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connection_base.hpp
/* Copyright (c) 2018-2024 Marcelo Zimbres Silva (mzimbres@gmail.com)
*
* Distributed under the Boost Software License, Version 1.0. (See
* accompanying file LICENSE.txt)
*/
#ifndef BOOST_REDIS_CONNECTION_BASE_HPP
#define BOOST_REDIS_CONNECTION_BASE_HPP
#include <boost/redis/adapter/adapt.hpp>
#include <boost/redis/detail/helper.hpp>
#include <boost/redis/error.hpp>
#include <boost/redis/operation.hpp>
#include <boost/redis/request.hpp>
#include <boost/redis/resp3/type.hpp>
#include <boost/redis/config.hpp>
#include <boost/redis/detail/runner.hpp>
#include <boost/redis/usage.hpp>
#include <boost/system.hpp>
#include <boost/asio/basic_stream_socket.hpp>
#include <boost/asio/bind_executor.hpp>
#include <boost/asio/experimental/parallel_group.hpp>
#include <boost/asio/ip/tcp.hpp>
#include <boost/asio/steady_timer.hpp>
#include <boost/asio/write.hpp>
#include <boost/assert.hpp>
#include <boost/core/ignore_unused.hpp>
#include <boost/asio/ssl/stream.hpp>
#include <boost/asio/read_until.hpp>
#include <boost/asio/buffer.hpp>
#include <boost/asio/experimental/channel.hpp>
#include <algorithm>
#include <array>
#include <chrono>
#include <deque>
#include <memory>
#include <string_view>
#include <type_traits>
#include <functional>
namespace boost::redis::detail
{
template <class DynamicBuffer>
std::string_view buffer_view(DynamicBuffer buf) noexcept
{
char const* start = static_cast<char const*>(buf.data(0, buf.size()).data());
return std::string_view{start, std::size(buf)};
}
template <class AsyncReadStream, class DynamicBuffer>
class append_some_op {
private:
AsyncReadStream& stream_;
DynamicBuffer buf_;
std::size_t size_ = 0;
std::size_t tmp_ = 0;
asio::coroutine coro_{};
public:
append_some_op(AsyncReadStream& stream, DynamicBuffer buf, std::size_t size)
: stream_ {stream}
, buf_ {std::move(buf)}
, size_{size}
{ }
template <class Self>
void operator()( Self& self
, system::error_code ec = {}
, std::size_t n = 0)
{
BOOST_ASIO_CORO_REENTER (coro_)
{
tmp_ = buf_.size();
buf_.grow(size_);
BOOST_ASIO_CORO_YIELD
stream_.async_read_some(buf_.data(tmp_, size_), std::move(self));
if (ec) {
self.complete(ec, 0);
return;
}
buf_.shrink(buf_.size() - tmp_ - n);
self.complete({}, n);
}
}
};
template <class AsyncReadStream, class DynamicBuffer, class CompletionToken>
auto
async_append_some(
AsyncReadStream& stream,
DynamicBuffer buffer,
std::size_t size,
CompletionToken&& token)
{
return asio::async_compose
< CompletionToken
, void(system::error_code, std::size_t)
>(append_some_op<AsyncReadStream, DynamicBuffer> {stream, buffer, size}, token, stream);
}
template <class Conn>
struct exec_op {
using req_info_type = typename Conn::req_info;
using adapter_type = typename Conn::adapter_type;
Conn* conn_ = nullptr;
std::shared_ptr<req_info_type> info_ = nullptr;
asio::coroutine coro{};
template <class Self>
void operator()(Self& self , system::error_code = {}, std::size_t = 0)
{
BOOST_ASIO_CORO_REENTER (coro)
{
// Check whether the user wants to wait for the connection to
// be stablished.
if (info_->req_->get_config().cancel_if_not_connected && !conn_->is_open()) {
BOOST_ASIO_CORO_YIELD
asio::post(std::move(self));
return self.complete(error::not_connected, 0);
}
conn_->add_request_info(info_);
EXEC_OP_WAIT:
BOOST_ASIO_CORO_YIELD
info_->async_wait(std::move(self));
if (info_->ec_) {
self.complete(info_->ec_, 0);
return;
}
if (info_->stop_requested()) {
// Don't have to call remove_request as it has already
// been by cancel(exec).
return self.complete(asio::error::operation_aborted, 0);
}
if (is_cancelled(self)) {
if (!info_->is_waiting()) {
using c_t = asio::cancellation_type;
auto const c = self.get_cancellation_state().cancelled();
if ((c & c_t::terminal) != c_t::none) {
// Cancellation requires closing the connection
// otherwise it stays in inconsistent state.
conn_->cancel(operation::run);
return self.complete(asio::error::operation_aborted, 0);
} else {
// Can't implement other cancelation types, ignoring.
self.get_cancellation_state().clear();
// TODO: Find out a better way to ignore
// cancelation.
goto EXEC_OP_WAIT;
}
} else {
// Cancelation can be honored.
conn_->remove_request(info_);
self.complete(asio::error::operation_aborted, 0);
return;
}
}
self.complete(info_->ec_, info_->read_size_);
}
}
};
template <class Conn, class Logger>
struct run_op {
Conn* conn = nullptr;
Logger logger_;
asio::coroutine coro{};
template <class Self>
void operator()( Self& self
, std::array<std::size_t, 2> order = {}
, system::error_code ec0 = {}
, system::error_code ec1 = {})
{
BOOST_ASIO_CORO_REENTER (coro)
{
conn->reset();
BOOST_ASIO_CORO_YIELD
asio::experimental::make_parallel_group(
[this](auto token) { return conn->reader(logger_, token);},
[this](auto token) { return conn->writer(logger_, token);}
).async_wait(
asio::experimental::wait_for_one(),
std::move(self));
if (is_cancelled(self)) {
logger_.trace("run-op: canceled. Exiting ...");
self.complete(asio::error::operation_aborted);
return;
}
logger_.on_run(ec0, ec1);
switch (order[0]) {
case 0: self.complete(ec0); break;
case 1: self.complete(ec1); break;
default: BOOST_ASSERT(false);
}
}
}
};
template <class Conn, class Logger>
struct writer_op {
Conn* conn_;
Logger logger_;
asio::coroutine coro{};
template <class Self>
void operator()( Self& self
, system::error_code ec = {}
, std::size_t n = 0)
{
ignore_unused(n);
BOOST_ASIO_CORO_REENTER (coro) for (;;)
{
while (conn_->coalesce_requests()) {
if (conn_->use_ssl())
BOOST_ASIO_CORO_YIELD asio::async_write(conn_->next_layer(), asio::buffer(conn_->write_buffer_), std::move(self));
else
BOOST_ASIO_CORO_YIELD asio::async_write(conn_->next_layer().next_layer(), asio::buffer(conn_->write_buffer_), std::move(self));
logger_.on_write(ec, conn_->write_buffer_);
if (ec) {
logger_.trace("writer-op: error. Exiting ...");
conn_->cancel(operation::run);
self.complete(ec);
return;
}
if (is_cancelled(self)) {
logger_.trace("writer-op: canceled. Exiting ...");
self.complete(asio::error::operation_aborted);
return;
}
conn_->on_write();
// A socket.close() may have been called while a
// successful write might had already been queued, so we
// have to check here before proceeding.
if (!conn_->is_open()) {
logger_.trace("writer-op: canceled (2). Exiting ...");
self.complete({});
return;
}
}
BOOST_ASIO_CORO_YIELD
conn_->writer_timer_.async_wait(std::move(self));
if (!conn_->is_open() || is_cancelled(self)) {
logger_.trace("writer-op: canceled (3). Exiting ...");
// Notice this is not an error of the op, stoping was
// requested from the outside, so we complete with
// success.
self.complete({});
return;
}
}
}
};
template <class Conn, class Logger>
struct reader_op {
using parse_result = typename Conn::parse_result;
using parse_ret_type = typename Conn::parse_ret_type;
Conn* conn_;
Logger logger_;
parse_ret_type res_{parse_result::resp, 0};
asio::coroutine coro{};
template <class Self>
void operator()( Self& self
, system::error_code ec = {}
, std::size_t n = 0)
{
ignore_unused(n);
BOOST_ASIO_CORO_REENTER (coro) for (;;)
{
// Appends some data to the buffer if necessary.
if ((res_.first == parse_result::needs_more) || std::empty(conn_->read_buffer_)) {
if (conn_->use_ssl()) {
BOOST_ASIO_CORO_YIELD
async_append_some(
conn_->next_layer(),
conn_->dbuf_,
conn_->get_suggested_buffer_growth(),
std::move(self));
} else {
BOOST_ASIO_CORO_YIELD
async_append_some(
conn_->next_layer().next_layer(),
conn_->dbuf_,
conn_->get_suggested_buffer_growth(),
std::move(self));
}
logger_.on_read(ec, n);
// EOF is not treated as error.
if (ec == asio::error::eof) {
logger_.trace("reader-op: EOF received. Exiting ...");
conn_->cancel(operation::run);
return self.complete(ec);
}
// The connection is not viable after an error.
if (ec) {
logger_.trace("reader-op: error. Exiting ...");
conn_->cancel(operation::run);
self.complete(ec);
return;
}
// Somebody might have canceled implicitly or explicitly
// while we were suspended and after queueing so we have to
// check.
if (!conn_->is_open() || is_cancelled(self)) {
logger_.trace("reader-op: canceled. Exiting ...");
self.complete(ec);
return;
}
}
res_ = conn_->on_read(buffer_view(conn_->dbuf_), ec);
if (ec) {
logger_.trace("reader-op: parse error. Exiting ...");
conn_->cancel(operation::run);
self.complete(ec);
return;
}
if (res_.first == parse_result::push) {
if (!conn_->receive_channel_.try_send(ec, res_.second)) {
BOOST_ASIO_CORO_YIELD
conn_->receive_channel_.async_send(ec, res_.second, std::move(self));
}
if (ec) {
logger_.trace("reader-op: error. Exiting ...");
conn_->cancel(operation::run);
self.complete(ec);
return;
}
if (!conn_->is_open() || is_cancelled(self)) {
logger_.trace("reader-op: canceled (2). Exiting ...");
self.complete(asio::error::operation_aborted);
return;
}
}
}
}
};
template <class Executor>
class connection_base {
public:
using executor_type = Executor;
using next_layer_type = asio::ssl::stream<asio::basic_stream_socket<asio::ip::tcp, Executor>>;
using clock_type = std::chrono::steady_clock;
using clock_traits_type = asio::wait_traits<clock_type>;
using timer_type = asio::basic_waitable_timer<clock_type, clock_traits_type, executor_type>;
using this_type = connection_base<Executor>;
connection_base(
executor_type ex,
asio::ssl::context ctx,
std::size_t max_read_size)
: ctx_{std::move(ctx)}
, stream_{std::make_unique<next_layer_type>(ex, ctx_)}
, writer_timer_{ex}
, receive_channel_{ex, 256}
, runner_{ex, {}}
, dbuf_{read_buffer_, max_read_size}
{
set_receive_response(ignore);
writer_timer_.expires_at((std::chrono::steady_clock::time_point::max)());
}
auto const& get_ssl_context() const noexcept
{ return ctx_;}
void reset_stream()
{
stream_ = std::make_unique<next_layer_type>(writer_timer_.get_executor(), ctx_);
}
auto& next_layer() noexcept { return *stream_; }
auto const& next_layer() const noexcept { return *stream_; }
auto get_executor() {return writer_timer_.get_executor();}
void cancel(operation op)
{
runner_.cancel(op);
if (op == operation::all) {
cancel_impl(operation::run);
cancel_impl(operation::receive);
cancel_impl(operation::exec);
return;
}
cancel_impl(op);
}
template <class Response, class CompletionToken>
auto async_exec(request const& req, Response& resp, CompletionToken token)
{
using namespace boost::redis::adapter;
auto f = boost_redis_adapt(resp);
BOOST_ASSERT_MSG(req.get_expected_responses() <= f.get_supported_response_size(), "Request and response have incompatible sizes.");
auto info = std::make_shared<req_info>(req, f, get_executor());
return asio::async_compose
< CompletionToken
, void(system::error_code, std::size_t)
>(exec_op<this_type>{this, info}, token, writer_timer_);
}
template <class Response, class CompletionToken>
[[deprecated("Set the response with set_receive_response and use the other overload.")]]
auto async_receive(Response& response, CompletionToken token)
{
set_receive_response(response);
return receive_channel_.async_receive(std::move(token));
}
template <class CompletionToken>
auto async_receive(CompletionToken token)
{ return receive_channel_.async_receive(std::move(token)); }
std::size_t receive(system::error_code& ec)
{
std::size_t size = 0;
auto f = [&](system::error_code const& ec2, std::size_t n)
{
ec = ec2;
size = n;
};
auto const res = receive_channel_.try_receive(f);
if (ec)
return 0;
if (!res)
ec = error::sync_receive_push_failed;
return size;
}
template <class Logger, class CompletionToken>
auto async_run(config const& cfg, Logger l, CompletionToken token)
{
runner_.set_config(cfg);
l.set_prefix(runner_.get_config().log_prefix);
return runner_.async_run(*this, l, std::move(token));
}
template <class Response>
void set_receive_response(Response& response)
{
using namespace boost::redis::adapter;
auto g = boost_redis_adapt(response);
receive_adapter_ = adapter::detail::make_adapter_wrapper(g);
}
usage get_usage() const noexcept
{ return usage_; }
auto run_is_canceled() const noexcept
{ return cancel_run_called_; }
private:
using receive_channel_type = asio::experimental::channel<executor_type, void(system::error_code, std::size_t)>;
using runner_type = runner<executor_type>;
using adapter_type = std::function<void(std::size_t, resp3::basic_node<std::string_view> const&, system::error_code&)>;
using receiver_adapter_type = std::function<void(resp3::basic_node<std::string_view> const&, system::error_code&)>;
using exec_notifier_type = receive_channel_type;
auto use_ssl() const noexcept
{ return runner_.get_config().use_ssl;}
auto cancel_on_conn_lost() -> std::size_t
{
// Must return false if the request should be removed.
auto cond = [](auto const& ptr)
{
BOOST_ASSERT(ptr != nullptr);
if (ptr->is_waiting()) {
return !ptr->req_->get_config().cancel_on_connection_lost;
} else {
return !ptr->req_->get_config().cancel_if_unresponded;
}
};
auto point = std::stable_partition(std::begin(reqs_), std::end(reqs_), cond);
auto const ret = std::distance(point, std::end(reqs_));
std::for_each(point, std::end(reqs_), [](auto const& ptr) {
ptr->stop();
});
reqs_.erase(point, std::end(reqs_));
std::for_each(std::begin(reqs_), std::end(reqs_), [](auto const& ptr) {
return ptr->mark_waiting();
});
return ret;
}
auto cancel_unwritten_requests() -> std::size_t
{
auto f = [](auto const& ptr)
{
BOOST_ASSERT(ptr != nullptr);
return !ptr->is_waiting();
};
auto point = std::stable_partition(std::begin(reqs_), std::end(reqs_), f);
auto const ret = std::distance(point, std::end(reqs_));
std::for_each(point, std::end(reqs_), [](auto const& ptr) {
ptr->stop();
});
reqs_.erase(point, std::end(reqs_));
return ret;
}
void cancel_impl(operation op)
{
switch (op) {
case operation::exec:
{
cancel_unwritten_requests();
} break;
case operation::run:
{
// Protects the code below from being called more than
// once, see https://github.com/boostorg/redis/issues/181
if (std::exchange(cancel_run_called_, true)) {
return;
}
close();
writer_timer_.cancel();
receive_channel_.cancel();
cancel_on_conn_lost();
} break;
case operation::receive:
{
receive_channel_.cancel();
} break;
default: /* ignore */;
}
}
void on_write()
{
// We have to clear the payload right after writing it to use it
// as a flag that informs there is no ongoing write.
write_buffer_.clear();
// Notice this must come before the for-each below.
cancel_push_requests();
// There is small optimization possible here: traverse only the
// partition of unwritten requests instead of them all.
std::for_each(std::begin(reqs_), std::end(reqs_), [](auto const& ptr) {
BOOST_ASSERT_MSG(ptr != nullptr, "Expects non-null pointer.");
if (ptr->is_staged()) {
ptr->mark_written();
}
});
}
struct req_info {
public:
using node_type = resp3::basic_node<std::string_view>;
using wrapped_adapter_type = std::function<void(node_type const&, system::error_code&)>;
explicit req_info(request const& req, adapter_type adapter, executor_type ex)
: notifier_{ex, 1}
, req_{&req}
, adapter_{}
, expected_responses_{req.get_expected_responses()}
, status_{status::waiting}
, ec_{{}}
, read_size_{0}
{
adapter_ = [this, adapter](node_type const& nd, system::error_code& ec)
{
auto const i = req_->get_expected_responses() - expected_responses_;
adapter(i, nd, ec);
};
}
auto proceed()
{
notifier_.try_send(std::error_code{}, 0);
}
void stop()
{
notifier_.close();
}
[[nodiscard]] auto is_waiting() const noexcept
{ return status_ == status::waiting; }
[[nodiscard]] auto is_written() const noexcept
{ return status_ == status::written; }
[[nodiscard]] auto is_staged() const noexcept
{ return status_ == status::staged; }
void mark_written() noexcept
{ status_ = status::written; }
void mark_staged() noexcept
{ status_ = status::staged; }
void mark_waiting() noexcept
{ status_ = status::waiting; }
[[nodiscard]] auto stop_requested() const noexcept
{ return !notifier_.is_open();}
template <class CompletionToken>
auto async_wait(CompletionToken token)
{
return notifier_.async_receive(std::move(token));
}
//private:
enum class status
{ waiting
, staged
, written
};
exec_notifier_type notifier_;
request const* req_;
wrapped_adapter_type adapter_;
// Contains the number of commands that haven't been read yet.
std::size_t expected_responses_;
status status_;
system::error_code ec_;
std::size_t read_size_;
};
void remove_request(std::shared_ptr<req_info> const& info)
{
reqs_.erase(std::remove(std::begin(reqs_), std::end(reqs_), info));
}
using reqs_type = std::deque<std::shared_ptr<req_info>>;
template <class, class> friend struct reader_op;
template <class, class> friend struct writer_op;
template <class, class> friend struct run_op;
template <class> friend struct exec_op;
template <class, class, class> friend struct runner_op;
void cancel_push_requests()
{
auto point = std::stable_partition(std::begin(reqs_), std::end(reqs_), [](auto const& ptr) {
return !(ptr->is_staged() && ptr->req_->get_expected_responses() == 0);
});
std::for_each(point, std::end(reqs_), [](auto const& ptr) {
ptr->proceed();
});
reqs_.erase(point, std::end(reqs_));
}
[[nodiscard]] bool is_writing() const noexcept
{
return !write_buffer_.empty();
}
void add_request_info(std::shared_ptr<req_info> const& info)
{
reqs_.push_back(info);
if (info->req_->has_hello_priority()) {
auto rend = std::partition_point(std::rbegin(reqs_), std::rend(reqs_), [](auto const& e) {
return e->is_waiting();
});
std::rotate(std::rbegin(reqs_), std::rbegin(reqs_) + 1, rend);
}
if (is_open() && !is_writing())
writer_timer_.cancel();
}
template <class CompletionToken, class Logger>
auto reader(Logger l, CompletionToken&& token)
{
return asio::async_compose
< CompletionToken
, void(system::error_code)
>(reader_op<this_type, Logger>{this, l}, token, writer_timer_);
}
template <class CompletionToken, class Logger>
auto writer(Logger l, CompletionToken&& token)
{
return asio::async_compose
< CompletionToken
, void(system::error_code)
>(writer_op<this_type, Logger>{this, l}, token, writer_timer_);
}
template <class Logger, class CompletionToken>
auto async_run_lean(config const& cfg, Logger l, CompletionToken token)
{
runner_.set_config(cfg);
l.set_prefix(runner_.get_config().log_prefix);
return asio::async_compose
< CompletionToken
, void(system::error_code)
>(run_op<this_type, Logger>{this, l}, token, writer_timer_);
}
[[nodiscard]] bool coalesce_requests()
{
// Coalesces the requests and marks them staged. After a
// successful write staged requests will be marked as written.
auto const point = std::partition_point(std::cbegin(reqs_), std::cend(reqs_), [](auto const& ri) {
return !ri->is_waiting();
});
std::for_each(point, std::cend(reqs_), [this](auto const& ri) {
// Stage the request.
write_buffer_ += ri->req_->payload();
ri->mark_staged();
usage_.commands_sent += ri->expected_responses_;
});
usage_.bytes_sent += std::size(write_buffer_);
return point != std::cend(reqs_);
}
bool is_waiting_response() const noexcept
{
if (std::empty(reqs_))
return false;
// Under load and on low-latency networks we might start
// receiving responses before the write operation completed and
// the request is still maked as staged and not written. See
// https://github.com/boostorg/redis/issues/170
return !reqs_.front()->is_waiting();
}
void close()
{
if (stream_->next_layer().is_open()) {
system::error_code ec;
stream_->next_layer().close(ec);
}
}
auto is_open() const noexcept { return stream_->next_layer().is_open(); }
auto& lowest_layer() noexcept { return stream_->lowest_layer(); }
auto is_next_push()
{
BOOST_ASSERT(!read_buffer_.empty());
// Useful links to understand the heuristics below.
//
// - https://github.com/redis/redis/issues/11784
// - https://github.com/redis/redis/issues/6426
// - https://github.com/boostorg/redis/issues/170
// The message's resp3 type is a push.
if (resp3::to_type(read_buffer_.front()) == resp3::type::push)
return true;
// This is non-push type and the requests queue is empty. I have
// noticed this is possible, for example with -MISCONF. I don't
// know why they are not sent with a push type so we can
// distinguish them from responses to commands. If we are lucky
// enough to receive them when the command queue is empty they
// can be treated as server pushes, otherwise it is impossible
// to handle them properly
if (reqs_.empty())
return true;
// The request does not expect any response but we got one. This
// may happen if for example, subscribe with wrong syntax.
if (reqs_.front()->expected_responses_ == 0)
return true;
// Added to deal with MONITOR and also to fix PR170 which
// happens under load and on low-latency networks, where we
// might start receiving responses before the write operation
// completed and the request is still maked as staged and not
// written.
return reqs_.front()->is_waiting();
}
auto get_suggested_buffer_growth() const noexcept
{
return parser_.get_suggested_buffer_growth(4096);
}
enum class parse_result { needs_more, push, resp };
using parse_ret_type = std::pair<parse_result, std::size_t>;
parse_ret_type on_finish_parsing(parse_result t)
{
if (t == parse_result::push) {
usage_.pushes_received += 1;
usage_.push_bytes_received += parser_.get_consumed();
} else {
usage_.responses_received += 1;
usage_.response_bytes_received += parser_.get_consumed();
}
on_push_ = false;
dbuf_.consume(parser_.get_consumed());
auto const res = std::make_pair(t, parser_.get_consumed());
parser_.reset();
return res;
}
parse_ret_type on_read(std::string_view data, system::error_code& ec)
{
// We arrive here in two states:
//
// 1. While we are parsing a message. In this case we
// don't want to determine the type of the message in the
// buffer (i.e. response vs push) but leave it untouched
// until the parsing of a complete message ends.
//
// 2. On a new message, in which case we have to determine
// whether the next messag is a push or a response.
//
if (!on_push_) // Prepare for new message.
on_push_ = is_next_push();
if (on_push_) {
if (!resp3::parse(parser_, data, receive_adapter_, ec))
return std::make_pair(parse_result::needs_more, 0);
if (ec)
return std::make_pair(parse_result::push, 0);
return on_finish_parsing(parse_result::push);
}
BOOST_ASSERT_MSG(is_waiting_response(), "Not waiting for a response (using MONITOR command perhaps?)");
BOOST_ASSERT(!reqs_.empty());
BOOST_ASSERT(reqs_.front() != nullptr);
BOOST_ASSERT(reqs_.front()->expected_responses_ != 0);
if (!resp3::parse(parser_, data, reqs_.front()->adapter_, ec))
return std::make_pair(parse_result::needs_more, 0);
if (ec) {
reqs_.front()->ec_ = ec;
reqs_.front()->proceed();
return std::make_pair(parse_result::resp, 0);
}
reqs_.front()->read_size_ += parser_.get_consumed();
if (--reqs_.front()->expected_responses_ == 0) {
// Done with this request.
reqs_.front()->proceed();
reqs_.pop_front();
}
return on_finish_parsing(parse_result::resp);
}
void reset()
{
write_buffer_.clear();
read_buffer_.clear();
parser_.reset();
on_push_ = false;
cancel_run_called_ = false;
}
asio::ssl::context ctx_;
std::unique_ptr<next_layer_type> stream_;
// Notice we use a timer to simulate a condition-variable. It is
// also more suitable than a channel and the notify operation does
// not suspend.
timer_type writer_timer_;
receive_channel_type receive_channel_;
runner_type runner_;
receiver_adapter_type receive_adapter_;
using dyn_buffer_type = asio::dynamic_string_buffer<char, std::char_traits<char>, std::allocator<char>>;
std::string read_buffer_;
dyn_buffer_type dbuf_;
std::string write_buffer_;
reqs_type reqs_;
resp3::parser parser_{};
bool on_push_ = false;
bool cancel_run_called_ = false;
usage usage_;
};
} // boost::redis::detail
#endif // BOOST_REDIS_CONNECTION_BASE_HPP
boost::redis::detail::connection_base
Base class for high level Redis asynchronous connections.
Definition: connection_base.hpp:380
boost::redis::detail::connection_base::get_executor
auto get_executor()
Returns the associated executor.
Definition: connection_base.hpp:427
boost::redis::detail::connection_base::reset_stream
void reset_stream()
Resets the underlying stream.
Definition: connection_base.hpp:415
boost::redis::detail::connection_base::next_layer_type
asio::ssl::stream< asio::basic_stream_socket< asio::ip::tcp, Executor > > next_layer_type
Type of the next layer.
Definition: connection_base.hpp:386
boost::redis::detail::connection_base::next_layer
auto & next_layer() noexcept
Returns a reference to the next layer.
Definition: connection_base.hpp:421
boost::redis::detail::connection_base::executor_type
Executor executor_type
Executor type.
Definition: connection_base.hpp:383
boost::redis::detail::connection_base::get_ssl_context
auto const & get_ssl_context() const noexcept
Returns the ssl context.
Definition: connection_base.hpp:411
boost::redis::detail::connection_base::cancel
void cancel(operation op)
Cancels specific operations.
Definition: connection_base.hpp:430
boost::redis::detail::connection_base::next_layer
auto const & next_layer() const noexcept
Returns a const reference to the next layer.
Definition: connection_base.hpp:424
boost::redis::detail::connection_base::connection_base
connection_base(executor_type ex, asio::ssl::context ctx, std::size_t max_read_size)
Constructs from an executor.
Definition: connection_base.hpp:395
boost::redis::request
Creates Redis requests.
Definition: request.hpp:46
boost::redis::ignore
ignore_t ignore
Global ignore object.
boost::redis::response
std::tuple< adapter::result< Ts >... > response
Response with compile-time size.
Definition: response.hpp:25
boost::redis::operation
operation
Connection operations that can be cancelled.
Definition: operation.hpp:18
boost::redis::resp3::type::push
@ push
Aaggregate.
boost::redis::error::sync_receive_push_failed
@ sync_receive_push_failed
Can't receive push synchronously without blocking.
boost::redis::error::not_connected
@ not_connected
There is no stablished connection.
boost::redis::operation::exec
@ exec
Refers to connection::async_exec operations.
boost::redis::operation::all
@ all
Refers to all operations.
boost::redis::operation::run
@ run
Refers to connection::async_run operations.
boost::redis::operation::receive
@ receive
Refers to connection::async_receive operations.
boost::redis::config
Configure parameters used by the connection classes.
Definition: config.hpp:30
boost::redis::usage
Connection usage information.
Definition: usage.hpp:21
boost::redis::resp3::basic_node
A node in the response tree.
Definition: node.hpp:28