ethclient

package
v1.14.12 Latest Latest
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 Go to latest Published: Nov 19, 2024 License: GPL-3.0 Imports: 10 Imported by: 6,987

Documentation

Overview

Package ethclient provides a client for the Ethereum RPC API.

Index

Examples

Constants

This section is empty.

Variables

This section is empty.

Functions

func RevertErrorData added in v1.14.12 

func RevertErrorData(err error) ([]byte, bool)

RevertErrorData returns the 'revert reason' data of a contract call.

This can be used with CallContract and EstimateGas, and only when the server is Geth.

Example

Here we show how to get the error message of reverted contract call. 

// First create an ethclient.Client instance.
ctx := context.Background()
ec, _ := ethclient.DialContext(ctx, exampleNode.HTTPEndpoint())

// Call the contract.
// Note we expect the call to return an error.
contract := common.HexToAddress("290f1b36649a61e369c6276f6d29463335b4400c")
call := ethereum.CallMsg{To: &contract, Gas: 30000}
result, err := ec.CallContract(ctx, call, nil)
if len(result) > 0 {
	panic("got result")
}
if err == nil {
	panic("call did not return error")
}

// Extract the low-level revert data from the error.
revertData, ok := ethclient.RevertErrorData(err)
if !ok {
	panic("unpacking revert failed")
}
fmt.Printf("revert: %x\n", revertData)

// Parse the revert data to obtain the error message.
message, err := abi.UnpackRevert(revertData)
if err != nil {
	panic("parsing ABI error failed: " + err.Error())
}
fmt.Println("message:", message)

Output:

revert: 08c379a00000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000a75736572206572726f72
message: user error

Types

type Client 

type Client struct {
	// contains filtered or unexported fields
}

Client defines typed wrappers for the Ethereum RPC API.

func Dial 

func Dial(rawurl string) (*Client, error)

Dial connects a client to the given URL.

func DialContext added in v1.8.5 

func DialContext(ctx context.Context, rawurl string) (*Client, error)

DialContext connects a client to the given URL with context.

func NewClient 

func NewClient(c *rpc.Client) *Client

NewClient creates a client that uses the given RPC client.

func (*Client) BalanceAt 

func (ec *Client) BalanceAt(ctx context.Context, account common.Address, blockNumber *big.Int) (*big.Int, error)

BalanceAt returns the wei balance of the given account. The block number can be nil, in which case the balance is taken from the latest known block.

func (*Client) BalanceAtHash added in v1.13.5 

func (ec *Client) BalanceAtHash(ctx context.Context, account common.Address, blockHash common.Hash) (*big.Int, error)

BalanceAtHash returns the wei balance of the given account.

func (*Client) BlockByHash 

func (ec *Client) BlockByHash(ctx context.Context, hash common.Hash) (*types.Block, error)

BlockByHash returns the given full block.

Note that loading full blocks requires two requests. Use HeaderByHash if you don't need all transactions or uncle headers.

func (*Client) BlockByNumber 

func (ec *Client) BlockByNumber(ctx context.Context, number *big.Int) (*types.Block, error)

BlockByNumber returns a block from the current canonical chain. If number is nil, the latest known block is returned.

Note that loading full blocks requires two requests. Use HeaderByNumber if you don't need all transactions or uncle headers.

func (*Client) BlockNumber added in v1.9.22 

func (ec *Client) BlockNumber(ctx context.Context) (uint64, error)

BlockNumber returns the most recent block number

func (*Client) BlockReceipts added in v1.13.0 

func (ec *Client) BlockReceipts(ctx context.Context, blockNrOrHash rpc.BlockNumberOrHash) ([]*types.Receipt, error)

BlockReceipts returns the receipts of a given block number or hash.

func (*Client) CallContract 

func (ec *Client) CallContract(ctx context.Context, msg ethereum.CallMsg, blockNumber *big.Int) ([]byte, error)

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.

func (*Client) CallContractAtHash added in v1.10.16 

func (ec *Client) CallContractAtHash(ctx context.Context, msg ethereum.CallMsg, blockHash common.Hash) ([]byte, error)

CallContractAtHash is almost the same as CallContract except that it selects the block by block hash instead of block height.

func (*Client) ChainID added in v1.9.0 

func (ec *Client) ChainID(ctx context.Context) (*big.Int, error)

ChainID retrieves the current chain ID for transaction replay protection.

func (*Client) Client added in v1.12.0 

func (ec *Client) Client() *rpc.Client

Client gets the underlying RPC client.

func (*Client) Close added in v1.8.5 

func (ec *Client) Close()

Close closes the underlying RPC connection.

func (*Client) CodeAt 

func (ec *Client) CodeAt(ctx context.Context, account common.Address, blockNumber *big.Int) ([]byte, error)

CodeAt returns the contract code of the given account. The block number can be nil, in which case the code is taken from the latest known block.

func (*Client) CodeAtHash added in v1.13.5 

func (ec *Client) CodeAtHash(ctx context.Context, account common.Address, blockHash common.Hash) ([]byte, error)

CodeAtHash returns the contract code of the given account.

func (*Client) EstimateGas 

func (ec *Client) EstimateGas(ctx context.Context, msg ethereum.CallMsg) (uint64, error)

EstimateGas tries to estimate the gas needed to execute a specific transaction based on the current pending state of the backend blockchain. There is no guarantee that this is the true gas limit requirement as other transactions may be added or removed by miners, but it should provide a basis for setting a reasonable default.

func (*Client) FeeHistory added in v1.10.22 

func (ec *Client) FeeHistory(ctx context.Context, blockCount uint64, lastBlock *big.Int, rewardPercentiles []float64) (*ethereum.FeeHistory, error)

FeeHistory retrieves the fee market history.

func (*Client) FilterLogs 

func (ec *Client) FilterLogs(ctx context.Context, q ethereum.FilterQuery) ([]types.Log, error)

FilterLogs executes a filter query.

func (*Client) HeaderByHash 

func (ec *Client) HeaderByHash(ctx context.Context, hash common.Hash) (*types.Header, error)

HeaderByHash returns the block header with the given hash.

func (*Client) HeaderByNumber 

func (ec *Client) HeaderByNumber(ctx context.Context, number *big.Int) (*types.Header, error)

HeaderByNumber returns a block header from the current canonical chain. If number is nil, the latest known header is returned.

func (*Client) NetworkID added in v1.7.0 

func (ec *Client) NetworkID(ctx context.Context) (*big.Int, error)

NetworkID returns the network ID for this client.

func (*Client) NonceAt 

func (ec *Client) NonceAt(ctx context.Context, account common.Address, blockNumber *big.Int) (uint64, error)

NonceAt returns the account nonce of the given account. The block number can be nil, in which case the nonce is taken from the latest known block.

func (*Client) NonceAtHash added in v1.13.5 

func (ec *Client) NonceAtHash(ctx context.Context, account common.Address, blockHash common.Hash) (uint64, error)

NonceAtHash returns the account nonce of the given account.

func (*Client) PeerCount added in v1.10.18 

func (ec *Client) PeerCount(ctx context.Context) (uint64, error)

PeerCount returns the number of p2p peers as reported by the net_peerCount method.

func (*Client) PendingBalanceAt 

func (ec *Client) PendingBalanceAt(ctx context.Context, account common.Address) (*big.Int, error)

PendingBalanceAt returns the wei balance of the given account in the pending state.

func (*Client) PendingCallContract 

func (ec *Client) PendingCallContract(ctx context.Context, msg ethereum.CallMsg) ([]byte, error)

PendingCallContract executes a message call transaction using the EVM. The state seen by the contract call is the pending state.

func (*Client) PendingCodeAt 

func (ec *Client) PendingCodeAt(ctx context.Context, account common.Address) ([]byte, error)

PendingCodeAt returns the contract code of the given account in the pending state.

func (*Client) PendingNonceAt 

func (ec *Client) PendingNonceAt(ctx context.Context, account common.Address) (uint64, error)

PendingNonceAt returns the account nonce of the given account in the pending state. This is the nonce that should be used for the next transaction.

func (*Client) PendingStorageAt 

func (ec *Client) PendingStorageAt(ctx context.Context, account common.Address, key common.Hash) ([]byte, error)

PendingStorageAt returns the value of key in the contract storage of the given account in the pending state.

func (*Client) PendingTransactionCount 

func (ec *Client) PendingTransactionCount(ctx context.Context) (uint, error)

PendingTransactionCount returns the total number of transactions in the pending state.

func (*Client) SendTransaction 

func (ec *Client) SendTransaction(ctx context.Context, tx *types.Transaction) error

SendTransaction injects a signed transaction into the pending pool for execution.

If the transaction was a contract creation use the TransactionReceipt method to get the contract address after the transaction has been mined.

func (*Client) StorageAt 

func (ec *Client) StorageAt(ctx context.Context, account common.Address, key common.Hash, blockNumber *big.Int) ([]byte, error)

StorageAt returns the value of key in the contract storage of the given account. The block number can be nil, in which case the value is taken from the latest known block.

func (*Client) StorageAtHash added in v1.13.5 

func (ec *Client) StorageAtHash(ctx context.Context, account common.Address, key common.Hash, blockHash common.Hash) ([]byte, error)

StorageAtHash returns the value of key in the contract storage of the given account.

func (*Client) SubscribeFilterLogs 

func (ec *Client) SubscribeFilterLogs(ctx context.Context, q ethereum.FilterQuery, ch chan<- types.Log) (ethereum.Subscription, error)

SubscribeFilterLogs subscribes to the results of a streaming filter query.

func (*Client) SubscribeNewHead 

func (ec *Client) SubscribeNewHead(ctx context.Context, ch chan<- *types.Header) (ethereum.Subscription, error)

SubscribeNewHead subscribes to notifications about the current blockchain head on the given channel.

func (*Client) SuggestGasPrice 

func (ec *Client) SuggestGasPrice(ctx context.Context) (*big.Int, error)

SuggestGasPrice retrieves the currently suggested gas price to allow a timely execution of a transaction.

func (*Client) SuggestGasTipCap added in v1.10.4 

func (ec *Client) SuggestGasTipCap(ctx context.Context) (*big.Int, error)

SuggestGasTipCap retrieves the currently suggested gas tip cap after 1559 to allow a timely execution of a transaction.

func (*Client) SyncProgress 

func (ec *Client) SyncProgress(ctx context.Context) (*ethereum.SyncProgress, error)

SyncProgress retrieves the current progress of the sync algorithm. If there's no sync currently running, it returns nil.

func (*Client) TransactionByHash 

func (ec *Client) TransactionByHash(ctx context.Context, hash common.Hash) (tx *types.Transaction, isPending bool, err error)

TransactionByHash returns the transaction with the given hash.

func (*Client) TransactionCount 

func (ec *Client) TransactionCount(ctx context.Context, blockHash common.Hash) (uint, error)

TransactionCount returns the total number of transactions in the given block.

func (*Client) TransactionInBlock 

func (ec *Client) TransactionInBlock(ctx context.Context, blockHash common.Hash, index uint) (*types.Transaction, error)

TransactionInBlock returns a single transaction at index in the given block.

func (*Client) TransactionReceipt 

func (ec *Client) TransactionReceipt(ctx context.Context, txHash common.Hash) (*types.Receipt, error)

TransactionReceipt returns the receipt of a transaction by transaction hash. Note that the receipt is not available for pending transactions.

func (*Client) TransactionSender added in v1.7.1 

func (ec *Client) TransactionSender(ctx context.Context, tx *types.Transaction, block common.Hash, index uint) (common.Address, error)

TransactionSender returns the sender address of the given transaction. The transaction must be known to the remote node and included in the blockchain at the given block and index. The sender is the one derived by the protocol at the time of inclusion.

There is a fast-path for transactions retrieved by TransactionByHash and TransactionInBlock. Getting their sender address can be done without an RPC interaction.

Source Files

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Directories

Path Synopsis
Package gethclient provides an RPC client for geth-specific APIs.
 Package gethclient provides an RPC client for geth-specific APIs.

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