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namesys.go
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namesys.go
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package namesys
import (
"context"
"errors"
"strings"
"sync"
"time"
path "github.com/ipfs/go-ipfs/path"
p2phost "gx/ipfs/QmNmJZL7FQySMtE2BQuLMuZg2EB2CLEunJJUSVSc9YnnbV/go-libp2p-host"
ds "gx/ipfs/QmPpegoMqhAEqjncrzArm7KVWAkCm78rqL2DPuNjhPrshg/go-datastore"
floodsub "gx/ipfs/QmSFihvoND3eDaAYRCeLgLPt62yCPgMZs1NSZmKFEtJQQw/go-libp2p-floodsub"
routing "gx/ipfs/QmTiWLZ6Fo5j4KcTVutZJ5KWRRJrbxzmxA4td8NfEdrPh7/go-libp2p-routing"
isd "gx/ipfs/QmZmmuAXgX73UQmX1jRKjTGmjzq24Jinqkq8vzkBtno4uX/go-is-domain"
peer "gx/ipfs/QmZoWKhxUmZ2seW4BzX6fJkNR8hh9PsGModr7q171yq2SS/go-libp2p-peer"
mh "gx/ipfs/QmZyZDi491cCNTLfAhwcaDii2Kg4pwKRkhqQzURGDvY6ua/go-multihash"
ci "gx/ipfs/QmaPbCnUMBohSGo3KnxEa2bHqyJVVeEEcwtqJAYxerieBo/go-libp2p-crypto"
)
// mpns (a multi-protocol NameSystem) implements generic IPFS naming.
//
// Uses several Resolvers:
// (a) IPFS routing naming: SFS-like PKI names.
// (b) dns domains: resolves using links in DNS TXT records
// (c) proquints: interprets string as the raw byte data.
//
// It can only publish to: (a) IPFS routing naming.
//
type mpns struct {
resolvers map[string]resolver
publishers map[string]Publisher
}
// NewNameSystem will construct the IPFS naming system based on Routing
func NewNameSystem(r routing.ValueStore, ds ds.Datastore, cachesize int) NameSystem {
return &mpns{
resolvers: map[string]resolver{
"dns": newDNSResolver(),
"proquint": new(ProquintResolver),
"dht": NewRoutingResolver(r, cachesize),
},
publishers: map[string]Publisher{
"dht": NewRoutingPublisher(r, ds),
},
}
}
// AddPubsubNameSystem adds the pubsub publisher and resolver to the namesystem
func AddPubsubNameSystem(ctx context.Context, ns NameSystem, host p2phost.Host, r routing.IpfsRouting, ds ds.Datastore, ps *floodsub.PubSub) error {
mpns, ok := ns.(*mpns)
if !ok {
return errors.New("unexpected NameSystem; not an mpns instance")
}
pkf, ok := r.(routing.PubKeyFetcher)
if !ok {
return errors.New("unexpected IpfsRouting; not a PubKeyFetcher instance")
}
mpns.resolvers["pubsub"] = NewPubsubResolver(ctx, host, r, pkf, ps)
mpns.publishers["pubsub"] = NewPubsubPublisher(ctx, host, ds, r, ps)
return nil
}
const DefaultResolverCacheTTL = time.Minute
// Resolve implements Resolver.
func (ns *mpns) Resolve(ctx context.Context, name string) (path.Path, error) {
return ns.ResolveN(ctx, name, DefaultDepthLimit)
}
// ResolveN implements Resolver.
func (ns *mpns) ResolveN(ctx context.Context, name string, depth int) (path.Path, error) {
if strings.HasPrefix(name, "/ipfs/") {
return path.ParsePath(name)
}
if !strings.HasPrefix(name, "/") {
return path.ParsePath("/ipfs/" + name)
}
return resolve(ctx, ns, name, depth, "/ipns/")
}
// resolveOnce implements resolver.
func (ns *mpns) resolveOnce(ctx context.Context, name string) (path.Path, error) {
if !strings.HasPrefix(name, "/ipns/") {
name = "/ipns/" + name
}
segments := strings.SplitN(name, "/", 4)
if len(segments) < 3 || segments[0] != "" {
log.Debugf("invalid name syntax for %s", name)
return "", ErrResolveFailed
}
makePath := func(p path.Path) (path.Path, error) {
if len(segments) > 3 {
return path.FromSegments("", strings.TrimRight(p.String(), "/"), segments[3])
} else {
return p, nil
}
}
// Resolver selection:
// 1. if it is a multihash resolve through "pubsub" (if available),
// with fallback to "dht"
// 2. if it is a domain name, resolve through "dns"
// 3. otherwise resolve through the "proquint" resolver
key := segments[2]
_, err := mh.FromB58String(key)
if err == nil {
res, ok := ns.resolvers["pubsub"]
if ok {
p, err := res.resolveOnce(ctx, key)
if err == nil {
return makePath(p)
}
}
res, ok = ns.resolvers["dht"]
if ok {
p, err := res.resolveOnce(ctx, key)
if err == nil {
return makePath(p)
}
}
return "", ErrResolveFailed
}
if isd.IsDomain(key) {
res, ok := ns.resolvers["dns"]
if ok {
p, err := res.resolveOnce(ctx, key)
if err == nil {
return makePath(p)
}
}
return "", ErrResolveFailed
}
res, ok := ns.resolvers["proquint"]
if ok {
p, err := res.resolveOnce(ctx, key)
if err == nil {
return makePath(p)
}
return "", ErrResolveFailed
}
log.Debugf("no resolver found for %s", name)
return "", ErrResolveFailed
}
// Publish implements Publisher
func (ns *mpns) Publish(ctx context.Context, name ci.PrivKey, value path.Path) error {
return ns.PublishWithEOL(ctx, name, value, time.Now().Add(DefaultRecordTTL))
}
func (ns *mpns) PublishWithEOL(ctx context.Context, name ci.PrivKey, value path.Path, eol time.Time) error {
var dhtErr error
wg := &sync.WaitGroup{}
wg.Add(1)
go func() {
dhtErr = ns.publishers["dht"].PublishWithEOL(ctx, name, value, eol)
if dhtErr == nil {
ns.addToDHTCache(name, value, eol)
}
wg.Done()
}()
pub, ok := ns.publishers["pubsub"]
if ok {
wg.Add(1)
go func() {
err := pub.PublishWithEOL(ctx, name, value, eol)
if err != nil {
log.Warningf("error publishing %s with pubsub: %s", name, err.Error())
}
wg.Done()
}()
}
wg.Wait()
return dhtErr
}
func (ns *mpns) addToDHTCache(key ci.PrivKey, value path.Path, eol time.Time) {
rr, ok := ns.resolvers["dht"].(*routingResolver)
if !ok {
// should never happen, purely for sanity
log.Panicf("unexpected type %T as DHT resolver.", ns.resolvers["dht"])
}
if rr.cache == nil {
// resolver has no caching
return
}
var err error
value, err = path.ParsePath(value.String())
if err != nil {
log.Error("could not parse path")
return
}
name, err := peer.IDFromPrivateKey(key)
if err != nil {
log.Error("while adding to cache, could not get peerid from private key")
return
}
if time.Now().Add(DefaultResolverCacheTTL).Before(eol) {
eol = time.Now().Add(DefaultResolverCacheTTL)
}
rr.cache.Add(name.Pretty(), cacheEntry{
val: value,
eol: eol,
})
}
// GetResolver implements ResolverLookup
func (ns *mpns) GetResolver(subs string) (Resolver, bool) {
res, ok := ns.resolvers[subs]
if ok {
ires, ok := res.(Resolver)
if ok {
return ires, true
}
}
return nil, false
}