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driver_mock.go
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driver_mock.go
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package tinder
import (
"context"
"fmt"
"sync"
"time"
"github.com/libp2p/go-libp2p/core/discovery"
"github.com/libp2p/go-libp2p/core/host"
"github.com/libp2p/go-libp2p/core/peer"
)
type MockDriverServer struct {
pc *peersCache
topics map[string] /* topic */ map[peer.ID]time.Time
mx sync.RWMutex
}
func NewMockDriverServer() *MockDriverServer {
return &MockDriverServer{
topics: make(map[string]map[peer.ID]time.Time),
pc: newPeerCache(),
}
}
func (s *MockDriverServer) Advertise(topic string, info peer.AddrInfo, ttl time.Duration) {
s.mx.Lock()
expires, ok := s.topics[topic]
if !ok {
expires = map[peer.ID]time.Time{}
s.topics[topic] = expires
}
expires[info.ID] = time.Now().Add(ttl)
s.mx.Unlock()
s.pc.UpdatePeer(topic, info)
}
func (s *MockDriverServer) FindPeers(topic string, limit int) <-chan peer.AddrInfo {
s.mx.Lock()
defer s.mx.Unlock()
peers := s.pc.GetPeersForTopics(topic)
if len(peers) < limit {
limit = len(peers)
}
expires, ok := s.topics[topic]
if !ok {
expires = map[peer.ID]time.Time{}
s.topics[topic] = expires
}
out := make(chan peer.AddrInfo, limit)
for i := 0; i < limit; i++ {
peer := peers[i]
if expire, ok := expires[peer.ID]; ok {
if time.Now().Before(expire) {
out <- peer
} else {
delete(expires, peer.ID)
}
}
}
close(out)
return out
}
func (s *MockDriverServer) Unregister(ctx context.Context, topic string, p peer.ID) {
s.mx.Lock()
s.pc.RemoveFromCache(ctx, topic, p)
if expires, ok := s.topics[topic]; ok {
delete(expires, p)
}
s.mx.Unlock()
}
func (s *MockDriverServer) Exist(topic string, p peer.ID) (ok bool) {
peers := s.pc.GetPeersForTopics(topic)
return len(peers) == 1
}
func (s *MockDriverServer) Subscribe(ctx context.Context, topic string, buffsize int) <-chan peer.AddrInfo {
s.mx.Lock()
defer s.mx.Unlock()
start := time.Now()
peers := s.pc.GetPeersForTopics(topic)
knownPeers := make(PeersUpdate)
for _, p := range peers {
knownPeers[p.ID] = start
}
out := make(chan peer.AddrInfo, buffsize)
go func() {
for {
// Wait until `PeersCache` differ from `peerCache` peers status
updated, ok := s.pc.WaitForPeerUpdate(ctx, topic, knownPeers)
if !ok {
break // context has expired
}
// send peers
for _, peer := range s.pc.GetPeers(updated...) {
out <- peer
}
}
// we're done here, close the channel and decrement
close(out)
}()
return out
}
func (s *MockDriverServer) WaitForPeer(topic string, p peer.ID, timeout time.Duration) (err error) {
ctx, cancel := context.WithTimeout(context.Background(), timeout)
defer cancel()
knownPeers := make(PeersUpdate)
for {
// Wait until `PeersCache` differ from `peerCache` peers status
updated, expired := s.pc.WaitForPeerUpdate(ctx, topic, knownPeers)
if !expired {
return fmt.Errorf("timeout while waiting for: %s", p.String())
}
// send peers
for _, upeer := range updated {
if upeer == p {
return nil
}
}
}
}
func (s *MockDriverServer) Client(h host.Host) IDriver {
return &MockIDriverClient{h: h, serv: s}
}
var _ IDriver = (*MockIDriverClient)(nil)
type MockIDriverClient struct {
h host.Host
serv *MockDriverServer
}
func (s *MockIDriverClient) Name() string {
return "mock"
}
func (s *MockIDriverClient) FindPeers(ctx context.Context, topic string, opts ...discovery.Option) (<-chan peer.AddrInfo, error) {
var options discovery.Options
err := options.Apply(opts...)
if err != nil {
return nil, err
}
if options.Ttl == 0 {
options.Limit = 1000
}
return s.serv.FindPeers(topic, options.Limit), nil
}
func (s *MockIDriverClient) Advertise(ctx context.Context, topic string, opts ...discovery.Option) (time.Duration, error) {
var options discovery.Options
err := options.Apply(opts...)
if err != nil {
return 0, err
}
if options.Ttl == 0 {
options.Ttl = time.Second * 10
}
info := s.h.Peerstore().PeerInfo(s.h.ID())
s.serv.Advertise(topic, info, options.Ttl)
return options.Ttl, nil
}
func (s *MockIDriverClient) Subscribe(ctx context.Context, topic string, opts ...discovery.Option) (<-chan peer.AddrInfo, error) {
var options discovery.Options
err := options.Apply(opts...)
if err != nil {
return nil, err
}
v := options.Other[optionSubscribeBufferSize]
var buffsize int
var ok bool
if buffsize, ok = v.(int); !ok || buffsize == 0 {
buffsize = 16
}
out := s.serv.Subscribe(ctx, topic, buffsize)
return out, nil
}
func (s *MockIDriverClient) Unregister(ctx context.Context, topic string, opts ...discovery.Option) error {
s.serv.Unregister(ctx, topic, s.h.ID())
return nil
}
type discOption string
const (
optionSubscribeBufferSize discOption = "tinder_subsize"
)
func MockBufferSize(size int) discovery.Option {
return func(opts *discovery.Options) error {
if opts.Other == nil {
opts.Other = make(map[interface{}]interface{})
}
opts.Other[optionSubscribeBufferSize] = size
return nil
}
}