void session_inbound::handle_accept(const code& ec, channel::ptr channel,
acceptor::ptr accept)
{
if (stopped())
{
log::debug(LOG_NETWORK)
<< "Suspended inbound connection.";
return;
}
start_accept(error::success, accept);
if (ec)
{
log::debug(LOG_NETWORK)
<< "Failure accepting connection: " << ec.message();
return;
}
if (blacklisted(channel->authority()))
{
log::debug(LOG_NETWORK)
<< "Rejected inbound connection from ["
<< channel->authority() << "] due to blacklisted address.";
return;
}
connection_count(BIND2(handle_connection_count, _1, channel));
}
void session_inbound::handle_accept(const code& ec, channel::ptr channel,
acceptor::ptr accept)
{
if (stopped())
return;
start_accept(error::success, accept);
if (ec)
{
log::debug(LOG_NETWORK)
<< "Failure accepting connection: " << ec.message();
return;
}
if (blacklisted(channel->authority()))
{
log::debug(LOG_NETWORK)
<< "Rejected inbound connection from ["
<< channel->authority() << "] due to blacklisted address.";
return;
}
connection_count(
dispatch_.ordered_delegate(&session_inbound::handle_connection_count,
shared_from_base<session_inbound>(), _1, channel));
}
void responder::send_pool_tx(const code& ec, const transaction& tx,
const hash_digest& tx_hash, channel::ptr node)
{
if (ec == error::service_stopped)
return;
if (ec == error::not_found)
{
log::debug(LOG_RESPONDER)
<< "Transaction for [" << node->authority()
<< "] not in mempool [" << encode_hash(tx_hash) << "]";
// It wasn't in the mempool, so relay the request to the blockchain.
blockchain_.fetch_transaction(tx_hash,
std::bind(&responder::send_chain_tx,
this, _1, _2, tx_hash, node));
return;
}
if (ec)
{
log::error(LOG_RESPONDER)
<< "Failure fetching mempool tx data for ["
<< node->authority() << "] " << ec.message();
node->stop(ec);
return;
}
send_tx(tx, tx_hash, node);
}
void session::handle_is_pending(bool pending, channel::ptr channel,
result_handler handle_started)
{
if (pending)
{
log::debug(LOG_NETWORK)
<< "Rejected connection from [" << channel->authority()
<< "] as loopback.";
handle_started(error::accept_failed);
return;
}
const auto version = channel->version();
if (version.value < bc::peer_minimum_version)
{
log::debug(LOG_NETWORK)
<< "Peer version (" << version.value << ") below minimum ("
<< bc::peer_minimum_version << ") ["
<< channel->authority() << "]";
handle_started(error::accept_failed);
return;
}
network_.store(channel, handle_started);
}
// en.bitcoin.it/wiki/Protocol_documentation#getdata
// getdata can be used to retrieve transactions, but only if they are
// in the memory pool or relay set - arbitrary access to transactions
// in the chain is not allowed to avoid having clients start to depend
// on nodes having full transaction indexes (which modern nodes do not).
void responder::send_chain_tx(const code& ec, const transaction& tx,
const hash_digest& tx_hash, channel::ptr node)
{
if (ec == error::service_stopped)
return;
if (ec == error::not_found)
{
log::debug(LOG_RESPONDER)
<< "Transaction for [" << node->authority()
<< "] not in blockchain [" << encode_hash(tx_hash) << "]";
// It wasn't in the blockchain, so send notfound.
send_tx_not_found(tx_hash, node);
return;
}
if (ec)
{
log::error(LOG_RESPONDER)
<< "Failure fetching blockchain tx data for ["
<< node->authority() << "] " << ec.message();
node->stop(ec);
return;
}
send_tx(tx, tx_hash, node);
}
void session_manual::handle_connect(const code& ec, channel::ptr channel,
const std::string& hostname, uint16_t port, uint32_t remaining,
connector::ptr connector, channel_handler handler)
{
unpend(connector);
if (ec)
{
LOG_WARNING(LOG_NETWORK)
<< "Failure connecting [" << config::endpoint(hostname, port)
<< "] manually: " << ec.message();
// Retry logic.
// The handler invoke is the failure end of the connect sequence.
if (settings_.manual_attempt_limit == 0)
start_connect(hostname, port, 0, handler);
else if (remaining > 0)
start_connect(hostname, port, remaining - 1, handler);
else
handler(ec, nullptr);
return;
}
LOG_INFO(LOG_NETWORK)
<< "Connected manual channel [" << config::endpoint(hostname, port)
<< "] as [" << channel->authority() << "]";
register_channel(channel,
BIND5(handle_channel_start, _1, hostname, port, channel, handler),
BIND3(handle_channel_stop, _1, hostname, port));
}
// We don't seem to be getting getdata requests.
void responder::receive_get_data(const code& ec, const get_data& packet,
channel::ptr node)
{
if (ec == error::channel_stopped)
return;
const auto peer = node->authority();
if (ec)
{
log::debug(LOG_RESPONDER)
<< "Failure in receive get data [" << peer << "] " << ec.message();
node->stop(ec);
return;
}
// Resubscribe to serve tx and blocks.
node->subscribe<message::get_data>(
std::bind(&responder::receive_get_data,
this, _1, _2, node));
log::debug(LOG_RESPONDER)
<< "Getdata BEGIN [" << peer << "] "
<< "txs (" << packet.count(inventory_type_id::transaction) << ") "
<< "blocks (" << packet.count(inventory_type_id::block) << ") "
<< "bloom (" << packet.count(inventory_type_id::filtered_block) << ")";
for (const auto& inventory: packet.inventories)
{
switch (inventory.type)
{
case inventory_type_id::transaction:
log::debug(LOG_RESPONDER)
<< "Transaction getdata for [" << peer << "] "
<< encode_hash(inventory.hash);
tx_pool_.fetch(inventory.hash,
std::bind(&responder::send_pool_tx,
this, _1, _2, inventory.hash, node));
break;
case inventory_type_id::block:
log::debug(LOG_RESPONDER)
<< "Block getdata for [" << peer << "] "
<< encode_hash(inventory.hash);
block_fetcher::fetch(blockchain_, inventory.hash,
std::bind(&responder::send_block,
this, _1, _2, inventory.hash, node));
break;
case inventory_type_id::error:
case inventory_type_id::none:
default:
log::debug(LOG_RESPONDER)
<< "Ignoring invalid getdata type for [" << peer << "]";
}
}
log::debug(LOG_RESPONDER)
<< "Getdata END [" << peer << "]";
}
void session_manual::handle_connect(const code& ec, channel::ptr channel,
const std::string& hostname, uint16_t port, channel_handler handler,
uint16_t retries)
{
if (ec)
{
log::warning(LOG_NETWORK)
<< "Failure connecting [" << config::endpoint(hostname, port)
<< "] manually: " << ec.message();
// Retry logic.
if (settings_.connect_attempts == 0)
start_connect(hostname, port, handler, 0);
else if (retries > 0)
start_connect(hostname, port, handler, retries - 1);
else
handler(ec, nullptr);
return;
}
log::info(LOG_NETWORK)
<< "Connected manual channel [" << config::endpoint(hostname, port)
<< "] as [" << channel->authority() << "]";
register_channel(channel,
std::bind(&session_manual::handle_channel_start,
shared_from_base<session_manual>(), _1, hostname, port, channel, handler),
std::bind(&session_manual::handle_channel_stop,
shared_from_base<session_manual>(), _1, hostname, port));
}
void session::handle_remove(const code& ec, channel::ptr channel)
{
if (ec)
LOG_DEBUG(LOG_NETWORK)
<< "Failed to remove channel [" << channel->authority() << "] "
<< ec.message();
}
void responder::send_tx(const transaction& tx, const hash_digest& hash,
channel::ptr node)
{
const auto send_handler = [hash, node](const code& ec)
{
if (ec)
log::debug(LOG_RESPONDER)
<< "Failure sending tx for ["
<< node->authority() << "]";
else
log::debug(LOG_RESPONDER)
<< "Sent tx for [" << node->authority()
<< "] " << encode_hash(hash);
};
node->send(tx, send_handler);
}
void responder::send_tx_not_found(const hash_digest& hash, channel::ptr node)
{
const auto send_handler = [hash, node](const code& ec)
{
if (ec)
log::debug(LOG_RESPONDER)
<< "Failure sending tx notfound for ["
<< node->authority() << "]";
else
log::debug(LOG_RESPONDER)
<< "Sent tx notfound for [" << node->authority()
<< "] " << encode_hash(hash);
};
send_inventory_not_found(inventory_type_id::transaction, hash, node,
send_handler);
}
void responder::send_block_not_found(const hash_digest& block_hash,
channel::ptr node)
{
const auto send_handler = [block_hash, node](const code& ec)
{
if (ec)
log::debug(LOG_RESPONDER)
<< "Failure sending block notfound for ["
<< node->authority() << "]";
else
log::debug(LOG_RESPONDER)
<< "Sent block notfound for [" << node->authority()
<< "] " << encode_hash(block_hash);
};
send_inventory_not_found(inventory_type_id::block, block_hash,
node, send_handler);
}
void session_outbound::handle_channel_stop(const code& ec,
connector::ptr connect, channel::ptr channel)
{
log::debug(LOG_NETWORK)
<< "Outbound channel stopped [" << channel->authority() << "] "
<< ec.message();
new_connection(connect);
}
void session_inbound::handle_connection_count(size_t connections,
channel::ptr channel)
{
if (connections >= settings_.inbound_connection_limit)
{
log::debug(LOG_NETWORK)
<< "Rejected inbound connection from ["
<< channel->authority() << "] due to connection limit.";
return;
}
log::info(LOG_NETWORK)
<< "Connected inbound channel [" << channel->authority() << "]";
register_channel(channel,
std::bind(&session_inbound::handle_channel_start,
shared_from_base<session_inbound>(), _1, channel),
std::bind(&session_inbound::handle_channel_stop,
shared_from_base<session_inbound>(), _1));
}
void session_inbound::handle_connection_count(size_t connections,
channel::ptr channel)
{
const auto connection_limit = settings_.inbound_connections +
settings_.outbound_connections;
if (connections >= connection_limit)
{
log::debug(LOG_NETWORK)
<< "Rejected inbound connection from ["
<< channel->authority() << "] due to connection limit.";
return;
}
log::info(LOG_NETWORK)
<< "Connected inbound channel [" << channel->authority() << "]";
register_channel(channel,
BIND2(handle_channel_start, _1, channel),
BIND1(handle_channel_stop, _1));
}
void session_inbound::handle_channel_start(const code& ec,
channel::ptr channel)
{
if (ec)
{
LOG_INFO(LOG_NETWORK)
<< "Inbound channel failed to start [" << channel->authority()
<< "] " << ec.message();
return;
}
attach_protocols(channel);
};
// Should we look in the orphan pool first?
void responder::send_block(const code& ec, const block& block,
const hash_digest& block_hash, channel::ptr node)
{
if (ec == error::service_stopped)
return;
if (ec == error::not_found)
{
log::debug(LOG_RESPONDER)
<< "Block for [" << node->authority()
<< "] not in blockchain [" << encode_hash(block_hash) << "]";
// It wasn't in the blockchain, so send notfound.
send_block_not_found(block_hash, node);
}
if (ec)
{
log::error(LOG_RESPONDER)
<< "Failure fetching block data for ["
<< node->authority() << "] " << ec.message();
node->stop(ec);
return;
}
const auto send_handler = [block_hash, node](const code& ec)
{
if (ec)
log::debug(LOG_RESPONDER)
<< "Failure sending block for ["
<< node->authority() << "]";
else
log::debug(LOG_RESPONDER)
<< "Sent block for [" << node->authority()
<< "] " << encode_hash(block_hash);
};
node->send(block, send_handler);
}
void session_inbound::handle_is_pending(bool pending, channel::ptr channel,
result_handler handle_started)
{
if (pending)
{
LOG_DEBUG(LOG_NETWORK)
<< "Rejected connection from [" << channel->authority()
<< "] as loopback.";
handle_started(error::accept_failed);
return;
}
session::start_channel(channel, handle_started);
}
void session_inbound::handle_channel_start(const code& ec,
channel::ptr channel)
{
if (ec)
{
log::info(LOG_NETWORK)
<< "Inbound channel failed to start [" << channel->authority()
<< "] " << ec.message();
return;
}
attach<protocol_ping>(channel)->start();
attach<protocol_address>(channel)->start();
}
void session::handle_starting(const code& ec, channel::ptr channel,
result_handler handle_started)
{
if (ec)
{
LOG_INFO(LOG_NETWORK)
<< "Channel failed to start [" << channel->authority() << "] "
<< ec.message();
handle_started(ec);
return;
}
attach_handshake_protocols(channel,
BIND_3(handle_handshake, _1, channel, handle_started));
}
void session::handle_handshake(const code& ec, channel::ptr channel,
result_handler handle_started)
{
if (ec)
{
LOG_DEBUG(LOG_NETWORK)
<< "Failure in handshake with [" << channel->authority()
<< "] " << ec.message();
handle_started(ec);
return;
}
// This will fail if the IP address or nonce is already connected.
network_.store(channel, handle_started);
}
code p2p::store(channel::ptr channel)
{
const auto address = channel->authority();
const auto match = [&address](const channel::ptr& element)
{
return element->authority() == address;
};
// May return error::address_in_use.
const auto ec = pending_close_.store(channel, match);
if (!ec && channel->notify())
channel_subscriber_->relay(error::success, channel);
return ec;
}
void session_outbound::handle_channel_start(const code& ec,
connector::ptr connect, channel::ptr channel)
{
// Treat a start failure just like a stop.
if (ec)
{
log::debug(LOG_NETWORK)
<< "Outbound channel failed to start ["
<< channel->authority() << "] " << ec.message();
new_connection(connect);
return;
}
attach_protocols(channel);
};
// It is common for no connections, one connection or multiple connections to
// succeed, but only zero or one will reach this point. Other connections that
// succeed fall out of scope causing the socket to close on destruct.
void session_batch::handle_connect(const code& ec, channel::ptr channel,
channel_handler handler)
{
if (ec)
{
LOG_DEBUG(LOG_NETWORK)
<< "Failed to connect after (" << batch_size_
<< ") concurrent attempts: " << ec.message();
handler(ec, nullptr);
return;
}
LOG_DEBUG(LOG_NETWORK)
<< "Connected to [" << channel->authority() << "]";
// This is the end of the connect sequence.
handler(error::success, channel);
}
void session_outbound::handle_connect(const code& ec, channel::ptr channel,
connector::ptr connect)
{
if (ec)
{
log::debug(LOG_NETWORK)
<< "Failure connecting outbound: " << ec.message();
new_connection(connect);
return;
}
log::info(LOG_NETWORK)
<< "Connected to outbound channel [" << channel->authority() << "]";
register_channel(channel,
BIND3(handle_channel_start, _1, connect, channel),
BIND3(handle_channel_stop, _1, connect, channel));
}
void session_manual::handle_channel_start(const code& ec,
const std::string& hostname, uint16_t port, channel::ptr channel,
channel_handler handler)
{
// The start failure is also caught by handle_channel_stop.
// Treat a start failure like a stop, but preserve the start handler.
if (ec)
{
LOG_INFO(LOG_NETWORK)
<< "Manual channel failed to start [" << channel->authority()
<< "] " << ec.message();
return;
}
// This is the success end of the connect sequence.
handler(error::success, channel);
attach_protocols(channel);
};
void session::handle_handshake(const code& ec, channel::ptr channel,
result_handler handle_started)
{
if (ec)
{
log::debug(LOG_NETWORK)
<< "Failure in handshake with [" << channel->authority()
<< "] " << ec.message();
handle_started(ec);
return;
}
truth_handler handler =
BIND_3(handle_is_pending, _1, channel, handle_started);
// The loopback test is for incoming channels only.
if (incoming_)
pending_.exists(channel->version().nonce, handler);
else
handler(false);
}
void session_outbound::handle_connect(const code& ec, channel::ptr channel,
const authority& host, connector::ptr connect)
{
if (ec)
{
log::debug(LOG_NETWORK)
<< "Failure connecting [" << host << "] outbound: "
<< ec.message();
new_connection(connect);
return;
}
log::info(LOG_NETWORK)
<< "Connected to outbound channel [" << channel->authority() << "]";
register_channel(channel,
std::bind(&session_outbound::handle_channel_start,
shared_from_base<session_outbound>(), _1, connect, channel),
std::bind(&session_outbound::handle_channel_stop,
shared_from_base<session_outbound>(), _1, connect));
}
void session_batch::handle_connect(const code& ec, channel::ptr channel,
const authority& host, connector::ptr connect, atomic_counter_ptr counter,
channel_handler handler)
{
if (counter->load() == batch_size_)
return;
if (ec)
{
log::debug(LOG_NETWORK)
<< "Failure connecting to [" << host << "] "
<< ec.message();
handler(ec, nullptr);
return;
}
log::debug(LOG_NETWORK)
<< "Connected to [" << channel->authority() << "]";
// This is the end of the connect sequence.
handler(error::success, channel);
}