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core/state: access trie through Database interface, track errors (#14589)

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With this commit, core/state's access to the underlying key/value database is
mediated through an interface. Database errors are tracked in StateDB and
returned by CommitTo or the new Error method.

Motivation for this change: We can remove the light client's duplicated copy of
core/state. The light client now supports node iteration, so tracing and storage
enumeration can work with the light client (not implemented in this commit).
This commit is contained in:
Felix Lange
2017-06-27 15:57:06 +02:00
committed by GitHub
parent bb366271fe
commit 9e5f03b6c4
49 changed files with 810 additions and 1664 deletions
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32
light/txpool.go
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@ -24,6 +24,7 @@ import (
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/event"
@ -100,17 +101,18 @@ func NewTxPool(config *params.ChainConfig, eventMux *event.TypeMux, chain *Light
}
// currentState returns the light state of the current head header
func (pool *TxPool) currentState() *LightState {
return NewLightState(StateTrieID(pool.chain.CurrentHeader()), pool.odr)
func (pool *TxPool) currentState(ctx context.Context) *state.StateDB {
return NewState(ctx, pool.chain.CurrentHeader(), pool.odr)
}
// GetNonce returns the "pending" nonce of a given address. It always queries
// the nonce belonging to the latest header too in order to detect if another
// client using the same key sent a transaction.
func (pool *TxPool) GetNonce(ctx context.Context, addr common.Address) (uint64, error) {
nonce, err := pool.currentState().GetNonce(ctx, addr)
if err != nil {
return 0, err
state := pool.currentState(ctx)
nonce := state.GetNonce(addr)
if state.Error() != nil {
return 0, state.Error()
}
sn, ok := pool.nonce[addr]
if ok && sn > nonce {
@ -357,13 +359,9 @@ func (pool *TxPool) validateTx(ctx context.Context, tx *types.Transaction) error
return core.ErrInvalidSender
}
// Last but not least check for nonce errors
currentState := pool.currentState()
if n, err := currentState.GetNonce(ctx, from); err == nil {
if n > tx.Nonce() {
return core.ErrNonceTooLow
}
} else {
return err
currentState := pool.currentState(ctx)
if n := currentState.GetNonce(from); n > tx.Nonce() {
return core.ErrNonceTooLow
}
// Check the transaction doesn't exceed the current
@ -382,12 +380,8 @@ func (pool *TxPool) validateTx(ctx context.Context, tx *types.Transaction) error
// Transactor should have enough funds to cover the costs
// cost == V + GP * GL
if b, err := currentState.GetBalance(ctx, from); err == nil {
if b.Cmp(tx.Cost()) < 0 {
return core.ErrInsufficientFunds
}
} else {
return err
if b := currentState.GetBalance(from); b.Cmp(tx.Cost()) < 0 {
return core.ErrInsufficientFunds
}
// Should supply enough intrinsic gas
@ -395,7 +389,7 @@ func (pool *TxPool) validateTx(ctx context.Context, tx *types.Transaction) error
return core.ErrIntrinsicGas
}
return nil
return currentState.Error()
}
// add validates a new transaction and sets its state pending if processable.