ceremonyclient/go-libp2p/p2p/host/peerstore/pstoreds/keybook.go

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package pstoreds
import (
"context"
"errors"
ic "github.com/libp2p/go-libp2p/core/crypto"
"github.com/libp2p/go-libp2p/core/peer"
pstore "github.com/libp2p/go-libp2p/core/peerstore"
ds "github.com/ipfs/go-datastore"
"github.com/ipfs/go-datastore/query"
"github.com/multiformats/go-base32"
)
// Public and private keys are stored under the following db key pattern:
// /peers/keys/<b32 peer id no padding>/{pub, priv}
var (
kbBase = ds.NewKey("/peers/keys")
pubSuffix = ds.NewKey("/pub")
privSuffix = ds.NewKey("/priv")
)
type dsKeyBook struct {
ds ds.Datastore
}
var _ pstore.KeyBook = (*dsKeyBook)(nil)
func NewKeyBook(_ context.Context, store ds.Datastore, _ Options) (*dsKeyBook, error) {
return &dsKeyBook{store}, nil
}
func (kb *dsKeyBook) PubKey(p peer.ID) ic.PubKey {
key := peerToKey(p, pubSuffix)
var pk ic.PubKey
if value, err := kb.ds.Get(context.TODO(), key); err == nil {
pk, err = ic.UnmarshalPublicKey(value)
if err != nil {
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log.Errorf("error when unmarshalling pubkey from datastore for peer %s: %s\n", p, err)
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}
} else if err == ds.ErrNotFound {
pk, err = p.ExtractPublicKey()
switch err {
case nil:
case peer.ErrNoPublicKey:
return nil
default:
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log.Errorf("error when extracting pubkey from peer ID for peer %s: %s\n", p, err)
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return nil
}
pkb, err := ic.MarshalPublicKey(pk)
if err != nil {
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log.Errorf("error when turning extracted pubkey into bytes for peer %s: %s\n", p, err)
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return nil
}
if err := kb.ds.Put(context.TODO(), key, pkb); err != nil {
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log.Errorf("error when adding extracted pubkey to peerstore for peer %s: %s\n", p, err)
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return nil
}
} else {
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log.Errorf("error when fetching pubkey from datastore for peer %s: %s\n", p, err)
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}
return pk
}
func (kb *dsKeyBook) AddPubKey(p peer.ID, pk ic.PubKey) error {
// check it's correct.
if !p.MatchesPublicKey(pk) {
return errors.New("peer ID does not match public key")
}
val, err := ic.MarshalPublicKey(pk)
if err != nil {
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log.Errorf("error while converting pubkey byte string for peer %s: %s\n", p, err)
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return err
}
if err := kb.ds.Put(context.TODO(), peerToKey(p, pubSuffix), val); err != nil {
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log.Errorf("error while updating pubkey in datastore for peer %s: %s\n", p, err)
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return err
}
return nil
}
func (kb *dsKeyBook) PrivKey(p peer.ID) ic.PrivKey {
value, err := kb.ds.Get(context.TODO(), peerToKey(p, privSuffix))
if err != nil {
return nil
}
sk, err := ic.UnmarshalPrivateKey(value)
if err != nil {
return nil
}
return sk
}
func (kb *dsKeyBook) AddPrivKey(p peer.ID, sk ic.PrivKey) error {
if sk == nil {
return errors.New("private key is nil")
}
// check it's correct.
if !p.MatchesPrivateKey(sk) {
return errors.New("peer ID does not match private key")
}
val, err := ic.MarshalPrivateKey(sk)
if err != nil {
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log.Errorf("error while converting privkey byte string for peer %s: %s\n", p, err)
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return err
}
if err := kb.ds.Put(context.TODO(), peerToKey(p, privSuffix), val); err != nil {
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log.Errorf("error while updating privkey in datastore for peer %s: %s\n", p, err)
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}
return err
}
func (kb *dsKeyBook) PeersWithKeys() peer.IDSlice {
ids, err := uniquePeerIds(kb.ds, kbBase, func(result query.Result) string {
return ds.RawKey(result.Key).Parent().Name()
})
if err != nil {
log.Errorf("error while retrieving peers with keys: %v", err)
}
return ids
}
func (kb *dsKeyBook) RemovePeer(p peer.ID) {
kb.ds.Delete(context.TODO(), peerToKey(p, privSuffix))
kb.ds.Delete(context.TODO(), peerToKey(p, pubSuffix))
}
func peerToKey(p peer.ID, suffix ds.Key) ds.Key {
return kbBase.ChildString(base32.RawStdEncoding.EncodeToString([]byte(p))).Child(suffix)
}