76 lines
1.7 KiB
Go
76 lines
1.7 KiB
Go
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package history
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import (
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"context"
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/event"
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"github.com/ethereum/go-ethereum/log"
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"github.com/status-im/status-go/services/wallet/async"
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"github.com/status-im/status-go/services/wallet/transfer"
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"github.com/status-im/status-go/services/wallet/walletevent"
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)
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type TransfersLoadedCb func(chainID uint64, addresses []common.Address, block *big.Int)
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// Watcher executes a given callback whenever an account gets added/removed
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type Watcher struct {
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feed *event.Feed
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group *async.Group
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callback TransfersLoadedCb
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}
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func NewWatcher(feed *event.Feed, callback TransfersLoadedCb) *Watcher {
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return &Watcher{
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feed: feed,
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callback: callback,
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}
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}
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func (w *Watcher) Start() {
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if w.group != nil {
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return
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}
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w.group = async.NewGroup(context.Background())
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w.group.Add(func(ctx context.Context) error {
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return watch(ctx, w.feed, w.callback)
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})
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}
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func (w *Watcher) Stop() {
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if w.group != nil {
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w.group.Stop()
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w.group.Wait()
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w.group = nil
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}
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}
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func onTransfersLoaded(callback TransfersLoadedCb, chainID uint64, addresses []common.Address, blockNum *big.Int) {
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if callback != nil {
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callback(chainID, addresses, blockNum)
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}
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}
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func watch(ctx context.Context, feed *event.Feed, callback TransfersLoadedCb) error {
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ch := make(chan walletevent.Event, 100)
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sub := feed.Subscribe(ch)
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defer sub.Unsubscribe()
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for {
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select {
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case <-ctx.Done():
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return nil
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case err := <-sub.Err():
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if err != nil {
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log.Error("history: transfers watcher subscription failed", "error", err)
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}
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case ev := <-ch:
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if ev.Type == transfer.EventNewTransfers {
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onTransfersLoaded(callback, ev.ChainID, ev.Accounts, ev.BlockNumber)
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}
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}
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}
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}
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