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package derive
import (
"context"
"errors"
"io"
"math/rand"
"testing"
"github.com/stretchr/testify/require"
"github.com/ethereum-optimism/optimism/op-node/eth"
"github.com/ethereum-optimism/optimism/op-node/testlog"
"github.com/ethereum-optimism/optimism/op-node/testutils"
"github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/log"
)
// TestL1TraversalNext tests that the `Next` function only returns
// a block reference once and then properly returns io.EOF afterwards
func TestL1TraversalNext(t *testing.T) {
rng := rand.New(rand.NewSource(1234))
a := testutils.RandomBlockRef(rng)
tr := NewL1Traversal(testlog.Logger(t, log.LvlError), nil)
// Load up the initial state with a reset
_ = tr.Reset(context.Background(), a)
// First call should always succeed
ref, err := tr.NextL1Block(context.Background())
require.Nil(t, err)
require.Equal(t, a, ref)
// Subsequent calls should return io.EOF
ref, err = tr.NextL1Block(context.Background())
require.Equal(t, eth.L1BlockRef{}, ref)
require.Equal(t, io.EOF, err)
ref, err = tr.NextL1Block(context.Background())
require.Equal(t, eth.L1BlockRef{}, ref)
require.Equal(t, io.EOF, err)
}
// TestL1TraversalAdvance tests that the `Advance` function properly
// handles different error cases and returns the expected block ref
// if there is no error.
func TestL1TraversalAdvance(t *testing.T) {
rng := rand.New(rand.NewSource(1234))
a := testutils.RandomBlockRef(rng)
b := testutils.NextRandomRef(rng, a)
// x is at the same height as b but does not extend `a`
x := testutils.RandomBlockRef(rng)
x.Number = b.Number
tests := []struct {
name string
startBlock eth.L1BlockRef
nextBlock eth.L1BlockRef
fetcherErr error
expectedErr error
}{
{
name: "simple extension",
startBlock: a,
nextBlock: b,
fetcherErr: nil,
expectedErr: nil,
},
{
name: "reorg",
startBlock: a,
nextBlock: x,
fetcherErr: nil,
expectedErr: ErrReset,
},
{
name: "not found",
startBlock: a,
nextBlock: eth.L1BlockRef{},
fetcherErr: ethereum.NotFound,
expectedErr: io.EOF,
},
{
name: "temporary error",
startBlock: a,
nextBlock: eth.L1BlockRef{},
fetcherErr: errors.New("interrupted connection"),
expectedErr: ErrTemporary,
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
src := &testutils.MockL1Source{}
src.ExpectL1BlockRefByNumber(test.startBlock.Number+1, test.nextBlock, test.fetcherErr)
tr := NewL1Traversal(testlog.Logger(t, log.LvlError), src)
// Load up the initial state with a reset
_ = tr.Reset(context.Background(), test.startBlock)
// Advance it + assert output
err := tr.AdvanceL1Block(context.Background())
require.ErrorIs(t, err, test.expectedErr)
if test.expectedErr == nil {
ref, err := tr.NextL1Block(context.Background())
require.Nil(t, err)
require.Equal(t, test.nextBlock, ref)
}
src.AssertExpectations(t)
})
}
}