keeper

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 Go to latest Published: Aug 20, 2021 License: Apache-2.0 Imports: 33 Imported by: 0

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Functions

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Types

type ContextStack 

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

ContextStack manages the initial context and a stack of cached contexts, to support the `StateDB.Snapshot` and `StateDB.RevertToSnapshot` methods.

func (*ContextStack) Commit 

func (cs *ContextStack) Commit()

Commit commits all the cached contexts from top to bottom in order and clears the stack by setting an empty slice of cache contexts.

func (*ContextStack) CurrentContext 

func (cs *ContextStack) CurrentContext() sdk.Context

CurrentContext returns the top context of cached stack, if the stack is empty, returns the initial context.

func (*ContextStack) IsEmpty 

func (cs *ContextStack) IsEmpty() bool

IsEmpty returns true if the cache context stack is empty.

func (*ContextStack) Reset 

func (cs *ContextStack) Reset(ctx sdk.Context)

Reset sets the initial context and clear the cache context stack.

func (*ContextStack) RevertAll 

func (cs *ContextStack) RevertAll()

RevertAll discards all the cache contexts.

func (*ContextStack) RevertToSnapshot 

func (cs *ContextStack) RevertToSnapshot(target int)

RevertToSnapshot pops all the cached contexts after the target index (inclusive). the target should be snapshot index returned by `Snapshot`. This function panics if the index is out of bounds.

func (*ContextStack) Snapshot 

func (cs *ContextStack) Snapshot() int

Snapshot pushes a new cached context to the stack, and returns the index of it.

type Keeper 

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

Keeper grants access to the EVM module state and implements the go-ethereum StateDB interface.

func NewKeeper 

func NewKeeper(
	cdc codec.BinaryCodec,
	storeKey, transientKey sdk.StoreKey, paramSpace paramtypes.Subspace,
	ak types.AccountKeeper, bankKeeper types.BankKeeper, sk types.StakingKeeper,
	tracer string, debug bool,
) *Keeper

NewKeeper generates new evm module keeper

func (Keeper) Account 

func (k Keeper) Account(c context.Context, req *types.QueryAccountRequest) (*types.QueryAccountResponse, error)

Account implements the Query/Account gRPC method

func (*Keeper) AddAddressToAccessList 

func (k *Keeper) AddAddressToAccessList(addr common.Address)

AddAddressToAccessList adds the given address to the access list. If the address is already in the access list, this function performs a no-op.

func (*Keeper) AddBalance 

func (k *Keeper) AddBalance(addr common.Address, amount *big.Int)

AddBalance adds the given amount to the address balance coin by minting new coins and transferring them to the address. The coin denomination is obtained from the module parameters.

func (*Keeper) AddLog 

func (k *Keeper) AddLog(log *ethtypes.Log)

AddLog appends the given ethereum Log to the list of Logs associated with the transaction hash kept in the current context. This function also fills in the tx hash, block hash, tx index and log index fields before setting the log to store.

func (*Keeper) AddPreimage 

func (k *Keeper) AddPreimage(_ common.Hash, _ []byte)

AddPreimage performs a no-op since the EnablePreimageRecording flag is disabled on the vm.Config during state transitions. No store trie preimages are written to the database.

func (*Keeper) AddRefund 

func (k *Keeper) AddRefund(gas uint64)

AddRefund adds the given amount of gas to the refund transient value.

func (*Keeper) AddSlotToAccessList 

func (k *Keeper) AddSlotToAccessList(addr common.Address, slot common.Hash)

AddSlotToAccessList adds the given (address, slot) to the access list. If the address and slot are already in the access list, this function performs a no-op.

func (*Keeper) AddressInAccessList 

func (k *Keeper) AddressInAccessList(addr common.Address) bool

AddressInAccessList returns true if the address is registered on the transient store.

func (*Keeper) ApplyMessage 

func (k *Keeper) ApplyMessage(evm *vm.EVM, msg core.Message, cfg *params.ChainConfig, query bool) (*types.MsgEthereumTxResponse, error)

ApplyMessage computes the new state by applying the given message against the existing state. If the message fails, the VM execution error with the reason will be returned to the client and the transaction won't be committed to the store.

Reverted state

The transaction is never "reverted" since there is no snapshot + rollback performed on the StateDB. Only successful transactions are written to the store during DeliverTx mode.

Prechecks and Preprocessing

All relevant state transition prechecks for the MsgEthereumTx are performed on the AnteHandler, prior to running the transaction against the state. The prechecks run are the following:

1. the nonce of the message caller is correct 2. caller has enough balance to cover transaction fee(gaslimit * gasprice) 3. the amount of gas required is available in the block 4. the purchased gas is enough to cover intrinsic usage 5. there is no overflow when calculating intrinsic gas 6. caller has enough balance to cover asset transfer for **topmost** call

The preprocessing steps performed by the AnteHandler are:

1. set up the initial access list (iff fork > Berlin)

Query mode

The gRPC query endpoint from 'eth_call' calls this method in query mode, and since the query handler don't call AnteHandler, so we don't do real gas refund in that case.

func (*Keeper) ApplyTransaction 

func (k *Keeper) ApplyTransaction(tx *ethtypes.Transaction) (*types.MsgEthereumTxResponse, error)

ApplyTransaction runs and attempts to perform a state transition with the given transaction (i.e Message), that will only be persisted (committed) to the underlying KVStore if the transaction does not fail.

Gas tracking

Ethereum consumes gas according to the EVM opcodes instead of general reads and writes to store. Because of this, the state transition needs to ignore the SDK gas consumption mechanism defined by the GasKVStore and instead consume the amount of gas used by the VM execution. The amount of gas used is tracked by the EVM and returned in the execution result.

Prior to the execution, the starting tx gas meter is saved and replaced with an infinite gas meter in a new context in order to ignore the SDK gas consumption config values (read, write, has, delete). After the execution, the gas used from the message execution will be added to the starting gas consumed, taking into consideration the amount of gas returned. Finally, the context is updated with the EVM gas consumed value prior to returning.

For relevant discussion see: https://github.com/cosmos/cosmos-sdk/discussions/9072

func (Keeper) Balance 

func (k Keeper) Balance(c context.Context, req *types.QueryBalanceRequest) (*types.QueryBalanceResponse, error)

Balance implements the Query/Balance gRPC method

func (*Keeper) BeginBlock 

func (k *Keeper) BeginBlock(ctx sdk.Context, req abci.RequestBeginBlock)

BeginBlock sets the sdk Context and EIP155 chain id to the Keeper.

func (Keeper) BlockBloom 

func (k Keeper) BlockBloom(c context.Context, req *types.QueryBlockBloomRequest) (*types.QueryBlockBloomResponse, error)

BlockBloom implements the Query/BlockBloom gRPC method

func (Keeper) BlockLogs 

func (k Keeper) BlockLogs(c context.Context, req *types.QueryBlockLogsRequest) (*types.QueryBlockLogsResponse, error)

BlockLogs implements the Query/BlockLogs gRPC method

func (*Keeper) CachedContextsEmpty 

func (k *Keeper) CachedContextsEmpty() bool

CachedContextsEmpty returns true if there's no cache contexts.

func (Keeper) ChainID 

func (k Keeper) ChainID() *big.Int

ChainID returns the EIP155 chain ID for the EVM context

func (Keeper) ClearBalance 

func (k Keeper) ClearBalance(addr sdk.AccAddress) (prevBalance sdk.Coin, err error)

ClearBalance subtracts the EVM all the balance denomination from the address balance while also updating the total supply.

func (Keeper) Code 

func (k Keeper) Code(c context.Context, req *types.QueryCodeRequest) (*types.QueryCodeResponse, error)

Code implements the Query/Code gRPC method

func (*Keeper) CommitCachedContexts 

func (k *Keeper) CommitCachedContexts()

CommitCachedContexts commit all the cache contexts created by `StateDB.Snapshot`.

func (Keeper) CosmosAccount 

func (k Keeper) CosmosAccount(c context.Context, req *types.QueryCosmosAccountRequest) (*types.QueryCosmosAccountResponse, error)

func (*Keeper) CreateAccount 

func (k *Keeper) CreateAccount(addr common.Address)

CreateAccount creates a new EthAccount instance from the provided address and sets the value to store. If an account with the given address already exists, this function also resets any preexisting code and storage associated with that address.

func (Keeper) Ctx 

func (k Keeper) Ctx() sdk.Context

Ctx returns the current context from the context stack

func (Keeper) DeleteAccountStorage 

func (k Keeper) DeleteAccountStorage(addr common.Address)

DeleteAccountStorage clears all the storage state associated with the given address.

func (Keeper) DeleteCode 

func (k Keeper) DeleteCode(addr common.Address)

DeleteCode removes the contract code byte array from the store associated with the given address.

func (Keeper) DeleteState 

func (k Keeper) DeleteState(addr common.Address, key common.Hash)

func (Keeper) DeleteTxLogs 

func (k Keeper) DeleteTxLogs(ctx sdk.Context, txHash common.Hash)

DeleteLogs removes the logs from the KVStore. It is used during journal.Revert.

func (*Keeper) Empty 

func (k *Keeper) Empty(addr common.Address) bool

Empty returns true if the address meets the following conditions:

  • nonce is 0
  • balance amount for evm denom is 0
  • account code hash is empty

Non-ethereum accounts are considered not empty

func (*Keeper) EndBlock 

func (k *Keeper) EndBlock(ctx sdk.Context, req abci.RequestEndBlock) []abci.ValidatorUpdate

EndBlock also retrieves the bloom filter value from the transient store and commits it to the KVStore. The EVM end block logic doesn't update the validator set, thus it returns an empty slice.

func (Keeper) EstimateGas 

func (k Keeper) EstimateGas(c context.Context, req *types.EthCallRequest) (*types.EstimateGasResponse, error)

EstimateGas implements eth_estimateGas rpc api.

func (Keeper) EthCall 

func (k Keeper) EthCall(c context.Context, req *types.EthCallRequest) (*types.MsgEthereumTxResponse, error)

EthCall implements eth_call rpc api.

func (*Keeper) EthereumTx 

func (k *Keeper) EthereumTx(goCtx context.Context, msg *types.MsgEthereumTx) (*types.MsgEthereumTxResponse, error)

EthereumTx implements the gRPC MsgServer interface. It receives a transaction which is then executed (i.e applied) against the go-ethereum EVM. The provided SDK Context is set to the Keeper so that it can implements and call the StateDB methods without receiving it as a function parameter.

func (*Keeper) Exist 

func (k *Keeper) Exist(addr common.Address) bool

Exist returns true if the given account exists in store or if it has been marked as suicided in the transient store.

func (*Keeper) ForEachStorage 

func (k *Keeper) ForEachStorage(addr common.Address, cb func(key, value common.Hash) bool) error

ForEachStorage uses the store iterator to iterate over all the state keys and perform a callback function on each of them.

func (*Keeper) GasToRefund 

func (k *Keeper) GasToRefund(gasConsumed uint64) uint64

GasToRefund calculates the amount of gas the state machine should refund to the sender. It is capped by half of the gas consumed.

func (Keeper) GetAccountStorage 

func (k Keeper) GetAccountStorage(ctx sdk.Context, address common.Address) (types.Storage, error)

GetAccountStorage return state storage associated with an account

func (Keeper) GetAllTxLogs 

func (k Keeper) GetAllTxLogs(ctx sdk.Context) []types.TransactionLogs

GetAllTxLogs return all the transaction logs from the store.

func (*Keeper) GetBalance 

func (k *Keeper) GetBalance(addr common.Address) *big.Int

GetBalance returns the EVM denomination balance of the provided address. The denomination is obtained from the module parameters.

func (Keeper) GetBlockBloom 

func (k Keeper) GetBlockBloom(ctx sdk.Context, height int64) (ethtypes.Bloom, bool)

GetBlockBloom gets bloombits from block height

func (Keeper) GetBlockBloomTransient 

func (k Keeper) GetBlockBloomTransient() *big.Int

GetBlockBloomTransient returns bloom bytes for the current block height

func (*Keeper) GetCode 

func (k *Keeper) GetCode(addr common.Address) []byte

GetCode returns the code byte array associated with the given address. If the code hash from the account is empty, this function returns nil.

func (*Keeper) GetCodeHash 

func (k *Keeper) GetCodeHash(addr common.Address) common.Hash

GetCodeHash fetches the account from the store and returns its code hash. If the account doesn't exist or is not an EthAccount type, GetCodeHash returns the empty code hash value.

func (*Keeper) GetCodeSize 

func (k *Keeper) GetCodeSize(addr common.Address) int

GetCodeSize returns the size of the contract code associated with this object, or zero if none.

func (Keeper) GetCoinbaseAddress 

func (k Keeper) GetCoinbaseAddress() (common.Address, error)

GetCoinbaseAddress returns the block proposer's validator operator address.

func (*Keeper) GetCommittedState 

func (k *Keeper) GetCommittedState(addr common.Address, hash common.Hash) common.Hash

GetCommittedState returns the value set in store for the given key hash. If the key is not registered this function returns the empty hash.

func (*Keeper) GetEthIntrinsicGas 

func (k *Keeper) GetEthIntrinsicGas(msg core.Message, cfg *params.ChainConfig, isContractCreation bool) (uint64, error)

GetEthIntrinsicGas returns the intrinsic gas cost for the transaction

func (Keeper) GetHashFn 

func (k Keeper) GetHashFn() vm.GetHashFunc

GetHashFn implements vm.GetHashFunc for Ethermint. It handles 3 cases:

  1. The requested height matches the current height from context (and thus same epoch number)
  2. The requested height is from an previous height from the same chain epoch
  3. The requested height is from a height greater than the latest one

func (Keeper) GetLogSizeTransient 

func (k Keeper) GetLogSizeTransient() uint64

GetLogSizeTransient returns EVM log index on the current block.

func (*Keeper) GetNonce 

func (k *Keeper) GetNonce(addr common.Address) uint64

GetNonce retrieves the account with the given address and returns the tx sequence (i.e nonce). The function performs a no-op if the account is not found.

func (Keeper) GetParams 

func (k Keeper) GetParams(ctx sdk.Context) (params types.Params)

GetParams returns the total set of evm parameters.

func (*Keeper) GetRefund 

func (k *Keeper) GetRefund() uint64

GetRefund returns the amount of gas available for return after the tx execution finalizes. This value is reset to 0 on every transaction.

func (*Keeper) GetState 

func (k *Keeper) GetState(addr common.Address, hash common.Hash) common.Hash

GetState returns the committed state for the given key hash, as all changes are committed directly to the KVStore.

func (Keeper) GetTxHashTransient 

func (k Keeper) GetTxHashTransient() common.Hash

GetTxHashTransient returns the hash of current processing transaction

func (Keeper) GetTxIndexTransient 

func (k Keeper) GetTxIndexTransient() uint64

GetTxIndexTransient returns EVM transaction index on the current block.

func (Keeper) GetTxLogs 

func (k Keeper) GetTxLogs(txHash common.Hash) []*ethtypes.Log

GetLogs returns the current logs for a given transaction hash from the KVStore. This function returns an empty, non-nil slice if no logs are found.

func (*Keeper) HasSuicided 

func (k *Keeper) HasSuicided(addr common.Address) bool

HasSuicided queries the transient store to check if the account has been marked as suicided in the current block. Accounts that are suicided will be returned as non-nil during queries and "cleared" after the block has been committed.

func (Keeper) IncreaseLogSizeTransient 

func (k Keeper) IncreaseLogSizeTransient()

IncreaseLogSizeTransient fetches the current EVM log index from the transient store, increases its value by one and then sets the new index back to the transient store.

func (Keeper) IncreaseTxIndexTransient 

func (k Keeper) IncreaseTxIndexTransient()

IncreaseTxIndexTransient fetches the current EVM tx index from the transient store, increases its value by one and then sets the new index back to the transient store.

func (Keeper) Logger 

func (k Keeper) Logger(ctx sdk.Context) log.Logger

Logger returns a module-specific logger.

func (*Keeper) NewEVM 

func (k *Keeper) NewEVM(
	msg core.Message,
	config *params.ChainConfig,
	params types.Params,
	coinbase common.Address,
	tracer vm.Tracer,
) *vm.EVM

NewEVM generates a go-ethereum VM from the provided Message fields and the chain parameters (ChainConfig and module Params). It additionally sets the validator operator address as the coinbase address to make it available for the COINBASE opcode, even though there is no beneficiary of the coinbase transaction (since we're not mining).

func (Keeper) Params 

func (k Keeper) Params(c context.Context, _ *types.QueryParamsRequest) (*types.QueryParamsResponse, error)

Params implements the Query/Params gRPC method

func (*Keeper) PrepareAccessList 

func (k *Keeper) PrepareAccessList(sender common.Address, dest *common.Address, precompiles []common.Address, txAccesses ethtypes.AccessList)

PrepareAccessList handles the preparatory steps for executing a state transition with regards to both EIP-2929 and EIP-2930:

  • Add sender to access list (2929)
  • Add destination to access list (2929)
  • Add precompiles to access list (2929)
  • Add the contents of the optional tx access list (2930)

This method should only be called if Yolov3/Berlin/2929+2930 is applicable at the current number.

func (*Keeper) RefundGas 

func (k *Keeper) RefundGas(msg core.Message, leftoverGas uint64) (uint64, error)

RefundGas transfers the leftover gas to the sender of the message, caped to half of the total gas consumed in the transaction. Additionally, the function sets the total gas consumed to the value returned by the EVM execution, thus ignoring the previous intrinsic gas consumed during in the AnteHandler.

func (Keeper) ResetAccount 

func (k Keeper) ResetAccount(addr common.Address)

ResetAccount removes the code, storage state, but keep all the native tokens stored with the given address.

func (Keeper) ResetRefundTransient 

func (k Keeper) ResetRefundTransient(ctx sdk.Context)

ResetRefundTransient resets the available refund amount to 0

func (*Keeper) RevertToSnapshot 

func (k *Keeper) RevertToSnapshot(target int)

RevertToSnapshot pop all the cached contexts after(including) the snapshot

func (Keeper) SetBlockBloom 

func (k Keeper) SetBlockBloom(ctx sdk.Context, height int64, bloom ethtypes.Bloom)

SetBlockBloom sets the mapping from block height to bloom bits

func (Keeper) SetBlockBloomTransient 

func (k Keeper) SetBlockBloomTransient(bloom *big.Int)

SetBlockBloomTransient sets the given bloom bytes to the transient store. This value is reset on every block.

func (*Keeper) SetCode 

func (k *Keeper) SetCode(addr common.Address, code []byte)

SetCode stores the code byte array to the application KVStore and sets the code hash to the given account. The code is deleted from the store if it is empty.

func (Keeper) SetLogs 

func (k Keeper) SetLogs(txHash common.Hash, logs []*ethtypes.Log)

SetLogs sets the logs for a transaction in the KVStore.

func (*Keeper) SetNonce 

func (k *Keeper) SetNonce(addr common.Address, nonce uint64)

SetNonce sets the given nonce as the sequence of the address' account. If the account doesn't exist, a new one will be created from the address.

func (Keeper) SetParams 

func (k Keeper) SetParams(ctx sdk.Context, params types.Params)

SetParams sets the evm parameters to the param space.

func (*Keeper) SetState 

func (k *Keeper) SetState(addr common.Address, key, value common.Hash)

SetState sets the given hashes (key, value) to the KVStore. If the value hash is empty, this function deletes the key from the store.

func (Keeper) SetTxHashTransient 

func (k Keeper) SetTxHashTransient(hash common.Hash)

SetTxHashTransient set the hash of processing transaction

func (*Keeper) SlotInAccessList 

func (k *Keeper) SlotInAccessList(addr common.Address, slot common.Hash) (addressOk bool, slotOk bool)

SlotInAccessList checks if the address and the slots are registered in the transient store

func (*Keeper) Snapshot 

func (k *Keeper) Snapshot() int

Snapshot return the index in the cached context stack

func (Keeper) StaticCall 

func (k Keeper) StaticCall(c context.Context, req *types.QueryStaticCallRequest) (*types.QueryStaticCallResponse, error)

StaticCall implements Query/StaticCall gRPCP method

func (Keeper) Storage 

func (k Keeper) Storage(c context.Context, req *types.QueryStorageRequest) (*types.QueryStorageResponse, error)

Storage implements the Query/Storage gRPC method

func (*Keeper) SubBalance 

func (k *Keeper) SubBalance(addr common.Address, amount *big.Int)

SubBalance subtracts the given amount from the address balance by transferring the coins to an escrow account and then burning them. The coin denomination is obtained from the module parameters. This function performs a no-op if the amount is negative or the user doesn't have enough funds for the transfer.

func (*Keeper) SubRefund 

func (k *Keeper) SubRefund(gas uint64)

SubRefund subtracts the given amount of gas from the transient refund value. This function will panic if gas amount is greater than the stored refund.

func (*Keeper) Suicide 

func (k *Keeper) Suicide(addr common.Address) bool

Suicide marks the given account as suicided and clears the account balance of the EVM tokens.

func (Keeper) TxLogs 

func (k Keeper) TxLogs(c context.Context, req *types.QueryTxLogsRequest) (*types.QueryTxLogsResponse, error)

TxLogs implements the Query/TxLogs gRPC method

func (Keeper) VMConfig 

func (k Keeper) VMConfig(msg core.Message, params types.Params, tracer vm.Tracer) vm.Config

VMConfig creates an EVM configuration from the debug setting and the extra EIPs enabled on the module parameters. The config generated uses the default JumpTable from the EVM.

func (Keeper) ValidatorAccount 

func (k Keeper) ValidatorAccount(c context.Context, req *types.QueryValidatorAccountRequest) (*types.QueryValidatorAccountResponse, error)

func (*Keeper) WithChainID 

func (k *Keeper) WithChainID(ctx sdk.Context)

WithChainID sets the chain id to the local variable in the keeper

func (*Keeper) WithContext 

func (k *Keeper) WithContext(ctx sdk.Context)

WithContext clears the context stack, and set the initial context.

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