86 lines
2.2 KiB
Go
86 lines
2.2 KiB
Go
package accountsevent
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import (
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"context"
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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/multiaccounts/accounts"
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"github.com/status-im/status-go/services/wallet/async"
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)
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type AccountsChangeCb func(changedAddresses []common.Address, eventType EventType, currentAddresses []common.Address)
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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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accountsDB *accounts.Database
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accountFeed *event.Feed
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group *async.Group
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callback AccountsChangeCb
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}
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func NewWatcher(accountsDB *accounts.Database, accountFeed *event.Feed, callback AccountsChangeCb) *Watcher {
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return &Watcher{
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accountsDB: accountsDB,
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accountFeed: accountFeed,
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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.accountsDB, w.accountFeed, 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 onAccountsChange(accountsDB *accounts.Database, callback AccountsChangeCb, changedAddresses []common.Address, eventType EventType) {
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currentEthAddresses, err := accountsDB.GetWalletAddresses()
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if err != nil {
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log.Error("failed getting wallet addresses", "error", err)
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return
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}
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currentAddresses := make([]common.Address, 0, len(currentEthAddresses))
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for _, ethAddress := range currentEthAddresses {
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currentAddresses = append(currentAddresses, common.Address(ethAddress))
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}
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if callback != nil {
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callback(changedAddresses, eventType, currentAddresses)
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}
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}
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func watch(ctx context.Context, accountsDB *accounts.Database, accountFeed *event.Feed, callback AccountsChangeCb) error {
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ch := make(chan Event, 1)
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sub := accountFeed.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("accounts watcher subscription failed", "error", err)
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}
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case ev := <-ch:
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onAccountsChange(accountsDB, callback, ev.Accounts, ev.Type)
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}
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}
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}
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