| id | title | custom_edit_url | keywords | |||
|---|---|---|---|---|---|---|
go_sdk |
Golang SDK |
|
The go-conflux-sdk module is a collection of packages which contain specific functionality for the conflux ecosystem.
- The package
sdkis for interacting with conflux chain, account manager and operating smart contracts - The package
utilscontains useful helper functions for Dapp developers.
You can get Conflux Golang API directly or use go module as below
go get github.com/Conflux-Chain/go-conflux-sdk
You can also add the Conflux Golang API into vendor folder.
govendor fetch github.com/Conflux-Chain/go-conflux-sdk
After that you need to create a client instance with node url and an account manager instance.
url:= "http://testnet-jsonrpc.conflux-chain.org:12537"
client, err := sdk.NewClient(url)
if err != nil {
fmt.Println("new client error:", err)
return
}
am := sdk.NewAccountManager("./keystore")
client.SetAccountManager(am)import "."
type AccountManager struct {
}AccountManager manages Conflux accounts.
func NewAccountManager(keydir string, networkID uint32) *AccountManagerNewAccountManager creates an instance of AccountManager based on the keystore directory "keydir".
func (m *AccountManager) Create(passphrase string) (address types.Address, err error)Create creates a new account and puts the keystore file into keystore directory
func (m *AccountManager) CreateEthCompatible(passphrase string) (address types.Address, err error)CreateEthCompatible creates a new account compatible with eth and puts the keystore file into keystore directory
func (m *AccountManager) Delete(address types.Address, passphrase string) errorDelete deletes the specified account and remove the keystore file from keystore directory.
func (m *AccountManager) Export(address types.Address, passphrase string) (string, error)Export exports private key string of address
func (m *AccountManager) GetDefault() (*types.Address, error)GetDefault return first account in keystore directory
func (m *AccountManager) Import(keyFile, passphrase, newPassphrase string) (address types.Address, err error)Import imports account from external key file to keystore directory. Returns error if the account already exists.
func (m *AccountManager) ImportKey(keyString string, passphrase string) (address types.Address, err error)ImportKey import account from private key hex string and save to keystore directory
func (m *AccountManager) List() []types.AddressList lists all accounts in keystore directory.
func (m *AccountManager) Lock(address types.Address) errorLock locks the specified account.
func (m *AccountManager) Sign(tx types.UnsignedTransaction, passphrase string) (v byte, r, s []byte, err error)Sign signs tx by passphrase and returns the signature
func (m *AccountManager) SignAndEcodeTransactionWithPassphrase(tx types.UnsignedTransaction, passphrase string) ([]byte, error)SignAndEcodeTransactionWithPassphrase signs tx with given passphrase and return its RLP encoded data.
func (m *AccountManager) SignTransaction(tx types.UnsignedTransaction) ([]byte, error)SignTransaction signs tx and returns its RLP encoded data.
func (m *AccountManager) SignTransactionWithPassphrase(tx types.UnsignedTransaction, passphrase string) (types.SignedTransaction, error)SignTransactionWithPassphrase signs tx with given passphrase and returns a transction with signature
func (m *AccountManager) TimedUnlock(address types.Address, passphrase string, timeout time.Duration) errorTimedUnlock unlocks the specified account for a period of time.
func (m *AccountManager) TimedUnlockDefault(passphrase string, timeout time.Duration) errorTimedUnlockDefault unlocks the specified account for a period of time.
func (m *AccountManager) Unlock(address types.Address, passphrase string) errorUnlock unlocks the specified account indefinitely.
func (m *AccountManager) UnlockDefault(passphrase string) errorUnlockDefault unlocks the default account indefinitely.
func (m *AccountManager) Update(address types.Address, passphrase, newPassphrase string) errorUpdate updates the passphrase of specified account.
type Client struct {
AccountManager AccountManagerOperator
}Client represents a client to interact with Conflux blockchain.
func NewClient(nodeURL string, option ...ClientOption) (*Client, error)NewClient creates an instance of Client with specified conflux node url, it will creat account manager if option.KeystorePath not empty.
func NewClientWithRPCRequester(rpcRequester RpcRequester) (*Client, error)NewClientWithRPCRequester creates client with specified rpcRequester
func (client *Client) ApplyUnsignedTransactionDefault(tx *types.UnsignedTransaction) errorApplyUnsignedTransactionDefault set empty fields to value fetched from conflux node.
func (client *Client) BatchCallRPC(b []rpc.BatchElem) errorBatchCallRPC sends all given requests as a single batch and waits for the server to return a response for all of them.
In contrast to Call, BatchCall only returns I/O errors. Any error specific to a request is reported through the Error field of the corresponding BatchElem.
Note that batch calls may not be executed atomically on the server side.
func (client *Client) BatchGetBlockConfirmationRisk(blockhashes []types.Hash) (map[types.Hash]*big.Float, error)BatchGetBlockConfirmationRisk acquires confirmation risk informations in bulk by blockhashes
func (client *Client) BatchGetBlockSummarys(blockhashes []types.Hash) (map[types.Hash]*types.BlockSummary, error)BatchGetBlockSummarys requests block summary informations in bulk by blockhashes
func (client *Client) BatchGetRawBlockConfirmationRisk(blockhashes []types.Hash) (map[types.Hash]*big.Int, error)BatchGetRawBlockConfirmationRisk requests raw confirmation risk informations in bulk by blockhashes
func (client *Client) BatchGetTxByHashes(txhashes []types.Hash) (map[types.Hash]*types.Transaction, error)BatchGetTxByHashes requests transaction informations in bulk by txhashes
func (client *Client) Call(request types.CallRequest, epoch *types.Epoch) (result hexutil.Bytes, err error)Call executes a message call transaction "request" at specified epoch, which is directly executed in the VM of the node, but never mined into the block chain and returns the contract execution result.
func (client *Client) CallRPC(result interface{}, method string, args ...interface{}) errorCallRPC performs a JSON-RPC call with the given arguments and unmarshals into result if no error occurred.
The result must be a pointer so that package json can unmarshal into it. You can also pass nil, in which case the result is ignored.
func (client *Client) CheckBalanceAgainstTransaction(accountAddress types.Address,
contractAddress types.Address,
gasLimit *hexutil.Big,
gasPrice *hexutil.Big,
storageLimit *hexutil.Big,
epoch ...*types.Epoch) (response types.CheckBalanceAgainstTransactionResponse, err error)CheckBalanceAgainstTransaction checks if user balance is enough for the transaction.
func (client *Client) Close()Close closes the client, aborting any in-flight requests.
func (client *Client) CreateUnsignedTransaction(from types.Address, to types.Address, amount *hexutil.Big, data []byte) (types.UnsignedTransaction, error)CreateUnsignedTransaction creates an unsigned transaction by parameters, and the other fields will be set to values fetched from conflux node.
func (client *Client) DeployContract(option *types.ContractDeployOption, abiJSON []byte,
bytecode []byte, constroctorParams ...interface{}) *ContractDeployResultDeployContract deploys a contract by abiJSON, bytecode and consturctor params. It returns a ContractDeployState instance which contains 3 channels for notifying when state changed.
func (client *Client) EstimateGasAndCollateral(request types.CallRequest, epoch ...*types.Epoch) (estimat types.Estimate, err error)EstimateGasAndCollateral excutes a message call "request" and returns the amount of the gas used and storage for collateral
func (client *Client) FilterTraces(traceFilter types.TraceFilter) (traces []types.LocalizedTrace, err error)GetFilterTraces returns all traces matching the provided filter.
func (client *Client) GetAccountInfo(account types.Address, epoch ...*types.Epoch) (accountInfo types.AccountInfo, err error)GetAccountInfo returns account related states of the given account
func (client *Client) GetAccountPendingInfo(address types.Address) (pendignInfo *types.AccountPendingInfo, err error)GetAccountPendingInfo gets transaction pending info by account address
func (client *Client) GetAccumulateInterestRate(epoch ...*types.Epoch) (intersetRate *hexutil.Big, err error)GetAccumulateInterestRate returns accumulate interest rate of the given epoch
func (client *Client) GetAdmin(contractAddress types.Address, epoch ...*types.Epoch) (admin *types.Address, err error)GetAdmin returns admin of the given contract, it will return nil if contract not exist
func (client *Client) GetBalance(address types.Address, epoch ...*types.Epoch) (balance *hexutil.Big, err error)GetBalance returns the balance of specified address at epoch.
func (client *Client) GetBestBlockHash() (hash types.Hash, err error)GetBestBlockHash returns the current best block hash.
func (client *Client) GetBlockByEpoch(epoch *types.Epoch) (block *types.Block, err error)GetBlockByEpoch returns the block of specified epoch. If the epoch is invalid, return the concrete error.
func (client *Client) GetBlockByHash(blockHash types.Hash) (block *types.Block, err error)GetBlockByHash returns the block of specified blockHash If the block is not found, return nil.
func (client *Client) GetBlockByHashWithPivotAssumption(blockHash types.Hash, pivotHash types.Hash, epoch hexutil.Uint64) (block types.Block, err error)GetBlockByHashWithPivotAssumption returns block with given hash and pivot chain assumption.
func (client *Client) GetBlockConfirmationRisk(blockHash types.Hash) (*big.Float, error)GetBlockConfirmationRisk indicates the probability that the pivot block of the epoch where the block is located becomes a normal block.
it's (raw confirmation risk coefficient/ (2^256-1))
func (client *Client) GetBlockRewardInfo(epoch types.Epoch) (rewardInfo []types.RewardInfo, err error)GetBlockRewardInfo returns block reward information in an epoch
func (client *Client) GetBlockSummaryByEpoch(epoch *types.Epoch) (blockSummary *types.BlockSummary, err error)GetBlockSummaryByEpoch returns the block summary of specified epoch. If the epoch is invalid, return the concrete error.
func (client *Client) GetBlockSummaryByHash(blockHash types.Hash) (blockSummary *types.BlockSummary, err error)GetBlockSummaryByHash returns the block summary of specified blockHash If the block is not found, return nil.
func (client *Client) GetBlockTraces(blockHash types.Hash) (traces *types.LocalizedBlockTrace, err error)GetBlockTrace returns all traces produced at given block.
func (client *Client) GetBlocksByEpoch(epoch *types.Epoch) (blockHashes []types.Hash, err error)GetBlocksByEpoch returns the blocks hash in the specified epoch.
func (client *Client) GetClientVersion() (clientVersion string, err error)GetClientVersion returns the client version as a string
func (client *Client) GetCode(address types.Address, epoch ...*types.Epoch) (code hexutil.Bytes, err error)GetCode returns the bytecode in HEX format of specified address at epoch.
func (client *Client) GetCollateralForStorage(account types.Address, epoch ...*types.Epoch) (storage *hexutil.Big, err error)GetCollateralForStorage returns balance of the given account.
func (client *Client) GetContract(abiJSON []byte, deployedAt *types.Address) (*Contract, error)GetContract creates a contract instance according to abi json and it's deployed address
func (client *Client) GetDepositList(address types.Address, epoch ...*types.Epoch) (depositInfos []types.DepositInfo, err error)GetDepositList returns deposit list of the given account.
func (client *Client) GetEpochNumber(epoch ...*types.Epoch) (epochNumber *hexutil.Big, err error)GetEpochNumber returns the highest or specified epoch number.
func (client *Client) GetEpochReceipts(epoch types.Epoch) (receipts [][]types.TransactionReceipt, err error)func (client *Client) GetGasPrice() (gasPrice *hexutil.Big, err error)GetGasPrice returns the recent mean gas price.
func (client *Client) GetInterestRate(epoch ...*types.Epoch) (intersetRate *hexutil.Big, err error)GetInterestRate returns interest rate of the given epoch
func (client *Client) GetLogs(filter types.LogFilter) (logs []types.Log, err error)GetLogs returns logs that matching the specified filter.
func (client *Client) GetNetworkID() (uint32, error)GetNetworkID returns networkID of connecting conflux node
func (client *Client) GetNextNonce(address types.Address, epoch ...*types.Epoch) (nonce *hexutil.Big, err error)GetNextNonce returns the next transaction nonce of address
func (client *Client) GetNodeURL() stringGetNodeURL returns node url
func (client *Client) GetRawBlockConfirmationRisk(blockhash types.Hash) (risk *hexutil.Big, err error)GetRawBlockConfirmationRisk indicates the risk coefficient that the pivot block of the epoch where the block is located becomes a normal block. It will return nil if block not exist
func (client *Client) GetSkippedBlocksByEpoch(epoch *types.Epoch) (blockHashs []types.Hash, err error)GetSkippedBlocksByEpoch returns skipped block hashes of given epoch
func (client *Client) GetSponsorInfo(contractAddress types.Address, epoch ...*types.Epoch) (sponsor types.SponsorInfo, err error)GetSponsorInfo returns sponsor information of the given contract
func (client *Client) GetStakingBalance(account types.Address, epoch ...*types.Epoch) (balance *hexutil.Big, err error)GetStakingBalance returns balance of the given account.
func (client *Client) GetStatus() (status types.Status, err error)GetStatus returns status of connecting conflux node
func (client *Client) GetStorageAt(address types.Address, position types.Hash, epoch ...*types.Epoch) (storageEntries hexutil.Bytes, err error)GetStorageAt returns storage entries from a given contract.
func (client *Client) GetStorageRoot(address types.Address, epoch ...*types.Epoch) (storageRoot *types.StorageRoot, err error)GetStorageRoot returns storage root of given address
func (client *Client) GetSupplyInfo(epoch ...*types.Epoch) (info types.TokenSupplyInfo, err error)GetSupplyInfo Return information about total token supply.
func (client *Client) GetTransactionByHash(txHash types.Hash) (tx *types.Transaction, err error)GetTransactionByHash returns transaction for the specified txHash. If the transaction is not found, return nil.
func (client *Client) GetTransactionReceipt(txHash types.Hash) (receipt *types.TransactionReceipt, err error)GetTransactionReceipt returns the receipt of specified transaction hash. If no receipt is found, return nil.
func (client *Client) GetTransactionTraces(txHash types.Hash) (traces []types.LocalizedTrace, err error)GetTransactionTraces returns all traces produced at the given transaction.
func (client *Client) GetVoteList(address types.Address, epoch ...*types.Epoch) (voteStakeInfos []types.VoteStakeInfo, err error)GetVoteList returns vote list of the given account.
func (client *Client) MustNewAddress(base32OrHex string) types.AddressMustNewAddress create conflux address by base32 string or hex40 string, if base32OrHex is base32 and networkID is passed it will create cfx Address use networkID of current client. it will painc if error occured.
func (client *Client) NewAddress(base32OrHex string) (types.Address, error)NewAddress create conflux address by base32 string or hex40 string, if base32OrHex is base32 and networkID is passed it will create cfx Address use networkID of current client.
func (client *Client) SendRawTransaction(rawData []byte) (types.Hash, error)SendRawTransaction sends signed transaction and returns its hash.
func (client *Client) SendTransaction(tx types.UnsignedTransaction) (types.Hash, error)SendTransaction signs and sends transaction to conflux node and returns the transaction hash.
func (client *Client) SetAccountManager(accountManager AccountManagerOperator)SetAccountManager sets account manager for sign transaction
func (client *Client) SignEncodedTransactionAndSend(encodedTx []byte, v byte, r, s []byte) (*types.Transaction, error)SignEncodedTransactionAndSend signs RLP encoded transaction "encodedTx" by signature "r,s,v" and sends it to node, and returns responsed transaction.
func (client *Client) SubscribeEpochs(channel chan types.WebsocketEpochResponse, subscriptionEpochType ...types.Epoch) (*rpc.ClientSubscription, error)SubscribeEpochs subscribes consensus results: the total order of blocks, as expressed by a sequence of epochs. Currently subscriptionEpochType only support "latest_mined" and "latest_state"
func (client *Client) SubscribeLogs(logChannel chan types.Log, chainReorgChannel chan types.ChainReorg, filter types.LogFilter) (*rpc.ClientSubscription, error)SubscribeLogs subscribes all logs matching a certain filter, in order.
func (client *Client) SubscribeNewHeads(channel chan types.BlockHeader) (*rpc.ClientSubscription, error)SubscribeNewHeads subscribes all new block headers participating in the consensus.
func (client *Client) WaitForTransationBePacked(txhash types.Hash, duration time.Duration) (*types.Transaction, error)WaitForTransationBePacked returns transaction when it is packed
func (client *Client) WaitForTransationReceipt(txhash types.Hash, duration time.Duration) (*types.TransactionReceipt, error)WaitForTransationReceipt waits for transaction receipt valid
type ClientOption struct {
KeystorePath string
RetryCount int
RetryInterval time.Duration
CallRpcLog func(method string, args []interface{}, result interface{}, resultError error, duration time.Duration)
BatchCallRPCLog func(b []rpc.BatchElem, err error, duration time.Duration)
}ClientOption for set keystore path and flags for retry
The simplest way to set logger is to use the types.DefaultCallRpcLog and types.DefaultBatchCallRPCLog
type Contract struct {
ABI abi.ABI
Client ClientOperator
Address *types.Address
}Contract represents a smart contract. You can conveniently create contract by Client.GetContract or Client.DeployContract.
func NewContract(abiJSON []byte, client ClientOperator, address *types.Address) (*Contract, error)NewContract creates contract by abi and deployed address
func (contract *Contract) Call(option *types.ContractMethodCallOption, resultPtr interface{}, method string, args ...interface{}) errorCall calls to the contract method with args and fills the excuted result to the "resultPtr".
the resultPtr should be a pointer of the method output struct type.
please refer https://github.com/Conflux-Chain/go-conflux-sdk/blob/master/README.md to get the mappings of solidity types to go types
func (contract *Contract) DecodeEvent(out interface{}, event string, log types.Log) errorDecodeEvent unpacks a retrieved log into the provided output structure.
please refer https://github.com/Conflux-Chain/go-conflux-sdk/blob/master/README.md to get the mappings of solidity types to go types
func (contract *Contract) GetData(method string, args ...interface{}) ([]byte, error)GetData packs the given method name to conform the ABI of the contract. Method call's data will consist of method_id, args0, arg1, ... argN. Method id consists of 4 bytes and arguments are all 32 bytes. Method ids are created from the first 4 bytes of the hash of the methods string signature. (signature = baz(uint32,string32))
please refer https://github.com/Conflux-Chain/go-conflux-sdk/blob/master/README.md to get the mappings of solidity types to go types
func (contract *Contract) SendTransaction(option *types.ContractMethodSendOption, method string, args ...interface{}) (types.Hash, error)SendTransaction sends a transaction to the contract method with args and returns its transaction hash
please refer https://github.com/Conflux-Chain/go-conflux-sdk/blob/master/README.md to get the mappings of solidity types to go types
type ContractDeployResult struct {
//DoneChannel channel for notifying when contract deployed done
DoneChannel <-chan struct{}
TransactionHash *types.Hash
Error error
DeployedContract *Contract
}ContractDeployResult for state change notification when deploying contract
import "."
func CalcBlockConfirmationRisk(rawConfirmationRisk *big.Int) *big.FloatCalcBlockConfirmationRisk calculates block revert rate
func GetMapSortedKeys(m map[string]interface{}) []stringfunc GetObjFileds(obj interface{}) []stringfunc GetObjJsonFieldTags(obj interface{}) []stringfunc Has0xPrefix(input string) boolHas0xPrefix returns true if input starts with '0x' or '0X'
func HexStringToBytes(hexStr string) (hexutil.Bytes, error)HexStringToBytes converts hex string to bytes
func IsNil(i interface{}) boolIsNil sepecialy checks if interface object is nil
func IsRPCJSONError(err error) boolIsRPCJSONError returns true if err is rpc error
func Keccak256(hexStr string) (string, error)Keccak256 hashes hex string by keccak256 and returns it's hash value
func PanicIfErr(err error, msg string)PanicIfErr panic and reports error message
func PanicIfErrf(err error, msg string, args ...interface{})PanicIfErrf panic and reports error message with args
func PrettyJSON(value interface{}) stringPrettyJSON json marshal value and pretty with indent
func PrivateKeyToPublicKey(privateKey string) stringPrivateKeyToPublicKey calculates public key from private key
func PublicKeyToCommonAddress(publicKey string) common.AddressPublicKeyToCommonAddress generate address from public key
Account address in conflux starts with '0x1'
import "."
type AdminControl struct {
sdk.Contract
}AdminControl contract
func NewAdminControl(client sdk.ClientOperator) (ac AdminControl, err error)NewAdminControl gets the AdminControl contract object
func (ac *AdminControl) Destroy(option *types.ContractMethodSendOption, contractAddr types.Address) (types.Hash, error)Destroy destroies contract contractAddr.
func (ac *AdminControl) GetAdmin(option *types.ContractMethodCallOption, contractAddr types.Address) (types.Address, error)GetAdmin returns admin of specific contract
func (ac *AdminControl) SetAdmin(option *types.ContractMethodSendOption, contractAddr types.Address, newAdmin types.Address) (types.Hash, error)SetAdmin sets the administrator of contract contractAddr to newAdmin.
type Sponsor struct {
sdk.Contract
}Sponsor represents SponsorWhitelistControl contract
func NewSponsor(client sdk.ClientOperator) (s Sponsor, err error)NewSponsor gets the SponsorWhitelistControl contract object
func (s *Sponsor) AddPrivilegeByAdmin(option *types.ContractMethodSendOption, contractAddr types.Address, userAddresses []types.Address) (types.Hash, error)AddPrivilegeByAdmin for admin adds user to whitelist
func (s *Sponsor) GetSponsorForCollateral(option *types.ContractMethodCallOption, contractAddr types.Address) (address types.Address, err error)GetSponsorForCollateral gets collateral sponsor address
func (s *Sponsor) GetSponsorForGas(option *types.ContractMethodCallOption, contractAddr types.Address) (address types.Address, err error)GetSponsorForGas gets gas sponsor address of specific contract
func (s *Sponsor) GetSponsoredBalanceForCollateral(option *types.ContractMethodCallOption, contractAddr types.Address) (*big.Int, error)GetSponsoredBalanceForCollateral gets current Sponsored Balance for collateral
func (s *Sponsor) GetSponsoredBalanceForGas(option *types.ContractMethodCallOption, contractAddr types.Address) (*big.Int, error)GetSponsoredBalanceForGas gets current Sponsored Balance for gas
func (s *Sponsor) GetSponsoredGasFeeUpperBound(option *types.ContractMethodCallOption, contractAddr types.Address) (*big.Int, error)GetSponsoredGasFeeUpperBound gets current Sponsored Gas fee upper bound
func (s *Sponsor) IsAllWhitelisted(option *types.ContractMethodCallOption, contractAddr types.Address) (bool, error)IsAllWhitelisted checks if all users are in a contract's whitelist
func (s *Sponsor) IsWhitelisted(option *types.ContractMethodCallOption, contractAddr types.Address, userAddr types.Address) (bool, error)IsWhitelisted checks if a user is in a contract's whitelist
func (s *Sponsor) RemovePrivilegeByAdmin(option *types.ContractMethodSendOption, contractAddr types.Address, userAddresses []types.Address) (types.Hash, error)RemovePrivilegeByAdmin for admin removes user from whitelist
func (s *Sponsor) SetSponsorForCollateral(option *types.ContractMethodSendOption, contractAddr types.Address) (types.Hash, error)SetSponsorForCollateral for someone sponsor the storage collateral for contract
contractAddr, it is payable
func (s *Sponsor) SetSponsorForGas(option *types.ContractMethodSendOption, contractAddr types.Address, upperBound *big.Int) (types.Hash, error)SetSponsorForGas for someone sponsor the gas cost for contract contractAddr
with an upper_bound for a single transaction, it is payable
type Staking struct {
sdk.Contract
}Staking contract
func NewStaking(client sdk.ClientOperator) (s Staking, err error)NewStaking gets the Staking contract object
func (s *Staking) Deposit(option *types.ContractMethodSendOption, amount *big.Int) (types.Hash, error)Deposit amount cfx in this contract
func (ac *Staking) GetLockedStakingBalance(option *types.ContractMethodCallOption, user types.Address, blockNumber *big.Int) (*big.Int, error)GetLockedStakingBalance returns user's locked staking balance at given blockNumber Note: if the blockNumber is less than the current block number, function will return current locked staking balance.
func (ac *Staking) GetStakingBalance(option *types.ContractMethodCallOption, user types.Address) (*big.Int, error)GetStakingBalance returns user's staking balance
func (ac *Staking) GetVotePower(option *types.ContractMethodCallOption, user types.Address, blockNumber *big.Int) (*big.Int, error)GetVotePower returns user's vote power staking balance at given blockNumber
func (s *Staking) VoteLock(option *types.ContractMethodSendOption, amount *big.Int, unlockBlockNumber *big.Int) (types.Hash, error)VoteLock will locks amount cfx from current to next unlockBlockNumber blocks
for obtain vote power
func (s *Staking) Withdraw(option *types.ContractMethodSendOption, amount *big.Int) (types.Hash, error)Withdraw amount cfx from this contract