Revert "Support async predictors (#2010)" (#2022)

This reverts commit a86adcd.

python/cog/server/eventtypes.py

@@ -5,12 +5,6 @@
 
 # From worker parent process
 #
-@define
-class Cancel:
-    # TODO: identify which prediction!
-    pass
-
-
 @define
 class PredictionInput:
     payload: Dict[str, Any]

python/cog/server/helpers.py

@@ -10,7 +10,7 @@
 import threading
 import uuid
 from types import TracebackType
-from typing import Any, BinaryIO, Callable, Dict, List, Sequence, TextIO, Union
+from typing import Any, Callable, Dict, List, Sequence, TextIO, Union
 
 import pydantic
 from typing_extensions import Self
@@ -19,45 +19,6 @@
 from .errors import CogRuntimeError, CogTimeoutError
 
 
-class _SimpleStreamWrapper(io.TextIOWrapper):
-    """
-    _SimpleStreamWrapper wraps a binary I/O buffer and provides a TextIOWrapper
-    interface (primarily write and flush methods) which call a provided
-    callback function instead of (or, if `tee` is True, in addition to) writing
-    to the underlying buffer.
-    """
-
-    def __init__(
-        self,
-        buffer: BinaryIO,
-        callback: Callable[[str, str], None],
-        tee: bool = False,
-    ) -> None:
-        super().__init__(buffer, line_buffering=True)
-
-        self._callback = callback
-        self._tee = tee
-        self._buffer = []
-
-    def write(self, s: str) -> int:
-        length = len(s)
-        self._buffer.append(s)
-        if self._tee:
-            super().write(s)
-        else:
-            # If we're not teeing, we have to handle automatic flush on
-            # newline. When `tee` is true, this is handled by the write method.
-            if "\n" in s or "\r" in s:
-                self.flush()
-        return length
-
-    def flush(self) -> None:
-        self._callback(self.name, "".join(self._buffer))
-        self._buffer.clear()
-        if self._tee:
-            super().flush()
-
-
 class _StreamWrapper:
     def __init__(self, name: str, stream: TextIO) -> None:
         self.name = name
@@ -125,66 +86,6 @@ def original(self) -> TextIO:
         return self._original_fp
 
 
-if sys.version_info < (3, 9):
-
-    class _AsyncStreamRedirectorBase(contextlib.AbstractContextManager):
-        pass
-else:
-
-    class _AsyncStreamRedirectorBase(
-        contextlib.AbstractContextManager["AsyncStreamRedirector"]
-    ):
-        pass
-
-
-class AsyncStreamRedirector(_AsyncStreamRedirectorBase):
-    """
-    AsyncStreamRedirector is a context manager that redirects I/O streams to a
-    callback function. If `tee` is True, it also writes output to the original
-    streams.
-
-    Unlike StreamRedirector, the underlying stream file descriptors are not
-    modified, which means that only stream writes from Python code will be
-    captured. Writes from native code will not be captured.
-
-    Unlike StreamRedirector, the streams redirected cannot be configured. The
-    context manager is only able to redirect STDOUT and STDERR.
-    """
-
-    def __init__(
-        self,
-        callback: Callable[[str, str], None],
-        tee: bool = False,
-    ) -> None:
-        self._callback = callback
-        self._tee = tee
-
-        stdout_wrapper = _SimpleStreamWrapper(sys.stdout.buffer, callback, tee)
-        stderr_wrapper = _SimpleStreamWrapper(sys.stderr.buffer, callback, tee)
-        self._stdout_ctx = contextlib.redirect_stdout(stdout_wrapper)
-        self._stderr_ctx = contextlib.redirect_stderr(stderr_wrapper)
-
-    def __enter__(self) -> Self:
-        self._stdout_ctx.__enter__()
-        self._stderr_ctx.__enter__()
-        return self
-
-    def __exit__(
-        self,
-        exc_type: type[BaseException] | None,
-        exc_value: BaseException | None,
-        traceback: TracebackType | None,
-    ) -> None:
-        self._stdout_ctx.__exit__(exc_type, exc_value, traceback)
-        self._stderr_ctx.__exit__(exc_type, exc_value, traceback)
-
-    def drain(self, timeout: float = 0.0) -> None:
-        # Draining isn't complicated for AsyncStreamRedirector, since we're not
-        # moving data between threads. We just need to flush the streams.
-        sys.stdout.flush()
-        sys.stderr.flush()
-
-
 if sys.version_info < (3, 9):
 
     class _StreamRedirectorBase(contextlib.AbstractContextManager):