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f2c6fef64c
This change allows to connect to the mail server that we were using before the app was restarted. Separate loop is listening for whisper events, and when we receive event that request was completed we will update time on a peer record. Records are stored in leveldb. Body of the record is marshaled using json. At this point the only field is a timestamp when record was used. This loop doesn't control connections, it only tracks what mail server we ended up using. It works asynchronously to connection management loop. Which tracks events that are related to connection state and expiry of the requests. When app starts we look into the database and select the most recently used record. This record is added to connection management loop first. So if this server is available we will stick to using it. If we weren't able to connect to the same server in configured timeout (5s) we will try to connect to any other server from list of active servers. closes: #1285
53 lines
1.3 KiB
Go
53 lines
1.3 KiB
Go
package mailservers
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import (
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"sort"
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"github.com/ethereum/go-ethereum/p2p/enode"
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)
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// GetFirstConnected returns first connected peer that is also added to a peer store.
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// Raises ErrNoConnected if no peers are added to a peer store.
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func GetFirstConnected(provider PeersProvider, store *PeerStore) (*enode.Node, error) {
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peers := provider.Peers()
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for _, p := range peers {
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if store.Exist(p.ID()) {
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return p.Node(), nil
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}
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}
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return nil, ErrNoConnected
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}
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// NodesNotifee interface to be notified when new nodes are received.
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type NodesNotifee interface {
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Notify([]*enode.Node)
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}
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// EnsureUsedRecordsAddedFirst checks if any nodes were marked as connected before app went offline.
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func EnsureUsedRecordsAddedFirst(ps *PeerStore, conn NodesNotifee) error {
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records, err := ps.cache.LoadAll()
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if err != nil {
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return err
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}
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if len(records) == 0 {
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return nil
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}
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sort.Slice(records, func(i, j int) bool {
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return records[i].LastUsed.After(records[j].LastUsed)
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})
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all := recordsToNodes(records)
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if !records[0].LastUsed.IsZero() {
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conn.Notify(all[:1])
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}
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conn.Notify(all)
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return nil
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}
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func recordsToNodes(records []PeerRecord) []*enode.Node {
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nodes := make([]*enode.Node, len(records))
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for i := range records {
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nodes[i] = records[i].Node()
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}
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return nodes
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}
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