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exchange.go
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exchange.go
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package core
import (
"bytes"
"context"
"fmt"
"time"
"golang.org/x/sync/errgroup"
libhead "github.com/celestiaorg/go-header"
"github.com/celestiaorg/nmt"
"github.com/celestiaorg/celestia-node/header"
"github.com/celestiaorg/celestia-node/pruner"
"github.com/celestiaorg/celestia-node/share/eds"
"github.com/celestiaorg/celestia-node/share/ipld"
)
const concurrencyLimit = 4
type Exchange struct {
fetcher *BlockFetcher
store *eds.Store
construct header.ConstructFn
availabilityWindow pruner.AvailabilityWindow
metrics *exchangeMetrics
}
func NewExchange(
fetcher *BlockFetcher,
store *eds.Store,
construct header.ConstructFn,
opts ...Option,
) (*Exchange, error) {
p := defaultParams()
for _, opt := range opts {
opt(&p)
}
var (
metrics *exchangeMetrics
err error
)
if p.metrics {
metrics, err = newExchangeMetrics()
if err != nil {
return nil, err
}
}
return &Exchange{
fetcher: fetcher,
store: store,
construct: construct,
availabilityWindow: p.availabilityWindow,
metrics: metrics,
}, nil
}
func (ce *Exchange) GetByHeight(ctx context.Context, height uint64) (*header.ExtendedHeader, error) {
log.Debugw("requesting header", "height", height)
intHeight := int64(height)
return ce.getExtendedHeaderByHeight(ctx, &intHeight)
}
func (ce *Exchange) GetRangeByHeight(
ctx context.Context,
from *header.ExtendedHeader,
to uint64,
) ([]*header.ExtendedHeader, error) {
start := time.Now()
amount := to - (from.Height() + 1)
headers, err := ce.getRangeByHeight(ctx, from.Height()+1, amount)
if err != nil {
return nil, err
}
ce.metrics.requestDurationPerHeader(ctx, time.Since(start), amount)
for _, h := range headers {
err := libhead.Verify[*header.ExtendedHeader](from, h, libhead.DefaultHeightThreshold)
if err != nil {
return nil, fmt.Errorf("verifying next header against last verified height: %d: %w",
from.Height(), err)
}
from = h
}
return headers, nil
}
func (ce *Exchange) getRangeByHeight(ctx context.Context, from, amount uint64) ([]*header.ExtendedHeader, error) {
if amount == 0 {
return nil, nil
}
log.Debugw("requesting headers", "from", from, "to", from+amount)
headers := make([]*header.ExtendedHeader, amount)
start := time.Now()
errGroup, ctx := errgroup.WithContext(ctx)
errGroup.SetLimit(concurrencyLimit)
for i := range headers {
i := i
errGroup.Go(func() error {
extHeader, err := ce.GetByHeight(ctx, from+uint64(i))
if err != nil {
return err
}
headers[i] = extHeader
return nil
})
}
if err := errGroup.Wait(); err != nil {
return nil, err
}
log.Debugw("received headers", "from", from, "to", from+amount, "after", time.Since(start))
return headers, nil
}
func (ce *Exchange) Get(ctx context.Context, hash libhead.Hash) (*header.ExtendedHeader, error) {
log.Debugw("requesting header", "hash", hash.String())
block, err := ce.fetcher.GetBlockByHash(ctx, hash)
if err != nil {
return nil, fmt.Errorf("fetching block by hash %s: %w", hash.String(), err)
}
comm, vals, err := ce.fetcher.GetBlockInfo(ctx, &block.Height)
if err != nil {
return nil, fmt.Errorf("fetching block info for height %d: %w", &block.Height, err)
}
// extend block data
adder := ipld.NewProofsAdder(int(block.Data.SquareSize))
defer adder.Purge()
eds, err := extendBlock(block.Data, block.Header.Version.App, nmt.NodeVisitor(adder.VisitFn()))
if err != nil {
return nil, fmt.Errorf("extending block data for height %d: %w", &block.Height, err)
}
// construct extended header
eh, err := ce.construct(&block.Header, comm, vals, eds)
if err != nil {
panic(fmt.Errorf("constructing extended header for height %d: %w", &block.Height, err))
}
// verify hashes match
if !bytes.Equal(hash, eh.Hash()) {
return nil, fmt.Errorf("incorrect hash in header at height %d: expected %x, got %x",
&block.Height, hash, eh.Hash())
}
err = storeEDS(ctx, eh, eds, adder, ce.store, ce.availabilityWindow)
if err != nil {
return nil, err
}
return eh, nil
}
func (ce *Exchange) Head(
ctx context.Context,
_ ...libhead.HeadOption[*header.ExtendedHeader],
) (*header.ExtendedHeader, error) {
log.Debug("requesting head")
return ce.getExtendedHeaderByHeight(ctx, nil)
}
func (ce *Exchange) getExtendedHeaderByHeight(ctx context.Context, height *int64) (*header.ExtendedHeader, error) {
b, err := ce.fetcher.GetSignedBlock(ctx, height)
if err != nil {
if height == nil {
return nil, fmt.Errorf("fetching signed block for head from core: %w", err)
}
return nil, fmt.Errorf("fetching signed block at height %d from core: %w", *height, err)
}
log.Debugw("fetched signed block from core", "height", b.Header.Height)
// extend block data
adder := ipld.NewProofsAdder(int(b.Data.SquareSize))
defer adder.Purge()
eds, err := extendBlock(b.Data, b.Header.Version.App, nmt.NodeVisitor(adder.VisitFn()))
if err != nil {
return nil, fmt.Errorf("extending block data for height %d: %w", b.Header.Height, err)
}
// create extended header
eh, err := ce.construct(&b.Header, &b.Commit, &b.ValidatorSet, eds)
if err != nil {
panic(fmt.Errorf("constructing extended header for height %d: %w", b.Header.Height, err))
}
err = storeEDS(ctx, eh, eds, adder, ce.store, ce.availabilityWindow)
if err != nil {
return nil, err
}
return eh, nil
}