op-challenger: Introduce cannon trace provider

Currently only loads existing proofs and can't run cannon to generate them.

op-challenger/fault/cannon/cannon_provider.go

+package cannon
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/ethereum-optimism/optimism/op-challenger/fault"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+)
+
+const proofsDir = "proofs"
+
+type proofData struct {
+	ClaimValue hexutil.Bytes `json:"post"`
+	StateData  hexutil.Bytes `json:"state-data"`
+	ProofData  hexutil.Bytes `json:"proof-data"`
+}
+
+type CannonTraceProvider struct {
+	dir string
+}
+
+func NewCannonTraceProvider(dataDir string) *CannonTraceProvider {
+	return &CannonTraceProvider{
+		dir: dataDir,
+	}
+}
+
+func (p *CannonTraceProvider) Get(i uint64) (common.Hash, error) {
+	proof, err := p.loadProof(i)
+	if err != nil {
+		return common.Hash{}, err
+	}
+	value := common.BytesToHash(proof.ClaimValue)
+
+	if value == (common.Hash{}) {
+		return common.Hash{}, errors.New("proof missing post hash")
+	}
+	return value, nil
+}
+
+func (p *CannonTraceProvider) GetPreimage(i uint64) ([]byte, error) {
+	proof, err := p.loadProof(i)
+	if err != nil {
+		return nil, err
+	}
+	value := ([]byte)(proof.StateData)
+	if len(value) == 0 {
+		return nil, errors.New("proof missing state data")
+	}
+	return value, nil
+}
+
+func (p *CannonTraceProvider) AbsolutePreState() []byte {
+	panic("absolute prestate not yet supported")
+}
+
+func (p *CannonTraceProvider) loadProof(i uint64) (*proofData, error) {
+	path := filepath.Join(p.dir, proofsDir, fmt.Sprintf("%d.json", i))
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, fmt.Errorf("cannot open proof file (%v): %w", path, err)
+	}
+	defer file.Close()
+	var proof proofData
+	err = json.NewDecoder(file).Decode(&proof)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read proof (%v): %w", path, err)
+	}
+	return &proof, nil
+}
+
+var _ fault.TraceProvider = (*CannonTraceProvider)(nil)

op-challenger/fault/cannon/cannon_provider_test.go

+package cannon
+
+import (
+	"embed"
+	_ "embed"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/stretchr/testify/require"
+)
+
+//go:embed test_data
+var testData embed.FS
+
+func TestGet(t *testing.T) {
+	provider := setupWithTestData(t)
+	t.Run("ExistingProof", func(t *testing.T) {
+		value, err := provider.Get(0)
+		require.NoError(t, err)
+		require.Equal(t, common.HexToHash("0x45fd9aa59768331c726e719e76aa343e73123af888804604785ae19506e65e87"), value)
+	})
+
+	t.Run("ProofUnavailable", func(t *testing.T) {
+		_, err := provider.Get(7)
+		require.ErrorIs(t, err, os.ErrNotExist)
+	})
+
+	t.Run("MissingPostHash", func(t *testing.T) {
+		_, err := provider.Get(1)
+		require.ErrorContains(t, err, "missing post hash")
+	})
+
+	t.Run("IgnoreUnknownFields", func(t *testing.T) {
+		value, err := provider.Get(2)
+		require.NoError(t, err)
+		expected := common.HexToHash("bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb")
+		require.Equal(t, expected, value)
+	})
+}
+
+func TestGetPreimage(t *testing.T) {
+	provider := setupWithTestData(t)
+	t.Run("ExistingProof", func(t *testing.T) {
+		value, err := provider.GetPreimage(0)
+		require.NoError(t, err)
+		expected := common.Hex2Bytes("b8f068de604c85ea0e2acd437cdb47add074a2d70b81d018390c504b71fe26f400000000000000000000000000000000000000000000000000000000000000000000000000")
+		require.Equal(t, expected, value)
+	})
+
+	t.Run("ProofUnavailable", func(t *testing.T) {
+		_, err := provider.GetPreimage(7)
+		require.ErrorIs(t, err, os.ErrNotExist)
+	})
+
+	t.Run("MissingStateData", func(t *testing.T) {
+		_, err := provider.GetPreimage(1)
+		require.ErrorContains(t, err, "missing state data")
+	})
+
+	t.Run("IgnoreUnknownFields", func(t *testing.T) {
+		value, err := provider.GetPreimage(2)
+		require.NoError(t, err)
+		expected := common.Hex2Bytes("cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc")
+		require.Equal(t, expected, value)
+	})
+}
+
+func setupWithTestData(t *testing.T) *CannonTraceProvider {
+	srcDir := filepath.Join("test_data", "proofs")
+	entries, err := testData.ReadDir(srcDir)
+	require.NoError(t, err)
+	dataDir := t.TempDir()
+	require.NoError(t, os.Mkdir(filepath.Join(dataDir, proofsDir), 0o777))
+	for _, entry := range entries {
+		path := filepath.Join(srcDir, entry.Name())
+		file, err := testData.ReadFile(path)
+		require.NoErrorf(t, err, "reading %v", path)
+		err = os.WriteFile(filepath.Join(dataDir, "proofs", entry.Name()), file, 0o644)
+		require.NoErrorf(t, err, "writing %v", path)
+	}
+	return NewCannonTraceProvider(dataDir)
+}

op-challenger/fault/cannon/test_data/proofs/0.json

+{"step":0,"pre":"0x71f9eb93ff904e5c03c3425228ef75766db0c906ad239df9a7a7f0d9c6a89705","post":"0x45fd9aa59768331c726e719e76aa343e73123af888804604785ae19506e65e87","state-data":"0xb8f068de604c85ea0e2acd437cdb47add074a2d70b81d018390c504b71fe26f400000000000000000000000000000000000000000000000000000000000000000000000000","proof-data":"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","step-input":"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op-challenger/fault/cannon/test_data/proofs/1.json

+{}

op-challenger/fault/cannon/test_data/proofs/2.json

+{"foo":0,"bar":"0x71f9eb93ff904e5c03c3425228ef75766db0c906ad239df9a7a7f0d9c6a89705","post":"0xbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb","state-data":"0xcccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc","proof-data":"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","step-input":"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