[c] Add stopbefore flag

dfssc/cmd/root.go

@@ -39,7 +39,8 @@ func init() {
 	RootCmd.PersistentFlags().String("host", "localhost:9000", "host of the dfss platform")
 	RootCmd.PersistentFlags().IntP("port", "p", 9005, "port to use for P2P communication between clients")
 
-	signCmd.Flags().Duration("slowdown", 0, "Delay between each promises round")
+	signCmd.Flags().Duration("slowdown", 0, "delay between each promises round (test only)")
+	signCmd.Flags().Int("stopbefore", 0, "stop signature just before the promises round n, -1 to stop right before signature round (test only)")
 
 	// Store flag values into viper
 	_ = viper.BindPFlag("verbose", RootCmd.PersistentFlags().Lookup("verbose"))

dfssc/cmd/sign.go

@@ -19,6 +19,7 @@ var signCmd = &cobra.Command{
 		}
 
 		_ = viper.BindPFlag("slowdown", cmd.Flags().Lookup("slowdown"))
+		_ = viper.BindPFlag("stopbefore", cmd.Flags().Lookup("stopbefore"))
 
 		filename := args[0]
 		fmt.Println("You are going to sign the following contract:")

dfssc/sign/protocol.go

@@ -3,6 +3,7 @@ package sign
 
 import (
 	"fmt"
+	"os"
 	"time"
 
 	cAPI "dfss/dfssc/api"
@@ -42,6 +43,7 @@ func (m *SignatureManager) Sign() error {
 	// Promess rounds
 	// Follow the sequence until there is no next occurence of me
 	for m.currentIndex >= 0 {
+		stopIfNeeded(m.currentIndex)
 		m.OnProgressUpdate(m.currentIndex, seqLen+1)
 		time.Sleep(viper.GetDuration("slowdown"))
 		dAPI.DLog("starting round at index [" + fmt.Sprintf("%d", m.currentIndex) + "] with nextIndex=" + fmt.Sprintf("%d", nextIndex))
@@ -70,16 +72,17 @@ func (m *SignatureManager) Sign() error {
 		}
 	}
 
+	// Signature round
+	stopIfNeeded(-1)
 	m.OnProgressUpdate(seqLen, seqLen+1)
 	dAPI.DLog("entering signature round")
-	// Signature round
 	err = m.ExchangeAllSignatures()
 	if err != nil {
 		return err
 	}
+
 	dAPI.DLog("exiting signature round")
 	m.OnProgressUpdate(seqLen+1, seqLen+1)
-
 	return nil
 }
 
@@ -151,3 +154,14 @@ func (m *SignatureManager) closeConnections() {
 	}
 	m.cServer.Stop()
 }
+
+func stopIfNeeded(index int) {
+	s := viper.GetInt("stopbefore")
+	if s == 0 {
+		return
+	}
+
+	if index == -1 && s == -1 || index+1 == s {
+		os.Exit(0)
+	}
+}