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rebase. (give me a proper commit message)
Co-authored-by: Martin HS <martin@swende.se> Co-authored-by: Péter Szilágyi <peterke@gmail.com>
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May 13, 2024
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,132 @@ | ||
| package utils | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
| "github.com/ethereum/go-ethereum/common" | ||
| "github.com/ethereum/go-ethereum/consensus/beacon" | ||
| "github.com/ethereum/go-ethereum/consensus/ethash" | ||
| "github.com/ethereum/go-ethereum/core" | ||
| "github.com/ethereum/go-ethereum/core/rawdb" | ||
| "github.com/ethereum/go-ethereum/core/state" | ||
| "github.com/ethereum/go-ethereum/core/vm" | ||
| "github.com/ethereum/go-ethereum/crypto" | ||
| "github.com/ethereum/go-ethereum/log" | ||
| "github.com/ethereum/go-ethereum/params" | ||
| "github.com/ethereum/go-ethereum/triedb" | ||
| "io" | ||
| "net" | ||
| "net/http" | ||
| ) | ||
|
|
||
| func StatelessExecute(logOutput io.Writer, chainCfg *params.ChainConfig, witness *state.Witness) (root common.Hash, err error) { | ||
| rawDb := rawdb.NewMemoryDatabase() | ||
| if err := witness.PopulateDB(rawDb); err != nil { | ||
| return common.Hash{}, err | ||
| } | ||
| blob := rawdb.ReadAccountTrieNode(rawDb, nil) | ||
| prestateRoot := crypto.Keccak256Hash(blob) | ||
|
|
||
| db, err := state.New(prestateRoot, state.NewDatabaseWithConfig(rawDb, triedb.PathDefaults), nil) | ||
| if err != nil { | ||
| return common.Hash{}, err | ||
| } | ||
| engine := beacon.New(ethash.NewFaker()) | ||
| validator := core.NewStatelessBlockValidator(chainCfg, engine) | ||
| chainCtx := core.NewStatelessChainContext(rawDb, engine) | ||
| processor := core.NewStatelessStateProcessor(chainCfg, chainCtx, engine) | ||
|
|
||
| receipts, _, usedGas, err := processor.ProcessStateless(witness, witness.Block, db, vm.Config{}) | ||
| if err != nil { | ||
| return common.Hash{}, err | ||
| } | ||
| // compute the state root. skip validation of computed root against | ||
| // the one provided in the block because this value is omitted from | ||
| // the witness. | ||
| if root, err = validator.ValidateState(witness.Block, db, receipts, usedGas, false); err != nil { | ||
| return common.Hash{}, err | ||
| } | ||
| // TODO: how to differentiate between errors that are definitely not consensus-failure caused, and ones | ||
| // that could be? | ||
| return root, nil | ||
| } | ||
|
|
||
| // RunLocalServer runs an http server on the local address at the specified | ||
| // port (or 0 to use a random port). | ||
| // The server provides a POST endpoint /verify_block which takes input as an octet-stream RLP-encoded | ||
| // block witness proof in the body, executes the block proof and returns the computed state root. | ||
| func RunLocalServer(chainConfig *params.ChainConfig, port int) (closeChan chan<- struct{}, actualPort int, err error) { | ||
| mux := http.NewServeMux() | ||
| mux.Handle("/verify_block", &verifyHandler{chainConfig}) | ||
| srv := http.Server{Handler: mux} | ||
| listener, err := net.Listen("tcp", ":"+fmt.Sprintf("%d", port)) | ||
| if err != nil { | ||
| return nil, 0, err | ||
| } | ||
| actualPort = listener.Addr().(*net.TCPAddr).Port | ||
|
|
||
| go func() { | ||
| if err := srv.Serve(listener); err != nil && !errors.Is(err, http.ErrServerClosed) { | ||
| panic(err) | ||
| } | ||
| }() | ||
|
|
||
| closeCh := make(chan struct{}) | ||
| go func() { | ||
| select { | ||
| case <-closeCh: | ||
| if err := srv.Close(); err != nil { | ||
| panic(err) | ||
| } | ||
| } | ||
| }() | ||
| return closeCh, actualPort, nil | ||
| } | ||
|
|
||
| type verifyHandler struct { | ||
| chainConfig *params.ChainConfig | ||
| } | ||
|
|
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| func (v *verifyHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { | ||
| respError := func(descr string, err error) { | ||
| w.WriteHeader(http.StatusBadRequest) | ||
| if _, err := w.Write([]byte(fmt.Sprintf("%s: %s", descr, err))); err != nil { | ||
| log.Error("write failed", "error", err) | ||
| } | ||
|
|
||
| log.Error("responded with error", "descr", descr, "error", err) | ||
| } | ||
| defer r.Body.Close() | ||
| body, err := io.ReadAll(r.Body) | ||
| if err != nil { | ||
| respError("error reading body", err) | ||
| return | ||
| } | ||
| if len(body) == 0 { | ||
| respError("error", fmt.Errorf("empty body")) | ||
| return | ||
| } | ||
| witness, err := state.DecodeWitnessRLP(body) | ||
| if err != nil { | ||
| respError("error decoding body witness rlp", err) | ||
| return | ||
| } | ||
| defer func() { | ||
| if err := recover(); err != nil { | ||
| errr, _ := err.(error) | ||
| respError("execution error", errr) | ||
| return | ||
| } | ||
| }() | ||
|
|
||
| root, err := StatelessExecute(nil, v.chainConfig, witness) | ||
| if err != nil { | ||
| respError("error verifying stateless proof", err) | ||
| return | ||
| } | ||
|
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||
| w.WriteHeader(http.StatusOK) | ||
| if _, err := w.Write(root[:]); err != nil { | ||
| log.Error("error writing response", "error", err) | ||
| } | ||
| } |
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