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package altda
import (
"context"
"errors"
"io"
"net/http"
"sync"
"time"
"github.com/ethereum-optimism/optimism/op-service/eth"
"github.com/ethereum-optimism/optimism/op-service/log"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/ethdb/memorydb"
)
// MockDAClient mocks a DA storage provider to avoid running an HTTP DA server
// in unit tests.
type MockDAClient struct {
CommitmentType CommitmentType
store ethdb.KeyValueStore
log log.Logger
}
func NewMockDAClient(log log.Logger) *MockDAClient {
return &MockDAClient{
CommitmentType: Keccak256CommitmentType,
store: memorydb.New(),
log: log,
}
}
func (c *MockDAClient) GetInput(ctx context.Context, key CommitmentData) ([]byte, error) {
bytes, err := c.store.Get(key.Encode())
if err != nil {
return nil, ErrNotFound
}
return bytes, nil
}
func (c *MockDAClient) SetInput(ctx context.Context, data []byte) (CommitmentData, error) {
key := NewCommitmentData(c.CommitmentType, data)
return key, c.store.Put(key.Encode(), data)
}
func (c *MockDAClient) DeleteData(key []byte) error {
return c.store.Delete(key)
}
type DAErrFaker struct {
Client *MockDAClient
getInputErr error
setInputErr error
}
func (f *DAErrFaker) GetInput(ctx context.Context, key CommitmentData) ([]byte, error) {
if err := f.getInputErr; err != nil {
f.getInputErr = nil
return nil, err
}
return f.Client.GetInput(ctx, key)
}
func (f *DAErrFaker) SetInput(ctx context.Context, data []byte) (CommitmentData, error) {
if err := f.setInputErr; err != nil {
f.setInputErr = nil
return nil, err
}
return f.Client.SetInput(ctx, data)
}
func (f *DAErrFaker) ActGetPreImageFail() {
f.getInputErr = errors.New("get input failed")
}
func (f *DAErrFaker) ActSetPreImageFail() {
f.setInputErr = errors.New("set input failed")
}
var Disabled = &AltDADisabled{}
var ErrNotEnabled = errors.New("altDA not enabled")
// AltDADisabled is a noop AltDA implementation for stubbing.
type AltDADisabled struct{}
func (d *AltDADisabled) GetInput(ctx context.Context, l1 L1Fetcher, commitment CommitmentData, blockId eth.L1BlockRef) (eth.Data, error) {
return nil, ErrNotEnabled
}
func (d *AltDADisabled) Reset(ctx context.Context, base eth.L1BlockRef, baseCfg eth.SystemConfig) error {
return io.EOF
}
func (d *AltDADisabled) Finalize(ref eth.L1BlockRef) {
}
func (d *AltDADisabled) OnFinalizedHeadSignal(f HeadSignalFn) {
}
func (d *AltDADisabled) AdvanceL1Origin(ctx context.Context, l1 L1Fetcher, blockId eth.BlockID) error {
return ErrNotEnabled
}
// FakeDAServer is a fake DA server for e2e tests.
// It is a small wrapper around DAServer that allows for setting request latencies,
// to mimic a DA service with slow responses (eg. eigenDA with 10 min batching interval).
type FakeDAServer struct {
*DAServer
putRequestLatency time.Duration
getRequestLatency time.Duration
}
func NewFakeDAServer(host string, port int, log log.Logger) *FakeDAServer {
store := NewMemStore()
fakeDAServer := &FakeDAServer{
DAServer: NewDAServer(host, port, store, log, true),
putRequestLatency: 0,
getRequestLatency: 0,
}
return fakeDAServer
}
func (s *FakeDAServer) HandleGet(w http.ResponseWriter, r *http.Request) {
time.Sleep(s.getRequestLatency)
s.DAServer.HandleGet(w, r)
}
func (s *FakeDAServer) HandlePut(w http.ResponseWriter, r *http.Request) {
time.Sleep(s.putRequestLatency)
s.DAServer.HandlePut(w, r)
}
func (s *FakeDAServer) Start() error {
err := s.DAServer.Start()
if err != nil {
return err
}
// Override the HandleGet/Put method registrations
mux := http.NewServeMux()
mux.HandleFunc("/get/", s.HandleGet)
mux.HandleFunc("/put", s.HandlePut)
s.httpServer.Handler = mux
return nil
}
func (s *FakeDAServer) SetPutRequestLatency(latency time.Duration) {
s.putRequestLatency = latency
}
func (s *FakeDAServer) SetGetRequestLatency(latency time.Duration) {
s.getRequestLatency = latency
}
type MemStore struct {
db map[string][]byte
lock sync.RWMutex
}
func NewMemStore() *MemStore {
return &MemStore{
db: make(map[string][]byte),
}
}
// Get retrieves the given key if it's present in the key-value store.
func (s *MemStore) Get(ctx context.Context, key []byte) ([]byte, error) {
s.lock.RLock()
defer s.lock.RUnlock()
if entry, ok := s.db[string(key)]; ok {
return common.CopyBytes(entry), nil
}
return nil, ErrNotFound
}
// Put inserts the given value into the key-value store.
func (s *MemStore) Put(ctx context.Context, key []byte, value []byte) error {
s.lock.Lock()
defer s.lock.Unlock()
s.db[string(key)] = common.CopyBytes(value)
return nil
}