103 lines
2.5 KiB
Go
103 lines
2.5 KiB
Go
package pool
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import (
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"context"
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"errors"
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"github.com/anytypeio/any-sync/app/ocache"
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"github.com/anytypeio/any-sync/net/dialer"
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"github.com/anytypeio/any-sync/net/peer"
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"math/rand"
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)
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var (
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ErrUnableToConnect = errors.New("unable to connect")
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)
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// Pool creates and caches outgoing connection
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type Pool interface {
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// Get lookups to peer in existing connections or creates and cache new one
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Get(ctx context.Context, id string) (peer.Peer, error)
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// Dial creates new connection to peer and not use cache
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Dial(ctx context.Context, id string) (peer.Peer, error)
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// GetOneOf searches at least one existing connection in cache or creates a new one from a randomly selected id from given list
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GetOneOf(ctx context.Context, peerIds []string) (peer.Peer, error)
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DialOneOf(ctx context.Context, peerIds []string) (peer.Peer, error)
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}
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type pool struct {
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cache ocache.OCache
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dialer dialer.Dialer
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}
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func (p *pool) Name() (name string) {
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return CName
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}
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func (p *pool) Run(ctx context.Context) (err error) {
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return nil
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}
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func (p *pool) Get(ctx context.Context, id string) (peer.Peer, error) {
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v, err := p.cache.Get(ctx, id)
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if err != nil {
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return nil, err
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}
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pr := v.(peer.Peer)
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select {
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case <-pr.Closed():
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default:
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return pr, nil
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}
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_, _ = p.cache.Remove(ctx, id)
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return p.Get(ctx, id)
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}
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func (p *pool) Dial(ctx context.Context, id string) (peer.Peer, error) {
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return p.dialer.Dial(ctx, id)
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}
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func (p *pool) GetOneOf(ctx context.Context, peerIds []string) (peer.Peer, error) {
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// finding existing connection
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for _, peerId := range peerIds {
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if v, err := p.cache.Pick(ctx, peerId); err == nil {
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pr := v.(peer.Peer)
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select {
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case <-pr.Closed():
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default:
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return pr, nil
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}
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_, _ = p.cache.Remove(ctx, peerId)
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}
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}
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// shuffle ids for better consistency
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rand.Shuffle(len(peerIds), func(i, j int) {
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peerIds[i], peerIds[j] = peerIds[j], peerIds[i]
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})
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// connecting
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for _, peerId := range peerIds {
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if v, err := p.cache.Get(ctx, peerId); err == nil {
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return v.(peer.Peer), nil
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}
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}
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return nil, ErrUnableToConnect
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}
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func (p *pool) DialOneOf(ctx context.Context, peerIds []string) (peer.Peer, error) {
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// shuffle ids for better consistency
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rand.Shuffle(len(peerIds), func(i, j int) {
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peerIds[i], peerIds[j] = peerIds[j], peerIds[i]
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})
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// connecting
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for _, peerId := range peerIds {
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if v, err := p.dialer.Dial(ctx, peerId); err == nil {
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return v.(peer.Peer), nil
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}
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}
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return nil, ErrUnableToConnect
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}
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func (p *pool) Close(ctx context.Context) (err error) {
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return p.cache.Close()
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}
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