plugeth/ethclient/gethclient/gethclient.go

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// 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"
"encoding/json"
"fmt"
"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"`
}
// Avoid keys being 'null'.
if keys == nil {
keys = []string{}
}
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,
StorageProof: storageResults,
}
return &result, err
}
// 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), overrides,
)
return hex, err
}
// CallContractWithBlockOverrides 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.
//
// blockOverrides specifies block fields exposed to the EVM that can be overridden for the call.
//
// Please use ethclient.CallContract instead if you don't need the override functionality.
func (ec *Client) CallContractWithBlockOverrides(ctx context.Context, msg ethereum.CallMsg, blockNumber *big.Int, overrides *map[common.Address]OverrideAccount, blockOverrides BlockOverrides) ([]byte, error) {
var hex hexutil.Bytes
err := ec.c.CallContext(
ctx, &hex, "eth_call", toCallArg(msg),
toBlockNumArg(blockNumber), overrides, blockOverrides,
)
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
}
// SubscribeFullPendingTransactions subscribes to new pending transactions.
func (ec *Client) SubscribeFullPendingTransactions(ctx context.Context, ch chan<- *types.Transaction) (*rpc.ClientSubscription, error) {
return ec.c.EthSubscribe(ctx, ch, "newPendingTransactions", true)
}
// SubscribePendingTransactions subscribes to new pending transaction hashes.
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"
}
if number.Sign() >= 0 {
return hexutil.EncodeBig(number)
}
// It's negative.
if number.IsInt64() {
return rpc.BlockNumber(number.Int64()).String()
}
// It's negative and large, which is invalid.
return fmt.Sprintf("<invalid %d>", 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
}
// OverrideAccount specifies the state of an account to be overridden.
type OverrideAccount struct {
// Nonce sets nonce of the account. Note: the nonce override will only
// be applied when it is set to a non-zero value.
Nonce uint64
// Code sets the contract code. The override will be applied
// when the code is non-nil, i.e. setting empty code is possible
// using an empty slice.
Code []byte
// Balance sets the account balance.
Balance *big.Int
// State sets the complete storage. The override will be applied
// when the given map is non-nil. Using an empty map wipes the
// entire contract storage during the call.
State map[common.Hash]common.Hash
// StateDiff allows overriding individual storage slots.
StateDiff map[common.Hash]common.Hash
}
func (a OverrideAccount) MarshalJSON() ([]byte, error) {
type acc struct {
Nonce hexutil.Uint64 `json:"nonce,omitempty"`
Code string `json:"code,omitempty"`
Balance *hexutil.Big `json:"balance,omitempty"`
State interface{} `json:"state,omitempty"`
StateDiff map[common.Hash]common.Hash `json:"stateDiff,omitempty"`
}
output := acc{
Nonce: hexutil.Uint64(a.Nonce),
Balance: (*hexutil.Big)(a.Balance),
StateDiff: a.StateDiff,
}
if a.Code != nil {
output.Code = hexutil.Encode(a.Code)
}
if a.State != nil {
output.State = a.State
}
return json.Marshal(output)
}
// BlockOverrides specifies the set of header fields to override.
type BlockOverrides struct {
// Number overrides the block number.
Number *big.Int
// Difficulty overrides the block difficulty.
Difficulty *big.Int
// Time overrides the block timestamp. Time is applied only when
// it is non-zero.
Time uint64
// GasLimit overrides the block gas limit. GasLimit is applied only when
// it is non-zero.
GasLimit uint64
// Coinbase overrides the block coinbase. Coinbase is applied only when
// it is different from the zero address.
Coinbase common.Address
// Random overrides the block extra data which feeds into the RANDOM opcode.
// Random is applied only when it is a non-zero hash.
Random common.Hash
// BaseFee overrides the block base fee.
BaseFee *big.Int
}
func (o BlockOverrides) MarshalJSON() ([]byte, error) {
type override struct {
Number *hexutil.Big `json:"number,omitempty"`
Difficulty *hexutil.Big `json:"difficulty,omitempty"`
Time hexutil.Uint64 `json:"time,omitempty"`
GasLimit hexutil.Uint64 `json:"gasLimit,omitempty"`
Coinbase *common.Address `json:"coinbase,omitempty"`
Random *common.Hash `json:"random,omitempty"`
BaseFee *hexutil.Big `json:"baseFee,omitempty"`
}
output := override{
Number: (*hexutil.Big)(o.Number),
Difficulty: (*hexutil.Big)(o.Difficulty),
Time: hexutil.Uint64(o.Time),
GasLimit: hexutil.Uint64(o.GasLimit),
BaseFee: (*hexutil.Big)(o.BaseFee),
}
if o.Coinbase != (common.Address{}) {
output.Coinbase = &o.Coinbase
}
if o.Random != (common.Hash{}) {
output.Random = &o.Random
}
return json.Marshal(output)
}