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ethclient/gethclient: RPC client wrapper for geth-specific API (#22977)

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This commit adds the package gethclient which is similar to the ethclient
and implements some geth specific functionality.

Co-authored-by: Edgar Aroutiounian <edgar.factorial@gmail.com>
Co-authored-by: Felix Lange <fjl@twurst.com>
This commit is contained in:
Marius van der Wijden 2021-06-30 11:03:01 +02:00 committed by GitHub
parent 4fcc93d922
commit acdf9238fb
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 551 additions and 13 deletions
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24
ethclient/ethclient.go
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@ -284,17 +284,6 @@ func (ec *Client) TransactionReceipt(ctx context.Context, txHash common.Hash) (*
return r, err
}
func toBlockNumArg(number *big.Int) string {
if number == nil {
return "latest"
}
pending := big.NewInt(-1)
if number.Cmp(pending) == 0 {
return "pending"
}
return hexutil.EncodeBig(number)
}
type rpcProgress struct {
StartingBlock hexutil.Uint64
CurrentBlock hexutil.Uint64
@ -462,8 +451,6 @@ func (ec *Client) PendingTransactionCount(ctx context.Context) (uint, error) {
return uint(num), err
}
// TODO: SubscribePendingTransactions (needs server side)
// Contract Calling
// CallContract executes a message call transaction, which is directly executed in the VM
@ -537,6 +524,17 @@ func (ec *Client) SendTransaction(ctx context.Context, tx *types.Transaction) er
return ec.c.CallContext(ctx, nil, "eth_sendRawTransaction", hexutil.Encode(data))
}
func toBlockNumArg(number *big.Int) string {
if number == nil {
return "latest"
}
pending := big.NewInt(-1)
if number.Cmp(pending) == 0 {
return "pending"
}
return hexutil.EncodeBig(number)
}
func toCallArg(msg ethereum.CallMsg) interface{} {
arg := map[string]interface{}{
"from": msg.From,

235
ethclient/gethclient/gethclient.go Normal file
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@ -0,0 +1,235 @@
// Copyright 2021 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// Package gethclient provides an RPC client for geth-specific APIs.
package gethclient
import (
"context"
"math/big"
"runtime"
"runtime/debug"
"github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/rpc"
)
// Client is a wrapper around rpc.Client that implements geth-specific functionality.
//
// If you want to use the standardized Ethereum RPC functionality, use ethclient.Client instead.
type Client struct {
c *rpc.Client
}
// New creates a client that uses the given RPC client.
func New(c *rpc.Client) *Client {
return &Client{c}
}
// CreateAccessList tries to create an access list for a specific transaction based on the
// current pending state of the blockchain.
func (ec *Client) CreateAccessList(ctx context.Context, msg ethereum.CallMsg) (*types.AccessList, uint64, string, error) {
type accessListResult struct {
Accesslist *types.AccessList `json:"accessList"`
Error string `json:"error,omitempty"`
GasUsed hexutil.Uint64 `json:"gasUsed"`
}
var result accessListResult
if err := ec.c.CallContext(ctx, &result, "eth_createAccessList", toCallArg(msg)); err != nil {
return nil, 0, "", err
}
return result.Accesslist, uint64(result.GasUsed), result.Error, nil
}
// AccountResult is the result of a GetProof operation.
type AccountResult struct {
Address common.Address `json:"address"`
AccountProof []string `json:"accountProof"`
Balance *big.Int `json:"balance"`
CodeHash common.Hash `json:"codeHash"`
Nonce uint64 `json:"nonce"`
StorageHash common.Hash `json:"storageHash"`
StorageProof []StorageResult `json:"storageProof"`
}
// StorageResult provides a proof for a key-value pair.
type StorageResult struct {
Key string `json:"key"`
Value *big.Int `json:"value"`
Proof []string `json:"proof"`
}
// GetProof returns the account and storage values of the specified account including the Merkle-proof.
// The block number can be nil, in which case the value is taken from the latest known block.
func (ec *Client) GetProof(ctx context.Context, account common.Address, keys []string, blockNumber *big.Int) (*AccountResult, error) {
type storageResult struct {
Key string `json:"key"`
Value *hexutil.Big `json:"value"`
Proof []string `json:"proof"`
}
type accountResult struct {
Address common.Address `json:"address"`
AccountProof []string `json:"accountProof"`
Balance *hexutil.Big `json:"balance"`
CodeHash common.Hash `json:"codeHash"`
Nonce hexutil.Uint64 `json:"nonce"`
StorageHash common.Hash `json:"storageHash"`
StorageProof []storageResult `json:"storageProof"`
}
var res accountResult
err := ec.c.CallContext(ctx, &res, "eth_getProof", account, keys, toBlockNumArg(blockNumber))
// Turn hexutils back to normal datatypes
storageResults := make([]StorageResult, 0, len(res.StorageProof))
for _, st := range res.StorageProof {
storageResults = append(storageResults, StorageResult{
Key: st.Key,
Value: st.Value.ToInt(),
Proof: st.Proof,
})
}
result := AccountResult{
Address: res.Address,
AccountProof: res.AccountProof,
Balance: res.Balance.ToInt(),
Nonce: uint64(res.Nonce),
CodeHash: res.CodeHash,
StorageHash: res.StorageHash,
}
return &result, err
}
// OverrideAccount specifies the state of an account to be overridden.
type OverrideAccount struct {
Nonce uint64 `json:"nonce"`
Code []byte `json:"code"`
Balance *big.Int `json:"balance"`
State map[common.Hash]common.Hash `json:"state"`
StateDiff map[common.Hash]common.Hash `json:"stateDiff"`
}
// CallContract executes a message call transaction, which is directly executed in the VM
// of the node, but never mined into the blockchain.
//
// blockNumber selects the block height at which the call runs. It can be nil, in which
// case the code is taken from the latest known block. Note that state from very old
// blocks might not be available.
//
// overrides specifies a map of contract states that should be overwritten before executing
// the message call.
// Please use ethclient.CallContract instead if you don't need the override functionality.
func (ec *Client) CallContract(ctx context.Context, msg ethereum.CallMsg, blockNumber *big.Int, overrides *map[common.Address]OverrideAccount) ([]byte, error) {
var hex hexutil.Bytes
err := ec.c.CallContext(
ctx, &hex, "eth_call", toCallArg(msg),
toBlockNumArg(blockNumber), toOverrideMap(overrides),
)
return hex, err
}
// GCStats retrieves the current garbage collection stats from a geth node.
func (ec *Client) GCStats(ctx context.Context) (*debug.GCStats, error) {
var result debug.GCStats
err := ec.c.CallContext(ctx, &result, "debug_gcStats")
return &result, err
}
// MemStats retrieves the current memory stats from a geth node.
func (ec *Client) MemStats(ctx context.Context) (*runtime.MemStats, error) {
var result runtime.MemStats
err := ec.c.CallContext(ctx, &result, "debug_memStats")
return &result, err
}
// SetHead sets the current head of the local chain by block number.
// Note, this is a destructive action and may severely damage your chain.
// Use with extreme caution.
func (ec *Client) SetHead(ctx context.Context, number *big.Int) error {
return ec.c.CallContext(ctx, nil, "debug_setHead", toBlockNumArg(number))
}
// GetNodeInfo retrieves the node info of a geth node.
func (ec *Client) GetNodeInfo(ctx context.Context) (*p2p.NodeInfo, error) {
var result p2p.NodeInfo
err := ec.c.CallContext(ctx, &result, "admin_nodeInfo")
return &result, err
}
// SubscribePendingTransactions subscribes to new pending transactions.
func (ec *Client) SubscribePendingTransactions(ctx context.Context, ch chan<- common.Hash) (*rpc.ClientSubscription, error) {
return ec.c.EthSubscribe(ctx, ch, "newPendingTransactions")
}
func toBlockNumArg(number *big.Int) string {
if number == nil {
return "latest"
}
pending := big.NewInt(-1)
if number.Cmp(pending) == 0 {
return "pending"
}
return hexutil.EncodeBig(number)
}
func toCallArg(msg ethereum.CallMsg) interface{} {
arg := map[string]interface{}{
"from": msg.From,
"to": msg.To,
}
if len(msg.Data) > 0 {
arg["data"] = hexutil.Bytes(msg.Data)
}
if msg.Value != nil {
arg["value"] = (*hexutil.Big)(msg.Value)
}
if msg.Gas != 0 {
arg["gas"] = hexutil.Uint64(msg.Gas)
}
if msg.GasPrice != nil {
arg["gasPrice"] = (*hexutil.Big)(msg.GasPrice)
}
return arg
}
func toOverrideMap(overrides *map[common.Address]OverrideAccount) interface{} {
if overrides == nil {
return nil
}
type overrideAccount struct {
Nonce hexutil.Uint64 `json:"nonce"`
Code hexutil.Bytes `json:"code"`
Balance *hexutil.Big `json:"balance"`
State map[common.Hash]common.Hash `json:"state"`
StateDiff map[common.Hash]common.Hash `json:"stateDiff"`
}
result := make(map[common.Address]overrideAccount)
for addr, override := range *overrides {
result[addr] = overrideAccount{
Nonce: hexutil.Uint64(override.Nonce),
Code: override.Code,
Balance: (*hexutil.Big)(override.Balance),
State: override.State,
StateDiff: override.StateDiff,
}
}
return &result
}

305
ethclient/gethclient/gethclient_test.go Normal file
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@ -0,0 +1,305 @@
// Copyright 2021 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package gethclient
import (
"bytes"
"context"
"math/big"
"testing"
"github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/common"
"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/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/eth"
"github.com/ethereum/go-ethereum/eth/ethconfig"
"github.com/ethereum/go-ethereum/ethclient"
"github.com/ethereum/go-ethereum/node"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/rpc"
)
var (
testKey, _ = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
testAddr = crypto.PubkeyToAddress(testKey.PublicKey)
testBalance = big.NewInt(2e10)
)
func newTestBackend(t *testing.T) (*node.Node, []*types.Block) {
// Generate test chain.
genesis, blocks := generateTestChain()
// Create node
n, err := node.New(&node.Config{})
if err != nil {
t.Fatalf("can't create new node: %v", err)
}
// Create Ethereum Service
config := &ethconfig.Config{Genesis: genesis}
config.Ethash.PowMode = ethash.ModeFake
ethservice, err := eth.New(n, config)
if err != nil {
t.Fatalf("can't create new ethereum service: %v", err)
}
// Import the test chain.
if err := n.Start(); err != nil {
t.Fatalf("can't start test node: %v", err)
}
if _, err := ethservice.BlockChain().InsertChain(blocks[1:]); err != nil {
t.Fatalf("can't import test blocks: %v", err)
}
return n, blocks
}
func generateTestChain() (*core.Genesis, []*types.Block) {
db := rawdb.NewMemoryDatabase()
config := params.AllEthashProtocolChanges
genesis := &core.Genesis{
Config: config,
Alloc: core.GenesisAlloc{testAddr: {Balance: testBalance}},
ExtraData: []byte("test genesis"),
Timestamp: 9000,
}
generate := func(i int, g *core.BlockGen) {
g.OffsetTime(5)
g.SetExtra([]byte("test"))
}
gblock := genesis.ToBlock(db)
engine := ethash.NewFaker()
blocks, _ := core.GenerateChain(config, gblock, engine, db, 1, generate)
blocks = append([]*types.Block{gblock}, blocks...)
return genesis, blocks
}
func TestEthClient(t *testing.T) {
backend, _ := newTestBackend(t)
client, err := backend.Attach()
if err != nil {
t.Fatal(err)
}
defer backend.Close()
defer client.Close()
tests := map[string]struct {
test func(t *testing.T)
}{
"TestAccessList": {
func(t *testing.T) { testAccessList(t, client) },
},
"TestGetProof": {
func(t *testing.T) { testGetProof(t, client) },
},
"TestGCStats": {
func(t *testing.T) { testGCStats(t, client) },
},
"TestMemStats": {
func(t *testing.T) { testMemStats(t, client) },
},
"TestGetNodeInfo": {
func(t *testing.T) { testGetNodeInfo(t, client) },
},
"TestSetHead": {
func(t *testing.T) { testSetHead(t, client) },
},
"TestSubscribePendingTxs": {
func(t *testing.T) { testSubscribePendingTransactions(t, client) },
},
"TestCallContract": {
func(t *testing.T) { testCallContract(t, client) },
},
}
t.Parallel()
for name, tt := range tests {
t.Run(name, tt.test)
}
}
func testAccessList(t *testing.T, client *rpc.Client) {
ec := New(client)
// Test transfer
msg := ethereum.CallMsg{
From: testAddr,
To: &common.Address{},
Gas: 21000,
GasPrice: big.NewInt(1),
Value: big.NewInt(1),
}
al, gas, vmErr, err := ec.CreateAccessList(context.Background(), msg)
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
if vmErr != "" {
t.Fatalf("unexpected vm error: %v", vmErr)
}
if gas != 21000 {
t.Fatalf("unexpected gas used: %v", gas)
}
if len(*al) != 0 {
t.Fatalf("unexpected length of accesslist: %v", len(*al))
}
// Test reverting transaction
msg = ethereum.CallMsg{
From: testAddr,
To: nil,
Gas: 100000,
GasPrice: big.NewInt(1),
Value: big.NewInt(1),
Data: common.FromHex("0x608060806080608155fd"),
}
al, gas, vmErr, err = ec.CreateAccessList(context.Background(), msg)
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
if vmErr == "" {
t.Fatalf("wanted vmErr, got none")
}
if gas == 21000 {
t.Fatalf("unexpected gas used: %v", gas)
}
if len(*al) != 1 || al.StorageKeys() != 1 {
t.Fatalf("unexpected length of accesslist: %v", len(*al))
}
// address changes between calls, so we can't test for it.
if (*al)[0].Address == common.HexToAddress("0x0") {
t.Fatalf("unexpected address: %v", (*al)[0].Address)
}
if (*al)[0].StorageKeys[0] != common.HexToHash("0x0000000000000000000000000000000000000000000000000000000000000081") {
t.Fatalf("unexpected storage key: %v", (*al)[0].StorageKeys[0])
}
}
func testGetProof(t *testing.T, client *rpc.Client) {
ec := New(client)
ethcl := ethclient.NewClient(client)
result, err := ec.GetProof(context.Background(), testAddr, []string{}, nil)
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(result.Address[:], testAddr[:]) {
t.Fatalf("unexpected address, want: %v got: %v", testAddr, result.Address)
}
// test nonce
nonce, _ := ethcl.NonceAt(context.Background(), result.Address, nil)
if result.Nonce != nonce {
t.Fatalf("invalid nonce, want: %v got: %v", nonce, result.Nonce)
}
// test balance
balance, _ := ethcl.BalanceAt(context.Background(), result.Address, nil)
if result.Balance.Cmp(balance) != 0 {
t.Fatalf("invalid balance, want: %v got: %v", balance, result.Balance)
}
}
func testGCStats(t *testing.T, client *rpc.Client) {
ec := New(client)
_, err := ec.GCStats(context.Background())
if err != nil {
t.Fatal(err)
}
}
func testMemStats(t *testing.T, client *rpc.Client) {
ec := New(client)
stats, err := ec.MemStats(context.Background())
if err != nil {
t.Fatal(err)
}
if stats.Alloc == 0 {
t.Fatal("Invalid mem stats retrieved")
}
}
func testGetNodeInfo(t *testing.T, client *rpc.Client) {
ec := New(client)
info, err := ec.GetNodeInfo(context.Background())
if err != nil {
t.Fatal(err)
}
if info.Name == "" {
t.Fatal("Invalid node info retrieved")
}
}
func testSetHead(t *testing.T, client *rpc.Client) {
ec := New(client)
err := ec.SetHead(context.Background(), big.NewInt(0))
if err != nil {
t.Fatal(err)
}
}
func testSubscribePendingTransactions(t *testing.T, client *rpc.Client) {
ec := New(client)
ethcl := ethclient.NewClient(client)
// Subscribe to Transactions
ch := make(chan common.Hash)
ec.SubscribePendingTransactions(context.Background(), ch)
// Send a transaction
chainID, err := ethcl.ChainID(context.Background())
if err != nil {
t.Fatal(err)
}
// Create transaction
tx := types.NewTransaction(0, common.Address{1}, big.NewInt(1), 22000, big.NewInt(1), nil)
signer := types.LatestSignerForChainID(chainID)
signature, err := crypto.Sign(signer.Hash(tx).Bytes(), testKey)
if err != nil {
t.Fatal(err)
}
signedTx, err := tx.WithSignature(signer, signature)
if err != nil {
t.Fatal(err)
}
// Send transaction
err = ethcl.SendTransaction(context.Background(), signedTx)
if err != nil {
t.Fatal(err)
}
// Check that the transaction was send over the channel
hash := <-ch
if hash != signedTx.Hash() {
t.Fatalf("Invalid tx hash received, got %v, want %v", hash, signedTx.Hash())
}
}
func testCallContract(t *testing.T, client *rpc.Client) {
ec := New(client)
msg := ethereum.CallMsg{
From: testAddr,
To: &common.Address{},
Gas: 21000,
GasPrice: big.NewInt(1),
Value: big.NewInt(1),
}
// CallContract without override
if _, err := ec.CallContract(context.Background(), msg, big.NewInt(0), nil); err != nil {
t.Fatalf("unexpected error: %v", err)
}
// CallContract with override
override := OverrideAccount{
Nonce: 1,
}
mapAcc := make(map[common.Address]OverrideAccount)
mapAcc[testAddr] = override
if _, err := ec.CallContract(context.Background(), msg, big.NewInt(0), &mapAcc); err != nil {
t.Fatalf("unexpected error: %v", err)
}
}