message: Add random bytes `GarbageKind`; Remove `MALFORM_RLP` & `INVALID_COMPRESSION` are WIP
diff: @@ -4,9 +4,9 @@ import (
  "bytes"
  "context"
  "crypto/ecdsa"
  - "encoding/hex"
  "io"
  "math/big"
  + "math/rand"
  "github.com/ethereum/go-ethereum/common"
  "github.com/ethereum/go-ethereum/core"
  @@ -14,7 +14,6 @@ import (
  "github.com/ethereum/go-ethereum/crypto"
  "github.com/ethereum/go-ethereum/log"
  "github.com/ethereum/go-ethereum/params"
  - "github.com/ethereum/go-ethereum/rlp"
  "github.com/stretchr/testify/require"
  "github.com/ethereum-optimism/optimism/op-node/eth"
  @@ -202,14 +201,18 @@ type GarbageKind int64
  const (
  STRIP_VERSION GarbageKind = iota
  + RANDOM
  MALFORM_RLP
  + INVALID_COMPRESSION
  TRUNCATE_END
  DIRTY_APPEND
  )
  var GarbageKinds = []GarbageKind{
  STRIP_VERSION,
  + RANDOM,
  // MALFORM_RLP,
  + // INVALID_COMPRESSION,
  TRUNCATE_END,
  DIRTY_APPEND,
  }
  @@ -226,6 +229,7 @@ func (s *L2Batcher) ActL2BatchSubmitGarbage(t Testing, kind GarbageKind) {
  // Collect the output frame
  data := new(bytes.Buffer)
  data.WriteByte(derive.DerivationVersion0)
  +
  // subtract one, to account for the version byte
  if err := s.l2ChannelOut.OutputFrame(data, s.l2BatcherCfg.MaxL1TxSize-1); err == io.EOF {
  s.l2ChannelOut = nil
  @@ -242,9 +246,12 @@ func (s *L2Batcher) ActL2BatchSubmitGarbage(t Testing, kind GarbageKind) {
  // Strip the derivation version byte from the output frame
  case STRIP_VERSION:
  outputFrame = outputFrame[1:]
  - case MALFORM_RLP:
  - // WIP
  - t.Log("output frame", hex.EncodeToString(outputFrame), rlp.Decode(bytes.NewReader(outputFrame[1:len(outputFrame)-47]), &derive.BatchData{}))
  + // Replace the output frame with random bytes of length [1, 512]
  + case RANDOM:
  + buf := make([]byte, rand.Intn(512)+1)
  + _, err := rand.Read(buf)
  + require.NoError(t, err, "error generating random bytes")
  + outputFrame = buf
  // Remove 4 bytes from the tail end of the output frame
  case TRUNCATE_END:
  outputFrame = outputFrame[:len(outputFrame)-4]
  