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Only write to remote socket when we know they are writable

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Buffer data (in an horribly innefficient way for now), and use the
event manager to watch for the socket being ready for a write.

Fixes #945
This commit is contained in:
Maxime Coste 2016-12-01 20:11:09 +00:00
parent 95c1528342
commit 8c862c4eea
4 changed files with 138 additions and 102 deletions
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10
src/file.cc
View File

@ -143,6 +143,16 @@ bool fd_readable(int fd)
return select(fd+1, &rfds, nullptr, nullptr, &tv) == 1;
}
bool fd_writable(int fd)
{
fd_set rfds;
FD_ZERO(&rfds);
FD_SET(fd, &rfds);
timeval tv{0,0};
return select(fd+1, nullptr, &rfds, nullptr, &tv) == 1;
}
String read_fd(int fd, bool text)
{
String content;

1
src/file.hh
View File

@ -30,6 +30,7 @@ std::pair<StringView, StringView> split_path(StringView path);
String get_kak_binary_path();
bool fd_readable(int fd);
bool fd_writable(int fd);
String read_fd(int fd, bool text = false);
String read_file(StringView filename, bool text = false);
void write(int fd, StringView data);

220
src/remote.cc
View File

@ -42,7 +42,8 @@ enum class MessageType : char
class MsgWriter
{
public:
MsgWriter(int sock, MessageType type) : m_socket(sock)
MsgWriter(RemoteBuffer& buffer, MessageType type)
: m_buffer{buffer}, m_start{(uint32_t)buffer.size()}
{
write(type);
write((uint32_t)0); // message size, to be patched on write
@ -50,23 +51,13 @@ public:
~MsgWriter() noexcept(false)
{
uint32_t count = (uint32_t)m_stream.size();
char* data = m_stream.data();
*reinterpret_cast<uint32_t*>(data+1) = count;
while (count > 0)
{
int res = ::write(m_socket, data, count);
if (res <= 0)
throw remote_error{res ? "peer disconnected"
: format("socket write failed: {}", strerror(errno))};
data += res;
count -= res;
}
uint32_t count = (uint32_t)m_buffer.size() - m_start;
*reinterpret_cast<uint32_t*>(m_buffer.data() + m_start + 1) = count;
}
void write(const char* val, size_t size)
{
m_stream.insert(m_stream.end(), val, val + size);
m_buffer.insert(m_buffer.end(), val, val + size);
}
template<typename T>
@ -139,8 +130,8 @@ public:
}
private:
Vector<char, MemoryDomain::Remote> m_stream;
int m_socket;
RemoteBuffer& m_buffer;
uint32_t m_start;
};
class MsgReader
@ -344,18 +335,34 @@ private:
MsgReader m_reader;
DisplayCoord m_dimensions;
OnKeyCallback m_on_key;
RemoteBuffer m_send_buffer;
SafePtr<Client> m_client;
};
static bool send_data(int fd, RemoteBuffer& buffer)
{
while (buffer.size() > 0 and fd_writable(fd))
{
int res = ::write(fd, buffer.data(), buffer.size());
if (res <= 0)
throw remote_error{res ? "peer disconnected"
: format("socket write failed: {}", strerror(errno))};
buffer.erase(buffer.begin(), buffer.begin() + res);
}
return buffer.empty();
}
RemoteUI::RemoteUI(int socket, DisplayCoord dimensions)
: m_socket_watcher(socket, FdEvents::Read,
[this](FDWatcher& watcher, FdEvents, EventMode mode) {
: m_socket_watcher(socket, FdEvents::Read | FdEvents::Write,
[this](FDWatcher& watcher, FdEvents events, EventMode mode) {
const int sock = watcher.fd();
try
{
while (fd_readable(sock))
if (events & FdEvents::Write and send_data(sock, m_send_buffer))
m_socket_watcher.events() &= ~FdEvents::Write;
while (events & FdEvents::Read and fd_readable(sock))
{
m_reader.read_available(sock);
@ -377,7 +384,7 @@ RemoteUI::RemoteUI(int socket, DisplayCoord dimensions)
}
catch (const remote_error& err)
{
write_to_debug_buffer(format("Error while reading remote message: {}", err.what()));
write_to_debug_buffer(format("Error while transfering remote messages: {}", err.what()));
ClientManager::instance().remove_client(*m_client, false);
}
}),
@ -396,72 +403,81 @@ void RemoteUI::menu_show(ConstArrayView<DisplayLine> choices,
DisplayCoord anchor, Face fg, Face bg,
MenuStyle style)
{
MsgWriter msg{m_socket_watcher.fd(), MessageType::MenuShow};
MsgWriter msg{m_send_buffer, MessageType::MenuShow};
msg.write(choices);
msg.write(anchor);
msg.write(fg);
msg.write(bg);
msg.write(style);
m_socket_watcher.events() |= FdEvents::Write;
}
void RemoteUI::menu_select(int selected)
{
MsgWriter msg{m_socket_watcher.fd(), MessageType::MenuSelect};
MsgWriter msg{m_send_buffer, MessageType::MenuSelect};
msg.write(selected);
m_socket_watcher.events() |= FdEvents::Write;
}
void RemoteUI::menu_hide()
{
MsgWriter msg{m_socket_watcher.fd(), MessageType::MenuHide};
MsgWriter msg{m_send_buffer, MessageType::MenuHide};
m_socket_watcher.events() |= FdEvents::Write;
}
void RemoteUI::info_show(StringView title, StringView content,
DisplayCoord anchor, Face face,
InfoStyle style)
{
MsgWriter msg{m_socket_watcher.fd(), MessageType::InfoShow};
MsgWriter msg{m_send_buffer, MessageType::InfoShow};
msg.write(title);
msg.write(content);
msg.write(anchor);
msg.write(face);
msg.write(style);
m_socket_watcher.events() |= FdEvents::Write;
}
void RemoteUI::info_hide()
{
MsgWriter msg{m_socket_watcher.fd(), MessageType::InfoHide};
MsgWriter msg{m_send_buffer, MessageType::InfoHide};
m_socket_watcher.events() |= FdEvents::Write;
}
void RemoteUI::draw(const DisplayBuffer& display_buffer,
const Face& default_face,
const Face& padding_face)
{
MsgWriter msg{m_socket_watcher.fd(), MessageType::Draw};
MsgWriter msg{m_send_buffer, MessageType::Draw};
msg.write(display_buffer);
msg.write(default_face);
msg.write(padding_face);
m_socket_watcher.events() |= FdEvents::Write;
}
void RemoteUI::draw_status(const DisplayLine& status_line,
const DisplayLine& mode_line,
const Face& default_face)
{
MsgWriter msg{m_socket_watcher.fd(), MessageType::DrawStatus};
MsgWriter msg{m_send_buffer, MessageType::DrawStatus};
msg.write(status_line);
msg.write(mode_line);
msg.write(default_face);
m_socket_watcher.events() |= FdEvents::Write;
}
void RemoteUI::refresh(bool force)
{
MsgWriter msg{m_socket_watcher.fd(), MessageType::Refresh};
MsgWriter msg{m_send_buffer, MessageType::Refresh};
msg.write(force);
m_socket_watcher.events() |= FdEvents::Write;
}
void RemoteUI::set_ui_options(const Options& options)
{
MsgWriter msg{m_socket_watcher.fd(), MessageType::SetOptions};
MsgWriter msg{m_send_buffer, MessageType::SetOptions};
msg.write(options);
m_socket_watcher.events() |= FdEvents::Write;
}
static sockaddr_un session_addr(StringView session)
@ -500,83 +516,90 @@ RemoteClient::RemoteClient(StringView session, std::unique_ptr<UserInterface>&&
int sock = connect_to(session);
{
MsgWriter msg{sock, MessageType::Connect};
MsgWriter msg{m_send_buffer, MessageType::Connect};
msg.write(init_command);
msg.write(m_ui->dimensions());
msg.write(env_vars);
}
m_ui->set_on_key([this](Key key){
MsgWriter msg(m_socket_watcher->fd(), MessageType::Key);
MsgWriter msg(m_send_buffer, MessageType::Key);
msg.write(key);
m_socket_watcher->events() |= FdEvents::Write;
});
MsgReader reader;
m_socket_watcher.reset(new FDWatcher{sock, FdEvents::Read,
[this, reader](FDWatcher& watcher, FdEvents, EventMode) mutable {
m_socket_watcher.reset(new FDWatcher{sock, FdEvents::Read | FdEvents::Write,
[this, reader](FDWatcher& watcher, FdEvents events, EventMode) mutable {
const int sock = watcher.fd();
while (fd_readable(sock) and not reader.ready())
if (events & FdEvents::Write and send_data(sock, m_send_buffer))
m_socket_watcher->events() &= ~FdEvents::Write;
while (events & FdEvents::Read and
not reader.ready() and fd_readable(sock))
{
reader.read_available(sock);
if (not reader.ready())
return;
if (not reader.ready())
continue;
auto clear_reader = on_scope_end([&reader] { reader.reset(); });
switch (reader.type())
{
case MessageType::MenuShow:
{
auto choices = reader.read_vector<DisplayLine>();
auto anchor = reader.read<DisplayCoord>();
auto fg = reader.read<Face>();
auto bg = reader.read<Face>();
auto style = reader.read<MenuStyle>();
m_ui->menu_show(choices, anchor, fg, bg, style);
break;
}
case MessageType::MenuSelect:
m_ui->menu_select(reader.read<int>());
break;
case MessageType::MenuHide:
m_ui->menu_hide();
break;
case MessageType::InfoShow:
{
auto title = reader.read<String>();
auto content = reader.read<String>();
auto anchor = reader.read<DisplayCoord>();
auto face = reader.read<Face>();
auto style = reader.read<InfoStyle>();
m_ui->info_show(title, content, anchor, face, style);
break;
}
case MessageType::InfoHide:
m_ui->info_hide();
break;
case MessageType::Draw:
{
auto display_buffer = reader.read<DisplayBuffer>();
auto default_face = reader.read<Face>();
auto padding_face = reader.read<Face>();
m_ui->draw(display_buffer, default_face, padding_face);
break;
}
case MessageType::DrawStatus:
{
auto status_line = reader.read<DisplayLine>();
auto mode_line = reader.read<DisplayLine>();
auto default_face = reader.read<Face>();
m_ui->draw_status(status_line, mode_line, default_face);
break;
}
case MessageType::Refresh:
m_ui->refresh(reader.read<bool>());
break;
case MessageType::SetOptions:
m_ui->set_ui_options(reader.read_idmap<String, MemoryDomain::Options>());
break;
default:
kak_assert(false);
auto clear_reader = on_scope_end([&reader] { reader.reset(); });
switch (reader.type())
{
case MessageType::MenuShow:
{
auto choices = reader.read_vector<DisplayLine>();
auto anchor = reader.read<DisplayCoord>();
auto fg = reader.read<Face>();
auto bg = reader.read<Face>();
auto style = reader.read<MenuStyle>();
m_ui->menu_show(choices, anchor, fg, bg, style);
break;
}
case MessageType::MenuSelect:
m_ui->menu_select(reader.read<int>());
break;
case MessageType::MenuHide:
m_ui->menu_hide();
break;
case MessageType::InfoShow:
{
auto title = reader.read<String>();
auto content = reader.read<String>();
auto anchor = reader.read<DisplayCoord>();
auto face = reader.read<Face>();
auto style = reader.read<InfoStyle>();
m_ui->info_show(title, content, anchor, face, style);
break;
}
case MessageType::InfoHide:
m_ui->info_hide();
break;
case MessageType::Draw:
{
auto display_buffer = reader.read<DisplayBuffer>();
auto default_face = reader.read<Face>();
auto padding_face = reader.read<Face>();
m_ui->draw(display_buffer, default_face, padding_face);
break;
}
case MessageType::DrawStatus:
{
auto status_line = reader.read<DisplayLine>();
auto mode_line = reader.read<DisplayLine>();
auto default_face = reader.read<Face>();
m_ui->draw_status(status_line, mode_line, default_face);
break;
}
case MessageType::Refresh:
m_ui->refresh(reader.read<bool>());
break;
case MessageType::SetOptions:
m_ui->set_ui_options(reader.read_idmap<String, MemoryDomain::Options>());
break;
default:
kak_assert(false);
}
}
}});
}
@ -585,8 +608,12 @@ void send_command(StringView session, StringView command)
{
int sock = connect_to(session);
auto close_sock = on_scope_end([sock]{ close(sock); });
MsgWriter msg{sock, MessageType::Command};
msg.write(command);
RemoteBuffer buffer;
{
MsgWriter msg{buffer, MessageType::Command};
msg.write(command);
}
write(sock, {buffer.data(), buffer.data() + buffer.size()});
}
@ -613,11 +640,8 @@ private:
const int sock = m_socket_watcher.fd();
try
{
do
{
while (not m_reader.ready() and fd_readable(sock))
m_reader.read_available(sock);
}
while (fd_readable(sock) and not m_reader.ready());
if (not m_reader.ready())
return;

9
src/remote.hh
View File

@ -4,6 +4,7 @@
#include "env_vars.hh"
#include "exception.hh"
#include "utils.hh"
#include "vector.hh"
#include <memory>
@ -12,14 +13,13 @@ namespace Kakoune
struct remote_error : runtime_error
{
remote_error(String error)
: runtime_error{std::move(error)}
{}
using runtime_error::runtime_error;
};
class FDWatcher;
class UserInterface;
struct Key;
using RemoteBuffer = Vector<char, MemoryDomain::Remote>;
// A remote client handle communication between a client running on the server
// and a user interface running on the local process.
@ -32,6 +32,7 @@ public:
private:
std::unique_ptr<UserInterface> m_ui;
std::unique_ptr<FDWatcher> m_socket_watcher;
RemoteBuffer m_send_buffer;
};
void send_command(StringView session, StringView command);