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balance.go
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balance.go
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package monitor
import (
"context"
"time"
"github.com/gagliardetto/solana-go"
"github.com/smartcontractkit/chainlink-relay/pkg/logger"
solanaClient "github.com/smartcontractkit/chainlink-solana/pkg/solana/client"
"github.com/smartcontractkit/chainlink/v2/core/services"
"github.com/smartcontractkit/chainlink/v2/core/utils"
)
// Config defines the monitor configuration.
type Config interface {
BalancePollPeriod() time.Duration
}
// Keystore provides the keys to be monitored.
type Keystore interface {
Accounts(ctx context.Context) ([]string, error)
}
// NewBalanceMonitor returns a balance monitoring services.Service which reports the SOL balance of all ks keys to prometheus.
func NewBalanceMonitor(chainID string, cfg Config, lggr logger.Logger, ks Keystore, newReader func() (solanaClient.Reader, error)) services.ServiceCtx {
return newBalanceMonitor(chainID, cfg, lggr, ks, newReader)
}
func newBalanceMonitor(chainID string, cfg Config, lggr logger.Logger, ks Keystore, newReader func() (solanaClient.Reader, error)) *balanceMonitor {
b := balanceMonitor{
chainID: chainID,
cfg: cfg,
lggr: logger.Named(lggr, "BalanceMonitor"),
ks: ks,
newReader: newReader,
stop: make(chan struct{}),
done: make(chan struct{}),
}
b.updateFn = b.updateProm
return &b
}
type balanceMonitor struct {
utils.StartStopOnce
chainID string
cfg Config
lggr logger.Logger
ks Keystore
newReader func() (solanaClient.Reader, error)
updateFn func(acc solana.PublicKey, lamports uint64) // overridable for testing
reader solanaClient.Reader
stop, done chan struct{}
}
func (b *balanceMonitor) Name() string {
return b.lggr.Name()
}
func (b *balanceMonitor) Start(context.Context) error {
return b.StartOnce("SolanaBalanceMonitor", func() error {
go b.monitor()
return nil
})
}
func (b *balanceMonitor) Close() error {
return b.StopOnce("SolanaBalanceMonitor", func() error {
close(b.stop)
<-b.done
return nil
})
}
func (b *balanceMonitor) HealthReport() map[string]error {
return map[string]error{b.Name(): b.Healthy()}
}
func (b *balanceMonitor) monitor() {
defer close(b.done)
ctx, cancel := utils.ContextFromChan(b.stop)
defer cancel()
tick := time.After(utils.WithJitter(b.cfg.BalancePollPeriod()))
for {
select {
case <-b.stop:
return
case <-tick:
b.updateBalances(ctx)
tick = time.After(utils.WithJitter(b.cfg.BalancePollPeriod()))
}
}
}
// getReader returns the cached solanaClient.Reader, or creates a new one if nil.
func (b *balanceMonitor) getReader() (solanaClient.Reader, error) {
if b.reader == nil {
var err error
b.reader, err = b.newReader()
if err != nil {
return nil, err
}
}
return b.reader, nil
}
func (b *balanceMonitor) updateBalances(ctx context.Context) {
keys, err := b.ks.Accounts(ctx)
if err != nil {
b.lggr.Errorw("Failed to get keys", "err", err)
return
}
if len(keys) == 0 {
return
}
reader, err := b.getReader()
if err != nil {
b.lggr.Errorw("Failed to get client", "err", err)
return
}
var gotSomeBals bool
for _, k := range keys {
// Check for shutdown signal, since Balance blocks and may be slow.
select {
case <-b.stop:
return
default:
}
pubKey, err := solana.PublicKeyFromBase58(k)
if err != nil {
b.lggr.Errorw("Failed parse public key", "account", k, "err", err)
continue
}
lamports, err := reader.Balance(pubKey)
if err != nil {
b.lggr.Errorw("Failed to get balance", "account", k, "err", err)
continue
}
gotSomeBals = true
b.updateFn(pubKey, lamports)
}
if !gotSomeBals {
// Try a new client next time.
b.reader = nil
}
}