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multiplex_client.go
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/
multiplex_client.go
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package client
import (
"context"
"fmt"
"github.com/chainbound/fiber-go/filter"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
lru "github.com/hashicorp/golang-lru/v2"
"golang.org/x/sync/errgroup"
)
type MultiplexClient struct {
targets []string
clients []*Client
txCache *lru.Cache[common.Hash, struct{}]
headerCache *lru.Cache[common.Hash, struct{}]
payloadCache *lru.Cache[common.Hash, struct{}]
beaconCache *lru.Cache[common.Hash, struct{}]
}
// Returns a new multiplex client with the given targets.
func NewMultiplexClient(targets []string, apiKey string) *MultiplexClient {
clients := make([]*Client, len(targets))
for i, target := range targets {
clients[i] = NewClient(target, apiKey)
}
txCache, err := lru.New[common.Hash, struct{}](8192)
if err != nil {
panic(err)
}
headerCache, err := lru.New[common.Hash, struct{}](128)
if err != nil {
panic(err)
}
payloadCache, err := lru.New[common.Hash, struct{}](128)
if err != nil {
panic(err)
}
beaconCache, err := lru.New[common.Hash, struct{}](128)
if err != nil {
panic(err)
}
return &MultiplexClient{
targets: targets,
clients: clients,
txCache: txCache,
headerCache: headerCache,
payloadCache: payloadCache,
beaconCache: beaconCache,
}
}
// Connects all the underlying clients concurrently. It blocks until the connection succeeds / fails, or the given context expires.
func (mc *MultiplexClient) Connect(ctx context.Context) error {
errGroup, ctx := errgroup.WithContext(ctx)
// Connect all clients concurrently
for _, client := range mc.clients {
// Closure stuff
client := client
errGroup.Go(func() error {
if err := client.Connect(ctx); err != nil {
return fmt.Errorf("connecting to %s: %w", client.target, err)
}
return nil
})
}
return errGroup.Wait()
}
type txRes struct {
hash string
ts int64
err error
}
// SendTransaction sends the (signed) transaction on all clients, and returns the first response it receives.
func (mc *MultiplexClient) SendTransaction(ctx context.Context, tx *types.Transaction) (string, int64, error) {
resCh := make(chan txRes, len(mc.clients))
for _, client := range mc.clients {
// Closure stuff
client := client
go func() {
hash, ts, err := client.SendTransaction(ctx, tx)
resCh <- txRes{hash, ts, err}
}()
}
res := <-resCh
return res.hash, res.ts, res.err
}
// SendRawTransaction sends the RLP encoded, signed transaction on all clients, and returns the first response it receives.
func (mc *MultiplexClient) SendRawTransaction(ctx context.Context, rawTx []byte) (string, int64, error) {
resCh := make(chan txRes, len(mc.clients))
for _, client := range mc.clients {
// Closure stuff
client := client
go func() {
hash, ts, err := client.SendRawTransaction(ctx, rawTx)
resCh <- txRes{hash, ts, err}
}()
}
res := <-resCh
return res.hash, res.ts, res.err
}
type seqRes struct {
hashes []string
ts int64
err error
}
func (mc *MultiplexClient) SendTransactionSequence(ctx context.Context, transactions ...*types.Transaction) ([]string, int64, error) {
resCh := make(chan seqRes, len(mc.clients))
for _, client := range mc.clients {
// Closure stuff
client := client
go func() {
hashes, ts, err := client.SendTransactionSequence(ctx, transactions...)
resCh <- seqRes{hashes, ts, err}
}()
}
res := <-resCh
return res.hashes, res.ts, res.err
}
func (mc *MultiplexClient) SendRawTransactionSequence(ctx context.Context, transactions ...[]byte) ([]string, int64, error) {
resCh := make(chan seqRes, len(mc.clients))
for _, client := range mc.clients {
// Closure stuff
client := client
go func() {
hashes, ts, err := client.SendRawTransactionSequence(ctx, transactions...)
resCh <- seqRes{hashes, ts, err}
}()
}
res := <-resCh
return res.hashes, res.ts, res.err
}
// SubscribeNewTxs subscribes to new transactions, and sends transactions on the given
// channel according to the filter. This function blocks and should be called in a goroutine.
// If there's an error receiving the new message it will close the channel and return the error.
// It multiplexes the subscription across all clients.
func (mc *MultiplexClient) SubscribeNewTxs(filter *filter.Filter, ch chan<- *TransactionWithSender) error {
mch := make(chan *TransactionWithSender)
errc := make(chan error, len(mc.clients))
for _, client := range mc.clients {
client := client
go func() {
if err := client.SubscribeNewTxs(filter, mch); err != nil {
errc <- err
}
}()
}
for {
select {
case tx := <-mch:
if _, ok := mc.txCache.Get(tx.Transaction.Hash()); ok {
continue
}
mc.txCache.Add(tx.Transaction.Hash(), struct{}{})
ch <- tx
case err := <-errc:
return err
}
}
}
// SubscribeNewBeaconHeaders subscribes to new beacon headers, and sends headers on the given channel. This function blocks
// and should be called in a goroutine.
// It multiplexes the subscription across all clients.
func (mc *MultiplexClient) SubscribeNewExecutionPayloads(ch chan<- *Block) error {
mch := make(chan *Block)
errc := make(chan error, len(mc.clients))
for _, client := range mc.clients {
client := client
go func() {
if err := client.SubscribeNewExecutionPayloads(mch); err != nil {
errc <- err
}
}()
}
for {
select {
case payload := <-mch:
if _, ok := mc.payloadCache.Get(payload.Hash); ok {
continue
}
mc.payloadCache.Add(payload.Hash, struct{}{})
ch <- payload
case err := <-errc:
return err
}
}
}
// SubscribeNewBeaconHeaders subscribes to new beacon headers, and sends headers on the given channel. This function blocks
// and should be called in a goroutine.
// It multiplexes the subscription across all clients.
func (mc *MultiplexClient) SubscribeNewBeaconBlocks(ch chan<- *SignedBeaconBlock) error {
mch := make(chan *SignedBeaconBlock)
errc := make(chan error, len(mc.clients))
for _, client := range mc.clients {
client := client
go func() {
if err := client.SubscribeNewBeaconBlocks(mch); err != nil {
errc <- err
}
}()
}
for {
select {
case block := <-mch:
if _, ok := mc.beaconCache.Get(block.StateRoot()); ok {
continue
}
mc.beaconCache.Add(block.StateRoot(), struct{}{})
ch <- block
case err := <-errc:
return err
}
}
}
func (mc *MultiplexClient) Close() error {
errGroup, _ := errgroup.WithContext(context.Background())
// Connect all clients concurrently
for _, client := range mc.clients {
// Closure stuff
client := client
errGroup.Go(func() error {
if err := client.Close(); err != nil {
return fmt.Errorf("closing %s: %w", client.target, err)
}
return nil
})
}
return errGroup.Wait()
}