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117 lines
3.8 KiB
117 lines
3.8 KiB
package main
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import (
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"fmt"
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"io"
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"net/url"
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"os"
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acm "github.com/tendermint/tendermint/account"
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"github.com/tendermint/tendermint/binary"
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btypes "github.com/tendermint/tendermint/cmd/barak/types"
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. "github.com/tendermint/tendermint/common"
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"github.com/tendermint/tendermint/rpc/client"
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"net/http"
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)
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// These are convenience functions for a single developer.
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// When multiple are involved, the workflow is different.
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// (First the command(s) are signed by all validators,
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// and then it is broadcast).
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func StartProcess(privKey acm.PrivKey, remote string, command btypes.CommandStartProcess) (response btypes.ResponseStartProcess, err error) {
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nonce, err := GetNonce(remote)
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if err != nil {
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return response, err
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}
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commandBytes, signature := SignCommand(privKey, nonce+1, command)
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_, err = RunAuthCommand(remote, commandBytes, []acm.Signature{signature}, &response)
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return response, err
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}
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func StopProcess(privKey acm.PrivKey, remote string, command btypes.CommandStopProcess) (response btypes.ResponseStopProcess, err error) {
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nonce, err := GetNonce(remote)
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if err != nil {
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return response, err
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}
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commandBytes, signature := SignCommand(privKey, nonce+1, command)
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_, err = RunAuthCommand(remote, commandBytes, []acm.Signature{signature}, &response)
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return response, err
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}
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func ListProcesses(privKey acm.PrivKey, remote string, command btypes.CommandListProcesses) (response btypes.ResponseListProcesses, err error) {
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nonce, err := GetNonce(remote)
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if err != nil {
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return response, err
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}
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commandBytes, signature := SignCommand(privKey, nonce+1, command)
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_, err = RunAuthCommand(remote, commandBytes, []acm.Signature{signature}, &response)
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return response, err
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}
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func DownloadFile(privKey acm.PrivKey, remote string, command btypes.CommandServeFile, outPath string) (n int64, err error) {
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// Create authCommandJSONBytes
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nonce, err := GetNonce(remote)
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if err != nil {
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return 0, err
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}
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commandBytes, signature := SignCommand(privKey, nonce+1, command)
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authCommand := btypes.AuthCommand{
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CommandJSONStr: string(commandBytes),
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Signatures: []acm.Signature{signature},
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}
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authCommandJSONBytes := binary.JSONBytes(authCommand)
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// Make request and write to outPath.
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httpResponse, err := http.PostForm(remote+"/download", url.Values{"auth_command": {string(authCommandJSONBytes)}})
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if err != nil {
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return 0, err
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}
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defer httpResponse.Body.Close()
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outFile, err := os.OpenFile(outPath, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0600)
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if err != nil {
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return 0, err
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}
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defer outFile.Close()
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n, err = io.Copy(outFile, httpResponse.Body)
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if err != nil {
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return 0, err
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}
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return n, nil
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}
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//-----------------------------------------------------------------------------
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// Utility method to get nonce from the remote.
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// The next command should include the returned nonce+1 as nonce.
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func GetNonce(remote string) (uint64, error) {
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response, err := GetStatus(remote)
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return response.Nonce, err
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}
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func GetStatus(remote string) (response btypes.ResponseStatus, err error) {
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_, err = rpcclient.Call(remote, "status", Arr(), &response)
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if err != nil {
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return response, fmt.Errorf("Error fetching nonce from remote %v:\n %v", remote, err)
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}
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return response, nil
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}
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// Each developer runs this
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func SignCommand(privKey acm.PrivKey, nonce uint64, command btypes.Command) ([]byte, acm.Signature) {
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noncedCommand := btypes.NoncedCommand{
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Nonce: nonce,
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Command: command,
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}
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commandJSONBytes := binary.JSONBytes(noncedCommand)
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signature := privKey.Sign(commandJSONBytes)
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return commandJSONBytes, signature
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}
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// Somebody aggregates the signatures and calls this.
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func RunAuthCommand(remote string, commandJSONBytes []byte, signatures []acm.Signature, dest interface{}) (interface{}, error) {
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authCommand := btypes.AuthCommand{
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CommandJSONStr: string(commandJSONBytes),
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Signatures: signatures,
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}
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return rpcclient.Call(remote, "run", Arr(authCommand), dest)
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}
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