op-challenger: Fix recording of cannon execution time.

Previously only recorded failed cannon executions.

op-challenger/game/fault/trace/cannon/executor.go

@@ -124,10 +124,7 @@ func (e *Executor) GenerateProof(ctx context.Context, dir string, i uint64) erro
 	e.logger.Info("Generating trace", "proof", i, "cmd", e.cannon, "args", strings.Join(args, ", "))
 	execStart := time.Now()
 	err = e.cmdExecutor(ctx, e.logger.New("proof", i), e.cannon, args...)
-	if err != nil {
-		execDuration := time.Since(execStart).Seconds()
-		e.metrics.RecordCannonExecutionTime(execDuration)
-	}
+	e.metrics.RecordCannonExecutionTime(time.Since(execStart).Seconds())
 	return err
 }
 

op-challenger/game/fault/trace/cannon/executor_test.go

@@ -40,7 +40,8 @@ func TestGenerateProof(t *testing.T) {
 		L2BlockNumber: big.NewInt(3333),
 	}
 	captureExec := func(t *testing.T, cfg config.Config, proofAt uint64) (string, string, map[string]string) {
-		executor := NewExecutor(testlog.Logger(t, log.LvlInfo), metrics.NoopMetrics, &cfg, inputs)
+		m := &cannonDurationMetrics{}
+		executor := NewExecutor(testlog.Logger(t, log.LvlInfo), m, &cfg, inputs)
 		executor.selectSnapshot = func(logger log.Logger, dir string, absolutePreState string, i uint64) (string, error) {
 			return input, nil
 		}
@@ -63,6 +64,7 @@ func TestGenerateProof(t *testing.T) {
 		}
 		err := executor.GenerateProof(context.Background(), dir, proofAt)
 		require.NoError(t, err)
+		require.Equal(t, 1, m.executionTimeRecordCount, "Should record cannon execution time")
 		return binary, subcommand, args
 	}
 
@@ -211,3 +213,12 @@ func TestFindStartingSnapshot(t *testing.T) {
 		require.Equal(t, filepath.Join(dir, "100.json.gz"), snapshot)
 	})
 }
+
+type cannonDurationMetrics struct {
+	metrics.NoopMetricsImpl
+	executionTimeRecordCount int
+}
+
+func (c *cannonDurationMetrics) RecordCannonExecutionTime(_ float64) {
+	c.executionTimeRecordCount++
+}

op-challenger/metrics/noop.go

@@ -4,21 +4,21 @@ import (
 	txmetrics "github.com/ethereum-optimism/optimism/op-service/txmgr/metrics"
 )
 
-type noopMetrics struct {
+type NoopMetricsImpl struct {
 	txmetrics.NoopTxMetrics
 }
 
-var NoopMetrics Metricer = new(noopMetrics)
+var NoopMetrics Metricer = new(NoopMetricsImpl)
 
-func (*noopMetrics) RecordInfo(version string) {}
-func (*noopMetrics) RecordUp()                 {}
+func (*NoopMetricsImpl) RecordInfo(version string) {}
+func (*NoopMetricsImpl) RecordUp()                 {}
 
-func (*noopMetrics) RecordGameMove() {}
-func (*noopMetrics) RecordGameStep() {}
+func (*NoopMetricsImpl) RecordGameMove() {}
+func (*NoopMetricsImpl) RecordGameStep() {}
 
-func (*noopMetrics) RecordCannonExecutionTime(t float64) {}
+func (*NoopMetricsImpl) RecordCannonExecutionTime(t float64) {}
 
-func (*noopMetrics) RecordGamesStatus(inProgress, defenderWon, challengerWon int) {}
+func (*NoopMetricsImpl) RecordGamesStatus(inProgress, defenderWon, challengerWon int) {}
 
-func (*noopMetrics) RecordGameUpdateScheduled() {}
-func (*noopMetrics) RecordGameUpdateCompleted() {}
+func (*NoopMetricsImpl) RecordGameUpdateScheduled() {}
+func (*NoopMetricsImpl) RecordGameUpdateCompleted() {}