backends

package
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 Go to latest Published: Mar 7, 2023 License: GPL-3.0 Imports: 25 Imported by: 0

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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, PendingContractCaller, 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) 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 ethereum.CallMsg, blockNumber *big.Int) ([]byte, error)

CallContract executes a contract call.

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) Commit 

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

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

func (*SimulatedBackend) EstimateGas 

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

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

func (*SimulatedBackend) FilterLogs 

func (b *SimulatedBackend) FilterLogs(ctx context.Context, query ethereum.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) PendingCallContract 

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

PendingCallContract executes a contract call on the pending state.

func (*SimulatedBackend) PendingCodeAt 

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

PendingCodeAt returns the code associated with an account in the pending state.

func (*SimulatedBackend) PendingNonceAt 

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

PendingNonceAt implements PendingStateReader.PendingNonceAt, retrieving the nonce currently pending for the account.

func (*SimulatedBackend) Rollback 

func (b *SimulatedBackend) Rollback()

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

func (*SimulatedBackend) SendTransaction 

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

SendTransaction updates the pending 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 ethereum.FilterQuery, ch chan<- types.Log) (ethereum.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) (ethereum.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 pending transactions in addition to the blockchain. The isPending 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 pending.

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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