mirror of
https://source.quilibrium.com/quilibrium/ceremonyclient.git
synced 2024-12-29 10:05:16 +00:00
113 lines
2.7 KiB
Go
113 lines
2.7 KiB
Go
package routing
|
|
|
|
import (
|
|
"context"
|
|
"time"
|
|
|
|
"github.com/libp2p/go-libp2p/core/discovery"
|
|
"github.com/libp2p/go-libp2p/core/peer"
|
|
"github.com/libp2p/go-libp2p/core/routing"
|
|
|
|
"github.com/ipfs/go-cid"
|
|
mh "github.com/multiformats/go-multihash"
|
|
)
|
|
|
|
// RoutingDiscovery is an implementation of discovery using ContentRouting.
|
|
// Namespaces are translated to Cids using the SHA256 hash.
|
|
type RoutingDiscovery struct {
|
|
routing.ContentRouting
|
|
}
|
|
|
|
func NewRoutingDiscovery(router routing.ContentRouting) *RoutingDiscovery {
|
|
return &RoutingDiscovery{router}
|
|
}
|
|
|
|
func (d *RoutingDiscovery) 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
|
|
}
|
|
|
|
ttl := options.Ttl
|
|
if ttl == 0 || ttl > 3*time.Hour {
|
|
// the DHT provider record validity is 24hrs, but it is recommended to republish at least every 6hrs
|
|
// we go one step further and republish every 3hrs
|
|
ttl = 3 * time.Hour
|
|
}
|
|
|
|
cid, err := nsToCid(ns)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
// this context requires a timeout; it determines how long the DHT looks for
|
|
// closest peers to the key/CID before it goes on to provide the record to them.
|
|
// Not setting a timeout here will make the DHT wander forever.
|
|
pctx, cancel := context.WithTimeout(ctx, 60*time.Second)
|
|
defer cancel()
|
|
|
|
err = d.Provide(pctx, cid, true)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
return ttl, nil
|
|
}
|
|
|
|
func (d *RoutingDiscovery) 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
|
|
}
|
|
|
|
limit := options.Limit
|
|
if limit == 0 {
|
|
limit = 100 // that's just arbitrary, but FindProvidersAsync needs a count
|
|
}
|
|
|
|
cid, err := nsToCid(ns)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return d.FindProvidersAsync(ctx, cid, limit), nil
|
|
}
|
|
|
|
func nsToCid(ns string) (cid.Cid, error) {
|
|
h, err := mh.Sum([]byte(ns), mh.SHA2_256, -1)
|
|
if err != nil {
|
|
return cid.Undef, err
|
|
}
|
|
|
|
return cid.NewCidV1(cid.Raw, h), nil
|
|
}
|
|
|
|
func NewDiscoveryRouting(disc discovery.Discovery, opts ...discovery.Option) *DiscoveryRouting {
|
|
return &DiscoveryRouting{disc, opts}
|
|
}
|
|
|
|
type DiscoveryRouting struct {
|
|
discovery.Discovery
|
|
opts []discovery.Option
|
|
}
|
|
|
|
func (r *DiscoveryRouting) Provide(ctx context.Context, c cid.Cid, bcast bool) error {
|
|
if !bcast {
|
|
return nil
|
|
}
|
|
|
|
_, err := r.Advertise(ctx, cidToNs(c), r.opts...)
|
|
return err
|
|
}
|
|
|
|
func (r *DiscoveryRouting) FindProvidersAsync(ctx context.Context, c cid.Cid, limit int) <-chan peer.AddrInfo {
|
|
ch, _ := r.FindPeers(ctx, cidToNs(c), append([]discovery.Option{discovery.Limit(limit)}, r.opts...)...)
|
|
return ch
|
|
}
|
|
|
|
func cidToNs(c cid.Cid) string {
|
|
return "/provider/" + c.String()
|
|
}
|