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https://github.com/EvernodeXRPL/hpcore.git
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fabfdcce89
* Forward others' messages only to the weakly connected nodes instead of broadcasting to all the connected peers. * Announcing connected status depends on a threshold to other connected peers. * Forwarding messages of weakly connected peers to other peers.
222 lines
10 KiB
C++
222 lines
10 KiB
C++
#include "../pchheader.hpp"
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#include "../conf.hpp"
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#include "../consensus.hpp"
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#include "../crypto.hpp"
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#include "../util.hpp"
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#include "../hplog.hpp"
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#include "../msg/fbuf/p2pmsg_container_generated.h"
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#include "../msg/fbuf/p2pmsg_content_generated.h"
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#include "../msg/fbuf/p2pmsg_helpers.hpp"
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#include "../msg/fbuf/common_helpers.hpp"
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#include "../comm/comm_session.hpp"
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#include "p2p.hpp"
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#include "peer_session_handler.hpp"
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#include "../state/state_sync.hpp"
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#include "../ledger.hpp"
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namespace p2pmsg = msg::fbuf::p2pmsg;
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namespace p2p
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{
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// The set of recent peer message hashes used for duplicate detection.
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util::rollover_hashset recent_peermsg_hashes(200);
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/**
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* This gets hit every time a peer connects to HP via the peer port (configured in contract config).
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*/
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int peer_session_handler::on_connect(comm::comm_session &session) const
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{
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if (session.is_inbound)
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{
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// Limit max number of inbound connections.
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if (conf::cfg.peermaxcons > 0 && ctx.peer_connections.size() >= conf::cfg.peermaxcons)
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{
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LOG_DEBUG << "Max peer connections reached. Dropped connection " << session.uniqueid.substr(0, 10);
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return -1;
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}
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}
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// Send peer challenge.
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flatbuffers::FlatBufferBuilder fbuf(1024);
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p2pmsg::create_msg_from_peer_challenge(fbuf, session.issued_challenge);
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std::string_view msg = std::string_view(
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reinterpret_cast<const char *>(fbuf.GetBufferPointer()), fbuf.GetSize());
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session.send(msg);
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session.challenge_status = comm::CHALLENGE_ISSUED;
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return 0;
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}
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//peer session on message callback method
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//validate and handle each type of peer messages.
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int peer_session_handler::on_message(comm::comm_session &session, std::string_view message) const
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{
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const p2pmsg::Container *container;
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if (p2pmsg::validate_and_extract_container(&container, message) != 0)
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return 0;
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//Get serialised message content.
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const flatbuffers::Vector<uint8_t> *container_content = container->content();
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//Accessing message content and size.
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const uint8_t *content_ptr = container_content->Data();
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const flatbuffers::uoffset_t content_size = container_content->size();
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const p2pmsg::Content *content;
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if (p2pmsg::validate_and_extract_content(&content, content_ptr, content_size) != 0)
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return 0;
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if (!recent_peermsg_hashes.try_emplace(crypto::get_hash(message)))
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{
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session.increment_metric(comm::SESSION_THRESHOLDS::MAX_DUPMSGS_PER_MINUTE, 1);
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LOG_DEBUG << "Duplicate peer message. " << session.uniqueid.substr(0, 10);
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return 0;
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}
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const p2pmsg::Message content_message_type = content->message_type(); //i.e - proposal, npl, state request, state response, etc
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// Check whether the message is qualified for forwarding.
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if (p2p::validate_for_peer_msg_forwarding(session, container, content_message_type))
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{
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if (session.is_weakly_connected)
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{
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// Forward messages received by weakly connected nodes to other peers.
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p2p::broadcast_message(message, false, false, &session);
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}
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else
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{
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// Forward message received from other nodes to weakly connected peers.
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p2p::broadcast_message(message, false, true, &session);
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}
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}
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if (content_message_type == p2pmsg::Message_Peer_Challenge_Message) // message is a peer challenge announcement
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{
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// Sending the challenge response to the respected peer.
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const std::string challenge = std::string(p2pmsg::get_peer_challenge_from_msg(*content->message_as_Peer_Challenge_Message()));
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flatbuffers::FlatBufferBuilder fbuf(1024);
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p2pmsg::create_peer_challenge_response_from_challenge(fbuf, challenge);
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std::string_view msg = std::string_view(
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reinterpret_cast<const char *>(fbuf.GetBufferPointer()), fbuf.GetSize());
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return session.send(msg);
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}
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if (content_message_type == p2pmsg::Message_Peer_Challenge_Response_Message) // message is a peer challenge response
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{
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// Ignore if challenge is already resolved.
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if (session.challenge_status == comm::CHALLENGE_ISSUED)
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{
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const p2p::peer_challenge_response challenge_resp = p2pmsg::create_peer_challenge_response_from_msg(*content->message_as_Peer_Challenge_Response_Message(), container->pubkey());
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return p2p::resolve_peer_challenge(session, challenge_resp);
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}
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}
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if (session.challenge_status != comm::CHALLENGE_VERIFIED)
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{
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LOG_DEBUG << "Cannot accept messages. Peer challenge unresolved. " << session.uniqueid.substr(0, 10);
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return 0;
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}
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if (content_message_type == p2pmsg::Message_Proposal_Message) // message is a proposal message
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{
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// We only trust proposals coming from trusted peers.
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if (p2pmsg::validate_container_trust(container) != 0)
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{
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session.increment_metric(comm::SESSION_THRESHOLDS::MAX_BADSIGMSGS_PER_MINUTE, 1);
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LOG_DEBUG << "Proposal rejected due to trust failure. " << session.uniqueid.substr(0, 10);
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return 0;
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}
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std::scoped_lock<std::mutex> lock(ctx.collected_msgs.proposals_mutex); // Insert proposal with lock.
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ctx.collected_msgs.proposals.push_back(
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p2pmsg::create_proposal_from_msg(*content->message_as_Proposal_Message(), container->pubkey(), container->timestamp(), container->lcl()));
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}
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else if (content_message_type == p2pmsg::Message_NonUnl_Proposal_Message) //message is a non-unl proposal message
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{
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std::scoped_lock<std::mutex> lock(ctx.collected_msgs.nonunl_proposals_mutex); // Insert non-unl proposal with lock.
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ctx.collected_msgs.nonunl_proposals.push_back(
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p2pmsg::create_nonunl_proposal_from_msg(*content->message_as_NonUnl_Proposal_Message(), container->timestamp()));
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}
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else if (content_message_type == p2pmsg::Message_Npl_Message) //message is a NPL message
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{
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if (p2pmsg::validate_container_trust(container) != 0)
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{
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session.increment_metric(comm::SESSION_THRESHOLDS::MAX_BADSIGMSGS_PER_MINUTE, 1);
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LOG_DEBUG << "NPL message rejected due to trust failure. " << session.uniqueid.substr(0, 10);
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return 0;
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}
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const p2pmsg::Npl_Message *npl_p2p_msg = content->message_as_Npl_Message();
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npl_message msg;
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msg.data = msg::fbuf::flatbuff_bytes_to_sv(npl_p2p_msg->data());
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msg.pubkey = msg::fbuf::flatbuff_bytes_to_sv(container->pubkey());
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msg.lcl = msg::fbuf::flatbuff_bytes_to_sv(container->lcl());
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if (!consensus::push_npl_message(msg))
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{
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LOG_DEBUG << "NPL message enqueue failure. " << session.uniqueid.substr(0, 10);
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}
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}
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else if (content_message_type == p2pmsg::Message_Connected_Status_Announcement_Message) // This message is the connected status announcement message.
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{
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const p2pmsg::Connected_Status_Announcement_Message *announcement_msg = content->message_as_Connected_Status_Announcement_Message();
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session.is_weakly_connected = announcement_msg->is_weakly_connected();
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if (session.is_weakly_connected)
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{
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LOG_DEBUG << "Weakly connected announcement received from " << session.uniqueid.substr(0, 10);
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}
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else
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{
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LOG_DEBUG << "Strongly connected announcement received from " << session.uniqueid.substr(0, 10);
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}
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}
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else if (content_message_type == p2pmsg::Message_State_Request_Message)
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{
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// Insert request with lock.
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std::scoped_lock<std::mutex> lock(ctx.collected_msgs.state_requests_mutex);
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std::string state_request_msg(reinterpret_cast<const char *>(content_ptr), content_size);
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ctx.collected_msgs.state_requests.push_back(std::make_pair(session.uniqueid, std::move(state_request_msg)));
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}
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else if (content_message_type == p2pmsg::Message_State_Response_Message)
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{
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if (state_sync::ctx.is_syncing) // Only accept state responses if state is syncing.
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{
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// Insert state_response with lock.
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std::scoped_lock<std::mutex> lock(ctx.collected_msgs.state_responses_mutex);
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std::string response(reinterpret_cast<const char *>(content_ptr), content_size);
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ctx.collected_msgs.state_responses.push_back(std::move(response));
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}
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}
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else if (content_message_type == p2pmsg::Message_History_Request_Message) //message is a lcl history request message
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{
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const p2p::history_request hr = p2pmsg::create_history_request_from_msg(*content->message_as_History_Request_Message());
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std::scoped_lock<std::mutex> lock(ledger::sync_ctx.list_mutex);
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ledger::sync_ctx.collected_history_requests.push_back(std::make_pair(session.uniqueid, std::move(hr)));
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}
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else if (content_message_type == p2pmsg::Message_History_Response_Message) //message is a lcl history response message
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{
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const p2p::history_response hr = p2pmsg::create_history_response_from_msg(*content->message_as_History_Response_Message());
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std::scoped_lock<std::mutex> lock(ledger::sync_ctx.list_mutex);
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ledger::sync_ctx.collected_history_responses.push_back(std::move(hr));
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}
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else
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{
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session.increment_metric(comm::SESSION_THRESHOLDS::MAX_BADMSGS_PER_MINUTE, 1);
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LOG_DEBUG << "Received invalid peer message type. " << session.uniqueid.substr(0, 10);
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}
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return 0;
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}
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//peer session on message callback method
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void peer_session_handler::on_close(const comm::comm_session &session) const
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{
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// Erase the corresponding uniqueid peer connection if it's this session.
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std::scoped_lock<std::mutex> lock(ctx.peer_connections_mutex);
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const auto itr = ctx.peer_connections.find(session.uniqueid);
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if (itr != ctx.peer_connections.end() && itr->second == &session)
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ctx.peer_connections.erase(itr);
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}
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} // namespace p2p
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