496 lines
12 KiB
C++
496 lines
12 KiB
C++
#include "remote.hh"
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#include "display_buffer.hh"
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#include "debug.hh"
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#include "client_manager.hh"
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#include "event_manager.hh"
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#include "buffer_manager.hh"
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#include "command_manager.hh"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <fcntl.h>
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namespace Kakoune
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{
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enum class RemoteUIMsg
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{
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PrintStatus,
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MenuShow,
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MenuSelect,
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MenuHide,
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InfoShow,
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InfoHide,
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Draw
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};
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struct socket_error{};
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class Message
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{
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public:
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Message(int sock) : m_socket(sock) {}
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~Message()
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{
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if (m_stream.size() == 0)
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return;
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int res = ::write(m_socket, m_stream.data(), m_stream.size());
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if (res == 0)
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throw peer_disconnected{};
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}
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void write(const char* val, size_t size)
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{
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m_stream.insert(m_stream.end(), val, val + size);
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}
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template<typename T>
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void write(const T& val)
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{
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write((const char*)&val, sizeof(val));
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};
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void write(const String& str)
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{
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write(str.length());
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write(str.c_str(), (int)str.length());
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};
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template<typename T>
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void write(const memoryview<T>& view)
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{
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write<uint32_t>(view.size());
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for (auto& val : view)
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write(val);
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};
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template<typename T>
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void write(const std::vector<T>& vec)
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{
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write(memoryview<T>(vec));
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}
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void write(const DisplayAtom& atom)
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{
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write(atom.colors.first);
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write(atom.colors.second);
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write(atom.attribute);
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write(atom.content.content());
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}
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void write(const DisplayLine& line)
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{
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write(line.atoms());
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}
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void write(const DisplayBuffer& display_buffer)
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{
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write(display_buffer.lines());
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}
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private:
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std::vector<char> m_stream;
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int m_socket;
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};
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void read(int socket, char* buffer, size_t size)
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{
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while (size)
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{
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int res = ::read(socket, buffer, size);
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if (res == 0)
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throw peer_disconnected{};
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if (res < 0)
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throw socket_error{};
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buffer += res;
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size -= res;
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}
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}
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template<typename T>
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T read(int socket)
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{
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char value[sizeof(T)];
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read(socket, value, sizeof(T));
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return *(T*)(value);
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};
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template<>
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String read<String>(int socket)
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{
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ByteCount length = read<ByteCount>(socket);
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if (length == 0)
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return String{};
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char buffer[2048];
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assert(length < 2048);
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read(socket, buffer, (int)length);
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return String(buffer, buffer+(int)length);
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};
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template<typename T>
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std::vector<T> read_vector(int socket)
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{
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uint32_t size = read<uint32_t>(socket);
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std::vector<T> res;
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res.reserve(size);
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while (size--)
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res.push_back(read<T>(socket));
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return res;
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};
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template<>
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DisplayAtom read<DisplayAtom>(int socket)
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{
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Color fg_color = read<Color>(socket);
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Color bg_color = read<Color>(socket);
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Attribute attribute = read<Attribute>(socket);
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DisplayAtom atom(AtomContent(read<String>(socket)));
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atom.colors = { fg_color, bg_color };
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atom.attribute = attribute;
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return atom;
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}
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template<>
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DisplayLine read<DisplayLine>(int socket)
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{
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return DisplayLine(0, read_vector<DisplayAtom>(socket));
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}
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template<>
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DisplayBuffer read<DisplayBuffer>(int socket)
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{
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DisplayBuffer db;
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db.lines() = read_vector<DisplayLine>(socket);
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return db;
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}
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class RemoteUI : public UserInterface
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{
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public:
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RemoteUI(int socket);
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~RemoteUI();
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void print_status(const String& status, CharCount cursor_pos) override;
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void menu_show(const memoryview<String>& choices,
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const DisplayCoord& anchor, MenuStyle style) override;
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void menu_select(int selected) override;
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void menu_hide() override;
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void info_show(const String& content,
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const DisplayCoord& anchor, MenuStyle style) override;
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void info_hide() override;
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void draw(const DisplayBuffer& display_buffer,
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const String& mode_line) override;
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bool is_key_available() override;
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Key get_key() override;
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DisplayCoord dimensions() override;
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void set_input_callback(InputCallback callback) override;
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private:
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FDWatcher m_socket_watcher;
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DisplayCoord m_dimensions;
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InputCallback m_input_callback;
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};
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RemoteUI::RemoteUI(int socket)
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: m_socket_watcher(socket, [this](FDWatcher&) { if (m_input_callback) m_input_callback(); })
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{
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write_debug("remote client connected: " + int_to_str(m_socket_watcher.fd()));
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}
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RemoteUI::~RemoteUI()
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{
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write_debug("remote client disconnected: " + int_to_str(m_socket_watcher.fd()));
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close(m_socket_watcher.fd());
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}
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void RemoteUI::print_status(const String& status, CharCount cursor_pos)
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{
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Message msg(m_socket_watcher.fd());
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msg.write(RemoteUIMsg::PrintStatus);
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msg.write(status);
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msg.write(cursor_pos);
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}
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void RemoteUI::menu_show(const memoryview<String>& choices,
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const DisplayCoord& anchor, MenuStyle style)
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{
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Message msg(m_socket_watcher.fd());
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msg.write(RemoteUIMsg::MenuShow);
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msg.write(choices);
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msg.write(anchor);
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msg.write(style);
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}
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void RemoteUI::menu_select(int selected)
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{
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Message msg(m_socket_watcher.fd());
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msg.write(RemoteUIMsg::MenuSelect);
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msg.write(selected);
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}
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void RemoteUI::menu_hide()
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{
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Message msg(m_socket_watcher.fd());
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msg.write(RemoteUIMsg::MenuHide);
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}
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void RemoteUI::info_show(const String& content,
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const DisplayCoord& anchor, MenuStyle style)
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{
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Message msg(m_socket_watcher.fd());
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msg.write(RemoteUIMsg::InfoShow);
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msg.write(content);
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msg.write(anchor);
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msg.write(style);
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}
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void RemoteUI::info_hide()
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{
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Message msg(m_socket_watcher.fd());
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msg.write(RemoteUIMsg::InfoHide);
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}
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void RemoteUI::draw(const DisplayBuffer& display_buffer,
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const String& mode_line)
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{
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Message msg(m_socket_watcher.fd());
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msg.write(RemoteUIMsg::Draw);
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msg.write(display_buffer);
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msg.write(mode_line);
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}
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static const Key::Modifiers resize_modifier = (Key::Modifiers)0x80;
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bool RemoteUI::is_key_available()
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{
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timeval tv;
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fd_set rfds;
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int sock = m_socket_watcher.fd();
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FD_ZERO(&rfds);
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FD_SET(sock, &rfds);
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tv.tv_sec = 0;
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tv.tv_usec = 0;
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int res = select(sock+1, &rfds, NULL, NULL, &tv);
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return res == 1;
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}
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Key RemoteUI::get_key()
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{
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Key key = read<Key>(m_socket_watcher.fd());
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if (key.modifiers == resize_modifier)
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{
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m_dimensions = { (int)(key.key >> 16), (int)(key.key & 0xFFFF) };
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return Key::Invalid;
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}
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return key;
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}
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DisplayCoord RemoteUI::dimensions()
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{
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return m_dimensions;
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}
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void RemoteUI::set_input_callback(InputCallback callback)
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{
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m_input_callback = std::move(callback);
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}
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RemoteClient::RemoteClient(int socket, std::unique_ptr<UserInterface>&& ui,
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const String& init_command)
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: m_ui(std::move(ui)), m_dimensions(m_ui->dimensions()),
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m_socket_watcher{socket, [this](FDWatcher&){ process_next_message(); }}
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{
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Message msg(socket);
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msg.write(init_command.c_str(), (int)init_command.length()+1);
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Key key{ resize_modifier, Codepoint(((int)m_dimensions.line << 16) | (int)m_dimensions.column) };
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msg.write(key);
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m_ui->set_input_callback([this]{ write_next_key(); });
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}
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void RemoteClient::process_next_message()
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{
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int socket = m_socket_watcher.fd();
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RemoteUIMsg msg = read<RemoteUIMsg>(socket);
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switch (msg)
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{
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case RemoteUIMsg::PrintStatus:
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{
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auto status = read<String>(socket);
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auto cursor_pos = read<CharCount>(socket);
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m_ui->print_status(status, cursor_pos);
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break;
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}
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case RemoteUIMsg::MenuShow:
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{
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auto choices = read_vector<String>(socket);
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auto anchor = read<DisplayCoord>(socket);
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auto style = read<MenuStyle>(socket);
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m_ui->menu_show(choices, anchor, style);
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break;
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}
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case RemoteUIMsg::MenuSelect:
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m_ui->menu_select(read<int>(socket));
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break;
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case RemoteUIMsg::MenuHide:
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m_ui->menu_hide();
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break;
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case RemoteUIMsg::InfoShow:
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{
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auto choices = read<String>(socket);
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auto anchor = read<DisplayCoord>(socket);
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auto style = read<MenuStyle>(socket);
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m_ui->info_show(choices, anchor, style);
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break;
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}
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case RemoteUIMsg::InfoHide:
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m_ui->info_hide();
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break;
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case RemoteUIMsg::Draw:
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{
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DisplayBuffer display_buffer = read<DisplayBuffer>(socket);
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String mode_line = read<String>(socket);
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m_ui->draw(display_buffer, mode_line);
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break;
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}
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}
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}
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void RemoteClient::write_next_key()
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{
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Message msg(m_socket_watcher.fd());
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// do that before checking dimensions as get_key may
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// handle a resize event.
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msg.write(m_ui->get_key());
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DisplayCoord dimensions = m_ui->dimensions();
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if (dimensions != m_dimensions)
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{
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m_dimensions = dimensions;
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Key key{ resize_modifier, Codepoint(((int)dimensions.line << 16) | (int)dimensions.column) };
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msg.write(key);
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}
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}
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std::unique_ptr<RemoteClient> connect_to(const String& pid, std::unique_ptr<UserInterface>&& ui,
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const String& init_command)
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{
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auto filename = "/tmp/kak-" + pid;
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int sock = socket(AF_UNIX, SOCK_STREAM, 0);
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fcntl(sock, F_SETFD, FD_CLOEXEC);
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sockaddr_un addr;
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addr.sun_family = AF_UNIX;
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strncpy(addr.sun_path, filename.c_str(), sizeof(addr.sun_path) - 1);
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if (connect(sock, (sockaddr*)&addr, sizeof(addr.sun_path)) == -1)
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throw runtime_error("connect to " + filename + " failed");
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return std::unique_ptr<RemoteClient>{new RemoteClient{sock, std::move(ui), init_command}};
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}
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// A client accepter handle a connection until it closes or a nul byte is
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// recieved. Everything recieved before is considered to be a command.
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//
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// * When a nul byte is recieved, the socket is handed to a new Client along
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// with the command.
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// * When the connection is closed, the command is run in an empty context.
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class ClientAccepter
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{
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public:
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ClientAccepter(int socket)
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: m_socket_watcher(socket, [this](FDWatcher&) { handle_available_input(); }) {}
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private:
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void handle_available_input()
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{
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int socket = m_socket_watcher.fd();
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timeval tv{ 0, 0 };
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fd_set rfds;
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do
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{
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char c;
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int res = ::read(socket, &c, 1);
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if (res <= 0)
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{
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if (not m_buffer.empty()) try
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{
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Context context{};
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CommandManager::instance().execute(m_buffer, context);
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}
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catch (runtime_error& e)
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{
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write_debug("error running command '" + m_buffer + "' : " + e.description());
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}
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delete this;
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return;
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}
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if (c == 0) // end of initial command stream, go to interactive ui mode
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{
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ClientManager::instance().create_client(
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std::unique_ptr<UserInterface>{new RemoteUI{socket}}, m_buffer);
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delete this;
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return;
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}
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else
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m_buffer += c;
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FD_ZERO(&rfds);
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FD_SET(socket, &rfds);
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}
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while (select(socket+1, &rfds, NULL, NULL, &tv) == 1);
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}
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String m_buffer;
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FDWatcher m_socket_watcher;
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};
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Server::Server()
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: m_filename{"/tmp/kak-" + int_to_str(getpid())}
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{
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int listen_sock = socket(AF_UNIX, SOCK_STREAM, 0);
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fcntl(listen_sock, F_SETFD, FD_CLOEXEC);
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sockaddr_un addr;
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addr.sun_family = AF_UNIX;
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strncpy(addr.sun_path, m_filename.c_str(), sizeof(addr.sun_path) - 1);
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if (bind(listen_sock, (sockaddr*) &addr, sizeof(sockaddr_un)) == -1)
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throw runtime_error("unable to bind listen socket " + m_filename);
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if (listen(listen_sock, 4) == -1)
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throw runtime_error("unable to listen on socket " + m_filename);
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auto accepter = [](FDWatcher& watcher) {
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sockaddr_un client_addr;
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socklen_t client_addr_len = sizeof(sockaddr_un);
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int sock = accept(watcher.fd(), (sockaddr*) &client_addr, &client_addr_len);
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if (sock == -1)
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throw runtime_error("accept failed");
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fcntl(sock, F_SETFD, FD_CLOEXEC);
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new ClientAccepter{sock};
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};
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m_listener.reset(new FDWatcher{listen_sock, accepter});
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}
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Server::~Server()
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{
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unlink(m_filename.c_str());
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close(m_listener->fd());
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}
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}
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