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// Copyright (C) 2019-2023 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package rpcs
import (
"context"
"encoding/base64"
"fmt"
"io"
"math/rand"
"net/http"
"net/url"
"path"
"strings"
"github.com/algorand/go-algorand/data/bookkeeping"
"github.com/algorand/go-algorand/data/transactions"
"github.com/algorand/go-algorand/logging"
"github.com/algorand/go-algorand/network"
"github.com/algorand/go-algorand/protocol"
"github.com/algorand/go-algorand/util/bloom"
)
// HTTPTxSync implements the TxSyncClient interface over HTTP
type HTTPTxSync struct {
rootURL string
peers network.GossipNode
log logging.Logger
maxTxSyncResponseBytes uint64
}
const requestContentType = "application/x-www-form-urlencoded"
const baseResponseReadingBufferSize = uint64(1024)
// ResponseBytes reads the content of the response object and return the body content
// while obeying the read size limits
func ResponseBytes(response *http.Response, log logging.Logger, limit uint64) (data []byte, err error) {
// response.Body is always non-nil
defer response.Body.Close()
if response.ContentLength >= 0 {
if uint64(response.ContentLength) > limit {
log.Errorf("response too large: %d > %d", response.ContentLength, limit)
return nil, network.ErrIncomingMsgTooLarge
}
data = make([]byte, response.ContentLength)
_, err = io.ReadFull(response.Body, data)
return
}
slurper := network.MakeLimitedReaderSlurper(baseResponseReadingBufferSize, limit)
err = slurper.Read(response.Body)
if err == network.ErrIncomingMsgTooLarge {
log.Errorf("response too large: %d > %d", slurper.Size(), limit)
}
if err != nil {
return nil, err
}
return slurper.Bytes(), err
}
// create a new http sync object.
func makeHTTPSync(peerSource network.GossipNode, log logging.Logger, serverResponseSize uint64) *HTTPTxSync {
const transactionArrayEncodingOverhead = uint64(16) // manual tests shown that the actual extra packing cost is typically 3 bytes. We'll take 16 byte to ensure we're on the safe side.
return &HTTPTxSync{
peers: peerSource,
log: log,
maxTxSyncResponseBytes: serverResponseSize + transactionArrayEncodingOverhead,
}
}
// Sync gets pending transactions from a random peer.
// Part of TxSyncClient interface.
func (hts *HTTPTxSync) Sync(ctx context.Context, bloom *bloom.Filter) (txgroups [][]transactions.SignedTxn, err error) {
bloomBytes, err := bloom.MarshalBinary()
if err != nil {
hts.log.Errorf("txSync could not encode bloom filter: %s", err)
return nil, err
}
bloomParam := base64.URLEncoding.EncodeToString(bloomBytes)
peers := hts.peers.GetPeers(network.PeersPhonebookRelays)
if len(peers) == 0 {
return nil, nil //errors.New("no peers to tx sync from")
}
peer := peers[rand.Intn(len(peers))]
hpeer, ok := peer.(network.HTTPPeer)
if !ok {
return nil, fmt.Errorf("cannot HTTPTxSync non http peer %T %#v", peer, peer)
}
hts.rootURL = hpeer.GetAddress()
client := hpeer.GetHTTPClient()
if client == nil {
client = &http.Client{}
client.Transport = hts.peers.GetRoundTripper()
}
parsedURL, err := network.ParseHostOrURL(hts.rootURL)
if err != nil {
hts.log.Warnf("txSync bad url %v: %s", hts.rootURL, err)
return nil, err
}
parsedURL.Path = hts.peers.SubstituteGenesisID(path.Join(parsedURL.Path, TxServiceHTTPPath))
syncURL := parsedURL.String()
hts.log.Infof("http sync from %s", syncURL)
params := url.Values{}
params.Set("bf", bloomParam)
request, err := http.NewRequest("POST", syncURL, strings.NewReader(params.Encode()))
if err != nil {
hts.log.Errorf("txSync POST setup %v: %s", syncURL, err)
return nil, err
}
request.Header.Set("Content-Type", requestContentType)
network.SetUserAgentHeader(request.Header)
request = request.WithContext(ctx)
response, err := client.Do(request)
if err != nil {
hts.log.Warnf("txSync POST %v: %s", syncURL, err)
return nil, err
}
// check to see that we had no errors.
switch response.StatusCode {
case http.StatusOK:
case http.StatusNoContent: // server has no transactions for us.
response.Body.Close()
return [][]transactions.SignedTxn{}, nil
default:
hts.log.Warn("txSync response status code : ", response.StatusCode)
response.Body.Close()
return nil, fmt.Errorf("txSync POST error response status code %d for '%s'. Request bloom filter length was %d bytes", response.StatusCode, syncURL, len(bloomParam))
}
// at this point, we've already receieved the response headers. ensure that the
// response content type is what we'd like it to be.
contentTypes := response.Header["Content-Type"]
if len(contentTypes) != 1 {
err = fmt.Errorf("txSync POST invalid content type count %d", len(contentTypes))
hts.log.Warn(err)
response.Body.Close()
return nil, err
}
// TODO: Temporarily allow old and new content types so we have time for lazy upgrades
// Remove this 'old' string after next release.
const responseContentTypeOld = "application/x-algorand-ptx-v1"
if contentTypes[0] != responseContentType && contentTypes[0] != responseContentTypeOld {
hts.log.Warnf("http response has an invalid content type : %s", contentTypes[0])
response.Body.Close()
return nil, fmt.Errorf("txSync POST invalid content type '%s'", contentTypes[0])
}
data, err := ResponseBytes(response, hts.log, hts.maxTxSyncResponseBytes)
if err != nil {
hts.log.Warn("txSync body read failed: ", err)
return nil, err
}
hts.log.Debugf("http sync got %d bytes", len(data))
var txns []transactions.SignedTxn
err = protocol.DecodeReflect(data, &txns)
if err != nil {
hts.log.Warn("txSync protocol decode: ", err)
}
return bookkeeping.SignedTxnsToGroups(txns), err
}
// Address is part of TxSyncClient interface.
// Returns the root URL of the connected peer.
func (hts *HTTPTxSync) Address() string {
return hts.rootURL
}
// Close is part of TxSyncClient interface
//
// Does nothing, leaves underlying client open because other HTTP
// requests from other interfaces could be open on it. Somewhere a
// Peer owns that connection and will close as needed.
func (hts *HTTPTxSync) Close() error {
return nil
}
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