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f996ea202a899efe7311d78481bdc3c337af22bd
scylladb/transport/server.cc
Avi Kivity 2b4eaf83ab transport: set TCP_NODELAY 
Reduces latency.
2015-08-18 15:48:36 +03:00

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/*
* Copyright 2015 Cloudius Systems
*/
#include "server.hh"
#include <boost/bimap/unordered_set_of.hpp>
#include <boost/range/irange.hpp>
#include <boost/bimap.hpp>
#include <boost/assign.hpp>
#include <boost/locale/encoding_utf.hpp>
#include <boost/range/adaptor/sliced.hpp>
#include "service/migration_manager.hh"
#include "service/storage_service.hh"
#include "db/consistency_level.hh"
#include "db/write_type.hh"
#include "core/future-util.hh"
#include "core/reactor.hh"
#include "utils/UUID.hh"
#include "database.hh"
#include "net/byteorder.hh"
#include <seastar/core/scollectd.hh>
#include "enum_set.hh"
#include "service/query_state.hh"
#include "service/client_state.hh"
#include "exceptions/exceptions.hh"
#include <cassert>
#include <string>
namespace transport {
static logging::logger logger("cql_server");
struct cql_frame_error : std::exception {
const char* what() const throw () override {
return "bad cql binary frame";
}
};
enum class cql_binary_opcode : uint8_t {
ERROR = 0,
STARTUP = 1,
READY = 2,
AUTHENTICATE = 3,
CREDENTIALS = 4,
OPTIONS = 5,
SUPPORTED = 6,
QUERY = 7,
RESULT = 8,
PREPARE = 9,
EXECUTE = 10,
REGISTER = 11,
EVENT = 12,
BATCH = 13,
AUTH_CHALLENGE = 14,
AUTH_RESPONSE = 15,
AUTH_SUCCESS = 16,
};
inline db::consistency_level wire_to_consistency(int16_t v)
{
switch (v) {
case 0x0000: return db::consistency_level::ANY;
case 0x0001: return db::consistency_level::ONE;
case 0x0002: return db::consistency_level::TWO;
case 0x0003: return db::consistency_level::THREE;
case 0x0004: return db::consistency_level::QUORUM;
case 0x0005: return db::consistency_level::ALL;
case 0x0006: return db::consistency_level::LOCAL_QUORUM;
case 0x0007: return db::consistency_level::EACH_QUORUM;
case 0x0008: return db::consistency_level::SERIAL;
case 0x0009: return db::consistency_level::LOCAL_SERIAL;
case 0x000A: return db::consistency_level::LOCAL_ONE;
default: throw exceptions::protocol_exception(sprint("Unknown code %d for a consistency level", v));
}
}
inline int16_t consistency_to_wire(db::consistency_level c)
{
switch (c) {
case db::consistency_level::ANY: return 0x0000;
case db::consistency_level::ONE: return 0x0001;
case db::consistency_level::TWO: return 0x0002;
case db::consistency_level::THREE: return 0x0003;
case db::consistency_level::QUORUM: return 0x0004;
case db::consistency_level::ALL: return 0x0005;
case db::consistency_level::LOCAL_QUORUM: return 0x0006;
case db::consistency_level::EACH_QUORUM: return 0x0007;
case db::consistency_level::SERIAL: return 0x0008;
case db::consistency_level::LOCAL_SERIAL: return 0x0009;
case db::consistency_level::LOCAL_ONE: return 0x000A;
default: throw std::runtime_error("Invalid consistency level");
}
}
sstring to_string(const event::topology_change::change_type t) {
using type = event::topology_change::change_type;
switch (t) {
case type::NEW_NODE: return "NEW_NODE";
case type::REMOVED_NODE: return "REMOVED_NODE";
case type::MOVED_NODE: return "MOVED_NODE";
}
throw std::invalid_argument("unknown change type");
}
sstring to_string(const event::status_change::status_type t) {
using type = event::status_change::status_type;
switch (t) {
case type::UP: return "NEW_NODE";
case type::DOWN: return "REMOVED_NODE";
}
throw std::invalid_argument("unknown change type");
}
sstring to_string(const event::schema_change::change_type t) {
switch (t) {
case event::schema_change::change_type::CREATED: return "CREATED";
case event::schema_change::change_type::UPDATED: return "UPDATED";
case event::schema_change::change_type::DROPPED: return "DROPPED";
}
throw std::invalid_argument("unknown change type");
}
sstring to_string(const event::schema_change::target_type t) {
switch (t) {
case event::schema_change::target_type::KEYSPACE: return "KEYSPACE";
case event::schema_change::target_type::TABLE: return "TABLE";
case event::schema_change::target_type::TYPE: return "TYPE";
}
throw std::invalid_argument("unknown target type");
}
event::event_type parse_event_type(const sstring& value)
{
if (value == "TOPOLOGY_CHANGE") {
return event::event_type::TOPOLOGY_CHANGE;
} else if (value == "STATUS_CHANGE") {
return event::event_type::STATUS_CHANGE;
} else if (value == "SCHEMA_CHANGE") {
return event::event_type::SCHEMA_CHANGE;
} else {
throw exceptions::protocol_exception(sprint("Invalid value '%s' for Event.Type", value));
}
}
class cql_server::response {
int16_t _stream;
cql_binary_opcode _opcode;
std::vector<char> _body;
public:
response(int16_t stream, cql_binary_opcode opcode)
: _stream{stream}
, _opcode{opcode}
{ }
scattered_message<char> make_message(uint8_t version);
void write_byte(uint8_t b);
void write_int(int32_t n);
void write_long(int64_t n);
void write_short(int16_t n);
void write_string(const sstring& s);
void write_long_string(const sstring& s);
void write_uuid(utils::UUID uuid);
void write_string_list(std::vector<sstring> string_list);
void write_bytes(bytes b);
void write_short_bytes(bytes b);
void write_option(std::pair<int16_t, boost::any> opt);
void write_option_list(std::vector<std::pair<int16_t, boost::any>> opt_list);
void write_inet(ipv4_addr inet);
void write_consistency(db::consistency_level c);
void write_string_map(std::map<sstring, sstring> string_map);
void write_string_multimap(std::multimap<sstring, sstring> string_map);
void write_value(bytes_opt value);
void write(const cql3::metadata& m);
private:
sstring make_frame(uint8_t version, size_t length);
};
cql_server::cql_server(distributed<service::storage_proxy>& proxy, distributed<cql3::query_processor>& qp)
: _proxy(proxy)
, _query_processor(qp)
, _collectd_registrations(std::make_unique<scollectd::registrations>(setup_collectd()))
{
}
scollectd::registrations
cql_server::setup_collectd() {
return {
scollectd::add_polled_metric(
scollectd::type_instance_id("transport", scollectd::per_cpu_plugin_instance,
"connections", "cql-connections"),
scollectd::make_typed(scollectd::data_type::DERIVE, _connects)),
scollectd::add_polled_metric(
scollectd::type_instance_id("transport", scollectd::per_cpu_plugin_instance,
"current_connections", "current"),
scollectd::make_typed(scollectd::data_type::GAUGE, _connections)),
scollectd::add_polled_metric(
scollectd::type_instance_id("transport", scollectd::per_cpu_plugin_instance,
"total_requests", "requests_served"),
scollectd::make_typed(scollectd::data_type::DERIVE, _requests_served)),
scollectd::add_polled_metric(
scollectd::type_instance_id("transport", scollectd::per_cpu_plugin_instance,
"queue_length", "requests_serving"),
scollectd::make_typed(scollectd::data_type::GAUGE, _requests_serving)),
};
}
future<> cql_server::stop() {
service::get_local_storage_service().unregister_subscriber(_notifier.get());
service::get_local_migration_manager().unregister_listener(_notifier.get());
return make_ready_future<>();
}
future<>
cql_server::listen(ipv4_addr addr) {
_notifier = std::make_unique<event_notifier>(addr.port);
service::get_local_migration_manager().register_listener(_notifier.get());
service::get_local_storage_service().register_subscriber(_notifier.get());
listen_options lo;
lo.reuse_address = true;
_listeners.push_back(engine().listen(make_ipv4_address(addr), lo));
do_accepts(_listeners.size() - 1);
return make_ready_future<>();
}
void
cql_server::do_accepts(int which) {
_listeners[which].accept().then([this, which] (connected_socket fd, socket_address addr) mutable {
fd.set_nodelay(true);
auto conn = make_shared<connection>(*this, std::move(fd), addr);
++_connects;
++_connections;
conn->process().then_wrapped([this, conn] (future<> f) {
--_connections;
try {
f.get();
} catch (std::exception& ex) {
logger.debug("connection error: {}", ex.what());
}
});
do_accepts(which);
}).then_wrapped([] (future<> f) {
try {
f.get();
} catch (std::exception& ex) {
logger.debug("accept failed: {}", ex.what());
}
});
}
unsigned
cql_server::connection::frame_size() const {
if (_version < 3) {
return 8;
} else {
return 9;
}
}
cql_binary_frame_v3
cql_server::connection::parse_frame(temporary_buffer<char> buf) {
if (buf.size() != frame_size()) {
throw cql_frame_error();
}
cql_binary_frame_v3 v3;
switch (_version) {
case 1:
case 2: {
auto raw = reinterpret_cast<const cql_binary_frame_v1*>(buf.get());
auto cooked = net::ntoh(*raw);
v3.version = cooked.version;
v3.flags = cooked.flags;
v3.opcode = cooked.opcode;
v3.stream = cooked.stream;
v3.length = cooked.length;
break;
}
case 3:
case 4: {
v3 = net::ntoh(*reinterpret_cast<const cql_binary_frame_v3*>(buf.get()));
break;
}
default:
throw exceptions::protocol_exception(sprint("Invalid or unsupported protocol version: %d", _version));
}
if (v3.version != _version) {
throw exceptions::protocol_exception(sprint("Invalid message version. Got %d but previous messages on this connection had version %d", v3.version, _version));
}
return v3;
}
future<std::experimental::optional<cql_binary_frame_v3>>
cql_server::connection::read_frame() {
using ret_type = std::experimental::optional<cql_binary_frame_v3>;
if (!_version) {
// We don't know the frame size before reading the first frame,
// so read just one byte, and then read the rest of the frame.
return _read_buf.read_exactly(1).then([this] (temporary_buffer<char> buf) {
if (buf.empty()) {
return make_ready_future<ret_type>();
}
_version = buf[0];
init_serialization_format();
if (_version < 1 || _version > current_version) {
throw exceptions::protocol_exception(sprint("Invalid or unsupported protocol version: %d", _version));
}
return _read_buf.read_exactly(frame_size() - 1).then([this] (temporary_buffer<char> tail) {
temporary_buffer<char> full(frame_size());
full.get_write()[0] = _version;
std::copy(tail.get(), tail.get() + tail.size(), full.get_write() + 1);
return make_ready_future<ret_type>(parse_frame(std::move(full)));
});
});
} else {
// Not the first frame, so we know the size.
return _read_buf.read_exactly(frame_size()).then([this] (temporary_buffer<char> buf) {
if (buf.empty()) {
return make_ready_future<ret_type>();
}
return make_ready_future<ret_type>(parse_frame(std::move(buf)));
});
}
}
future<> cql_server::connection::process_request_one(temporary_buffer<char> buf,
uint8_t op,
uint16_t stream) {
return make_ready_future<>().then([this, op, stream, buf = std::move(buf)] () mutable {
switch (static_cast<cql_binary_opcode>(op)) {
case cql_binary_opcode::STARTUP: return process_startup(stream, std::move(buf));
case cql_binary_opcode::AUTH_RESPONSE: return process_auth_response(stream, std::move(buf));
case cql_binary_opcode::OPTIONS: return process_options(stream, std::move(buf));
case cql_binary_opcode::QUERY: return process_query(stream, std::move(buf));
case cql_binary_opcode::PREPARE: return process_prepare(stream, std::move(buf));
case cql_binary_opcode::EXECUTE: return process_execute(stream, std::move(buf));
case cql_binary_opcode::BATCH: return process_batch(stream, std::move(buf));
case cql_binary_opcode::REGISTER: return process_register(stream, std::move(buf));
default: throw exceptions::protocol_exception(sprint("Unknown opcode %d", op));
}
}).then_wrapped([stream, this] (future<> f) {
--_server._requests_serving;
try {
f.get();
return make_ready_future<>();
} catch (const exceptions::unavailable_exception& ex) {
return write_unavailable_error(stream, ex.code(), ex.what(), ex.consistency, ex.required, ex.alive);
} catch (const exceptions::read_timeout_exception& ex) {
return write_read_timeout_error(stream, ex.code(), ex.what(), ex.consistency, ex.received, ex.block_for, ex.data_present);
} catch (const exceptions::mutation_write_timeout_exception& ex) {
return write_mutation_write_timeout_error(stream, ex.code(), ex.what(), ex.consistency, ex.received, ex.block_for, ex.type);
} catch (const exceptions::already_exists_exception& ex) {
return write_already_exists_error(stream, ex.code(), ex.what(), ex.ks_name, ex.cf_name);
} catch (const exceptions::prepared_query_not_found_exception& ex) {
return write_unprepared_error(stream, ex.code(), ex.what(), ex.id);
} catch (const exceptions::cassandra_exception& ex) {
return write_error(stream, ex.code(), ex.what());
} catch (std::exception& ex) {
return write_error(stream, exceptions::exception_code::SERVER_ERROR, ex.what());
} catch (...) {
return write_error(stream, exceptions::exception_code::SERVER_ERROR, "unknown error");
}
});
}
cql_server::connection::connection(cql_server& server, connected_socket&& fd, socket_address addr)
: _server(server)
, _fd(std::move(fd))
, _read_buf(_fd.input())
, _write_buf(_fd.output())
, _client_state(service::client_state::for_external_calls())
{ }
cql_server::connection::~connection()
{
_server._notifier->unregister_connection(this);
}
future<> cql_server::connection::process()
{
return do_until([this] {
return _read_buf.eof();
}, [this] {
return process_request();
}).then_wrapped([this] (future<> f) {
try {
f.get();
return make_ready_future<>();
} catch (const exceptions::cassandra_exception& ex) {
return write_error(0, ex.code(), ex.what());
} catch (std::exception& ex) {
return write_error(0, exceptions::exception_code::SERVER_ERROR, ex.what());
} catch (...) {
return write_error(0, exceptions::exception_code::SERVER_ERROR, "unknown error");
}
}).finally([this] {
return _pending_requests_gate.close().then([this] {
return std::move(_ready_to_respond);
});
});
}
future<> cql_server::connection::process_request() {
return read_frame().then_wrapped([this] (future<std::experimental::optional<cql_binary_frame_v3>>&& v) {
auto maybe_frame = std::get<0>(v.get());
if (!maybe_frame) {
// eof
return make_ready_future<>();
}
auto& f = *maybe_frame;
// FIXME: compression
if (f.flags & 0x01) {
throw std::runtime_error("CQL frame compression is not supported");
}
auto op = f.opcode;
auto stream = f.stream;
return _read_buf.read_exactly(f.length).then([this, op, stream] (temporary_buffer<char> buf) {
++_server._requests_served;
++_server._requests_serving;
with_gate(
_pending_requests_gate,
[this, op, stream, buf = std::move(buf)] () mutable {
return process_request_one(std::move(buf), op, stream);
}
);
return make_ready_future<>();
});
});
}
future<> cql_server::connection::process_startup(uint16_t stream, temporary_buffer<char> buf)
{
/*auto string_map =*/ read_string_map(buf);
return write_ready(stream);
}
future<> cql_server::connection::process_auth_response(uint16_t stream, temporary_buffer<char> buf)
{
assert(0);
return make_ready_future<>();
}
future<> cql_server::connection::process_options(uint16_t stream, temporary_buffer<char> buf)
{
return write_supported(stream);
}
cql_query_state& cql_server::connection::get_query_state(uint16_t stream)
{
auto i = _query_states.find(stream);
if (i == _query_states.end()) {
i = _query_states.emplace(stream, _client_state).first;
}
return i->second;
}
void
cql_server::connection::init_serialization_format() {
if (_version < 3) {
_serialization_format = serialization_format::use_16_bit();
} else {
_serialization_format = serialization_format::use_32_bit();
}
}
future<> cql_server::connection::process_query(uint16_t stream, temporary_buffer<char> buf)
{
auto query = read_long_string_view(buf);
auto& q_state = get_query_state(stream);
q_state.options = read_options(buf);
return _server._query_processor.local().process(query, q_state.query_state, *q_state.options).then([this, stream] (auto msg) {
return this->write_result(stream, msg);
});
}
future<> cql_server::connection::process_prepare(uint16_t stream, temporary_buffer<char> buf)
{
auto query = read_long_string_view(buf).to_string();
auto cpu_id = engine().cpu_id();
auto cpus = boost::irange(0u, smp::count);
return parallel_for_each(cpus.begin(), cpus.end(), [this, query, cpu_id, stream] (unsigned int c) mutable {
if (c != cpu_id) {
return smp::submit_to(c, [this, query, stream] () mutable {
auto& q_state = get_query_state(stream); // FIXME: is this safe?
_server._query_processor.local().prepare(query, q_state.query_state);
// FIXME: error handling
});
} else {
return make_ready_future<>();
}
}).then([this, query, stream] {
auto& q_state = get_query_state(stream);
return _server._query_processor.local().prepare(query, q_state.query_state).then([this, stream] (auto msg) {
return this->write_result(stream, msg);
});
});
}
future<> cql_server::connection::process_execute(uint16_t stream, temporary_buffer<char> buf)
{
auto id = read_short_bytes(buf);
auto prepared = _server._query_processor.local().get_prepared(id);
if (!prepared) {
throw exceptions::prepared_query_not_found_exception(id);
}
auto& q_state = get_query_state(stream);
auto& query_state = q_state.query_state;
q_state.options = read_options(buf);
auto& options = *q_state.options;
options.prepare(prepared->bound_names);
auto stmt = prepared->statement;
if (stmt->get_bound_terms() != options.get_values_count()) {
throw exceptions::invalid_request_exception("Invalid amount of bind variables");
}
return _server._query_processor.local().process_statement(stmt, query_state, options).then([this, stream] (auto msg) {
return this->write_result(stream, msg);
});
}
future<> cql_server::connection::process_batch(uint16_t stream, temporary_buffer<char> buf)
{
assert(0);
return make_ready_future<>();
}
future<> cql_server::connection::process_register(uint16_t stream, temporary_buffer<char> buf)
{
std::vector<sstring> event_types;
read_string_list(buf, event_types);
for (auto&& event_type : event_types) {
auto et = parse_event_type(event_type);
_server._notifier->register_event(et, this);
}
return write_ready(stream);
}
future<> cql_server::connection::write_unavailable_error(int16_t stream, exceptions::exception_code err, sstring msg, db::consistency_level cl, int32_t required, int32_t alive)
{
auto response = make_shared<cql_server::response>(stream, cql_binary_opcode::ERROR);
response->write_int(static_cast<int32_t>(err));
response->write_string(msg);
response->write_consistency(cl);
response->write_int(required);
response->write_int(alive);
return write_response(response);
}
future<> cql_server::connection::write_read_timeout_error(int16_t stream, exceptions::exception_code err, sstring msg, db::consistency_level cl, int32_t received, int32_t blockfor, bool data_present)
{
auto response = make_shared<cql_server::response>(stream, cql_binary_opcode::ERROR);
response->write_int(static_cast<int32_t>(err));
response->write_string(msg);
response->write_consistency(cl);
response->write_int(received);
response->write_int(blockfor);
response->write_byte(data_present);
return write_response(response);
}
future<> cql_server::connection::write_mutation_write_timeout_error(int16_t stream, exceptions::exception_code err, sstring msg, db::consistency_level cl, int32_t received, int32_t blockfor, db::write_type type)
{
auto response = make_shared<cql_server::response>(stream, cql_binary_opcode::ERROR);
response->write_int(static_cast<int32_t>(err));
response->write_string(msg);
response->write_consistency(cl);
response->write_int(received);
response->write_int(blockfor);
response->write_string(sprint("%s", type));
return write_response(response);
}
future<> cql_server::connection::write_already_exists_error(int16_t stream, exceptions::exception_code err, sstring msg, sstring ks_name, sstring cf_name)
{
auto response = make_shared<cql_server::response>(stream, cql_binary_opcode::ERROR);
response->write_int(static_cast<int32_t>(err));
response->write_string(msg);
response->write_string(ks_name);
response->write_string(cf_name);
return write_response(response);
}
future<> cql_server::connection::write_unprepared_error(int16_t stream, exceptions::exception_code err, sstring msg, bytes id)
{
auto response = make_shared<cql_server::response>(stream, cql_binary_opcode::ERROR);
response->write_int(static_cast<int32_t>(err));
response->write_string(msg);
response->write_short_bytes(id);
return write_response(response);
}
future<> cql_server::connection::write_error(int16_t stream, exceptions::exception_code err, sstring msg)
{
auto response = make_shared<cql_server::response>(stream, cql_binary_opcode::ERROR);
response->write_int(static_cast<int32_t>(err));
response->write_string(msg);
return write_response(response);
}
future<> cql_server::connection::write_ready(int16_t stream)
{
auto response = make_shared<cql_server::response>(stream, cql_binary_opcode::READY);
return write_response(response);
}
future<> cql_server::connection::write_supported(int16_t stream)
{
std::multimap<sstring, sstring> opts;
opts.insert({"CQL_VERSION", cql3::query_processor::CQL_VERSION});
opts.insert({"COMPRESSION", "snappy"});
auto response = make_shared<cql_server::response>(stream, cql_binary_opcode::SUPPORTED);
response->write_string_multimap(opts);
return write_response(response);
}
class cql_server::fmt_visitor : public messages::result_message::visitor {
private:
uint8_t _version;
shared_ptr<cql_server::response> _response;
public:
fmt_visitor(uint8_t version, shared_ptr<cql_server::response> response)
: _version{version}
, _response{response}
{ }
virtual void visit(const messages::result_message::void_message&) override {
_response->write_int(0x0001);
}
virtual void visit(const messages::result_message::set_keyspace& m) override {
_response->write_int(0x0003);
_response->write_string(m.get_keyspace());
}
virtual void visit(const messages::result_message::prepared& m) override {
auto prepared = m.get_prepared();
_response->write_int(0x0004);
_response->write_short_bytes(m.get_id());
// FIXME: not compatible with v4
assert(_version < 4);
cql3::metadata metadata{prepared->bound_names};
_response->write(metadata);
if (_version > 1) {
cql3::metadata result_metadata{std::vector<::shared_ptr<cql3::column_specification>>{}};
result_metadata.set_skip_metadata();
_response->write(result_metadata);
}
}
virtual void visit(const messages::result_message::schema_change& m) override {
auto change = m.get_change();
switch (change->type) {
case event::event_type::SCHEMA_CHANGE: {
auto sc = static_pointer_cast<event::schema_change>(change);
_response->write_int(0x0005);
_response->write_string(to_string(sc->change));
_response->write_string(to_string(sc->target));
_response->write_string(sc->keyspace);
if (sc->target != event::schema_change::target_type::KEYSPACE) {
_response->write_string(sc->table_or_type_or_function.value());
}
break;
}
default:
assert(0);
}
}
virtual void visit(const messages::result_message::rows& m) override {
_response->write_int(0x0002);
auto& rs = m.rs();
_response->write(rs.get_metadata());
_response->write_int(rs.size());
for (auto&& row : rs.rows()) {
for (auto&& cell : row | boost::adaptors::sliced(0, rs.get_metadata().column_count())) {
_response->write_value(cell);
}
}
}
};
future<> cql_server::connection::write_result(int16_t stream, shared_ptr<messages::result_message> msg)
{
auto response = make_shared<cql_server::response>(stream, cql_binary_opcode::RESULT);
fmt_visitor fmt{_version, response};
msg->accept(fmt);
return write_response(response);
}
future<> cql_server::connection::write_topology_change_event(const event::topology_change& event)
{
auto response = make_shared<cql_server::response>(-1, cql_binary_opcode::EVENT);
response->write_string("TOPOLOGY_CHANGE");
response->write_string(to_string(event.change));
response->write_inet(event.node);
return write_response(response);
}
future<> cql_server::connection::write_status_change_event(const event::status_change& event)
{
auto response = make_shared<cql_server::response>(-1, cql_binary_opcode::EVENT);
response->write_string("STATUS_CHANGE");
response->write_string(to_string(event.status));
response->write_inet(event.node);
return write_response(response);
}
future<> cql_server::connection::write_schema_change_event(const event::schema_change& event)
{
auto response = make_shared<cql_server::response>(-1, cql_binary_opcode::EVENT);
response->write_string("SCHEMA_CHANGE");
response->write_string(to_string(event.change));
response->write_string(to_string(event.target));
response->write_string(event.keyspace);
if (event.target != event::schema_change::target_type::KEYSPACE) {
response->write_string(*(event.table_or_type_or_function));
}
return write_response(response);
}
future<> cql_server::connection::write_response(shared_ptr<cql_server::response> response)
{
auto msg = response->make_message(_version);
_ready_to_respond = _ready_to_respond.then([this, msg = std::move(msg)] () mutable {
return _write_buf.write(std::move(msg)).then([this] {
return _write_buf.flush();
});
});
return make_ready_future<>();
}
void cql_server::connection::check_room(temporary_buffer<char>& buf, size_t n)
{
if (buf.size() < n) {
throw exceptions::protocol_exception("truncated frame");
}
}
void cql_server::connection::validate_utf8(sstring_view s)
{
try {
boost::locale::conv::utf_to_utf<char>(s.begin(), s.end(), boost::locale::conv::stop);
} catch (const boost::locale::conv::conversion_error& ex) {
throw exceptions::protocol_exception("Cannot decode string as UTF8");
}
}
int8_t cql_server::connection::read_byte(temporary_buffer<char>& buf)
{
check_room(buf, 1);
int8_t n = buf[0];
buf.trim_front(1);
return n;
}
int32_t cql_server::connection::read_int(temporary_buffer<char>& buf)
{
check_room(buf, sizeof(int32_t));
auto p = reinterpret_cast<const uint8_t*>(buf.begin());
uint32_t n = (static_cast<uint32_t>(p[0]) << 24)
| (static_cast<uint32_t>(p[1]) << 16)
| (static_cast<uint32_t>(p[2]) << 8)
| (static_cast<uint32_t>(p[3]));
buf.trim_front(4);
return n;
}
int64_t cql_server::connection::read_long(temporary_buffer<char>& buf)
{
check_room(buf, sizeof(int64_t));
auto p = reinterpret_cast<const uint8_t*>(buf.begin());
uint64_t n = (static_cast<uint64_t>(p[0]) << 56)
| (static_cast<uint64_t>(p[1]) << 48)
| (static_cast<uint64_t>(p[2]) << 40)
| (static_cast<uint64_t>(p[3]) << 32)
| (static_cast<uint64_t>(p[4]) << 24)
| (static_cast<uint64_t>(p[5]) << 16)
| (static_cast<uint64_t>(p[6]) << 8)
| (static_cast<uint64_t>(p[7]));
buf.trim_front(8);
return n;
}
int16_t cql_server::connection::read_short(temporary_buffer<char>& buf)
{
return static_cast<int16_t>(read_unsigned_short(buf));
}
uint16_t cql_server::connection::read_unsigned_short(temporary_buffer<char>& buf)
{
check_room(buf, sizeof(uint16_t));
auto p = reinterpret_cast<const uint8_t*>(buf.begin());
uint16_t n = (static_cast<uint16_t>(p[0]) << 8)
| (static_cast<uint16_t>(p[1]));
buf.trim_front(2);
return n;
}
bytes cql_server::connection::read_short_bytes(temporary_buffer<char>& buf)
{
auto n = read_short(buf);
check_room(buf, n);
bytes s{reinterpret_cast<const int8_t*>(buf.begin()), static_cast<size_t>(n)};
assert(n >= 0);
buf.trim_front(n);
return s;
}
sstring cql_server::connection::read_string(temporary_buffer<char>& buf)
{
auto n = read_short(buf);
check_room(buf, n);
sstring s{buf.begin(), static_cast<size_t>(n)};
assert(n >= 0);
buf.trim_front(n);
validate_utf8(s);
return s;
}
sstring_view cql_server::connection::read_long_string_view(temporary_buffer<char>& buf)
{
auto n = read_int(buf);
check_room(buf, n);
sstring_view s{buf.begin(), static_cast<size_t>(n)};
buf.trim_front(n);
validate_utf8(s);
return s;
}
db::consistency_level cql_server::connection::read_consistency(temporary_buffer<char>& buf)
{
return wire_to_consistency(read_short(buf));
}
std::unordered_map<sstring, sstring> cql_server::connection::read_string_map(temporary_buffer<char>& buf)
{
std::unordered_map<sstring, sstring> string_map;
auto n = read_short(buf);
for (auto i = 0; i < n; i++) {
auto key = read_string(buf);
auto val = read_string(buf);
string_map.emplace(std::piecewise_construct,
std::forward_as_tuple(std::move(key)),
std::forward_as_tuple(std::move(val)));
}
return string_map;
}
enum class options_flag {
VALUES,
SKIP_METADATA,
PAGE_SIZE,
PAGING_STATE,
SERIAL_CONSISTENCY,
TIMESTAMP,
NAMES_FOR_VALUES
};
using options_flag_enum = super_enum<options_flag,
options_flag::VALUES,
options_flag::SKIP_METADATA,
options_flag::PAGE_SIZE,
options_flag::PAGING_STATE,
options_flag::SERIAL_CONSISTENCY,
options_flag::TIMESTAMP,
options_flag::NAMES_FOR_VALUES
>;
std::unique_ptr<cql3::query_options> cql_server::connection::read_options(temporary_buffer<char>& buf)
{
auto consistency = read_consistency(buf);
if (_version == 1) {
return std::make_unique<cql3::query_options>(consistency, std::experimental::nullopt, std::vector<bytes_opt>{},
false, cql3::query_options::specific_options::DEFAULT, 1, _serialization_format);
}
assert(_version >= 2);
auto flags = enum_set<options_flag_enum>::from_mask(read_byte(buf));
std::vector<bytes_opt> values;
std::vector<sstring> names;
if (flags.contains<options_flag::VALUES>()) {
if (flags.contains<options_flag::NAMES_FOR_VALUES>()) {
read_name_and_value_list(buf, names, values);
} else {
read_value_list(buf, values);
}
}
bool skip_metadata = flags.contains<options_flag::SKIP_METADATA>();
flags.remove<options_flag::VALUES>();
flags.remove<options_flag::SKIP_METADATA>();
std::unique_ptr<cql3::query_options> options;
if (flags) {
::shared_ptr<service::pager::paging_state> paging_state;
int32_t page_size = flags.contains<options_flag::PAGE_SIZE>() ? read_int(buf) : -1;
if (flags.contains<options_flag::PAGING_STATE>()) {
fail(unimplemented::cause::PAGING);
#if 0
paging_state = PagingState.deserialize(CBUtil.readValue(body))
#endif
}
db::consistency_level serial_consistency = db::consistency_level::SERIAL;
if (flags.contains<options_flag::SERIAL_CONSISTENCY>()) {
serial_consistency = read_consistency(buf);
}
api::timestamp_type ts = api::missing_timestamp;
if (flags.contains<options_flag::TIMESTAMP>()) {
ts = read_long(buf);
if (ts < api::min_timestamp || ts > api::max_timestamp) {
throw exceptions::protocol_exception(sprint("Out of bound timestamp, must be in [%d, %d] (got %d)",
api::min_timestamp, api::max_timestamp, ts));
}
}
std::experimental::optional<std::vector<sstring>> onames;
if (!names.empty()) {
onames = std::move(names);
}
options = std::make_unique<cql3::query_options>(consistency, std::move(onames), std::move(values), skip_metadata,
cql3::query_options::specific_options{page_size, std::move(paging_state), serial_consistency, ts}, _version,
_serialization_format);
} else {
options = std::make_unique<cql3::query_options>(consistency, std::experimental::nullopt, std::move(values), skip_metadata,
cql3::query_options::specific_options::DEFAULT, _version, _serialization_format);
}
return std::move(options);
}
void cql_server::connection::read_name_and_value_list(temporary_buffer<char>& buf, std::vector<sstring>& names, std::vector<bytes_opt>& values) {
uint16_t size = read_unsigned_short(buf);
names.reserve(size);
values.reserve(size);
for (uint16_t i = 0; i < size; i++) {
names.emplace_back(read_string(buf));
values.emplace_back(read_value(buf));
}
}
void cql_server::connection::read_string_list(temporary_buffer<char>& buf, std::vector<sstring>& strings) {
uint16_t size = read_unsigned_short(buf);
strings.reserve(size);
for (uint16_t i = 0; i < size; i++) {
strings.emplace_back(read_string(buf));
}
}
void cql_server::connection::read_value_list(temporary_buffer<char>& buf, std::vector<bytes_opt>& values) {
uint16_t size = read_unsigned_short(buf);
values.reserve(size);
for (uint16_t i = 0; i < size; i++) {
values.emplace_back(read_value(buf));
}
}
bytes_opt cql_server::connection::read_value(temporary_buffer<char>& buf) {
auto len = read_int(buf);
if (len < 0) {
return {};
}
check_room(buf, len);
bytes b(reinterpret_cast<const int8_t*>(buf.begin()), len);
buf.trim_front(len);
return {std::move(b)};
}
scattered_message<char> cql_server::response::make_message(uint8_t version) {
scattered_message<char> msg;
sstring body{_body.data(), _body.size()};
sstring frame = make_frame(version, body.size());
msg.append(std::move(frame));
msg.append(std::move(body));
return msg;
}
sstring cql_server::response::make_frame(uint8_t version, size_t length)
{
switch (version) {
case 0x01:
case 0x02: {
sstring frame_buf(sstring::initialized_later(), sizeof(cql_binary_frame_v1));
auto* frame = reinterpret_cast<cql_binary_frame_v1*>(frame_buf.begin());
frame->version = version | 0x80;
frame->flags = 0x00;
frame->stream = _stream;
frame->opcode = static_cast<uint8_t>(_opcode);
frame->length = htonl(length);
return frame_buf;
}
case 0x03:
case 0x04: {
sstring frame_buf(sstring::initialized_later(), sizeof(cql_binary_frame_v3));
auto* frame = reinterpret_cast<cql_binary_frame_v3*>(frame_buf.begin());
frame->version = version | 0x80;
frame->flags = 0x00;
frame->stream = htons(_stream);
frame->opcode = static_cast<uint8_t>(_opcode);
frame->length = htonl(length);
return frame_buf;
}
default:
throw exceptions::protocol_exception(sprint("Invalid or unsupported protocol version: %d", version));
}
}
void cql_server::response::write_byte(uint8_t b)
{
_body.insert(_body.end(), b);
}
void cql_server::response::write_int(int32_t n)
{
auto u = htonl(n);
auto *s = reinterpret_cast<const char*>(&u);
_body.insert(_body.end(), s, s+sizeof(u));
}
void cql_server::response::write_long(int64_t n)
{
auto u = htonq(n);
auto *s = reinterpret_cast<const char*>(&u);
_body.insert(_body.end(), s, s+sizeof(u));
}
void cql_server::response::write_short(int16_t n)
{
auto u = htons(n);
auto *s = reinterpret_cast<const char*>(&u);
_body.insert(_body.end(), s, s+sizeof(u));
}
void cql_server::response::write_string(const sstring& s)
{
assert(s.size() < std::numeric_limits<int16_t>::max());
write_short(s.size());
_body.insert(_body.end(), s.begin(), s.end());
}
void cql_server::response::write_long_string(const sstring& s)
{
assert(s.size() < std::numeric_limits<int32_t>::max());
write_int(s.size());
_body.insert(_body.end(), s.begin(), s.end());
}
void cql_server::response::write_uuid(utils::UUID uuid)
{
// FIXME
assert(0);
}
void cql_server::response::write_string_list(std::vector<sstring> string_list)
{
assert(string_list.size() < std::numeric_limits<int16_t>::max());
write_short(string_list.size());
for (auto&& s : string_list) {
write_string(s);
}
}
void cql_server::response::write_bytes(bytes b)
{
assert(b.size() < std::numeric_limits<int32_t>::max());
write_int(b.size());
_body.insert(_body.end(), b.begin(), b.end());
}
void cql_server::response::write_short_bytes(bytes b)
{
assert(b.size() < std::numeric_limits<int16_t>::max());
write_short(b.size());
_body.insert(_body.end(), b.begin(), b.end());
}
void cql_server::response::write_option(std::pair<int16_t, boost::any> opt)
{
// FIXME
assert(0);
}
void cql_server::response::write_option_list(std::vector<std::pair<int16_t, boost::any>> opt_list)
{
// FIXME
assert(0);
}
void cql_server::response::write_inet(ipv4_addr inet)
{
write_byte(4);
write_byte(((inet.ip & 0xff000000) >> 24));
write_byte(((inet.ip & 0x00ff0000) >> 16));
write_byte(((inet.ip & 0x0000ff00) >> 8 ));
write_byte(((inet.ip & 0x000000ff) ));
write_int(inet.port);
}
void cql_server::response::write_consistency(db::consistency_level c)
{
write_short(consistency_to_wire(c));
}
void cql_server::response::write_string_map(std::map<sstring, sstring> string_map)
{
assert(string_map.size() < std::numeric_limits<int16_t>::max());
write_short(string_map.size());
for (auto&& s : string_map) {
write_string(s.first);
write_string(s.second);
}
}
void cql_server::response::write_string_multimap(std::multimap<sstring, sstring> string_map)
{
std::vector<sstring> keys;
for (auto it = string_map.begin(), end = string_map.end(); it != end; it = string_map.upper_bound(it->first)) {
keys.push_back(it->first);
}
assert(keys.size() < std::numeric_limits<int16_t>::max());
write_short(keys.size());
for (auto&& key : keys) {
std::vector<sstring> values;
auto range = string_map.equal_range(key);
for (auto it = range.first; it != range.second; ++it) {
values.push_back(it->second);
}
write_string(key);
write_string_list(values);
}
}
void cql_server::response::write_value(bytes_opt value)
{
if (!value) {
write_int(-1);
return;
}
write_int(value->size());
_body.insert(_body.end(), value->begin(), value->end());
}
class type_codec {
private:
enum class type_id : int16_t {
CUSTOM = 0,
ASCII,
BIGINT,
BLOB,
BOOLEAN,
COUNTER,
DECIMAL,
DOUBLE,
FLOAT,
INT,
TEXT,
TIMESTAMP,
UUID,
VARCHAR,
VARINT,
TIMEUUID,
INET,
LIST = 32,
MAP,
SET,
UDT = 48,
TUPLE
};
using type_id_to_type_type = boost::bimap<
boost::bimaps::unordered_set_of<type_id>,
boost::bimaps::unordered_set_of<data_type>>;
static thread_local const type_id_to_type_type type_id_to_type;
public:
static void encode(cql_server::response& r, data_type type) {
type = type->underlying_type();
// For compatibility sake, we still return DateType as the timestamp type in resultSet metadata (#5723)
if (type == date_type) {
type = timestamp_type;
}
auto i = type_id_to_type.right.find(type);
if (i != type_id_to_type.right.end()) {
r.write_short(static_cast<std::underlying_type<type_id>::type>(i->second));
return;
}
if (type->is_reversed()) {
fail(unimplemented::cause::REVERSED);
}
if (type->is_tuple()) {
r.write_short(uint16_t(type_id::TUPLE));
auto ttype = static_pointer_cast<const tuple_type_impl>(type);
r.write_short(ttype->size());
for (auto&& t : ttype->all_types()) {
encode(r, t);
}
return;
}
if (type->is_collection()) {
auto&& ctype = static_cast<const collection_type_impl*>(type.get());
if (&ctype->_kind == &collection_type_impl::kind::map) {
r.write_short(uint16_t(type_id::MAP));
auto&& mtype = static_cast<const map_type_impl*>(ctype);
encode(r, mtype->get_keys_type());
encode(r, mtype->get_values_type());
} else if (&ctype->_kind == &collection_type_impl::kind::set) {
r.write_short(uint16_t(type_id::SET));
auto&& stype = static_cast<const set_type_impl*>(ctype);
encode(r, stype->get_elements_type());
} else if (&ctype->_kind == &collection_type_impl::kind::list) {
r.write_short(uint16_t(type_id::LIST));
auto&& ltype = static_cast<const list_type_impl*>(ctype);
encode(r, ltype->get_elements_type());
} else {
abort();
}
return;
}
abort();
}
};
thread_local const type_codec::type_id_to_type_type type_codec::type_id_to_type = boost::assign::list_of<type_id_to_type_type::relation>
(type_id::ASCII , ascii_type)
(type_id::BIGINT , long_type)
(type_id::BLOB , bytes_type)
(type_id::BOOLEAN , boolean_type)
//(type_id::COUNTER , CounterColumn_type)
//(type_id::DECIMAL , Decimal_type)
(type_id::DOUBLE , double_type)
(type_id::FLOAT , float_type)
(type_id::INT , int32_type)
(type_id::TEXT , utf8_type)
(type_id::TIMESTAMP , timestamp_type)
(type_id::UUID , uuid_type)
(type_id::VARCHAR , utf8_type)
(type_id::VARINT , varint_type)
(type_id::TIMEUUID , timeuuid_type)
(type_id::INET , inet_addr_type);
void cql_server::response::write(const cql3::metadata& m) {
bool no_metadata = m.flags().contains<cql3::metadata::flag::NO_METADATA>();
bool global_tables_spec = m.flags().contains<cql3::metadata::flag::GLOBAL_TABLES_SPEC>();
bool has_more_pages = m.flags().contains<cql3::metadata::flag::HAS_MORE_PAGES>();
write_int(m.flags().mask());
write_int(m.column_count());
if (has_more_pages) {
write_value(m.paging_state()->serialize());
}
if (no_metadata) {
return;
}
auto names_i = m.get_names().begin();
if (global_tables_spec) {
auto first_spec = *names_i;
write_string(first_spec->ks_name);
write_string(first_spec->cf_name);
}
for (uint32_t i = 0; i < m.column_count(); ++i, ++names_i) {
::shared_ptr<cql3::column_specification> name = *names_i;
if (!global_tables_spec) {
write_string(name->ks_name);
write_string(name->cf_name);
}
write_string(name->name->text());
type_codec::encode(*this, name->type);
};
}
}
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