155 lines
3.5 KiB
Go
155 lines
3.5 KiB
Go
package main
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import (
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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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"sync"
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acm "github.com/tendermint/tendermint/account"
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"github.com/tendermint/tendermint/binary"
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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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"RunProcess": rpc.NewRPCFunc(RunProcess, []string{"wait", "label", "execPath", "args"}),
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"ListProcesses": rpc.NewRPCFunc(ListProcesses, []string{}),
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"StopProcess": rpc.NewRPCFunc(StopProcess, []string{"label", "kill"}),
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// NOTE: also, two special non-JSONRPC routes called
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// "download" and "upload".
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}
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type Validator struct {
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VotingPower uint64
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PubKey acm.PubKey
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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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}
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// Global instance
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var debora = struct {
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mtx sync.Mutex
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processes map[string]*pcm.Process
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}{sync.Mutex{}, make(map[string]*pcm.Process)}
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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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// Debug.
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fmt.Printf("Validators: %v\n", options.Validators)
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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("Debora shutting down")
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})
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}
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//------------------------------------------------------------------------------
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// RPC functions
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type ResponseRunProcess struct {
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}
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func RunProcess(wait bool, label string, execPath string, args []string, input string) (*ResponseRunProcess, error) {
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debora.mtx.Lock()
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// First, see if there already is a process labeled 'label'
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existing := debora.processes[label]
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if existing != nil {
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debora.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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debora.processes[label] = proc
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debora.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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//--------------------------------------
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type ResponseListProcesses struct {
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Processes []*pcm.Process
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}
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func ListProcesses() (*ResponseListProcesses, error) {
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var procs = []*pcm.Process{}
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debora.mtx.Lock()
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for _, proc := range debora.processes {
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procs = append(procs, proc)
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}
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debora.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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//--------------------------------------
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type ResponseStopProcess struct {
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}
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func StopProcess(label string, kill bool) (*ResponseStopProcess, error) {
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debora.mtx.Lock()
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proc := debora.processes[label]
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debora.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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//------------------------------------------------------------------------------
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func ServeFile(w http.ResponseWriter, req *http.Request) {
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path := req.FormValue("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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