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service.go
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service.go
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package tinder
import (
"context"
"fmt"
"io"
"time"
p2p_discovery "github.com/libp2p/go-libp2p-core/discovery"
p2p_event "github.com/libp2p/go-libp2p-core/event"
"github.com/libp2p/go-libp2p-core/host"
p2p_peer "github.com/libp2p/go-libp2p-core/peer"
"go.uber.org/zap"
)
const TinderPeer = "Berty/TinderPeer"
const (
DefaultFindPeerInterval = time.Minute * 30
DefaultAdvertiseInterval = time.Minute
DefaultAdvertiseGracePeriod = time.Second * 10
)
type EventMonitor int
const (
TypeEventMonitorUnknown EventMonitor = iota
TypeEventMonitorDriverAdvertise
TypeEventMonitorDriverFoundPeer
TypeEventMonitorAdvertise
TypeEventMonitorFoundPeer
)
type EvtDriverMonitor struct {
EventType EventMonitor
Topic string
AddrInfo p2p_peer.AddrInfo
DriverName string
}
type Service interface {
UnregisterDiscovery
io.Closer
}
type service struct {
p2p_discovery.Discovery
Unregisterer
logger *zap.Logger
nnotify *NetworkUpdate
emitter p2p_event.Emitter
doneCtx context.CancelFunc
}
type Opts struct {
Logger *zap.Logger
EnableDiscoveryMonitor bool
AdvertiseResetInterval time.Duration
AdvertiseGracePeriod time.Duration
FindPeerResetInterval time.Duration
// BackoffStrategy describes how backoff will be implemented on the
// FindPeer method. If none are provided, it will be disable alongside
// cache.
BackoffStrategy *BackoffOpts
}
func (o *Opts) applyDefault() {
if o.Logger == nil {
o.Logger = zap.NewNop()
}
o.Logger = o.Logger.Named("tinder")
if o.AdvertiseResetInterval == 0 && o.AdvertiseGracePeriod == 0 {
o.AdvertiseResetInterval = DefaultAdvertiseInterval
o.AdvertiseGracePeriod = DefaultAdvertiseGracePeriod
}
if o.FindPeerResetInterval == 0 {
o.FindPeerResetInterval = DefaultFindPeerInterval
}
}
func NewService(opts *Opts, h host.Host, drivers ...*Driver) (Service, error) {
// validate opts
opts.applyDefault()
for _, driver := range drivers {
if err := driver.applyDefault(); err != nil {
return nil, fmt.Errorf("invalid driver %w", err)
}
}
notify, err := NewNetworkUpdate(opts.Logger, h)
if err != nil {
return nil, err
}
// create monitor update
emitter, err := h.EventBus().Emitter(new(EvtDriverMonitor))
if err != nil {
return nil, err
}
ctx, cancel := context.WithCancel(context.Background())
wa := newWatchdogsAdvertiser(ctx, opts.Logger, h, notify, opts.AdvertiseResetInterval, opts.AdvertiseGracePeriod, drivers)
wd, err := newWatchdogsDiscoverer(ctx, opts.Logger, h, opts.FindPeerResetInterval, opts.BackoffStrategy, drivers)
if err != nil {
cancel()
return nil, err
}
// compose discovery
var disc p2p_discovery.Discovery = &DriverDiscovery{
Advertiser: wa,
Discoverer: wd,
}
// enable monitor if needed
if opts.EnableDiscoveryMonitor {
disc = &discoveryMonitor{
host: h,
logger: opts.Logger,
disc: disc,
emitter: emitter,
}
}
return &service{
Discovery: disc,
Unregisterer: wa,
logger: opts.Logger,
nnotify: notify,
emitter: emitter,
doneCtx: cancel,
}, nil
}
func (s *service) Close() error {
s.doneCtx()
// we only want to log errors here, discard them on return
if err := s.emitter.Close(); err != nil {
s.logger.Warn("unable to close service emitter", zap.Error(err))
}
if err := s.nnotify.Close(); err != nil {
s.logger.Warn("unable to close network notify", zap.Error(err))
}
return nil
}