status-go/services/shhext/mailservers/utils.go

53 lines
1.3 KiB
Go

package mailservers
import (
"sort"
"github.com/ethereum/go-ethereum/p2p/enode"
)
// GetFirstConnected returns first connected peer that is also added to a peer store.
// Raises ErrNoConnected if no peers are added to a peer store.
func GetFirstConnected(provider PeersProvider, store *PeerStore) (*enode.Node, error) {
peers := provider.Peers()
for _, p := range peers {
if store.Exist(p.ID()) {
return p.Node(), nil
}
}
return nil, ErrNoConnected
}
// NodesNotifee interface to be notified when new nodes are received.
type NodesNotifee interface {
Notify([]*enode.Node)
}
// EnsureUsedRecordsAddedFirst checks if any nodes were marked as connected before app went offline.
func EnsureUsedRecordsAddedFirst(ps *PeerStore, conn NodesNotifee) error {
records, err := ps.cache.LoadAll()
if err != nil {
return err
}
if len(records) == 0 {
return nil
}
sort.Slice(records, func(i, j int) bool {
return records[i].LastUsed.After(records[j].LastUsed)
})
all := recordsToNodes(records)
if !records[0].LastUsed.IsZero() {
conn.Notify(all[:1])
}
conn.Notify(all)
return nil
}
func recordsToNodes(records []PeerRecord) []*enode.Node {
nodes := make([]*enode.Node, len(records))
for i := range records {
nodes[i] = records[i].Node()
}
return nodes
}