Remove telnet_input module

Author: vxgmichel

gambaterm/telnet.py

@@ -1,13 +1,11 @@
 from __future__ import annotations
 
-import os
-import re
 import time
 import hashlib
 import asyncio
 import argparse
 import traceback
-from contextlib import AbstractContextManager as ContextManager, nullcontext
+from contextlib import AbstractContextManager as ContextManager
 from pathlib import Path
 from typing import TYPE_CHECKING, Any, Callable, Coroutine
 from concurrent.futures import ThreadPoolExecutor
@@ -24,33 +22,18 @@
 from .main import add_base_arguments, add_optional_arguments, AppConfig
 from .console import Console, GameboyColor
 from .input_getter import BaseInputGetter
-from .keyboard_input import MESSAGE_SUGGESTING_KITTY_SUPPORT
-from .telnet_input import TelnetInputState, read_telnet_input
+from .keyboard_input import (
+    MESSAGE_SUGGESTING_KITTY_SUPPORT,
+    console_input_from_keyboard_protocol_context,
+    is_kitty_keyboard_protocol_supported,
+)
 from .remote_terminal import RemoteTerminal
 from .telnet_app_session import (
     set_tcp_nodelay,
     telnet_to_terminal,
 )
 
 
-class TelnetInputGetter(BaseInputGetter):
-    """Input getter that reads from telnet input state."""
-
-    def __init__(
-        self, console: Console, terminal: RemoteTerminal, state: TelnetInputState
-    ) -> None:
-        super().__init__(console, terminal)
-        self._state = state
-
-    def get_pressed(self) -> set[Console.Input]:
-        for event in self._state.pop_events():
-            self._console.handle_event(event)
-        return self._state.get_input()
-
-    def pop_keystrokes(self) -> list[Keystroke]:
-        return []
-
-
 class NoInputGetter(BaseInputGetter):
     """Input getter that returns no button presses."""
 
@@ -77,7 +60,7 @@ def thread_target(
     console_callback: Callable[[], Console],
     app_config: AppConfig,
     color_mode: ColorMode,
-    input_state: TelnetInputState | None = None,
+    username: str | None,
 ) -> int:
     """Run the emulator in a thread with the given RemoteTerminal."""
     console: Console = console_callback()
@@ -88,18 +71,22 @@ def thread_target(
         ] = console_input_from_file_context(
             console, term, app_config.input_file, app_config.skip_inputs
         )
-    elif input_state is not None:
-        console_input_context = nullcontext(
-            TelnetInputGetter(console, term, input_state)
+    elif is_kitty_keyboard_protocol_supported(term, timeout=3):
+        console_input_context = console_input_from_keyboard_protocol_context(
+            console,
+            term,
         )
     else:
-        console_input_context = nullcontext(NoInputGetter(console, term))
-
-    with console_input_context as get_console_input:
-        try:
-            term.stream.write(term.enter_fullscreen + term.clear + term.hide_cursor)
-            term.stream.flush()
+        message = MESSAGE_SUGGESTING_KITTY_SUPPORT
+        term.stream.write(message)
+        term.stream.flush()
+        print(f"< User `{username}` did not support keyboard protocol")
+        return 1
 
+    try:
+        term.stream.write(term.enter_fullscreen + term.clear + term.hide_cursor)
+        term.stream.flush()
+        with console_input_context as get_console_input:
             run(
                 console,
                 input_getter=get_console_input,
@@ -109,58 +96,17 @@ def thread_target(
                 break_after=app_config.break_after,
                 speed_factor=app_config.speed_factor,
             )
-        except (KeyboardInterrupt, OSError):
-            return 0
-        else:
-            return 0
-        finally:
-            time.sleep(0.1)
-            term.stream.write(term.clear + term.exit_fullscreen + term.normal_cursor)
-            try:
-                term.stream.flush()
-            except BrokenPipeError:
-                pass
-
-
-_KITTY_RESPONSE_RE = re.compile(rb"\x1b\[\?([0-9]*)u")
-
-
-async def _detect_kitty_keyboard(
-    reader: TelnetReader, writer: TelnetWriter, timeout: float = 3.0
-) -> bool:
-    """Check if the telnet client supports the kitty keyboard protocol.
-
-    Must be called before the input reading task starts.
-
-    :param reader: telnetlib3 reader
-    :param writer: telnetlib3 writer
-    :param timeout: seconds to wait for response
-    :returns: ``True`` if the terminal responds to the kitty keyboard query
-    """
-    writer.write(b"\x1b[?u")
-    await writer.drain()
-
-    buf = b""
-    loop = asyncio.get_event_loop()
-    deadline = loop.time() + timeout
-    while True:
-        remaining = deadline - loop.time()
-        if remaining <= 0:
-            break
+    except (KeyboardInterrupt, OSError):
+        return 0
+    else:
+        return 0
+    finally:
+        time.sleep(0.1)
+        term.stream.write(term.clear + term.exit_fullscreen + term.normal_cursor)
         try:
-            chunk = await asyncio.wait_for(
-                reader.read(256),
-                timeout=remaining,
-            )
-            if not chunk:
-                break
-            buf += chunk if isinstance(chunk, bytes) else chunk.encode("latin-1")
-            if _KITTY_RESPONSE_RE.search(buf):
-                return True
-        except asyncio.TimeoutError:
-            break
-
-    return False
+            term.stream.flush()
+        except BrokenPipeError:
+            pass
 
 
 ShellCallback = Callable[["TelnetReader", "TelnetWriter"], Coroutine[Any, Any, None]]
@@ -313,25 +259,6 @@ async def _telnet_shell(
     # Set TCP_NODELAY to disable Nagle's algorithm for paced output
     set_tcp_nodelay(writer)
 
-    # Require kitty keyboard protocol (must be checked before input task starts)
-    if getattr(app_config, "input_file", None) is None:
-        if not await _detect_kitty_keyboard(reader, writer):
-            print(
-                f"< Telnet client {peer_host} does not support "
-                f"kitty keyboard protocol"
-            )
-            msg = MESSAGE_SUGGESTING_KITTY_SUPPORT.replace("\n", "\r\n")
-            writer.write(msg.encode("utf-8"))
-            await writer.drain()
-            return 1
-
-    # Create input pipe for Ctrl+C/D forwarding
-    input_read_fd, input_write_fd = os.pipe()
-
-    state = TelnetInputState()
-    input_task = asyncio.create_task(
-        read_telnet_input(reader, writer, state, input_write_fd)
-    )
     stats_task = asyncio.create_task(
         _log_connection_stats(writer, peer_host, peer_port)
     )
@@ -361,33 +288,20 @@ async def _telnet_shell(
         config = AppConfig(**vars(namespace))
 
         def target(term: RemoteTerminal) -> int:
-            return thread_target(term, console_callback, config, color_mode, state)
+            return thread_target(term, console_callback, config, color_mode, username)
 
         return await telnet_to_terminal(
+            reader,
             writer,
             executor,
             target,
-            input_read_fd,
         )
     finally:
-        input_task.cancel()
         stats_task.cancel()
-        try:
-            await input_task
-        except asyncio.CancelledError:
-            pass
         try:
             await stats_task
         except asyncio.CancelledError:
             pass
-        try:
-            os.close(input_write_fd)
-        except OSError:
-            pass
-        try:
-            os.close(input_read_fd)
-        except OSError:
-            pass
 
 
 async def run_server(

gambaterm/telnet_app_session.py

@@ -12,6 +12,7 @@
 
 if TYPE_CHECKING:
     from telnetlib3.stream_writer import TelnetWriter
+    from telnetlib3.stream_reader import TelnetReader
 
 from .remote_terminal import RemoteTerminal
 
@@ -106,11 +107,30 @@ def on_naws(rows: int, cols: int) -> None:
         writer.set_ext_callback(NAWS, original_on_naws)
 
 
+async def async_reader_to_sync_pipe(reader: TelnetReader, write_fd: int) -> None:
+    loop = asyncio.get_running_loop()
+    pipe_file = os.fdopen(write_fd, "wb", buffering=0)
+    transport, protocol = await loop.connect_write_pipe(
+        lambda: asyncio.streams.FlowControlMixin(), pipe_file
+    )
+    writer = asyncio.StreamWriter(transport, protocol, None, loop)
+
+    try:
+        while True:
+            data = await reader.read(4096)
+            if not data:
+                break
+            writer.write(data)
+            await writer.drain()
+    finally:
+        writer.close()
+
+
 async def telnet_to_terminal(
+    reader: TelnetReader,
     writer: TelnetWriter,
     executor: ThreadPoolExecutor,
     target: Callable[[RemoteTerminal], T],
-    input_read_fd: int,
 ) -> T:
     """Create a RemoteTerminal and run *target* in a thread executor.
 
@@ -125,29 +145,40 @@ async def telnet_to_terminal(
     cols = writer.get_extra_info("cols") or 80
     rows = writer.get_extra_info("rows") or 24
 
-    read_fd, write_fd = os.pipe()
+    forward_read_fd, forward_write_fd = os.pipe()
     forward_task: asyncio.Task[None] | None = None
 
+    input_read_fd, input_write_fd = os.pipe()
+    input_task: asyncio.Task[None] | None = None
+
     def _target() -> T:
-        with open(write_fd, "w", newline="\r\n") as stream:
-            telnet_term = RemoteTerminal(
-                stream=stream,
-                keyboard_fd=input_read_fd,
-                rows=rows,
-                columns=cols,
-            )
-            with bind_resize_telnet(writer, telnet_term):
-                return target(telnet_term)
+        try:
+            with open(forward_write_fd, "w", newline="\r\n") as stream:
+                telnet_term = RemoteTerminal(
+                    stream=stream,
+                    keyboard_fd=input_read_fd,
+                    rows=rows,
+                    columns=cols,
+                )
+                with bind_resize_telnet(writer, telnet_term):
+                    return target(telnet_term)
+        finally:
+            os.close(input_read_fd)
 
     loop = asyncio.get_running_loop()
-    forward_task = asyncio.create_task(paced_forward_output(read_fd, writer))
+    forward_task = asyncio.create_task(paced_forward_output(forward_read_fd, writer))
+    input_task = asyncio.create_task(async_reader_to_sync_pipe(reader, input_write_fd))
     try:
         return await loop.run_in_executor(executor, _target)
     finally:
         # write_fd is closed by open(write_fd, "w").__exit__ in _target,
         # so forward_task will see EOF. Just wait for it to finish.
-        if forward_task is not None:
-            try:
-                await asyncio.wait_for(forward_task, timeout=2.0)
-            except asyncio.TimeoutError:
-                forward_task.cancel()
+        try:
+            await asyncio.wait_for(forward_task, timeout=2.0)
+        except asyncio.TimeoutError:
+            forward_task.cancel()
+        try:
+            input_task.cancel()
+            await asyncio.wait_for(input_task, timeout=2.0)
+        except (asyncio.TimeoutError, asyncio.CancelledError):
+            pass