Merge PR #2274: simulation: Stop on SIGTERM

PENDING.md

@@ -114,5 +114,6 @@ BUG FIXES
     * [ledger] [\#2064](https://github.com/cosmos/cosmos-sdk/issues/2064) Fix inability to sign and send transactions via the LCD by
     loading a Ledger device at runtime.
     * [\#2158](https://github.com/cosmos/cosmos-sdk/issues/2158) Fix non-deterministic ordering of validator iteration when slashing in `gov EndBlocker`
+    * [simulation] \#1924 Make simulation stop on SIGTERM
 
 * Tendermint

x/mock/simulation/random_simulate_blocks.go

@@ -6,7 +6,9 @@ import (
 	"math"
 	"math/rand"
 	"os"
+	"os/signal"
 	"sort"
+	"syscall"
 	"testing"
 	"time"
 
@@ -76,6 +78,16 @@ func SimulateFromSeed(
 	header := abci.Header{Height: 0, Time: timestamp}
 	opCount := 0
 
+	// Setup code to catch SIGTERM's
+	c := make(chan os.Signal)
+	signal.Notify(c, os.Interrupt, syscall.SIGTERM)
+	go func() {
+		<-c
+		fmt.Printf("Exiting early due to SIGTERM, on block %d, operation %d\n", header.Height, opCount)
+		DisplayEvents(events)
+		os.Exit(128 + int(syscall.SIGTERM))
+	}()
+
 	var pastTimes []time.Time
 	var pastSigningValidators [][]abci.SigningValidator