64
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}
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// Global instance
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var barak = struct {
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mtx sync.Mutex
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processes map[string]*pcm.Process
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validators []Validator
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nonce uint64
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}{sync.Mutex{}, make(map[string]*pcm.Process), nil, 0}
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func main() {
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// read options from stdin.
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var err error
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optionsBytes, err := ioutil.ReadAll(os.Stdin)
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if err != nil {
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panic(Fmt("Error reading input: %v", err))
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}
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options := binary.ReadJSON(&Options{}, optionsBytes, &err).(*Options)
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if err != nil {
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panic(Fmt("Error parsing input: %v", err))
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}
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barak.nonce = options.StartNonce
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barak.validators = options.Validators
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// Debug.
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fmt.Printf("Options: %v\n", options)
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fmt.Printf("Barak: %v\n", barak)
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// Start rpc server.
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mux := http.NewServeMux()
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mux.HandleFunc("/download", ServeFile)
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// TODO: mux.HandleFunc("/upload", UploadFile)
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rpc.RegisterRPCFuncs(mux, Routes)
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rpc.StartHTTPServer(options.ListenAddress, mux)
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TrapSignal(func() {
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fmt.Println("Barak shutting down")
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})
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}
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//------------------------------------------------------------------------------
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// RPC main function
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func Run(authCommand AuthCommand) (interface{}, error) {
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command, err := parseValidateCommand(authCommand)
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if err != nil {
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return nil, err
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}
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log.Info(Fmt("Run() received command %v", reflect.TypeOf(command)))
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// Issue command
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switch c := command.(type) {
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case CommandRunProcess:
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return RunProcess(c.Wait, c.Label, c.ExecPath, c.Args, c.Input)
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case CommandStopProcess:
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return StopProcess(c.Label, c.Kill)
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case CommandListProcesses:
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return ListProcesses()
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default:
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return nil, errors.New("Invalid endpoint for command")
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}
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}
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func parseValidateCommandStr(authCommandStr string) (Command, error) {
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var err error
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authCommand := binary.ReadJSON(AuthCommand{}, []byte(authCommandStr), &err).(AuthCommand)
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if err != nil {
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fmt.Printf("Failed to parse auth_command")
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return nil, errors.New("AuthCommand parse error")
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}
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return parseValidateCommand(authCommand)
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}
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func parseValidateCommand(authCommand AuthCommand) (Command, error) {
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commandJSONStr := authCommand.CommandJSONStr
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signatures := authCommand.Signatures
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// Validate commandJSONStr
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if !validate([]byte(commandJSONStr), barak.validators, signatures) {
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fmt.Printf("Failed validation attempt")
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return nil, errors.New("Validation error")
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}
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// Parse command
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var err error
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command := binary.ReadJSON(NoncedCommand{}, []byte(commandJSONStr), &err).(NoncedCommand)
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if err != nil {
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fmt.Printf("Failed to parse command")
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return nil, errors.New("Command parse error")
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}
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// Prevent replays
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if barak.nonce+1 != command.Nonce {
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return nil, errors.New("Replay error")
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} else {
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barak.nonce += 1
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}
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return command.Command, nil
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}
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//------------------------------------------------------------------------------
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// RPC base commands
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// WARNING Not validated, do not export to routes.
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func RunProcess(wait bool, label string, execPath string, args []string, input string) (*ResponseRunProcess, error) {
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barak.mtx.Lock()
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// First, see if there already is a process labeled 'label'
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existing := barak.processes[label]
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if existing != nil {
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barak.mtx.Unlock()
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return nil, Errorf("Process already exists: %v", label)
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}
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// Otherwise, create one.
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proc := pcm.Create(pcm.ProcessModeDaemon, label, execPath, args, input)
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barak.processes[label] = proc
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barak.mtx.Unlock()
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if wait {
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exitErr := pcm.Wait(proc)
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return nil, exitErr
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} else {
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return &ResponseRunProcess{}, nil
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}
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}
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func StopProcess(label string, kill bool) (*ResponseStopProcess, error) {
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barak.mtx.Lock()
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proc := barak.processes[label]
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barak.mtx.Unlock()
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if proc == nil {
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return nil, Errorf("Process does not exist: %v", label)
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}
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err := pcm.Stop(proc, kill)
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return &ResponseStopProcess{}, err
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}
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func ListProcesses() (*ResponseListProcesses, error) {
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var procs = []*pcm.Process{}
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barak.mtx.Lock()
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for _, proc := range barak.processes {
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procs = append(procs, proc)
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}
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barak.mtx.Unlock()
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return &ResponseListProcesses{
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Processes: procs,
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}, nil
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}
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func ServeFile(w http.ResponseWriter, req *http.Request) {
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authCommandStr := req.FormValue("auth_command")
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command, err := parseValidateCommandStr(authCommandStr)
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if err != nil {
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http.Error(w, Fmt("Invalid command: %v", err), 400)
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}
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serveCommand, ok := command.(CommandServeFile)
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if !ok {
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http.Error(w, "Invalid command", 400)
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}
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path := serveCommand.Path
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if path == "" {
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http.Error(w, "Must specify path", 400)
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return
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}
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file, err := os.Open(path)
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if err != nil {
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http.Error(w, Fmt("Error opening file: %v. %v", path, err), 400)
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return
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}
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_, err = io.Copy(w, file)
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if err != nil {
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fmt.Fprintf(os.Stderr, Fmt("Error serving file: %v. %v", path, err))
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return
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}
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}
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