package ipfscluster import ( "bytes" "encoding/json" "errors" "fmt" "net" blake2b "golang.org/x/crypto/blake2b" "github.com/ipfs-cluster/ipfs-cluster/api" peer "github.com/libp2p/go-libp2p/core/peer" ma "github.com/multiformats/go-multiaddr" madns "github.com/multiformats/go-multiaddr-dns" ) // PeersFromMultiaddrs returns all the different peers in the given addresses. // each peer only will appear once in the result, even if several // multiaddresses for it are provided. func PeersFromMultiaddrs(addrs []ma.Multiaddr) []peer.ID { var pids []peer.ID pm := make(map[peer.ID]struct{}) for _, addr := range addrs { pinfo, err := peer.AddrInfoFromP2pAddr(addr) if err != nil { continue } _, ok := pm[pinfo.ID] if !ok { pm[pinfo.ID] = struct{}{} pids = append(pids, pinfo.ID) } } return pids } // // connect to a peer ID. // func connectToPeer(ctx context.Context, h host.Host, id peer.ID, addr ma.Multiaddr) error { // err := h.Connect(ctx, peerstore.PeerInfo{ // ID: id, // Addrs: []ma.Multiaddr{addr}, // }) // return err // } // // return the local multiaddresses used to communicate to a peer. // func localMultiaddrsTo(h host.Host, pid peer.ID) []ma.Multiaddr { // var addrs []ma.Multiaddr // conns := h.Network().ConnsToPeer(pid) // logger.Debugf("conns to %s are: %s", pid, conns) // for _, conn := range conns { // addrs = append(addrs, multiaddrJoin(conn.LocalMultiaddr(), h.ID())) // } // return addrs // } func logError(fmtstr string, args ...interface{}) error { msg := fmt.Sprintf(fmtstr, args...) logger.Error(msg) return errors.New(msg) } func containsPeer(list []peer.ID, peer peer.ID) bool { for _, p := range list { if p == peer { return true } } return false } func minInt(x, y int) int { if x < y { return x } return y } // // updatePinParents modifies the api.Pin input to give it the correct parents // // so that previous additions to the pins parents are maintained after this // // pin is committed to consensus. If this pin carries new parents they are // // merged with those already existing for this CID. // func updatePinParents(pin *api.Pin, existing *api.Pin) { // // no existing parents this pin is up to date // if existing.Parents == nil || len(existing.Parents.Keys()) == 0 { // return // } // for _, c := range existing.Parents.Keys() { // pin.Parents.Add(c) // } // } type distance [blake2b.Size256]byte type distanceChecker struct { local peer.ID otherPeers []peer.ID cache map[peer.ID]distance } func (dc distanceChecker) isClosest(ci api.Cid) bool { ciHash := convertKey(ci.KeyString()) localPeerHash := dc.convertPeerID(dc.local) myDistance := xor(ciHash, localPeerHash) for _, p := range dc.otherPeers { peerHash := dc.convertPeerID(p) distance := xor(peerHash, ciHash) // if myDistance is larger than for other peers... if bytes.Compare(myDistance[:], distance[:]) > 0 { return false } } return true } // convertPeerID hashes a Peer ID (Multihash). func (dc distanceChecker) convertPeerID(id peer.ID) distance { hash, ok := dc.cache[id] if ok { return hash } hashBytes := convertKey(string(id)) dc.cache[id] = hashBytes return hashBytes } // convertKey hashes a key. func convertKey(id string) distance { return blake2b.Sum256([]byte(id)) } func xor(a, b distance) distance { var c distance for i := 0; i < len(c); i++ { c[i] = a[i] ^ b[i] } return c } // peersSubtract subtracts peers ID slice b from peers ID slice a. func peersSubtract(a []peer.ID, b []peer.ID) []peer.ID { var result []peer.ID bMap := make(map[peer.ID]struct{}, len(b)) for _, p := range b { bMap[p] = struct{}{} } for _, p := range a { _, ok := bMap[p] if ok { continue } result = append(result, p) } return result } // pingValue describes the value carried by ping metrics type pingValue struct { Peername string `json:"peer_name,omitempty"` IPFSID peer.ID `json:"ipfs_id,omitempty"` IPFSAddresses []api.Multiaddr `json:"ipfs_addresses,omitempty"` } // Valid returns true if the PingValue has IPFSID set. func (pv pingValue) Valid() bool { return pv.IPFSID != "" } // PingValue from metric parses a ping value from the value of a given metric, // if possible. func pingValueFromMetric(m api.Metric) (pv pingValue) { json.Unmarshal([]byte(m.Value), &pv) return } func publicIPFSAddresses(in []api.Multiaddr) []api.Multiaddr { var out []api.Multiaddr for _, maddr := range in { if madns.Matches(maddr.Value()) { // a dns multiaddress: take it out = append(out, maddr) continue } ip, err := maddr.ValueForProtocol(ma.P_IP4) if err != nil { ip, err = maddr.ValueForProtocol(ma.P_IP6) if err != nil { continue } } // We have an IP in the multiaddress. Only include // global unicast. netip := net.ParseIP(ip) if netip == nil { continue } if !netip.IsGlobalUnicast() { continue } out = append(out, maddr) } return out }