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balance_cache.go
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balance_cache.go
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package transfer
import (
"context"
"math/big"
"sort"
"sync"
"github.com/ethereum/go-ethereum/common"
)
type nonceRange struct {
nonce int64
max *big.Int
min *big.Int
}
type balanceCache struct {
// balances maps an address to a map of a block number and the balance of this particular address
balances map[common.Address]map[*big.Int]*big.Int
nonces map[common.Address]map[*big.Int]*int64
nonceRanges map[common.Address]map[int64]nonceRange
sortedRanges map[common.Address][]nonceRange
rw sync.RWMutex
}
type BalanceCache interface {
BalanceAt(ctx context.Context, client BalanceReader, account common.Address, blockNumber *big.Int) (*big.Int, error)
NonceAt(ctx context.Context, client BalanceReader, account common.Address, blockNumber *big.Int) (*int64, error)
}
func (b *balanceCache) ReadCachedBalance(account common.Address, blockNumber *big.Int) *big.Int {
b.rw.RLock()
defer b.rw.RUnlock()
return b.balances[account][blockNumber]
}
func (b *balanceCache) addBalanceToCache(account common.Address, blockNumber *big.Int, balance *big.Int) {
b.rw.Lock()
defer b.rw.Unlock()
_, exists := b.balances[account]
if !exists {
b.balances[account] = make(map[*big.Int]*big.Int)
}
b.balances[account][blockNumber] = balance
}
func (b *balanceCache) BalanceAt(ctx context.Context, client BalanceReader, account common.Address, blockNumber *big.Int) (*big.Int, error) {
cachedBalance := b.ReadCachedBalance(account, blockNumber)
if cachedBalance != nil {
return cachedBalance, nil
}
balance, err := client.BalanceAt(ctx, account, blockNumber)
if err != nil {
return nil, err
}
b.addBalanceToCache(account, blockNumber, balance)
return balance, nil
}
func (b *balanceCache) ReadCachedNonce(account common.Address, blockNumber *big.Int) *int64 {
b.rw.RLock()
defer b.rw.RUnlock()
return b.nonces[account][blockNumber]
}
func (b *balanceCache) sortRanges(account common.Address) {
keys := make([]int, 0, len(b.nonceRanges[account]))
for k := range b.nonceRanges[account] {
keys = append(keys, int(k))
}
sort.Ints(keys)
ranges := []nonceRange{}
for _, k := range keys {
r := b.nonceRanges[account][int64(k)]
ranges = append(ranges, r)
}
b.sortedRanges[account] = ranges
}
func (b *balanceCache) findNonceInRange(account common.Address, block *big.Int) *int64 {
for k := range b.sortedRanges[account] {
nr := b.sortedRanges[account][k]
cmpMin := nr.min.Cmp(block)
if cmpMin == 1 {
return nil
} else if cmpMin == 0 {
return &nr.nonce
} else {
cmpMax := nr.max.Cmp(block)
if cmpMax >= 0 {
return &nr.nonce
}
}
}
return nil
}
func (b *balanceCache) updateNonceRange(account common.Address, blockNumber *big.Int, nonce *int64) {
_, exists := b.nonceRanges[account]
if !exists {
b.nonceRanges[account] = make(map[int64]nonceRange)
}
nr, exists := b.nonceRanges[account][*nonce]
if !exists {
r := nonceRange{
max: big.NewInt(0).Set(blockNumber),
min: big.NewInt(0).Set(blockNumber),
nonce: *nonce,
}
b.nonceRanges[account][*nonce] = r
} else {
if nr.max.Cmp(blockNumber) == -1 {
nr.max.Set(blockNumber)
}
if nr.min.Cmp(blockNumber) == 1 {
nr.min.Set(blockNumber)
}
b.nonceRanges[account][*nonce] = nr
b.sortRanges(account)
}
}
func (b *balanceCache) addNonceToCache(account common.Address, blockNumber *big.Int, nonce *int64) {
b.rw.Lock()
defer b.rw.Unlock()
_, exists := b.nonces[account]
if !exists {
b.nonces[account] = make(map[*big.Int]*int64)
}
b.nonces[account][blockNumber] = nonce
b.updateNonceRange(account, blockNumber, nonce)
}
func (b *balanceCache) NonceAt(ctx context.Context, client BalanceReader, account common.Address, blockNumber *big.Int) (*int64, error) {
cachedNonce := b.ReadCachedNonce(account, blockNumber)
if cachedNonce != nil {
return cachedNonce, nil
}
rangeNonce := b.findNonceInRange(account, blockNumber)
if rangeNonce != nil {
return rangeNonce, nil
}
nonce, err := client.NonceAt(ctx, account, blockNumber)
if err != nil {
return nil, err
}
int64Nonce := int64(nonce)
b.addNonceToCache(account, blockNumber, &int64Nonce)
return &int64Nonce, nil
}
func newBalanceCache() *balanceCache {
return &balanceCache{
balances: make(map[common.Address]map[*big.Int]*big.Int),
nonces: make(map[common.Address]map[*big.Int]*int64),
nonceRanges: make(map[common.Address]map[int64]nonceRange),
sortedRanges: make(map[common.Address][]nonceRange),
}
}