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mocks.go
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mocks.go
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package mocks
import (
"context"
"sync"
"time"
"github.com/libp2p/go-libp2p-core/discovery"
"github.com/libp2p/go-libp2p-core/host"
"github.com/libp2p/go-libp2p-core/peer"
)
type MockDiscoveryServer struct {
mx sync.Mutex
db map[string]map[peer.ID]*discoveryRegistration
}
type discoveryRegistration struct {
info peer.AddrInfo
expiration time.Time
}
func NewDiscoveryServer() *MockDiscoveryServer {
return &MockDiscoveryServer{
db: make(map[string]map[peer.ID]*discoveryRegistration),
}
}
func (s *MockDiscoveryServer) Advertise(ns string, info peer.AddrInfo, ttl time.Duration) (time.Duration, error) {
s.mx.Lock()
defer s.mx.Unlock()
peers, ok := s.db[ns]
if !ok {
peers = make(map[peer.ID]*discoveryRegistration)
s.db[ns] = peers
}
peers[info.ID] = &discoveryRegistration{info, time.Now().Add(ttl)}
return ttl, nil
}
func (s *MockDiscoveryServer) FindPeers(ns string, limit int) (<-chan peer.AddrInfo, error) {
s.mx.Lock()
defer s.mx.Unlock()
peers, ok := s.db[ns]
if !ok || len(peers) == 0 {
emptyCh := make(chan peer.AddrInfo)
close(emptyCh)
return emptyCh, nil
}
count := len(peers)
if limit != 0 && count > limit {
count = limit
}
iterTime := time.Now()
ch := make(chan peer.AddrInfo, count)
numSent := 0
for p, reg := range peers {
if numSent == count {
break
}
if iterTime.After(reg.expiration) {
delete(peers, p)
continue
}
numSent++
ch <- reg.info
}
close(ch)
return ch, nil
}
type MockDiscoveryClient struct {
host host.Host
server *MockDiscoveryServer
}
func NewDiscoveryClient(h host.Host, server *MockDiscoveryServer) *MockDiscoveryClient {
return &MockDiscoveryClient{
host: h,
server: server,
}
}
func (d *MockDiscoveryClient) Advertise(ctx context.Context, ns string, opts ...discovery.Option) (time.Duration, error) {
var options discovery.Options
err := options.Apply(opts...)
if err != nil {
return 0, err
}
return d.server.Advertise(ns, *host.InfoFromHost(d.host), options.Ttl)
}
func (d *MockDiscoveryClient) FindPeers(ctx context.Context, ns string, opts ...discovery.Option) (<-chan peer.AddrInfo, error) {
var options discovery.Options
err := options.Apply(opts...)
if err != nil {
return nil, err
}
return d.server.FindPeers(ns, options.Limit)
}