Skip to content

accounts/abi/bind/backends: add support for historical state #20644

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 1 commit into from
Feb 12, 2020
Merged

accounts/abi/bind/backends: add support for historical state #20644

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
40 changes: 28 additions & 12 deletions accounts/abi/bind/backends/simulated.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -127,15 +127,28 @@ func (b *SimulatedBackend) rollback() {
b.pendingState, _ = state.New(b.pendingBlock.Root(), statedb.Database())
}

// stateByBlockNumber retrieves a state by a given blocknumber.
func (b *SimulatedBackend) stateByBlockNumber(ctx context.Context, blockNumber *big.Int) (*state.StateDB, error) {
if blockNumber == nil || blockNumber.Cmp(b.blockchain.CurrentBlock().Number()) == 0 {
return b.blockchain.State()
}
block, err := b.BlockByNumber(ctx, blockNumber)
if err != nil {
return nil, err
}
return b.blockchain.StateAt(block.Hash())
}

// CodeAt returns the code associated with a certain account in the blockchain.
func (b *SimulatedBackend) CodeAt(ctx context.Context, contract common.Address, blockNumber *big.Int) ([]byte, error) {
b.mu.Lock()
defer b.mu.Unlock()

if blockNumber != nil && blockNumber.Cmp(b.blockchain.CurrentBlock().Number()) != 0 {
return nil, errBlockNumberUnsupported
statedb, err := b.stateByBlockNumber(ctx, blockNumber)
if err != nil {
return nil, err
}
statedb, _ := b.blockchain.State()

return statedb.GetCode(contract), nil
}

Expand All @@ -144,10 +157,11 @@ func (b *SimulatedBackend) BalanceAt(ctx context.Context, contract common.Addres
b.mu.Lock()
defer b.mu.Unlock()

if blockNumber != nil && blockNumber.Cmp(b.blockchain.CurrentBlock().Number()) != 0 {
return nil, errBlockNumberUnsupported
statedb, err := b.stateByBlockNumber(ctx, blockNumber)
if err != nil {
return nil, err
}
statedb, _ := b.blockchain.State()

return statedb.GetBalance(contract), nil
}

Expand All @@ -156,10 +170,11 @@ func (b *SimulatedBackend) NonceAt(ctx context.Context, contract common.Address,
b.mu.Lock()
defer b.mu.Unlock()

if blockNumber != nil && blockNumber.Cmp(b.blockchain.CurrentBlock().Number()) != 0 {
return 0, errBlockNumberUnsupported
statedb, err := b.stateByBlockNumber(ctx, blockNumber)
if err != nil {
return 0, err
}
statedb, _ := b.blockchain.State()

return statedb.GetNonce(contract), nil
}

Expand All @@ -168,10 +183,11 @@ func (b *SimulatedBackend) StorageAt(ctx context.Context, contract common.Addres
b.mu.Lock()
defer b.mu.Unlock()

if blockNumber != nil && blockNumber.Cmp(b.blockchain.CurrentBlock().Number()) != 0 {
return nil, errBlockNumberUnsupported
statedb, err := b.stateByBlockNumber(ctx, blockNumber)
if err != nil {
return nil, err
}
statedb, _ := b.blockchain.State()

val := statedb.GetState(contract, key)
return val[:], nil
}
Expand Down