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Published: Jun 16, 2021 License: GPL-3.0 Imports: 25 Imported by: 0




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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 pecdb.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 fullnode.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()

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 fullnode.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 fullnode.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) 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 fullnode.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. It panics if the transaction is invalid.

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 fullnode.FilterQuery, ch chan<- types.Log) (fullnode.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) (fullnode.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) 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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