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peerstore.go
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peerstore.go
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package ocrcommon
import (
"context"
"fmt"
"strings"
"time"
p2ppeer "github.com/libp2p/go-libp2p-core/peer"
p2ppeerstore "github.com/libp2p/go-libp2p-core/peerstore"
"github.com/libp2p/go-libp2p-peerstore/pstoremem"
ma "github.com/multiformats/go-multiaddr"
"github.com/pkg/errors"
"github.com/smartcontractkit/sqlx"
"github.com/smartcontractkit/chainlink/v2/core/logger"
"github.com/smartcontractkit/chainlink/v2/core/recovery"
"github.com/smartcontractkit/chainlink/v2/core/services/keystore/keys/p2pkey"
"github.com/smartcontractkit/chainlink/v2/core/services/pg"
"github.com/smartcontractkit/chainlink/v2/core/utils"
)
type (
P2PPeer struct {
ID string
Addr string
PeerID string
CreatedAt time.Time
UpdatedAt time.Time
}
Pstorewrapper struct {
utils.StartStopOnce
Peerstore p2ppeerstore.Peerstore
peerID string
q pg.Q
writeInterval time.Duration
ctx context.Context
ctxCancel context.CancelFunc
chDone chan struct{}
lggr logger.SugaredLogger
}
)
// NewPeerstoreWrapper creates a new database-backed peerstore wrapper scoped to the given jobID
// Multiple peerstore wrappers should not be instantiated with the same jobID
func NewPeerstoreWrapper(db *sqlx.DB, writeInterval time.Duration, peerID p2pkey.PeerID, lggr logger.Logger, cfg pg.QConfig) (*Pstorewrapper, error) {
ctx, cancel := context.WithCancel(context.Background())
namedLogger := lggr.Named("PeerStore")
q := pg.NewQ(db, namedLogger, cfg)
return &Pstorewrapper{
utils.StartStopOnce{},
pstoremem.NewPeerstore(),
peerID.Raw(),
q,
writeInterval,
ctx,
cancel,
make(chan struct{}),
logger.Sugared(namedLogger),
}, nil
}
func (p *Pstorewrapper) Start() error {
return p.StartOnce("PeerStore", func() error {
err := p.readFromDB()
if err != nil {
return errors.Wrap(err, "could not start peerstore wrapper")
}
go p.dbLoop()
return nil
})
}
func (p *Pstorewrapper) dbLoop() {
defer close(p.chDone)
ticker := time.NewTicker(utils.WithJitter(p.writeInterval))
defer ticker.Stop()
for {
select {
case <-p.ctx.Done():
return
case <-ticker.C:
recovery.WrapRecover(p.lggr, func() {
if err := p.WriteToDB(); err != nil {
p.lggr.Errorw("Error writing peerstore to DB", "err", err)
}
})
}
}
}
func (p *Pstorewrapper) Close() error {
return p.StopOnce("PeerStore", func() error {
p.ctxCancel()
<-p.chDone
return p.Peerstore.Close()
})
}
func (p *Pstorewrapper) readFromDB() error {
peers, err := p.getPeers()
if err != nil {
return err
}
for _, peer := range peers {
peerID, err := p2ppeer.Decode(peer.ID)
if err != nil {
return errors.Wrapf(err, "unexpectedly failed to decode peer ID '%s'", peer.ID)
}
peerAddr, err := ma.NewMultiaddr(peer.Addr)
if err != nil {
return errors.Wrapf(err, "unexpectedly failed to decode peer multiaddr '%s'", peer.Addr)
}
p.Peerstore.AddAddr(peerID, peerAddr, p2ppeerstore.PermanentAddrTTL)
}
return nil
}
func (p *Pstorewrapper) getPeers() (peers []P2PPeer, err error) {
rows, err := p.q.WithOpts(pg.WithParentCtx(p.ctx)).Query(`SELECT id, addr FROM p2p_peers WHERE peer_id = $1`, p.peerID)
if err != nil {
return nil, errors.Wrap(err, "error querying peers")
}
defer p.lggr.ErrorIfFn(rows.Close, "Error closing p2p_peers rows")
peers = make([]P2PPeer, 0)
for rows.Next() {
peer := P2PPeer{}
if err = rows.Scan(&peer.ID, &peer.Addr); err != nil {
return nil, errors.Wrap(err, "unexpected error scanning row")
}
peers = append(peers, peer)
}
if err = rows.Err(); err != nil {
return nil, err
}
return peers, nil
}
func (p *Pstorewrapper) WriteToDB() error {
q := p.q.WithOpts(pg.WithParentCtx(p.ctx))
err := q.Transaction(func(tx pg.Queryer) error {
_, err := tx.Exec(`DELETE FROM p2p_peers WHERE peer_id = $1`, p.peerID)
if err != nil {
return errors.Wrap(err, "delete from p2p_peers failed")
}
peers := make([]P2PPeer, 0)
for _, pid := range p.Peerstore.PeersWithAddrs() {
addrs := p.Peerstore.Addrs(pid)
for _, addr := range addrs {
p := P2PPeer{
ID: pid.String(),
Addr: addr.String(),
PeerID: p.peerID,
}
peers = append(peers, p)
}
}
valueStrings := []string{}
valueArgs := []interface{}{}
for _, p := range peers {
valueStrings = append(valueStrings, "(?, ?, ?, NOW(), NOW())")
valueArgs = append(valueArgs, p.ID)
valueArgs = append(valueArgs, p.Addr)
valueArgs = append(valueArgs, p.PeerID)
}
/* #nosec G201 */
stmt := fmt.Sprintf("INSERT INTO p2p_peers (id, addr, peer_id, created_at, updated_at) VALUES %s", strings.Join(valueStrings, ","))
stmt = sqlx.Rebind(sqlx.DOLLAR, stmt)
_, err = tx.Exec(stmt, valueArgs...)
return errors.Wrap(err, "insert into p2p_peers failed")
})
return errors.Wrap(err, "could not write peers to DB")
}