backends

package
v0.13.8 Latest Latest
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 Go to latest Published: Aug 6, 2024 License: GPL-3.0, LGPL-3.0 Imports: 27 Imported by: 0

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Variables

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Functions

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Types

type SimulatedBackend 

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

SimulatedBackend implements bind.ContractBackend, simulating a blockchain in the background. Its main purpose is to allow for easy testing of contract bindings. Simulated backend implements the following interfaces: ChainReader, ChainStateReader, ContractBackend, ContractCaller, ContractFilterer, ContractTransactor, DeployBackend, GasEstimator, GasPricer, LogFilterer, AcceptedContractCaller, TransactionReader, and TransactionSender

func NewSimulatedBackend 

func NewSimulatedBackend(alloc core.GenesisAlloc, gasLimit uint64) *SimulatedBackend

NewSimulatedBackend creates a new binding backend using a simulated blockchain for testing purposes. A simulated backend always uses chainID 1337.

func NewSimulatedBackendWithDatabase 

func NewSimulatedBackendWithDatabase(database ethdb.Database, alloc core.GenesisAlloc, gasLimit uint64) *SimulatedBackend

NewSimulatedBackendWithDatabase creates a new binding backend based on the given database and uses a simulated blockchain for testing purposes. A simulated backend always uses chainID 1337.

func (*SimulatedBackend) AcceptedCallContract 

func (b *SimulatedBackend) AcceptedCallContract(ctx context.Context, call interfaces.CallMsg) ([]byte, error)

AcceptedCallContract executes a contract call on the accepted state.

func (*SimulatedBackend) AcceptedCodeAt 

func (b *SimulatedBackend) AcceptedCodeAt(ctx context.Context, contract common.Address) ([]byte, error)

AcceptedCodeAt returns the code associated with an account in the accepted state.

func (*SimulatedBackend) AcceptedNonceAt 

func (b *SimulatedBackend) AcceptedNonceAt(ctx context.Context, account common.Address) (uint64, error)

AcceptedNonceAt implements AcceptedStateReader.AcceptedNonceAt, retrieving the nonce currently accepted for the account.

func (*SimulatedBackend) AdjustTime 

func (b *SimulatedBackend) AdjustTime(adjustment time.Duration) error

AdjustTime adds a time shift to the simulated clock. It can only be called on empty blocks.

func (*SimulatedBackend) BalanceAt 

func (b *SimulatedBackend) BalanceAt(ctx context.Context, contract common.Address, blockNumber *big.Int) (*big.Int, error)

BalanceAt returns the wei balance of a certain account in the blockchain.

func (*SimulatedBackend) BlockByHash 

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

BlockByHash retrieves a block based on the block hash.

func (*SimulatedBackend) BlockByNumber 

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

BlockByNumber retrieves a block from the database by number, caching it (associated with its hash) if found.

func (*SimulatedBackend) Blockchain 

func (b *SimulatedBackend) Blockchain() *core.BlockChain

Blockchain returns the underlying blockchain.

func (*SimulatedBackend) CallContract 

func (b *SimulatedBackend) CallContract(ctx context.Context, call interfaces.CallMsg, blockNumber *big.Int) ([]byte, error)

CallContract executes a contract call.

func (*SimulatedBackend) CallContractAtHash 

func (b *SimulatedBackend) CallContractAtHash(ctx context.Context, call interfaces.CallMsg, blockHash common.Hash) ([]byte, error)

CallContractAtHash executes a contract call on a specific block hash.

func (*SimulatedBackend) Close 

func (b *SimulatedBackend) Close() error

Close terminates the underlying blockchain's update loop.

func (*SimulatedBackend) CodeAt 

func (b *SimulatedBackend) CodeAt(ctx context.Context, contract common.Address, blockNumber *big.Int) ([]byte, error)

CodeAt returns the code associated with a certain account in the blockchain.

func (*SimulatedBackend) CodeAtHash 

func (b *SimulatedBackend) CodeAtHash(ctx context.Context, contract common.Address, blockHash common.Hash) ([]byte, error)

CodeAtHash returns the code associated with a certain account in the blockchain.

func (*SimulatedBackend) Commit 

func (b *SimulatedBackend) Commit(accept bool) common.Hash

Commit imports all the accepted transactions as a single block and starts a fresh new state.

func (*SimulatedBackend) EstimateGas 

func (b *SimulatedBackend) EstimateGas(ctx context.Context, call interfaces.CallMsg) (uint64, error)

EstimateGas executes the requested code against the currently accepted block/state and returns the used amount of gas.

func (*SimulatedBackend) FilterLogs 

func (b *SimulatedBackend) FilterLogs(ctx context.Context, query interfaces.FilterQuery) ([]types.Log, error)

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.

func (*SimulatedBackend) Fork 

func (b *SimulatedBackend) Fork(ctx context.Context, parent common.Hash) error

Fork creates a side-chain that can be used to simulate reorgs.

This function should be called with the ancestor block where the new side chain should be started. Transactions (old and new) can then be applied on top and Commit-ed.

Note, the side-chain will only become canonical (and trigger the events) when it becomes longer. Until then CallContract will still operate on the current canonical chain.

There is a % chance that the side chain becomes canonical at the same length to simulate live network behavior.

func (*SimulatedBackend) HeaderByHash 

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

HeaderByHash returns a block header from the current canonical chain.

func (*SimulatedBackend) HeaderByNumber 

func (b *SimulatedBackend) HeaderByNumber(ctx context.Context, block *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 (*SimulatedBackend) NonceAt 

func (b *SimulatedBackend) NonceAt(ctx context.Context, contract common.Address, blockNumber *big.Int) (uint64, error)

NonceAt returns the nonce of a certain account in the blockchain.

func (*SimulatedBackend) Rollback 

func (b *SimulatedBackend) Rollback()

Rollback aborts all accepted transactions, reverting to the last committed state.

func (*SimulatedBackend) SendTransaction 

func (b *SimulatedBackend) SendTransaction(ctx context.Context, tx *types.Transaction) error

SendTransaction updates the accepted block to include the given transaction.

func (*SimulatedBackend) StorageAt 

func (b *SimulatedBackend) StorageAt(ctx context.Context, contract common.Address, key common.Hash, blockNumber *big.Int) ([]byte, error)

StorageAt returns the value of key in the storage of an account in the blockchain.

func (*SimulatedBackend) SubscribeFilterLogs 

func (b *SimulatedBackend) SubscribeFilterLogs(ctx context.Context, query interfaces.FilterQuery, ch chan<- types.Log) (interfaces.Subscription, error)

SubscribeFilterLogs creates a background log filtering operation, returning a subscription immediately, which can be used to stream the found events.

func (*SimulatedBackend) SubscribeNewHead 

func (b *SimulatedBackend) SubscribeNewHead(ctx context.Context, ch chan<- *types.Header) (interfaces.Subscription, error)

SubscribeNewHead returns an event subscription for a new header.

func (*SimulatedBackend) SuggestGasPrice 

func (b *SimulatedBackend) SuggestGasPrice(ctx context.Context) (*big.Int, error)

SuggestGasPrice implements ContractTransactor.SuggestGasPrice. Since the simulated chain doesn't have miners, we just return a gas price of 1 for any call.

func (*SimulatedBackend) SuggestGasTipCap 

func (b *SimulatedBackend) SuggestGasTipCap(ctx context.Context) (*big.Int, error)

SuggestGasTipCap implements ContractTransactor.SuggestGasTipCap. Since the simulated chain doesn't have miners, we just return a gas tip of 1 for any call.

func (*SimulatedBackend) TransactionByHash 

func (b *SimulatedBackend) TransactionByHash(ctx context.Context, txHash common.Hash) (*types.Transaction, bool, error)

TransactionByHash checks the pool of accepted transactions in addition to the blockchain. The isAccepted return value indicates whether the transaction has been mined yet. Note that the transaction may not be part of the canonical chain even if it's not accepted.

func (*SimulatedBackend) TransactionCount 

func (b *SimulatedBackend) TransactionCount(ctx context.Context, blockHash common.Hash) (uint, error)

TransactionCount returns the number of transactions in a given block.

func (*SimulatedBackend) TransactionInBlock 

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

TransactionInBlock returns the transaction for a specific block at a specific index.

func (*SimulatedBackend) TransactionReceipt 

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

TransactionReceipt returns the receipt of a transaction.

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