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addr_book.go
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addr_book.go
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package pstoreds
import (
"context"
"encoding/binary"
"errors"
"time"
lru "github.com/hashicorp/golang-lru"
base32 "github.com/whyrusleeping/base32"
ds "github.com/ipfs/go-datastore"
query "github.com/ipfs/go-datastore/query"
logging "github.com/ipfs/go-log"
ma "github.com/multiformats/go-multiaddr"
mh "github.com/multiformats/go-multihash"
peer "github.com/libp2p/go-libp2p-peer"
pstore "github.com/libp2p/go-libp2p-peerstore"
pstoremem "github.com/libp2p/go-libp2p-peerstore/pstoremem"
)
var (
log = logging.Logger("peerstore/ds")
// The maximum representable value in time.Time is time.Unix(1<<63-62135596801, 999999999).
// But it's too brittle and implementation-dependent, so we prefer to use 1<<62, which is in the
// year 146138514283. We're safe.
maxTime = time.Unix(1<<62, 0)
ErrTTLDatastore = errors.New("datastore must provide TTL support")
)
// Peer addresses are stored under the following db key pattern:
// /peers/addr/<b32 peer id no padding>/<hash of maddr>
var abBase = ds.NewKey("/peers/addrs")
var _ pstore.AddrBook = (*dsAddrBook)(nil)
// dsAddrBook is an address book backed by a Datastore with both an
// in-memory TTL manager and an in-memory address stream manager.
type dsAddrBook struct {
cache cache
ds ds.TxnDatastore
subsManager *pstoremem.AddrSubManager
writeRetries int
}
type ttlWriteMode int
const (
ttlOverride ttlWriteMode = iota
ttlExtend
)
type cacheEntry struct {
expiration time.Time
addrs []ma.Multiaddr
}
type addrRecord struct {
ttl time.Duration
addr ma.Multiaddr
}
func (ar *addrRecord) MarshalBinary() ([]byte, error) {
ttlB := make([]byte, 8)
binary.LittleEndian.PutUint64(ttlB, uint64(ar.ttl))
return append(ttlB, ar.addr.Bytes()...), nil
}
func (ar *addrRecord) UnmarshalBinary(b []byte) error {
ar.ttl = time.Duration(binary.LittleEndian.Uint64(b))
// this had been serialized by us, no need to check for errors
ar.addr, _ = ma.NewMultiaddrBytes(b[8:])
return nil
}
// NewAddrBook initializes a new address book given a
// Datastore instance, a context for managing the TTL manager,
// and the interval at which the TTL manager should sweep the Datastore.
func NewAddrBook(ctx context.Context, store ds.TxnDatastore, opts Options) (*dsAddrBook, error) {
if _, ok := store.(ds.TTLDatastore); !ok {
return nil, ErrTTLDatastore
}
var (
cache cache = &noopCache{}
err error
)
if opts.CacheSize > 0 {
if cache, err = lru.NewARC(int(opts.CacheSize)); err != nil {
return nil, err
}
}
mgr := &dsAddrBook{
cache: cache,
ds: store,
subsManager: pstoremem.NewAddrSubManager(),
writeRetries: int(opts.WriteRetries),
}
return mgr, nil
}
func keysAndAddrs(p peer.ID, addrs []ma.Multiaddr) ([]ds.Key, []ma.Multiaddr, error) {
var (
keys = make([]ds.Key, len(addrs))
clean = make([]ma.Multiaddr, len(addrs))
parentKey = abBase.ChildString(base32.RawStdEncoding.EncodeToString([]byte(p)))
i = 0
)
for _, addr := range addrs {
if addr == nil {
continue
}
hash, err := mh.Sum((addr).Bytes(), mh.MURMUR3, -1)
if err != nil {
return nil, nil, err
}
keys[i] = parentKey.ChildString(base32.RawStdEncoding.EncodeToString(hash))
clean[i] = addr
i++
}
return keys[:i], clean[:i], nil
}
// AddAddr will add a new address if it's not already in the AddrBook.
func (mgr *dsAddrBook) AddAddr(p peer.ID, addr ma.Multiaddr, ttl time.Duration) {
mgr.AddAddrs(p, []ma.Multiaddr{addr}, ttl)
}
// AddAddrs will add many new addresses if they're not already in the AddrBook.
func (mgr *dsAddrBook) AddAddrs(p peer.ID, addrs []ma.Multiaddr, ttl time.Duration) {
if ttl <= 0 {
return
}
mgr.setAddrs(p, addrs, ttl, ttlExtend)
}
// SetAddr will add or update the TTL of an address in the AddrBook.
func (mgr *dsAddrBook) SetAddr(p peer.ID, addr ma.Multiaddr, ttl time.Duration) {
addrs := []ma.Multiaddr{addr}
mgr.SetAddrs(p, addrs, ttl)
}
// SetAddrs will add or update the TTLs of addresses in the AddrBook.
func (mgr *dsAddrBook) SetAddrs(p peer.ID, addrs []ma.Multiaddr, ttl time.Duration) {
if ttl <= 0 {
mgr.deleteAddrs(p, addrs)
return
}
mgr.setAddrs(p, addrs, ttl, ttlOverride)
}
func (mgr *dsAddrBook) deleteAddrs(p peer.ID, addrs []ma.Multiaddr) error {
// Keys and cleaned up addresses.
keys, addrs, err := keysAndAddrs(p, addrs)
if err != nil {
return err
}
mgr.cache.Remove(p)
// Attempt transactional KV deletion.
for i := 0; i < mgr.writeRetries; i++ {
if err = mgr.dbDelete(keys); err == nil {
break
}
log.Errorf("failed to delete addresses for peer %s: %s\n", p.Pretty(), err)
}
if err != nil {
log.Errorf("failed to avoid write conflict for peer %s after %d retries: %v\n", p.Pretty(), mgr.writeRetries, err)
return err
}
return nil
}
func (mgr *dsAddrBook) setAddrs(p peer.ID, addrs []ma.Multiaddr, ttl time.Duration, mode ttlWriteMode) error {
// Keys and cleaned up addresses.
keys, addrs, err := keysAndAddrs(p, addrs)
if err != nil {
return err
}
mgr.cache.Remove(p)
// Attempt transactional KV insertion.
var existed []bool
for i := 0; i < mgr.writeRetries; i++ {
if existed, err = mgr.dbInsert(keys, addrs, ttl, mode); err == nil {
break
}
log.Errorf("failed to write addresses for peer %s: %s\n", p.Pretty(), err)
}
if err != nil {
log.Errorf("failed to avoid write conflict for peer %s after %d retries: %v\n", p.Pretty(), mgr.writeRetries, err)
return err
}
// Update was successful, so broadcast event only for new addresses.
for i, _ := range keys {
if !existed[i] {
mgr.subsManager.BroadcastAddr(p, addrs[i])
}
}
return nil
}
// dbInsert performs a transactional insert of the provided keys and values.
func (mgr *dsAddrBook) dbInsert(keys []ds.Key, addrs []ma.Multiaddr, ttl time.Duration, mode ttlWriteMode) ([]bool, error) {
var (
err error
existed = make([]bool, len(keys))
exp = time.Now().Add(ttl)
)
txn, err := mgr.ds.NewTransaction(false)
if err != nil {
return nil, err
}
defer txn.Discard()
ttltxn := txn.(ds.TTLDatastore)
for i, key := range keys {
// Check if the key existed previously.
if existed[i], err = ttltxn.Has(key); err != nil {
log.Errorf("transaction failed and aborted while checking key existence: %s, cause: %v", key.String(), err)
return nil, err
}
// The key embeds a hash of the value, so if it existed, we can safely skip the insert and
// just update the TTL.
if existed[i] {
switch mode {
case ttlOverride:
err = ttltxn.SetTTL(key, ttl)
case ttlExtend:
var curr time.Time
if curr, err = ttltxn.GetExpiration(key); err == nil && exp.After(curr) {
err = ttltxn.SetTTL(key, ttl)
}
}
if err != nil {
// mode will be printed as an int
log.Errorf("failed while updating the ttl for key: %s, mode: %v, cause: %v", key.String(), mode, err)
return nil, err
}
continue
}
r := &addrRecord{
ttl: ttl,
addr: addrs[i],
}
value, _ := r.MarshalBinary()
if err = ttltxn.PutWithTTL(key, value, ttl); err != nil {
log.Errorf("transaction failed and aborted while setting key: %s, cause: %v", key.String(), err)
return nil, err
}
}
if err = txn.Commit(); err != nil {
log.Errorf("failed to commit transaction when setting keys, cause: %v", err)
return nil, err
}
return existed, nil
}
// UpdateAddrs will update any addresses for a given peer and TTL combination to
// have a new TTL.
func (mgr *dsAddrBook) UpdateAddrs(p peer.ID, oldTTL time.Duration, newTTL time.Duration) {
mgr.cache.Remove(p)
var err error
for i := 0; i < mgr.writeRetries; i++ {
if err = mgr.dbUpdateTTL(p, oldTTL, newTTL); err == nil {
break
}
log.Errorf("failed to update ttlsfor peer %s: %s\n", p.Pretty(), err)
}
if err != nil {
log.Errorf("failed to avoid write conflict when updating ttls for peer %s after %d retries: %v\n",
p.Pretty(), mgr.writeRetries, err)
}
}
func (mgr *dsAddrBook) dbUpdateTTL(p peer.ID, oldTTL time.Duration, newTTL time.Duration) error {
var (
prefix = abBase.ChildString(base32.RawStdEncoding.EncodeToString([]byte(p)))
q = query.Query{Prefix: prefix.String(), KeysOnly: false}
results query.Results
err error
)
txn, err := mgr.ds.NewTransaction(false)
if err != nil {
return err
}
defer txn.Discard()
if results, err = txn.Query(q); err != nil {
return err
}
defer results.Close()
ttltxn := txn.(ds.TTLDatastore)
r := &addrRecord{}
for result := range results.Next() {
r.UnmarshalBinary(result.Value)
if r.ttl != oldTTL {
continue
}
r.ttl = newTTL
value, _ := r.MarshalBinary()
if err = ttltxn.PutWithTTL(ds.RawKey(result.Key), value, newTTL); err != nil {
return err
}
}
if err := txn.Commit(); err != nil {
log.Errorf("failed to commit transaction when updating ttls, cause: %v", err)
return err
}
return nil
}
// Addrs returns all of the non-expired addresses for a given peer.
func (mgr *dsAddrBook) Addrs(p peer.ID) []ma.Multiaddr {
var (
prefix = abBase.ChildString(base32.RawStdEncoding.EncodeToString([]byte(p)))
q = query.Query{Prefix: prefix.String(), KeysOnly: false, ReturnExpirations: true}
results query.Results
err error
)
// Check the cache and return the entry only if it hasn't expired; if expired, remove.
if e, ok := mgr.cache.Get(p); ok {
entry := e.(cacheEntry)
if entry.expiration.After(time.Now()) {
addrs := make([]ma.Multiaddr, len(entry.addrs))
copy(addrs, entry.addrs)
return addrs
} else {
mgr.cache.Remove(p)
}
}
txn, err := mgr.ds.NewTransaction(true)
if err != nil {
return nil
}
defer txn.Discard()
if results, err = txn.Query(q); err != nil {
log.Error(err)
return nil
}
defer results.Close()
var addrs []ma.Multiaddr
var r addrRecord
// used to set the expiration for the entire cache entry
earliestExp := maxTime
for result := range results.Next() {
if err = r.UnmarshalBinary(result.Value); err == nil {
addrs = append(addrs, r.addr)
}
if exp := result.Expiration; !exp.IsZero() && exp.Before(earliestExp) {
earliestExp = exp
}
}
// Store a copy in the cache.
addrsCpy := make([]ma.Multiaddr, len(addrs))
copy(addrsCpy, addrs)
entry := cacheEntry{addrs: addrsCpy, expiration: earliestExp}
mgr.cache.Add(p, entry)
return addrs
}
// Peers returns all of the peer IDs for which the AddrBook has addresses.
func (mgr *dsAddrBook) PeersWithAddrs() peer.IDSlice {
ids, err := uniquePeerIds(mgr.ds, abBase, func(result query.Result) string {
return ds.RawKey(result.Key).Parent().Name()
})
if err != nil {
log.Errorf("error while retrieving peers with addresses: %v", err)
}
return ids
}
// AddrStream returns a channel on which all new addresses discovered for a
// given peer ID will be published.
func (mgr *dsAddrBook) AddrStream(ctx context.Context, p peer.ID) <-chan ma.Multiaddr {
initial := mgr.Addrs(p)
return mgr.subsManager.AddrStream(ctx, p, initial)
}
// ClearAddrs will delete all known addresses for a peer ID.
func (mgr *dsAddrBook) ClearAddrs(p peer.ID) {
var (
err error
prefix = abBase.ChildString(base32.RawStdEncoding.EncodeToString([]byte(p)))
deleteFn func() error
)
if e, ok := mgr.cache.Peek(p); ok {
mgr.cache.Remove(p)
keys, _, _ := keysAndAddrs(p, e.(cacheEntry).addrs)
deleteFn = func() error {
return mgr.dbDelete(keys)
}
} else {
deleteFn = func() error {
return mgr.dbDeleteIter(prefix)
}
}
// Attempt transactional KV deletion.
for i := 0; i < mgr.writeRetries; i++ {
if err = deleteFn(); err == nil {
break
}
log.Errorf("failed to clear addresses for peer %s: %s\n", p.Pretty(), err)
}
if err != nil {
log.Errorf("failed to clear addresses for peer %s after %d attempts\n", p.Pretty(), mgr.writeRetries)
}
}
// dbDelete transactionally deletes the provided keys.
func (mgr *dsAddrBook) dbDelete(keys []ds.Key) error {
var err error
txn, err := mgr.ds.NewTransaction(false)
if err != nil {
return err
}
defer txn.Discard()
for _, key := range keys {
if err = txn.Delete(key); err != nil {
log.Errorf("failed to delete key: %s, cause: %v", key.String(), err)
return err
}
}
if err = txn.Commit(); err != nil {
log.Errorf("failed to commit transaction when deleting keys, cause: %v", err)
return err
}
return nil
}
// dbDeleteIter removes all entries whose keys are prefixed with the argument.
// it returns a slice of the removed keys in case it's needed
func (mgr *dsAddrBook) dbDeleteIter(prefix ds.Key) error {
q := query.Query{Prefix: prefix.String(), KeysOnly: true}
txn, err := mgr.ds.NewTransaction(false)
if err != nil {
return err
}
defer txn.Discard()
results, err := txn.Query(q)
if err != nil {
log.Errorf("failed to fetch all keys prefixed with: %s, cause: %v", prefix.String(), err)
return err
}
var keys = make([]ds.Key, 0, 4) // cap: 4 to reduce allocs
var key ds.Key
for result := range results.Next() {
key = ds.RawKey(result.Key)
keys = append(keys, key)
if err = txn.Delete(key); err != nil {
log.Errorf("failed to delete key: %s, cause: %v", key.String(), err)
return err
}
}
if err = results.Close(); err != nil {
log.Errorf("failed to close cursor, cause: %v", err)
return err
}
if err = txn.Commit(); err != nil {
log.Errorf("failed to commit transaction when deleting keys, cause: %v", err)
return err
}
return nil
}