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e49d5f89a5ff12faa052d9f33755462e48fe147c
scylladb/thrift/server.cc
Avi Kivity 99ee5f6aac thrift: don't capture structured bindings in lambdas 
Clang does not yet implement p1091r3, which allows lambdas
to capture structured bindings. To accomodate it, don't
use structured bindings for variables that are later
captured.
2020-10-16 15:24:57 +03:00

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/*
* Copyright (C) 2014 ScyllaDB
*/
/*
* This file is part of Scylla.
*
* Scylla 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.
*
* Scylla 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
*/
#include "server.hh"
#include "handler.hh"
#include <seastar/core/future-util.hh>
#include <seastar/core/circular_buffer.hh>
#include <seastar/core/metrics.hh>
#include <seastar/net/byteorder.hh>
#include <seastar/core/scattered_message.hh>
#include <seastar/core/sleep.hh>
#include "log.hh"
#include <thrift/server/TServer.h>
#include <thrift/transport/TBufferTransports.h>
#include <thrift/TProcessor.h>
#include <thrift/protocol/TBinaryProtocol.h>
#include <thrift/async/TAsyncProcessor.h>
#include <iostream>
#include <algorithm>
#include <unordered_map>
#include <queue>
#include <bitset>
#include <limits>
#include <cctype>
#include <vector>
#ifdef THRIFT_USES_BOOST
#include <boost/make_shared.hpp>
#endif
static logging::logger tlogger("thrift");
using namespace apache::thrift;
using namespace apache::thrift::transport;
using namespace apache::thrift::protocol;
using namespace apache::thrift::async;
using namespace ::cassandra;
using namespace std::chrono_literals;
class thrift_stats {
seastar::metrics::metric_groups _metrics;
public:
thrift_stats(thrift_server& server);
};
thrift_server::thrift_server(distributed<database>& db,
distributed<cql3::query_processor>& qp,
auth::service& auth_service,
thrift_server_config config)
: _stats(new thrift_stats(*this))
, _handler_factory(create_handler_factory(db, qp, auth_service, config.timeout_config).release())
, _protocol_factory(new TBinaryProtocolFactoryT<TMemoryBuffer>())
, _processor_factory(new CassandraAsyncProcessorFactory(_handler_factory))
, _config(config) {
}
thrift_server::~thrift_server() {
}
future<> thrift_server::stop() {
auto f = _stop_gate.close();
std::for_each(_listeners.begin(), _listeners.end(), std::mem_fn(&server_socket::abort_accept));
std::for_each(_connections_list.begin(), _connections_list.end(), std::mem_fn(&connection::shutdown));
return f;
}
struct handler_deleter {
CassandraCobSvIfFactory* hf;
void operator()(CassandraCobSvIf* h) const {
hf->releaseHandler(h);
}
};
// thrift uses a shared_ptr to refer to the transport (= connection),
// while we do not, so we can't have connection inherit from TTransport.
struct thrift_server::connection::fake_transport : TTransport {
fake_transport(thrift_server::connection* c) : conn(c) {}
thrift_server::connection* conn;
};
thrift_server::connection::connection(thrift_server& server, connected_socket&& fd, socket_address addr)
: _server(server), _fd(std::move(fd)), _read_buf(_fd.input())
, _write_buf(_fd.output())
, _transport(thrift_std::make_shared<thrift_server::connection::fake_transport>(this))
, _input(thrift_std::make_shared<TMemoryBuffer>())
, _output(thrift_std::make_shared<TMemoryBuffer>())
, _in_proto(_server._protocol_factory->getProtocol(_input))
, _out_proto(_server._protocol_factory->getProtocol(_output))
, _processor(_server._processor_factory->getProcessor({ _in_proto, _out_proto, _transport })) {
++_server._total_connections;
++_server._current_connections;
_server._connections_list.push_back(*this);
}
thrift_server::connection::~connection() {
if (is_linked()) {
--_server._current_connections;
_server._connections_list.erase(_server._connections_list.iterator_to(*this));
}
}
thrift_server::connection::connection(connection&& other)
: _server(other._server)
, _fd(std::move(other._fd))
, _read_buf(std::move(other._read_buf))
, _write_buf(std::move(other._write_buf))
, _transport(std::move(other._transport))
, _input(std::move(other._input))
, _output(std::move(other._output))
, _in_proto(std::move(other._in_proto))
, _out_proto(std::move(other._out_proto))
, _processor(std::move(other._processor)) {
if (other.is_linked()) {
boost::intrusive::list<connection>::node_algorithms::init(this_ptr());
boost::intrusive::list<connection>::node_algorithms::swap_nodes(other.this_ptr(), this_ptr());
}
}
future<>
thrift_server::connection::process() {
return do_until([this] { return _read_buf.eof(); },
[this] { return process_one_request(); })
.finally([this] {
return _write_buf.close();
});
}
future<>
thrift_server::connection::process_one_request() {
_input->resetBuffer();
_output->resetBuffer();
return read().then([this] {
++_server._requests_served;
auto ret = _processor_promise.get_future();
// adapt from "continuation object style" to future/promise
auto complete = [this] (bool success) mutable {
// FIXME: look at success?
write().forward_to(std::move(_processor_promise));
_processor_promise = promise<>();
};
_processor->process(complete, _in_proto, _out_proto);
return ret;
});
}
future<>
thrift_server::connection::read() {
return _read_buf.read_exactly(4).then([this] (temporary_buffer<char> size_buf) {
if (size_buf.size() != 4) {
return make_ready_future<>();
}
union {
uint32_t n;
char b[4];
} data;
std::copy_n(size_buf.get(), 4, data.b);
auto n = ntohl(data.n);
if (n > _server._config.max_request_size) {
// Close connection silently, we can't return a response because we did not
// read a complete frame.
tlogger.info("message size {} exceeds configured maximum {}, closing connection", n, _server._config.max_request_size);
return make_ready_future<>();
}
return _read_buf.read_exactly(n).then([this, n] (temporary_buffer<char> buf) {
if (buf.size() != n) {
// FIXME: exception perhaps?
return;
}
_in_tmp = std::move(buf); // keep ownership of the data
auto b = reinterpret_cast<uint8_t*>(_in_tmp.get_write());
_input->resetBuffer(b, _in_tmp.size());
});
});
}
future<>
thrift_server::connection::write() {
uint8_t* data;
uint32_t len;
_output->getBuffer(&data, &len);
net::packed<uint32_t> plen = { net::hton(len) };
return _write_buf.write(reinterpret_cast<char*>(&plen), 4).then([this, data, len] {
// FIXME: zero-copy
return _write_buf.write(reinterpret_cast<char*>(data), len);
}).then([this] {
return _write_buf.flush();
});
}
void
thrift_server::connection::shutdown() {
try {
_fd.shutdown_input();
_fd.shutdown_output();
} catch (...) {
}
}
future<>
thrift_server::listen(socket_address addr, bool keepalive) {
listen_options lo;
lo.reuse_address = true;
_listeners.push_back(seastar::listen(addr, lo));
do_accepts(_listeners.size() - 1, keepalive);
return make_ready_future<>();
}
void
thrift_server::do_accepts(int which, bool keepalive) {
if (_stop_gate.is_closed()) {
return;
}
// Future is waited on indirectly in `stop()` (via `_stop_gate`).
(void)with_gate(_stop_gate, [&, this] {
return _listeners[which].accept().then([this, which, keepalive] (accept_result ar) {
auto&& fd = ar.connection;
auto&& addr = ar.remote_address;
fd.set_nodelay(true);
fd.set_keepalive(keepalive);
// Future is waited on indirectly in `stop()` (via `_stop_gate`).
(void)with_gate(_stop_gate, [&, this] {
return do_with(connection(*this, std::move(fd), addr), [this] (auto& conn) {
return conn.process().then_wrapped([this, &conn] (future<> f) {
conn.shutdown();
try {
f.get();
} catch (std::exception& ex) {
tlogger.debug("request error {}", ex.what());
}
});
});
});
do_accepts(which, keepalive);
}).handle_exception([this, which, keepalive] (auto ex) {
tlogger.debug("accept failed {}", ex);
this->maybe_retry_accept(which, keepalive, std::move(ex));
});
});
}
void thrift_server::maybe_retry_accept(int which, bool keepalive, std::exception_ptr ex) {
auto retry = [this, which, keepalive] {
tlogger.debug("retrying accept after failure");
do_accepts(which, keepalive);
};
auto retry_with_backoff = [&] {
// FIXME: Consider using exponential backoff
// Done in the background.
(void)sleep(1ms).then([retry = std::move(retry)] { retry(); });
};
try {
std::rethrow_exception(std::move(ex));
} catch (const std::system_error& e) {
switch (e.code().value()) {
// FIXME: Don't retry for other fatal errors
case EBADF:
break;
case ENFILE:
case EMFILE:
case ENOMEM:
retry_with_backoff();
default:
retry();
}
} catch (const std::bad_alloc&) {
retry_with_backoff();
} catch (const seastar::gate_closed_exception&) {
return;
} catch (...) {
retry();
}
}
uint64_t
thrift_server::total_connections() const {
return _total_connections;
}
uint64_t
thrift_server::current_connections() const {
return _current_connections;
}
uint64_t
thrift_server::requests_served() const {
return _requests_served;
}
thrift_stats::thrift_stats(thrift_server& server) {
namespace sm = seastar::metrics;
_metrics.add_group("thrift", {
sm::make_derive("thrift-connections", [&server] { return server.total_connections(); },
sm::description("Rate of creation of new Thrift connections.")),
sm::make_gauge("current_connections", [&server] { return server.current_connections(); },
sm::description("Holds a current number of opened Thrift connections.")),
sm::make_derive("served", [&server] { return server.requests_served(); },
sm::description("Rate of serving Thrift requests.")),
});
}
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