Add ArbOS precompile method to get scheduled upgrade

precompiles/ArbOwnerPublic.go

@@ -52,3 +52,16 @@ func (con ArbOwnerPublic) GetInfraFeeAccount(c ctx, evm mech) (addr, error) {
 func (con ArbOwnerPublic) GetBrotliCompressionLevel(c ctx, evm mech) (uint64, error) {
 	return c.State.BrotliCompressionLevel()
 }
+
+// GetScheduledUpgrade gets the next scheduled ArbOS version upgrade and its activation timestamp.
+// Returns (0, 0, nil) if no ArbOS upgrade is scheduled.
+func (con ArbOwnerPublic) GetScheduledUpgrade(c ctx, evm mech) (uint64, uint64, error) {
+	version, timestamp, err := c.State.GetScheduledUpgrade()
+	if err != nil {
+		return 0, 0, err
+	}
+	if c.State.ArbOSVersion() >= version {
+		return 0, 0, nil
+	}
+	return version, timestamp, nil
+}

system_tests/precompile_test.go

@@ -120,3 +120,54 @@ func TestPrecompileErrorGasLeft(t *testing.T) {
 	Require(t, err)
 	assertNotAllGasConsumed(common.HexToAddress("0xff"), arbDebug.Methods["legacyError"].ID)
 }
+
+func TestScheduleArbosUpgrade(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	builder := NewNodeBuilder(ctx).DefaultConfig(t, false)
+	cleanup := builder.Build(t)
+	defer cleanup()
+
+	auth := builder.L2Info.GetDefaultTransactOpts("Owner", ctx)
+
+	arbOwnerPublic, err := precompilesgen.NewArbOwnerPublic(common.HexToAddress("0x6b"), builder.L2.Client)
+	Require(t, err, "could not bind ArbOwner contract")
+
+	arbOwner, err := precompilesgen.NewArbOwner(common.HexToAddress("0x70"), builder.L2.Client)
+	Require(t, err, "could not bind ArbOwner contract")
+
+	callOpts := &bind.CallOpts{Context: ctx}
+	scheduled, err := arbOwnerPublic.GetScheduledUpgrade(callOpts)
+	Require(t, err, "failed to call GetScheduledUpgrade before scheduling upgrade")
+	if scheduled.ArbosVersion != 0 || scheduled.ScheduledForTimestamp != 0 {
+		t.Errorf("expected no upgrade to be scheduled, got version %v timestamp %v", scheduled.ArbosVersion, scheduled.ScheduledForTimestamp)
+	}
+
+	// Schedule a noop upgrade, which should test GetScheduledUpgrade in the same way an already completed upgrade would.
+	tx, err := arbOwner.ScheduleArbOSUpgrade(&auth, 1, 1)
+	Require(t, err)
+	_, err = builder.L2.EnsureTxSucceeded(tx)
+	Require(t, err)
+
+	scheduled, err = arbOwnerPublic.GetScheduledUpgrade(callOpts)
+	Require(t, err, "failed to call GetScheduledUpgrade after scheduling noop upgrade")
+	if scheduled.ArbosVersion != 0 || scheduled.ScheduledForTimestamp != 0 {
+		t.Errorf("expected completed scheduled upgrade to be ignored, got version %v timestamp %v", scheduled.ArbosVersion, scheduled.ScheduledForTimestamp)
+	}
+
+	// TODO: Once we have an ArbOS 30, test a real upgrade with it
+	// We can't test 11 -> 20 because 11 doesn't have the GetScheduledUpgrade method we want to test
+	var testVersion uint64 = 100
+	var testTimestamp uint64 = 1 << 62
+	tx, err = arbOwner.ScheduleArbOSUpgrade(&auth, 100, 1<<62)
+	Require(t, err)
+	_, err = builder.L2.EnsureTxSucceeded(tx)
+	Require(t, err)
+
+	scheduled, err = arbOwnerPublic.GetScheduledUpgrade(callOpts)
+	Require(t, err, "failed to call GetScheduledUpgrade after scheduling upgrade")
+	if scheduled.ArbosVersion != testVersion || scheduled.ScheduledForTimestamp != testTimestamp {
+		t.Errorf("expected upgrade to be scheduled for version %v timestamp %v, got version %v timestamp %v", testVersion, testTimestamp, scheduled.ArbosVersion, scheduled.ScheduledForTimestamp)
+	}
+}