status-go/services/wallet/transfer/sequential_fetch_strategy.go

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package transfer
import (
"context"
"math/big"
"sync"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/log"
"github.com/status-im/status-go/rpc/chain"
"github.com/status-im/status-go/services/wallet/async"
"github.com/status-im/status-go/services/wallet/walletevent"
)
func NewSequentialFetchStrategy(db *Database, blockDAO *BlockDAO, feed *event.Feed,
transactionManager *TransactionManager,
chainClients map[uint64]*chain.ClientWithFallback,
accounts []common.Address) *SequentialFetchStrategy {
return &SequentialFetchStrategy{
db: db,
blockDAO: blockDAO,
feed: feed,
transactionManager: transactionManager,
chainClients: chainClients,
accounts: accounts,
}
}
type SequentialFetchStrategy struct {
db *Database
blockDAO *BlockDAO
feed *event.Feed
mu sync.Mutex
group *async.Group
transactionManager *TransactionManager
chainClients map[uint64]*chain.ClientWithFallback
accounts []common.Address
}
func (s *SequentialFetchStrategy) newCommand(chainClient *chain.ClientWithFallback,
accounts []common.Address) async.Commander {
return newLoadBlocksAndTransfersCommand(accounts, s.db, s.blockDAO, chainClient, s.feed,
s.transactionManager)
}
func (s *SequentialFetchStrategy) start() error {
s.mu.Lock()
defer s.mu.Unlock()
if s.group != nil {
return errAlreadyRunning
}
s.group = async.NewGroup(context.Background())
if s.feed != nil {
s.feed.Send(walletevent.Event{
Type: EventFetchingRecentHistory,
Accounts: s.accounts,
})
}
for _, chainClient := range s.chainClients {
ctl := s.newCommand(chainClient, s.accounts)
s.group.Add(ctl.Command())
}
return nil
}
// Stop stops reactor loop and waits till it exits.
func (s *SequentialFetchStrategy) stop() {
s.mu.Lock()
defer s.mu.Unlock()
if s.group == nil {
return
}
s.group.Stop()
s.group.Wait()
s.group = nil
}
func (s *SequentialFetchStrategy) kind() FetchStrategyType {
return SequentialFetchStrategyType
}
// TODO: remove fetchMore parameter from here and interface, it is used by OnDemandFetchStrategy only
func (s *SequentialFetchStrategy) getTransfersByAddress(ctx context.Context, chainID uint64, address common.Address, toBlock *big.Int,
limit int64, fetchMore bool) ([]Transfer, error) {
log.Info("[WalletAPI:: GetTransfersByAddress] get transfers for an address", "address", address, "fetchMore", fetchMore,
"chainID", chainID, "toBlock", toBlock, "limit", limit)
rst, err := s.db.GetTransfersByAddress(chainID, address, toBlock, limit)
if err != nil {
log.Error("[WalletAPI:: GetTransfersByAddress] can't fetch transfers", "err", err)
return nil, err
}
return rst, nil
}