transaction

type Backend interface {
	ContractBackend
	TransactionReceipt(ctx context.Context, txHash common.Hash) (receipt *xwctypes.RpcTransactionReceipt, err error)
	TransactionByHash(ctx context.Context, hash common.Hash) (tx *xwctypes.RpcTransaction, isPending bool, err error)
	BlockNumber(ctx context.Context) (uint64, error)
	HeaderByNumber(ctx context.Context, number *big.Int) (*types.Header, error)
	BlockByNumber(ctx context.Context, number *big.Int) (*xwctypes.RpcBlock, error)
	BalanceAt(ctx context.Context, address common.Address, block *big.Int) (*big.Int, error)
	NonceAt(ctx context.Context, account common.Address, blockNumber *big.Int) (uint64, error)

	// for xwc
	IsLocked(ctx context.Context) (bool, error)
	GetAccount(ctx context.Context, acctName string) (xwctypes.RpcAccountJson, error)
	CreateAccount(ctx context.Context, acctName string) (string, error)
	RefBlockInfo(ctx context.Context) (uint16, uint32, error)
	SendXwcTransaction(ctx context.Context, tx *xwcfmt.Transaction) (common.Hash, error)
}

type ContractBackend interface {
	ContractCaller
	ContractTransactor
	ContractFilterer

	ContractXWC
}

type ContractCaller interface {
	// CodeAt returns the code of the given account. This is needed to differentiate
	// between contract internal errors and the local chain being out of sync.
	CodeAt(ctx context.Context, contract common.Address, blockNumber *big.Int) ([]byte, error)
	// ContractCall executes an Ethereum contract call with the specified data as the
	// input.
	CallContract(ctx context.Context, call ethereum.CallMsg, blockNumber *big.Int) ([]byte, error)
}

type ContractFilterer interface {
	// FilterLogs executes a log filter operation, blocking during execution and
	// returning all the results in one batch.
	//
	// TODO(karalabe): Deprecate when the subscription one can return past data too.
	FilterLogs(ctx context.Context, query ethereum.FilterQuery) ([]types.Log, error)

	// SubscribeFilterLogs creates a background log filtering operation, returning
	// a subscription immediately, which can be used to stream the found events.
	SubscribeFilterLogs(ctx context.Context, query ethereum.FilterQuery, ch chan<- types.Log) (ethereum.Subscription, error)
}

type ContractTransactor interface {
	// PendingCodeAt returns the code of the given account in the pending state.
	PendingCodeAt(ctx context.Context, account common.Address) ([]byte, error)
	// PendingNonceAt retrieves the current pending nonce associated with an account.
	PendingNonceAt(ctx context.Context, account common.Address) (uint64, error)
	// SuggestGasPrice retrieves the currently suggested gas price to allow a timely
	// execution of a transaction.
	SuggestGasPrice(ctx context.Context) (*big.Int, 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.
	EstimateGas(ctx context.Context, call ethereum.CallMsg) (gas uint64, err error)
	// SendTransaction injects the transaction into the pending pool for execution.
	SendTransaction(ctx context.Context, tx *types.Transaction) error
}

type ContractXWC interface {
	CodeAt(ctx context.Context, contract common.Address, blockNumber *big.Int) ([]byte, error)
	InvokeContractOffline(ctx context.Context, contract common.Address, api string, arg string) (string, error)
}

type DeployBackend interface {
	TransactionReceipt(ctx context.Context, txHash common.Hash) (*types.Receipt, error)
	CodeAt(ctx context.Context, account common.Address, blockNumber *big.Int) ([]byte, error)
}

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

type Monitor interface {
	io.Closer
	// WatchTransaction watches the transaction until either there is 1 confirmation or a competing transaction with cancellationDepth confirmations.
	WatchTransaction(txHash common.Hash, nonce uint64) (<-chan xwctypes.RpcTransactionReceipt, <-chan error, error)
}

type PendingContractCaller interface {
	// PendingCodeAt returns the code of the given account in the pending state.
	PendingCodeAt(ctx context.Context, contract common.Address) ([]byte, error)
	// PendingCallContract executes an Ethereum contract call against the pending state.
	PendingCallContract(ctx context.Context, call ethereum.CallMsg) ([]byte, error)
}

type Service interface {
	// Send creates a transaction based on the request and sends it.
	Send(ctx context.Context, request *TxRequest) (txHash common.Hash, err error)
	// Call simulate a transaction based on the request.
	Call(ctx context.Context, request *TxRequest) (result []byte, err error)
	// WaitForReceipt waits until either the transaction with the given hash has been mined or the context is cancelled.
	// This is only valid for transaction sent by this service.
	WaitForReceipt(ctx context.Context, txHash common.Hash) (receipt *xwctypes.RpcTransactionReceipt, err error)
	// WatchSentTransaction start watching the given transaction.
	// This wraps the monitors watch function by loading the correct nonce from the store.
	// This is only valid for transaction sent by this service.
	WatchSentTransaction(txHash common.Hash) (<-chan xwctypes.RpcTransactionReceipt, <-chan error, error)
}

type TxRequest struct {
	To       *common.Address // recipient of the transaction
	Data     []byte          // transaction data
	GasPrice *big.Int        // gas price or nil if suggested gas price should be used
	GasLimit uint64          // gas limit or 0 if it should be estimated
	Value    *big.Int        // amount of wei to send

	TxType     int    // 100: transfer   101: transfer to contract   102: invoke contract
	Memo       string // transfer memo
	InvokeApi  string // used for invoking contract
	InvokeArgs string // used for invoking contract
}